[add] fail fast options

NOTE: CI didn't work without explicitly specifying the branch.

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,23 @@
+#### environment
+
+- vim: ????
+- vim-airline: ????
+- OS: ????
+- Have you reproduced with a minimal vimrc: ???
+- What is your airline configuration: ???
+if you are using terminal:
+- terminal: ????
+- $TERM variable: ???
+- color configuration (:set t_Co?):
+if you are using Neovim:
+- does it happen in Vim: ???
+
+#### actual behavior
+
+????
+
+#### expected behavior
+
+????
+
+#### screen shot (if possible)

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+      - vim9script
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        vim_version:
+        - 'v8.2.1000'
+        - 'v8.2.0000'
+        - 'v8.1.0000'
+        - 'v8.0.0000'
+        - 'v7.4'
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@master
+
+    - name: Setup Ruby
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: '2.6'
+
+    - name: Setup Bundle
+      run: |
+        gem install bundler
+        bundle install --jobs 4 --retry 3
+
+    - name: Setup Vim
+      uses: thinca/action-setup-vim@v1
+      with:
+        vim_version: ${{ matrix.vim_version }}
+
+    - name: Install Dependencies
+      run: | 
+        curl -f -L "https://raw.githubusercontent.com/vim-airline/vim-airline-themes/master/autoload/airline/themes/simple.vim" -o autoload/airline/themes/simple.vim
+        curl -f -L "https://raw.githubusercontent.com/vim-airline/vim-airline-themes/master/autoload/airline/themes/molokai.vim" -o autoload/airline/themes/molokai.vim
+        mkdir colors && curl -f -L 'https://raw.githubusercontent.com/tomasr/molokai/master/colors/molokai.vim' -o colors/molokai.vim
+
+    - name: Run Test
+      run: rake ci

.github/workflows/reviewdog.yml

@@ -0,0 +1,22 @@
+name: reviewdog
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  vint:
+    name: runner / vint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: vint
+        uses: reviewdog/action-vint@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          level: error
+          reporter: github-pr-check

.gitignore

@@ -1 +1,8 @@
+.DS_Store
 doc/tags
+*.lock
+.vim-flavor
+*.swp
+.bundle
+vendor
+

CHANGELOG.md

@@ -0,0 +1,248 @@
+# Change Log
+
+This is the Changelog for the vim-airline project.
+
+## [0.12] - Unreleased
+- New features
+  - Extensions:
+    - [poetv](https://github.com/petobens/poet-v) support
+    - [vim-lsp](https://github.com/prabirshrestha/vim-lsp) support
+    - [zoomwintab](https://github.com/troydm/zoomwintab.vim) support
+    - [Vaffle](https://github.com/cocopon/vaffle.vim) support
+    - [vim-dirvish](https://github.com/justinmk/vim-dirvish) support
+    - [fzf.vim](https://github.com/junegunn/fzf.vim) support
+    - [OmniSharp](https://github.com/OmniSharp/omnisharp-vim) support
+    - [searchcount](https://vim-jp.org/vimdoc-en/eval.html#searchcount())  support
+    - [fern.vim](https://github.com/lambdalisue/fern.vim) support
+    - [Vim-CMake](https://github.com/cdelledonne/vim-cmake) support
+    - [battery.vim](https://github.com/lambdalisue/battery.vim) support
+    - [nvim-lspconfig](https://github.com/neovim/nvim-lspconfig) support
+    - [gen_tags.vim](https://github.com/jsfaint/gen_tags.vim) support
+- Improvements
+  - git branch can also be displayed using [gina.vim](https://github.com/lambdalisue/gina.vim)
+  - coc extensions can also show additional status messages
+  - [coc-git](https://github.com/neoclide/coc-git) extension integrated into hunks extension
+- Other
+  - Introduce Vim script static analysis using [reviewdog](https://github.com/reviewdog/action-vint)
+  - Added multiple Vim versions to unit tests using Travis CI
+  - Added option to show short paths in the status line
+
+## [0.11] - 2019-11-10
+- New features
+  - Extensions:
+    - [Coc](https://github.com/neoclide/coc.nvim) support
+    - [Defx](https://github.com/Shougo/defx.nvim) support
+    - [gina](https://github.com/lambdalisue/gina.vim) support
+    - [vim-bookmark](https://github.com/MattesGroeger/vim-bookmarks) support
+    - [vista.vim](https://github.com/liuchengxu/vista.vim) support
+    - [tabws](https://github.com/s1341/vim-tabws) support for the tabline
+- Improvements
+  - The statusline can be configured to be shown on top (in the tabline)
+    Set the `g:airline_statusline_ontop` to enable this experimental feature.
+  - If `buffer_idx_mode=2`, up to 89 mappings will be exposed to access more
+    buffers directly (issue [#1823](https://github.com/vim-airline/vim-airline/issues/1823))
+  - Allow to use `random` as special theme name, which will switch to a random
+    airline theme (at least if a random number can be generated :()
+  - The branch extensions now also displays whether the repository is in a clean state
+    (will append a ! or ⚡if the repository is considered dirty).
+  - The whitespace extensions will also check for conflict markers
+  - `:AirlineRefresh` command now takes an additional `!` attribute, that **skips** 
+    recreating the highlighting groups (which might have a serious performance
+    impact if done very often, as might be the case when the configuration variable 
+    `airline_skip_empty_sections` is active).
+  - airline can now also detect multiple cursor mode (issue [#1933](https://github.com/vim-airline/vim-airline/issues/1933))
+  - expose hunks output using the function `airline#extensions#hunks#get_raw_hunks()` to the outside [#1877](https://github.com/vim-airline/vim-airline/pull/1877)
+  - expose wordcount affected filetype list to the public using the `airline#extensions#wordcount#filetypes` variable [#1887](https://github.com/vim-airline/vim-airline/pull/1887)
+  - for the `:AirlineExtension` command, indicate whether the extension has been loaded from an external source [#1890](https://github.com/vim-airline/vim-airline/issues/1890)
+  - correctly load custom wordcount formatters [#1896](https://github.com/vim-airline/vim-airline/issues/1896)
+  - add a new short_path formatter for the tabline [#1898](https://github.com/vim-airline/vim-airline/pull/1898)
+  - several improvements to the branch, denite and tabline extension, as well as the async code for Vim and Neovim
+  - the term extension supports [neoterm](https://github.com/kassio/neoterm) vim plugin
+
+## [0.10] - 2018-12-15
+- New features
+  - Extensions:
+    - [LanguageClient](https://github.com/autozimu/LanguageClient-neovim)
+    - [vim-gutentags](https://github.com/ludovicchabant/vim-gutentags)
+    - [vim-localsearch](https://github.com/mox-mox/vim-localsearch)
+    - [xtabline](https://github.com/mg979/vim-xtabline)
+    - [vim-grepper](https://github.com/mhinz/vim-grepper)
+  - Add custom AirlineModeChanged autocommand, allowing to call user defined commands
+    whenever airline displays a different mode
+  - New :AirlineExtensions command, to show which extensions have been loaded
+  - Detect several new modes (e.g. completion, virtual replace, etc)
+- Improvements
+  - Various performance improvements, should Vim keep responsive, even when
+    many highlighting groups need to be re-created
+  - Rework tabline extension
+  - Refactor [vim-ctrlspace](https://github.com/szw/vim-ctrlspace) extension
+  - Refactor the wordcount extension
+  - Reworked the po extension
+  - Allow to disable line numbers for the [Ale Extension](https://github.com/w0rp/ale)
+  - [fugitive](https://github.com/tpope/vim-fugitive) plugin has been refactored
+    causing adjustments for vim-airline, also uses Fugitives new API calls
+  - some improvements to Vims terminal mode
+  - Allow to use alternative seperators for inactive windows ([#1236](https://github.com/vim-airline/vim-airline/issues/1236))
+  - Statusline can be set to inactive, whenever Vim loses focus (using FocusLost autocommand)
+
+## [0.9] - 2018-01-15
+- Changes
+  - Look of default Airline Symbols has been improved [#1397](https://github.com/vim-airline/vim-airline/issues/1397)
+  - Airline does now set `laststatus=2` if needed
+  - Syntastic extension now displays warnings and errors separately
+  - Updates on Resize and SessionLoad events
+  - Add `maxlinenr` symbol to `airline_section_z`
+  - Add quickfix title to inactive windows
+- Improvements
+  - Many performance improvements (using caching and async feature when possible)
+  - Cache changes to highlighting groups if `g:airline_highlighting_cache = 1` is set
+  - Allow to skip empty sections by setting `g:airline_skip_empty_sections` variable
+  - Make use of improved Vim Script API, if available (e.g. getwininfo())
+  - Support for Vims terminal feature (very experimental since it hasn't been stabilized yet)
+  - More configuration for the tabline extension (with clickable buffers for Neovim)
+  - Works better on smaller window sizes
+  - Make airline aware of git worktrees
+  - Improvements to the fugitive extension [#1603](https://github.com/vim-airline/vim-airline/issues/1603)
+  - Allows for configurable fileformat output if `g:airline#parts#ffenc#skip_expected_string` is set
+  - Improvements to the documentation
+- New features
+  - Full async support for Vim 8 and Neovim
+  - Extensions:
+    - [vim-bufmru](https://github.com/mildred/vim-bufmru)
+    - [xkb-switch](https://github.com/ierton/xkb-switch)
+    - [input-source-switcher](https://github.com/vovkasm/input-source-switcher)
+    - [vimagit](https://github.com/jreybert/vimagit)
+    - [denite](https://github.com/Shougo/denite.nvim)
+    - [dein](https://github.com/Shougo/dein.vim)
+    - [vimtex](https://github.com/lervag/vimtex)
+    - [minpac](https://github.com/k-takata/minpac/)
+    - [vim-cursormode](https://github.com/vheon/vim-cursormode)
+    - [Neomake](https://github.com/neomake/neomake)
+    - [Ale](https://github.com/w0rp/ale)
+    - [vim-obsession](https://github.com/tpope/vim-obsession)
+    - spell (can also display Spell language)
+    - keymap
+  - Formatters:
+    - Formatters for JavaScript [#1617](https://github.com/vim-airline/vim-airline/issues/1617)
+    - Tabline: Allow for custom formatter for `tab_nr_type` [#1418](https://github.com/vim-airline/vim-airline/issues/1418)
+    - Customizable wordcount formatter [#1584](https://github.com/vim-airline/vim-airline/issues/1584)
+  - Add User autocommand for Theme changing [#1226](https://github.com/vim-airline/vim-airline/issues/1226)
+  - Shows mercurial mq status if hg mq extension is enabled
+
+## [0.8] - 2016-03-09
+- Changes
+  - Airline converted to an organization and moved to new [repository](https://github.com/vim-airline/vim-airline)
+  - Themes have been split into an separate repository [vim-airline-themes](https://github.com/vim-airline/vim-airline-themes)
+- Improvements
+  - Extensions
+    - branch: support Git and Mercurial simultaneously, untracked files
+    - whitespace: new mixed-indent rule
+  - Windows support
+  - Many bug fixes
+  - Support for Neovim
+- New features
+  - Many new themes
+  - Extensions/integration
+    - [taboo](https://github.com/gcmt/taboo.vim)
+    - [vim-ctrlspace](https://github.com/szw/vim-ctrlspace)
+    - [quickfixsigns](https://github.com/tomtom/quickfixsigns_vim)
+    - [YouCompleteMe](https://github.com/ycm-core/YouCompleteMe)
+    - [po.vim](http://www.vim.org/scripts/script.php?script_id=695)
+    - [unicode.vim](https://github.com/chrisbra/unicode.vim)
+    - wordcount
+    - crypt indicator
+    - byte order mark indicator
+  - Tabline's tab mode can display splits simultaneously
+
+## [0.7] - 2014-12-10
+- New features
+    - accents support; allowing multiple colors/styles in the same section
+    - extensions: eclim
+    - themes: understated, monochrome, murmur, sol, lucius
+- Improvements
+    -  solarized theme; support for 8 color terminals
+    -  tabline resizes dynamically based on number of open buffers
+    -  miscellaneous bug fixes
+
+## [0.6] - 2013-10-08
+
+- New features
+    - accents support; allowing multiple colors/styles in the same section
+    - extensions: eclim
+    - themes: understated, monochrome, murmur, sol, lucius
+- Improvements
+    - solarized theme; support for 8 color terminals
+    - tabline resizes dynamically based on number of open buffers
+    - miscellaneous bug fixes
+
+## [0.5] - 2013-09-13
+
+- New features
+    - smart tabline extension which displays all buffers when only one tab is visible
+    - automatic section truncation when the window resizes
+    - support for a declarative style of configuration, allowing parts to contain metadata such as minimum window width or conditional visibility
+    - themes: zenburn, serene
+- Other
+    - a sizable chunk of vim-airline is now running through a unit testing suite, automated via Travis CI
+
+## [0.4] - 2013-08-26
+
+ - New features
+    - integration with csv.vim and vim-virtualenv
+    - hunks extension for vim-gitgutter and vim-signify
+    - automatic theme switching with matching colorschemes
+    - commands: AirlineToggle
+    - themes: base16 (all variants)
+ - Improvements
+    - integration with undotree, tagbar, and unite
+ - Other
+    - refactored core and exposed statusline builder and pipeline
+    - all extension related g:airline_variables have been deprecated in favor of g:airline#extensions# variables
+    - extensions found in the runtimepath outside of the default distribution will be automatically loaded
+
+## [0.3] - 2013-08-12
+
+-  New features
+    -  first-class integration with tagbar
+    -  white space detection for trailing spaces and mixed indentation
+    -  introduced warning section for syntastic and white space detection
+    -  improved ctrlp integration: colors are automatically selected based on the current airline theme
+    -  new themes: molokai, bubblegum, jellybeans, tomorrow
+-  Bug fixes
+    -  improved handling of eventignore used by other plugins
+-  Other
+    - code cleaned up for clearer separation between core functionality and extensions
+    - introduced color extraction from highlight groups, allowing themes to be generated off of the active colorscheme (e.g. jellybeans and tomorrow)
+    - License changed to MIT
+
+## [0.2] - 2013-07-28
+
+-  New features
+      - iminsert detection
+      - integration with vimshell, vimfiler, commandt, lawrencium
+      - enhanced bufferline theming
+      - support for ctrlp theming
+      - support for custom window excludes
+- New themes
+      - luna and wombat
+- Bug fixes
+      - refresh branch name after switching with a shell command
+
+## [0.1] - 2013-07-17
+
+- Initial release
+  - integration with other plugins: netrw, unite, nerdtree, undotree, gundo, tagbar, minibufexplr, ctrlp
+  - support for themes: 8 included
+
+[0.12]: https://github.com/vim-airline/vim-airline/compare/v0.11...HEAD
+[0.11]: https://github.com/vim-airline/vim-airline/compare/v0.10...v0.11
+[0.10]: https://github.com/vim-airline/vim-airline/compare/v0.9...v0.10
+[0.9]: https://github.com/vim-airline/vim-airline/compare/v0.8...v0.9
+[0.8]: https://github.com/vim-airline/vim-airline/compare/v0.7...v0.8
+[0.7]: https://github.com/vim-airline/vim-airline/compare/v0.6...v0.7
+[0.6]: https://github.com/vim-airline/vim-airline/compare/v0.5...v0.6
+[0.5]: https://github.com/vim-airline/vim-airline/compare/v0.4...v0.5
+[0.4]: https://github.com/vim-airline/vim-airline/compare/v0.3...v0.4
+[0.3]: https://github.com/vim-airline/vim-airline/compare/v0.2...v0.3
+[0.2]: https://github.com/vim-airline/vim-airline/compare/v0.1...v0.2
+[0.1]: https://github.com/vim-airline/vim-airline/releases/tag/v0.1

CONTRIBUTING.md

@@ -0,0 +1,28 @@
+# Contributions
+
+Contributions and pull requests are welcome.  Please take note of the following guidelines:
+
+*  Adhere to the existing style as much as possible; notably, 2 space indents and long-form keywords.
+*  Keep the history clean!  Squash your branches before you submit a pull request.  `pull --rebase` is your friend.
+*  Any changes to the core should be tested against Vim 7.4.
+
+# Bugs
+
+Tracking down bugs can take a very long time due to different configurations, versions, and operating systems.  To ensure a timely response, please help me out by doing the following:
+
+* the `:version` of vim
+* the commit of vim-airline you're using
+* the OS that you're using, including terminal emulator, GUI vs non-GUI
+
+# Themes
+
+*  If you submit a theme, please create a screenshot so it can be added to the [Wiki][14].
+*  In the majority of cases, modifications to colors of existing themes will likely be rejected.  Themes are a subjective thing, so while you may prefer that a particular color be darker, another user will prefer it to be lighter, or something entirely different.  The more popular the theme, the more unlikely the change will be accepted.  However, it's pretty simple to create your own theme; copy the theme to `~/.vim/autoload/airline/themes` under a new name with your modifications, and it can be used.
+
+# Maintenance
+
+If you would like to take a more active role in improving vim-airline, please consider [becoming a maintainer][43].
+
+
+[14]: https://github.com/vim-airline/vim-airline/wiki/Screenshots
+[43]: https://github.com/vim-airline/vim-airline/wiki/Becoming-a-Maintainer

Gemfile

@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'vim-flavor', '~> 2.2.2'

LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (C) 2013-2020 Bailey Ling, Christian Brabandt, et al.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

@@ -1,27 +1,243 @@
-# vim-airline
+# vim-airline [![Build Status](https://travis-ci.org/vim-airline/vim-airline.svg?branch=master)](https://travis-ci.org/vim-airline/vim-airline) [![Say Thanks!](https://img.shields.io/badge/Say%20Thanks-!-1EAEDB.svg)](https://saythanks.io/to/cb%40256bit.org) [![reviewdog](https://github.com/vim-airline/vim-airline/workflows/reviewdog/badge.svg?branch=master&event=push)](https://github.com/vim-airline/vim-airline/actions?query=workflow%3Areviewdog+event%3Apush+branch%3Amaster)
 
-Lean & mean statusline for vim that's light as air.
+Lean & mean status/tabline for vim that's light as air.
 
-![img](https://github.com/bling/vim-airline/wiki/screenshots/light.png)
+![img](https://github.com/vim-airline/vim-airline/wiki/screenshots/demo.gif)
+
+When the plugin is correctly loaded, there will be a nice statusline at the
+bottom of each vim window.
+
+That line consists of several sections, each one displaying some piece of
+information. By default (without configuration) this line will look like this:
+
+```
++-----------------------------------------------------------------------------+
+|~                                                                            |
+|~                                                                            |
+|~                     VIM - Vi IMproved                                      |
+|~                                                                            |
+|~                       version 8.2                                          |
+|~                    by Bram Moolenaar et al.                                |
+|~           Vim is open source and freely distributable                      |
+|~                                                                            |
+|~           type :h :q<Enter>          to exit                               |
+|~           type :help<Enter> or <F1>  for on-line help                      |
+|~           type :help version8<Enter> for version info                      |
+|~                                                                            |
+|~                                                                            |
++-----------------------------------------------------------------------------+
+| A | B |                     C                            X | Y | Z |  [...] |
++-----------------------------------------------------------------------------+
+```
+
+The statusline is the colored line at the bottom, which contains the sections
+(possibly in different colors):
+
+section|meaning (example)
+-------|------------------
+  A    | displays the mode + additional flags like crypt/spell/paste (INSERT)
+  B    | Environment status (VCS information - branch, hunk summary (master), [battery][61] level)
+  C    | filename + read-only flag (~/.vim/vimrc RO)
+  X    | filetype  (vim)
+  Y    | file encoding[fileformat] (utf-8[unix])
+  Z    | current position in the file
+ [...] | additional sections (warning/errors/statistics) from external plugins (e.g. YCM, syntastic, ...)
+
+The information in Section Z looks like this:
+
+`10% ☰ 10/100 ln : 20`
+
+This means:
+```
+10%     - 10 percent down the top of the file
+☰ 10    - current line 10
+/100 ln - of 100 lines
+: 20    - current column 20
+```
+
+For a better look, those sections can be colored differently, depending on various conditions
+(e.g. the mode or whether the current file is 'modified')
+
+# Features
+
+*  Tiny core written with extensibility in mind ([open/closed principle][8]).
+*  Integrates with a variety of plugins, including: [vim-bufferline][6],
+   [fugitive][4], [unite][9], [ctrlp][10], [minibufexpl][15], [gundo][16],
+   [undotree][17], [nerdtree][18], [tagbar][19], [vim-gitgutter][29],
+   [vim-signify][30], [quickfixsigns][39], [syntastic][5], [eclim][34],
+   [lawrencium][21], [virtualenv][31], [tmuxline][35], [taboo.vim][37],
+   [ctrlspace][38], [vim-bufmru][47], [vimagit][50], [denite][51],
+   [vim.battery][61] and more.
+*  Looks good with regular fonts and provides configuration points so you can use unicode or powerline symbols.
+*  Optimized for speed - loads in under a millisecond.
+*  Extensive suite of themes for popular color schemes including [solarized][23] (dark and light), [tomorrow][24] (all variants), [base16][32] (all variants), [molokai][25], [jellybeans][26] and others.
+ Note these are now external to this plugin. More details can be found in the [themes repository][46].
+*  Supports 7.2 as the minimum Vim version.
+*  The master branch tries to be as stable as possible, and new features are merged in only after they have gone through a [full regression test][33].
+*  Unit testing suite.
+
+## Straightforward customization
+
+If you don't like the defaults, you can replace all sections with standard `statusline` syntax.  Give your statusline that you've built over the years a face lift.
+
+![image](https://f.cloud.github.com/assets/306502/1009429/d69306da-0b38-11e3-94bf-7c6e3eef41e9.png)
+
+## Themes
+
+Themes have moved to
+another repository as of [this commit][45].
+
+Install the themes as you would this plugin (Vundle example):
+
+```vim
+Plugin 'vim-airline/vim-airline'
+Plugin 'vim-airline/vim-airline-themes'
+```
+
+See [vim-airline-themes][46] for more.
+
+## Automatic truncation
+
+Sections and parts within sections can be configured to automatically hide when the window size shrinks.
+
+![image](https://f.cloud.github.com/assets/306502/1060831/05c08aac-11bc-11e3-8470-a506a3037f45.png)
+
+## Smarter tab line
+
+Automatically displays all buffers when there's only one tab open.
+
+![tabline](https://f.cloud.github.com/assets/306502/1072623/44c292a0-1495-11e3-9ce6-dcada3f1c536.gif)
+
+This is disabled by default; add the following to your vimrc to enable the extension:
+
+    let g:airline#extensions#tabline#enabled = 1
+
+Separators can be configured independently for the tabline, so here is how you can define "straight" tabs:
+
+    let g:airline#extensions#tabline#left_sep = ' '
+    let g:airline#extensions#tabline#left_alt_sep = '|'
+
+In addition, you can also choose which path formatter airline uses. This affects how file paths are
+displayed in each individual tab as well as the current buffer indicator in the upper right.
+To do so, set the `formatter` field with:
+
+    let g:airline#extensions#tabline#formatter = 'default'
+
+Here is a complete list of formatters with screenshots:
+
+#### `default`
+![image](https://user-images.githubusercontent.com/2652762/34422844-1d005efa-ebe6-11e7-8053-c784c0da7ba7.png)
+
+#### `jsformatter`
+![image](https://user-images.githubusercontent.com/2652762/34422843-1cf6a4d2-ebe6-11e7-810a-07e6eb08de24.png)
+
+#### `unique_tail`
+![image](https://user-images.githubusercontent.com/2652762/34422841-1ce5b4ec-ebe6-11e7-86e9-3d45c876068b.png)
+
+#### `unique_tail_improved`
+![image](https://user-images.githubusercontent.com/2652762/34422842-1cee23f2-ebe6-11e7-962d-97e068873077.png)
+
+## Seamless integration
+
+vim-airline integrates with a variety of plugins out of the box.  These extensions will be lazily loaded if and only if you have the other plugins installed (and of course you can turn them off).
+
+#### [ctrlp.vim][10]
+![image](https://f.cloud.github.com/assets/306502/962258/7345a224-04ec-11e3-8b5a-f11724a47437.png)
+
+#### [unite.vim][9]
+![image](https://f.cloud.github.com/assets/306502/962319/4d7d3a7e-04ed-11e3-9d59-ab29cb310ff8.png)
+
+#### [denite.nvim][51]
+![image](https://cloud.githubusercontent.com/assets/246230/23939717/f65bce6e-099c-11e7-85c3-918dbc839392.png)
+
+#### [tagbar][19]
+![image](https://f.cloud.github.com/assets/306502/962150/7e7bfae6-04ea-11e3-9e28-32af206aed80.png)
+
+#### [csv.vim][28]
+![image](https://f.cloud.github.com/assets/306502/962204/cfc1210a-04eb-11e3-8a93-42e6bcd21efa.png)
+
+#### [syntastic][5]
+![image](https://f.cloud.github.com/assets/306502/962864/9824c484-04f7-11e3-9928-da94f8c7da5a.png)
+
+#### hunks ([vim-gitgutter][29] & [vim-signify][30] & [coc-git][59])
+![image](https://f.cloud.github.com/assets/306502/995185/73fc7054-09b9-11e3-9d45-618406c6ed98.png)
+
+#### [vimagit][50]
+![vim-airline-vimagit-demo](https://cloud.githubusercontent.com/assets/533068/22107273/2ea85ba0-de4d-11e6-9fa8-331103b88df4.gif)
+
+#### [virtualenv][31]
+![image](https://f.cloud.github.com/assets/390964/1022566/cf81f830-0d98-11e3-904f-cf4fe3ce201e.png)
+
+#### [tmuxline][35]
+![image](https://f.cloud.github.com/assets/1532071/1559276/4c28fbac-4fc7-11e3-90ef-7e833d980f98.gif)
+
+#### [promptline][36]
+![airline-promptline-sc](https://f.cloud.github.com/assets/1532071/1871900/7d4b28a0-789d-11e3-90e4-16f37269981b.gif)
+
+#### [ctrlspace][38]
+![papercolor_with_ctrlspace](https://cloud.githubusercontent.com/assets/493242/12912041/7fc3c6ec-cf16-11e5-8775-8492b9c64ebf.png)
+
+#### [xkb-switch][48]/[xkb-layout][49]
+![image](https://cloud.githubusercontent.com/assets/5715281/22061422/347e7842-ddb8-11e6-8bdb-7abbd418653c.gif)
+
+#### [vimtex][53]
+![image](https://cloud.githubusercontent.com/assets/1798172/25799740/e77d5c2e-33ee-11e7-8660-d34ce4c5f13f.png)
+
+#### [localsearch][54]
+![image](https://raw.githubusercontent.com/mox-mox/vim-localsearch/master/vim-airline-localsearch-indicator.png)
+
+#### [LanguageClient][57]
+![image](https://user-images.githubusercontent.com/9622/45275524-52f45c00-b48b-11e8-8b83-a66240b10747.gif)
+
+#### [Vim-CMake][60]
+![image](https://user-images.githubusercontent.com/24732205/87788512-c876a380-c83d-11ea-9ee3-5f639f986a8f.png)
+
+#### [vim.battery][61]
+![image](https://user-images.githubusercontent.com/1969470/94561399-368b0e00-0264-11eb-94a0-f6b67c73d422.png)
+
+## Extras
+
+vim-airline also supplies some supplementary stand-alone extensions.  In addition to the tabline extension mentioned earlier, there is also:
+
+#### whitespace
+![image](https://f.cloud.github.com/assets/306502/962401/2a75385e-04ef-11e3-935c-e3b9f0e954cc.png)
+
+### statusline on top
+The statusline can alternatively be drawn on top, making room for other plugins to use the statusline:
+The example shows a custom statusline setting, that imitates Vims default statusline, while allowing
+to call custom functions.  Use `:let g:airline_statusline_ontop=1` to enable it.
+
+![image](https://i.imgur.com/tW1lMRU.png)
+
+## Configurable and extensible
+
+#### Fine-tuned configuration
+
+Every section is composed of parts, and you can reorder and reconfigure them at will.
+
+![image](https://f.cloud.github.com/assets/306502/1073278/f291dd4c-14a3-11e3-8a83-268e2753f97d.png)
+
+Sections can contain accents, which allows for very granular control of visuals (see configuration [here](https://github.com/vim-airline/vim-airline/issues/299#issuecomment-25772886)).
+
+![image](https://f.cloud.github.com/assets/306502/1195815/4bfa38d0-249d-11e3-823e-773cfc2ca894.png)
+
+#### Extensible pipeline
+
+Completely transform the statusline to your liking.  Build out the statusline as you see fit by extracting colors from the current colorscheme's highlight groups.
+
+![allyourbase](https://f.cloud.github.com/assets/306502/1022714/e150034a-0da7-11e3-94a5-ca9d58a297e8.png)
 
 # Rationale
 
-There's already [powerline][b], why yet another statusline?
+There's already [powerline][2], why yet another statusline?
 
-*  it's 100% vimscript; no python needed.
-*  it's small.  i want the core plugin to be *less than 200 lines* as a rule (specifically adhering to the [open/closed principle][h]).
-*  despite the small size, it is fully featured and already integrates with: [vim-bufferline][f], [fugitive][d], [unite][i], [ctrlp][j], [minibufexpl][o], [gundo][p], [undotree][q], [nerdtree][r], [tagbar][s] and [syntastic][e].
-*  it looks good with regular fonts, and provides configuration points so you can use unicode or powerline symbols.
-*  it's fast to load, taking roughly 1ms.  by comparison, powerline needs 60ms on the same machine.
-*  it's fully customizable; if you know a little `statusline` syntax you can tweak it to your needs.
-*  it's trivial to write colorschemes; for a minimal theme you need to edit 9 lines of colors. (please send pull requests if you create new themes!)
+*  100% vimscript; no python needed.
 
-What about [old powerline][a]?
+What about [vim-powerline][1]?
 
-*  the old version still works well, but since it's deprecated new features won't get added
-*  it uses different font codes, which makes it incompatible with other powerline bindings in the same terminal (e.g. bash, zsh, tmux, etc.)
+*  vim-powerline has been deprecated in favor of the newer, unifying powerline, which is under active development; the new version is written in python at the core and exposes various bindings such that it can style statuslines not only in vim, but also tmux, bash, zsh, and others.
 
-# Why's it called airline?
+# Where did the name come from?
 
 I wrote the initial version on an airplane, and since it's light as air it turned out to be a good name.  Thanks for flying vim!
 
@@ -29,72 +245,120 @@ I wrote the initial version on an airplane, and since it's light as air it turne
 
 This plugin follows the standard runtime path structure, and as such it can be installed with a variety of plugin managers:
 
-*  [pathogen][k]
-  *  `git clone https://github.com/bling/vim-airline ~/.vim/bundle/vim-airline`
-*  [neobundle][l]
-  *  `NeoBundle 'bling/vim-airline'`
-*  [vundle][m]
-  *  `Bundle 'bling/vim-airline'`
-*  manual
-  *  copy all of the files into your `~/.vim` directory
+| Plugin Manager | Install with... |
+| ------------- | ------------- |
+| [Pathogen][11] | `git clone https://github.com/vim-airline/vim-airline ~/.vim/bundle/vim-airline`<br/>Remember to run `:Helptags` to generate help tags |
+| [NeoBundle][12] | `NeoBundle 'vim-airline/vim-airline'` |
+| [Vundle][13] | `Plugin 'vim-airline/vim-airline'` |
+| [Plug][40] | `Plug 'vim-airline/vim-airline'` |
+| [VAM][22] | `call vam#ActivateAddons([ 'vim-airline' ])` |
+| [Dein][52] | `call dein#add('vim-airline/vim-airline')` |
+| [minpac][55] | `call minpac#add('vim-airline/vim-airline')` |
+| pack feature (native Vim 8 package feature)| `git clone https://github.com/vim-airline/vim-airline ~/.vim/pack/dist/start/vim-airline`<br/>Remember to run `:helptags ~/.vim/pack/dist/start/vim-airline/doc` to generate help tags |
+| manual | copy all of the files into your `~/.vim` directory |
 
-# Configuration
+# Documentation
 
 `:help airline`
 
 # Integrating with powerline fonts
 
-For the nice looking powerline symbols to appear, you will need to install a patched font.  Instructions can be found in the official powerline [documentation][t].  Prepatched fonts can be found in the [powerline-fonts][c] repository.
+For the nice looking powerline symbols to appear, you will need to install a patched font.  Instructions can be found in the official powerline [documentation][20].  Prepatched fonts can be found in the [powerline-fonts][3] repository.
 
-Finally, enable them in vim-airline by adding `let g:airline_powerline_fonts = 1` to your vimrc.
-
-# Bugs
-
-If you encounter a bug, please do the following:
-
-*  reproduce it with this [minivimrc][g] repository to rule out any configuration conflicts.
-*  specify your version and patch level, as well as operating system (found with `:version`).
-*  a link to a gist or your vimrc where it can be reproduced.
+Finally, you can add the convenience variable `let g:airline_powerline_fonts = 1` to your vimrc which will automatically populate the `g:airline_symbols` dictionary with the powerline symbols.
 
 # FAQ
 
-Solutions to common problems can be found in the [Wiki](https://github.com/bling/vim-airline/wiki/FAQ).
+Solutions to common problems can be found in the [Wiki][27].
+
+# Performance
+
+Whoa! Everything got slow all of a sudden...
+
+vim-airline strives to make it easy to use out of the box, which means that by default it will look for all compatible plugins that you have installed and enable the relevant extension.
+
+Many optimizations have been made such that the majority of users will not see any performance degradation, but it can still happen.  For example, users who routinely open very large files may want to disable the `tagbar` extension, as it can be very expensive to scan for the name of the current function.
+
+The [minivimrc][7] project has some helper mappings to troubleshoot performance related issues.
+
+If you don't want all the bells and whistles enabled by default, you can define a value for `g:airline_extensions`.  When this variable is defined, only the extensions listed will be loaded; an empty array would effectively disable all extensions (e.g. `:let g:airline_extensions = []`).
+
+Also, you can enable caching of the various syntax highlighting groups. This will try to prevent some of the more expensive `:hi` calls in Vim, which seem to be expensive in the Vim core at the expense of possibly not being one hundred percent correct all the time (especially if you often change highlighting groups yourself using `:hi` commands). To set this up do `:let g:airline_highlighting_cache = 1`. A `:AirlineRefresh` will however clear the cache.
+
+In addition you might want to check out the [dark_minimal theme][56], which does not change highlighting groups once they are defined. Also please check the [FAQ][27] for more information on how to diagnose and fix the problem.
 
 # Screenshots
 
-A full list of screenshots can be found in the [Wiki][n].
+A full list of screenshots for various themes can be found in the [Wiki][14].
 
-# Contributions
+# Maintainers
 
-Contributions and pull requests are welcome.  Please take note of the following guidelines:
+The project is currently being maintained by [Bailey Ling][41], [Christian Brabandt][42], and [Mike Hartington][44].
 
-*  adhere to the existing style as much as possible; notably, 2 space indents and long-form keywords.
-*  keep the history clean! squash your branches before you submit a pull request. `pull --rebase` is your friend.
-*  this plugin got a lot more popular than i initially expected, if you make changes to the core, please test on as many versions of vim as possible.
-*  if you submit a theme, please create a screenshot so it can be added to the [Wiki][n].
+If you are interested in becoming a maintainer (we always welcome more maintainers), please [go here][43].
 
 # License
 
-Distributed under the same terms as the Vim license.  See `:help license`.
+[MIT License][58]. Copyright (c) 2013-2020 Bailey Ling & Contributors.
 
-
-[a]: https://github.com/Lokaltog/vim-powerline
-[b]: https://github.com/Lokaltog/powerline
-[c]: https://github.com/Lokaltog/powerline-fonts
-[d]: https://github.com/tpope/vim-fugitive
-[e]: https://github.com/scrooloose/syntastic
-[f]: https://github.com/bling/vim-bufferline
-[g]: https://github.com/bling/minivimrc
-[h]: http://en.wikipedia.org/wiki/Open/closed_principle
-[i]: https://github.com/Shougo/unite.vim
-[j]: https://github.com/kien/ctrlp.vim
-[k]: https://github.com/tpope/vim-pathogen
-[l]: https://github.com/Shougo/neobundle.vim
-[m]: https://github.com/gmarik/vundle
-[n]: https://github.com/bling/vim-airline/wiki/Screenshots
-[o]: https://github.com/techlivezheng/vim-plugin-minibufexpl
-[p]: https://github.com/sjl/gundo.vim
-[q]: https://github.com/mbbill/undotree
-[r]: https://github.com/scrooloose/nerdtree
-[s]: https://github.com/majutsushi/tagbar
-[t]: https://powerline.readthedocs.org/en/latest/fontpatching.html
+[1]: https://github.com/Lokaltog/vim-powerline
+[2]: https://github.com/Lokaltog/powerline
+[3]: https://github.com/Lokaltog/powerline-fonts
+[4]: https://github.com/tpope/vim-fugitive
+[5]: https://github.com/scrooloose/syntastic
+[6]: https://github.com/bling/vim-bufferline
+[7]: https://github.com/bling/minivimrc
+[8]: http://en.wikipedia.org/wiki/Open/closed_principle
+[9]: https://github.com/Shougo/unite.vim
+[10]: https://github.com/ctrlpvim/ctrlp.vim
+[11]: https://github.com/tpope/vim-pathogen
+[12]: https://github.com/Shougo/neobundle.vim
+[13]: https://github.com/VundleVim/Vundle.vim
+[14]: https://github.com/vim-airline/vim-airline/wiki/Screenshots
+[15]: https://github.com/techlivezheng/vim-plugin-minibufexpl
+[16]: https://github.com/sjl/gundo.vim
+[17]: https://github.com/mbbill/undotree
+[18]: https://github.com/preservim/nerdtree
+[19]: https://github.com/majutsushi/tagbar
+[20]: https://powerline.readthedocs.org/en/master/installation.html#patched-fonts
+[21]: https://bitbucket.org/ludovicchabant/vim-lawrencium
+[22]: https://github.com/MarcWeber/vim-addon-manager
+[23]: https://github.com/altercation/solarized
+[24]: https://github.com/chriskempson/tomorrow-theme
+[25]: https://github.com/tomasr/molokai
+[26]: https://github.com/nanotech/jellybeans.vim
+[27]: https://github.com/vim-airline/vim-airline/wiki/FAQ
+[28]: https://github.com/chrisbra/csv.vim
+[29]: https://github.com/airblade/vim-gitgutter
+[30]: https://github.com/mhinz/vim-signify
+[31]: https://github.com/jmcantrell/vim-virtualenv
+[32]: https://github.com/chriskempson/base16-vim
+[33]: https://github.com/vim-airline/vim-airline/wiki/Test-Plan
+[34]: http://eclim.org
+[35]: https://github.com/edkolev/tmuxline.vim
+[36]: https://github.com/edkolev/promptline.vim
+[37]: https://github.com/gcmt/taboo.vim
+[38]: https://github.com/vim-ctrlspace/vim-ctrlspace
+[39]: https://github.com/tomtom/quickfixsigns_vim
+[40]: https://github.com/junegunn/vim-plug
+[41]: https://github.com/bling
+[42]: https://github.com/chrisbra
+[43]: https://github.com/vim-airline/vim-airline/wiki/Becoming-a-Maintainer
+[44]: https://github.com/mhartington
+[45]: https://github.com/vim-airline/vim-airline/commit/d7fd8ca649e441b3865551a325b10504cdf0711b
+[46]: https://github.com/vim-airline/vim-airline-themes#vim-airline-themes--
+[47]: https://github.com/mildred/vim-bufmru
+[48]: https://github.com/ierton/xkb-switch
+[49]: https://github.com/vovkasm/input-source-switcher
+[50]: https://github.com/jreybert/vimagit
+[51]: https://github.com/Shougo/denite.nvim
+[52]: https://github.com/Shougo/dein.vim
+[53]: https://github.com/lervag/vimtex
+[54]: https://github.com/mox-mox/vim-localsearch
+[55]: https://github.com/k-takata/minpac/
+[56]: https://github.com/vim-airline/vim-airline-themes/blob/master/autoload/airline/themes/dark_minimal.vim
+[57]: https://github.com/autozimu/LanguageClient-neovim
+[58]: https://github.com/vim-airline/vim-airline/blob/master/LICENSE
+[59]: https://github.com/neoclide/coc-git
+[60]: https://github.com/cdelledonne/vim-cmake
+[61]: http://github.com/lambdalisue/battery.vim/

Rakefile

@@ -0,0 +1,14 @@
+#!/usr/bin/env rake
+
+task :default => [:test]
+
+task :ci => [:dump, :test]
+
+task :dump do
+  sh 'vim --version'
+end
+
+task :test do
+  sh 'bundle exec vim-flavor test'
+end
+

autoload/airline.vim

@@ -1,176 +1,285 @@
-" vim: ts=2 sts=2 sw=2 fdm=indent
-let s:is_win32term = (has('win32') || has('win64')) && !has('gui_running')
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
 
-let s:airline_highlight_map = {
-      \ 'mode'           : 'Al2',
-      \ 'mode_separator' : 'Al3',
-      \ 'info'           : 'Al4',
-      \ 'info_separator' : 'Al5',
-      \ 'statusline'     : 'Al6',
-      \ 'file'           : 'Al7',
-      \ }
-let s:airline_highlight_groups = keys(s:airline_highlight_map)
+scriptencoding utf-8
 
-function! airline#exec_highlight(group, colors)
-  let colors = a:colors
-  if s:is_win32term
-    let colors = map(a:colors, 'v:val != "" && v:val > 128 ? v:val - 128 : v:val')
+let g:airline_statusline_funcrefs = get(g:, 'airline_statusline_funcrefs', [])
+
+let s:sections = ['a','b','c','gutter','x','y','z', 'error', 'warning']
+let s:inactive_funcrefs = []
+let s:contexts = {}
+let s:core_funcrefs = [
+      \ function('airline#extensions#apply'),
+      \ function('airline#extensions#default#apply') ]
+
+
+function! airline#add_statusline_func(name)
+  call airline#add_statusline_funcref(function(a:name))
+endfunction
+
+function! airline#add_statusline_funcref(function)
+  if index(g:airline_statusline_funcrefs, a:function) >= 0
+    call airline#util#warning(printf('The airline statusline funcref "%s" has already been added.', string(a:function)))
+    return
   endif
-  exec printf('hi %s %s %s %s %s %s %s %s',
-        \ a:group,
-        \ colors[0] != '' ? 'guifg='.colors[0] : '',
-        \ colors[1] != '' ? 'guibg='.colors[1] : '',
-        \ colors[2] != '' ? 'ctermfg='.colors[2] : '',
-        \ colors[3] != '' ? 'ctermbg='.colors[3] : '',
-        \ colors[4] != '' ? 'gui='.colors[4] : '',
-        \ colors[4] != '' ? 'cterm='.colors[4] : '',
-        \ colors[4] != '' ? 'term='.colors[4] : '')
+  call add(g:airline_statusline_funcrefs, a:function)
 endfunction
 
-function! airline#load_theme(name)
-  let g:airline_theme = a:name
-  let inactive_colors = g:airline#themes#{g:airline_theme}#inactive "also lazy loads the theme
-  let w:airline_lastmode = ''
-  let w:airline_active = 1
-  call airline#highlight(['inactive'])
-  call airline#update_highlight()
+function! airline#remove_statusline_func(name)
+  let i = index(g:airline_statusline_funcrefs, function(a:name))
+  if i > -1
+    call remove(g:airline_statusline_funcrefs, i)
+  endif
 endfunction
 
-function! airline#highlight(modes)
-  " draw the base mode, followed by any overrides
-  let mapped = map(a:modes, 'v:val == a:modes[0] ? v:val : a:modes[0]."_".v:val')
-  for mode in mapped
-    for key in s:airline_highlight_groups
-      if exists('g:airline#themes#{g:airline_theme}#{mode}[key]')
-        let colors = g:airline#themes#{g:airline_theme}#{mode}[key]
-        let suffix = a:modes[0] == 'inactive' ? '_inactive' : ''
-        call airline#exec_highlight(s:airline_highlight_map[key].suffix, colors)
+function! airline#add_inactive_statusline_func(name)
+  call add(s:inactive_funcrefs, function(a:name))
+endfunction
+
+function! airline#load_theme()
+  let g:airline_theme = get(g:, 'airline_theme', 'dark')
+  if exists('*airline#themes#{g:airline_theme}#refresh')
+    call airline#themes#{g:airline_theme}#refresh()
+  endif
+
+  let palette = g:airline#themes#{g:airline_theme}#palette
+  call airline#themes#patch(palette)
+
+  if exists('g:airline_theme_patch_func')
+    let Fn = function(g:airline_theme_patch_func)
+    call Fn(palette)
+  endif
+
+  call airline#highlighter#load_theme()
+  call airline#extensions#load_theme()
+  call airline#update_statusline()
+endfunction
+
+" Load an airline theme
+function! airline#switch_theme(name, ...)
+  let silent = get(a:000, '0', 0)
+  " get all available themes
+  let themes = airline#util#themes('')
+  let err = 0
+  try
+    if index(themes, a:name) == -1
+      " Theme not available
+      if !silent
+        call airline#util#warning(printf('The specified theme "%s" cannot be found.', a:name))
       endif
-    endfor
-  endfor
+      throw "not-found"
+      let err = 1
+    else
+      exe "ru autoload/airline/themes/". a:name. ".vim"
+      let g:airline_theme = a:name
+    endif
+  catch /^Vim/
+    " catch only Vim errors, not "not-found"
+    call airline#util#warning(printf('There is an error in theme "%s".', a:name))
+    if &vbs
+      call airline#util#warning(v:exception)
+    endif
+    let err = 1
+  endtry
+
+  if err
+    if exists('g:airline_theme')
+      return
+    else
+      let g:airline_theme = 'dark'
+    endif
+  endif
+
+  unlet! w:airline_lastmode
+  call airline#load_theme()
+
+  call airline#util#doautocmd('AirlineAfterTheme')
+
+  " this is required to prevent clobbering the startup info message, i don't know why...
+  call airline#check_mode(winnr())
 endfunction
 
-function! s:is_excluded_window()
-  for matchft in g:airline_exclude_filetypes
-    if matchft ==# &ft
+" Try to load the right theme for the current colorscheme
+function! airline#switch_matching_theme()
+  if exists('g:colors_name')
+    let existing = g:airline_theme
+    let theme = tr(tolower(g:colors_name), '-', '_')
+    try
+      call airline#switch_theme(theme, 1)
       return 1
-    endif
-  endfor
-  for matchw in g:airline_exclude_filenames
-    if matchstr(expand('%'), matchw) ==# matchw
-      return 1
-    endif
-  endfor
-  if g:airline_exclude_preview && &previewwindow
-    return 1
+    catch
+      for map in items(g:airline_theme_map)
+        if match(g:colors_name, map[0]) > -1
+          try
+            call airline#switch_theme(map[1], 1)
+          catch
+            call airline#switch_theme(existing)
+          endtry
+          return 1
+        endif
+      endfor
+    endtry
   endif
   return 0
 endfunction
 
-function! s:apply_window_overrides()
-  call airline#extensions#clear_window_overrides()
-
-  if &buftype == 'quickfix'
-    let w:airline_section_a = 'Quickfix'
-    let w:airline_section_b = ''
-    let w:airline_section_c = ''
-    let w:airline_section_x = ''
+" Update the statusline
+function! airline#update_statusline()
+  if airline#util#stl_disabled(winnr())
+    return
   endif
+  let range = filter(range(1, winnr('$')), 'v:val != winnr()')
+  " create inactive statusline
+  call airline#update_statusline_inactive(range)
 
-  if &previewwindow
-    let w:airline_section_a = 'Preview'
-    let w:airline_section_b = ''
-    let w:airline_section_c = bufname(winbufnr(winnr()))
+  unlet! w:airline_render_left w:airline_render_right
+  exe 'unlet! ' 'w:airline_section_'. join(s:sections, ' w:airline_section_')
+
+  " Now create the active statusline
+  let w:airline_active = 1
+  let context = { 'winnr': winnr(), 'active': 1, 'bufnr': winbufnr(winnr()) }
+  call s:invoke_funcrefs(context, g:airline_statusline_funcrefs)
+endfunction
+
+" Function to be called to make all statuslines inactive
+" Triggered on FocusLost autocommand
+function! airline#update_statusline_focuslost()
+  if get(g:, 'airline_focuslost_inactive', 0)
+    let bufnr=bufnr('%')
+    call airline#highlighter#highlight_modified_inactive(bufnr)
+    call airline#highlighter#highlight(['inactive'], bufnr)
+    call airline#update_statusline_inactive(range(1, winnr('$')))
   endif
+endfunction
 
-  for FuncRef in g:airline_window_override_funcrefs
-    call FuncRef()
+" Function to draw inactive statuslines for inactive windows
+function! airline#update_statusline_inactive(range)
+  if airline#util#stl_disabled(winnr())
+    return
+  endif
+  for nr in a:range
+    if airline#util#stl_disabled(nr)
+      continue
+    endif
+    call setwinvar(nr, 'airline_active', 0)
+    let context = { 'winnr': nr, 'active': 0, 'bufnr': winbufnr(nr) }
+    if get(g:, 'airline_inactive_alt_sep', 0)
+      call extend(context, {
+            \ 'left_sep': g:airline_left_alt_sep,
+            \ 'right_sep': g:airline_right_alt_sep }, 'keep')
+    endif
+    call s:invoke_funcrefs(context, s:inactive_funcrefs)
   endfor
 endfunction
 
-function! airline#update_externals()
-  let g:airline_externals_bufferline = g:airline_enable_bufferline && exists('g:bufferline_loaded') ? '%{bufferline#generate_string()}' : "%f%m"
-  let g:airline_externals_syntastic = g:airline_enable_syntastic && exists('g:loaded_syntastic_plugin') ? '%{SyntasticStatuslineFlag()}' : ''
-  let g:airline_externals_fugitive = g:airline_enable_fugitive && exists('g:loaded_fugitive') && strlen(fugitive#head()) > 0
-        \ ? g:airline_fugitive_prefix.fugitive#head() : ''
+" Gather output from all funcrefs which will later be returned by the
+" airline#statusline() function
+function! s:invoke_funcrefs(context, funcrefs)
+  let builder = airline#builder#new(a:context)
+  let err = airline#util#exec_funcrefs(a:funcrefs + s:core_funcrefs, builder, a:context)
+  if err == 1
+    let a:context.line = builder.build()
+    let s:contexts[a:context.winnr] = a:context
+    let option = get(g:, 'airline_statusline_ontop', 0) ? '&tabline' : '&statusline'
+    call setwinvar(a:context.winnr, option, '%!airline#statusline('.a:context.winnr.')')
+  endif
 endfunction
 
-function! s:get_section(key)
-  return exists('w:airline_section_{a:key}') ? w:airline_section_{a:key} : g:airline_section_{a:key}
+" Main statusline function per window
+" will be set to the statusline option
+function! airline#statusline(winnr)
+  if has_key(s:contexts, a:winnr)
+    return '%{airline#check_mode('.a:winnr.')}'.s:contexts[a:winnr].line
+  endif
+  " in rare circumstances this happens...see #276
+  return ''
 endfunction
 
-function! airline#update_statusline(active)
-  let w:airline_active = a:active
-  if s:is_excluded_window()
-    call setwinvar(winnr(), '&statusline', '')
-    return
+" Check if mode has changed
+function! airline#check_mode(winnr)
+  if !has_key(s:contexts, a:winnr)
+    return ''
   endif
+  let context = s:contexts[a:winnr]
 
-  call airline#update_externals()
-  call s:apply_window_overrides()
-
-  let l:mode_color      = a:active ? "%#Al2#" : "%#Al2_inactive#"
-  let l:mode_sep_color  = a:active ? "%#Al3#" : "%#Al3_inactive#"
-  let l:info_color      = a:active ? "%#Al4#" : "%#Al4_inactive#"
-  let l:info_sep_color  = a:active ? "%#Al5#" : "%#Al5_inactive#"
-  let l:status_color    = a:active ? "%#Al6#" : "%#Al6_inactive#"
-  let l:file_flag_color = a:active ? "%#Al7#" : "%#Al7_inactive#"
-
-  let sl = '%{airline#update_highlight()}'
-  if a:active
-    let sl.=l:mode_color.' '.s:get_section('a').' '
-    let sl.=l:mode_sep_color
-    let sl.=a:active ? g:airline_left_sep : g:airline_left_alt_sep
-    let sl.=l:info_color
-    let sl.=' '.s:get_section('b').' '
-    let sl.=l:info_sep_color
-    let sl.=g:airline_left_sep
-    let sl.=l:status_color.' %<'.s:get_section('c').' '
-    let sl.=exists('w:airline_section_gutter')
-          \ ? s:get_section('gutter')
-          \ : '%#warningmsg#'.g:airline_externals_syntastic.l:file_flag_color."%{&ro ? g:airline_readonly_symbol : ''}".l:status_color
-  else
-    let sl.=l:status_color.' %f%m'
-  endif
-  if !exists('w:airline_left_only')
-    let sl.='%= '.s:get_section('x').' '
-    let sl.=l:info_sep_color
-    let sl.=a:active ? g:airline_right_sep : g:airline_right_alt_sep
-    let sl.=l:info_color
-    let sl.=' '.s:get_section('y').' '
-    let sl.=l:mode_sep_color
-    let sl.=a:active ? g:airline_right_sep : g:airline_right_alt_sep
-    let sl.=l:mode_color
-    let sl.=' '.s:get_section('z').' '
-  endif
-  call setwinvar(winnr(), '&statusline', sl)
-endfunction
-
-let g:airline_current_mode_text = ''
-function! airline#update_highlight()
-  if w:airline_active
-    let l:m = mode()
+  if get(w:, 'airline_active', 1)
+    let l:m = mode(1)
     if l:m ==# "i"
       let l:mode = ['insert']
-    elseif l:m ==# "R"
+    elseif l:m[0] ==# "i"
+      let l:mode = ['insert']
+    elseif l:m ==# "Rv"
+      let l:mode =['replace']
+    elseif l:m[0] ==# "R"
       let l:mode = ['replace']
-    elseif l:m ==? "v" || l:m ==# ""
+    elseif l:m[0] =~# '\v(v|V||s|S|)'
       let l:mode = ['visual']
+    elseif l:m ==# "t"
+      let l:mode = ['terminal']
+    elseif l:m[0] ==# "c"
+      let l:mode = ['commandline']
+    elseif l:m ==# "no"   " does not work, most likely, Vim does not refresh the statusline in OP mode
+      let l:mode = ['normal']
+    elseif l:m[0:1] ==# 'ni'
+      let l:mode = ['insert']
+      let l:m = 'ni'
     else
       let l:mode = ['normal']
     endif
-    let g:airline_current_mode_text = get(g:airline_mode_map, l:m, l:m)
+    if exists("*VMInfos") && !empty(VMInfos())
+      " Vim plugin Multiple Cursors https://github.com/mg979/vim-visual-multi
+      let l:m = 'multi'
+    endif
+    if index(['Rv', 'no', 'ni', 'ix', 'ic', 'multi'], l:m) == -1
+      let l:m = l:m[0]
+    endif
+    let w:airline_current_mode = get(g:airline_mode_map, l:m, l:m)
   else
     let l:mode = ['inactive']
+    let w:airline_current_mode = get(g:airline_mode_map, '__')
   endif
 
-  if &modified | call add(l:mode, 'modified') | endif
-  if &paste    | call add(l:mode, 'paste')    | endif
+  if g:airline_detect_modified && &modified
+    call add(l:mode, 'modified')
+  endif
+
+  if g:airline_detect_paste && &paste
+    call add(l:mode, 'paste')
+  endif
+
+  if g:airline_detect_crypt && exists("+key") && !empty(&key)
+    call add(l:mode, 'crypt')
+  endif
+
+  if g:airline_detect_spell && &spell
+    call add(l:mode, 'spell')
+  endif
+
+  if &readonly || ! &modifiable
+    call add(l:mode, 'readonly')
+  endif
 
   let mode_string = join(l:mode)
-  if !exists('w:airline_lastmode') || w:airline_lastmode != mode_string
-    call airline#highlight(l:mode)
+  if get(w:, 'airline_lastmode', '') != mode_string
+    call airline#highlighter#highlight_modified_inactive(context.bufnr)
+    call airline#highlighter#highlight(l:mode, string(context.bufnr))
+    call airline#util#doautocmd('AirlineModeChanged')
     let w:airline_lastmode = mode_string
   endif
+
   return ''
 endfunction
+
+function! airline#update_tabline()
+  if get(g:, 'airline_statusline_ontop', 0)
+    call airline#extensions#tabline#redraw()
+  endif
+endfunction
+
+function! airline#mode_changed()
+  " airline#visual_active
+  " Boolean: for when to get visual wordcount
+  " needed for the wordcount extension
+  let g:airline#visual_active = (mode() =~? '[vs]')
+  call airline#update_tabline()
+endfunction

autoload/airline/async.vim

@@ -0,0 +1,382 @@
+" MIT License. Copyright (c) 2013-2020 Christian Brabandt et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:untracked_jobs = {}
+let s:mq_jobs        = {}
+let s:po_jobs        = {}
+let s:clean_jobs     = {}
+
+" Generic functions handling on exit event of the various async functions
+function! s:untracked_output(dict, buf)
+  if a:buf =~? ('^'. a:dict.cfg['untracked_mark'])
+    let a:dict.cfg.untracked[a:dict.file] = get(g:, 'airline#extensions#branch#notexists', g:airline_symbols.notexists)
+  else
+    let a:dict.cfg.untracked[a:dict.file] = ''
+  endif
+endfunction
+
+" also called from branch extension (for non-async vims)
+function! airline#async#mq_output(buf, file)
+  let buf=a:buf
+  if !empty(a:buf)
+    if a:buf =~# 'no patches applied' ||
+      \ a:buf =~# "unknown command 'qtop'" ||
+      \ a:buf =~# "abort"
+      let buf = ''
+    elseif exists("b:mq") && b:mq isnot# buf
+      " make sure, statusline is updated
+      unlet! b:airline_head
+    endif
+    let b:mq = buf
+  endif
+  if has_key(s:mq_jobs, a:file)
+    call remove(s:mq_jobs, a:file)
+  endif
+endfunction
+
+function! s:po_output(buf, file)
+  if !empty(a:buf)
+    let b:airline_po_stats = printf("%s", a:buf)
+  else
+    let b:airline_po_stats = ''
+  endif
+  if has_key(s:po_jobs, a:file)
+    call remove(s:po_jobs, a:file)
+  endif
+endfunction
+
+function! s:valid_dir(dir)
+  if empty(a:dir) || !isdirectory(a:dir)
+    return getcwd()
+  endif
+  return a:dir
+endfunction
+
+function! airline#async#vcs_untracked(config, file, vcs)
+  if g:airline#init#vim_async
+    " Vim 8 with async support
+    noa call airline#async#vim_vcs_untracked(a:config, a:file)
+  else
+    " nvim async or vim without job-feature
+    noa call airline#async#nvim_vcs_untracked(a:config, a:file, a:vcs)
+  endif
+endfunction
+
+function! s:set_clean_variables(file, vcs, val)
+  let var=getbufvar(fnameescape(a:file), 'buffer_vcs_config', {})
+  if has_key(var, a:vcs) && has_key(var[a:vcs], 'dirty') &&
+        \ type(getbufvar(fnameescape(a:file), 'buffer_vcs_config')) == type({})
+    let var[a:vcs].dirty=a:val
+    try
+      call setbufvar(fnameescape(a:file), 'buffer_vcs_config', var)
+      unlet! b:airline_head
+    catch
+    endtry
+  endif
+endfunction
+
+function! s:set_clean_jobs_variable(vcs, file, id)
+  if !has_key(s:clean_jobs, a:vcs)
+    let s:clean_jobs[a:vcs] = {}
+  endif
+  let s:clean_jobs[a:vcs][a:file]=a:id
+endfunction
+
+function! s:on_exit_clean(...) dict abort
+  let buf=self.buf
+  call s:set_clean_variables(self.file, self.vcs, !empty(buf))
+  if has_key(get(s:clean_jobs, self.vcs, {}), self.file)
+    call remove(s:clean_jobs[self.vcs], self.file)
+  endif
+endfunction
+
+function! airline#async#vcs_clean(cmd, file, vcs)
+  if g:airline#init#vim_async
+    " Vim 8 with async support
+    noa call airline#async#vim_vcs_clean(a:cmd, a:file, a:vcs)
+  elseif has("nvim")
+    " nvim async
+    noa call airline#async#nvim_vcs_clean(a:cmd, a:file, a:vcs)
+  else
+    " Vim pre 8 using system()
+    call airline#async#vim7_vcs_clean(a:cmd, a:file, a:vcs)
+  endif
+endfunction
+
+if v:version >= 800 && has("job")
+  " Vim 8.0 with Job feature
+  " TODO: Check if we need the cwd option for the job_start() functions
+  "       (only works starting with Vim 8.0.0902)
+
+  function! s:on_stdout(channel, msg) dict abort
+    let self.buf .= a:msg
+  endfunction
+
+  function! s:on_exit_mq(channel) dict abort
+    call airline#async#mq_output(self.buf, self.file)
+  endfunction
+
+  function! s:on_exit_untracked(channel) dict abort
+    call s:untracked_output(self, self.buf)
+    if has_key(s:untracked_jobs, self.file)
+      call remove(s:untracked_jobs, self.file)
+    endif
+  endfunction
+
+  function! s:on_exit_po(channel) dict abort
+    call s:po_output(self.buf, self.file)
+    call airline#extensions#po#shorten()
+  endfunction
+
+  function! airline#async#get_mq_async(cmd, file)
+    if g:airline#init#is_windows && &shell =~ 'cmd\|powershell'
+      let cmd = a:cmd
+    else
+      let cmd = [&shell, &shellcmdflag, a:cmd]
+    endif
+
+    let options = {'cmd': a:cmd, 'buf': '', 'file': a:file}
+    if has_key(s:mq_jobs, a:file)
+      if job_status(get(s:mq_jobs, a:file)) == 'run'
+        return
+      elseif has_key(s:mq_jobs, a:file)
+        call remove(s:mq_jobs, a:file)
+      endif
+    endif
+    let id = job_start(cmd, {
+          \ 'err_io':   'out',
+          \ 'out_cb':   function('s:on_stdout', options),
+          \ 'close_cb': function('s:on_exit_mq', options)})
+    let s:mq_jobs[a:file] = id
+  endfunction
+
+  function! airline#async#get_msgfmt_stat(cmd, file)
+    if !executable('msgfmt')
+      " no msgfmt
+      return
+    endif
+    if g:airline#init#is_windows
+      let cmd = 'cmd /C ' . a:cmd. shellescape(a:file)
+    else
+      let cmd = ['sh', '-c', a:cmd. shellescape(a:file)]
+    endif
+
+    let options = {'buf': '', 'file': a:file}
+    if has_key(s:po_jobs, a:file)
+      if job_status(get(s:po_jobs, a:file)) == 'run'
+        return
+      elseif has_key(s:po_jobs, a:file)
+        call remove(s:po_jobs, a:file)
+      endif
+    endif
+    let id = job_start(cmd, {
+          \ 'err_io':   'out',
+          \ 'out_cb':   function('s:on_stdout', options),
+          \ 'close_cb': function('s:on_exit_po', options)})
+    let s:po_jobs[a:file] = id
+  endfunction
+
+  function! airline#async#vim_vcs_clean(cmd, file, vcs)
+    if g:airline#init#is_windows && &shell =~ 'cmd\|powershell'
+      let cmd = a:cmd
+    else
+      let cmd = [&shell, &shellcmdflag, a:cmd]
+    endif
+
+    let options = {'buf': '', 'vcs': a:vcs, 'file': a:file}
+    let jobs = get(s:clean_jobs, a:vcs, {})
+    if has_key(jobs, a:file)
+      if job_status(get(jobs, a:file)) == 'run'
+        return
+      elseif has_key(jobs, a:file)
+        " still running
+        return
+        " jobs dict should be cleaned on exit, so not needed here
+        " call remove(jobs, a:file)
+      endif
+    endif
+    let id = job_start(cmd, {
+          \ 'err_io':   'null',
+          \ 'out_cb':   function('s:on_stdout', options),
+          \ 'close_cb': function('s:on_exit_clean', options)})
+    call s:set_clean_jobs_variable(a:vcs, a:file, id)
+  endfunction
+
+  function! airline#async#vim_vcs_untracked(config, file)
+    if g:airline#init#is_windows && &shell =~ 'cmd\|powershell'
+      let cmd = a:config['cmd'] . shellescape(a:file)
+    else
+      let cmd = [&shell, &shellcmdflag, a:config['cmd'] . shellescape(a:file)]
+    endif
+
+    let options = {'cfg': a:config, 'buf': '', 'file': a:file}
+    if has_key(s:untracked_jobs, a:file)
+      if job_status(get(s:untracked_jobs, a:file)) == 'run'
+        return
+      elseif has_key(s:untracked_jobs, a:file)
+        call remove(s:untracked_jobs, a:file)
+      endif
+    endif
+    let id = job_start(cmd, {
+          \ 'err_io':   'out',
+          \ 'out_cb':   function('s:on_stdout', options),
+          \ 'close_cb': function('s:on_exit_untracked', options)})
+    let s:untracked_jobs[a:file] = id
+  endfunction
+
+elseif has("nvim")
+  " NVim specific functions
+
+  function! s:nvim_output_handler(job_id, data, event) dict
+    if a:event == 'stdout' || a:event == 'stderr'
+      let self.buf .=  join(a:data)
+    endif
+  endfunction
+
+  function! s:nvim_untracked_job_handler(job_id, data, event) dict
+    if a:event == 'exit'
+      call s:untracked_output(self, self.buf)
+      if has_key(s:untracked_jobs, self.file)
+        call remove(s:untracked_jobs, self.file)
+      endif
+    endif
+  endfunction
+
+  function! s:nvim_mq_job_handler(job_id, data, event) dict
+    if a:event == 'exit'
+      call airline#async#mq_output(self.buf, self.file)
+    endif
+  endfunction
+
+  function! s:nvim_po_job_handler(job_id, data, event) dict
+    if a:event == 'exit'
+      call s:po_output(self.buf, self.file)
+      call airline#extensions#po#shorten()
+    endif
+  endfunction
+
+  function! airline#async#nvim_get_mq_async(cmd, file)
+    let config = {
+    \ 'buf': '',
+    \ 'file': a:file,
+    \ 'cwd': s:valid_dir(fnamemodify(a:file, ':p:h')),
+    \ 'on_stdout': function('s:nvim_output_handler'),
+    \ 'on_stderr': function('s:nvim_output_handler'),
+    \ 'on_exit': function('s:nvim_mq_job_handler')
+    \ }
+    if g:airline#init#is_windows && &shell =~ 'cmd\|powershell'
+      let cmd = a:cmd
+    else
+      let cmd = [&shell, &shellcmdflag, a:cmd]
+    endif
+
+    if has_key(s:mq_jobs, a:file)
+      call remove(s:mq_jobs, a:file)
+    endif
+    let id = jobstart(cmd, config)
+    let s:mq_jobs[a:file] = id
+  endfunction
+
+  function! airline#async#nvim_get_msgfmt_stat(cmd, file)
+    let config = {
+    \ 'buf': '',
+    \ 'file': a:file,
+    \ 'cwd': s:valid_dir(fnamemodify(a:file, ':p:h')),
+    \ 'on_stdout': function('s:nvim_output_handler'),
+    \ 'on_stderr': function('s:nvim_output_handler'),
+    \ 'on_exit': function('s:nvim_po_job_handler')
+    \ }
+    if g:airline#init#is_windows && &shell =~ 'cmd\|powershell'
+      " no msgfmt on windows?
+      return
+    else
+      let cmd = [&shell, &shellcmdflag, a:cmd. shellescape(a:file)]
+    endif
+
+    if has_key(s:po_jobs, a:file)
+      call remove(s:po_jobs, a:file)
+    endif
+    let id = jobstart(cmd, config)
+    let s:po_jobs[a:file] = id
+  endfunction
+
+  function! airline#async#nvim_vcs_clean(cmd, file, vcs)
+    let config = {
+    \ 'buf': '',
+    \ 'vcs': a:vcs,
+    \ 'file': a:file,
+    \ 'cwd': s:valid_dir(fnamemodify(a:file, ':p:h')),
+    \ 'on_stdout': function('s:nvim_output_handler'),
+    \ 'on_stderr': function('s:nvim_output_handler'),
+    \ 'on_exit': function('s:on_exit_clean')}
+    if g:airline#init#is_windows && &shell =~ 'cmd\|powershell'
+      let cmd = a:cmd
+    else
+      let cmd = [&shell, &shellcmdflag, a:cmd]
+    endif
+
+    if !has_key(s:clean_jobs, a:vcs)
+      let s:clean_jobs[a:vcs] = {}
+    endif
+    if has_key(s:clean_jobs[a:vcs], a:file)
+      " still running
+      return
+      " jobs dict should be cleaned on exit, so not needed here
+      " call remove(s:clean_jobs[a:vcs], a:file)
+    endif
+    let id = jobstart(cmd, config)
+    call s:set_clean_jobs_variable(a:vcs, a:file, id)
+  endfunction
+
+endif
+
+" Should work in either Vim pre 8 or Nvim
+function! airline#async#nvim_vcs_untracked(cfg, file, vcs)
+  let cmd = a:cfg.cmd . shellescape(a:file)
+  let id = -1
+  let config = {
+  \ 'buf': '',
+  \ 'vcs': a:vcs,
+  \ 'cfg': a:cfg,
+  \ 'file': a:file,
+  \ 'cwd': s:valid_dir(fnamemodify(a:file, ':p:h'))
+  \ }
+  if has("nvim")
+    call extend(config, {
+    \ 'on_stdout': function('s:nvim_output_handler'),
+    \ 'on_exit': function('s:nvim_untracked_job_handler')})
+    if has_key(s:untracked_jobs, config.file)
+      " still running
+      return
+    endif
+    try
+    let id = jobstart(cmd, config)
+    catch
+      " catch-all, jobstart() failed, fall back to system()
+      let id=-1
+    endtry
+    let s:untracked_jobs[a:file] = id
+  endif
+  " vim without job feature or nvim jobstart failed
+  if id < 1
+    let output=system(cmd)
+    call s:untracked_output(config, output)
+    call airline#extensions#branch#update_untracked_config(a:file, a:vcs)
+  endif
+endfunction
+
+function! airline#async#vim7_vcs_clean(cmd, file, vcs)
+  " Vim pre 8, fallback using system()
+  " don't want to to see error messages
+  if g:airline#init#is_windows && &shell =~ 'cmd'
+    let cmd = a:cmd .' 2>nul'
+  elseif g:airline#init#is_windows && &shell =~ 'powerline'
+    let cmd = a:cmd .' 2> $null'
+  else
+    let cmd = a:cmd .' 2>/dev/null'
+  endif
+  let output=system(cmd)
+  call s:set_clean_variables(a:file, a:vcs, !empty(output))
+endfunction

autoload/airline/builder.vim

@@ -0,0 +1,241 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:prototype = {}
+
+function! s:prototype.split(...) dict
+  call add(self._sections, ['|', a:0 ? a:1 : '%='])
+endfunction
+
+function! s:prototype.add_section_spaced(group, contents) dict
+  let spc = empty(a:contents) ? '' : g:airline_symbols.space
+  call self.add_section(a:group, spc.a:contents.spc)
+endfunction
+
+function! s:prototype.add_section(group, contents) dict
+  call add(self._sections, [a:group, a:contents])
+endfunction
+
+function! s:prototype.add_raw(text) dict
+  call add(self._sections, ['', a:text])
+endfunction
+
+function! s:prototype.insert_section(group, contents, position) dict
+  call insert(self._sections, [a:group, a:contents], a:position)
+endfunction
+
+function! s:prototype.insert_raw(text, position) dict
+  call insert(self._sections, ['', a:text], a:position)
+endfunction
+
+function! s:prototype.get_position() dict
+  return len(self._sections)
+endfunction
+
+function! airline#builder#get_prev_group(sections, i)
+  let x = a:i - 1
+  while x >= 0
+    let group = a:sections[x][0]
+    if group != '' && group != '|'
+      return group
+    endif
+    let x = x - 1
+  endwhile
+  return ''
+endfunction
+
+function! airline#builder#get_next_group(sections, i)
+  let x = a:i + 1
+  let l = len(a:sections)
+  while x < l
+    let group = a:sections[x][0]
+    if group != '' && group != '|'
+      return group
+    endif
+    let x = x + 1
+  endwhile
+  return ''
+endfunction
+
+function! s:prototype.build() dict
+  let side = 1
+  let line = ''
+  let i = 0
+  let length = len(self._sections)
+  let split = 0
+  let is_empty = 0
+  let prev_group = ''
+
+  while i < length
+    let section = self._sections[i]
+    let group = section[0]
+    let contents = section[1]
+    let pgroup = prev_group
+    let prev_group = airline#builder#get_prev_group(self._sections, i)
+    if group ==# 'airline_c' && &buftype ==# 'terminal' && self._context.active
+      let group = 'airline_term'
+    elseif group ==# 'airline_c' && !self._context.active && has_key(self._context, 'bufnr')
+      let group = 'airline_c'. self._context.bufnr
+    elseif prev_group ==# 'airline_c' && !self._context.active && has_key(self._context, 'bufnr')
+      let prev_group = 'airline_c'. self._context.bufnr
+    endif
+    if is_empty
+      let prev_group = pgroup
+    endif
+    let is_empty = s:section_is_empty(self, contents)
+
+    if is_empty
+      " need to fix highlighting groups, since we
+      " have skipped a section, we actually need
+      " the previous previous group and so the
+      " seperator goes from the previous previous group
+      " to the current group
+      let pgroup = group
+    endif
+
+    if group == ''
+      let line .= contents
+    elseif group == '|'
+      let side = 0
+      let line .= contents
+      let split = 1
+    else
+      if prev_group == ''
+        let line .= '%#'.group.'#'
+      elseif split
+        if !is_empty
+          let line .= s:get_transitioned_seperator(self, prev_group, group, side)
+        endif
+        let split = 0
+      else
+        if !is_empty
+          let line .= s:get_seperator(self, prev_group, group, side)
+        endif
+      endif
+      let line .= is_empty ? '' : s:get_accented_line(self, group, contents)
+    endif
+
+    let i = i + 1
+  endwhile
+
+  if !self._context.active
+    "let line = substitute(line, '%#airline_c#', '%#airline_c'.self._context.bufnr.'#', '')
+    let line = substitute(line, '%#.\{-}\ze#', '\0_inactive', 'g')
+  endif
+  return line
+endfunction
+
+function! airline#builder#should_change_group(group1, group2)
+  if a:group1 == a:group2
+    return 0
+  endif
+  let color1 = airline#highlighter#get_highlight(a:group1)
+  let color2 = airline#highlighter#get_highlight(a:group2)
+  return color1[1] != color2[1] || color1[0] != color2[0]
+      \ ||  color1[2] != color2[2] || color1[3] != color2[3]
+endfunction
+
+function! s:get_transitioned_seperator(self, prev_group, group, side)
+  let line = ''
+  if get(a:self._context, 'tabline', 0) && get(g:, 'airline#extensions#tabline#alt_sep', 0) && a:group ==# 'airline_tabsel' && a:side
+    call airline#highlighter#add_separator(a:prev_group, a:group, 0)
+    let line .= '%#'.a:prev_group.'_to_'.a:group.'#'
+    let line .=  a:self._context.right_sep.'%#'.a:group.'#'
+  else
+    call airline#highlighter#add_separator(a:prev_group, a:group, a:side)
+    let line .= '%#'.a:prev_group.'_to_'.a:group.'#'
+    let line .= a:side ? a:self._context.left_sep : a:self._context.right_sep
+    let line .= '%#'.a:group.'#'
+  endif
+  return line
+endfunction
+
+function! s:get_seperator(self, prev_group, group, side)
+  if airline#builder#should_change_group(a:prev_group, a:group)
+    return s:get_transitioned_seperator(a:self, a:prev_group, a:group, a:side)
+  else
+    return a:side ? a:self._context.left_alt_sep : a:self._context.right_alt_sep
+  endif
+endfunction
+
+function! s:get_accented_line(self, group, contents)
+  if a:self._context.active
+    " active window
+    let contents = []
+    let content_parts = split(a:contents, '__accent')
+    for cpart in content_parts
+      let accent = matchstr(cpart, '_\zs[^#]*\ze')
+      call add(contents, cpart)
+    endfor
+    let line = join(contents, a:group)
+    let line = substitute(line, '__restore__', a:group, 'g')
+  else
+    " inactive window
+    let line = substitute(a:contents, '%#__accent[^#]*#', '', 'g')
+    let line = substitute(line, '%#__restore__#', '', 'g')
+  endif
+  return line
+endfunction
+
+function! s:section_is_empty(self, content)
+  let start=1
+
+  " do not check for inactive windows or the tabline
+  if a:self._context.active == 0
+    return 0
+  elseif get(a:self._context, 'tabline', 0)
+    return 0
+  endif
+
+  " only check, if airline#skip_empty_sections == 1
+  if get(g:, 'airline_skip_empty_sections', 0) == 0
+    return 0
+  endif
+
+  " only check, if airline#skip_empty_sections == 1
+  if get(w:, 'airline_skip_empty_sections', -1) == 0
+    return 0
+  endif
+  " assume accents sections to be never empty
+  " (avoides, that on startup the mode message becomes empty)
+  if match(a:content, '%#__accent_[^#]*#.*__restore__#') > -1
+    return 0
+  endif
+  if empty(a:content)
+    return 1
+  endif
+  let list=matchlist(a:content, '%{\zs.\{-}\ze}', 1, start)
+  if empty(list)
+    return 0 " no function in statusline text
+  endif
+  while len(list) > 0
+    let expr = list[0]
+    try
+      " catch all exceptions, just in case
+      if !empty(eval(expr))
+        return 0
+      endif
+    catch
+      return 0
+    endtry
+    let start += 1
+    let list=matchlist(a:content, '%{\zs.\{-}\ze}', 1, start)
+  endw
+  return 1
+endfunction
+
+function! airline#builder#new(context)
+  let builder = copy(s:prototype)
+  let builder._context = a:context
+  let builder._sections = []
+
+  call extend(builder._context, {
+        \ 'left_sep': g:airline_left_sep,
+        \ 'left_alt_sep': g:airline_left_alt_sep,
+        \ 'right_sep': g:airline_right_sep,
+        \ 'right_alt_sep': g:airline_right_alt_sep,
+        \ }, 'keep')
+  return builder
+endfunction

autoload/airline/debug.vim

@@ -0,0 +1,51 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#debug#profile1()
+  profile start airline-profile-switch.log
+  profile func *
+  profile file *
+  split
+  for i in range(1, 1000)
+    wincmd w
+    redrawstatus
+  endfor
+  profile pause
+  noautocmd qall!
+endfunction
+
+function! airline#debug#profile2()
+  profile start airline-profile-cursor.log
+  profile func *
+  profile file *
+  edit blank
+  call setline(1, 'all your base are belong to us')
+  call setline(2, 'all your base are belong to us')
+  let positions = [[1,2], [2,2], [1,2], [1,1]]
+  for i in range(1, 1000)
+    for pos in positions
+      call cursor(pos[0], pos[1])
+      redrawstatus
+    endfor
+  endfor
+  profile pause
+  noautocmd qall!
+endfunction
+
+function! airline#debug#profile3()
+  profile start airline-profile-mode.log
+  profile func *
+  profile file *
+
+  for i in range(1000)
+    startinsert
+    redrawstatus
+    stopinsert
+    redrawstatus
+  endfor
+
+  profile pause
+  noautocmd qall!
+endfunction

autoload/airline/extensions.vim

@@ -1,50 +1,501 @@
-let s:sections = ['a','b','c','gutter','x','y','z']
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
 
-function! s:override_left_only(section1, section2)
-  let w:airline_section_a = a:section1
-  let w:airline_section_b = a:section2
-  let w:airline_section_c = ''
-  let w:airline_left_only = 1
+scriptencoding utf-8
+
+let s:loaded_ext = []
+let s:ext = {}
+let s:ext._theme_funcrefs = []
+
+function! s:ext.add_statusline_func(name) dict
+  call airline#add_statusline_func(a:name)
+endfunction
+function! s:ext.add_statusline_funcref(function) dict
+  call airline#add_statusline_funcref(a:function)
+endfunction
+function! s:ext.add_inactive_statusline_func(name) dict
+  call airline#add_inactive_statusline_func(a:name)
+endfunction
+function! s:ext.add_theme_func(name) dict
+  call add(self._theme_funcrefs, function(a:name))
 endfunction
 
-function! airline#extensions#clear_window_overrides()
-  silent! unlet w:airline_left_only
-  for section in s:sections
-    silent! unlet w:airline_section_{section}
+let s:script_path = tolower(resolve(expand('<sfile>:p:h')))
+
+let s:filetype_overrides = {
+      \ 'coc-explorer':  [ 'CoC Explorer', '' ],
+      \ 'defx':  ['defx', '%{b:defx.paths[0]}'],
+      \ 'fugitive': ['fugitive', '%{airline#util#wrap(airline#extensions#branch#get_head(),80)}'],
+      \ 'gundo': [ 'Gundo', '' ],
+      \ 'help':  [ 'Help', '%f' ],
+      \ 'minibufexpl': [ 'MiniBufExplorer', '' ],
+      \ 'startify': [ 'startify', '' ],
+      \ 'vim-plug': [ 'Plugins', '' ],
+      \ 'vimfiler': [ 'vimfiler', '%{vimfiler#get_status_string()}' ],
+      \ 'vimshell': ['vimshell','%{vimshell#get_status_string()}'],
+      \ 'vaffle' : [ 'Vaffle', '%{b:vaffle.dir}' ],
+      \ }
+
+if get(g:, 'airline#extensions#nerdtree_statusline', 1)
+  let s:filetype_overrides['nerdtree'] = [ get(g:, 'NERDTreeStatusline', 'NERD'), '' ]
+else
+  let s:filetype_overrides['nerdtree'] = ['NERDTree', '']
+endif
+
+let s:filetype_regex_overrides = {}
+
+function! s:check_defined_section(name)
+  if !exists('w:airline_section_{a:name}')
+    let w:airline_section_{a:name} = g:airline_section_{a:name}
+  endif
+endfunction
+
+function! airline#extensions#append_to_section(name, value)
+  call <sid>check_defined_section(a:name)
+  let w:airline_section_{a:name} .= a:value
+endfunction
+
+function! airline#extensions#prepend_to_section(name, value)
+  call <sid>check_defined_section(a:name)
+  let w:airline_section_{a:name} = a:value . w:airline_section_{a:name}
+endfunction
+
+function! airline#extensions#apply_left_override(section1, section2)
+  let w:airline_section_a = a:section1
+  let w:airline_section_b = a:section2
+  let w:airline_section_c = airline#section#create(['readonly'])
+  let w:airline_render_left = 1
+  let w:airline_render_right = 0
+endfunction
+
+function! airline#extensions#apply(...)
+  let filetype_overrides = get(s:, 'filetype_overrides', {})
+  call extend(filetype_overrides, get(g:, 'airline_filetype_overrides', {}), 'force')
+
+  if s:is_excluded_window()
+    return -1
+  endif
+
+  if &buftype == 'terminal'
+    let w:airline_section_x = ''
+    let w:airline_section_y = ''
+  endif
+
+  if &previewwindow && empty(get(w:, 'airline_section_a', ''))
+    let w:airline_section_a = 'Preview'
+    let w:airline_section_b = ''
+    let w:airline_section_c = bufname(winbufnr(winnr()))
+  endif
+
+  if has_key(filetype_overrides, &ft) &&
+        \ ((&filetype == 'help' && &buftype == 'help') || &filetype !~ 'help')
+    " for help files only override it, if the buftype is also of type 'help',
+    " else it would trigger when editing Vim help files
+    let args = filetype_overrides[&ft]
+    call airline#extensions#apply_left_override(args[0], args[1])
+  endif
+
+  if &buftype == 'help'
+    let w:airline_section_x = ''
+    let w:airline_section_y = ''
+    let w:airline_render_right = 1
+  endif
+
+  for item in items(s:filetype_regex_overrides)
+    if match(&ft, item[0]) >= 0
+      call airline#extensions#apply_left_override(item[1][0], item[1][1])
+    endif
   endfor
 endfunction
 
-function! airline#extensions#apply_window_overrides()
-  if &ft == 'netrw'
-    call s:override_left_only('netrw', '%f')
-  elseif &ft == 'unite'
-    call s:override_left_only('Unite', unite#get_status_string())
-  elseif &ft == 'nerdtree'
-    call s:override_left_only('NERD', '')
-  elseif &ft == 'undotree'
-    call s:override_left_only('undotree', '')
-  elseif &ft == 'gundo'
-    call s:override_left_only('Gundo', '')
-  elseif &ft == 'diff'
-    call s:override_left_only('diff', '')
-  elseif &ft == 'tagbar'
-    call s:override_left_only('Tagbar', '')
-  elseif &ft == 'minibufexpl'
-    call s:override_left_only('MiniBufExplorer', '')
+function! s:is_excluded_window()
+  for matchft in g:airline_exclude_filetypes
+    if matchft ==# &ft
+      return 1
+    endif
+  endfor
+
+  for matchw in g:airline_exclude_filenames
+    if matchstr(expand('%'), matchw) ==# matchw
+      return 1
+    endif
+  endfor
+
+  if g:airline_exclude_preview && &previewwindow
+    return 1
   endif
+
+  return 0
+endfunction
+
+function! airline#extensions#load_theme()
+  call airline#util#exec_funcrefs(s:ext._theme_funcrefs, g:airline#themes#{g:airline_theme}#palette)
 endfunction
 
 function! airline#extensions#load()
-  let g:unite_force_overwrite_statusline = 0
+  let s:loaded_ext = []
 
-  if exists('g:loaded_ctrlp') && g:loaded_ctrlp
-    call airline#extensions#ctrlp#load_ctrlp_hi()
-    let g:ctrlp_status_func = {
-          \ 'main': 'airline#extensions#ctrlp#ctrlp_airline',
-          \ 'prog': 'airline#extensions#ctrlp#ctrlp_airline_status',
-          \ }
+  if exists('g:airline_extensions')
+    for ext in g:airline_extensions
+      try
+        call airline#extensions#{ext}#init(s:ext)
+      catch /^Vim\%((\a\+)\)\=:E117/	" E117, function does not exist
+        call airline#util#warning("Extension '".ext."' not installed, ignoring!")
+        continue
+      endtry
+      call add(s:loaded_ext, ext)
+    endfor
+    return
+  endif
+
+  call airline#extensions#quickfix#init(s:ext)
+  call add(s:loaded_ext, 'quickfix')
+
+  if get(g:, 'loaded_unite', 0) && get(g:, 'airline#extensions#unite#enabled', 1)
+    call airline#extensions#unite#init(s:ext)
+    call add(s:loaded_ext, 'unite')
+  endif
+
+  if get(g:, 'loaded_denite', 0) && get(g:, 'airline#extensions#denite#enabled', 1)
+    call airline#extensions#denite#init(s:ext)
+    call add(s:loaded_ext, 'denite')
+  endif
+
+  if get(g:, 'loaded_gina', 0) && get(g:, 'airline#extensions#gina#enabled', 1)
+    call airline#extensions#gina#init(s:ext)
+    call add(s:loaded_ext, 'gina')
+  endif
+
+  if get(g:, 'fern_loaded', 0) && get(g:, 'airline#extensions#fern#enabled', 1)
+    call airline#extensions#fern#init(s:ext)
+    call add(s:loaded_ext, 'fern')
+  endif
+
+  if exists(':NetrwSettings')
+    call airline#extensions#netrw#init(s:ext)
+    call add(s:loaded_ext, 'netrw')
+  endif
+
+  " fzf buffers are also terminal buffers, so this must be above term.
+  if exists(':FZF') && get(g:, 'airline#extensions#fzf#enabled', 1)
+    call airline#extensions#fzf#init(s:ext)
+    call add(s:loaded_ext, 'fzf')
+  endif
+
+  " Vim-CMake buffers are also terminal buffers, so this must be above term.
+  if get(g:, 'loaded_cmake', 0) && get(g:, 'airline#extensions#vimcmake#enabled', 1)
+    call airline#extensions#vimcmake#init(s:ext)
+    call add(s:loaded_ext, 'vimcmake')
+  endif
+
+  if (has("terminal") || has('nvim')) &&
+        \ get(g:, 'airline#extensions#term#enabled', 1)
+    call airline#extensions#term#init(s:ext)
+    call add(s:loaded_ext, 'term')
+  endif
+
+  if get(g:, 'airline#extensions#ycm#enabled', 0) && exists('g:loaded_youcompleteme')
+    call airline#extensions#ycm#init(s:ext)
+    call add(s:loaded_ext, 'ycm')
+  endif
+
+  if get(g:, 'loaded_vimfiler', 0)
+    let g:vimfiler_force_overwrite_statusline = 0
+  endif
+
+  if get(g:, 'loaded_ctrlp', 0)
+    call airline#extensions#ctrlp#init(s:ext)
+    call add(s:loaded_ext, 'ctrlp')
+  endif
+
+  if get(g:, 'loaded_localsearch', 0)
+    call airline#extensions#localsearch#init(s:ext)
+    call add(s:loaded_ext, 'localsearch')
+  endif
+
+  if get(g:, 'CtrlSpaceLoaded', 0)
+    call airline#extensions#ctrlspace#init(s:ext)
+    call add(s:loaded_ext, 'ctrlspace')
+  endif
+
+  if get(g:, 'command_t_loaded', 0)
+    call airline#extensions#commandt#init(s:ext)
+    call add(s:loaded_ext, 'commandt')
+  endif
+
+  if exists(':UndotreeToggle')
+    call airline#extensions#undotree#init(s:ext)
+    call add(s:loaded_ext, 'undotree')
+  endif
+
+  if get(g:, 'airline#extensions#hunks#enabled', 1)
+        \ && (exists('g:loaded_signify')
+        \ || exists('g:loaded_gitgutter')
+        \ || exists('g:loaded_changes')
+        \ || exists('g:loaded_quickfixsigns')
+        \ || exists(':CocCommand'))
+    call airline#extensions#hunks#init(s:ext)
+    call add(s:loaded_ext, 'hunks')
+  endif
+
+  if get(g:, 'airline#extensions#vimagit#enabled', 1)
+        \ && (exists('g:loaded_magit'))
+    call airline#extensions#vimagit#init(s:ext)
+    call add(s:loaded_ext, 'vimagit')
+  endif
+
+  if get(g:, 'airline#extensions#tagbar#enabled', 1)
+        \ && exists(':TagbarToggle')
+    call airline#extensions#tagbar#init(s:ext)
+    call add(s:loaded_ext, 'tagbar')
+  endif
+
+  if get(g:, 'airline#extensions#vista#enabled', 1)
+        \ && exists(':Vista')
+    call airline#extensions#vista#init(s:ext)
+    call add(s:loaded_ext, 'vista')
+  endif
+
+  if get(g:, 'airline#extensions#bookmark#enabled', 1)
+        \ && exists(':BookmarkToggle')
+    call airline#extensions#bookmark#init(s:ext)
+    call add(s:loaded_ext, 'bookmark')
+  endif
+
+  if get(g:, 'airline#extensions#csv#enabled', 1)
+        \ && (get(g:, 'loaded_csv', 0) || exists(':Table'))
+    call airline#extensions#csv#init(s:ext)
+    call add(s:loaded_ext, 'csv')
+  endif
+
+  if get(g:, 'airline#extensions#zoomwintab#enabled', 0)
+    call airline#extensions#zoomwintab#init(s:ext)
+    call add(s:loaded_ext, 'zoomwintab')
+  endif
+
+  if exists(':VimShell')
+    let s:filetype_regex_overrides['^int-'] = ['vimshell','%{substitute(&ft, "int-", "", "")}']
+  endif
+
+  if get(g:, 'airline#extensions#branch#enabled', 1) && (
+          \ airline#util#has_fugitive() ||
+          \ airline#util#has_gina() ||
+          \ airline#util#has_lawrencium() ||
+          \ airline#util#has_vcscommand() ||
+          \ airline#util#has_custom_scm())
+    call airline#extensions#branch#init(s:ext)
+    call add(s:loaded_ext, 'branch')
+  endif
+
+  if get(g:, 'airline#extensions#bufferline#enabled', 1)
+        \ && exists('*bufferline#get_status_string')
+    call airline#extensions#bufferline#init(s:ext)
+    call add(s:loaded_ext, 'bufferline')
+  endif
+
+  if get(g:, 'airline#extensions#fugitiveline#enabled', 1)
+        \ && airline#util#has_fugitive()
+        \ && index(s:loaded_ext, 'bufferline') == -1
+    call airline#extensions#fugitiveline#init(s:ext)
+    call add(s:loaded_ext, 'fugitiveline')
+  endif
+
+  " NOTE: This means that if both virtualenv and poetv are enabled and
+  " available, poetv silently takes precedence and the virtualenv
+  " extension won't be initialized. Since both extensions currently just
+  " add a virtualenv identifier section to the airline, this seems
+  " acceptable.
+  if (get(g:, 'airline#extensions#poetv#enabled', 0) && (exists(':PoetvActivate')))
+    call airline#extensions#poetv#init(s:ext)
+    call add(s:loaded_ext, 'poetv')
+  elseif (get(g:, 'airline#extensions#virtualenv#enabled', 0) && (exists(':VirtualEnvList')))
+    call airline#extensions#virtualenv#init(s:ext)
+    call add(s:loaded_ext, 'virtualenv')
+  elseif (get(g:, 'airline#extensions#poetv#enabled', 0) && (isdirectory($VIRTUAL_ENV)))
+    call airline#extensions#poetv#init(s:ext)
+    call add(s:loaded_ext, 'poetv')
+  endif
+
+  if (get(g:, 'airline#extensions#eclim#enabled', 1) && exists(':ProjectCreate'))
+    call airline#extensions#eclim#init(s:ext)
+    call add(s:loaded_ext, 'eclim')
+  endif
+
+  if get(g:, 'airline#extensions#syntastic#enabled', 1)
+        \ && exists(':SyntasticCheck')
+    call airline#extensions#syntastic#init(s:ext)
+    call add(s:loaded_ext, 'syntastic')
+  endif
+
+  if (get(g:, 'airline#extensions#ale#enabled', 1) && exists(':ALELint'))
+    call airline#extensions#ale#init(s:ext)
+    call add(s:loaded_ext, 'ale')
+  endif
+
+  if (get(g:, 'airline#extensions#lsp#enabled', 1) && exists(':LspDeclaration'))
+    call airline#extensions#lsp#init(s:ext)
+    call add(s:loaded_ext, 'lsp')
+  endif
+
+  if (get(g:, 'airline#extensions#nvimlsp#enabled', 1)
+        \ && exists(':LspInstallInfo'))
+    call airline#extensions#nvimlsp#init(s:ext)
+    call add(s:loaded_ext, 'nvimlsp')
+  endif
+
+  if (get(g:, 'airline#extensions#coc#enabled', 1) && exists(':CocCommand'))
+    call airline#extensions#coc#init(s:ext)
+    call add(s:loaded_ext, 'coc')
+  endif
+
+  if (get(g:, 'airline#extensions#languageclient#enabled', 1) && exists(':LanguageClientStart'))
+    call airline#extensions#languageclient#init(s:ext)
+    call add(s:loaded_ext, 'languageclient')
+  endif
+
+  if get(g:, 'airline#extensions#whitespace#enabled', 1)
+    call airline#extensions#whitespace#init(s:ext)
+    call add(s:loaded_ext, 'whitespace')
+  endif
+
+  if (get(g:, 'airline#extensions#neomake#enabled', 1) && exists(':Neomake'))
+    call airline#extensions#neomake#init(s:ext)
+    call add(s:loaded_ext, 'neomake')
+  endif
+
+  if get(g:, 'airline#extensions#po#enabled', 1) && executable('msgfmt')
+    call airline#extensions#po#init(s:ext)
+    call add(s:loaded_ext, 'po')
+  endif
+
+  if get(g:, 'airline#extensions#wordcount#enabled', 1)
+    call airline#extensions#wordcount#init(s:ext)
+    call add(s:loaded_ext, 'wordcount')
+  endif
+
+  if get(g:, 'airline#extensions#tabline#enabled', 0)
+    call airline#extensions#tabline#init(s:ext)
+    call add(s:loaded_ext, 'tabline')
+  endif
+
+  if get(g:, 'airline#extensions#tmuxline#enabled', 1) && exists(':Tmuxline')
+    call airline#extensions#tmuxline#init(s:ext)
+    call add(s:loaded_ext, 'tmuxline')
+  endif
+
+  if get(g:, 'airline#extensions#promptline#enabled', 1) && exists(':PromptlineSnapshot') && len(get(g:, 'airline#extensions#promptline#snapshot_file', ''))
+    call airline#extensions#promptline#init(s:ext)
+    call add(s:loaded_ext, 'promptline')
+  endif
+
+  if get(g:, 'airline#extensions#nrrwrgn#enabled', 1) && get(g:, 'loaded_nrrw_rgn', 0)
+      call airline#extensions#nrrwrgn#init(s:ext)
+    call add(s:loaded_ext, 'nrrwrgn')
+  endif
+
+  if get(g:, 'airline#extensions#unicode#enabled', 1) && exists(':UnicodeTable') == 2
+      call airline#extensions#unicode#init(s:ext)
+    call add(s:loaded_ext, 'unicode')
+  endif
+
+  if (get(g:, 'airline#extensions#capslock#enabled', 1) && exists('*CapsLockStatusline'))
+    call airline#extensions#capslock#init(s:ext)
+    call add(s:loaded_ext, 'capslock')
+  endif
+
+  if (get(g:, 'airline#extensions#gutentags#enabled', 1) && get(g:, 'loaded_gutentags', 0))
+    call airline#extensions#gutentags#init(s:ext)
+    call add(s:loaded_ext, 'gutentags')
+  endif
+
+  if get(g:, 'airline#extensions#gen_tags#enabled', 1) && (get(g:, 'loaded_gentags#gtags', 0) || get(g:, 'loaded_gentags#ctags', 0))
+    call airline#extensions#gen_tags#init(s:ext)
+    call add(s:loaded_ext, 'gen_tags')
+  endif
+
+  if (get(g:, 'airline#extensions#grepper#enabled', 1) && get(g:, 'loaded_grepper', 0))
+    call airline#extensions#grepper#init(s:ext)
+    call add(s:loaded_ext, 'grepper')
+  endif
+
+  if (get(g:, 'airline#extensions#xkblayout#enabled', 1) && exists('g:XkbSwitchLib'))
+    call airline#extensions#xkblayout#init(s:ext)
+    call add(s:loaded_ext, 'xkblayout')
+  endif
+
+  if (get(g:, 'airline#extensions#keymap#enabled', 1) && has('keymap'))
+    call airline#extensions#keymap#init(s:ext)
+    call add(s:loaded_ext, 'keymap')
+  endif
+
+  if (get(g:, 'airline#extensions#windowswap#enabled', 1) && get(g:, 'loaded_windowswap', 0))
+    call airline#extensions#windowswap#init(s:ext)
+    call add(s:loaded_ext, 'windowswap')
+  endif
+
+  if (get(g:, 'airline#extensions#obsession#enabled', 1) && exists('*ObsessionStatus'))
+    call airline#extensions#obsession#init(s:ext)
+    call add(s:loaded_ext, 'obsession')
+  endif
+
+  if get(g:, 'airline#extensions#vimtex#enabled', 1)
+    runtime autoload/vimtex.vim
+    if exists('*vimtex#init')
+      call airline#extensions#vimtex#init(s:ext)
+      call add(s:loaded_ext, 'vimtex')
+    endif
+  endif
+
+  if (get(g:, 'airline#extensions#cursormode#enabled', 0))
+    call airline#extensions#cursormode#init(s:ext)
+    call add(s:loaded_ext, 'cursormode')
+  endif
+
+  if get(g:, 'airline#extensions#searchcount#enabled', 1) && exists('*searchcount')
+    call airline#extensions#searchcount#init(s:ext)
+    call add(s:loaded_ext, 'searchcount')
+  endif
+
+  if get(g:, 'loaded_battery', 0) && get(g:, 'airline#extensions#battery#enabled', 0)
+    call airline#extensions#battery#init(s:ext)
+    call add(s:loaded_ext, 'battery')
+  endif
+
+  if !get(g:, 'airline#extensions#disable_rtp_load', 0)
+    " load all other extensions, which are not part of the default distribution.
+    " (autoload/airline/extensions/*.vim outside of our s:script_path).
+    for file in split(globpath(&rtp, "autoload/airline/extensions/*.vim"), "\n")
+      " we have to check both resolved and unresolved paths, since it's possible
+      " that they might not get resolved properly (see #187)
+      if stridx(tolower(resolve(fnamemodify(file, ':p'))), s:script_path) < 0
+            \ && stridx(tolower(fnamemodify(file, ':p')), s:script_path) < 0
+        let name = fnamemodify(file, ':t:r')
+        if !get(g:, 'airline#extensions#'.name.'#enabled', 1) ||
+            \ index(s:loaded_ext, name) > -1
+          continue
+        endif
+        try
+          call airline#extensions#{name}#init(s:ext)
+          " mark as external
+          call add(s:loaded_ext, name.'*')
+        catch
+        endtry
+      endif
+    endfor
+  endif
+
+  if exists(':Dirvish') && get(g:, 'airline#extensions#dirvish#enabled', 1)
+    call airline#extensions#dirvish#init(s:ext)
+    call add(s:loaded_ext, 'dirvish')
+  endif
+
+  if (get(g:, 'airline#extensions#omnisharp#enabled', 1) && get(g:, 'OmniSharp_loaded', 0))
+    call airline#extensions#omnisharp#init(s:ext)
+    call add(s:loaded_ext, 'omnisharp')
   endif
 
-  call add(g:airline_window_override_funcrefs, function('airline#extensions#apply_window_overrides'))
 endfunction
 
+function! airline#extensions#get_loaded_extensions()
+  return s:loaded_ext
+endfunction

autoload/airline/extensions/ale.vim

@@ -0,0 +1,134 @@
+" MIT License. Copyright (c) 2013-2020 Bjorn Neergaard, w0rp et al.
+" Plugin: https://github.com/dense-analysis/ale
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_ale_dont_use_this_in_other_plugins_please', 0)
+  finish
+endif
+
+function! s:airline_ale_count(cnt, symbol)
+  return a:cnt ? a:symbol. a:cnt : ''
+endfunction
+
+function! s:legacy_airline_ale_get_line_number(cnt, type) abort
+  " Before ALE introduced the FirstProblem API function, this is how
+  " airline would get the line numbers:
+  " 1. Get the whole loclist; 2. Filter it for the desired problem type.
+  " 3. Return the line number of the first element in the filtered list.
+  if a:cnt == 0
+    return ''
+  endif
+
+  let buffer       = bufnr('')
+  let problem_type = (a:type ==# 'error') ? 'E' : 'W'
+  let problems     = copy(ale#engine#GetLoclist(buffer))
+
+  call filter(problems, 'v:val.bufnr is buffer && v:val.type is# problem_type')
+
+  if empty(problems)
+    return ''
+  endif
+
+  let open_lnum_symbol  = get(g:, 'airline#extensions#ale#open_lnum_symbol', '(L')
+  let close_lnum_symbol = get(g:, 'airline#extensions#ale#close_lnum_symbol', ')')
+
+  return open_lnum_symbol . problems[0].lnum . close_lnum_symbol
+endfunction
+
+function! s:new_airline_ale_get_line_number(cnt, type) abort
+  " The FirstProblem call in ALE is a far more efficient way
+  " of obtaining line number data. If the installed ALE supports
+  " it, we should use this method of getting line data.
+  if a:cnt == 0
+    return ''
+  endif
+  let l:buffer = bufnr('')
+
+  " Try to get the first error from ALE.
+  let l:result = ale#statusline#FirstProblem(l:buffer, a:type)
+  if empty(l:result)
+    " If there are no errors then try and check for style errors.
+    let l:result =  ale#statusline#FirstProblem(l:buffer, 'style_' . a:type)
+  endif
+
+  if empty(l:result)
+      return ''
+  endif
+
+  let l:open_lnum_symbol  =
+    \ get(g:, 'airline#extensions#ale#open_lnum_symbol', '(L')
+  let l:close_lnum_symbol =
+    \ get(g:, 'airline#extensions#ale#close_lnum_symbol', ')')
+
+  return open_lnum_symbol . l:result.lnum . close_lnum_symbol
+endfunction
+
+function! s:airline_ale_get_line_number(cnt, type) abort
+  " Use the new ALE statusline API function if it is available.
+  if exists("*ale#statusline#FirstProblem")
+    return s:new_airline_ale_get_line_number(a:cnt, a:type)
+  endif
+
+  return s:legacy_airline_ale_get_line_number(a:cnt, a:type)
+endfunction
+
+function! airline#extensions#ale#get(type)
+  if !exists(':ALELint')
+    return ''
+  endif
+
+  let error_symbol = get(g:, 'airline#extensions#ale#error_symbol', 'E:')
+  let warning_symbol = get(g:, 'airline#extensions#ale#warning_symbol', 'W:')
+  let checking_symbol = get(g:, 'airline#extensions#ale#checking_symbol', '...')
+  let show_line_numbers = get(g:, 'airline#extensions#ale#show_line_numbers', 1)
+
+  let is_err = a:type ==# 'error'
+
+  if ale#engine#IsCheckingBuffer(bufnr('')) == 1
+    return is_err ? '' : checking_symbol
+  endif
+
+  let symbol = is_err ? error_symbol : warning_symbol
+
+  let counts = ale#statusline#Count(bufnr(''))
+  if type(counts) == type({}) && has_key(counts, 'error')
+    " Use the current Dictionary format.
+    let errors = counts.error + counts.style_error
+    let num = is_err ? errors : counts.total - errors
+  else
+    " Use the old List format.
+    let num = is_err ? counts[0] : counts[1]
+  endif
+
+  if show_line_numbers == 1
+    return s:airline_ale_count(num, symbol) . <sid>airline_ale_get_line_number(num, a:type)
+  else
+    return s:airline_ale_count(num, symbol)
+  endif
+endfunction
+
+function! airline#extensions#ale#get_warning()
+  return airline#extensions#ale#get('warning')
+endfunction
+
+function! airline#extensions#ale#get_error()
+  return airline#extensions#ale#get('error')
+endfunction
+
+function! airline#extensions#ale#init(ext)
+  call airline#parts#define_function('ale_error_count', 'airline#extensions#ale#get_error')
+  call airline#parts#define_function('ale_warning_count', 'airline#extensions#ale#get_warning')
+  augroup airline_ale
+    autocmd!
+    autocmd CursorHold,BufWritePost * call <sid>ale_refresh()
+    autocmd User ALEJobStarted,ALELintPost call <sid>ale_refresh()
+  augroup END
+endfunction
+
+function! s:ale_refresh()
+  if get(g:, 'airline_skip_empty_sections', 0)
+    exe ':AirlineRefresh!'
+  endif
+endfunction

autoload/airline/extensions/battery.vim

@@ -0,0 +1,23 @@
+" MIT License. Copyright (c) 2014-2020 Mathias Andersson et al.
+" Plugin: https://github.com/lambdalisue/battery.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists('g:loaded_battery')
+  finish
+endif
+
+function! airline#extensions#battery#status(...) abort
+  if !exists('g:battery#update_statusline')
+    let g:battery#update_statusline = 1
+    call battery#update()
+  endif
+
+  let bat = battery#component()
+  return bat
+endfunction
+
+function! airline#extensions#battery#init(ext) abort
+  call airline#parts#define_function('battery', 'airline#extensions#battery#status')
+endfunction

autoload/airline/extensions/bookmark.vim

@@ -0,0 +1,30 @@
+" MIT License. Copyright (c) 2020 Bjoern Petri <bjoern.petri@sundevil.de>
+" Plugin: https://github.com/MattesGroeger/vim-bookmarks
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists(':BookmarkToggle')
+  finish
+endif
+
+function! airline#extensions#bookmark#currentbookmark() abort
+  if get(w:, 'airline_active', 0)
+    let file = expand('%:p')
+    if file ==# ''
+      return
+    endif
+
+    let current_line = line('.')
+    let has_bm = bm#has_bookmark_at_line(file, current_line)
+    let bm = has_bm ? bm#get_bookmark_by_line(file, current_line) : 0
+    let annotation = has_bm ? bm['annotation'] : ''
+
+    return annotation
+  endif
+  return ''
+endfunction
+
+function! airline#extensions#bookmark#init(ext) abort
+  call airline#parts#define_function('bookmark', 'airline#extensions#bookmark#currentbookmark')
+endfunction

autoload/airline/extensions/branch.vim

@@ -0,0 +1,349 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: fugitive, gina, lawrencium and vcscommand
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+" s:vcs_config contains static configuration of VCSes and their status relative
+" to the active file.
+" 'branch'    - The name of currently active branch. This field is empty iff it
+"               has not been initialized yet or the current file is not in
+"               an active branch.
+" 'untracked' - Cache of untracked files represented as a dictionary with files
+"               as keys. A file has a not exists symbol set as its value if it
+"               is untracked. A file is present in this dictionary iff its
+"               status is considered up to date.
+" 'untracked_mark' - used as regexp to test against the output of 'cmd'
+let s:vcs_config = {
+\  'git': {
+\    'exe': 'git',
+\    'cmd': 'git status --porcelain -- ',
+\    'dirty': 'git status -uno --porcelain --ignore-submodules',
+\    'untracked_mark': '??',
+\    'exclude': '\.git',
+\    'update_branch': 's:update_git_branch',
+\    'display_branch': 's:display_git_branch',
+\    'branch': '',
+\    'untracked': {},
+\  },
+\  'mercurial': {
+\    'exe': 'hg',
+\    'cmd': 'hg status -u -- ',
+\    'dirty': 'hg status -mard',
+\    'untracked_mark': '?',
+\    'exclude': '\.hg',
+\    'update_branch': 's:update_hg_branch',
+\    'display_branch': 's:display_hg_branch',
+\    'branch': '',
+\    'untracked': {},
+\  },
+\}
+
+" Initializes b:buffer_vcs_config. b:buffer_vcs_config caches the branch and
+" untracked status of the file in the buffer. Caching those fields is necessary,
+" because s:vcs_config may be updated asynchronously and s:vcs_config fields may
+" be invalid during those updates. b:buffer_vcs_config fields are updated
+" whenever corresponding fields in s:vcs_config are updated or an inconsistency
+" is detected during update_* operation.
+"
+" b:airline_head caches the head string it is empty iff it needs to be
+" recalculated. b:airline_head is recalculated based on b:buffer_vcs_config.
+function! s:init_buffer()
+  let b:buffer_vcs_config = {}
+  for vcs in keys(s:vcs_config)
+    let b:buffer_vcs_config[vcs] = {
+          \     'branch': '',
+          \     'untracked': '',
+          \     'dirty': 0,
+          \   }
+  endfor
+  unlet! b:airline_head
+endfunction
+
+let s:head_format = get(g:, 'airline#extensions#branch#format', 0)
+if s:head_format == 1
+  function! s:format_name(name)
+    return fnamemodify(a:name, ':t')
+  endfunction
+elseif s:head_format == 2
+  function! s:format_name(name)
+    return pathshorten(a:name)
+  endfunction
+elseif type(s:head_format) == type('')
+  function! s:format_name(name)
+    return call(s:head_format, [a:name])
+  endfunction
+else
+  function! s:format_name(name)
+    return a:name
+  endfunction
+endif
+
+
+" Fugitive special revisions. call '0' "staging" ?
+let s:names = {'0': 'index', '1': 'orig', '2':'fetch', '3':'merge'}
+let s:sha1size = get(g:, 'airline#extensions#branch#sha1_len', 7)
+
+function! s:update_git_branch()
+  call airline#util#ignore_next_focusgain()
+  if !airline#util#has_fugitive() && !airline#util#has_gina()
+    let s:vcs_config['git'].branch = ''
+    return
+  endif
+  if airline#util#has_fugitive()
+    let s:vcs_config['git'].branch = exists("*FugitiveHead") ?
+          \ FugitiveHead(s:sha1size) : fugitive#head(s:sha1size)
+    if s:vcs_config['git'].branch is# 'master' &&
+          \ airline#util#winwidth() < 81
+      " Shorten default a bit
+      let s:vcs_config['git'].branch='mas'
+    endif
+  else
+    try
+      let g:gina#component#repo#commit_length = s:sha1size
+      let s:vcs_config['git'].branch = gina#component#repo#branch()
+    catch
+    endtry
+    if s:vcs_config['git'].branch is# 'master' &&
+          \ airline#util#winwidth() < 81
+      " Shorten default a bit
+      let s:vcs_config['git'].branch='mas'
+    endif
+  endif
+endfunction
+
+function! s:display_git_branch()
+  " disable FocusGained autocommand, might cause loops because system() causes
+  " a refresh, which causes a system() command again #2029
+  call airline#util#ignore_next_focusgain()
+  let name = b:buffer_vcs_config['git'].branch
+  try
+    let commit = matchstr(FugitiveParse()[0], '^\x\+')
+
+    if has_key(s:names, commit)
+      let name = get(s:names, commit)."(".name.")"
+    elseif !empty(commit)
+      let ref = fugitive#repo().git_chomp('describe', '--all', '--exact-match', commit)
+      if ref !~ "^fatal: no tag exactly matches"
+        let name = s:format_name(substitute(ref, '\v\C^%(heads/|remotes/|tags/)=','',''))."(".name.")"
+      else
+        let name = matchstr(commit, '.\{'.s:sha1size.'}')."(".name.")"
+      endif
+    endif
+  catch
+  endtry
+  return name
+endfunction
+
+function! s:update_hg_branch()
+  if airline#util#has_lawrencium()
+    let cmd='LC_ALL=C hg qtop'
+    let stl=lawrencium#statusline()
+    let file=expand('%:p')
+    if !empty(stl) && get(b:, 'airline_do_mq_check', 1)
+      if g:airline#init#vim_async
+        noa call airline#async#get_mq_async(cmd, file)
+      elseif has("nvim")
+        noa call airline#async#nvim_get_mq_async(cmd, file)
+      else
+        " remove \n at the end of the command
+        let output=system(cmd)[0:-2]
+        noa call airline#async#mq_output(output, file)
+      endif
+    endif
+    " do not do mq check anymore
+    let b:airline_do_mq_check = 0
+    if exists("b:mq") && !empty(b:mq)
+      if stl is# 'default'
+        " Shorten default a bit
+        let stl='def'
+      endif
+      let stl.=' ['.b:mq.']'
+    endif
+    let s:vcs_config['mercurial'].branch = stl
+  else
+    let s:vcs_config['mercurial'].branch = ''
+  endif
+endfunction
+
+function! s:display_hg_branch()
+  return b:buffer_vcs_config['mercurial'].branch
+endfunction
+
+function! s:update_branch()
+  for vcs in keys(s:vcs_config)
+    call {s:vcs_config[vcs].update_branch}()
+    if b:buffer_vcs_config[vcs].branch != s:vcs_config[vcs].branch
+      let b:buffer_vcs_config[vcs].branch = s:vcs_config[vcs].branch
+      unlet! b:airline_head
+    endif
+  endfor
+endfunction
+
+function! airline#extensions#branch#update_untracked_config(file, vcs)
+  if !has_key(s:vcs_config[a:vcs].untracked, a:file)
+    return
+  elseif s:vcs_config[a:vcs].untracked[a:file] != b:buffer_vcs_config[a:vcs].untracked
+    let b:buffer_vcs_config[a:vcs].untracked = s:vcs_config[a:vcs].untracked[a:file]
+    unlet! b:airline_head
+  endif
+endfunction
+
+function! s:update_untracked()
+  let file = expand("%:p")
+  if empty(file) || isdirectory(file) || !empty(&buftype)
+    return
+  endif
+
+  let needs_update = 1
+  let vcs_checks   = get(g:, "airline#extensions#branch#vcs_checks", ["untracked", "dirty"])
+  for vcs in keys(s:vcs_config)
+    if file =~ s:vcs_config[vcs].exclude
+      " Skip check for files that live in the exclude directory
+      let needs_update = 0
+    endif
+    if has_key(s:vcs_config[vcs].untracked, file)
+      let needs_update = 0
+      call airline#extensions#branch#update_untracked_config(file, vcs)
+    endif
+  endfor
+
+  if !needs_update
+    return
+  endif
+
+  for vcs in keys(s:vcs_config)
+    " only check, for git, if fugitive is installed
+    " and for 'hg' if lawrencium is installed, else skip
+    if vcs is# 'git' && (!airline#util#has_fugitive() && !airline#util#has_gina())
+      continue
+    elseif vcs is# 'mercurial' && !airline#util#has_lawrencium()
+      continue
+    endif
+    let config = s:vcs_config[vcs]
+    " Note that asynchronous update updates s:vcs_config only, and only
+    " s:update_untracked updates b:buffer_vcs_config. If s:vcs_config is
+    " invalidated again before s:update_untracked is called, then we lose the
+    " result of the previous call, i.e. the head string is not updated. It
+    " doesn't happen often in practice, so we let it be.
+    if index(vcs_checks, 'untracked') > -1
+      call airline#async#vcs_untracked(config, file, vcs)
+    endif
+    " Check clean state of repo
+    if index(vcs_checks, 'dirty') > -1
+      call airline#async#vcs_clean(config.dirty, file, vcs)
+    endif
+  endfor
+endfunction
+
+function! airline#extensions#branch#head()
+  if !exists('b:buffer_vcs_config')
+    call s:init_buffer()
+  endif
+
+  call s:update_branch()
+  call s:update_untracked()
+
+  if exists('b:airline_head') && !empty(b:airline_head)
+    return b:airline_head
+  endif
+
+  let b:airline_head = ''
+  let vcs_priority = get(g:, "airline#extensions#branch#vcs_priority", ["git", "mercurial"])
+
+  let heads = []
+  for vcs in vcs_priority
+    if !empty(b:buffer_vcs_config[vcs].branch)
+      let heads += [vcs]
+    endif
+  endfor
+
+  for vcs in heads
+    if !empty(b:airline_head)
+      let b:airline_head .= ' | '
+    endif
+    if len(heads) > 1
+      let b:airline_head .= s:vcs_config[vcs].exe .':'
+    endif
+    let b:airline_head .= s:format_name({s:vcs_config[vcs].display_branch}())
+    let additional = b:buffer_vcs_config[vcs].untracked
+    if empty(additional) &&
+          \ has_key(b:buffer_vcs_config[vcs], 'dirty') &&
+          \ b:buffer_vcs_config[vcs].dirty
+      let additional = g:airline_symbols['dirty']
+    endif
+    let b:airline_head .= additional
+  endfor
+
+  if empty(heads)
+    if airline#util#has_vcscommand()
+      noa call VCSCommandEnableBufferSetup()
+      if exists('b:VCSCommandBufferInfo')
+        let b:airline_head = s:format_name(get(b:VCSCommandBufferInfo, 0, ''))
+      endif
+    endif
+  endif
+
+  if empty(heads)
+    if airline#util#has_custom_scm()
+      try
+        let Fn = function(g:airline#extensions#branch#custom_head)
+        let b:airline_head = Fn()
+      endtry
+    endif
+  endif
+
+  if exists("g:airline#extensions#branch#displayed_head_limit")
+    let w:displayed_head_limit = g:airline#extensions#branch#displayed_head_limit
+    if strwidth(b:airline_head) > w:displayed_head_limit - 1
+      let b:airline_head =
+            \ airline#util#strcharpart(b:airline_head, 0, w:displayed_head_limit - 1)
+            \ . (&encoding ==? 'utf-8' ?  '…' : '.')
+    endif
+  endif
+
+  return b:airline_head
+endfunction
+
+function! airline#extensions#branch#get_head()
+  let head = airline#extensions#branch#head()
+  let winwidth = get(airline#parts#get('branch'), 'minwidth', 120)
+  let minwidth = empty(get(b:, 'airline_hunks', '')) ? 14 : 7
+  let head = airline#util#shorten(head, winwidth, minwidth)
+  let symbol = get(g:, 'airline#extensions#branch#symbol', g:airline_symbols.branch)
+  return empty(head)
+        \ ? get(g:, 'airline#extensions#branch#empty_message', '')
+        \ : printf('%s%s', empty(symbol) ? '' : symbol.(g:airline_symbols.space), head)
+endfunction
+
+function! s:reset_untracked_cache(shellcmdpost)
+  " shellcmdpost - whether function was called as a result of ShellCmdPost hook
+  if !g:airline#init#vim_async && !has('nvim')
+    if a:shellcmdpost
+      " Clear cache only if there was no error or the script uses an
+      " asynchronous interface. Otherwise, cache clearing would overwrite
+      " v:shell_error with a system() call inside get_*_untracked.
+      if v:shell_error
+        return
+      endif
+    endif
+  endif
+
+  let file = expand("%:p")
+  for vcs in keys(s:vcs_config)
+    " Dump the value of the cache for the current file. Partially mitigates the
+    " issue of cache invalidation happening before a call to
+    " s:update_untracked()
+    call airline#extensions#branch#update_untracked_config(file, vcs)
+    let s:vcs_config[vcs].untracked = {}
+  endfor
+endfunction
+
+function! airline#extensions#branch#init(ext)
+  call airline#parts#define_function('branch', 'airline#extensions#branch#get_head')
+
+  autocmd ShellCmdPost,CmdwinLeave * unlet! b:airline_head b:airline_do_mq_check
+  autocmd User AirlineBeforeRefresh unlet! b:airline_head b:airline_do_mq_check
+  autocmd BufWritePost * call s:reset_untracked_cache(0)
+  autocmd ShellCmdPost * call s:reset_untracked_cache(1)
+endfunction

autoload/airline/extensions/bufferline.vim

@@ -0,0 +1,28 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/bling/vim-bufferline
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists('*bufferline#get_status_string')
+  finish
+endif
+
+function! airline#extensions#bufferline#init(ext)
+  if get(g:, 'airline#extensions#bufferline#overwrite_variables', 1)
+    highlight bufferline_selected gui=bold cterm=bold term=bold
+    highlight link bufferline_selected_inactive airline_c_inactive
+    let g:bufferline_inactive_highlight = 'airline_c'
+    let g:bufferline_active_highlight = 'bufferline_selected'
+    let g:bufferline_active_buffer_left = ''
+    let g:bufferline_active_buffer_right = ''
+    let g:bufferline_separator = g:airline_symbols.space
+  endif
+
+  if exists("+autochdir") && &autochdir == 1
+    " if 'acd' is set, vim-airline uses the path section, so we need ot redefine this here as well
+    call airline#parts#define_raw('path', '%{bufferline#refresh_status()}'.bufferline#get_status_string())
+  else
+    call airline#parts#define_raw('file', '%{bufferline#refresh_status()}'.bufferline#get_status_string())
+  endif
+endfunction

autoload/airline/extensions/capslock.vim

@@ -0,0 +1,17 @@
+" MIT License. Copyright (c) 2014-2020 Mathias Andersson et al.
+" Plugin: https://github.com/tpope/vim-capslock
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists('*CapsLockStatusline')
+  finish
+endif
+
+function! airline#extensions#capslock#status()
+  return tolower(CapsLockStatusline()) ==# '[caps]' ? get(g:, 'airline#extensions#capslock#symbol', 'CAPS') : ''
+endfunction
+
+function! airline#extensions#capslock#init(ext)
+  call airline#parts#define_function('capslock', 'airline#extensions#capslock#status')
+endfunction

autoload/airline/extensions/coc.vim

@@ -0,0 +1,54 @@
+" MIT License. Copyright (c) 2019-2020 Peng Guanwen et al.
+" vim: et ts=2 sts=2 sw=2
+" Plugin: https://github.com/neoclide/coc
+
+scriptencoding utf-8
+
+let s:error_symbol = get(g:, 'airline#extensions#coc#error_symbol', 'E:')
+let s:warning_symbol = get(g:, 'airline#extensions#coc#warning_symbol', 'W:')
+
+function! airline#extensions#coc#get_warning() abort
+  return airline#extensions#coc#get('warning')
+endfunction
+
+function! airline#extensions#coc#get_error() abort
+  return airline#extensions#coc#get('error')
+endfunction
+
+function! airline#extensions#coc#get(type) abort
+  if !exists(':CocCommand')
+    return ''
+  endif
+  let _backup = get(g:, 'coc_stl_format', '')
+  let is_err = (a:type  is# 'error')
+  if is_err
+    let g:coc_stl_format = get(g:, 'airline#extensions#coc#stl_format_err', '%E{[%e(#%fe)]}')
+  else
+    let g:coc_stl_format = get(g:, 'airline#extensions#coc#stl_format_warn', '%W{[%w(#%fw)]}')
+  endif
+  let info = get(b:, 'coc_diagnostic_info', {})
+  if empty(info) | return '' | endif
+
+
+  let cnt = get(info, a:type, 0)
+  if !empty(_backup)
+    let g:coc_stl_format = _backup
+  endif
+
+  if empty(cnt)
+    return ''
+  else
+    return (is_err ? s:error_symbol : s:warning_symbol).cnt
+  endif
+endfunction
+
+function! airline#extensions#coc#get_status() abort
+  " Shorten text for windows < 91 characters
+  return airline#util#shorten(get(g:, 'coc_status', ''), 91, 9)
+endfunction
+
+function! airline#extensions#coc#init(ext) abort
+  call airline#parts#define_function('coc_error_count', 'airline#extensions#coc#get_error')
+  call airline#parts#define_function('coc_warning_count', 'airline#extensions#coc#get_warning')
+  call airline#parts#define_function('coc_status', 'airline#extensions#coc#get_status')
+endfunction

autoload/airline/extensions/commandt.vim

@@ -0,0 +1,19 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/wincent/command-t
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'command_t_loaded', 0)
+  finish
+endif
+
+function! airline#extensions#commandt#apply(...)
+  if bufname('%') ==# 'GoToFile'
+    call airline#extensions#apply_left_override('CommandT', '')
+  endif
+endfunction
+
+function! airline#extensions#commandt#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#commandt#apply')
+endfunction

autoload/airline/extensions/csv.vim

@@ -0,0 +1,33 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling, Christian Brabandt et al.
+" Plugin: https://github.com/chrisbra/csv.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_csv', 0) && !exists(':Table')
+  finish
+endif
+
+let s:column_display = get(g:, 'airline#extensions#csv#column_display', 'Number')
+
+function! airline#extensions#csv#get_column()
+  if exists('*CSV_WCol')
+    if s:column_display ==# 'Name'
+      return '['.CSV_WCol('Name').CSV_WCol().']'
+    else
+      return '['.CSV_WCol().']'
+    endif
+  endif
+  return ''
+endfunction
+
+function! airline#extensions#csv#apply(...)
+  if &ft ==# "csv"
+    call airline#extensions#prepend_to_section('gutter',
+          \ g:airline_left_alt_sep.' %{airline#extensions#csv#get_column()}')
+  endif
+endfunction
+
+function! airline#extensions#csv#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#csv#apply')
+endfunction

autoload/airline/extensions/ctrlp.vim

@@ -1,38 +1,82 @@
-" TODO: support loading color palette from g:airline_theme
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/ctrlpvim/ctrlp.vim
+" vim: et ts=2 sts=2 sw=2
 
-function! airline#extensions#ctrlp#load_ctrlp_hi()
-  hi! CtrlPdark ctermfg=189 ctermbg=55 guifg=#d7d7ff guibg=#5f00af
-  hi! CtrlPlight ctermfg=231 ctermbg=98 guifg=#ffffff guibg=#875fd7
-  hi! CtrlPwhite ctermfg=55 ctermbg=231 term=bold guifg=#5f00af guibg=#ffffff gui=bold
-  hi! CtrlParrow1 ctermfg=98 ctermbg=231 guifg=#875fd7 guibg=#ffffff
-  hi! CtrlParrow2 ctermfg=231 ctermbg=98 guifg=#ffffff guibg=#875fd7
-  hi! CtrlParrow3 ctermfg=98 ctermbg=55 guifg=#875fd7 guibg=#5f00af
-  hi! CtrlParrow4 ctermfg=231 ctermbg=55 guifg=#ffffff guibg=#5f00af
-  hi! CtrlParrow5 ctermfg=98 ctermbg=231 guifg=#875fd7 guibg=#ffffff
+scriptencoding utf-8
+
+if !get(g:, 'loaded_ctrlp', 0)
+  finish
+endif
+
+let s:color_template = get(g:, 'airline#extensions#ctrlp#color_template', 'insert')
+
+function! airline#extensions#ctrlp#generate_color_map(dark, light, white)
+  return {
+        \ 'CtrlPdark'   : a:dark,
+        \ 'CtrlPlight'  : a:light,
+        \ 'CtrlPwhite'  : a:white,
+        \ 'CtrlParrow1' : [ a:light[1] , a:white[1] , a:light[3] , a:white[3] , ''     ] ,
+        \ 'CtrlParrow2' : [ a:white[1] , a:light[1] , a:white[3] , a:light[3] , ''     ] ,
+        \ 'CtrlParrow3' : [ a:light[1] , a:dark[1]  , a:light[3] , a:dark[3]  , ''     ] ,
+        \ }
 endfunction
 
-" Recreate Ctrl-P status line with some slight modifications
+function! airline#extensions#ctrlp#load_theme(palette)
+  if exists('a:palette.ctrlp')
+    let theme = a:palette.ctrlp
+  else
+    let s:color_template = has_key(a:palette, s:color_template) ? s:color_template : 'insert'
+    let theme = airline#extensions#ctrlp#generate_color_map(
+          \ a:palette[s:color_template]['airline_c'],
+          \ a:palette[s:color_template]['airline_b'],
+          \ a:palette[s:color_template]['airline_a'])
+  endif
+  for key in keys(theme)
+    call airline#highlighter#exec(key, theme[key])
+  endfor
+endfunction
 
-" Arguments: focus, byfname, s:regexp, prv, item, nxt, marked
-" a:1 a:2 a:3 a:4 a:5 a:6 a:7
+" Arguments: focus, byfname, regexp, prv, item, nxt, marked
 function! airline#extensions#ctrlp#ctrlp_airline(...)
-  let regex = a:3 ? '%#CtrlPlight#  regex %*' : ''
-  let prv = '%#CtrlPlight# '.a:4.' %#Ctrlparrow1#'.g:airline_left_sep
-  let item = '%#CtrlPwhite# '.a:5.' %#CtrlParrow2#'.g:airline_left_sep
-  let nxt = '%#CtrlPlight# '.a:6.' %#CtrlParrow3#'.g:airline_left_sep
-  let marked = '%#CtrlPdark# '.a:7.' '
-  let focus = '%=%<%#CtrlPdark# '.a:1.' %*'
-  let byfname = '%#CtrlParrow4#'.g:airline_right_alt_sep.'%#CtrlPdark# '.a:2.' %*'
-  let dir = '%#CtrlParrow3#'.g:airline_right_sep.'%#CtrlPlight# '.getcwd().' %*'
-  " Return the full statusline
-  return regex.prv.item.nxt.marked.focus.byfname.dir
+  let b = airline#builder#new({'active': 1})
+  if a:2 == 'file'
+    call b.add_section_spaced('CtrlPlight', 'by fname')
+  endif
+  if a:3
+    call b.add_section_spaced('CtrlPlight', 'regex')
+  endif
+  if get(g:, 'airline#extensions#ctrlp#show_adjacent_modes', 1)
+    call b.add_section_spaced('CtrlPlight', a:4)
+    call b.add_section_spaced('CtrlPwhite', a:5)
+    call b.add_section_spaced('CtrlPlight', a:6)
+  else
+    call b.add_section_spaced('CtrlPwhite', a:5)
+  endif
+  call b.add_section_spaced('CtrlPdark', a:7)
+  call b.split()
+  call b.add_section_spaced('CtrlPdark', a:1)
+  call b.add_section_spaced('CtrlPdark', a:2)
+  call b.add_section_spaced('CtrlPlight', '%{getcwd()}')
+  return b.build()
 endfunction
 
 " Argument: len
-" a:1
 function! airline#extensions#ctrlp#ctrlp_airline_status(...)
-  let len = '%#CtrlPwhite# '.a:1
-  let dir = '%=%<%#CtrlParrow5#'.g:airline_right_sep.'%#CtrlPlight# '.getcwd().' %*'
-  " Return the full statusline
+  let len = '%#CtrlPdark# '.a:1
+  let dir = '%=%<%#CtrlParrow3#'.g:airline_right_sep.'%#CtrlPlight# '.getcwd().' %*'
   return len.dir
 endfunction
+
+function! airline#extensions#ctrlp#apply(...)
+  " disable statusline overwrite if ctrlp already did it
+  return match(&statusline, 'CtrlPwhite') >= 0 ? -1 : 0
+endfunction
+
+function! airline#extensions#ctrlp#init(ext)
+  let g:ctrlp_status_func = {
+        \ 'main': 'airline#extensions#ctrlp#ctrlp_airline',
+        \ 'prog': 'airline#extensions#ctrlp#ctrlp_airline_status',
+        \ }
+  call a:ext.add_statusline_func('airline#extensions#ctrlp#apply')
+  call a:ext.add_theme_func('airline#extensions#ctrlp#load_theme')
+endfunction

autoload/airline/extensions/ctrlspace.vim

@@ -0,0 +1,21 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/szw/vim-ctrlspace
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#ctrlspace#statusline(...) abort
+  let spc = g:airline_symbols.space
+  let l:padding = spc . spc . spc
+  let cs = ctrlspace#context#Configuration().Symbols.CS
+
+  let b = airline#builder#new({ 'active': 1 })
+  call b.add_section('airline_b', cs . l:padding . ctrlspace#api#StatuslineModeSegment(l:padding))
+  call b.split()
+  call b.add_section('airline_x', spc . ctrlspace#api#StatuslineTabSegment() . spc)
+  return b.build()
+endfunction
+
+function! airline#extensions#ctrlspace#init(ext) abort
+  let g:CtrlSpaceStatuslineFunction = "airline#extensions#ctrlspace#statusline()"
+endfunction

autoload/airline/extensions/cursormode.vim

@@ -0,0 +1,122 @@
+" MIT Licsense.
+" Plugin: https://github.com/vheon/vim-cursormode
+" Copyright (C) 2014 Andrea Cedraro <a.cedraro@gmail.com>,
+" Copyright (C) 2017 Eduardo Suarez-Santana <e.suarezsantana@gmail.com>
+
+scriptencoding utf-8
+
+if exists('g:loaded_cursormode')
+  finish
+endif
+
+let g:loaded_cursormode = 1
+
+let s:is_win = has('win32') || has('win64')
+let s:is_iTerm = exists('$TERM_PROGRAM') && $TERM_PROGRAM =~# 'iTerm.app'
+let s:is_AppleTerminal = exists('$TERM_PROGRAM') && $TERM_PROGRAM =~# 'Apple_Terminal'
+
+let s:is_good = !has('gui_running') && !s:is_win && !s:is_AppleTerminal
+
+let s:last_mode = ''
+
+if !exists('g:cursormode_exit_mode')
+  let g:cursormode_exit_mode='n'
+endif
+
+function! airline#extensions#cursormode#tmux_escape(escape)
+  return '\033Ptmux;'.substitute(a:escape, '\\033', '\\033\\033', 'g').'\033\\'
+endfunction
+
+let s:iTerm_escape_template = '\033]Pl%s\033\\'
+let s:xterm_escape_template = '\033]12;%s\007'
+
+function! s:get_mode()
+  return call(get(g:, 'cursormode_mode_func', 'mode'), [])
+endfunction
+
+function! airline#extensions#cursormode#set(...)
+  let mode = s:get_mode()
+  if mode !=# s:last_mode
+    let s:last_mode = mode
+  call s:set_cursor_color_for(mode)
+  endif
+  return ''
+endfunction
+
+function! s:set_cursor_color_for(mode)
+  let mode = a:mode
+  for mode in [a:mode, a:mode.&background]
+    if has_key(s:color_map, mode)
+      try
+        let save_eventignore = &eventignore
+        set eventignore=all
+        let save_shelltemp = &shelltemp
+        set noshelltemp
+
+        silent call system(s:build_command(s:color_map[mode]))
+        return
+      finally
+        let &shelltemp = save_shelltemp
+        let &eventignore = save_eventignore
+      endtry
+    endif
+  endfor
+endfunction
+
+function! s:build_command(color)
+  if s:is_iTerm
+    let color = substitute(a:color, '^#', '', '')
+    let escape_template = s:iTerm_escape_template
+  else
+    let color = a:color
+    let escape_template = s:xterm_escape_template
+  endif
+
+  let escape = printf(escape_template, color)
+  if exists('$TMUX')
+    let escape = airline#extensions#cursormode#tmux_escape(escape)
+  endif
+  return "printf '".escape."' > /dev/tty"
+endfunction
+
+function! s:get_color_map()
+  if exists('g:cursormode_color_map')
+    return g:cursormode_color_map
+  endif
+
+  try
+    let map = g:cursormode#{g:colors_name}#color_map
+    return map
+  catch
+    return {
+          \   "nlight": "#000000",
+          \   "ndark":  "#BBBBBB",
+          \   "i":      "#0000BB",
+          \   "v":      "#FF5555",
+          \   "V":      "#BBBB00",
+          \   "\<C-V>": "#BB00BB",
+          \ }
+  endtry
+endfunction
+
+augroup airline#extensions#cursormode
+  autocmd!
+  autocmd VimLeave * nested call s:set_cursor_color_for(g:cursormode_exit_mode)
+  " autocmd VimEnter * call airline#extensions#cursormode#activate()
+  autocmd Colorscheme * call airline#extensions#cursormode#activate()
+augroup END
+
+function! airline#extensions#cursormode#activate()
+  let s:color_map = s:get_color_map()
+  call airline#extensions#cursormode#set()
+endfunction
+
+function! airline#extensions#cursormode#apply(...)
+  let w:airline_section_a = get(w:, 'airline_section_a', g:airline_section_a)
+  let w:airline_section_a .= '%{airline#extensions#cursormode#set()}'
+endfunction
+
+function! airline#extensions#cursormode#init(ext)
+  let s:color_map = s:get_color_map()
+  call a:ext.add_statusline_func('airline#extensions#cursormode#apply')
+endfunction

autoload/airline/extensions/default.vim

@@ -0,0 +1,100 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:section_use_groups     = get(g:, 'airline#extensions#default#section_use_groupitems', 1)
+let s:section_truncate_width = get(g:, 'airline#extensions#default#section_truncate_width', {
+      \ 'b': 79,
+      \ 'x': 60,
+      \ 'y': 88,
+      \ 'z': 45,
+      \ 'warning': 80,
+      \ 'error': 80,
+      \ })
+let s:layout = get(g:, 'airline#extensions#default#layout', [
+      \ [ 'a', 'b', 'c' ],
+      \ [ 'x', 'y', 'z', 'warning', 'error' ]
+      \ ])
+
+function! s:get_section(winnr, key, ...)
+  if has_key(s:section_truncate_width, a:key)
+    if airline#util#winwidth(a:winnr) < s:section_truncate_width[a:key]
+      return ''
+    endif
+  endif
+  let spc = g:airline_symbols.space
+  if !exists('g:airline_section_{a:key}')
+    return ''
+  endif
+  let text = airline#util#getwinvar(a:winnr, 'airline_section_'.a:key, g:airline_section_{a:key})
+  let [prefix, suffix] = [get(a:000, 0, '%('.spc), get(a:000, 1, spc.'%)')]
+  return empty(text) ? '' : prefix.text.suffix
+endfunction
+
+function! s:build_sections(builder, context, keys)
+  for key in a:keys
+    if (key == 'warning' || key == 'error') && !a:context.active
+      continue
+    endif
+    call s:add_section(a:builder, a:context, key)
+  endfor
+endfunction
+
+" There still is a highlighting bug when using groups %(%) in the statusline,
+" deactivate it, unless it is fixed (7.4.1511)
+if s:section_use_groups && (v:version >= 704 || (v:version >= 703 && has('patch81')))
+  function! s:add_section(builder, context, key)
+    let condition = (a:key is# "warning" || a:key is# "error") &&
+          \ (v:version == 704 && !has("patch1511"))
+    " i have no idea why the warning section needs special treatment, but it's
+    " needed to prevent separators from showing up
+    if ((a:key == 'error' || a:key == 'warning') && empty(s:get_section(a:context.winnr, a:key)))
+      return
+    endif
+    if condition
+      call a:builder.add_raw('%(')
+    endif
+    call a:builder.add_section('airline_'.a:key, s:get_section(a:context.winnr, a:key))
+    if condition
+      call a:builder.add_raw('%)')
+    endif
+  endfunction
+else
+  " older version don't like the use of %(%)
+  function! s:add_section(builder, context, key)
+    if ((a:key == 'error' || a:key == 'warning') && empty(s:get_section(a:context.winnr, a:key)))
+      return
+    endif
+    if a:key == 'warning'
+      call a:builder.add_raw('%#airline_warning#'.s:get_section(a:context.winnr, a:key))
+    elseif a:key == 'error'
+      call a:builder.add_raw('%#airline_error#'.s:get_section(a:context.winnr, a:key))
+    else
+      call a:builder.add_section('airline_'.a:key, s:get_section(a:context.winnr, a:key))
+    endif
+  endfunction
+endif
+
+function! airline#extensions#default#apply(builder, context)
+  let winnr = a:context.winnr
+  let active = a:context.active
+
+  if airline#util#getwinvar(winnr, 'airline_render_left', active || (!active && !g:airline_inactive_collapse))
+    call s:build_sections(a:builder, a:context, s:layout[0])
+  else
+    let text = s:get_section(winnr, 'c')
+    if empty(text)
+      let text = ' %f%m '
+    endif
+    call a:builder.add_section('airline_c'.(a:context.bufnr), text)
+  endif
+
+  call a:builder.split(s:get_section(winnr, 'gutter', '', ''))
+
+  if airline#util#getwinvar(winnr, 'airline_render_right', 1)
+    call s:build_sections(a:builder, a:context, s:layout[1])
+  endif
+
+  return 1
+endfunction

autoload/airline/extensions/denite.vim

@@ -0,0 +1,55 @@
+" MIT License. Copyright (c) 2017-2020 Thomas Dy et al.
+" Plugin: https://github.com/Shougo/denite.nvim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_denite', 0)
+  finish
+endif
+
+let s:denite_ver = (exists('*denite#get_status_mode') ? 2 : 3)
+" Denite does not use vim's built-in modal editing but has a custom prompt
+" that implements its own insert/normal mode so we have to handle changing the
+" highlight
+function! airline#extensions#denite#check_denite_mode(bufnr) abort
+  if &filetype !=# 'denite' && &filetype !=# 'denite-filter'
+    return ''
+  endif
+
+  if s:denite_ver == 3
+    let mode = split(denite#get_status("mode"), ' ')
+  else
+    let mode = split(denite#get_status_mode(), ' ')
+  endif
+  let mode = tolower(get(mode, 1, ''))
+  if !exists('b:denite_mode_cache') || mode != b:denite_mode_cache
+    call airline#highlighter#highlight([mode], a:bufnr)
+    let b:denite_mode_cache = mode
+  endif
+  return ''
+endfunction
+
+function! airline#extensions#denite#apply(...) abort
+  if &filetype ==# 'denite' || &filetype ==# 'denite-filter'
+    let w:airline_skip_empty_sections = 0
+    call a:1.add_section('airline_a', ' Denite %{airline#extensions#denite#check_denite_mode('.a:2['bufnr'].')}')
+    if s:denite_ver == 3
+      call a:1.add_section('airline_c', ' %{denite#get_status("sources")}')
+      call a:1.split()
+      call a:1.add_section('airline_y', ' %{denite#get_status("path")} ')
+      call a:1.add_section('airline_z', ' %{denite#get_status("linenr")} ')
+    else
+      call a:1.add_section('airline_c', ' %{denite#get_status_sources()}')
+      call a:1.split()
+      call a:1.add_section('airline_y', ' %{denite#get_status_path()} ')
+      call a:1.add_section('airline_z', ' %{denite#get_status_linenr()} ')
+    endif
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#denite#init(ext) abort
+  call denite#custom#option('_', 'statusline', 0)
+  call a:ext.add_statusline_func('airline#extensions#denite#apply')
+endfunction

autoload/airline/extensions/dirvish.vim

@@ -0,0 +1,36 @@
+" MIT Licsense
+" Plugin: https://github.com/justinmk/vim-dirvish
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_dirvish', 0)
+  finish
+endif
+
+let s:spc = g:airline_symbols.space
+
+function! airline#extensions#dirvish#init(ext) abort
+  call a:ext.add_statusline_func('airline#extensions#dirvish#apply')
+endfunction
+
+function! airline#extensions#dirvish#apply(...) abort
+  if &filetype ==# 'dirvish' && exists('b:dirvish')
+    let w:airline_section_a = 'Dirvish'
+
+    let w:airline_section_b = exists('*airline#extensions#branch#get_head')
+      \ ? '%{airline#extensions#branch#get_head()}'
+      \ : ''
+
+    let w:airline_section_c = '%{b:dirvish._dir}'
+
+    let w:airline_section_x = ''
+    let w:airline_section_y = ''
+
+    let current_column_regex = ':%\dv'
+    let w:airline_section_z = join(filter(
+      \   split(get(w:, 'airline_section_z', g:airline_section_z)),
+      \   'v:val !~ current_column_regex'
+      \ ))
+  endif
+endfunction

autoload/airline/extensions/eclim.vim

@@ -0,0 +1,62 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" PLugin: https://eclim.org
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists(':ProjectCreate')
+  finish
+endif
+
+function! airline#extensions#eclim#creat_line(...)
+  if &filetype == "tree"
+    let builder = a:1
+    call builder.add_section('airline_a', ' Project ')
+    call builder.add_section('airline_b', ' %f ')
+    call builder.add_section('airline_c', '')
+  return 1
+  endif
+endfunction
+
+function! airline#extensions#eclim#get_warnings()
+  " Cache vavlues, so that it isn't called too often
+  if exists("s:eclim_errors") &&
+    \  get(b:,  'airline_changenr', 0) == changenr()
+    return s:eclim_errors
+  endif
+  let eclimList = eclim#display#signs#GetExisting()
+  let s:eclim_errors = ''
+
+  if !empty(eclimList)
+    " Remove any non-eclim signs (see eclim#display#signs#Update)
+    " First check for just errors since they are more important.
+    " If there are no errors, then check for warnings.
+    let errorList = filter(copy(eclimList), 'v:val.name =~ "^\\(qf_\\)\\?\\(error\\)$"')
+
+    if (empty(errorList))
+      " use the warnings
+      call filter(eclimList, 'v:val.name =~ "^\\(qf_\\)\\?\\(warning\\)$"')
+      let type = 'W'
+    else
+      " Use the errors
+      let eclimList = errorList
+      let type = 'E'
+    endif
+
+    if !empty(eclimList)
+      let errorsLine = eclimList[0]['line']
+      let errorsNumber = len(eclimList)
+      let errors = "[Eclim:" . type . " line:".string(errorsLine)." (".string(errorsNumber).")]"
+      if !exists(':SyntasticCheck') || SyntasticStatuslineFlag() == ''
+        let s:eclim_errors = errors.(g:airline_symbols.space)
+      endif
+    endif
+  endif
+  let b:airline_changenr = changenr()
+  return s:eclim_errors
+endfunction
+
+function! airline#extensions#eclim#init(ext)
+  call airline#parts#define_function('eclim', 'airline#extensions#eclim#get_warnings')
+  call a:ext.add_statusline_func('airline#extensions#eclim#creat_line')
+endfunction

autoload/airline/extensions/example.vim

@@ -0,0 +1,55 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+" we don't actually want this loaded :P
+finish
+
+" Due to some potential rendering issues, the use of the `space` variable is
+" recommended.
+let s:spc = g:airline_symbols.space
+
+" Extension specific variables can be defined the usual fashion.
+if !exists('g:airline#extensions#example#number_of_cats')
+  let g:airline#extensions#example#number_of_cats = 42
+endif
+
+" First we define an init function that will be invoked from extensions.vim
+function! airline#extensions#example#init(ext)
+
+  " Here we define a new part for the plugin.  This allows users to place this
+  " extension in arbitrary locations.
+  call airline#parts#define_raw('cats', '%{airline#extensions#example#get_cats()}')
+
+  " Next up we add a funcref so that we can run some code prior to the
+  " statusline getting modifed.
+  call a:ext.add_statusline_func('airline#extensions#example#apply')
+
+  " You can also add a funcref for inactive statuslines.
+  " call a:ext.add_inactive_statusline_func('airline#extensions#example#unapply')
+endfunction
+
+" This function will be invoked just prior to the statusline getting modified.
+function! airline#extensions#example#apply(...)
+  " First we check for the filetype.
+  if &filetype == "nyancat"
+
+    " Let's say we want to append to section_c, first we check if there's
+    " already a window-local override, and if not, create it off of the global
+    " section_c.
+    let w:airline_section_c = get(w:, 'airline_section_c', g:airline_section_c)
+
+    " Then we just append this extenion to it, optionally using separators.
+    let w:airline_section_c .= s:spc.g:airline_left_alt_sep.s:spc.'%{airline#extensions#example#get_cats()}'
+  endif
+endfunction
+
+" Finally, this function will be invoked from the statusline.
+function! airline#extensions#example#get_cats()
+  let cats = ''
+  for i in range(1, g:airline#extensions#example#number_of_cats)
+    let cats .= ' (,,,)=(^.^)=(,,,) '
+  endfor
+  return cats
+endfunction

autoload/airline/extensions/fern.vim

@@ -0,0 +1,36 @@
+" MIT License. Copyright (c) 2013-2020
+" Plugin: https://github.com/lambdalisue/fern.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+if !get(g:, 'fern_loaded', 0)
+  finish
+endif
+
+function! airline#extensions#fern#apply(...) abort
+  if (&ft =~# 'fern')
+    let spc = g:airline_symbols.space
+    let fri = fern#fri#parse(expand('%f'))
+
+    call a:1.add_section('airline_a', spc.'fern'.spc)
+    if exists('*airline#extensions#branch#get_head')
+      call a:1.add_section('airline_b', spc.'%{airline#extensions#branch#get_head()}'.spc)
+    else
+      call a:1.add_section('airline_b', '')
+    endif
+    if !(fri.authority =~# '^drawer')
+      let abspath = substitute(fri.path, 'file://', '', '')
+      call a:1.add_section('airline_c', spc.fnamemodify(abspath, ':~'))
+      call a:1.split()
+      if len(get(g:, 'fern#comparators', {}))
+        call a:1.add_section('airline_y', spc.'%{fern#comparator}'.spc)
+      endif
+    endif
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#fern#init(ext) abort
+  let g:fern_force_overwrite_statusline = 0
+  call a:ext.add_statusline_func('airline#extensions#fern#apply')
+endfunction

autoload/airline/extensions/fugitiveline.vim

@@ -0,0 +1,52 @@
+" MIT License. Copyright (c) 2017-2020 Cimbali et al
+" Plugin: https://github.com/tpope/vim-fugitive
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !airline#util#has_fugitive()
+  finish
+endif
+
+function! s:ModifierFlags()
+  return (exists("+autochdir") && &autochdir) ? ':p' : ':.'
+endfunction
+
+function! airline#extensions#fugitiveline#bufname()
+  if !exists('b:fugitive_name')
+    let b:fugitive_name = ''
+    try
+      if bufname('%') =~? '^fugitive:' && exists('*FugitiveReal')
+        let b:fugitive_name = FugitiveReal(bufname('%'))
+      elseif exists('b:git_dir') && exists('*fugitive#repo')
+        if get(b:, 'fugitive_type', '') is# 'blob'
+          let b:fugitive_name = fugitive#repo().translate(FugitivePath(@%, ''))
+        endif
+      elseif exists('b:git_dir') && !exists('*fugitive#repo')
+        let buffer = fugitive#buffer()
+        if buffer.type('blob')
+          let b:fugitive_name = buffer.repo().translate(buffer.path('/'))
+        endif
+      endif
+    catch
+    endtry
+  endif
+
+  let fmod = s:ModifierFlags()
+  if empty(b:fugitive_name)
+    return fnamemodify(bufname('%'), fmod)
+  else
+    return fnamemodify(b:fugitive_name, fmod). " [git]"
+  endif
+endfunction
+
+function! airline#extensions#fugitiveline#init(ext)
+  if exists("+autochdir") && &autochdir
+    " if 'acd' is set, vim-airline uses the path section, so we need to redefine this here as well
+    call airline#parts#define_raw('path', '%<%{airline#extensions#fugitiveline#bufname()}%m')
+  else
+    call airline#parts#define_raw('file', '%<%{airline#extensions#fugitiveline#bufname()}%m')
+  endif
+  autocmd ShellCmdPost,CmdwinLeave * unlet! b:fugitive_name
+  autocmd User AirlineBeforeRefresh unlet! b:fugitive_name
+endfunction

autoload/airline/extensions/fzf.vim

@@ -0,0 +1,44 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/junegunn/fzf, https://github.com/junegunn/fzf.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#fzf#init(ext) abort
+  " Remove the custom statusline that fzf.vim sets by removing its `FileType
+  " fzf` autocmd. Ideally we'd use `let g:fzf_statusline = 0`, but this
+  " variable is checked *before* airline#extensions#init() is called.
+  augroup _fzf_statusline
+    autocmd!
+  augroup END
+
+  call a:ext.add_statusline_func('airline#extensions#fzf#apply')
+  call a:ext.add_inactive_statusline_func('airline#extensions#fzf#inactive_apply')
+endfunction
+
+function! airline#extensions#fzf#statusline(...) abort
+  let spc = g:airline_symbols.space
+
+  let builder = airline#builder#new({ 'active': 1 })
+  call builder.add_section('airline_a', spc.'FZF'.spc)
+  call builder.add_section('airline_c', '')
+  return builder.build()
+endfunction
+
+function! airline#extensions#fzf#apply(...) abort
+  if &filetype ==# 'fzf'
+    let spc = g:airline_symbols.space
+    call a:1.add_section('airline_a', spc.'FZF'.spc)
+    call a:1.add_section('airline_c', '')
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#fzf#inactive_apply(...) abort
+  if getbufvar(a:2.bufnr, '&filetype') ==# 'fzf'
+    let spc = g:airline_symbols.space
+    call a:1.add_section('airline_a', spc.'FZF'.spc)
+    call a:1.add_section('airline_c', '')
+    return 1
+  endif
+endfunction

autoload/airline/extensions/gen_tags.vim

@@ -0,0 +1,19 @@
+" MIT License. Copyright (c) 2014-2020 Mathias Andersson et al.
+" Written by Kamil Cukrowski 2020
+" Plugin: https://github.com/jsfaint/gen_tags.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !(get(g:, 'loaded_gentags#gtags', 0) || get(g:, 'loaded_gentags#ctags', 0))
+  finish
+endif
+
+function! airline#extensions#gen_tags#status(...) abort
+  return gen_tags#job#is_running() != 0 ? 'Gen. gen_tags' : ''
+endfunction
+
+function! airline#extensions#gen_tags#init(ext) abort
+  call airline#parts#define_function('gen_tags', 'airline#extensions#gen_tags#status')
+endfunction
+

autoload/airline/extensions/gina.vim

@@ -0,0 +1,24 @@
+" MIT License. Copyright (c) 2013-2020
+" Plugin: https://github.com/lambdalisue/gina.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+if !get(g:, 'loaded_gina', 0)
+  finish
+endif
+
+function! airline#extensions#gina#apply(...) abort
+  if (&ft =~# 'gina' && &ft !~# 'blame') || &ft ==# 'diff'
+    call a:1.add_section('airline_a', ' gina ')
+    call a:1.add_section('airline_b', ' %{gina#component#repo#branch()} ')
+    call a:1.split()
+    call a:1.add_section('airline_y', ' staged %{gina#component#status#staged()} ')
+    call a:1.add_section('airline_z', ' unstaged %{gina#component#status#unstaged()} ')
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#gina#init(ext) abort
+  let g:gina_force_overwrite_statusline = 0
+  call a:ext.add_statusline_func('airline#extensions#gina#apply')
+endfunction

autoload/airline/extensions/grepper.vim

@@ -0,0 +1,18 @@
+" MIT License. Copyright (c) 2014-2020 Mathias Andersson et al.
+" Plugin: https://github.com/mhinz/vim-grepper
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_grepper', 0)
+  finish
+endif
+
+function! airline#extensions#grepper#status()
+  let msg = grepper#statusline()
+  return empty(msg) ? '' : 'grepper'
+endfunction
+
+function! airline#extensions#grepper#init(ext)
+  call airline#parts#define_function('grepper', 'airline#extensions#grepper#status')
+endfunction

autoload/airline/extensions/gutentags.vim

@@ -0,0 +1,18 @@
+" MIT License. Copyright (c) 2014-2020 Mathias Andersson et al.
+" Plugin: https://github.com/ludovicchabant/vim-gutentags
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_gutentags', 0)
+  finish
+endif
+
+function! airline#extensions#gutentags#status()
+  let msg = gutentags#statusline()
+  return empty(msg) ? '' :  'Gen. ' . msg
+endfunction
+
+function! airline#extensions#gutentags#init(ext)
+  call airline#parts#define_function('gutentags', 'airline#extensions#gutentags#status')
+endfunction

autoload/airline/extensions/hunks.vim

@@ -0,0 +1,134 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: vim-gitgutter, vim-signify, changesPlugin, quickfixsigns, coc-git
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_signify', 0)
+  \ && !get(g:, 'loaded_gitgutter', 0)
+  \ && !get(g:, 'loaded_changes', 0)
+  \ && !get(g:, 'loaded_quickfixsigns', 0)
+  \ && !exists("*CocAction")
+  finish
+endif
+
+let s:non_zero_only = get(g:, 'airline#extensions#hunks#non_zero_only', 0)
+let s:hunk_symbols = get(g:, 'airline#extensions#hunks#hunk_symbols', ['+', '~', '-'])
+
+function! s:coc_git_enabled() abort
+  if !exists("*CocAction") ||
+   \ !get(g:, 'airline#extensions#hunks#coc_git', 0)
+     " coc-git extension is disabled by default
+     " unless specifically being enabled by the user
+     " (as requested from coc maintainer)
+    return 0
+  endif
+  return 1
+endfunction
+
+function! s:get_hunks_signify() abort
+  let hunks = sy#repo#get_stats()
+  if hunks[0] >= 0
+    return hunks
+  endif
+  return []
+endfunction
+
+function! s:get_hunks_coc() abort
+  let hunks = get(b:, 'coc_git_status', '')
+  if empty(hunks)
+    return []
+  endif
+  let result = [0, 0, 0]
+  for val in split(hunks)
+    if val[0] is# '+'
+     let result[0] = val[1:] + 0
+    elseif val[0] is# '~'
+     let result[1] = val[1:] + 0
+    elseif val[0] is# '-'
+      let result[2] = val[1:] + 0
+    endif
+  endfor
+  return result
+endfunction
+
+function! s:is_branch_empty() abort
+  return exists('*airline#extensions#branch#head') &&
+        \ empty(get(b:, 'airline_head', ''))
+endfunction
+
+function! s:get_hunks_gitgutter() abort
+  if !get(g:, 'gitgutter_enabled', 0) || s:is_branch_empty()
+    return ''
+  endif
+  return GitGutterGetHunkSummary()
+endfunction
+
+function! s:get_hunks_changes() abort
+  let hunks = changes#GetStats()
+  return hunks == [0, 0, 0] ? [] : hunks
+endfunction
+
+function! s:get_hunks_empty() abort
+  return ''
+endfunction
+
+function! airline#extensions#hunks#get_raw_hunks() abort
+  if !exists('b:source_func') || get(b:, 'source_func', '') is# 's:get_hunks_empty'
+    if get(g:, 'loaded_signify') && sy#buffer_is_active()
+      let b:source_func = 's:get_hunks_signify'
+    elseif exists('*GitGutterGetHunkSummary')
+      let b:source_func = 's:get_hunks_gitgutter'
+    elseif exists('*changes#GetStats')
+      let b:source_func = 's:get_hunks_changes'
+    elseif exists('*quickfixsigns#vcsdiff#GetHunkSummary')
+      let b:source_func = 'quickfixsigns#vcsdiff#GetHunkSummary'
+    elseif s:coc_git_enabled()
+      let b:source_func = 's:get_hunks_coc'
+    else
+      let b:source_func = 's:get_hunks_empty'
+    endif
+  endif
+  return {b:source_func}()
+endfunction
+
+function! airline#extensions#hunks#get_hunks() abort
+  if !get(w:, 'airline_active', 0)
+    return ''
+  endif
+  " Cache values, so that it isn't called too often
+  if exists("b:airline_hunks") &&
+    \ get(b:,  'airline_changenr', 0) == b:changedtick &&
+    \ airline#util#winwidth() == get(s:, 'airline_winwidth', 0) &&
+    \ get(b:, 'source_func', '') isnot# 's:get_hunks_signify' &&
+    \ get(b:, 'source_func', '') isnot# 's:get_hunks_gitgutter' &&
+    \ get(b:, 'source_func', '') isnot# 's:get_hunks_empty' &&
+    \ get(b:, 'source_func', '') isnot# 's:get_hunks_changes' &&
+    \ get(b:, 'source_func', '') isnot# 's:get_hunks_coc'
+    return b:airline_hunks
+  endif
+  let hunks = airline#extensions#hunks#get_raw_hunks()
+  let string = ''
+  let winwidth = get(airline#parts#get('hunks'), 'minwidth', 100)
+  if !empty(hunks)
+    " hunks should contain [added, changed, deleted]
+    for i in [0, 1, 2]
+      if (s:non_zero_only == 0 && airline#util#winwidth() > winwidth) || hunks[i] > 0
+        let string .= printf('%s%s ', s:hunk_symbols[i], hunks[i])
+      endif
+    endfor
+  endif
+  if index(airline#extensions#get_loaded_extensions(), 'branch') == -1 && string[-1:] == ' '
+    " branch extension not loaded, skip trailing whitespace
+    let string = string[0:-2]
+  endif
+
+  let b:airline_hunks = string
+  let b:airline_changenr = b:changedtick
+  let s:airline_winwidth = airline#util#winwidth()
+  return string
+endfunction
+
+function! airline#extensions#hunks#init(ext) abort
+  call airline#parts#define_function('hunks', 'airline#extensions#hunks#get_hunks')
+endfunction

autoload/airline/extensions/keymap.vim

@@ -0,0 +1,31 @@
+" MIT License. Copyright (c) 2013-2020 Doron Behar, C.Brabandt et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !has('keymap')
+  finish
+endif
+
+function! airline#extensions#keymap#status()
+  if (get(g:, 'airline#extensions#keymap#enabled', 1) && has('keymap'))
+    let short_codes = get(g:, 'airline#extensions#keymap#short_codes', {})
+    let label = get(g:, 'airline#extensions#keymap#label', g:airline_symbols.keymap)
+    let default = get(g:, 'airline#extensions#keymap#default', '')
+    if (label !=# '')
+      let label .= ' '
+    endif
+    let keymap = &keymap
+    if has_key(short_codes, keymap)
+      let keymap = short_codes[keymap]
+    endif
+    return printf('%s', (!empty(keymap) && &iminsert ? (label . keymap) :
+          \ (!empty(default) ? label . default : default)))
+  else
+    return ''
+  endif
+endfunction
+
+function! airline#extensions#keymap#init(ext)
+  call airline#parts#define_function('keymap', 'airline#extensions#keymap#status')
+endfunction

autoload/airline/extensions/languageclient.vim

@@ -0,0 +1,109 @@
+" MIT License. Copyright (c) 2013-2020 Bjorn Neergaard, hallettj et al.
+" Plugin: https://github.com/autozimu/LanguageClient-neovim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:error_symbol = get(g:, 'airline#extensions#languageclient#error_symbol', 'E:')
+let s:warning_symbol = get(g:, 'airline#extensions#languageclient#warning_symbol', 'W:')
+let s:show_line_numbers = get(g:, 'airline#extensions#languageclient#show_line_numbers', 1)
+
+" Severity codes from the LSP spec
+let s:severity_error = 1
+let s:severity_warning = 2
+let s:severity_info = 3
+let s:severity_hint = 4
+
+" After each LanguageClient state change `s:diagnostics` will be populated with
+" a map from file names to lists of errors, warnings, informational messages,
+" and hints.
+let s:diagnostics = {}
+
+function! s:languageclient_refresh()
+  if get(g:, 'airline_skip_empty_sections', 0)
+    exe ':AirlineRefresh!'
+  endif
+endfunction
+
+function! s:record_diagnostics(state)
+  " The returned message might not have the 'result' key
+  if has_key(a:state, 'result')
+    let result = json_decode(a:state.result)
+    let s:diagnostics = result.diagnostics
+  endif
+  call s:languageclient_refresh()
+endfunction
+
+function! s:get_diagnostics()
+  call LanguageClient#getState(function("s:record_diagnostics"))
+endfunction
+
+function! s:diagnostics_for_buffer()
+  return get(s:diagnostics, expand('%:p'), [])
+endfunction
+
+function! s:airline_languageclient_count(cnt, symbol)
+  return a:cnt ? a:symbol. a:cnt : ''
+endfunction
+
+function! s:airline_languageclient_get_line_number(type) abort
+  let linenumber_of_first_problem = 0
+  for d in s:diagnostics_for_buffer()
+    if has_key(d, 'severity') && d.severity == a:type
+      let linenumber_of_first_problem = d.range.start.line
+      break
+    endif
+  endfor
+
+  if linenumber_of_first_problem == 0
+    return ''
+  endif
+
+  let open_lnum_symbol  = get(g:, 'airline#extensions#languageclient#open_lnum_symbol', '(L')
+  let close_lnum_symbol = get(g:, 'airline#extensions#languageclient#close_lnum_symbol', ')')
+
+  return open_lnum_symbol . linenumber_of_first_problem . close_lnum_symbol
+endfunction
+
+function! airline#extensions#languageclient#get(type)
+  if get(b:, 'LanguageClient_isServerRunning', 0) ==# 0
+    return ''
+  endif
+
+  let is_err = a:type == s:severity_error
+  let symbol = is_err ? s:error_symbol : s:warning_symbol
+
+  let cnt = 0
+  for d in s:diagnostics_for_buffer()
+    if has_key(d, 'severity') && d.severity == a:type
+      let cnt += 1
+    endif
+  endfor
+
+  if cnt == 0
+    return ''
+  endif
+
+  if s:show_line_numbers == 1
+    return s:airline_languageclient_count(cnt, symbol) . <sid>airline_languageclient_get_line_number(a:type)
+  else
+    return s:airline_languageclient_count(cnt, symbol)
+  endif
+endfunction
+
+function! airline#extensions#languageclient#get_warning()
+  return airline#extensions#languageclient#get(s:severity_warning)
+endfunction
+
+function! airline#extensions#languageclient#get_error()
+  return airline#extensions#languageclient#get(s:severity_error)
+endfunction
+
+function! airline#extensions#languageclient#init(ext)
+  call airline#parts#define_function('languageclient_error_count', 'airline#extensions#languageclient#get_error')
+  call airline#parts#define_function('languageclient_warning_count', 'airline#extensions#languageclient#get_warning')
+  augroup airline_languageclient
+    autocmd!
+    autocmd User LanguageClientDiagnosticsChanged call <sid>get_diagnostics()
+  augroup END
+endfunction

autoload/airline/extensions/localsearch.vim

@@ -0,0 +1,41 @@
+" MIT License. Copyright (c) 2018-2020 mox et al.
+" Plugin: https://github.com/mox-mox/vim-localsearch
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:enabled = get(g:, 'airline#extensions#localsearch#enabled', 1)
+if !get(g:, 'loaded_localsearch', 0) || !s:enabled || get(g:, 'airline#extensions#localsearch#loaded', 0)
+  finish
+endif
+let g:airline#extensions#localsearch#loaded = 001
+
+let s:spc = g:airline_symbols.space
+
+let g:airline#extensions#localsearch#inverted = get(g:, 'airline#extensions#localsearch#inverted', 0)
+
+function! airline#extensions#localsearch#load_theme(palette) abort
+  call airline#highlighter#exec('localsearch_dark', [ '#ffffff' , '#000000' , 15  , 1 , ''])
+endfunction
+
+
+function! airline#extensions#localsearch#init(ext) abort
+  call a:ext.add_theme_func('airline#extensions#localsearch#load_theme')
+  call a:ext.add_statusline_func('airline#extensions#localsearch#apply')
+endfunction
+
+
+function! airline#extensions#localsearch#apply(...) abort
+  " first variable is the statusline builder
+  let builder = a:1
+
+  """"" WARNING: the API for the builder is not finalized and may change
+  if exists('#localsearch#WinEnter') && !g:airline#extensions#localsearch#inverted " If localsearch mode is enabled and 'invert' option is false
+    call builder.add_section('localsearch_dark', s:spc.airline#section#create('LS').s:spc)
+  endif
+  if !exists('#localsearch#WinEnter') && g:airline#extensions#localsearch#inverted " If localsearch mode is disabled and 'invert' option is true
+    call builder.add_section('localsearch_dark', s:spc.airline#section#create('GS').s:spc)
+  endif
+  return 0
+endfunction
+

autoload/airline/extensions/lsp.vim

@@ -0,0 +1,67 @@
+" MIT License. Copyright (c) 2013-2020 François-Xavier Carton et al.
+" Plugin: https://github.com/prabirshrestha/vim-lsp
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'lsp_loaded', 0)
+  finish
+endif
+
+function! s:airline_lsp_count(cnt, symbol) abort
+  return a:cnt ? a:symbol. a:cnt : ''
+endfunction
+
+function! s:airline_lsp_get_line_number(cnt, type) abort
+  let result = ''
+
+  if a:type ==# 'error'
+    let result = lsp#get_buffer_first_error_line()
+  endif
+
+  if empty(result)
+      return ''
+  endif
+
+  let open_lnum_symbol  =
+    \ get(g:, 'airline#extensions#lsp#open_lnum_symbol', '(L')
+  let close_lnum_symbol =
+    \ get(g:, 'airline#extensions#lsp#close_lnum_symbol', ')')
+
+  return open_lnum_symbol . result . close_lnum_symbol
+endfunction
+
+function! airline#extensions#lsp#get(type) abort
+  if !exists(':LspDeclaration')
+    return ''
+  endif
+
+  let error_symbol = get(g:, 'airline#extensions#lsp#error_symbol', 'E:')
+  let warning_symbol = get(g:, 'airline#extensions#lsp#warning_symbol', 'W:')
+  let show_line_numbers = get(g:, 'airline#extensions#lsp#show_line_numbers', 1)
+
+  let is_err = a:type ==# 'error'
+
+  let symbol = is_err ? error_symbol : warning_symbol
+
+  let num = lsp#get_buffer_diagnostics_counts()[a:type]
+
+  if show_line_numbers == 1
+    return s:airline_lsp_count(num, symbol) . <sid>airline_lsp_get_line_number(num, a:type)
+  else
+    return s:airline_lsp_count(num, symbol)
+  endif
+endfunction
+
+function! airline#extensions#lsp#get_warning() abort
+  return airline#extensions#lsp#get('warning')
+endfunction
+
+function! airline#extensions#lsp#get_error() abort
+  return airline#extensions#lsp#get('error')
+endfunction
+
+function! airline#extensions#lsp#init(ext) abort
+  call airline#parts#define_function('lsp_error_count', 'airline#extensions#lsp#get_error')
+  call airline#parts#define_function('lsp_warning_count', 'airline#extensions#lsp#get_warning')
+endfunction

autoload/airline/extensions/neomake.vim

@@ -0,0 +1,37 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/neomake/neomake
+" vim: et ts=2 sts=2 sw=2
+
+if !exists(':Neomake')
+  finish
+endif
+
+let s:error_symbol = get(g:, 'airline#extensions#neomake#error_symbol', 'E:')
+let s:warning_symbol = get(g:, 'airline#extensions#neomake#warning_symbol', 'W:')
+
+function! s:get_counts()
+  let l:counts = neomake#statusline#LoclistCounts()
+
+  if empty(l:counts)
+    return neomake#statusline#QflistCounts()
+  else
+    return l:counts
+  endif
+endfunction
+
+function! airline#extensions#neomake#get_warnings()
+  let counts = s:get_counts()
+  let warnings = get(counts, 'W', 0)
+  return warnings ? s:warning_symbol.warnings : ''
+endfunction
+
+function! airline#extensions#neomake#get_errors()
+  let counts = s:get_counts()
+  let errors = get(counts, 'E', 0)
+  return errors ? s:error_symbol.errors : ''
+endfunction
+
+function! airline#extensions#neomake#init(ext)
+  call airline#parts#define_function('neomake_warning_count', 'airline#extensions#neomake#get_warnings')
+  call airline#parts#define_function('neomake_error_count', 'airline#extensions#neomake#get_errors')
+endfunction

autoload/airline/extensions/netrw.vim

@@ -0,0 +1,35 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: http://www.drchip.org/astronaut/vim/#NETRW
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists(':NetrwSettings')
+  finish
+endif
+
+function! airline#extensions#netrw#apply(...)
+  if &ft == 'netrw'
+    let spc = g:airline_symbols.space
+
+    call a:1.add_section('airline_a', spc.'netrw'.spc)
+    if exists('*airline#extensions#branch#get_head')
+      call a:1.add_section('airline_b', spc.'%{airline#extensions#branch#get_head()}'.spc)
+    endif
+    call a:1.add_section('airline_c', spc.'%f'.spc)
+    call a:1.split()
+    call a:1.add_section('airline_y', spc.'%{airline#extensions#netrw#sortstring()}'.spc)
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#netrw#init(ext)
+  let g:netrw_force_overwrite_statusline = 0
+  call a:ext.add_statusline_func('airline#extensions#netrw#apply')
+endfunction
+
+
+function! airline#extensions#netrw#sortstring()
+  let order = (get(g:, 'netrw_sort_direction', 'n') =~ 'n') ? '+' : '-'
+  return get(g:, 'netrw_sort_by', '') . (g:airline_symbols.space) . '[' . order . ']'
+endfunction

autoload/airline/extensions/nrrwrgn.vim

@@ -0,0 +1,58 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling, Christian Brabandt et al.
+" Plugin: https://github.com/chrisbra/NrrwRgn
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_nrrw_rgn', 0)
+  finish
+endif
+
+function! airline#extensions#nrrwrgn#apply(...)
+  if exists(":WidenRegion") == 2
+    let spc = g:airline_symbols.space
+    if !exists("*nrrwrgn#NrrwRgnStatus()") || empty(nrrwrgn#NrrwRgnStatus())
+      call a:1.add_section('airline_a', printf('%s[Narrowed%s#%d]', spc, spc, b:nrrw_instn))
+      let bufname=(get(b:, 'orig_buf', 0) ? bufname(b:orig_buf) : substitute(bufname('%'), '^Nrrwrgn_\zs.*\ze_\d\+$', submatch(0), ''))
+      call a:1.add_section('airline_c', spc.bufname.spc)
+      call a:1.split()
+    else
+      let dict=nrrwrgn#NrrwRgnStatus()
+      let vmode = { 'v': 'Char ', 'V': 'Line ', '': 'Block '}
+      let mode = dict.visual ? vmode[dict.visual] : vmode['V']
+      let winwidth = airline#util#winwidth()
+      if winwidth < 80
+        let mode = mode[0]
+      endif
+      let title = (winwidth < 80 ? "Nrrw" : "Narrowed ")
+      let multi = (winwidth < 80 ? 'M' : 'Multi')
+      call a:1.add_section('airline_a', printf('[%s%s%s#%d]%s', (dict.multi ? multi : ""),
+        \ title, mode, b:nrrw_instn, spc))
+      let name = dict.fullname
+      if name !=# '[No Name]'
+        if winwidth > 100
+          " need some space
+          let name = fnamemodify(dict.fullname, ':~')
+          if strlen(name) > 8
+            " shorten name
+            let name = substitute(name, '\(.\)[^/\\]*\([/\\]\)', '\1\2', 'g')
+          endif
+        else
+          let name = fnamemodify(dict.fullname, ':t')
+        endif
+      endif
+      let range=(dict.multi ? '' : printf("[%d-%d]", dict.start[1], dict.end[1]))
+      call a:1.add_section('airline_c', printf("%s %s %s", name, range,
+        \ dict.enabled ? (&encoding ==? 'utf-8'  ? "\u2713"  : '')  : '!'))
+      call a:1.split()
+      call a:1.add_section('airline_x', get(g:, 'airline_section_x').spc)
+      call a:1.add_section('airline_y', spc.get(g:, 'airline_section_y').spc)
+      call a:1.add_section('airline_z', spc.get(g:, 'airline_section_z'))
+    endif
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#nrrwrgn#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#nrrwrgn#apply')
+endfunction

autoload/airline/extensions/nvimlsp.vim

@@ -0,0 +1,48 @@
+" Apache 2.0 license. Copyright (c) 2019-2020 Copyright Neovim contributors.
+" Plugin: https://github.com/neovim/nvim-lsp
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !(get(g:, 'airline#extensions#nvimlsp#enabled', 1)
+      \ && exists(':LspInstallInfo'))
+  finish
+endif
+
+function! s:airline_nvimlsp_count(cnt, symbol) abort
+  return a:cnt ? a:symbol. a:cnt : ''
+endfunction
+
+function! airline#extensions#nvimlsp#get(type) abort
+  if !exists(':LspInstallInfo')
+    return ''
+  endif
+
+  let error_symbol = get(g:, 'airline#extensions#nvimlsp#error_symbol', 'E:')
+  let warning_symbol = get(g:, 'airline#extensions#nvimlsp#warning_symbol', 'W:')
+
+  let is_err = a:type ==# 'Error'
+
+  let symbol = is_err ? error_symbol : warning_symbol
+
+  if luaeval("pcall(require, 'vim.lsp.diagnostic')")
+    let num = v:lua.vim.lsp.diagnostic.get_count(0, a:type)
+  else
+    let num = v:lua.vim.lsp.util.buf_diagnostics_count(a:type)
+  endif
+
+  return s:airline_nvimlsp_count(num, symbol)
+endfunction
+
+function! airline#extensions#nvimlsp#get_warning() abort
+  return airline#extensions#nvimlsp#get('Warning')
+endfunction
+
+function! airline#extensions#nvimlsp#get_error() abort
+  return airline#extensions#nvimlsp#get('Error')
+endfunction
+
+function! airline#extensions#nvimlsp#init(ext) abort
+  call airline#parts#define_function('nvimlsp_error_count', 'airline#extensions#nvimlsp#get_error')
+  call airline#parts#define_function('nvimlsp_warning_count', 'airline#extensions#nvimlsp#get_warning')
+endfunction

autoload/airline/extensions/obsession.vim

@@ -0,0 +1,23 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/tpope/vim-obsession
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists('*ObsessionStatus')
+  finish
+endif
+
+let s:spc = g:airline_symbols.space
+
+if !exists('g:airline#extensions#obsession#indicator_text')
+  let g:airline#extensions#obsession#indicator_text = '$'
+endif
+
+function! airline#extensions#obsession#init(ext)
+  call airline#parts#define_function('obsession', 'airline#extensions#obsession#get_status')
+endfunction
+
+function! airline#extensions#obsession#get_status()
+  return ObsessionStatus((g:airline#extensions#obsession#indicator_text . s:spc), '')
+endfunction

autoload/airline/extensions/omnisharp.vim

@@ -0,0 +1,45 @@
+" MIT License
+" Plugin: https://github.com/OmniSharp/omnisharp-vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'OmniSharp_loaded', 0)
+  finish
+endif
+
+function! airline#extensions#omnisharp#server_status(...) abort
+  if !exists(':OmniSharpGotoDefinition') || !get(g:, 'OmniSharp_server_stdio', 0)
+    return ''
+  endif
+
+  let host = OmniSharp#GetHost(bufnr('%'))
+  if type(host.job) != v:t_dict || get(host.job, 'stopped')
+    return ''
+  endif
+
+  let sln = fnamemodify(host.sln_or_dir, ':t')
+
+  if get(host.job, 'loaded', 0)
+    return sln
+  endif
+
+  try
+    let projectsloaded = OmniSharp#project#CountLoaded()
+    let projectstotal = OmniSharp#project#CountTotal()
+  catch
+    " The CountLoaded and CountTotal functions are very new - catch the error
+    " when they don't exist
+    let projectsloaded = 0
+    let projectstotal = 0
+  endtry
+  return printf('%s(%d/%d)', sln, projectsloaded, projectstotal)
+endfunction
+
+function! airline#extensions#omnisharp#init(ext) abort
+  call airline#parts#define_function('omnisharp', 'airline#extensions#omnisharp#server_status')
+  augroup airline_omnisharp
+    autocmd!
+    autocmd User OmniSharpStarted,OmniSharpReady,OmniSharpStopped AirlineRefresh!
+  augroup END
+endfunction

autoload/airline/extensions/po.vim

@@ -0,0 +1,94 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling, Christian Brabandt et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#po#shorten()
+  " Format and shorte the output of msgfmt
+  let b:airline_po_stats = substitute(get(b:, 'airline_po_stats', ''), ' \(message\|translation\)s*\.*', '', 'g')
+  let b:airline_po_stats = substitute(b:airline_po_stats, ', ', '/', 'g')
+  if exists("g:airline#extensions#po#displayed_limit")
+    let w:displayed_po_limit = g:airline#extensions#po#displayed_limit
+    if len(b:airline_po_stats) > w:displayed_po_limit - 1
+      let b:airline_po_stats = b:airline_po_stats[0:(w:displayed_po_limit - 2)].(&encoding==?'utf-8' ? '…' : '.')
+    endif
+  endif
+  if strlen(get(b:, 'airline_po_stats', '')) >= 30 && airline#util#winwidth() < 150
+    let fuzzy = ''
+    let untranslated = ''
+    let messages = ''
+    " Shorten [120 translated, 50 fuzzy, 4 untranslated] to [120T/50F/4U]
+    if b:airline_po_stats =~ 'fuzzy'
+      let fuzzy = substitute(b:airline_po_stats, '.\{-}\(\d\+\) fuzzy.*', '\1F', '')
+      if fuzzy == '0F'
+        let fuzzy = ''
+      endif
+    endif
+    if b:airline_po_stats =~ 'untranslated'
+      let untranslated = substitute(b:airline_po_stats, '.\{-}\(\d\+\) untranslated.*', '\1U', '')
+      if untranslated == '0U'
+        let untranslated = ''
+      endif
+    endif
+    let messages = substitute(b:airline_po_stats, '\(\d\+\) translated.*', '\1T', '')
+      if messages ==# '0T'
+        let messages = ''
+      endif
+    let b:airline_po_stats = printf('%s%s%s', fuzzy, (empty(fuzzy) || empty(untranslated) ? '' : '/'), untranslated)
+    if strlen(b:airline_po_stats) < 10
+      let b:airline_po_stats = messages. (!empty(b:airline_po_stats) && !empty(messages) ? '/':''). b:airline_po_stats
+    endif
+  endif
+  let b:airline_po_stats = '['.b:airline_po_stats. '] '
+endfunction
+
+function! airline#extensions#po#on_winenter()
+  " only reset cache, if the window size changed
+  if get(b:, 'airline_winwidth', 0) != airline#util#winwidth()
+    let b:airline_winwidth = airline#util#winwidth()
+    " needs re-formatting
+    unlet! b:airline_po_stats
+  endif
+endfunction
+
+function! airline#extensions#po#apply(...)
+  if &ft ==# 'po'
+    call airline#extensions#prepend_to_section('z', '%{airline#extensions#po#stats()}')
+    " Also reset the cache variable, if a window has been split, e.g. the winwidth changed
+    autocmd airline BufWritePost * unlet! b:airline_po_stats
+    autocmd airline WinEnter * call airline#extensions#po#on_winenter()
+  endif
+endfunction
+
+function! airline#extensions#po#stats()
+  if exists('b:airline_po_stats') && !empty(b:airline_po_stats)
+    return b:airline_po_stats
+  endif
+
+  if g:airline#init#is_windows
+    let cmd = 'msgfmt --statistics -o NUL '
+  else
+    let cmd = 'msgfmt --statistics -o /dev/null -- '
+  endif
+  if g:airline#init#vim_async
+    call airline#async#get_msgfmt_stat(cmd, expand('%:p'))
+  elseif has("nvim")
+    call airline#async#nvim_get_msgfmt_stat(cmd, expand('%:p'))
+  else
+    let airline_po_stats = system(cmd. shellescape(expand('%:p')))
+    if v:shell_error
+      return ''
+    endif
+    try
+      let b:airline_po_stats = split(airline_po_stats, '\n')[0]
+    catch
+      let b:airline_po_stats = ''
+    endtry
+    call airline#extensions#po#shorten()
+  endif
+  return get(b:, 'airline_po_stats', '')
+endfunction
+
+function! airline#extensions#po#init(ext)
+    call a:ext.add_statusline_func('airline#extensions#po#apply')
+endfunction

autoload/airline/extensions/poetv.vim

@@ -0,0 +1,32 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/petobens/poet_v
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:spc = g:airline_symbols.space
+
+function! airline#extensions#poetv#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#poetv#apply')
+endfunction
+
+function! airline#extensions#poetv#apply(...)
+  if &filetype =~# 'python'
+    if get(g:, 'poetv_loaded', 0)
+      let statusline = poetv#statusline()
+    else
+      let statusline = fnamemodify($VIRTUAL_ENV, ':t')
+    endif
+    if !empty(statusline)
+      call airline#extensions#append_to_section('x',
+            \ s:spc.g:airline_right_alt_sep.s:spc.statusline)
+    endif
+  endif
+endfunction
+
+function! airline#extensions#poetv#update()
+  if &filetype =~# 'python'
+    call airline#extensions#poetv#apply()
+    call airline#update_statusline()
+  endif
+endfunction

autoload/airline/extensions/promptline.vim

@@ -0,0 +1,36 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/edkolev/promptline.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists(':PromptlineSnapshot')
+  finish
+endif
+
+if !exists('airline#extensions#promptline#snapshot_file') || !len('airline#extensions#promptline#snapshot_file')
+  finish
+endif
+
+let s:prompt_snapshot_file = get(g:, 'airline#extensions#promptline#snapshot_file', '')
+let s:color_template = get(g:, 'airline#extensions#promptline#color_template', 'normal')
+
+function! airline#extensions#promptline#init(ext)
+  call a:ext.add_theme_func('airline#extensions#promptline#set_prompt_colors')
+endfunction
+
+function! airline#extensions#promptline#set_prompt_colors(palette)
+  let color_template = has_key(a:palette, s:color_template) ? s:color_template : 'normal'
+  let mode_palette = a:palette[color_template]
+
+  if !has_key(g:, 'promptline_symbols')
+    let g:promptline_symbols = {
+          \ 'left'           : g:airline_left_sep,
+          \ 'right'          : g:airline_right_sep,
+          \ 'left_alt'       : g:airline_left_alt_sep,
+          \ 'right_alt'      : g:airline_right_alt_sep}
+  endif
+
+  let promptline_theme = promptline#api#create_theme_from_airline(mode_palette)
+  call promptline#api#create_snapshot_with_theme(s:prompt_snapshot_file, promptline_theme)
+endfunction

autoload/airline/extensions/quickfix.vim

@@ -0,0 +1,58 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists('g:airline#extensions#quickfix#quickfix_text')
+  let g:airline#extensions#quickfix#quickfix_text = 'Quickfix'
+endif
+
+if !exists('g:airline#extensions#quickfix#location_text')
+  let g:airline#extensions#quickfix#location_text = 'Location'
+endif
+
+function! airline#extensions#quickfix#apply(...)
+  if &buftype == 'quickfix'
+    let w:airline_section_a = airline#extensions#quickfix#get_type()
+    let w:airline_section_b = '%{get(w:, "quickfix_title", "")}'
+    let w:airline_section_c = ''
+    let w:airline_section_x = ''
+  endif
+endfunction
+
+function! airline#extensions#quickfix#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#quickfix#apply')
+  call a:ext.add_inactive_statusline_func('airline#extensions#quickfix#inactive_qf_window')
+endfunction
+
+function! airline#extensions#quickfix#inactive_qf_window(...)
+  if getbufvar(a:2.bufnr, '&filetype') is# 'qf' && !empty(airline#util#getwinvar(a:2.winnr, 'quickfix_title', ''))
+    call setwinvar(a:2.winnr, 'airline_section_c', '[%{get(w:, "quickfix_title", "")}] %f %m')
+  endif
+endfunction
+
+function! airline#extensions#quickfix#get_type()
+  if exists("*win_getid") && exists("*getwininfo")
+    let dict = getwininfo(win_getid())
+    if len(dict) > 0 && get(dict[0], 'quickfix', 0) && !get(dict[0], 'loclist', 0)
+      return g:airline#extensions#quickfix#quickfix_text
+    elseif len(dict) > 0 && get(dict[0], 'quickfix', 0) && get(dict[0], 'loclist', 0)
+      return g:airline#extensions#quickfix#location_text
+    endif
+  endif
+  redir => buffers
+  silent ls
+  redir END
+
+  let nr = bufnr('%')
+  for buf in split(buffers, '\n')
+    if match(buf, '\v^\s*'.nr) > -1
+      if match(buf, '\cQuickfix') > -1
+        return g:airline#extensions#quickfix#quickfix_text
+      else
+        return g:airline#extensions#quickfix#location_text
+      endif
+    endif
+  endfor
+  return ''
+endfunction

autoload/airline/extensions/searchcount.vim

@@ -0,0 +1,43 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" This extension is inspired by vim-anzu <https://github.com/osyo-manga/vim-anzu>.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists('*searchcount')
+  finish
+endif
+
+function! airline#extensions#searchcount#init(ext) abort
+  call a:ext.add_statusline_func('airline#extensions#searchcount#apply')
+endfunction
+
+function! airline#extensions#searchcount#apply(...) abort
+  call airline#extensions#append_to_section('y',
+        \ '%{v:hlsearch ? airline#extensions#searchcount#status() : ""}')
+endfunction
+
+function! airline#extensions#searchcount#status() abort
+  try
+    let result = searchcount(#{recompute: 1, maxcount: -1})
+    if empty(result) || result.total ==# 0
+      return ''
+    endif
+    if result.incomplete ==# 1     " timed out
+      return printf(' /%s [?/??]', @/)
+    elseif result.incomplete ==# 2 " max count exceeded
+      if result.total > result.maxcount &&
+            \  result.current > result.maxcount
+        return printf('%s[>%d/>%d]', @/,
+              \		    result.current, result.total)
+      elseif result.total > result.maxcount
+        return printf('%s[%d/>%d]', @/,
+              \		    result.current, result.total)
+      endif
+    endif
+    return printf('%s[%d/%d]', @/,
+          \		result.current, result.total)
+  catch
+    return ''
+  endtry
+endfunction

autoload/airline/extensions/syntastic.vim

@@ -0,0 +1,44 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/vim-syntastic/syntastic
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists(':SyntasticCheck')
+  finish
+endif
+
+let s:error_symbol = get(g:, 'airline#extensions#syntastic#error_symbol', 'E:')
+let s:warning_symbol = get(g:, 'airline#extensions#syntastic#warning_symbol', 'W:')
+
+function! airline#extensions#syntastic#get_warning()
+  return airline#extensions#syntastic#get('warning')
+endfunction
+
+function! airline#extensions#syntastic#get_error()
+  return airline#extensions#syntastic#get('error')
+endfunction
+
+function! airline#extensions#syntastic#get(type)
+  let _backup = get(g:, 'syntastic_stl_format', '')
+  let is_err = (a:type  is# 'error')
+  if is_err
+    let g:syntastic_stl_format = get(g:, 'airline#extensions#syntastic#stl_format_err', '%E{[%fe(#%e)]}')
+  else
+    let g:syntastic_stl_format = get(g:, 'airline#extensions#syntastic#stl_format_warn', '%W{[%fw(#%w)]}')
+  endif
+  let cnt = SyntasticStatuslineFlag()
+  if !empty(_backup)
+    let g:syntastic_stl_format = _backup
+  endif
+  if empty(cnt)
+    return ''
+  else
+    return (is_err ? s:error_symbol : s:warning_symbol).cnt
+  endif
+endfunction
+
+function! airline#extensions#syntastic#init(ext)
+  call airline#parts#define_function('syntastic-warn', 'airline#extensions#syntastic#get_warning')
+  call airline#parts#define_function('syntastic-err', 'airline#extensions#syntastic#get_error')
+endfunction

autoload/airline/extensions/tabline.vim

@@ -0,0 +1,487 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2 et fdm=marker
+
+scriptencoding utf-8
+
+let s:taboo = get(g:, 'airline#extensions#taboo#enabled', 1) && get(g:, 'loaded_taboo', 0)
+if s:taboo
+  let g:taboo_tabline = 0
+endif
+
+let s:ctrlspace = get(g:, 'CtrlSpaceLoaded', 0)
+let s:tabws = get(g:, 'tabws_loaded', 0)
+let s:current_tabcnt = -1
+
+function! airline#extensions#tabline#init(ext)
+  if has('gui_running') && match(&guioptions, 'e') > -1
+    set guioptions-=e
+  endif
+
+  autocmd User AirlineToggledOn call s:toggle_on()
+  autocmd User AirlineToggledOff call s:toggle_off()
+  call s:toggle_on()
+  call a:ext.add_theme_func('airline#extensions#tabline#load_theme')
+endfunction
+
+function! airline#extensions#tabline#add_label(dict, type, right)
+  if get(g:, 'airline#extensions#tabline#show_tab_type', 1)
+    call a:dict.add_section_spaced('airline_tablabel'.
+          \ (a:right ? '_right' : ''),
+          \ get(g:, 'airline#extensions#tabline#'.a:type.'_label', a:type))
+  endif
+endfunction
+
+function! airline#extensions#tabline#add_tab_label(dict)
+  let show_tab_count = get(g:, 'airline#extensions#tabline#show_tab_count', 1)
+  if show_tab_count == 2
+    call a:dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
+  elseif show_tab_count == 1 && tabpagenr('$') > 1
+    call a:dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
+  endif
+endfunction
+
+if !exists(":def") || (exists(":def") && get(g:, "airline_experimental", 0)==0)
+
+  " Legacy VimScript implementation " {{{1
+  function! s:toggle_off() " {{{2
+    call airline#extensions#tabline#autoshow#off()
+    call airline#extensions#tabline#tabs#off()
+    call airline#extensions#tabline#buffers#off()
+    if s:ctrlspace
+      call airline#extensions#tabline#ctrlspace#off()
+    endif
+    if s:tabws
+      call airline#extensions#tabline#tabws#off()
+    endif
+  endfunction
+  function! s:toggle_on() " {{{2
+    if get(g:, 'airline_statusline_ontop', 0)
+      call airline#extensions#tabline#enable()
+      let &tabline='%!airline#statusline('.winnr().')'
+      return
+    endif
+    call airline#extensions#tabline#autoshow#on()
+    call airline#extensions#tabline#tabs#on()
+    call airline#extensions#tabline#buffers#on()
+    if s:ctrlspace
+      call airline#extensions#tabline#ctrlspace#on()
+    endif
+    if s:tabws
+      call airline#extensions#tabline#tabws#on()
+    endif
+
+    set tabline=%!airline#extensions#tabline#get()
+  endfunction
+  function! s:update_tabline(forceit) " {{{2
+    if get(g:, 'airline#extensions#tabline#disable_refresh', 0)
+      return
+    endif
+    " loading a session file
+    " On SessionLoadPost, g:SessionLoad variable is still set :/
+    if !a:forceit && get(g:, 'SessionLoad', 0)
+      return
+    endif
+    let match = expand('<afile>')
+    if pumvisible()
+      return
+    elseif !get(g:, 'airline#extensions#tabline#enabled', 0)
+      return
+    " return, if buffer matches ignore pattern or is directory (netrw)
+    elseif empty(match) || airline#util#ignore_buf(match) || isdirectory(match)
+      return
+    endif
+    call airline#util#doautocmd('BufMRUChange')
+    call airline#extensions#tabline#redraw()
+  endfunction
+  function! airline#extensions#tabline#redraw() " {{{2
+    " sometimes, the tabline is not correctly updated see #1580
+    " so force redraw here
+    if exists(":redrawtabline") == 2
+      redrawtabline
+    else
+    " Have to set a property equal to itself to get airline to re-eval.
+    " Setting `let &tabline=&tabline` destroys the cursor position so we
+    " need something less invasive.
+      let &ro = &ro
+    endif
+  endfunction
+  function! airline#extensions#tabline#enable() " {{{2
+    if &lines > 3
+      set showtabline=2
+    endif
+  endfunction
+  function! airline#extensions#tabline#load_theme(palette) " {{{2
+    if pumvisible()
+      return
+    endif
+    let colors    = get(a:palette, 'tabline', {})
+    let tablabel  = get(colors, 'airline_tablabel', a:palette.normal.airline_b)
+    " Theme for tabs on the left
+    let tab     = get(colors, 'airline_tab', a:palette.inactive.airline_c)
+    let tabsel  = get(colors, 'airline_tabsel', a:palette.normal.airline_a)
+    let tabtype = get(colors, 'airline_tabtype', a:palette.visual.airline_a)
+    let tabfill = get(colors, 'airline_tabfill', a:palette.normal.airline_c)
+    let tabmod  = get(colors, 'airline_tabmod', a:palette.insert.airline_a)
+    let tabhid  = get(colors, 'airline_tabhid', a:palette.normal.airline_c)
+    if has_key(a:palette, 'normal_modified') && has_key(a:palette.normal_modified, 'airline_c')
+      let tabmodu = get(colors, 'airline_tabmod_unsel', a:palette.normal_modified.airline_c)
+    else
+      "Fall back to normal airline_c if modified airline_c isn't present
+      let tabmodu = get(colors, 'airline_tabmod_unsel', a:palette.normal.airline_c)
+    endif
+    call airline#highlighter#exec('airline_tablabel', tablabel)
+    call airline#highlighter#exec('airline_tab', tab)
+    call airline#highlighter#exec('airline_tabsel', tabsel)
+    call airline#highlighter#exec('airline_tabtype', tabtype)
+    call airline#highlighter#exec('airline_tabfill', tabfill)
+    call airline#highlighter#exec('airline_tabmod', tabmod)
+    call airline#highlighter#exec('airline_tabmod_unsel', tabmodu)
+    call airline#highlighter#exec('airline_tabhid', tabhid)
+
+    " Theme for tabs on the right
+    " label on the right
+    let tablabel_r  = get(colors, 'airline_tablabel', a:palette.normal.airline_b)
+    let tabsel_right  = get(colors, 'airline_tabsel_right', a:palette.normal.airline_a)
+    let tab_right     = get(colors, 'airline_tab_right',    a:palette.inactive.airline_c)
+    let tabmod_right  = get(colors, 'airline_tabmod_right', a:palette.insert.airline_a)
+    let tabhid_right  = get(colors, 'airline_tabhid_right', a:palette.normal.airline_c)
+    if has_key(a:palette, 'normal_modified') && has_key(a:palette.normal_modified, 'airline_c')
+      let tabmodu_right = get(colors, 'airline_tabmod_unsel_right', a:palette.normal_modified.airline_c)
+    else
+      "Fall back to normal airline_c if modified airline_c isn't present
+      let tabmodu_right = get(colors, 'airline_tabmod_unsel_right', a:palette.normal.airline_c)
+    endif
+    call airline#highlighter#exec('airline_tablabel_right', tablabel_r)
+    call airline#highlighter#exec('airline_tab_right',    tab_right)
+    call airline#highlighter#exec('airline_tabsel_right', tabsel_right)
+    call airline#highlighter#exec('airline_tabmod_right', tabmod_right)
+    call airline#highlighter#exec('airline_tabhid_right', tabhid_right)
+    call airline#highlighter#exec('airline_tabmod_unsel_right', tabmodu_right)
+  endfunction
+  function! airline#extensions#tabline#get() " {{{2
+    let show_buffers = get(g:, 'airline#extensions#tabline#show_buffers', 1)
+    let show_tabs = get(g:, 'airline#extensions#tabline#show_tabs', 1)
+
+    let curtabcnt = tabpagenr('$')
+    if curtabcnt != s:current_tabcnt
+      let s:current_tabcnt = curtabcnt
+      call airline#extensions#tabline#tabs#invalidate()
+      call airline#extensions#tabline#buffers#invalidate()
+      call airline#extensions#tabline#ctrlspace#invalidate()
+      call airline#extensions#tabline#tabws#invalidate()
+    endif
+
+    if !exists('#airline#BufAdd#*')
+      autocmd airline BufAdd * call <sid>update_tabline(0)
+    endif
+    if !exists('#airline#SessionLoadPost')
+      autocmd airline SessionLoadPost * call <sid>update_tabline(1)
+    endif
+    if s:ctrlspace
+      return airline#extensions#tabline#ctrlspace#get()
+    elseif s:tabws
+      return airline#extensions#tabline#tabws#get()
+    elseif show_buffers && curtabcnt == 1 || !show_tabs
+      return airline#extensions#tabline#buffers#get()
+    else
+      return airline#extensions#tabline#tabs#get()
+    endif
+  endfunction
+  function! airline#extensions#tabline#title(n) " {{{2
+    let title = ''
+    if s:taboo
+      let title = TabooTabTitle(a:n)
+    endif
+
+    if empty(title) && exists('*gettabvar')
+      let title = gettabvar(a:n, 'title')
+    endif
+
+    let formatter = get(g:, 'airline#extensions#tabline#tabtitle_formatter')
+    if empty(title) && formatter !=# '' && exists("*".formatter)
+      let title = call(formatter, [a:n])
+    endif
+
+    if empty(title)
+      let buflist = tabpagebuflist(a:n)
+      let winnr = tabpagewinnr(a:n)
+      let all_buffers = airline#extensions#tabline#buflist#list()
+      let curbuf = filter(buflist, 'index(all_buffers, v:val) != -1')
+      if len(curbuf) ==  0
+        call add(curbuf, tabpagebuflist()[0])
+      endif
+      return airline#extensions#tabline#get_buffer_name(curbuf[0], curbuf)
+    endif
+    return title
+  endfunction
+  function! airline#extensions#tabline#get_buffer_name(nr, ...) " {{{2
+    let buffers = a:0 ? a:1 : airline#extensions#tabline#buflist#list()
+    let formatter = get(g:, 'airline#extensions#tabline#formatter', 'default')
+    return airline#extensions#tabline#formatters#{formatter}#format(a:nr, buffers)
+  endfunction
+  function! airline#extensions#tabline#new_builder() " {{{2
+    let builder_context = {
+          \ 'active'        : 1,
+          \ 'tabline'       : 1,
+          \ 'right_sep'     : get(g:, 'airline#extensions#tabline#right_sep'    , g:airline_right_sep),
+          \ 'right_alt_sep' : get(g:, 'airline#extensions#tabline#right_alt_sep', g:airline_right_alt_sep),
+          \ }
+    if get(g:, 'airline_powerline_fonts', 0)
+      let builder_context.left_sep     = get(g:, 'airline#extensions#tabline#left_sep'     , g:airline_left_sep)
+      let builder_context.left_alt_sep = get(g:, 'airline#extensions#tabline#left_alt_sep' , g:airline_left_alt_sep)
+    else
+      let builder_context.left_sep     = get(g:, 'airline#extensions#tabline#left_sep'     , ' ')
+      let builder_context.left_alt_sep = get(g:, 'airline#extensions#tabline#left_alt_sep' , '|')
+    endif
+    return airline#extensions#tabline#builder#new(builder_context)
+  endfunction
+  function! airline#extensions#tabline#group_of_bufnr(tab_bufs, bufnr) " {{{2
+    let cur = bufnr('%')
+    if cur == a:bufnr
+      if g:airline_detect_modified && getbufvar(a:bufnr, '&modified')
+        let group = 'airline_tabmod'
+      else
+        let group = 'airline_tabsel'
+      endif
+    else
+      if g:airline_detect_modified && getbufvar(a:bufnr, '&modified')
+        let group = 'airline_tabmod_unsel'
+      elseif index(a:tab_bufs, a:bufnr) > -1
+        let group = 'airline_tab'
+      else
+        let group = 'airline_tabhid'
+      endif
+    endif
+    return group
+  endfunction
+  function! airline#extensions#tabline#add_tab_label(dict) " {{{2
+    let show_tab_count = get(g:, 'airline#extensions#tabline#show_tab_count', 1)
+    if show_tab_count == 2
+      call a:dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
+    elseif show_tab_count == 1 && tabpagenr('$') > 1
+      call a:dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
+    endif
+  endfunction
+else
+  " Vim9 Script implementation
+  "def airline#extensions#tabline#init(ext: dict<any>): void # {{{2
+  "  Seems not to work yet :(
+  "  if has('gui_running') && match(&guioptions, 'e') > -1
+  "    :set guioptions-=e
+  "  endif
+  "  autocmd User AirlineToggledOn call s:toggle_on()
+  "  autocmd User AirlineToggledOff call s:toggle_off()
+  "  s:toggle_on()
+  "  try
+  "    ext.add_theme_func('airline#extensions#tabline#load_theme')
+  "  catch
+  "  endtry
+  "enddef
+  def s:toggle_off(): void # {{{2
+    airline#extensions#tabline#autoshow#off()
+    airline#extensions#tabline#tabs#off()
+    airline#extensions#tabline#buffers#off()
+    if s:ctrlspace
+      airline#extensions#tabline#ctrlspace#off()
+    endif
+    if s:tabws
+      airline#extensions#tabline#tabws#off()
+    endif
+  enddef
+  def s:toggle_on(): void # {{{2
+    if get(g:, 'airline_statusline_ontop', 0)
+      airline#extensions#tabline#enable()
+      &tabline = '%!airline#statusline(' .. winnr() .. ')'
+      return
+    endif
+    airline#extensions#tabline#autoshow#on()
+    airline#extensions#tabline#tabs#on()
+    airline#extensions#tabline#buffers#on()
+    if s:ctrlspace
+      airline#extensions#tabline#ctrlspace#on()
+    endif
+    if s:tabws
+      airline#extensions#tabline#tabws#on()
+    endif
+    &tabline = '%!airline#extensions#tabline#get()'
+  enddef
+  def s:update_tabline(forceit: number): void # {{{2
+    if get(g:, 'airline#extensions#tabline#disable_refresh', 0)
+      return
+    endif
+    if !forceit && get(g:, 'SessionLoad', 0)
+      return
+    endif
+    var match = expand('<afile>')
+    if pumvisible()
+      return
+    elseif !get(g:, 'airline#extensions#tabline#enabled', 0)
+      return
+    # return, if buffer matches ignore pattern or is directory (netrw)
+    elseif empty(match) || airline#util#ignore_buf(match) || isdirectory(match)
+      return
+    endif
+    airline#util#doautocmd('BufMRUChange')
+    airline#extensions#tabline#redraw()
+  enddef
+  def airline#extensions#tabline#redraw(): void # {{{2
+    # TODO: Is this still needed?
+    :redrawtabline
+  enddef
+  def airline#extensions#tabline#enable(): void # {{{2
+    if &lines > 3
+      &showtabline = 2
+    endif
+  enddef
+  def airline#extensions#tabline#load_theme(palette: dict<any>): void # {{{2
+    if pumvisible()
+      return
+    endif
+    var colors    = get(palette, 'tabline', {})
+    var tablabel  = get(colors, 'airline_tablabel', palette.normal.airline_b)
+    # Theme for tabs on the left
+    var tab     = get(colors, 'airline_tab', palette.inactive.airline_c)
+    var tabsel  = get(colors, 'airline_tabsel', palette.normal.airline_a)
+    var tabtype = get(colors, 'airline_tabtype', palette.visual.airline_a)
+    var tabfill = get(colors, 'airline_tabfill', palette.normal.airline_c)
+    var tabmod  = get(colors, 'airline_tabmod', palette.insert.airline_a)
+    var tabhid  = get(colors, 'airline_tabhid', palette.normal.airline_c)
+    var tabmodu = tabhid
+    var tabmodu_right = tabhid
+    if has_key(palette, 'normal_modified') && has_key(palette.normal_modified, 'airline_c')
+      tabmodu = get(colors, 'airline_tabmod_unsel', palette.normal_modified.airline_c)
+      tabmodu_right = get(colors, 'airline_tabmod_unsel_right', palette.normal_modified.airline_c)
+    else
+      # Fall back to normal airline_c if modified airline_c isn't present
+      tabmodu = get(colors, 'airline_tabmod_unsel', palette.normal.airline_c)
+      tabmodu_right = get(colors, 'airline_tabmod_unsel_right', palette.normal.airline_c)
+    endif
+    airline#highlighter#exec('airline_tablabel', tablabel)
+    airline#highlighter#exec('airline_tab', tab)
+    airline#highlighter#exec('airline_tabsel', tabsel)
+    airline#highlighter#exec('airline_tabtype', tabtype)
+    airline#highlighter#exec('airline_tabfill', tabfill)
+    airline#highlighter#exec('airline_tabmod', tabmod)
+    airline#highlighter#exec('airline_tabmod_unsel', tabmodu)
+    airline#highlighter#exec('airline_tabmod_unsel_right', tabmodu_right)
+    airline#highlighter#exec('airline_tabhid', tabhid)
+    # Theme for tabs on the right
+    var tablabel_r  = get(colors, 'airline_tablabel', palette.normal.airline_b)
+    var tabsel_right  = get(colors, 'airline_tabsel_right', palette.normal.airline_a)
+    var tab_right     = get(colors, 'airline_tab_right',    palette.inactive.airline_c)
+    var tabmod_right  = get(colors, 'airline_tabmod_right', palette.insert.airline_a)
+    var tabhid_right  = get(colors, 'airline_tabhid_right', palette.normal.airline_c)
+    airline#highlighter#exec('airline_tablabel_right', tablabel_r)
+    airline#highlighter#exec('airline_tab_right',    tab_right)
+    airline#highlighter#exec('airline_tabsel_right', tabsel_right)
+    airline#highlighter#exec('airline_tabmod_right', tabmod_right)
+    airline#highlighter#exec('airline_tabhid_right', tabhid_right)
+  enddef
+  def airline#extensions#tabline#get(): string # {{{2
+    var show_buffers = get(g:, 'airline#extensions#tabline#show_buffers', 1)
+    var show_tabs = get(g:, 'airline#extensions#tabline#show_tabs', 1)
+
+    var curtabcnt = tabpagenr('$')
+    if curtabcnt != s:current_tabcnt
+      s:current_tabcnt = curtabcnt
+      airline#extensions#tabline#tabs#invalidate()
+      airline#extensions#tabline#buffers#invalidate()
+      airline#extensions#tabline#ctrlspace#invalidate()
+      airline#extensions#tabline#tabws#invalidate()
+    endif
+
+    if !exists('#airline#BufAdd#*')
+      autocmd airline BufAdd * call <sid>update_tabline(0)
+    endif
+    if !exists('#airline#SessionLoadPost')
+      autocmd airline SessionLoadPost * call <sid>update_tabline(1)
+    endif
+    if s:ctrlspace
+      return airline#extensions#tabline#ctrlspace#get()
+    elseif s:tabws
+      return airline#extensions#tabline#tabws#get()
+    elseif show_buffers && curtabcnt == 1 || !show_tabs
+      return airline#extensions#tabline#buffers#get()
+    else
+      return airline#extensions#tabline#tabs#get()
+    endif
+  enddef
+  def airline#extensions#tabline#title(n: number): string # {{{2
+    var title = ''
+    if get(g:, 'airline#extensions#taboo#enabled', 1) &&
+      get(g:, 'loaded_taboo', 0) && exists("*TabooTabTitle")
+      title = call("TabooTabTitle", [n])
+    endif
+
+    if empty(title)
+      title = gettabvar(n, 'title')
+    endif
+
+    var formatter = get(g:, 'airline#extensions#tabline#tabtitle_formatter', '')
+    if empty(title) && !empty(formatter) && exists("*" .. formatter)
+      title = call(formatter, [n])
+    endif
+
+    if empty(title)
+      var buflist = tabpagebuflist(n)
+      var winnr = tabpagewinnr(n)
+      var all_buffers = airline#extensions#tabline#buflist#list()
+      var curbuf = filter(buflist, {_, v -> index(all_buffers, v) != -1})
+      if len(curbuf) ==  0
+        add(curbuf, tabpagebuflist()[0])
+      endif
+      return airline#extensions#tabline#get_buffer_name(curbuf[0], curbuf)
+    endif
+    return title
+  enddef
+  def airline#extensions#tabline#get_buffer_name(nr: number, buffers = airline#extensions#tabline#buflist#list()): string # {{{2
+    var Formatter = 'airline#extensions#tabline#formatters#' .. get(g:, 'airline#extensions#tabline#formatter', 'default') .. '#format'
+    return call(Formatter, [ nr, buffers] )
+  enddef
+  def airline#extensions#tabline#new_builder(): dict<any> # {{{2
+    var builder_context = {
+        'active': 1,
+        'tabline': 1,
+        'right_sep': get(g:, 'airline#extensions#tabline#right_sep', g:airline_right_sep),
+        'right_alt_sep': get(g:, 'airline#extensions#tabline#right_alt_sep', g:airline_right_alt_sep),
+        'left_sep': get(g:, 'airline#extensions#tabline#left_sep', g:airline_left_sep),
+        'left_alt_sep': get(g:, 'airline#extensions#tabline#left_alt_sep', g:airline_left_alt_sep),
+        }
+    return airline#extensions#tabline#builder#new(builder_context)
+  enddef
+  def airline#extensions#tabline#group_of_bufnr(tab_bufs: list<number>, bufnr: number): string # {{{2
+    var cur = bufnr('%')
+    var group = ''
+    if cur == bufnr
+      if g:airline_detect_modified && getbufvar(bufnr, '&modified')
+        group = 'airline_tabmod'
+      else
+        group = 'airline_tabsel'
+      endif
+    else
+      if g:airline_detect_modified && getbufvar(bufnr, '&modified')
+        group = 'airline_tabmod_unsel'
+      elseif index(tab_bufs, bufnr) > -1
+        group = 'airline_tab'
+      else
+        group = 'airline_tabhid'
+      endif
+    endif
+    return group
+  enddef
+  "def airline#extensions#tabline#add_label(dict: dict<any>, type: string, right: number): void # {{{2
+  "  # Seems not to work yet :(
+  "  if get(g:, 'airline#extensions#tabline#show_tab_type', 1)
+  "    dict.add_section_spaced('airline_tablabel' .. (right ? '_right' : ''),
+  "      get(g:, 'airline#extensions#tabline#' .. type .. '_label', type))
+  "  endif
+  "enddef
+  " def airline#extensions#tabline#add_tab_label(dict: dict<any>): void #  {{{2
+  "   var show_tab_count = get(g:, 'airline#extensions#tabline#show_tab_count', 1)
+  "   if show_tab_count == 2
+  "     dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
+  "   elseif show_tab_count == 1 && tabpagenr('$') > 1
+  "     dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
+  "   endif
+  " enddef
+endif

autoload/airline/extensions/tabline/autoshow.vim

@@ -0,0 +1,53 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:show_buffers = get(g:, 'airline#extensions#tabline#show_buffers', 1)
+let s:buf_min_count = get(g:, 'airline#extensions#tabline#buffer_min_count', 0)
+let s:tab_min_count = get(g:, 'airline#extensions#tabline#tab_min_count', 0)
+
+function! airline#extensions#tabline#autoshow#off()
+  if exists('s:original_tabline')
+    let &tabline = s:original_tabline
+    let &showtabline = s:original_showtabline
+  endif
+
+  augroup airline_tabline_autoshow
+    autocmd!
+  augroup END
+endfunction
+
+function! airline#extensions#tabline#autoshow#on()
+  let [ s:original_tabline, s:original_showtabline ] = [ &tabline, &showtabline ]
+
+  augroup airline_tabline_autoshow
+    autocmd!
+    if s:buf_min_count <= 0 && s:tab_min_count <= 1
+      call airline#extensions#tabline#enable()
+    else
+      if s:show_buffers == 1
+        autocmd BufEnter  * call <sid>show_tabline(s:buf_min_count, len(airline#extensions#tabline#buflist#list()))
+        autocmd BufUnload * call <sid>show_tabline(s:buf_min_count, len(airline#extensions#tabline#buflist#list()) - 1)
+      else
+        autocmd TabEnter  * call <sid>show_tabline(s:tab_min_count, tabpagenr('$'))
+      endif
+    endif
+
+    " Invalidate cache.  This has to come after the BufUnload for
+    " s:show_buffers, to invalidate the cache for BufEnter.
+    autocmd BufLeave,BufAdd,BufUnload * call airline#extensions#tabline#buflist#invalidate()
+  augroup END
+endfunction
+
+function! s:show_tabline(min_count, total_count)
+  if a:total_count >= a:min_count
+    if &showtabline != 2 && &lines > 3
+      set showtabline=2
+    endif
+  else
+    if &showtabline != 0
+      set showtabline=0
+    endif
+  endif
+endfunction

autoload/airline/extensions/tabline/buffers.vim

@@ -0,0 +1,266 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:spc = g:airline_symbols.space
+
+let s:current_bufnr = -1
+let s:current_modified = 0
+let s:current_tabline = ''
+let s:current_visible_buffers = []
+
+let s:number_map = {
+      \ '0': '⁰',
+      \ '1': '¹',
+      \ '2': '²',
+      \ '3': '³',
+      \ '4': '⁴',
+      \ '5': '⁵',
+      \ '6': '⁶',
+      \ '7': '⁷',
+      \ '8': '⁸',
+      \ '9': '⁹'
+      \ }
+let s:number_map = &encoding == 'utf-8'
+      \ ? get(g:, 'airline#extensions#tabline#buffer_idx_format', s:number_map)
+      \ : {}
+
+function! airline#extensions#tabline#buffers#off()
+  augroup airline_tabline_buffers
+    autocmd!
+  augroup END
+endfunction
+
+function! airline#extensions#tabline#buffers#on()
+  let terminal_event = has("nvim") ? 'TermOpen' : 'TerminalOpen'
+  augroup airline_tabline_buffers
+    autocmd!
+    autocmd BufDelete * call airline#extensions#tabline#buflist#clean()
+    if exists("##".terminal_event)
+      exe 'autocmd '. terminal_event. ' * call airline#extensions#tabline#buflist#clean()'
+    endif
+    autocmd User BufMRUChange call airline#extensions#tabline#buflist#clean()
+  augroup END
+endfunction
+
+function! airline#extensions#tabline#buffers#invalidate()
+  let s:current_bufnr = -1
+endfunction
+
+function! airline#extensions#tabline#buffers#get()
+  try
+    call <sid>map_keys()
+  catch
+    " no-op
+  endtry
+  let cur = bufnr('%')
+  if cur == s:current_bufnr && &columns == s:column_width
+    if !g:airline_detect_modified || getbufvar(cur, '&modified') == s:current_modified
+      return s:current_tabline
+    endif
+  endif
+
+  let b = airline#extensions#tabline#new_builder()
+  let tab_bufs = tabpagebuflist(tabpagenr())
+  let show_buf_label_first = 0
+
+  if get(g:, 'airline#extensions#tabline#buf_label_first', 0)
+    let show_buf_label_first = 1
+  endif
+  if show_buf_label_first
+    call airline#extensions#tabline#add_label(b, 'buffers', 0)
+  endif
+
+  let b.tab_bufs = tabpagebuflist(tabpagenr())
+
+  let b.overflow_group = 'airline_tabhid'
+  let b.buffers = airline#extensions#tabline#buflist#list()
+  if get(g:, 'airline#extensions#tabline#current_first', 0)
+    if index(b.buffers, cur) > -1
+      call remove(b.buffers, index(b.buffers, cur))
+    endif
+    let b.buffers = [cur] + b.buffers
+  endif
+
+  function! b.get_group(i) dict
+    let bufnum = get(self.buffers, a:i, -1)
+    if bufnum == -1
+      return ''
+    endif
+    let group = airline#extensions#tabline#group_of_bufnr(self.tab_bufs, bufnum)
+    if bufnum == bufnr('%')
+      let s:current_modified = (group == 'airline_tabmod') ? 1 : 0
+    endif
+    return group
+  endfunction
+
+  if has("tablineat")
+    function! b.get_pretitle(i) dict
+      let bufnum = get(self.buffers, a:i, -1)
+      return '%'.bufnum.'@airline#extensions#tabline#buffers#clickbuf@'
+    endfunction
+
+    function! b.get_posttitle(i) dict
+      return '%X'
+    endfunction
+  endif
+
+  function! b.get_title(i) dict
+    let bufnum = get(self.buffers, a:i, -1)
+    let group = self.get_group(a:i)
+    let pgroup = self.get_group(a:i - 1)
+    " always add a space when powerline_fonts are used
+    " or for the very first item
+    if get(g:, 'airline_powerline_fonts', 0) || a:i == 0
+      let space = s:spc
+    else
+      let space= (pgroup == group ? s:spc : '')
+    endif
+
+    if get(g:, 'airline#extensions#tabline#buffer_idx_mode', 0)
+      if len(s:number_map) > 0
+        return space. s:get_number(a:i) . '%(%{airline#extensions#tabline#get_buffer_name('.bufnum.')}%)' . s:spc
+      else
+        return '['.(a:i+1).s:spc.'%(%{airline#extensions#tabline#get_buffer_name('.bufnum.')}%)'.']'
+      endif
+    else
+      return space.'%(%{airline#extensions#tabline#get_buffer_name('.bufnum.')}%)'.s:spc
+    endif
+  endfunction
+
+  let current_buffer = max([index(b.buffers, cur), 0])
+  let last_buffer = len(b.buffers) - 1
+  call b.insert_titles(current_buffer, 0, last_buffer)
+
+  call b.add_section('airline_tabfill', '')
+  call b.split()
+  call b.add_section('airline_tabfill', '')
+  if !show_buf_label_first
+    call airline#extensions#tabline#add_label(b, 'buffers', 1)
+  endif
+
+  call airline#extensions#tabline#add_tab_label(b)
+
+  let s:current_bufnr = cur
+  let s:column_width = &columns
+  let s:current_tabline = b.build()
+  let s:current_visible_buffers = copy(b.buffers)
+  " Do not remove from s:current_visible_buffers, this breaks s:select_tab()
+  "if b._right_title <= last_buffer
+  "  call remove(s:current_visible_buffers, b._right_title, last_buffer)
+  "endif
+  "if b._left_title > 0
+  "  call remove(s:current_visible_buffers, 0, b._left_title)
+  "endif
+  return s:current_tabline
+endfunction
+
+function! s:get_number(index)
+  if len(s:number_map) == 0
+    return a:index
+  endif
+  let bidx_mode = get(g:, 'airline#extensions#tabline#buffer_idx_mode', 0)
+  if bidx_mode > 1
+    let l:count = bidx_mode == 2 ? a:index+11 : a:index+1
+    return join(map(split(printf('%02d', l:count), '\zs'),
+          \ 'get(s:number_map, v:val, "")'), '')
+  else
+    return get(s:number_map, a:index+1, '')
+  endif
+endfunction
+
+function! s:select_tab(buf_index)
+  " no-op when called in 'keymap_ignored_filetypes'
+  if count(get(g:, 'airline#extensions#tabline#keymap_ignored_filetypes',
+        \ ['vimfiler', 'nerdtree']), &ft)
+    return
+  endif
+  let idx = a:buf_index
+  if s:current_visible_buffers[0] == -1
+    let idx = idx + 1
+  endif
+
+  let buf = get(s:current_visible_buffers, idx, 0)
+  if buf != 0
+     exec 'b!' . buf
+   endif
+endfunction
+
+function! s:jump_to_tab(offset)
+    let l = airline#extensions#tabline#buflist#list()
+    let i = index(l, bufnr('%'))
+    if i > -1
+        exec 'b!' . l[(i + a:offset) % len(l)]
+    endif
+endfunction
+
+function! s:map_keys()
+  let bidx_mode = get(g:, 'airline#extensions#tabline#buffer_idx_mode', 1)
+  if bidx_mode > 0
+    if bidx_mode == 1
+      for i in range(1, 9)
+        exe printf('noremap <silent> <Plug>AirlineSelectTab%d :call <SID>select_tab(%d)<CR>', i, i-1)
+      endfor
+    else
+      let start_idx = bidx_mode == 2 ? 11 : 1
+      for i in range(start_idx, 99)
+        exe printf('noremap <silent> <Plug>AirlineSelectTab%02d :call <SID>select_tab(%d)<CR>', i, i-start_idx)
+      endfor
+    endif
+    noremap <silent> <Plug>AirlineSelectPrevTab :<C-u>call <SID>jump_to_tab(-v:count1)<CR>
+    noremap <silent> <Plug>AirlineSelectNextTab :<C-u>call <SID>jump_to_tab(v:count1)<CR>
+    " Enable this for debugging
+    " com! AirlineBufferList :echo map(copy(s:current_visible_buffers), {i,k -> k.": ".bufname(k)})
+  endif
+endfunction
+
+function! airline#extensions#tabline#buffers#clickbuf(minwid, clicks, button, modifiers) abort
+    " Clickable buffers
+    " works only in recent NeoVim with has('tablineat')
+
+    " single mouse button click without modifiers pressed
+    if a:clicks == 1 && a:modifiers !~# '[^ ]'
+      if a:button is# 'l'
+        " left button - switch to buffer
+        silent execute 'buffer' a:minwid
+      elseif a:button is# 'm'
+        " middle button - delete buffer
+
+        if get(g:, 'airline#extensions#tabline#middle_click_preserves_windows', 0) == 0 || winnr('$') == 1
+          " just simply delete the clicked buffer. This will cause windows
+          " associated with the clicked buffer to be closed.
+          silent execute 'bdelete' a:minwid
+        else
+          " find windows displaying the clicked buffer and open an new
+          " buffer in them.
+          let current_window = bufwinnr("%")
+          let window_number = bufwinnr(a:minwid)
+          let last_window_visited = -1
+
+          " Set to 1 if the clicked buffer was open in any windows.
+          let buffer_in_window = 0
+
+          " Find the next window with the clicked buffer open. If bufwinnr()
+          " returns the same window number, this is because we clicked a new
+          " buffer, and then tried editing a new buffer. Vim won't create a
+          " new empty buffer for the same window, so we get the same window
+          " number from bufwinnr(). In this case we just give up and don't
+          " delete the buffer.
+          " This could be made cleaner if we could check if the clicked buffer
+          " is a new buffer, but I don't know if there is a way to do that.
+          while window_number != -1 && window_number != last_window_visited
+            let buffer_in_window = 1
+            silent execute window_number . 'wincmd w'
+            silent execute 'enew'
+            let last_window_visited = window_number
+            let window_number = bufwinnr(a:minwid)
+          endwhile
+          silent execute current_window . 'wincmd w'
+          if window_number != last_window_visited || buffer_in_window == 0
+            silent execute 'bdelete' a:minwid
+          endif
+        endif
+      endif
+    endif
+endfunction

autoload/airline/extensions/tabline/buflist.vim

@@ -0,0 +1,81 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#tabline#buflist#invalidate()
+  unlet! s:current_buffer_list
+endfunction
+
+function! airline#extensions#tabline#buflist#clean()
+  call airline#extensions#tabline#buflist#invalidate()
+  call airline#extensions#tabline#buffers#invalidate()
+endfunction
+
+" paths in excludes list
+function! s:ExcludePaths(nr, exclude_paths)
+  let bname = bufname(a:nr)
+  if empty(bname)
+    return 0
+  endif
+  let bpath = fnamemodify(bname, ":p")
+  for f in a:exclude_paths
+    if bpath =~# f | return 1 | endif
+  endfor
+endfunction
+
+" other types to exclude
+function! s:ExcludeOther(nr, exclude_preview)
+  if (getbufvar(a:nr, 'current_syntax') == 'qf') ||
+        \  (a:exclude_preview && getbufvar(a:nr, '&bufhidden') == 'wipe'
+        \  && getbufvar(a:nr, '&buftype') == 'nofile')
+    return 1 | endif
+endfunction
+
+function! airline#extensions#tabline#buflist#list()
+  if exists('s:current_buffer_list')
+    return s:current_buffer_list
+  endif
+
+  let exclude_buffers = get(g:, 'airline#extensions#tabline#exclude_buffers', [])
+  let exclude_paths = get(g:, 'airline#extensions#tabline#excludes', [])
+  let exclude_preview = get(g:, 'airline#extensions#tabline#exclude_preview', 1)
+
+  let list = (exists('g:did_bufmru') && g:did_bufmru) ? BufMRUList() : range(1, bufnr("$"))
+
+  let buffers = []
+  " If this is too slow, we can switch to a different algorithm.
+  " Basically branch 535 already does it, but since it relies on
+  " BufAdd autocommand, I'd like to avoid this if possible.
+  for nr in list
+    if buflisted(nr)
+      " Do not add to the bufferlist, if either
+      " 1) bufnr is exclude_buffers list
+      " 2) buffername matches one of exclude_paths patterns
+      " 3) buffer is a quickfix buffer
+      " 4) when excluding preview windows:
+      "     'bufhidden' == wipe
+      "     'buftype' == nofile
+      " 5) ignore buffers matching airline#extensions#tabline#ignore_bufadd_pat
+
+      " check buffer numbers first
+      if index(exclude_buffers, nr) >= 0
+        continue
+      " check paths second
+      elseif !empty(exclude_paths) && s:ExcludePaths(nr, exclude_paths)
+        continue
+      " ignore buffers matching airline#extensions#tabline#ignore_bufadd_pat
+      elseif airline#util#ignore_buf(bufname(nr))
+        continue
+      " check other types last
+      elseif s:ExcludeOther(nr, exclude_preview)
+        continue
+      endif
+
+      call add(buffers, nr)
+    endif
+  endfor
+
+  let s:current_buffer_list = buffers
+  return buffers
+endfunction

autoload/airline/extensions/tabline/builder.vim

@@ -0,0 +1,232 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:prototype = {}
+
+" Set the point in the tabline where the builder should insert the titles.
+"
+" Subsequent calls will overwrite the previous ones, so only the last call
+" determines to location to insert titles.
+"
+" NOTE: The titles are not inserted until |build| is called, so that the
+" remaining contents of the tabline can be taken into account.
+"
+" Callers should define at least |get_title| and |get_group| on the host
+" object before calling |build|.
+function! s:prototype.insert_titles(current, first, last) dict
+  let self._first_title = a:first " lowest index
+  let self._last_title = a:last " highest index
+  let self._left_title = a:current " next index to add on the left
+  let self._right_title = a:current + 1 " next index to add on the right
+  let self._left_position = self.get_position() " left end of titles
+  let self._right_position = self._left_position " right end of the titles
+endfunction
+
+" Insert a title for entry number |index|, of group |group| at position |pos|,
+" if there is space for it. Returns 1 if it is inserted, 0 otherwise
+"
+" |force| inserts the title even if there isn't enough space left for it.
+" |sep_size| adjusts the size change that the title is considered to take up,
+"            to account for changes to the separators
+"
+" The title is defined by |get_title| on the hosting object, called with
+" |index| as its only argument.
+" |get_pretitle| and |get_posttitle| may be defined on the host object to
+" insert some formatting before or after the title. These should be 0-width.
+"
+" This method updates |_right_position| and |_remaining_space| on the host
+" object, if the title is inserted.
+function! s:prototype.try_insert_title(index, group, pos, sep_size, force) dict
+  let title = self.get_title(a:index)
+  let title_size = s:tabline_evaluated_length(title) + a:sep_size
+  if a:force || self._remaining_space >= title_size
+    let pos = a:pos
+    if has_key(self, "get_pretitle")
+      call self.insert_raw(self.get_pretitle(a:index), pos)
+      let self._right_position += 1
+      let pos += 1
+    endif
+
+    call self.insert_section(a:group, title, pos)
+    let self._right_position += 1
+    let pos += 1
+
+    if has_key(self, "get_posttitle")
+      call self.insert_raw(self.get_posttitle(a:index), pos)
+      let self._right_position += 1
+      let pos += 1
+    endif
+
+    let self._remaining_space -= title_size
+    return 1
+  endif
+  return 0
+endfunction
+
+function! s:get_separator_change(new_group, old_group, end_group, sep_size, alt_sep_size)
+  return s:get_separator_change_with_end(a:new_group, a:old_group, a:end_group, a:end_group, a:sep_size, a:alt_sep_size)
+endfunction
+
+" Compute the change in size of the tabline caused by separators
+"
+" This should be kept up-to-date with |s:get_transitioned_seperator| and
+" |s:get_separator| in autoload/airline/builder.vim
+function! s:get_separator_change_with_end(new_group, old_group, new_end_group, old_end_group, sep_size, alt_sep_size)
+  let sep_change = 0
+  if !empty(a:new_end_group) " Separator between title and the end
+    let sep_change += airline#builder#should_change_group(a:new_group, a:new_end_group) ? a:sep_size : a:alt_sep_size
+  endif
+  if !empty(a:old_group) " Separator between the title and the one adjacent
+    let sep_change += airline#builder#should_change_group(a:new_group, a:old_group) ? a:sep_size : a:alt_sep_size
+    if !empty(a:old_end_group) " Remove mis-predicted separator
+      let sep_change -= airline#builder#should_change_group(a:old_group, a:old_end_group) ? a:sep_size : a:alt_sep_size
+    endif
+  endif
+  return sep_change
+endfunction
+
+" This replaces the build function of the |airline#builder#new| object, to
+" insert titles as specified by the last call to |insert_titles| before
+" passing to the original build function.
+"
+" Callers should define at least |get_title| and |get_group| on the host
+" object if |insert_titles| has been called on it.
+function! s:prototype.build() dict
+  if has_key(self, '_left_position') && self._first_title <= self._last_title
+    let self._remaining_space = &columns - s:tabline_evaluated_length(self._build())
+
+    let center_active = get(g:, 'airline#extensions#tabline#center_active', 0)
+
+    let sep_size = s:tabline_evaluated_length(self._context.left_sep)
+    let alt_sep_size = s:tabline_evaluated_length(self._context.left_alt_sep)
+
+    let outer_left_group = airline#builder#get_prev_group(self._sections, self._left_position)
+    let outer_right_group = airline#builder#get_next_group(self._sections, self._right_position)
+
+    let overflow_marker = get(g:, 'airline#extensions#tabline#overflow_marker', g:airline_symbols.ellipsis)
+    let overflow_marker_size = s:tabline_evaluated_length(overflow_marker)
+    " Allow space for the markers before we begin filling in titles.
+    if self._left_title > self._first_title
+      let self._remaining_space -= overflow_marker_size +
+        \ s:get_separator_change(self.overflow_group, "", outer_left_group, sep_size, alt_sep_size)
+    endif
+    if self._left_title < self._last_title
+      let self._remaining_space -= overflow_marker_size +
+        \ s:get_separator_change(self.overflow_group, "", outer_right_group, sep_size, alt_sep_size)
+    endif
+
+    " Add the current title
+    let group = self.get_group(self._left_title)
+    if self._left_title == self._first_title
+      let sep_change = s:get_separator_change(group, "", outer_left_group, sep_size, alt_sep_size)
+    else
+      let sep_change = s:get_separator_change(group, "", self.overflow_group, sep_size, alt_sep_size)
+    endif
+    if self._left_title == self._last_title
+      let sep_change += s:get_separator_change(group, "", outer_right_group, sep_size, alt_sep_size)
+    else
+      let sep_change += s:get_separator_change(group, "", self.overflow_group, sep_size, alt_sep_size)
+    endif
+    let left_group = group
+    let right_group = group
+    let self._left_title -=
+      \ self.try_insert_title(self._left_title, group, self._left_position, sep_change, 1)
+
+    if get(g:, 'airline#extensions#tabline#current_first', 0)
+      " always have current title first
+      let self._left_position += 1
+    endif
+
+    if !center_active && self._right_title <= self._last_title
+      " Add the title to the right
+      let group = self.get_group(self._right_title)
+      if self._right_title == self._last_title
+        let sep_change = s:get_separator_change_with_end(group, right_group, outer_right_group, self.overflow_group, sep_size, alt_sep_size) - overflow_marker_size
+      else
+        let sep_change = s:get_separator_change(group, right_group, self.overflow_group, sep_size, alt_sep_size)
+      endif
+      let right_group = group
+      let self._right_title +=
+      \ self.try_insert_title(self._right_title, group, self._right_position, sep_change, 1)
+    endif
+
+    while self._remaining_space > 0
+      let done = 0
+      if self._left_title >= self._first_title
+        " Insert next title to the left
+        let group = self.get_group(self._left_title)
+        if self._left_title == self._first_title
+          let sep_change = s:get_separator_change_with_end(group, left_group, outer_left_group, self.overflow_group, sep_size, alt_sep_size) - overflow_marker_size
+        else
+          let sep_change = s:get_separator_change(group, left_group, self.overflow_group, sep_size, alt_sep_size)
+        endif
+        let left_group = group
+        let done = self.try_insert_title(self._left_title, group, self._left_position, sep_change, 0)
+        let self._left_title -= done
+      endif
+      " If center_active is set, this |if| operates as an independent |if|,
+      " otherwise as an |elif|.
+      if self._right_title <= self._last_title && (center_active || !done)
+        " Insert next title to the right
+        let group = self.get_group(self._right_title)
+        if self._right_title == self._last_title
+          let sep_change = s:get_separator_change_with_end(group, right_group, outer_right_group, self.overflow_group, sep_size, alt_sep_size) - overflow_marker_size
+        else
+          let sep_change = s:get_separator_change(group, right_group, self.overflow_group, sep_size, alt_sep_size)
+        endif
+        let right_group = group
+        let done = self.try_insert_title(self._right_title, group, self._right_position, sep_change, 0)
+        let self._right_title += done
+      endif
+      if !done
+        break
+      endif
+    endwhile
+
+    if self._left_title >= self._first_title
+      if get(g:, 'airline#extensions#tabline#current_first', 0)
+        let self._left_position -= 1
+      endif
+      call self.insert_section(self.overflow_group, overflow_marker, self._left_position)
+      let self._right_position += 1
+    endif
+
+    if self._right_title <= self._last_title
+      call self.insert_section(self.overflow_group, overflow_marker, self._right_position)
+    endif
+  endif
+
+  return self._build()
+endfunction
+
+let s:prototype.overflow_group = 'airline_tab'
+
+" Extract the text content a tabline will render. (Incomplete).
+"
+" See :help 'statusline' for the list of fields.
+function! s:evaluate_tabline(tabline)
+  let tabline = a:tabline
+  let tabline = substitute(tabline, '%{\([^}]\+\)}', '\=eval(submatch(1))', 'g')
+  let tabline = substitute(tabline, '%#[^#]\+#', '', 'g')
+  let tabline = substitute(tabline, '%(\([^)]\+\)%)', '\1', 'g')
+  let tabline = substitute(tabline, '%\d\+[TX]', '', 'g')
+  let tabline = substitute(tabline, '%=', '', 'g')
+  let tabline = substitute(tabline, '%\d*\*', '', 'g')
+  if has('tablineat')
+    let tabline = substitute(tabline, '%@[^@]\+@', '', 'g')
+  endif
+  return tabline
+endfunction
+
+function! s:tabline_evaluated_length(tabline)
+  return airline#util#strchars(s:evaluate_tabline(a:tabline))
+endfunction
+
+function! airline#extensions#tabline#builder#new(context)
+  let builder = airline#builder#new(a:context)
+  let builder._build = builder.build
+  call extend(builder, s:prototype, 'force')
+  return builder
+endfunction

autoload/airline/extensions/tabline/ctrlspace.vim

@@ -0,0 +1,166 @@
+" MIT License. Copyright (c) 2016-2020 Kevin Sapper et al.
+" Plugin: https://github.com/szw/vim-ctrlspace
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:current_bufnr = -1
+let s:current_modified = 0
+let s:current_tabnr = -1
+let s:current_tabline = ''
+let s:highlight_groups = ['hid', 0, '', 'sel', 'mod_unsel', 0, 'mod_unsel', 'mod']
+
+function! airline#extensions#tabline#ctrlspace#off()
+  augroup airline_tabline_ctrlspace
+    autocmd!
+  augroup END
+endfunction
+
+function! airline#extensions#tabline#ctrlspace#on()
+  augroup airline_tabline_ctrlspace
+    autocmd!
+    autocmd BufDelete * call airline#extensions#tabline#ctrlspace#invalidate()
+  augroup END
+endfunction
+
+function! airline#extensions#tabline#ctrlspace#invalidate()
+  let s:current_bufnr = -1
+  let s:current_tabnr = -1
+endfunction
+
+function! airline#extensions#tabline#ctrlspace#add_buffer_section(builder, cur_tab, cur_buf, pull_right)
+  let pos_extension = (a:pull_right ? '_right' : '')
+  
+  let buffer_list = []
+  for bufferindex in sort(keys(ctrlspace#api#Buffers(a:cur_tab)), 'N')
+    for buffer in ctrlspace#api#BufferList(a:cur_tab)
+      if buffer['index'] == bufferindex
+        call add(buffer_list, buffer)
+      endif
+    endfor
+  endfor
+
+  " add by tenfy(tenfyzhong@qq.com)
+  " if the current buffer no in the buffer list
+  " return false and no redraw tabline.
+  " Fixes #1515. if there a BufEnter autocmd execute redraw. The tabline may no update.
+  let bufnr_list = map(copy(buffer_list), 'v:val["index"]')
+  if index(bufnr_list, a:cur_buf) == -1 && a:cur_tab == s:current_tabnr
+    return 0
+  endif
+
+  let s:current_modified = getbufvar(a:cur_buf, '&modified')
+
+  for buffer in buffer_list
+    let group = 'airline_tab'
+          \ .s:highlight_groups[(4 * buffer.modified) + (2 * buffer.visible) + (a:cur_buf == buffer.index)]
+          \ .pos_extension
+
+    let buf_name = '%(%{airline#extensions#tabline#get_buffer_name('.buffer.index.')}%)'
+
+    if has("tablineat")
+      let buf_name = '%'.buffer.index.'@airline#extensions#tabline#buffers#clickbuf@'.buf_name.'%X'
+    endif
+
+    call a:builder.add_section_spaced(group, buf_name)
+  endfor
+
+  " add by tenfy(tenfyzhong@qq.com)
+  " if the selected buffer was updated
+  " return true
+  return 1
+endfunction
+
+function! airline#extensions#tabline#ctrlspace#add_tab_section(builder, pull_right)
+  let pos_extension = (a:pull_right ? '_right' : '')
+  let tab_list = ctrlspace#api#TabList()
+
+  for tab in tab_list
+    let group = 'airline_tab'
+          \ .s:highlight_groups[(4 * tab.modified) + (3 * tab.current)]
+          \ .pos_extension
+
+    if get(g:, 'airline#extensions#tabline#ctrlspace_show_tab_nr', 0) == 0
+      call a:builder.add_section_spaced(group, '%'.tab.index.'T'.tab.title.ctrlspace#api#TabBuffersNumber(tab.index).'%T')
+    else
+      call a:builder.add_section_spaced(group, '%'.(tab.index).'T'.(tab.index).(g:airline_symbols.space).(tab.title).ctrlspace#api#TabBuffersNumber(tab.index).'%T')
+    endif
+  endfor
+endfunction
+
+function! airline#extensions#tabline#ctrlspace#get()
+  let cur_buf = bufnr('%')
+  let buffer_label = get(g:, 'airline#extensions#tabline#buffers_label', 'buffers')
+  let tab_label = get(g:, 'airline#extensions#tabline#tabs_label', 'tabs')
+  let switch_buffers_and_tabs = get(g:, 'airline#extensions#tabline#switch_buffers_and_tabs', 0)
+
+  try
+    call airline#extensions#tabline#tabs#map_keys()
+  endtry
+
+  let cur_tab = tabpagenr()
+
+  if cur_buf == s:current_bufnr && cur_tab == s:current_tabnr
+    if !g:airline_detect_modified || getbufvar(cur_buf, '&modified') == s:current_modified
+      return s:current_tabline
+    endif
+  endif
+
+  let builder = airline#extensions#tabline#new_builder()
+
+  let show_buffers = get(g:, 'airline#extensions#tabline#show_buffers', 1)
+  let show_tabs = get(g:, 'airline#extensions#tabline#show_tabs', 1)
+
+  let AppendBuffers = function('airline#extensions#tabline#ctrlspace#add_buffer_section', [builder, cur_tab, cur_buf])
+  let AppendTabs = function('airline#extensions#tabline#ctrlspace#add_tab_section', [builder])
+  let AppendLabel = function(builder.add_section_spaced, ['airline_tabtype'], builder)
+
+  " <= 1: |{Tabs}                      <tab|
+  " == 2: |{Buffers}               <buffers|
+  " == 3: |buffers> {Buffers}  {Tabs} <tabs|
+  let showing_mode = (2 * show_buffers) + (show_tabs)
+  let ignore_update = 0
+
+  " Add left tabline content
+  if showing_mode <= 1 " Tabs only mode
+    call AppendTabs(0)
+  elseif showing_mode == 2 " Buffers only mode
+    let ignore_update = !AppendBuffers(0)
+  else
+    if !switch_buffers_and_tabs
+      call AppendLabel(buffer_label)
+      let ignore_update = !AppendBuffers(0)
+    else
+      call AppendLabel(tab_label)
+      call AppendTabs(0)
+    endif
+  endif
+
+  if ignore_update | return s:current_tabline | endif
+
+  call builder.add_section('airline_tabfill', '')
+  call builder.split()
+  call builder.add_section('airline_tabfill', '')
+
+  " Add right tabline content
+  if showing_mode <= 1 " Tabs only mode
+    call AppendLabel(tab_label)
+  elseif showing_mode == 2 " Buffers only mode
+    call AppendLabel(buffer_label)
+  else
+    if !switch_buffers_and_tabs
+      call AppendTabs(1)
+      call AppendLabel(tab_label)
+    else
+      let ignore_update = AppendBuffers(1)
+      call AppendLabel(buffer_label)
+    endif
+  endif
+
+  if ignore_update | return s:current_tabline | endif
+
+  let s:current_bufnr = cur_buf
+  let s:current_tabnr = cur_tab
+  let s:current_tabline = builder.build()
+  return s:current_tabline
+endfunction

autoload/airline/extensions/tabline/formatters/default.vim

@@ -0,0 +1,82 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2 et fdm=marker
+
+scriptencoding utf-8
+
+if !exists(":def") || (exists(":def") && get(g:, "airline_experimental", 0)==0)
+  " Legacy VimScript implementation {{{1
+  function! airline#extensions#tabline#formatters#default#format(bufnr, buffers)  " {{{2
+    let fnametruncate = get(g:, 'airline#extensions#tabline#fnametruncate', 0)
+    let fmod = get(g:, 'airline#extensions#tabline#fnamemod', ':~:.')
+    let _ = ''
+
+    let name = bufname(a:bufnr)
+    if empty(name)
+      let _ .= '[No Name]'
+    elseif name =~ 'term://'
+      " Neovim Terminal
+      let _ = substitute(name, '\(term:\)//.*:\(.*\)', '\1 \2', '')
+    else
+      if get(g:, 'airline#extensions#tabline#fnamecollapse', 1)
+        " Does not handle non-ascii characters like Cyrillic: 'D/Учёба/t.c'
+        "let _ .= substitute(fnamemodify(name, fmod), '\v\w\zs.{-}\ze(\\|/)', '', 'g')
+        let _ .= pathshorten(fnamemodify(name, fmod))
+      else
+        let _ .= fnamemodify(name, fmod)
+      endif
+      if a:bufnr != bufnr('%') && fnametruncate && strlen(_) > fnametruncate
+        let _ = airline#util#strcharpart(_, 0, fnametruncate)
+      endif
+    endif
+
+    return airline#extensions#tabline#formatters#default#wrap_name(a:bufnr, _)
+  endfunction
+
+  function! airline#extensions#tabline#formatters#default#wrap_name(bufnr, buffer_name) " {{{2
+    let buf_nr_format = get(g:, 'airline#extensions#tabline#buffer_nr_format', '%s: ')
+    let buf_nr_show = get(g:, 'airline#extensions#tabline#buffer_nr_show', 0)
+
+    let _ = buf_nr_show ? printf(buf_nr_format, a:bufnr) : ''
+    let _ .= substitute(a:buffer_name, '\\', '/', 'g')
+
+    if getbufvar(a:bufnr, '&modified') == 1
+      let _ .= g:airline_symbols.modified
+    endif
+    return _
+  endfunction
+else
+  " New Vim9 script implementation {{{1
+  def airline#extensions#tabline#formatters#default#format(bufnr: number, buffers: list<number>): string # {{{2
+    var fmod = get(g:, 'airline#extensions#tabline#fnamemod', ':~:.')
+    var result = ''
+		var fnametruncate = get(g:, 'airline#extensions#tabline#fnametruncate', 0)
+
+    var name = bufname(bufnr)
+    if empty(name)
+      result =  '[No Name]'
+    elseif name =~ 'term://'
+      # Neovim Terminal
+      result = substitute(name, '\(term:\)//.*:\(.*\)', '\1 \2', '')
+    else
+      if get(g:, 'airline#extensions#tabline#fnamecollapse', 1)
+         result = pathshorten(fnamemodify(name, fmod))
+      else
+         result = fnamemodify(name, fmod)
+      endif
+      if bufnr != bufnr('%') && fnametruncate && strlen(result) > fnametruncate
+        result = airline#util#strcharpart(result, 0, fnametruncate)
+      endif
+    endif
+    return airline#extensions#tabline#formatters#default#wrap_name(bufnr, result)
+  enddef
+  def airline#extensions#tabline#formatters#default#wrap_name(bufnr: number, buffer_name: string): string # {{{2
+    var buf_nr_show = get(g:, 'airline#extensions#tabline#buffer_nr_show', 0)
+    var buf_nr_format = get(g:, 'airline#extensions#tabline#buffer_nr_format', '%s: ')
+    var result = buf_nr_show ? printf(buf_nr_format, bufnr) : ''
+    result = result .. substitute(buffer_name, '\\', '/', 'g')
+    if getbufvar(bufnr, '&modified') == 1
+      result = result .. g:airline_symbols.modified
+    endif
+    return result
+  enddef
+endif

autoload/airline/extensions/tabline/formatters/jsformatter.vim

@@ -0,0 +1,15 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#tabline#formatters#jsformatter#format(bufnr, buffers)
+  let buf = bufname(a:bufnr)
+  let filename = fnamemodify(buf, ':t')
+
+  if filename == 'index.js' || filename == 'index.jsx' || filename == 'index.ts' || filename == 'index.tsx'
+    return fnamemodify(buf, ':p:h:t') . '/i'
+  else
+    return airline#extensions#tabline#formatters#unique_tail_improved#format(a:bufnr, a:buffers)
+  endif
+endfunction

autoload/airline/extensions/tabline/formatters/short_path.vim

@@ -0,0 +1,22 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:fnamecollapse = get(g:, 'airline#extensions#tabline#fnamecollapse', 1)
+
+function! airline#extensions#tabline#formatters#short_path#format(bufnr, buffers)
+  let _ = ''
+
+  let name = bufname(a:bufnr)
+  if empty(name)
+    let _ .= '[No Name]'
+  elseif name =~ 'term://'
+    " Neovim Terminal
+    let _ = substitute(name, '\(term:\)//.*:\(.*\)', '\1 \2', '')
+  else
+    let _ .= fnamemodify(name, ':p:h:t') . '/' . fnamemodify(name, ':t')
+  endif
+
+  return airline#extensions#tabline#formatters#default#wrap_name(a:bufnr, _)
+endfunction

autoload/airline/extensions/tabline/formatters/tabnr.vim

@@ -0,0 +1,15 @@
+" MIT License. Copyright (c) 2017-2020 Christian Brabandt et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#tabline#formatters#tabnr#format(tab_nr_type, nr)
+  let spc=g:airline_symbols.space
+  if a:tab_nr_type == 0 " nr of splits
+    return spc. '%{len(tabpagebuflist('.a:nr.'))}'
+  elseif a:tab_nr_type == 1 " tab number
+    return spc. a:nr
+  else "== 2 splits and tab number
+    return spc. a:nr. '.%{len(tabpagebuflist('.a:nr.'))}'
+  endif
+endfunction

autoload/airline/extensions/tabline/formatters/unique_tail.vim

@@ -0,0 +1,46 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#tabline#formatters#unique_tail#format(bufnr, buffers)
+  let duplicates = {}
+  let tails = {}
+  let map = {}
+  for nr in a:buffers
+    let name = bufname(nr)
+    if empty(name)
+      let map[nr] = airline#extensions#tabline#formatters#default#wrap_name(nr, '[No Name]')
+    else
+      if name =~ 'term://'
+        " Neovim Terminal
+        let tail = substitute(name, '\(term:\)//.*:\(.*\)', '\1 \2', '')
+      else
+        let tail = fnamemodify(name, ':s?/\+$??:t')
+      endif
+      if has_key(tails, tail)
+        let duplicates[nr] = nr
+      endif
+      let tails[tail] = 1
+      let map[nr] = airline#extensions#tabline#formatters#default#wrap_name(nr, tail)
+    endif
+  endfor
+
+  let fmod = get(g:, 'airline#extensions#tabline#fnamemod', ':p:.')
+  for nr in values(duplicates)
+    let name = bufname(nr)
+    let fnamecollapse = get(g:, 'airline#extensions#tabline#fnamecollapse', 1)
+    if fnamecollapse
+      let map[nr] = airline#extensions#tabline#formatters#default#wrap_name(nr, substitute(fnamemodify(name, fmod), '\v\w\zs.{-}\ze(\\|/)', '', 'g'))
+    else
+      let map[nr] = airline#extensions#tabline#formatters#default#wrap_name(nr, fnamemodify(name, fmod))
+    endif
+  endfor
+
+  if has_key(map, a:bufnr)
+    return map[a:bufnr]
+  endif
+
+  " if we get here, the buffer list isn't in sync with the selected buffer yet, fall back to the default
+  return airline#extensions#tabline#formatters#default#format(a:bufnr, a:buffers)
+endfunction

autoload/airline/extensions/tabline/formatters/unique_tail_improved.vim

@@ -0,0 +1,91 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:skip_symbol = '…'
+
+function! airline#extensions#tabline#formatters#unique_tail_improved#format(bufnr, buffers)
+  if len(a:buffers) <= 1 " don't need to compare bufnames if has less than one buffer opened
+    return airline#extensions#tabline#formatters#default#format(a:bufnr, a:buffers)
+  endif
+
+  let curbuf_tail = fnamemodify(bufname(a:bufnr), ':t')
+  let do_deduplicate = 0
+  let path_tokens = {}
+
+  for nr in a:buffers
+    let name = bufname(nr)
+    if !empty(name) && nr != a:bufnr && fnamemodify(name, ':t') == curbuf_tail " only perform actions if curbuf_tail isn't unique
+      let do_deduplicate = 1
+      let tokens = reverse(split(substitute(fnamemodify(name, ':p:h'), '\\', '/', 'g'), '/'))
+      let token_index = 0
+      for token in tokens
+        if token == '' | continue | endif
+        if token == '.' | break | endif
+        if !has_key(path_tokens, token_index)
+          let path_tokens[token_index] = {}
+        endif
+        let path_tokens[token_index][token] = 1
+        let token_index += 1
+      endfor
+    endif
+  endfor
+
+  if do_deduplicate == 1
+    let path = []
+    let token_index = 0
+    for token in reverse(split(substitute(fnamemodify(bufname(a:bufnr), ':p:h'), '\\', '/', 'g'), '/'))
+      if token == '.' | break | endif
+      let duplicated = 0
+      let uniq = 1
+      let single = 1
+      if has_key(path_tokens, token_index)
+        let duplicated = 1
+        if len(keys(path_tokens[token_index])) > 1 | let single = 0 | endif
+        if has_key(path_tokens[token_index], token) | let uniq = 0 | endif
+      endif
+      call insert(path, {'token': token, 'duplicated': duplicated, 'uniq': uniq, 'single': single})
+      let token_index += 1
+    endfor
+
+    let buf_name = [curbuf_tail]
+    let has_uniq = 0
+    let has_skipped = 0
+    for token1 in reverse(path)
+      if !token1['duplicated'] && len(buf_name) > 1
+        call insert(buf_name, s:skip_symbol)
+        let has_skipped = 0
+        break
+      endif
+
+      if has_uniq == 1
+        call insert(buf_name, s:skip_symbol)
+        let has_skipped = 0
+        break
+      endif
+
+      if token1['uniq'] == 0 && token1['single'] == 1
+        let has_skipped = 1
+      else
+        if has_skipped == 1
+          call insert(buf_name, s:skip_symbol)
+          let has_skipped = 0
+        endif
+        call insert(buf_name, token1['token'])
+      endif
+
+      if token1['uniq'] == 1
+        let has_uniq = 1
+      endif
+    endfor
+
+    if has_skipped == 1
+      call insert(buf_name, s:skip_symbol)
+    endif
+
+    return airline#extensions#tabline#formatters#default#wrap_name(a:bufnr, join(buf_name, '/'))
+  else
+    return airline#extensions#tabline#formatters#default#format(a:bufnr, a:buffers)
+  endif
+endfunction

autoload/airline/extensions/tabline/tabs.vim

@@ -0,0 +1,134 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:spc = g:airline_symbols.space
+let s:current_bufnr = -1
+let s:current_tabnr = -1
+let s:current_modified = 0
+
+function! airline#extensions#tabline#tabs#off()
+  augroup airline_tabline_tabs
+    autocmd!
+  augroup END
+endfunction
+
+function! airline#extensions#tabline#tabs#on()
+  augroup airline_tabline_tabs
+    autocmd!
+    autocmd BufDelete * call airline#extensions#tabline#tabs#invalidate()
+  augroup END
+endfunction
+
+function! airline#extensions#tabline#tabs#invalidate()
+  let s:current_bufnr = -1
+endfunction
+
+function! airline#extensions#tabline#tabs#get()
+  let curbuf = bufnr('%')
+  let curtab = tabpagenr()
+  try
+    call airline#extensions#tabline#tabs#map_keys()
+  catch
+    " no-op
+  endtry
+  if curbuf == s:current_bufnr && curtab == s:current_tabnr && &columns == s:column_width
+    if !g:airline_detect_modified || getbufvar(curbuf, '&modified') == s:current_modified
+      return s:current_tabline
+    endif
+  endif
+
+  let b = airline#extensions#tabline#new_builder()
+
+  call airline#extensions#tabline#add_label(b, 'tabs', 0)
+
+  function! b.get_group(i) dict
+    let curtab = tabpagenr()
+    let group = 'airline_tab'
+    if a:i == curtab
+      let group = 'airline_tabsel'
+      if g:airline_detect_modified
+        for bi in tabpagebuflist(curtab)
+          if getbufvar(bi, '&modified')
+            let group = 'airline_tabmod'
+          endif
+        endfor
+      endif
+      let s:current_modified = (group == 'airline_tabmod') ? 1 : 0
+    endif
+    return group
+  endfunction
+
+  function! b.get_title(i) dict
+    let val = '%('
+
+    if get(g:, 'airline#extensions#tabline#show_tab_nr', 1)
+      let tab_nr_type = get(g:, 'airline#extensions#tabline#tab_nr_type', 0)
+      let val .= airline#extensions#tabline#tabs#tabnr_formatter(tab_nr_type, a:i)
+    endif
+
+    return val.'%'.a:i.'T %{airline#extensions#tabline#title('.a:i.')} %)'
+  endfunction
+
+  call b.insert_titles(curtab, 1, tabpagenr('$'))
+
+  call b.add_section('airline_tabfill', '')
+  call b.split()
+  call b.add_section('airline_tabfill', '')
+
+  if get(g:, 'airline#extensions#tabline#show_close_button', 1)
+    call b.add_section('airline_tab_right', ' %999X'.
+          \ get(g:, 'airline#extensions#tabline#close_symbol', 'X').' ')
+  endif
+
+  if get(g:, 'airline#extensions#tabline#show_splits', 1) == 1
+    let buffers = tabpagebuflist(curtab)
+    for nr in buffers
+      let group = airline#extensions#tabline#group_of_bufnr(buffers, nr) . "_right"
+      call b.add_section_spaced(group, '%(%{airline#extensions#tabline#get_buffer_name('.nr.')}%)')
+    endfor
+    if get(g:, 'airline#extensions#tabline#show_buffers', 1)
+      call airline#extensions#tabline#add_label(b, 'buffers', 1)
+    endif
+  endif
+  call airline#extensions#tabline#add_tab_label(b)
+
+  let s:current_bufnr = curbuf
+  let s:current_tabnr = curtab
+  let s:column_width = &columns
+  let s:current_tabline = b.build()
+  return s:current_tabline
+endfunction
+
+function! airline#extensions#tabline#tabs#map_keys()
+  if maparg('<Plug>AirlineSelectTab1', 'n') is# ':1tabn<CR>'
+    return
+  endif
+  let bidx_mode = get(g:, 'airline#extensions#tabline#buffer_idx_mode', 1)
+  if bidx_mode == 1
+    for i in range(1, 9)
+      exe printf('noremap <silent> <Plug>AirlineSelectTab%d :%dtabn<CR>', i, i)
+    endfor
+  else
+      for i in range(11, 99)
+        exe printf('noremap <silent> <Plug>AirlineSelectTab%d :%dtabn<CR>', i, i-10)
+      endfor
+    endif
+  noremap <silent> <Plug>AirlineSelectPrevTab gT
+  " tabn {count} goes to count tab does not go {count} tab pages forward!
+  noremap <silent> <Plug>AirlineSelectNextTab :<C-U>exe repeat(':tabn\|', v:count1)<cr>
+endfunction
+
+function! airline#extensions#tabline#tabs#tabnr_formatter(nr, i) abort
+  let formatter = get(g:, 'airline#extensions#tabline#tabnr_formatter', 'tabnr')
+  try
+    return airline#extensions#tabline#formatters#{formatter}#format(a:nr, a:i)
+  catch /^Vim\%((\a\+)\)\=:E117/	" catch E117, unknown function
+    " Function not found
+    return call(formatter, [a:nr, a:i])
+  catch
+    " something went wrong, return an empty string
+    return ""
+  endtry
+endfunction

autoload/airline/extensions/tabline/tabws.vim

@@ -0,0 +1,154 @@
+" MIT License. Copyright (c) 2016-2020 Kevin Sapper et al.
+" PLugin: https://github.com/s1341/vim-tabws
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:current_bufnr = -1
+let s:current_modified = 0
+let s:current_tabnr = -1
+let s:current_tabline = ''
+let s:highlight_groups = ['hid', 0, '', 'sel', 'mod_unsel', 0, 'mod_unsel', 'mod']
+
+function! airline#extensions#tabline#tabws#off()
+  augroup airline_tabline_tabws
+    autocmd!
+  augroup END
+endfunction
+
+function! airline#extensions#tabline#tabws#on()
+  augroup airline_tabline_tabws
+    autocmd!
+    autocmd BufDelete * call airline#extensions#tabline#tabws#invalidate()
+  augroup END
+endfunction
+
+function! airline#extensions#tabline#tabws#invalidate()
+  let s:current_bufnr = -1
+  let s:current_tabnr = -1
+endfunction
+
+function! airline#extensions#tabline#tabws#add_buffer_section(builder, cur_tab, cur_buf, pull_right)
+  let pos_extension = (a:pull_right ? '_right' : '')
+  let bufnr_list = tabws#getbuffersfortab(a:cur_tab)
+
+  if index(bufnr_list, a:cur_buf) == -1 && a:cur_tab == s:current_tabnr
+    return 0
+  endif
+
+  let s:current_modified = getbufvar(a:cur_buf, '&modified')
+  let visible_list = tabpagebuflist(a:cur_tab)
+
+  for buffer in bufnr_list
+    let group = 'airline_tab'
+          \ .s:highlight_groups[(4 * getbufvar(buffer, '&modified')) + (2 * (index(visible_list, buffer) != -1)) + (a:cur_buf == buffer)]
+          \ .pos_extension
+
+    let buf_name = '%(%{airline#extensions#tabline#get_buffer_name('.buffer.')}%)'
+
+    if has("tablineat")
+      let buf_name = '%'.buffer.'@airline#extensions#tabline#buffers#clickbuf@'.buf_name.'%X'
+    endif
+
+    call a:builder.add_section_spaced(group, buf_name)
+  endfor
+
+  " add by tenfy(tenfyzhong@qq.com)
+  " if the selected buffer was updated
+  " return true
+  return 1
+endfunction
+
+function! airline#extensions#tabline#tabws#add_tab_section(builder, pull_right)
+  let pos_extension = (a:pull_right ? '_right' : '')
+
+  for tab in range(1, tabpagenr('$'))
+    let current = tab == tabpagenr()
+    let group = 'airline_tab'
+          \ .s:highlight_groups[(3 * current)]
+          \ .pos_extension
+
+    if get(g:, 'airline#extensions#tabline#tabws_show_tab_nr', 0) == 0
+      call a:builder.add_section_spaced(group, '%'.tab.'T'.tabws#gettabname(tab).'%T')
+    else
+      call a:builder.add_section_spaced(group, '%'.tab.'T'.tab.(g:airline_symbols.space).tabws#gettabname(tab).'%T')
+    endif
+  endfor
+endfunction
+
+function! airline#extensions#tabline#tabws#get()
+  let cur_buf = bufnr('%')
+  let buffer_label = get(g:, 'airline#extensions#tabline#buffers_label', 'buffers')
+  let tab_label = get(g:, 'airline#extensions#tabline#tabs_label', 'tabs')
+  let switch_buffers_and_tabs = get(g:, 'airline#extensions#tabline#switch_buffers_and_tabs', 0)
+
+  try
+    call airline#extensions#tabline#tabs#map_keys()
+  endtry
+
+  let cur_tab = tabpagenr()
+
+  if cur_buf == s:current_bufnr && cur_tab == s:current_tabnr
+    if !g:airline_detect_modified || getbufvar(cur_buf, '&modified') == s:current_modified
+      return s:current_tabline
+    endif
+  endif
+
+  let builder = airline#extensions#tabline#new_builder()
+
+  let show_buffers = get(g:, 'airline#extensions#tabline#show_buffers', 1)
+  let show_tabs = get(g:, 'airline#extensions#tabline#show_tabs', 1)
+
+  let AppendBuffers = function('airline#extensions#tabline#tabws#add_buffer_section', [builder, cur_tab, cur_buf])
+  let AppendTabs = function('airline#extensions#tabline#tabws#add_tab_section', [builder])
+  let AppendLabel = function(builder.add_section_spaced, ['airline_tabtype'], builder)
+
+  " <= 1: |{Tabs}                      <tab|
+  " == 2: |{Buffers}               <buffers|
+  " == 3: |buffers> {Buffers}  {Tabs} <tabs|
+  let showing_mode = (2 * show_buffers) + (show_tabs)
+  let ignore_update = 0
+
+  " Add left tabline content
+  if showing_mode <= 1 " Tabs only mode
+    call AppendTabs(0)
+  elseif showing_mode == 2 " Buffers only mode
+    let ignore_update = !AppendBuffers(0)
+  else
+    if !switch_buffers_and_tabs
+      call AppendLabel(buffer_label)
+      let ignore_update = !AppendBuffers(0)
+    else
+      call AppendLabel(tab_label)
+      call AppendTabs(0)
+    endif
+  endif
+
+  if ignore_update | return s:current_tabline | endif
+
+  call builder.add_section('airline_tabfill', '')
+  call builder.split()
+  call builder.add_section('airline_tabfill', '')
+
+  " Add right tabline content
+  if showing_mode <= 1 " Tabs only mode
+    call AppendLabel(tab_label)
+  elseif showing_mode == 2 " Buffers only mode
+    call AppendLabel(buffer_label)
+  else
+    if !switch_buffers_and_tabs
+      call AppendTabs(1)
+      call AppendLabel(tab_label)
+    else
+      let ignore_update = AppendBuffers(1)
+      call AppendLabel(buffer_label)
+    endif
+  endif
+
+  if ignore_update | return s:current_tabline | endif
+
+  let s:current_bufnr = cur_buf
+  let s:current_tabnr = cur_tab
+  let s:current_tabline = builder.build()
+  return s:current_tabline
+endfunction

autoload/airline/extensions/tabline/xtabline.vim

@@ -0,0 +1,396 @@
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+" xTabline - Reduced version for vim-airline
+" Plugin: https://github.com/mg979/vim-xtabline
+" MIT License Copyright (C) 2018-2020 Gianmaria Bajo <mg1979.git@gmail.com>
+" tabpagecd:
+" expanded version by mg979
+" MIT License Copyright (C) 2012-2013 Kana Natsuno <http://whileimautomaton.net/>
+" MIT License Copyright (C) 2018-2020 Gianmaria Bajo <mg1979.git@gmail.com>
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+
+function! airline#extensions#tabline#xtabline#init()
+
+    let s:state = 0
+
+    " initialize mappings
+    call airline#extensions#tabline#xtabline#maps()
+
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+    " Variables
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+    let g:loaded_xtabline = 1
+    let s:most_recent = -1
+    let s:xtabline_filtering = 1
+
+    let t:xtl_excluded = get(g:, 'airline#extensions#tabline#exclude_buffers', [])
+    let t:xtl_accepted = []
+
+    let g:xtabline_include_previews = get(g:, 'xtabline_include_previews', 1)
+
+    let g:xtabline_alt_action = get(g:, 'xtabline_alt_action', "buffer #")
+
+
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+    " Autocommands
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+    augroup plugin-xtabline
+        autocmd!
+
+        autocmd TabNew    * call s:Do('new')
+        autocmd TabEnter  * call s:Do('enter')
+        autocmd TabLeave  * call s:Do('leave')
+        autocmd TabClosed * call s:Do('close')
+
+        autocmd BufEnter  * let g:xtabline_changing_buffer = 0
+        autocmd BufAdd,BufDelete,BufWrite * call airline#extensions#tabline#xtabline#filter_buffers()
+    augroup END
+
+
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+    " Commands
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+    com! XTabReopen call airline#extensions#tabline#xtabline#reopen_last_tab()
+
+endfunction
+
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+" Mappings
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! airline#extensions#tabline#xtabline#maps()
+
+    if !exists('g:xtabline_disable_keybindings')
+
+        fun! s:mapkeys(keys, plug)
+            if empty(mapcheck(a:keys)) && !hasmapto(a:plug)
+                silent! execute 'nmap <unique> '.a:keys.' '.a:plug
+            endif
+        endfun
+
+        call s:mapkeys('<F5>','<Plug>XTablineToggleTabs')
+        call s:mapkeys('<leader><F5>','<Plug>XTablineToggleFiltering')
+        call s:mapkeys('<BS>','<Plug>XTablineSelectBuffer')
+        call s:mapkeys(']l','<Plug>XTablineNextBuffer')
+        call s:mapkeys('[l','<Plug>XTablinePrevBuffer')
+        call s:mapkeys('<leader>tr','<Plug>XTablineReopen')
+    endif
+
+    nnoremap <unique> <script> <Plug>XTablineToggleTabs <SID>ToggleTabs
+    nnoremap <silent> <SID>ToggleTabs :call airline#extensions#tabline#xtabline#toggle_tabs()<cr>
+
+    nnoremap <unique> <script> <Plug>XTablineToggleFiltering <SID>ToggleFiltering
+    nnoremap <silent> <SID>ToggleFiltering :call airline#extensions#tabline#xtabline#toggle_buffers()<cr>
+
+    nnoremap <unique> <script> <Plug>XTablineSelectBuffer <SID>SelectBuffer
+    nnoremap <silent> <expr> <SID>SelectBuffer g:xtabline_changing_buffer ? "\<C-c>" : ":<C-u>call airline#extensions#tabline#xtabline#select_buffer(v:count)\<cr>"
+
+    nnoremap <unique> <script> <Plug>XTablineNextBuffer <SID>NextBuffer
+    nnoremap <silent> <expr> <SID>NextBuffer airline#extensions#tabline#xtabline#next_buffer(v:count1)
+
+    nnoremap <unique> <script> <Plug>XTablinePrevBuffer <SID>PrevBuffer
+    nnoremap <silent> <expr> <SID>PrevBuffer airline#extensions#tabline#xtabline#prev_buffer(v:count1)
+
+    nnoremap <unique> <script> <Plug>XTablineReopen <SID>ReopenLastTab
+    nnoremap <silent> <SID>ReopenLastTab :XTabReopen<cr>
+
+    if get(g:, 'xtabline_cd_commands', 0)
+        map <unique> <leader>cdc <Plug>XTablineCdCurrent
+        map <unique> <leader>cdd <Plug>XTablineCdDown1
+        map <unique> <leader>cd2 <Plug>XTablineCdDown2
+        map <unique> <leader>cd3 <Plug>XTablineCdDown3
+        map <unique> <leader>cdh <Plug>XTablineCdHome
+        nnoremap <unique> <script> <Plug>XTablineCdCurrent :cd %:p:h<cr>:call airline#util#doautocmd('BufAdd')<cr>:pwd<cr>
+        nnoremap <unique> <script> <Plug>XTablineCdDown1   :cd %:p:h:h<cr>:call airline#util#doautocmd('BufAdd')<cr>:pwd<cr>
+        nnoremap <unique> <script> <Plug>XTablineCdDown2   :cd %:p:h:h:h<cr>:call airline#util#doautocmd('BufAdd')<cr>:pwd<cr>
+        nnoremap <unique> <script> <Plug>XTablineCdDown3   :cd %:p:h:h:h:h<cr>:call airline#util#doautocmd('BufAdd')<cr>:pwd<cr>
+        nnoremap <unique> <script> <Plug>XTablineCdHome    :cd ~<cr>:call airline#util#doautocmd('BufAdd')<cr>:pwd<cr>
+    endif
+endfunction
+
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+" Commands functions
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! airline#extensions#tabline#xtabline#toggle_tabs()
+    """Toggle between tabs/buffers tabline."""
+
+    if tabpagenr("$") == 1 | call airline#util#warning("There is only one tab.") | return | endif
+
+    if g:airline#extensions#tabline#show_tabs
+        let g:airline#extensions#tabline#show_tabs = 0
+        call airline#util#warning("Showing buffers")
+    else
+        let g:airline#extensions#tabline#show_tabs = 1
+        call airline#util#warning("Showing tabs")
+    endif
+
+    doautocmd BufAdd
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! airline#extensions#tabline#xtabline#toggle_buffers()
+    """Toggle buffer filtering in the tabline."""
+
+    if s:xtabline_filtering
+        let s:xtabline_filtering = 0
+        let g:airline#extensions#tabline#exclude_buffers = []
+        call airline#util#warning("Buffer filtering turned off")
+        doautocmd BufAdd
+    else
+        let s:xtabline_filtering = 1
+        call airline#extensions#tabline#xtabline#filter_buffers()
+        call airline#util#warning("Buffer filtering turned on")
+        doautocmd BufAdd
+    endif
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! airline#extensions#tabline#xtabline#reopen_last_tab()
+    """Reopen the last closed tab."""
+
+    if !exists('s:most_recently_closed_tab')
+        call airline#util#warning("No recent tabs.")
+        return
+    endif
+
+    let tab = s:most_recently_closed_tab
+    tabnew
+    let empty = bufnr("%")
+    let t:cwd = tab['cwd']
+    cd `=t:cwd`
+    let t:name = tab['name']
+    for buf in tab['buffers'] | execute "badd ".buf | endfor
+    execute "edit ".tab['buffers'][0]
+    execute "bdelete ".empty
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! airline#extensions#tabline#xtabline#filter_buffers()
+    """Filter buffers so that only the ones within the tab's cwd will show up.
+
+    " 'accepted' is a list of buffer numbers, for quick access.
+    " 'excluded' is a list of buffer numbers, it will be used by Airline to hide buffers.
+
+    if !s:xtabline_filtering | return | endif
+
+    let g:airline#extensions#tabline#exclude_buffers = []
+    let t:xtl_excluded = g:airline#extensions#tabline#exclude_buffers
+    let t:xtl_accepted = [] | let accepted = t:xtl_accepted
+    let previews = g:xtabline_include_previews
+
+    " bufnr(0) is the alternate buffer
+    for buf in range(1, bufnr("$"))
+
+        if !buflisted(buf) | continue | endif
+
+        " get the path
+        let path = expand("#".buf.":p")
+
+        " confront with the cwd
+        if !previews && path =~ "^".getcwd()
+            call add(accepted, buf)
+        elseif previews && path =~ getcwd()
+            call add(accepted, buf)
+        else
+            call add(t:xtl_excluded, buf)
+        endif
+    endfor
+
+    call s:RefreshTabline()
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! airline#extensions#tabline#xtabline#next_buffer(nr)
+    """Switch to next visible buffer."""
+
+    if ( s:NotEnoughBuffers() || !s:xtabline_filtering ) | return | endif
+    let accepted = t:xtl_accepted
+
+    let ix = index(accepted, bufnr("%"))
+    let target = ix + a:nr
+    let total = len(accepted)
+
+    if ix == -1
+        " not in index, go back to most recent or back to first
+        if s:most_recent == -1 || s:most_recent >= total
+            let s:most_recent = 0
+        endif
+
+    elseif target >= total
+        " over last buffer
+        while target >= total | let target -= total | endwhile
+        let s:most_recent = target
+
+    else
+        let s:most_recent = target
+    endif
+
+    return ":buffer " . accepted[s:most_recent] . "\<cr>"
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! airline#extensions#tabline#xtabline#prev_buffer(nr)
+    """Switch to previous visible buffer."""
+
+    if ( s:NotEnoughBuffers() || !s:xtabline_filtering ) | return | endif
+    let accepted = t:xtl_accepted
+
+    let ix = index(accepted, bufnr("%"))
+    let target = ix - a:nr
+    let total = len(accepted)
+
+    if ix == -1
+        " not in index, go back to most recent or back to first
+        if s:most_recent == -1 || s:most_recent >= total
+            let s:most_recent = 0
+        endif
+
+    elseif target < 0
+        " before first buffer
+        while target < 0 | let target += total | endwhile
+        let s:most_recent = target
+
+    else
+        let s:most_recent = target
+    endif
+
+    return ":buffer " . accepted[s:most_recent] . "\<cr>"
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! airline#extensions#tabline#xtabline#select_buffer(nr)
+    """Switch to visible buffer in the tabline with [count]."""
+
+    if ( a:nr == 0 || !s:xtabline_filtering ) | execute g:xtabline_alt_action | return | endif
+    let accepted = t:xtl_accepted
+
+    if (a:nr > len(accepted)) || s:NotEnoughBuffers() || accepted[a:nr - 1] == bufnr("%")
+        return
+    else
+        let g:xtabline_changing_buffer = 1
+        execute "buffer ".accepted[a:nr - 1]
+    endif
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! s:TabBuffers()
+    """Return a list of buffers names for this tab."""
+
+    return map(copy(t:xtl_accepted), 'bufname(v:val)')
+endfunction
+
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+" Helper functions
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! s:NotEnoughBuffers()
+    """Just return if there aren't enough buffers."""
+
+    if len(t:xtl_accepted) < 2
+        if index(t:xtl_accepted, bufnr("%")) == -1
+            return
+        elseif !len(t:xtl_accepted)
+            call airline#util#warning("No available buffers for this tab.")
+        else
+            call airline#util#warning("No other available buffers for this tab.")
+        endif
+        return 1
+    endif
+endfunction
+
+function! s:RefreshTabline()
+    call airline#extensions#tabline#buflist#invalidate()
+endfunction
+
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+" TabPageCd
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+" tabpagecd - Turn :cd into :tabpagecd, to use one tab page per project
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! s:InitCwds()
+    if !exists('g:xtab_cwds') | let g:xtab_cwds = [] | endif
+
+    while len(g:xtab_cwds) < tabpagenr("$")
+        call add(g:xtab_cwds, getcwd())
+    endwhile
+    let s:state    = 1
+    let t:cwd      = getcwd()
+    let s:last_tab = 0
+    call airline#extensions#tabline#xtabline#filter_buffers()
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! airline#extensions#tabline#xtabline#update_obsession()
+    let string = 'let g:xtab_cwds = '.string(g:xtab_cwds).' | call airline#extensions#tabline#xtabline#update_obsession()'
+    if !exists('g:obsession_append')
+        let g:obsession_append = [string]
+    else
+        call filter(g:obsession_append, 'v:val !~# "^let g:xtab_cwds"')
+        call add(g:obsession_append, string)
+    endif
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+function! s:Do(action)
+    let arg = a:action
+    if !s:state | call s:InitCwds() | return | endif
+
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+    if arg == 'new'
+
+        call insert(g:xtab_cwds, getcwd(), tabpagenr()-1)
+
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+    elseif arg == 'enter'
+
+        let t:cwd =g:xtab_cwds[tabpagenr()-1]
+
+        cd `=t:cwd`
+        call airline#extensions#tabline#xtabline#filter_buffers()
+
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+    elseif arg == 'leave'
+
+        let t:cwd = getcwd()
+        let g:xtab_cwds[tabpagenr()-1] = t:cwd
+        let s:last_tab = tabpagenr() - 1
+
+        if !exists('t:name') | let t:name = t:cwd | endif
+        let s:most_recent_tab = {'cwd': t:cwd, 'name': t:name, 'buffers': s:TabBuffers()}
+
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+    elseif arg == 'close'
+
+        let s:most_recently_closed_tab = copy(s:most_recent_tab)
+        call remove(g:xtab_cwds, s:last_tab)
+    endif
+
+    """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+    call airline#extensions#tabline#xtabline#update_obsession()
+endfunction
+
+""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

autoload/airline/extensions/tagbar.vim

@@ -0,0 +1,59 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/majutsushi/tagbar
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists(':TagbarToggle')
+  finish
+endif
+
+let s:flags = get(g:, 'airline#extensions#tagbar#flags', '')
+let s:spc = g:airline_symbols.space
+let s:init=0
+
+" Arguments: current, sort, fname
+function! airline#extensions#tagbar#get_status(...)
+  let builder = airline#builder#new({ 'active': a:1 })
+  call builder.add_section('airline_a', s:spc.'Tagbar'.s:spc)
+  call builder.add_section('airline_b', s:spc.a:2.s:spc)
+  call builder.add_section('airline_c', s:spc.a:3.s:spc)
+  return builder.build()
+endfunction
+
+function! airline#extensions#tagbar#inactive_apply(...)
+  if getwinvar(a:2.winnr, '&filetype') == 'tagbar'
+    return -1
+  endif
+endfunction
+
+let s:airline_tagbar_last_lookup_time = 0
+let s:airline_tagbar_last_lookup_val = ''
+function! airline#extensions#tagbar#currenttag()
+  if get(w:, 'airline_active', 0)
+    if !s:init
+      try
+        " try to load the plugin, if filetypes are disabled,
+        " this will cause an error, so try only once
+        let a=tagbar#currenttag('%', '', '')
+      catch
+      endtry
+      unlet! a
+      let s:init=1
+    endif
+    " function tagbar#currenttag does not exist, if filetype is not enabled
+    if s:airline_tagbar_last_lookup_time != localtime() && exists("*tagbar#currenttag")
+      let s:airline_tagbar_last_lookup_val = tagbar#currenttag('%s', '', s:flags)
+      let s:airline_tagbar_last_lookup_time = localtime()
+    endif
+    return s:airline_tagbar_last_lookup_val
+  endif
+  return ''
+endfunction
+
+function! airline#extensions#tagbar#init(ext)
+  call a:ext.add_inactive_statusline_func('airline#extensions#tagbar#inactive_apply')
+  let g:tagbar_status_func = 'airline#extensions#tagbar#get_status'
+
+  call airline#parts#define_function('tagbar', 'airline#extensions#tagbar#currenttag')
+endfunction

autoload/airline/extensions/term.vim

@@ -0,0 +1,80 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+call airline#parts#define_function('tmode', 'airline#extensions#term#termmode')
+call airline#parts#define('terminal', {'text': get(g:airline_mode_map, 't', 't'), 'accent': 'bold'})
+
+let s:spc = g:airline_symbols.space
+
+let s:section_a = airline#section#create_left(['terminal', 'tmode'])
+let s:section_z = airline#section#create(['linenr', 'maxlinenr'])
+
+function! airline#extensions#term#apply(...) abort
+  if &buftype ==? 'terminal' || bufname(a:2.bufnr)[0] ==? '!'
+    call a:1.add_section_spaced('airline_a', s:section_a)
+    call a:1.add_section_spaced('airline_b', s:neoterm_id(a:2.bufnr))
+    call a:1.add_section('airline_term', s:spc.s:termname(a:2.bufnr))
+    call a:1.split()
+    call a:1.add_section('airline_y', '')
+    call a:1.add_section_spaced('airline_z', s:section_z)
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#term#inactive_apply(...) abort
+  if getbufvar(a:2.bufnr, '&buftype') ==? 'terminal'
+    call a:1.add_section_spaced('airline_a', s:section_a)
+    call a:1.add_section_spaced('airline_b', s:neoterm_id(a:2.bufnr))
+    call a:1.add_section('airline_term', s:spc.s:termname(a:2.bufnr))
+    call a:1.split()
+    call a:1.add_section('airline_y', '')
+    call a:1.add_section_spaced('airline_z', s:section_z)
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#term#termmode() abort
+  let mode = airline#parts#mode()[0]
+  if mode ==? 'T' || mode ==? '-'
+    " We don't need to output T, the statusline already says "TERMINAL".
+    " Also we don't want to output "-" on an inactive statusline.
+    let mode = ''
+  endif
+  return mode
+endfunction
+
+function! s:termname(bufnr) abort
+  let bufname = bufname(a:bufnr)
+  if has('nvim')
+    " Get rid of the leading "term", working dir and process ID.
+    " Afterwards, remove the possibly added neoterm ID.
+    return substitute(matchstr(bufname, 'term.*:\zs.*'),
+                    \ ';#neoterm-\d\+', '', '')
+  else
+    if bufname =~? 'neoterm-\d\+'
+      " Do not return a redundant buffer name, when this is a neoterm terminal.
+      return ''
+    endif
+    " Get rid of the leading "!".
+    if bufname[0] ==? '!'
+      return bufname[1:]
+    else
+      return bufname
+    endif
+  endif
+endfunction
+
+function! s:neoterm_id(bufnr) abort
+  let id = getbufvar(a:bufnr, 'neoterm_id')
+  if id !=? ''
+    let id = 'neoterm-'.id
+  endif
+  return id
+endfunction
+
+function! airline#extensions#term#init(ext) abort
+  call a:ext.add_statusline_func('airline#extensions#term#apply')
+  call a:ext.add_inactive_statusline_func('airline#extensions#term#inactive_apply')
+endfunction

autoload/airline/extensions/tmuxline.vim

@@ -0,0 +1,28 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/edkolev/tmuxline.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists(':Tmuxline')
+  finish
+endif
+
+let s:tmuxline_snapshot_file = get(g:, 'airline#extensions#tmuxline#snapshot_file', '')
+let s:color_template = get(g:, 'airline#extensions#tmuxline#color_template', 'normal')
+
+function! airline#extensions#tmuxline#init(ext)
+  call a:ext.add_theme_func('airline#extensions#tmuxline#set_tmux_colors')
+endfunction
+
+function! airline#extensions#tmuxline#set_tmux_colors(palette)
+  let color_template = has_key(a:palette, s:color_template) ? s:color_template : 'normal'
+  let mode_palette = a:palette[color_template]
+
+  let tmuxline_theme = tmuxline#api#create_theme_from_airline(mode_palette)
+  call tmuxline#api#set_theme(tmuxline_theme)
+
+  if strlen(s:tmuxline_snapshot_file)
+    call tmuxline#api#snapshot(s:tmuxline_snapshot_file)
+  endif
+endfunction

autoload/airline/extensions/undotree.vim

@@ -0,0 +1,29 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/mbbill/undotree
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists(':UndotreeToggle')
+  finish
+endif
+
+function! airline#extensions#undotree#apply(...)
+  if exists('t:undotree')
+    if &ft == 'undotree'
+      if exists('*t:undotree.GetStatusLine')
+        call airline#extensions#apply_left_override('undo', '%{exists("t:undotree") ? t:undotree.GetStatusLine() : ""}')
+      else
+        call airline#extensions#apply_left_override('undotree', '%f')
+      endif
+    endif
+
+    if &ft == 'diff' && exists('*t:diffpanel.GetStatusLine')
+      call airline#extensions#apply_left_override('diff', '%{exists("t:diffpanel") ? t:diffpanel.GetStatusLine() : ""}')
+    endif
+  endif
+endfunction
+
+function! airline#extensions#undotree#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#undotree#apply')
+endfunction

autoload/airline/extensions/unicode.vim

@@ -0,0 +1,25 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling, Christian Brabandt et al.
+" Plugin: https://github.com/chrisbra/unicode.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_unicodePlugin', 0)
+  finish
+endif
+
+function! airline#extensions#unicode#apply(...)
+  if exists(":UnicodeTable") == 2 && bufname('') ==# 'UnicodeTable'
+    call airline#parts#define('unicode', {
+          \ 'text': '[UnicodeTable]',
+          \ 'accent': 'bold' })
+    let w:airline_section_a = airline#section#create(['unicode'])
+    let w:airline_section_b = ''
+    let w:airline_section_c = ' '
+    let w:airline_section_y = ''
+  endif
+endfunction
+
+function! airline#extensions#unicode#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#unicode#apply')
+endfunction

autoload/airline/extensions/unite.vim

@@ -0,0 +1,25 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/Shougo/unite.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_unite', 0)
+  finish
+endif
+
+function! airline#extensions#unite#apply(...)
+  if &ft == 'unite'
+    call a:1.add_section('airline_a', ' Unite ')
+    call a:1.add_section('airline_b', ' %{get(unite#get_context(), "buffer_name", "")} ')
+    call a:1.add_section('airline_c', ' %{unite#get_status_string()} ')
+    call a:1.split()
+    call a:1.add_section('airline_y', ' %{get(unite#get_context(), "real_buffer_name", "")} ')
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#unite#init(ext)
+  let g:unite_force_overwrite_statusline = 0
+  call a:ext.add_statusline_func('airline#extensions#unite#apply')
+endfunction

autoload/airline/extensions/vimagit.vim

@@ -0,0 +1,30 @@
+" MIT License. Copyright (c) 2016-2020 Jerome Reybert et al.
+" Plugin: https://github.com/jreybert/vimagit
+" vim: et ts=2 sts=2 sw=2
+
+" This plugin replaces the whole section_a when in vimagit buffer
+scriptencoding utf-8
+
+if !get(g:, 'loaded_magit', 0)
+  finish
+endif
+
+let s:commit_mode = {'ST': 'STAGING', 'CC': 'COMMIT', 'CA': 'AMEND'}
+
+function! airline#extensions#vimagit#init(ext) abort
+  call a:ext.add_statusline_func('airline#extensions#vimagit#apply')
+endfunction
+
+function! airline#extensions#vimagit#get_mode() abort
+  if ( exists("*magit#get_current_mode") )
+    return magit#get_current_mode()
+  else
+    return get(s:commit_mode, b:magit_current_commit_mode, '???')
+  endif
+endfunction
+
+function! airline#extensions#vimagit#apply(...) abort
+  if ( &filetype == 'magit' )
+    let w:airline_section_a = '%{airline#extensions#vimagit#get_mode()}'
+  endif
+endfunction

autoload/airline/extensions/vimcmake.vim

@@ -0,0 +1,30 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/cdelledonne/vim-cmake
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#vimcmake#init(ext) abort
+  call a:ext.add_statusline_func('airline#extensions#vimcmake#apply')
+  call a:ext.add_inactive_statusline_func('airline#extensions#vimcmake#inactive_apply')
+endfunction
+
+function! airline#extensions#vimcmake#apply(...) abort
+  if &filetype ==# 'vimcmake'
+    let spc = g:airline_symbols.space
+    call a:1.add_section('airline_a', spc.'CMake'.spc)
+    call a:1.add_section('airline_b', spc.'%{cmake#statusline#GetBuildInfo(1)}'.spc)
+    call a:1.add_section('airline_c', spc.'%{cmake#statusline#GetCmdInfo()}'.spc)
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#vimcmake#inactive_apply(...) abort
+  if getbufvar(a:2.bufnr, '&filetype') ==# 'vimcmake'
+    let spc = g:airline_symbols.space
+    call a:1.add_section('airline_a', spc.'[CMake]')
+    call a:1.add_section('airline_b', spc.'%{cmake#statusline#GetBuildInfo(0)}')
+    call a:1.add_section('airline_c', spc.'%{cmake#statusline#GetCmdInfo()}')
+    return 1
+  endif
+endfunction

autoload/airline/extensions/vimtex.vim

@@ -0,0 +1,84 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/lervag/vimtex
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:spc = g:airline_symbols.space
+
+function! s:SetDefault(var, val)
+  if !exists(a:var)
+    execute 'let ' . a:var . '=' . string(a:val)
+  endif
+endfunction
+
+" Left and right delimiters (added only when status string is not empty)
+call s:SetDefault( 'g:airline#extensions#vimtex#left',       "{")
+call s:SetDefault( 'g:airline#extensions#vimtex#right',      "}")
+
+" The current tex file is the main project file
+call s:SetDefault( 'g:airline#extensions#vimtex#main',       "" )
+"
+" The current tex file is a subfile of the project
+" and the compilation is set for the main file
+call s:SetDefault( 'g:airline#extensions#vimtex#sub_main',   "m")
+"
+" The current tex file is a subfile of the project
+" and the compilation is set for this subfile
+call s:SetDefault( 'g:airline#extensions#vimtex#sub_local',  "l")
+"
+" Compilation is running and continuous compilation is off
+call s:SetDefault( 'g:airline#extensions#vimtex#compiled',   "c₁")
+
+" Compilation is running and continuous compilation is on
+call s:SetDefault( 'g:airline#extensions#vimtex#continuous', "c")
+
+" Viewer is opened
+call s:SetDefault( 'g:airline#extensions#vimtex#viewer',     "v")
+
+function! airline#extensions#vimtex#init(ext)
+  call airline#parts#define_raw('vimtex', '%{airline#extensions#vimtex#get_scope()}')
+  call a:ext.add_statusline_func('airline#extensions#vimtex#apply')
+endfunction
+
+function! airline#extensions#vimtex#apply(...)
+  if exists("b:vimtex")
+    let w:airline_section_x = get(w:, 'airline_section_x', g:airline_section_x)
+    let w:airline_section_x.=s:spc.g:airline_left_alt_sep.s:spc.'%{airline#extensions#vimtex#get_scope()}'
+  endif
+endfunction
+
+function! airline#extensions#vimtex#get_scope()
+  let l:status = ''
+
+  let vt_local = get(b:, 'vimtex_local', {})
+  if empty(vt_local)
+    let l:status .= g:airline#extensions#vimtex#main
+  else
+    if get(vt_local, 'active')
+      let l:status .= g:airline#extensions#vimtex#sub_local
+    else
+      let l:status .= g:airline#extensions#vimtex#sub_main
+    endif
+  endif
+
+  if get(get(get(b:, 'vimtex', {}), 'viewer', {}), 'xwin_id')
+    let l:status .= g:airline#extensions#vimtex#viewer
+  endif
+
+  let l:compiler = get(get(b:, 'vimtex', {}), 'compiler', {})
+  if !empty(l:compiler)
+    if has_key(l:compiler, 'is_running') && b:vimtex.compiler.is_running()
+      if get(l:compiler, 'continuous')
+        let l:status .= g:airline#extensions#vimtex#continuous
+      else
+        let l:status .= g:airline#extensions#vimtex#compiled
+      endif
+    endif
+  endif
+
+  if !empty(l:status)
+    let l:status = g:airline#extensions#vimtex#left . l:status . g:airline#extensions#vimtex#right
+  endif
+  return l:status
+endfunction

autoload/airline/extensions/virtualenv.vim

@@ -0,0 +1,32 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/jmcantrell/vim-virtualenv
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:spc = g:airline_symbols.space
+
+function! airline#extensions#virtualenv#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#virtualenv#apply')
+endfunction
+
+function! airline#extensions#virtualenv#apply(...)
+  if &filetype =~# "python"
+    if get(g:, 'virtualenv_loaded', 0)
+      let statusline = virtualenv#statusline()
+    else
+      let statusline = fnamemodify($VIRTUAL_ENV, ':t')
+    endif
+    if !empty(statusline)
+      call airline#extensions#append_to_section('x',
+            \ s:spc.g:airline_right_alt_sep.s:spc.statusline)
+    endif
+  endif
+endfunction
+
+function! airline#extensions#virtualenv#update()
+  if &filetype =~# "python"
+    call airline#extensions#virtualenv#apply()
+    call airline#update_statusline()
+  endif
+endfunction

autoload/airline/extensions/vista.vim

@@ -0,0 +1,18 @@
+" MIT License. Copyright (c) 2020 s1341 (github@shmarya.net)
+" Plugin: https://github.com/liuchengxu/vista.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+if !get(g:, 'loaded_vista', 0)
+  finish
+endif
+
+function! airline#extensions#vista#currenttag() abort
+  if get(w:, 'airline_active', 0)
+    return airline#util#shorten(get(b:, 'vista_nearest_method_or_function', ''), 91, 9)
+  endif
+endfunction
+
+function! airline#extensions#vista#init(ext) abort
+  call airline#parts#define_function('vista', 'airline#extensions#vista#currenttag')
+endfunction

autoload/airline/extensions/whitespace.vim

@@ -0,0 +1,193 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+" http://got-ravings.blogspot.com/2008/10/vim-pr0n-statusline-whitespace-flags.html
+
+scriptencoding utf-8
+
+let s:show_message = get(g:, 'airline#extensions#whitespace#show_message', 1)
+let s:symbol = get(g:, 'airline#extensions#whitespace#symbol', g:airline_symbols.whitespace)
+let s:default_checks = ['indent', 'trailing', 'mixed-indent-file', 'conflicts']
+
+let s:enabled = get(g:, 'airline#extensions#whitespace#enabled', 1)
+let s:skip_check_ft = {'make': ['indent', 'mixed-indent-file'],
+      \ 'csv': ['indent', 'mixed-indent-file']}
+
+function! s:check_mixed_indent()
+  let indent_algo = get(g:, 'airline#extensions#whitespace#mixed_indent_algo', 0)
+  if indent_algo == 1
+    " [<tab>]<space><tab>
+    " spaces before or between tabs are not allowed
+    let t_s_t = '(^\t* +\t\s*\S)'
+    " <tab>(<space> x count)
+    " count of spaces at the end of tabs should be less than tabstop value
+    let t_l_s = '(^\t+ {' . &ts . ',}' . '\S)'
+    return search('\v' . t_s_t . '|' . t_l_s, 'nw')
+  elseif indent_algo == 2
+    return search('\v(^\t* +\t\s*\S)', 'nw', 0, 500)
+  else
+    return search('\v(^\t+ +)|(^ +\t+)', 'nw', 0, 500)
+  endif
+endfunction
+
+function! s:check_mixed_indent_file()
+  let c_like_langs = get(g:, 'airline#extensions#c_like_langs',
+        \ [ 'arduino', 'c', 'cpp', 'cuda', 'go', 'javascript', 'ld', 'php' ])
+  if index(c_like_langs, &ft) > -1
+    " for C-like languages: allow /** */ comment style with one space before the '*'
+    let head_spc = '\v(^ +\*@!)'
+  else
+    let head_spc = '\v(^ +)'
+  endif
+  let indent_tabs = search('\v(^\t+)', 'nw')
+  let indent_spc  = search(head_spc, 'nw')
+  if indent_tabs > 0 && indent_spc > 0
+    return printf("%d:%d", indent_tabs, indent_spc)
+  else
+    return ''
+  endif
+endfunction
+
+function! s:conflict_marker()
+  " Checks for git conflict markers
+  let annotation = '\%([0-9A-Za-z_.:]\+\)\?'
+  if &ft is# 'rst'
+    " rst filetypes use '=======' as header
+    let pattern = '^\%(\%(<\{7} '.annotation. '\)\|\%(>\{7\} '.annotation.'\)\)$'
+  else
+    let pattern = '^\%(\%(<\{7} '.annotation. '\)\|\%(=\{7\}\)\|\%(>\{7\} '.annotation.'\)\)$'
+  endif
+  return search(pattern, 'nw')
+endfunction
+
+function! airline#extensions#whitespace#check()
+  let max_lines = get(g:, 'airline#extensions#whitespace#max_lines', 20000)
+  if &readonly || !&modifiable || !s:enabled || line('$') > max_lines
+          \ || get(b:, 'airline_whitespace_disabled', 0)
+    return ''
+  endif
+  let skip_check_ft = extend(s:skip_check_ft,
+        \ get(g:, 'airline#extensions#whitespace#skip_indent_check_ft', {}), 'force')
+
+  if !exists('b:airline_whitespace_check')
+    let b:airline_whitespace_check = ''
+    let checks = get(b:, 'airline_whitespace_checks', get(g:, 'airline#extensions#whitespace#checks', s:default_checks))
+
+    let trailing = 0
+    let check = 'trailing'
+    if index(checks, check) > -1 && index(get(skip_check_ft, &ft, []), check) < 0
+      try
+        let regexp = get(g:, 'airline#extensions#whitespace#trailing_regexp', '\s$')
+        let trailing = search(regexp, 'nw')
+      catch
+        call airline#util#warning(printf('Whitespace: error occurred evaluating "%s"', regexp))
+        echomsg v:exception
+        return ''
+      endtry
+    endif
+
+    let mixed = 0
+    let check = 'indent'
+    if index(checks, check) > -1 && index(get(skip_check_ft, &ft, []), check) < 0
+      let mixed = s:check_mixed_indent()
+    endif
+
+    let mixed_file = ''
+    let check = 'mixed-indent-file'
+    if index(checks, check) > -1 && index(get(skip_check_ft, &ft, []), check) < 0
+      let mixed_file = s:check_mixed_indent_file()
+    endif
+
+    let long = 0
+    if index(checks, 'long') > -1 && &tw > 0
+      let long = search('\%>'.&tw.'v.\+', 'nw')
+    endif
+
+    let conflicts = 0
+    if index(checks, 'conflicts') > -1
+      let conflicts = s:conflict_marker()
+    endif
+
+    if trailing != 0 || mixed != 0 || long != 0 || !empty(mixed_file) || conflicts != 0
+      let b:airline_whitespace_check = s:symbol
+      if strlen(s:symbol) > 0
+        let space = (g:airline_symbols.space)
+      else
+        let space = ''
+      endif
+
+      if s:show_message
+        if trailing != 0
+          let trailing_fmt = get(g:, 'airline#extensions#whitespace#trailing_format', '[%s]trailing')
+          let b:airline_whitespace_check .= space.printf(trailing_fmt, trailing)
+        endif
+        if mixed != 0
+          let mixed_indent_fmt = get(g:, 'airline#extensions#whitespace#mixed_indent_format', '[%s]mixed-indent')
+          let b:airline_whitespace_check .= space.printf(mixed_indent_fmt, mixed)
+        endif
+        if long != 0
+          let long_fmt = get(g:, 'airline#extensions#whitespace#long_format', '[%s]long')
+          let b:airline_whitespace_check .= space.printf(long_fmt, long)
+        endif
+        if !empty(mixed_file)
+          let mixed_indent_file_fmt = get(g:, 'airline#extensions#whitespace#mixed_indent_file_format', '[%s]mix-indent-file')
+          let b:airline_whitespace_check .= space.printf(mixed_indent_file_fmt, mixed_file)
+        endif
+        if conflicts != 0
+          let conflicts_fmt = get(g:, 'airline#extensions#whitespace#conflicts_format', '[%s]conflicts')
+          let b:airline_whitespace_check .= space.printf(conflicts_fmt, conflicts)
+        endif
+      endif
+    endif
+  endif
+  return airline#util#shorten(b:airline_whitespace_check, 120, 9)
+endfunction
+
+function! airline#extensions#whitespace#toggle()
+  if s:enabled
+    augroup airline_whitespace
+      autocmd!
+    augroup END
+    augroup! airline_whitespace
+    let s:enabled = 0
+  else
+    call airline#extensions#whitespace#init()
+    let s:enabled = 1
+  endif
+
+  if exists("g:airline#extensions#whitespace#enabled")
+    let g:airline#extensions#whitespace#enabled = s:enabled
+    if s:enabled && match(g:airline_section_warning, '#whitespace#check') < 0
+      let g:airline_section_warning .= airline#section#create(['whitespace'])
+      call airline#update_statusline()
+    endif
+  endif
+  call airline#util#warning(printf('Whitespace checking: %s',(s:enabled ? 'Enabled' : 'Disabled')))
+endfunction
+
+function! airline#extensions#whitespace#disable()
+  if s:enabled
+    call airline#extensions#whitespace#toggle()
+  endif
+endfunction
+
+function! airline#extensions#whitespace#init(...)
+  call airline#parts#define_function('whitespace', 'airline#extensions#whitespace#check')
+
+  unlet! b:airline_whitespace_check
+  augroup airline_whitespace
+    autocmd!
+    autocmd CursorHold,BufWritePost * call <sid>ws_refresh()
+  augroup END
+endfunction
+
+function! s:ws_refresh()
+  if get(b:, 'airline_ws_changedtick', 0) == b:changedtick
+    return
+  endif
+  unlet! b:airline_whitespace_check
+  if get(g:, 'airline_skip_empty_sections', 0)
+    exe ':AirlineRefresh!'
+  endif
+  let b:airline_ws_changedtick = b:changedtick
+endfunction

autoload/airline/extensions/windowswap.vim

@@ -0,0 +1,30 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" Plugin: https://github.com/wesQ3/vim-windowswap
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists('g:loaded_windowswap')
+  finish
+endif
+
+let s:spc = g:airline_symbols.space
+
+if !exists('g:airline#extensions#windowswap#indicator_text')
+  let g:airline#extensions#windowswap#indicator_text = 'WS'
+endif
+
+function! airline#extensions#windowswap#init(ext)
+  call airline#parts#define_function('windowswap', 'airline#extensions#windowswap#get_status')
+endfunction
+
+function! airline#extensions#windowswap#get_status()
+  " use new tab-aware api if WS is up to date
+  let s:mark = exists('*WindowSwap#IsCurrentWindowMarked') ?
+    \WindowSwap#IsCurrentWindowMarked() :
+    \(WindowSwap#HasMarkedWindow() && WindowSwap#GetMarkedWindowNum() == winnr())
+  if s:mark
+    return g:airline#extensions#windowswap#indicator_text.s:spc
+  endif
+  return ''
+endfunction

autoload/airline/extensions/wordcount.vim

@@ -0,0 +1,118 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2 fdm=marker
+
+scriptencoding utf-8
+
+" get wordcount {{{1
+if exists('*wordcount')
+  function! s:get_wordcount(visual_mode_active)
+    if get(g:, 'actual_curbuf', '') != bufnr('')
+      return
+    endif
+    let query = a:visual_mode_active ? 'visual_words' : 'words'
+    return get(wordcount(), query, 0)
+  endfunction
+else  " Pull wordcount from the g_ctrl-g stats
+  function! s:get_wordcount(visual_mode_active)
+    let pattern = a:visual_mode_active
+          \ ? '^.\D*\d\+\D\+\d\+\D\+\zs\d\+'
+          \ : '^.\D*\%(\d\+\D\+\)\{5}\zs\d\+'
+
+    let save_status = v:statusmsg
+    if !a:visual_mode_active && col('.') == col('$')
+      let save_pos = getpos('.')
+      execute "silent normal! g\<c-g>"
+      call setpos('.', save_pos)
+    else
+      execute "silent normal! g\<c-g>"
+    endif
+    let stats = v:statusmsg
+    let v:statusmsg = save_status
+
+    return str2nr(matchstr(stats, pattern))
+  endfunction
+endif
+
+" format {{{1
+let s:formatter = get(g:, 'airline#extensions#wordcount#formatter', 'default')
+
+" wrapper function for compatibility; redefined below for old-style formatters
+function! s:format_wordcount(wordcount)
+  return airline#extensions#wordcount#formatters#{s:formatter}#to_string(a:wordcount)
+endfunction
+
+" check user-defined formatter exists with appropriate functions, otherwise
+" fall back to default
+if s:formatter !=# 'default'
+  execute 'runtime! autoload/airline/extensions/wordcount/formatters/'.s:formatter.'.vim'
+  if !exists('*airline#extensions#wordcount#formatters#{s:formatter}#to_string')
+    if !exists('*airline#extensions#wordcount#formatters#{s:formatter}#format')
+      let s:formatter = 'default'
+    else
+      " redefine for backwords compatibility
+      function! s:format_wordcount(_)
+        if mode() ==? 'v'
+          return b:airline_wordcount
+        else
+          return airline#extensions#wordcount#formatters#{s:formatter}#format()
+        endif
+      endfunction
+    endif
+  endif
+endif
+
+" update {{{1
+let s:wordcount_cache = 0  " cache wordcount for performance when force_update=0
+function! s:update_wordcount(force_update)
+  let wordcount = s:get_wordcount(0)
+  if wordcount != s:wordcount_cache || a:force_update
+    let s:wordcount_cache = wordcount
+    let b:airline_wordcount =  s:format_wordcount(wordcount)
+  endif
+endfunction
+
+function airline#extensions#wordcount#get()
+  if get(g:, 'airline#visual_active', 0)
+    return s:format_wordcount(s:get_wordcount(1))
+  else
+    if get(b:, 'airline_changedtick', 0) != b:changedtick
+      call s:update_wordcount(0)
+      let b:airline_changedtick = b:changedtick
+    endif
+    return get(b:, 'airline_wordcount', '')
+  endif
+endfunction
+
+" airline functions {{{1
+" default filetypes:
+function! airline#extensions#wordcount#apply(...)
+  let filetypes = get(g:, 'airline#extensions#wordcount#filetypes', 
+    \ ['asciidoc', 'help', 'mail', 'markdown', 'nroff', 'org', 'rst', 'plaintex', 'tex', 'text'])
+  " export current filetypes settings to global namespace
+  let g:airline#extensions#wordcount#filetypes = filetypes
+
+  " Check if filetype needs testing
+  if did_filetype()
+    " correctly test for compound filetypes (e.g. markdown.pandoc)
+    let ft = substitute(&filetype, '\.', '\\|', 'g')
+
+    " Select test based on type of "filetypes": new=list, old=string
+    if type(filetypes) == get(v:, 't_list', type([]))
+          \ ? match(filetypes, '\<'. ft. '\>') > -1 || index(filetypes, 'all') > -1
+          \ : match(&filetype, filetypes) > -1
+      let b:airline_changedtick = -1
+      call s:update_wordcount(1) " force update: ensures initial worcount exists
+    elseif exists('b:airline_wordcount') " cleanup when filetype is removed
+      unlet b:airline_wordcount
+    endif
+  endif
+
+  if exists('b:airline_wordcount')
+    call airline#extensions#prepend_to_section(
+          \ 'z', '%{airline#extensions#wordcount#get()}')
+  endif
+endfunction
+
+function! airline#extensions#wordcount#init(ext)
+  call a:ext.add_statusline_func('airline#extensions#wordcount#apply')
+endfunction

autoload/airline/extensions/wordcount/formatters/default.vim

@@ -0,0 +1,47 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#wordcount#formatters#default#update_fmt(...)
+  let s:fmt = get(g:, 'airline#extensions#wordcount#formatter#default#fmt', '%s words')
+  let s:fmt_short = get(g:, 'airline#extensions#wordcount#formatter#default#fmt_short', s:fmt == '%s words' ? '%sW' : s:fmt)
+endfunction
+
+" Reload format when statusline is rebuilt
+call airline#extensions#wordcount#formatters#default#update_fmt()
+
+if index(g:airline_statusline_funcrefs, function('airline#extensions#wordcount#formatters#default#update_fmt')) == -1
+  " only add it, if not already done
+  call airline#add_statusline_funcref(function('airline#extensions#wordcount#formatters#default#update_fmt'))
+endif
+
+if match(get(v:, 'lang', ''), '\v\cC|en') > -1
+  let s:decimal_group = ','
+elseif match(get(v:, 'lang', ''), '\v\cde|dk|fr|pt') > -1
+  let s:decimal_group = '.'
+else
+  let s:decimal_group = ''
+endif
+
+function! airline#extensions#wordcount#formatters#default#to_string(wordcount)
+  if airline#util#winwidth() > 85
+    if a:wordcount > 999
+      " Format number according to locale, e.g. German: 1.245 or English: 1,245
+      let wordcount = substitute(a:wordcount, '\d\@<=\(\(\d\{3\}\)\+\)$', s:decimal_group.'&', 'g')
+    else
+      let wordcount = a:wordcount
+    endif
+    let str = printf(s:fmt, wordcount)
+  else
+    let str = printf(s:fmt_short, a:wordcount)
+  endif
+
+  let str .= g:airline_symbols.space
+
+  if !empty(g:airline_right_alt_sep)
+    let str .= g:airline_right_alt_sep . g:airline_symbols.space
+  endif
+
+  return str
+endfunction

autoload/airline/extensions/wordcount/formatters/readingtime.vim

@@ -0,0 +1,47 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! airline#extensions#wordcount#formatters#readingtime#update_fmt(...) abort
+  let s:fmt = get(g:, 'airline#extensions#wordcount#formatter#readingtime#fmt', 'About %s minutes')
+  let s:fmt_short = get(g:, 'airline#extensions#wordcount#formatter#readingtime#fmt_short', s:fmt ==# 'About %s minutes' ? '%sW' : s:fmt)
+endfunction
+
+" Reload format when statusline is rebuilt
+call airline#extensions#wordcount#formatters#readingtime#update_fmt()
+
+if index(g:airline_statusline_funcrefs, function('airline#extensions#wordcount#formatters#readingtime#update_fmt')) == -1
+  " only add it, if not already done
+  call airline#add_statusline_funcref(function('airline#extensions#wordcount#formatters#readingtime#update_fmt'))
+endif
+
+if match(get(v:, 'lang', ''), '\v\cC|en') > -1
+  let s:decimal_group = ','
+elseif match(get(v:, 'lang', ''), '\v\cde|dk|fr|pt') > -1
+  let s:decimal_group = '.'
+else
+  let s:decimal_group = ''
+endif
+
+function! airline#extensions#wordcount#formatters#readingtime#to_string(wordcount) abort
+  if airline#util#winwidth() > 85
+    if a:wordcount > 999
+      " Format number according to locale, e.g. German: 1.245 or English: 1,245
+      let wordcount = substitute(a:wordcount, '\d\@<=\(\(\d\{3\}\)\+\)$', s:decimal_group.'&', 'g')
+    else
+      let wordcount = a:wordcount
+    endif
+    let str = printf(s:fmt, ceil(wordcount / 200.0))
+  else
+    let str = printf(s:fmt_short, ceil(a:wordcount / 200.0))
+  endif
+
+  let str .= g:airline_symbols.space
+
+  if !empty(g:airline_right_alt_sep)
+    let str .= g:airline_right_alt_sep . g:airline_symbols.space
+  endif
+
+  return str
+endfunction

autoload/airline/extensions/xkblayout.vim

@@ -0,0 +1,24 @@
+" MIT License. Copyright (c) 2017-2020 YoungHoon Rhiu et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !exists('g:XkbSwitchLib')
+  finish
+endif
+
+function! airline#extensions#xkblayout#status()
+  let keyboard_layout = libcall(g:XkbSwitchLib, 'Xkb_Switch_getXkbLayout', '')
+  let keyboard_layout = get(split(keyboard_layout, '\.'), -1, '')
+  let short_codes = get(g:, 'airline#extensions#xkblayout#short_codes', {'2SetKorean': 'KR', 'Chinese': 'CN', 'Japanese': 'JP'})
+
+  if has_key(short_codes, keyboard_layout)
+    let keyboard_layout = short_codes[keyboard_layout]
+  endif
+
+  return keyboard_layout
+endfunction
+
+function! airline#extensions#xkblayout#init(ext)
+  call airline#parts#define_function('xkblayout', 'airline#extensions#xkblayout#status')
+endfunction

autoload/airline/extensions/ycm.vim

@@ -0,0 +1,42 @@
+" MIT License. Copyright (c) 2015-2020 Evgeny Firsov et al.
+" Plugin: https://github.com/ycm-core/YouCompleteMe
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_youcompleteme', 0)
+  finish
+endif
+
+let s:spc = g:airline_symbols.space
+let s:error_symbol = get(g:, 'airline#extensions#ycm#error_symbol', 'E:')
+let s:warning_symbol = get(g:, 'airline#extensions#ycm#warning_symbol', 'W:')
+
+function! airline#extensions#ycm#init(ext)
+  call airline#parts#define_function('ycm_error_count', 'airline#extensions#ycm#get_error_count')
+  call airline#parts#define_function('ycm_warning_count', 'airline#extensions#ycm#get_warning_count')
+endfunction
+
+function! airline#extensions#ycm#get_error_count() abort
+  if exists("*youcompleteme#GetErrorCount")
+    let cnt = youcompleteme#GetErrorCount()
+
+    if cnt != 0
+      return s:error_symbol.cnt
+    endif
+  endif
+
+  return ''
+endfunction
+
+function! airline#extensions#ycm#get_warning_count()
+  if exists("*youcompleteme#GetWarningCount")
+    let cnt = youcompleteme#GetWarningCount()
+
+    if cnt != 0
+      return s:warning_symbol.cnt.s:spc
+    endif
+  endif
+
+  return ''
+endfunction

autoload/airline/extensions/zoomwintab.vim

@@ -0,0 +1,27 @@
+" MIT License. Copyright (c) 2020 Dmitry Geurkov (d.geurkov@gmail.com)
+" Plugin: https://github.com/troydm/zoomwintab.vim
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+
+" Avoid installing twice
+if exists('g:loaded_vim_airline_zoomwintab')
+  finish
+endif
+
+let g:loaded_vim_airline_zoomwintab = 1
+
+let s:zoomwintab_status_zoomed_in =
+  \ get(g:, 'airline#extensions#zoomwintab#status_zoomed_in', g:airline_left_alt_sep.' Zoomed')
+let s:zoomwintab_status_zoomed_out =
+  \ get(g:, 'airline#extensions#zoomwintab#status_zoomed_out', '')
+
+function! airline#extensions#zoomwintab#apply(...) abort
+  call airline#extensions#prepend_to_section('gutter',
+    \ exists('t:zoomwintab') ? s:zoomwintab_status_zoomed_in : s:zoomwintab_status_zoomed_out)
+endfunction
+
+function! airline#extensions#zoomwintab#init(ext) abort
+  call a:ext.add_statusline_func('airline#extensions#zoomwintab#apply')
+endfunction

autoload/airline/formatter/short_path.vim

@@ -0,0 +1,8 @@
+scriptencoding utf-8
+
+function! airline#formatter#short_path#format(val) abort
+  if get(g:, 'airline_stl_path_style', 'default') ==# 'short'
+    return '%{pathshorten(expand("'.a:val.'"))}'
+  endif
+  return a:val
+endfunction

autoload/airline/highlighter.vim

@@ -0,0 +1,629 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling Christian Brabandt et al.
+" vim: et ts=2 sts=2 sw=2 fdm=marker et
+
+scriptencoding utf-8
+
+let s:is_win32term = (has('win32') || has('win64')) &&
+                   \ !has('gui_running') &&
+                   \ (empty($CONEMUBUILD) || &term !=? 'xterm') &&
+                   \ empty($WTSESSION) &&
+                   \ !(exists("+termguicolors") && &termguicolors)
+
+let s:separators = {}
+let s:accents = {}
+let s:hl_groups = {}
+
+if !exists(":def") || (exists(":def") && get(g:, "airline_experimental", 0)==0)
+  " Legacy VimScript implementation {{{1
+  function! s:gui2cui(rgb, fallback) abort " {{{2
+    if a:rgb == ''
+      return a:fallback
+    elseif match(a:rgb, '^\%(NONE\|[fb]g\)$') > -1
+      return a:rgb
+    endif
+    let rgb = map(split(a:rgb[1:], '..\zs'), '0 + ("0x".v:val)')
+    return airline#msdos#round_msdos_colors(rgb)
+  endfunction
+  function! s:group_not_done(list, name) abort " {{{2
+    if index(a:list, a:name) == -1
+      call add(a:list, a:name)
+      return 1
+    else
+      if &vbs
+        echomsg printf("airline: group: %s already done, skipping", a:name)
+      endif
+      return 0
+    endif
+  endfu
+  function! s:get_syn(group, what, mode) abort "{{{2
+    let color = ''
+    if hlexists(a:group)
+      let color = synIDattr(synIDtrans(hlID(a:group)), a:what, a:mode)
+    endif
+    if empty(color) || color == -1
+      " should always exist
+      let color = synIDattr(synIDtrans(hlID('Normal')), a:what, a:mode)
+      " however, just in case
+      if empty(color) || color == -1
+        let color = 'NONE'
+      endif
+    endif
+    return color
+  endfunction
+  function! s:get_array(guifg, guibg, ctermfg, ctermbg, opts) abort " {{{2
+    return [ a:guifg, a:guibg, a:ctermfg, a:ctermbg, empty(a:opts) ? '' : join(a:opts, ',') ]
+  endfunction
+  function! airline#highlighter#reset_hlcache() abort " {{{2
+    let s:hl_groups = {}
+  endfunction
+  function! airline#highlighter#get_highlight(group, ...) abort " {{{2
+    " only check for the cterm reverse attribute
+    " TODO: do we need to check all modes (gui, term, as well)?
+    let reverse = synIDattr(synIDtrans(hlID(a:group)), 'reverse', 'cterm')
+    if get(g:, 'airline_highlighting_cache', 0) && has_key(s:hl_groups, a:group)
+      let res = s:hl_groups[a:group]
+      return reverse ? [ res[1], res[0], res[3], res[2], res[4] ] : res
+    else
+      let ctermfg = s:get_syn(a:group, 'fg', 'cterm')
+      let ctermbg = s:get_syn(a:group, 'bg', 'cterm')
+      let guifg = s:get_syn(a:group, 'fg', 'gui')
+      let guibg = s:get_syn(a:group, 'bg', 'gui')
+      let bold = synIDattr(synIDtrans(hlID(a:group)), 'bold')
+      if reverse
+        let res = s:get_array(guibg, guifg, ctermbg, ctermfg, bold ? ['bold'] : a:000)
+      else
+        let res = s:get_array(guifg, guibg, ctermfg, ctermbg, bold ? ['bold'] : a:000)
+      endif
+    endif
+    let s:hl_groups[a:group] = res
+    return res
+  endfunction
+  function! airline#highlighter#get_highlight2(fg, bg, ...) abort " {{{2
+    let guifg = s:get_syn(a:fg[0], a:fg[1], 'gui')
+    let guibg = s:get_syn(a:bg[0], a:bg[1], 'gui')
+    let ctermfg = s:get_syn(a:fg[0], a:fg[1], 'cterm')
+    let ctermbg = s:get_syn(a:bg[0], a:bg[1], 'cterm')
+    return s:get_array(guifg, guibg, ctermfg, ctermbg, a:000)
+  endfunction
+  function! s:hl_group_exists(group) abort " {{{2
+    if !hlexists(a:group)
+      return 0
+    elseif empty(synIDattr(synIDtrans(hlID(a:group)), 'fg'))
+      return 0
+    endif
+    return 1
+  endfunction
+  function! airline#highlighter#exec(group, colors) abort " {{{2
+    if pumvisible()
+      return
+    endif
+    let colors = a:colors
+    if s:is_win32term
+      let colors[2] = s:gui2cui(get(colors, 0, ''), get(colors, 2, ''))
+      let colors[3] = s:gui2cui(get(colors, 1, ''), get(colors, 3, ''))
+    endif
+    let old_hi = airline#highlighter#get_highlight(a:group)
+    if len(colors) == 4
+      call add(colors, '')
+    endif
+    let new_hi = [colors[0], colors[1], printf('%s', colors[2]), printf('%s', colors[3]), colors[4]]
+    let colors = s:CheckDefined(colors)
+    if old_hi != new_hi || !s:hl_group_exists(a:group)
+      let cmd = printf('hi %s%s', a:group, s:GetHiCmd(colors))
+      try
+        exe cmd
+      catch
+        echoerr "Error when running command: ". cmd
+      endtry
+      if has_key(s:hl_groups, a:group)
+        let s:hl_groups[a:group] = colors
+      endif
+    endif
+  endfunction
+  function! s:CheckDefined(colors) abort " {{{2
+    " Checks, whether the definition of the colors is valid and is not empty or NONE
+    " e.g. if the colors would expand to this:
+    " hi airline_c ctermfg=NONE ctermbg=NONE
+    " that means to clear that highlighting group, therefore, fallback to Normal
+    " highlighting group for the cterm values
+
+    " This only works, if the Normal highlighting group is actually defined, so
+    " return early, if it has been cleared
+    if !exists("g:airline#highlighter#normal_fg_hi")
+      let g:airline#highlighter#normal_fg_hi = synIDattr(synIDtrans(hlID('Normal')), 'fg', 'cterm')
+    endif
+    if empty(g:airline#highlighter#normal_fg_hi) || g:airline#highlighter#normal_fg_hi < 0
+      return a:colors
+    endif
+
+    for val in a:colors
+      if !empty(val) && val !=# 'NONE'
+        return a:colors
+      endif
+    endfor
+    " this adds the bold attribute to the term argument of the :hi command,
+    " but at least this makes sure, the group will be defined
+    let fg = g:airline#highlighter#normal_fg_hi
+    let bg = synIDattr(synIDtrans(hlID('Normal')), 'bg', 'cterm')
+    if bg < 0
+      " in case there is no background color defined for Normal
+      let bg = a:colors[3]
+    endif
+    return a:colors[0:1] + [fg, bg] + [a:colors[4]]
+  endfunction
+  function! s:GetHiCmd(list) abort " {{{2
+    " a:list needs to have 5 items!
+    let res = ''
+    let i = -1
+    while i < 4
+      let i += 1
+      let item = get(a:list, i, '')
+      if item is ''
+        continue
+      endif
+      if i == 0
+        let res .= ' guifg='.item
+      elseif i == 1
+        let res .= ' guibg='.item
+      elseif i == 2
+        let res .= ' ctermfg='.item
+      elseif i == 3
+        let res .= ' ctermbg='.item
+      elseif i == 4
+        let res .= printf(' gui=%s cterm=%s term=%s', item, item, item)
+      endif
+    endwhile
+    return res
+  endfunction
+  function! s:exec_separator(dict, from, to, inverse, suffix) abort " {{{2
+    if pumvisible()
+      return
+    endif
+    let group = a:from.'_to_'.a:to.a:suffix
+    let from = airline#themes#get_highlight(a:from.a:suffix)
+    let to = airline#themes#get_highlight(a:to.a:suffix)
+    if a:inverse
+      let colors = [ from[1], to[1], from[3], to[3] ]
+    else
+      let colors = [ to[1], from[1], to[3], from[3] ]
+    endif
+    let a:dict[group] = colors
+    call airline#highlighter#exec(group, colors)
+  endfunction
+  function! airline#highlighter#load_theme() abort " {{{2
+    if pumvisible()
+      return
+    endif
+    for winnr in filter(range(1, winnr('$')), 'v:val != winnr()')
+      call airline#highlighter#highlight_modified_inactive(winbufnr(winnr))
+    endfor
+    call airline#highlighter#highlight(['inactive'])
+    if getbufvar( bufnr('%'), '&modified'  )
+      call airline#highlighter#highlight(['normal', 'modified'])
+    else
+      call airline#highlighter#highlight(['normal'])
+    endif
+  endfunction
+  function! airline#highlighter#add_separator(from, to, inverse) abort " {{{2
+    let s:separators[a:from.a:to] = [a:from, a:to, a:inverse]
+    call <sid>exec_separator({}, a:from, a:to, a:inverse, '')
+  endfunction
+  function! airline#highlighter#add_accent(accent) abort " {{{2
+    let s:accents[a:accent] = 1
+  endfunction
+  function! airline#highlighter#highlight_modified_inactive(bufnr) abort " {{{2
+    if getbufvar(a:bufnr, '&modified')
+      let colors = exists('g:airline#themes#{g:airline_theme}#palette.inactive_modified.airline_c')
+            \ ? g:airline#themes#{g:airline_theme}#palette.inactive_modified.airline_c : []
+    else
+      let colors = exists('g:airline#themes#{g:airline_theme}#palette.inactive.airline_c')
+            \ ? g:airline#themes#{g:airline_theme}#palette.inactive.airline_c : []
+    endif
+
+    if !empty(colors)
+      call airline#highlighter#exec('airline_c'.(a:bufnr).'_inactive', colors)
+    endif
+  endfunction
+  function! airline#highlighter#highlight(modes, ...) abort " {{{2
+    let bufnr = a:0 ? a:1 : ''
+    let p = g:airline#themes#{g:airline_theme}#palette
+
+    " draw the base mode, followed by any overrides
+    let mapped = map(a:modes, 'v:val == a:modes[0] ? v:val : a:modes[0]."_".v:val')
+    let suffix = a:modes[0] == 'inactive' ? '_inactive' : ''
+    let airline_grouplist = []
+    let buffers_in_tabpage = sort(tabpagebuflist())
+    if exists("*uniq")
+      let buffers_in_tabpage = uniq(buffers_in_tabpage)
+    endif
+    " mapped might be something like ['normal', 'normal_modified']
+    " if a group is in both modes available, only define the second
+    " that is how this was done previously overwrite the previous definition
+    for mode in reverse(mapped)
+      if exists('g:airline#themes#{g:airline_theme}#palette[mode]')
+        let dict = g:airline#themes#{g:airline_theme}#palette[mode]
+        for kvp in items(dict)
+          let mode_colors = kvp[1]
+          let name = kvp[0]
+          if name is# 'airline_c' && !empty(bufnr) && suffix is# '_inactive'
+            let name = 'airline_c'.bufnr
+          endif
+          " do not re-create highlighting for buffers that are no longer visible
+          " in the current tabpage
+          if name =~# 'airline_c\d\+'
+            let bnr = matchstr(name, 'airline_c\zs\d\+') + 0
+            if bnr > 0 && index(buffers_in_tabpage, bnr) == -1
+              continue
+            endif
+          elseif (name =~# '_to_') || (name[0:10] is# 'airline_tab' && !empty(suffix))
+            " group will be redefined below at exec_separator
+            " or is not needed for tabline with '_inactive' suffix
+            " since active flag is 1 for builder)
+            continue
+          endif
+          if s:group_not_done(airline_grouplist, name.suffix)
+            call airline#highlighter#exec(name.suffix, mode_colors)
+          endif
+
+          if !has_key(p, 'accents')
+            " work around a broken installation
+            " shouldn't actually happen, p should always contain accents
+            continue
+          endif
+
+          for accent in keys(s:accents)
+            if !has_key(p.accents, accent)
+              continue
+            endif
+            let colors = copy(mode_colors)
+            if p.accents[accent][0] != ''
+              let colors[0] = p.accents[accent][0]
+            endif
+            if p.accents[accent][2] != ''
+              let colors[2] = p.accents[accent][2]
+            endif
+            if len(colors) >= 5
+              let colors[4] = get(p.accents[accent], 4, '')
+            else
+              call add(colors, get(p.accents[accent], 4, ''))
+            endif
+            if s:group_not_done(airline_grouplist, name.suffix.'_'.accent)
+              call airline#highlighter#exec(name.suffix.'_'.accent, colors)
+            endif
+          endfor
+        endfor
+
+        if empty(s:separators)
+          " nothing to be done
+          continue
+        endif
+        " TODO: optimize this
+        for sep in items(s:separators)
+          " we cannot check, that the group already exists, else the separators
+          " might not be correctly defined. But perhaps we can skip above groups
+          " that match the '_to_' name, because they would be redefined here...
+          call <sid>exec_separator(dict, sep[1][0], sep[1][1], sep[1][2], suffix)
+        endfor
+      endif
+    endfor
+  endfunction
+
+  finish
+else
+  " This is using Vim9 script " {{{1
+  def s:gui2cui(rgb: string, fallback: string): string # {{{2
+    if empty(rgb)
+      return fallback
+    elseif match(rgb, '^\%(NONE\|[fb]g\)$') > -1
+      return rgb
+    endif
+    var _rgb = []
+    _rgb = map(split(rgb[1:], '..\zs'), {_, v -> ("0x" .. v)->str2nr(16)})
+    return airline#msdos#round_msdos_colors(_rgb)
+  enddef
+  def s:group_not_done(list: list<string>, name: string): bool # {{{2
+    if index(list, name) == -1
+      add(list, name)
+      return true
+    else
+      if &vbs
+        :echomsg printf("airline: group: %s already done, skipping", name)
+      endif
+      return false
+    endif
+  enddef
+  def s:get_syn(group: string, what: string, mode: string): string # {{{2
+    var color = ''
+    if hlexists(group)
+      color = hlID(group)->synIDtrans()->synIDattr(what, mode)
+    endif
+    if empty(color) || str2nr(color) == -1
+      # Normal highlighting group should always exist
+      color = hlID('Normal')->synIDtrans()->synIDattr(what, mode)
+      # however, just in case
+      if empty(color) || str2nr(color) == -1
+        color = 'NONE'
+      endif
+    endif
+    return color
+  enddef
+  def s:get_array(guifg: string, guibg: string, ctermfg: string, ctermbg: string, opts: list<string>): list<string> # {{{2
+    return [ guifg, guibg, ctermfg, ctermbg, empty(opts) ? '' : join(opts, ',') ]
+  enddef
+  def airline#highlighter#reset_hlcache(): void # {{{2
+    s:hl_groups = {}
+  enddef
+  def airline#highlighter#get_highlight(group: string, rest: list<string> = ['']): list<string> # {{{2
+    # only check for the cterm reverse attribute
+    # TODO: do we need to check all modes (gui, term, as well)?
+    var reverse = false
+    var res = []
+    var ctermfg: string
+    var ctermbg: string
+    var guifg: string
+    var guibg: string
+    var bold: bool
+    if hlID(group)->synIDtrans()->synIDattr('reverse', 'cterm')->str2nr()
+      reverse = true
+    endif
+    if get(g:, 'airline_highlighting_cache', 0) && has_key(s:hl_groups, group)
+      res = s:hl_groups[group]
+      return reverse ? [ res[1], res[0], res[3], res[2], res[4] ] : res
+    else
+      ctermfg = s:get_syn(group, 'fg', 'cterm')
+      ctermbg = s:get_syn(group, 'bg', 'cterm')
+      guifg = s:get_syn(group, 'fg', 'gui')
+      guibg = s:get_syn(group, 'bg', 'gui')
+      if hlID(group)->synIDtrans()->synIDattr('bold')->str2nr()
+        bold = true
+      endif
+      if reverse
+        res = s:get_array(guibg, guifg, ctermbg, ctermfg, bold ? ['bold'] : rest)
+      else
+        res = s:get_array(guifg, guibg, ctermfg, ctermbg, bold ? ['bold'] : rest)
+      endif
+    endif
+    s:hl_groups[group] = res
+    return res
+  enddef
+  def airline#highlighter#get_highlight2(fg: list<string>, bg: list<string>, rest1: string = '', rest2: string = '', rest3: string = ''): list<string> # {{{2
+    var guifg = s:get_syn(fg[0], fg[1], 'gui')
+    var guibg = s:get_syn(bg[0], bg[1], 'gui')
+    var ctermfg = s:get_syn(fg[0], fg[1], 'cterm')
+    var ctermbg = s:get_syn(bg[0], bg[1], 'cterm')
+    var rest = [ rest1, rest2, rest3 ]
+    return s:get_array(guifg, guibg, ctermfg, ctermbg, filter(rest, {_, v -> !empty(v)}))
+  enddef
+  def s:hl_group_exists(group: string): bool # {{{2
+    if !hlexists(group)
+      return false
+    elseif hlID(group)->synIDtrans()->synIDattr('fg')->empty()
+      return false
+    endif
+    return true
+  enddef
+  def s:CheckDefined(colors: list<any>): list<any> # {{{2
+    # Checks, whether the definition of the colors is valid and is not empty or NONE
+    # e.g. if the colors would expand to this:
+    # hi airline_c ctermfg=NONE ctermbg=NONE
+    # that means to clear that highlighting group, therefore, fallback to Normal
+    # highlighting group for the cterm values
+
+    # This only works, if the Normal highlighting group is actually defined,
+    # so return early, if it has been cleared
+    if !exists("g:airline#highlighter#normal_fg_hi")
+      g:airline#highlighter#normal_fg_hi = hlID('Normal')->synIDtrans()->synIDattr('fg', 'cterm')
+    endif
+    if empty(g:airline#highlighter#normal_fg_hi) || str2nr(g:airline#highlighter#normal_fg_hi) < 0
+      return colors
+    endif
+
+    for val in colors
+      if !empty(val) && val !=# 'NONE'
+        return colors
+      endif
+    endfor
+    # this adds the bold attribute to the term argument of the :hi command,
+    # but at least this makes sure, the group will be defined
+    var fg = g:airline#highlighter#normal_fg_hi
+    var bg = hlID('Normal')->synIDtrans()->synIDattr('bg', 'cterm')
+    if str2nr(bg) < 0
+      # in case there is no background color defined for Normal
+      bg = colors[3]
+    endif
+    return colors[0:1] + [fg, bg] + [colors[4]]
+  enddef
+  def s:GetHiCmd(list: list<string>): string # {{{2
+    # list needs to have 5 items!
+    var res: string
+    var i = -1
+    var item: string
+    while i < 4
+      i += 1
+      item = get(list, i, '')
+      if item is ''
+        continue
+      endif
+      if i == 0
+        res = res .. ' guifg=' .. item
+      elseif i == 1
+        res = res .. ' guibg=' .. item
+      elseif i == 2
+        res = res .. ' ctermfg=' .. item
+      elseif i == 3
+        res = res .. ' ctermbg=' .. item
+      elseif i == 4
+        res = res .. printf(' gui=%s cterm=%s term=%s', item, item, item)
+      endif
+    endwhile
+    return res
+  enddef
+  def airline#highlighter#exec(group: string, clrs: list<any>): void # {{{2
+    # TODO: is clrs: list<any> correct? Should probably be list<number> instead
+    #       convert all themes to use strings in cterm color definition
+    if pumvisible()
+      return
+    endif
+    var colors: list<string>
+    colors = map(copy(clrs), { _, v -> type(v) != type('') ? string(v) : v})
+    if len(colors) == 4
+      add(colors, '')
+    endif
+    if s:is_win32term
+      colors[2] = s:gui2cui(get(colors, 0, ''), get(colors, 2, ''))
+      colors[3] = s:gui2cui(get(colors, 1, ''), get(colors, 3, ''))
+    endif
+    var old_hi: list<string> = airline#highlighter#get_highlight(group)
+    var new_hi: list<string> = colors
+    colors = s:CheckDefined(colors)
+    if old_hi != new_hi || !s:hl_group_exists(group)
+      var cmd = ''
+      cmd = printf('hi %s%s', group, s:GetHiCmd(colors))
+      :exe cmd
+      if has_key(s:hl_groups, group)
+        s:hl_groups[group] = colors
+      endif
+    endif
+  enddef
+  def s:exec_separator(dict: dict<any>, from_arg: string, to_arg: string, inverse: bool, suffix: string): void # {{{2
+    if pumvisible()
+      return
+    endif
+    var group = from_arg .. '_to_' .. to_arg .. suffix
+    var from = map(airline#themes#get_highlight(from_arg .. suffix),
+      {_, v -> type(v) != type('') ? string(v) : v})
+    var colors = []
+    var to = map(airline#themes#get_highlight(to_arg .. suffix),
+      {_, v -> type(v) != type('') ? string(v) : v})
+    if inverse
+      colors = [ from[1], to[1], from[3], to[3] ]
+    else
+      colors = [ to[1], from[1], to[3], from[3] ]
+    endif
+    dict[group] = colors
+    airline#highlighter#exec(group, colors)
+  enddef
+  def airline#highlighter#load_theme(): void # {{{2
+    if pumvisible()
+      return
+    endif
+    for winnr in filter(range(1, winnr('$')), {_, v -> v != winnr()})
+      airline#highlighter#highlight_modified_inactive(winbufnr(winnr))
+    endfor
+    airline#highlighter#highlight(['inactive'])
+    if getbufvar( bufnr('%'), '&modified'  )
+      airline#highlighter#highlight(['normal', 'modified'])
+    else
+      airline#highlighter#highlight(['normal'])
+    endif
+  enddef
+  def airline#highlighter#add_separator(from: string, to: string, inverse: bool): void # {{{2
+    s:separators[from .. to] = [from, to, inverse]
+    s:exec_separator({}, from, to, inverse, '')
+  enddef
+  def airline#highlighter#add_accent(accent: string): void # {{{2
+    s:accents[accent] = 1
+  enddef
+  def airline#highlighter#highlight_modified_inactive(bufnr: number): void # {{{2
+    var colors: list<any>
+    var dict1  = eval('g:airline#themes#' .. g:airline_theme .. '#palette')->get('inactive_modified', {})
+    var dict2  = eval('g:airline#themes#' .. g:airline_theme .. '#palette')->get('inactive', {})
+
+    if empty(dict2)
+      return
+    endif
+
+    if getbufvar(bufnr, '&modified')
+      colors = get(dict1, 'airline_c', [])
+    else
+      colors = get(dict2, 'airline_c', [])
+    endif
+    if !empty(colors)
+      airline#highlighter#exec('airline_c' .. bufnr .. '_inactive', colors)
+    endif
+  enddef
+  def airline#highlighter#highlight(modes: list<string>, bufnr: string = ''): void # {{{2
+    var p: dict<any> = eval('g:airline#themes#' .. g:airline_theme .. '#palette')
+
+    # draw the base mode, followed by any overrides
+    var mapped = map(modes, {_, v -> v == modes[0] ? v : modes[0] .. "_" .. v})
+    var suffix = ''
+    if modes[0] == 'inactive'
+      suffix = '_inactive'
+    endif
+    var airline_grouplist = []
+    var dict: dict<any>
+    var bnr: number = 0
+
+    var buffers_in_tabpage: list<number> = uniq(sort(tabpagebuflist()))
+    # mapped might be something like ['normal', 'normal_modified']
+    # if a group is in both modes available, only define the second
+    # that is how this was done previously overwrite the previous definition
+    for mode in reverse(mapped)
+      if exists('g:airline#themes#' .. g:airline_theme .. '#palette.' .. mode)
+        dict = eval('g:airline#themes#' .. g:airline_theme .. '#palette.' .. mode)
+        for kvp in items(dict)
+          var mode_colors = kvp[1]
+          var name = kvp[0]
+          if name == 'airline_c' && !empty(bufnr) && suffix == '_inactive'
+            name = 'airline_c' .. bufnr
+          endif
+          # do not re-create highlighting for buffers that are no longer visible
+          # in the current tabpage
+          if name =~# 'airline_c\d\+'
+            bnr = str2nr(matchstr(name, 'airline_c\zs\d\+'))
+            if bnr > 0 && index(buffers_in_tabpage, bnr) == -1
+              continue
+            endif
+          elseif (name =~ '_to_') || (name[0:10] == 'airline_tab' && !empty(suffix))
+            # group will be redefined below at exec_separator
+            # or is not needed for tabline with '_inactive' suffix
+            # since active flag is 1 for builder)
+            continue
+          endif
+          if s:group_not_done(airline_grouplist, name .. suffix)
+            airline#highlighter#exec(name .. suffix, mode_colors)
+          endif
+
+          if !has_key(p, 'accents')
+            # shouldn't actually happen, p should always contain accents
+            continue
+          endif
+
+          for accent in keys(s:accents)
+            if !has_key(p.accents, accent)
+              continue
+            endif
+            var colors = copy(mode_colors)
+            if p.accents[accent][0] != ''
+                colors[0] = p.accents[accent][0]
+            endif
+            if type(get(p.accents[accent], 2, '')) == type('')
+              colors[2] = get(p.accents[accent], 2, '')
+            else
+              colors[2] = string(p.accents[accent][2])
+            endif
+            if len(colors) >= 5
+              colors[4] = get(p.accents[accent], 4, '')
+            else
+              add(colors, get(p.accents[accent], 4, ''))
+            endif
+            if s:group_not_done(airline_grouplist, name .. suffix .. '_' .. accent)
+              airline#highlighter#exec(name .. suffix .. '_' .. accent, colors)
+            endif
+          endfor
+        endfor
+
+        if empty(s:separators)
+          continue
+        endif
+        for sep in items(s:separators)
+          # we cannot check, that the group already exists, else the separators
+          # might not be correctly defined. But perhaps we can skip above groups
+          # that match the '_to_' name, because they would be redefined here...
+          s:exec_separator(dict, sep[1][0], sep[1][1], sep[1][2], suffix)
+        endfor
+      endif
+    endfor
+  enddef
+endif " }}}1

autoload/airline/init.vim

@@ -0,0 +1,228 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+function! s:check_defined(variable, default)
+  if !exists(a:variable)
+    let {a:variable} = a:default
+  endif
+endfunction
+
+let s:loaded = 0
+function! airline#init#bootstrap()
+  if s:loaded
+    return
+  endif
+  let s:loaded = 1
+
+  let g:airline#init#bootstrapping = 1
+
+  let g:airline#init#vim_async = (v:version >= 800 && has('job'))
+  let g:airline#init#is_windows = has('win32') || has('win64')
+
+  call s:check_defined('g:airline_detect_modified', 1)
+  call s:check_defined('g:airline_detect_paste', 1)
+  call s:check_defined('g:airline_detect_crypt', 1)
+  call s:check_defined('g:airline_detect_spell', 1)
+  call s:check_defined('g:airline_detect_spelllang', 1)
+  call s:check_defined('g:airline_detect_iminsert', 0)
+  call s:check_defined('g:airline_inactive_collapse', 1)
+  call s:check_defined('g:airline_exclude_filenames', ['DebuggerWatch','DebuggerStack','DebuggerStatus'])
+  call s:check_defined('g:airline_exclude_filetypes', [])
+  call s:check_defined('g:airline_exclude_preview', 0)
+
+  call s:check_defined('g:airline_mode_map', {})
+  call extend(g:airline_mode_map, {
+        \ '__' : '------',
+        \ 'c'  : 'COMMAND',
+        \ 'i'  : 'INSERT',
+        \ 'ic' : 'INSERT COMPL',
+        \ 'ix' : 'INSERT COMPL',
+        \ 'multi' : 'MULTI',
+        \ 'n'  : 'NORMAL',
+        \ 'ni' : '(INSERT)',
+        \ 'no' : 'OP PENDING',
+        \ 'R'  : 'REPLACE',
+        \ 'Rv' : 'V REPLACE',
+        \ 's'  : 'SELECT',
+        \ 'S'  : 'S-LINE',
+        \ '' : 'S-BLOCK',
+        \ 't'  : 'TERMINAL',
+        \ 'v'  : 'VISUAL',
+        \ 'V'  : 'V-LINE',
+        \ '' : 'V-BLOCK',
+        \ }, 'keep')
+
+  call s:check_defined('g:airline_theme_map', {})
+  call extend(g:airline_theme_map, {
+        \ 'default': 'dark',
+        \ '\CTomorrow': 'tomorrow',
+        \ 'base16': 'base16',
+        \ 'mo[l|n]okai': 'molokai',
+        \ 'wombat': 'wombat',
+        \ 'zenburn': 'zenburn',
+        \ 'solarized': 'solarized',
+        \ 'flattened': 'solarized',
+        \ '\CNeoSolarized': 'solarized',
+        \ }, 'keep')
+
+  call s:check_defined('g:airline_symbols', {})
+  " First define the symbols,
+  " that are common in Powerline/Unicode/ASCII mode,
+  " then add specific symbols for either mode
+  call extend(g:airline_symbols, {
+          \ 'paste': 'PASTE',
+          \ 'spell': 'SPELL',
+          \ 'modified': '+',
+          \ 'space': ' ',
+          \ 'keymap': 'Keymap:',
+          \ 'ellipsis': '...'
+          \  }, 'keep')
+
+  if get(g:, 'airline_powerline_fonts', 0)
+    " Symbols for Powerline terminals
+    call s:check_defined('g:airline_left_sep', "\ue0b0")      " 
+    call s:check_defined('g:airline_left_alt_sep', "\ue0b1")  " 
+    call s:check_defined('g:airline_right_sep', "\ue0b2")     " 
+    call s:check_defined('g:airline_right_alt_sep', "\ue0b3") " 
+    " ro=, ws=☲, lnr=☰, mlnr=, br=, nx=Ɇ, crypt=🔒, dirty=⚡
+    call extend(g:airline_symbols, {
+          \ 'readonly': "\ue0a2",
+          \ 'whitespace': "\u2632",
+          \ 'linenr': "\u2630 ",
+          \ 'maxlinenr': " \ue0a1",
+          \ 'branch': "\ue0a0",
+          \ 'notexists': "\u0246",
+          \ 'dirty': "\u26a1",
+          \ 'crypt': nr2char(0x1F512),
+          \ }, 'keep')
+  elseif &encoding==?'utf-8' && !get(g:, "airline_symbols_ascii", 0)
+    " Symbols for Unicode terminals
+    call s:check_defined('g:airline_left_sep', "")
+    call s:check_defined('g:airline_left_alt_sep', "")
+    call s:check_defined('g:airline_right_sep', "")
+    call s:check_defined('g:airline_right_alt_sep', "")
+    " ro=⊝, ws=☲, lnr=☰, mlnr=㏑, br=ᚠ, nx=Ɇ, crypt=🔒
+    call extend(g:airline_symbols, {
+          \ 'readonly': "\u229D",
+          \ 'whitespace': "\u2632",
+          \ 'linenr': "\u2630 ",
+          \ 'maxlinenr': " \u33D1",
+          \ 'branch': "\u16A0",
+          \ 'notexists': "\u0246",
+          \ 'crypt': nr2char(0x1F512),
+          \ 'dirty': '!',
+          \ }, 'keep')
+  else
+    " Symbols for ASCII terminals
+    call s:check_defined('g:airline_left_sep', "")
+    call s:check_defined('g:airline_left_alt_sep', "")
+    call s:check_defined('g:airline_right_sep', "")
+    call s:check_defined('g:airline_right_alt_sep', "")
+    call extend(g:airline_symbols, {
+          \ 'readonly': 'RO',
+          \ 'whitespace': '!',
+          \ 'linenr': 'ln ',
+          \ 'maxlinenr': ' :',
+          \ 'branch': '',
+          \ 'notexists': '?',
+          \ 'crypt': 'cr',
+          \ 'dirty': '!',
+          \ }, 'keep')
+  endif
+
+  call airline#parts#define('mode', {
+        \ 'function': 'airline#parts#mode',
+        \ 'accent': 'bold',
+        \ })
+  call airline#parts#define_function('iminsert', 'airline#parts#iminsert')
+  call airline#parts#define_function('paste', 'airline#parts#paste')
+  call airline#parts#define_function('crypt', 'airline#parts#crypt')
+  call airline#parts#define_function('spell', 'airline#parts#spell')
+  call airline#parts#define_function('filetype', 'airline#parts#filetype')
+  call airline#parts#define('readonly', {
+        \ 'function': 'airline#parts#readonly',
+        \ 'accent': 'red',
+        \ })
+  call airline#parts#define_raw('file', airline#formatter#short_path#format('%f%m'))
+  call airline#parts#define_raw('path', '%F%m')
+  call airline#parts#define('linenr', {
+        \ 'raw': '%{g:airline_symbols.linenr}%l',
+        \ 'accent': 'bold'})
+  call airline#parts#define('maxlinenr', {
+        \ 'raw': '/%L%{g:airline_symbols.maxlinenr}',
+        \ 'accent': 'bold'})
+  call airline#parts#define_function('ffenc', 'airline#parts#ffenc')
+  call airline#parts#define('hunks', {
+        \ 'raw': '',
+        \ 'minwidth': 100})
+  call airline#parts#define('branch', {
+        \ 'raw': '',
+        \ 'minwidth': 80})
+  call airline#parts#define('coc_status', {
+        \ 'raw': '',
+        \ 'accent': 'bold'
+        \ })
+  call airline#parts#define_empty(['obsession', 'tagbar', 'syntastic-warn',
+        \ 'syntastic-err', 'eclim', 'whitespace','windowswap',
+        \ 'ycm_error_count', 'ycm_warning_count', 'neomake_error_count',
+        \ 'neomake_warning_count', 'ale_error_count', 'ale_warning_count',
+        \ 'lsp_error_count', 'lsp_warning_count',
+        \ 'nvimlsp_error_count', 'nvimlsp_warning_count',
+        \ 'languageclient_error_count', 'languageclient_warning_count',
+        \ 'coc_warning_count', 'coc_error_count', 'vista', 'battery'])
+  call airline#parts#define_text('bookmark', '')
+  call airline#parts#define_text('capslock', '')
+  call airline#parts#define_text('gutentags', '')
+  call airline#parts#define_text('gen_tags', '')
+  call airline#parts#define_text('grepper', '')
+  call airline#parts#define_text('xkblayout', '')
+  call airline#parts#define_text('keymap', '')
+  call airline#parts#define_text('omnisharp', '')
+
+  unlet g:airline#init#bootstrapping
+endfunction
+
+function! airline#init#sections()
+  let spc = g:airline_symbols.space
+  if !exists('g:airline_section_a')
+    let g:airline_section_a = airline#section#create_left(['mode', 'crypt', 'paste', 'keymap', 'spell', 'capslock', 'xkblayout', 'iminsert'])
+  endif
+  if !exists('g:airline_section_b')
+    if airline#util#winwidth() > 99
+      let g:airline_section_b = airline#section#create(['hunks', 'branch', 'battery'])
+    else
+      let g:airline_section_b = airline#section#create(['hunks', 'branch'])
+    endif
+  endif
+  if !exists('g:airline_section_c')
+    if exists("+autochdir") && &autochdir == 1
+      let g:airline_section_c = airline#section#create(['%<', 'path', spc, 'readonly', 'coc_status'])
+    else
+      let g:airline_section_c = airline#section#create(['%<', 'file', spc, 'readonly', 'coc_status'])
+    endif
+  endif
+  if !exists('g:airline_section_gutter')
+    let g:airline_section_gutter = airline#section#create(['%='])
+  endif
+  if !exists('g:airline_section_x')
+    let g:airline_section_x = airline#section#create_right(['bookmark', 'tagbar', 'vista', 'gutentags', 'gen_tags', 'omnisharp', 'grepper', 'filetype'])
+  endif
+  if !exists('g:airline_section_y')
+    let g:airline_section_y = airline#section#create_right(['ffenc'])
+  endif
+  if !exists('g:airline_section_z')
+    if airline#util#winwidth() > 79
+      let g:airline_section_z = airline#section#create(['windowswap', 'obsession', '%p%%'.spc, 'linenr', 'maxlinenr', ':%v'])
+    else
+      let g:airline_section_z = airline#section#create(['%p%%'.spc, 'linenr',  ':%v'])
+    endif
+  endif
+  if !exists('g:airline_section_error')
+    let g:airline_section_error = airline#section#create(['ycm_error_count', 'syntastic-err', 'eclim', 'neomake_error_count', 'ale_error_count', 'lsp_error_count', 'nvimlsp_error_count', 'languageclient_error_count', 'coc_error_count'])
+  endif
+  if !exists('g:airline_section_warning')
+    let g:airline_section_warning = airline#section#create(['ycm_warning_count',  'syntastic-warn', 'neomake_warning_count', 'ale_warning_count', 'lsp_warning_count', 'nvimlsp_warning_count', 'languageclient_warning_count', 'whitespace', 'coc_warning_count'])
+  endif
+endfunction

autoload/airline/msdos.vim

@@ -0,0 +1,79 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling Christian Brabandt et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+" basic 16 msdos from MSDOS
+" see output of color, should be
+"     0    Black
+"     1    DarkBlue
+"     2    DarkGreen
+"     3    DarkCyan
+"     4    DarkRed
+"     5    DarkMagenta
+"     6    Brown
+"     7    LightGray
+"     8    DarkGray
+"     9    Blue
+"     10   Green
+"     11   Cyan
+"     12   Red
+"     13   Magenta
+"     14   Yellow
+"     15   White
+
+const s:basic16 = [
+  \ [ 0x00, 0x00, 0x00 ],
+  \ [ 0x00, 0x00, 0x80 ],
+  \ [ 0x00, 0x80, 0x00 ],
+  \ [ 0x00, 0x80, 0x80 ],
+  \ [ 0x80, 0x00, 0x00 ],
+  \ [ 0x80, 0x00, 0x80 ],
+  \ [ 0x80, 0x80, 0x00 ],
+  \ [ 0xC0, 0xC0, 0xC0 ],
+  \ [ 0x80, 0x80, 0x80 ],
+  \ [ 0x00, 0x00, 0xFF ],
+  \ [ 0x00, 0xFF, 0x00 ],
+  \ [ 0x00, 0xFF, 0xFF ],
+  \ [ 0xFF, 0x00, 0x00 ],
+  \ [ 0xFF, 0x00, 0xFF ],
+  \ [ 0xFF, 0xFF, 0x00 ],
+  \ [ 0xFF, 0xFF, 0xFF ]
+  \ ]
+
+if exists(":def")
+  def airline#msdos#round_msdos_colors(rgblist: list<number>): string
+    # Check for values from MSDOS 16 color terminal
+    var best = []
+    var min  = 100000
+    var t = 0
+    for value in s:basic16
+      t = abs(value[0] - rgblist[0]) +
+          abs(value[1] - rgblist[1]) +
+          abs(value[2] - rgblist[2])
+      if min > t
+        min = t
+        best = value
+      endif
+    endfor
+    return string(index(s:basic16, best))
+  enddef
+  finish
+endif
+
+function! airline#msdos#round_msdos_colors(rgblist)
+  " Check for values from MSDOS 16 color terminal
+  let best = []
+  let min  = 100000
+  let list = s:basic16
+  for value in list
+    let t = abs(value[0] - a:rgblist[0]) +
+          \ abs(value[1] - a:rgblist[1]) +
+          \ abs(value[2] - a:rgblist[2])
+    if min > t
+      let min = t
+      let best = value
+    endif
+  endfor
+  return index(s:basic16, best)
+endfunction

autoload/airline/parts.vim

@@ -0,0 +1,117 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+let s:parts = {}
+
+" PUBLIC API {{{
+
+function! airline#parts#define(key, config)
+  let s:parts[a:key] = get(s:parts, a:key, {})
+  if exists('g:airline#init#bootstrapping')
+    call extend(s:parts[a:key], a:config, 'keep')
+  else
+    call extend(s:parts[a:key], a:config, 'force')
+  endif
+endfunction
+
+function! airline#parts#define_function(key, name)
+  call airline#parts#define(a:key, { 'function': a:name })
+endfunction
+
+function! airline#parts#define_text(key, text)
+  call airline#parts#define(a:key, { 'text': a:text })
+endfunction
+
+function! airline#parts#define_raw(key, raw)
+  call airline#parts#define(a:key, { 'raw': a:raw })
+endfunction
+
+function! airline#parts#define_minwidth(key, width)
+  call airline#parts#define(a:key, { 'minwidth': a:width })
+endfunction
+
+function! airline#parts#define_condition(key, predicate)
+  call airline#parts#define(a:key, { 'condition': a:predicate })
+endfunction
+
+function! airline#parts#define_accent(key, accent)
+  call airline#parts#define(a:key, { 'accent': a:accent })
+endfunction
+
+function! airline#parts#define_empty(keys)
+  for key in a:keys
+    call airline#parts#define_raw(key, '')
+  endfor
+endfunction
+
+function! airline#parts#get(key)
+  return get(s:parts, a:key, {})
+endfunction
+
+" }}}
+
+function! airline#parts#mode()
+  return airline#util#shorten(get(w:, 'airline_current_mode', ''), 79, 1)
+endfunction
+
+function! airline#parts#crypt()
+  return g:airline_detect_crypt && exists("+key") && !empty(&key) ? g:airline_symbols.crypt : ''
+endfunction
+
+function! airline#parts#paste()
+  return g:airline_detect_paste && &paste ? g:airline_symbols.paste : ''
+endfunction
+
+function! airline#parts#spell()
+  let spelllang = g:airline_detect_spelllang ? printf(" [%s]", toupper(substitute(&spelllang, ',', '/', 'g'))) : ''
+  if g:airline_detect_spell && &spell
+    let winwidth = airline#util#winwidth()
+    if winwidth >= 90
+      return g:airline_symbols.spell . spelllang
+    elseif winwidth >= 70
+      return g:airline_symbols.spell
+    else
+      return split(g:airline_symbols.spell, '\zs')[0]
+    endif
+  endif
+  return ''
+endfunction
+
+function! airline#parts#iminsert()
+  if g:airline_detect_iminsert && &iminsert && exists('b:keymap_name')
+    return toupper(b:keymap_name)
+  endif
+  return ''
+endfunction
+
+function! airline#parts#readonly()
+  " only consider regular buffers (e.g. ones that represent actual files,
+  " but not special ones like e.g. NERDTree)
+  if !empty(&buftype) || airline#util#ignore_buf(bufname('%'))
+    return ''
+  endif
+  if &readonly && !filereadable(bufname('%'))
+    return '[noperm]'
+  else
+    return &readonly ? g:airline_symbols.readonly : ''
+  endif
+endfunction
+
+function! airline#parts#filetype()
+  return (airline#util#winwidth() < 90 && strlen(&filetype) > 3)
+        \ ? matchstr(&filetype, '...'). (&encoding is? 'utf-8' ? '…' : '>')
+        \ : &filetype
+endfunction
+
+function! airline#parts#ffenc()
+  let expected = get(g:, 'airline#parts#ffenc#skip_expected_string', '')
+  let bomb     = &l:bomb ? '[BOM]' : ''
+  let ff       = strlen(&ff) ? '['.&ff.']' : ''
+  if expected is# &fenc.bomb.ff
+    return ''
+  else
+    return &fenc.bomb.ff
+  endif
+endfunction

autoload/airline/section.vim

@@ -0,0 +1,84 @@
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+call airline#init#bootstrap()
+let s:spc = g:airline_symbols.space
+
+function! s:wrap_accent(part, value)
+  if exists('a:part.accent')
+    call airline#highlighter#add_accent(a:part.accent)
+    return '%#__accent_'.(a:part.accent).'#'.a:value.'%#__restore__#'
+  endif
+  return a:value
+endfunction
+
+function! s:create(parts, append)
+  let _ = ''
+  for idx in range(len(a:parts))
+    let part = airline#parts#get(a:parts[idx])
+    let val = ''
+    let add_sep = get(l:, 'add_sep', 0)
+
+    if exists('part.function')
+      let func = (part.function).'()'
+    elseif exists('part.text')
+      let func = '"'.(part.text).'"'
+    else
+      if a:append > 0 && idx != 0
+        let val .= s:spc.g:airline_left_alt_sep.s:spc
+      endif
+      if a:append < 0 && idx != 0
+        let t = ''
+        if !add_sep
+          let t = s:spc.g:airline_right_alt_sep.s:spc
+        endif
+        let val = t.val
+      endif
+      if exists('part.raw')
+        let _ .= s:wrap_accent(part, val.(part.raw))
+        continue
+      else
+        let _ .= s:wrap_accent(part, val.a:parts[idx])
+        continue
+      endif
+    endif
+
+    let minwidth = get(part, 'minwidth', 0)
+
+    if a:append > 0 && idx != 0
+      let partval = printf('%%{airline#util#append(%s,%s)}', func, minwidth)
+      " will add an extra separator, if minwidth is zero
+      let add_sep = (minwidth == 0)
+    elseif a:append < 0 && idx != len(a:parts) - 1
+      let partval = printf('%%{airline#util#prepend(%s,%s)}', func, minwidth)
+      " will add an extra separator, if minwidth is zero
+      let add_sep = (minwidth == 0)
+    else
+      let partval = printf('%%{airline#util#wrap(%s,%s)}', func, minwidth)
+      let add_sep = 0
+    endif
+
+    if exists('part.condition')
+      let partval = substitute(partval, '{', '\="{".(part.condition)." ? "', '')
+      let partval = substitute(partval, '}', ' : ""}', '')
+    endif
+
+    let val .= s:wrap_accent(part, partval)
+    let _ .= val
+  endfor
+  return _
+endfunction
+
+function! airline#section#create(parts)
+  return s:create(a:parts, 0)
+endfunction
+
+function! airline#section#create_left(parts)
+  return s:create(a:parts, 1)
+endfunction
+
+function! airline#section#create_right(parts)
+  return s:create(a:parts, -1)
+endfunction

autoload/airline/themes.vim

@@ -1,12 +1,151 @@
-" generates a hashtable which defines the colors for each highlight group
-function! airline#themes#generate_color_map(section1, section2, section3, file)
-  "                         guifg           guibg           ctermfg         ctermbg         gui/term
-  return {
-      \ 'mode':           [ a:section1[0] , a:section1[1] , a:section1[2] , a:section1[3] , get(a:section1, 4, 'bold') ] ,
-      \ 'mode_separator': [ a:section1[1] , a:section2[1] , a:section1[3] , a:section2[3] , ''                         ] ,
-      \ 'info':           [ a:section2[0] , a:section2[1] , a:section2[2] , a:section2[3] , get(a:section2, 4, ''    ) ] ,
-      \ 'info_separator': [ a:section2[1] , a:section3[1] , a:section2[3] , a:section3[3] , ''                         ] ,
-      \ 'statusline':     [ a:section3[0] , a:section3[1] , a:section3[2] , a:section3[3] , get(a:section3, 4, ''    ) ] ,
-      \ 'file':           [ a:file[0]     , a:file[1]     , a:file[2]     , a:file[3]     , get(a:file    , 4, ''    ) ] ,
-      \ }
-endfunction
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2 et
+
+scriptencoding utf-8
+
+if !exists(":def") || (exists(":def") && get(g:, "airline_experimental", 0)==0)
+  " generates a dictionary which defines the colors for each highlight group
+  function! airline#themes#generate_color_map(sect1, sect2, sect3, ...)
+    let palette = {
+          \ 'airline_a': [ a:sect1[0] , a:sect1[1] , a:sect1[2] , a:sect1[3] , get(a:sect1 , 4 , '') ] ,
+          \ 'airline_b': [ a:sect2[0] , a:sect2[1] , a:sect2[2] , a:sect2[3] , get(a:sect2 , 4 , '') ] ,
+          \ 'airline_c': [ a:sect3[0] , a:sect3[1] , a:sect3[2] , a:sect3[3] , get(a:sect3 , 4 , '') ] ,
+          \ }
+
+    if a:0 > 0
+      call extend(palette, {
+            \ 'airline_x': [ a:1[0] , a:1[1] , a:1[2] , a:1[3] , get(a:1 , 4 , '' ) ] ,
+            \ 'airline_y': [ a:2[0] , a:2[1] , a:2[2] , a:2[3] , get(a:2 , 4 , '' ) ] ,
+            \ 'airline_z': [ a:3[0] , a:3[1] , a:3[2] , a:3[3] , get(a:3 , 4 , '' ) ] ,
+            \ })
+    else
+      call extend(palette, {
+            \ 'airline_x': [ a:sect3[0] , a:sect3[1] , a:sect3[2] , a:sect3[3] , '' ] ,
+            \ 'airline_y': [ a:sect2[0] , a:sect2[1] , a:sect2[2] , a:sect2[3] , '' ] ,
+            \ 'airline_z': [ a:sect1[0] , a:sect1[1] , a:sect1[2] , a:sect1[3] , '' ] ,
+            \ })
+    endif
+
+    return palette
+  endfunction
+
+  function! airline#themes#get_highlight(group, ...)
+    return call('airline#highlighter#get_highlight', [a:group] + a:000)
+  endfunction
+
+  function! airline#themes#get_highlight2(fg, bg, ...)
+    return call('airline#highlighter#get_highlight2', [a:fg, a:bg] + a:000)
+  endfunction
+
+  function! airline#themes#patch(palette)
+    for mode in keys(a:palette)
+      if mode == 'accents'
+        continue
+      endif
+      if !has_key(a:palette[mode], 'airline_warning')
+        let a:palette[mode]['airline_warning'] = [ '#000000', '#df5f00', 232, 166 ]
+      endif
+      if !has_key(a:palette[mode], 'airline_error')
+        let a:palette[mode]['airline_error'] = [ '#000000', '#990000', 232, 160 ]
+      endif
+      if !has_key(a:palette[mode], 'airline_term')
+        let a:palette[mode]['airline_term'] = [ '#9cffd3', '#202020', 85, 232]
+      endif
+    endfor
+
+    let a:palette.accents = get(a:palette, 'accents', {})
+    let a:palette.accents.none = [ '', '', '', '', '' ]
+    let a:palette.accents.bold = [ '', '', '', '', 'bold' ]
+    let a:palette.accents.italic = [ '', '', '', '', 'italic' ]
+
+    if !has_key(a:palette.accents, 'red')
+      let a:palette.accents.red = [ '#ff0000' , '' , 160 , '' ]
+    endif
+    if !has_key(a:palette.accents, 'green')
+      let a:palette.accents.green = [ '#008700' , '' , 22  , '' ]
+    endif
+    if !has_key(a:palette.accents, 'blue')
+      let a:palette.accents.blue = [ '#005fff' , '' , 27  , '' ]
+    endif
+    if !has_key(a:palette.accents, 'yellow')
+      let a:palette.accents.yellow = [ '#dfff00' , '' , 190 , '' ]
+    endif
+    if !has_key(a:palette.accents, 'orange')
+      let a:palette.accents.orange = [ '#df5f00' , '' , 166 , '' ]
+    endif
+    if !has_key(a:palette.accents, 'purple')
+      let a:palette.accents.purple = [ '#af00df' , '' , 128 , '' ]
+    endif
+  endfunction
+else
+  " New Vim9script implementation
+  def airline#themes#generate_color_map(sect1: list<string>, sect2: list<any>, sect3: list<any>): dict<any>
+		# Only allows for 3 arguments currently, because Vim9 Script does not
+		# allow for a:000
+
+		# all sections should be string
+		map(sect2, {_, v -> type(v) != type('') ? string(v) : v})
+    var palette = {
+			'airline_a': [ sect1[0], sect1[1], sect1[2], sect1[3], get(sect1, 4, '') ],
+			'airline_b': [ sect2[0], sect2[1], sect2[2], sect2[3], get(sect2, 4, '') ],
+			'airline_c': [ sect3[0], sect3[1], sect3[2], sect3[3], get(sect3, 4, '') ],
+			}
+
+		extend(palette, {
+			'airline_x': [ sect3[0], sect3[1], sect3[2], sect3[3], '' ],
+			'airline_y': [ sect2[0], sect2[1], sect2[2], sect2[3], '' ],
+			'airline_z': [ sect1[0], sect1[1], sect1[2], sect1[3], '' ],
+			})
+
+    return palette
+  enddef
+
+  def airline#themes#get_highlight(group: string): list<string>
+    return call('airline#highlighter#get_highlight', [group])
+  enddef
+
+  def airline#themes#get_highlight2(fg: list<string>, bg: list<string>): list<string>
+    return call('airline#highlighter#get_highlight2', [fg, bg])
+  enddef
+
+  def airline#themes#patch(palette: dict<any>): void
+    for mode in keys(palette)
+      if mode == 'accents'
+        continue
+      endif
+      if !has_key(palette[mode], 'airline_warning')
+        extend(palette[mode], #{airline_warning: [ '#000000', '#df5f00', '232', '166', '' ]})
+      endif
+      if !has_key(palette[mode], 'airline_error')
+        extend(palette[mode], #{airline_error: [ '#000000', '#990000', '232', '160', '' ]})
+      endif
+      if !has_key(palette[mode], 'airline_term')
+        extend(palette[mode], #{airline_term: [ '#9cffd3', '#202020', '85', '232', '']})
+      endif
+    endfor
+
+    palette.accents = get(palette, 'accents', {})
+    extend(palette.accents, #{none: [ '', '', '', '', '' ]})
+    extend(palette.accents, #{bold:  [ '', '', '', '', 'bold' ]})
+    extend(palette.accents, #{italic: [ '', '', '', '', 'italic' ]})
+
+    if !has_key(palette.accents, 'red')
+      extend(palette.accents, #{red: [ '#ff0000', '', '160', '' ]})
+    endif
+    if !has_key(palette.accents, 'green')
+      extend(palette.accents, #{green: [ '#008700', '', '22', '' ]})
+    endif
+    if !has_key(palette.accents, 'blue')
+      extend(palette.accents, #{blue: [ '#005fff', '', '27', '' ]})
+    endif
+    if !has_key(palette.accents, 'yellow')
+      extend(palette.accents, #{yellow: [ '#dfff00', '', '190', '' ]})
+    endif
+    if !has_key(palette.accents, 'orange')
+      extend(palette.accents, #{orange: [ '#df5f00', '', '166', '' ]})
+    endif
+    if !has_key(palette.accents, 'purple')
+      extend(palette.accents, #{purple: [ '#af00df', '', '128', '' ]})
+    endif
+  enddef
+endif

autoload/airline/themes/badwolf.vim

@@ -1,53 +0,0 @@
-let s:N1 = [ '#141413' , '#aeee00' , 232 , 154 ] " blackestgravel & lime
-let s:N2 = [ '#f4cf86' , '#45413b' , 222 , 238 ] " dirtyblonde    & deepgravel
-let s:N3 = [ '#8cffba' , '#242321' , 121 , 235 ] " saltwatertaffy & darkgravel
-let s:N4 = [ '#666462' , 241 ]                   " mediumgravel
-
-let s:I1 = [ '#141413' , '#0a9dff' , 232 , 39  ] " blackestgravel & tardis
-let s:I2 = [ '#f4cf86' , '#005fff' , 222 , 27  ] " dirtyblonde    & facebook
-let s:I3 = [ '#0a9dff' , '#242321' , 39  , 235 ] " tardis         & darkgravel
-
-let s:V1 = [ '#141413' , '#ffa724' , 232 , 214 ] " blackestgravel & orange
-let s:V2 = [ '#000000' , '#fade3e' , 16  , 221 ] " coal           & dalespale
-let s:V3 = [ '#000000' , '#b88853' , 16  , 137 ] " coal           & toffee
-let s:V4 = [ '#c7915b' , 173 ]                   " coffee
-
-let s:PA = [ '#f4cf86' , 222 ]                   " dirtyblonde
-let s:RE = [ '#ff9eb8' , 211 ]                   " dress
-
-let s:file = [ '#ff2c4b' , s:N3[1] , 196     , s:N3[3] , '' ]
-let s:IA   = [ s:N2[1]   , s:N3[1] , s:N2[3] , s:N3[3] , '' ]
-
-
-let g:airline#themes#badwolf#normal = airline#themes#generate_color_map(s:N1, s:N2, s:N3, s:file)
-let g:airline#themes#badwolf#normal_modified = {
-      \ 'mode_separator' : [ s:N1[1]   , s:N4[0]   , s:N1[3]   , s:N4[1]   , 'bold' ] ,
-      \ 'info'           : [ s:N2[0]   , s:N4[0]   , s:N2[2]   , s:N4[1]   , ''     ] ,
-      \ 'info_separator' : [ s:N4[0]   , s:N2[1]   , s:N4[1]   , s:N2[3]   , 'bold' ] ,
-      \ 'statusline'     : [ s:V1[1]   , s:N2[1]   , s:V1[3]   , s:N2[3]   , ''     ] }
-
-
-let g:airline#themes#badwolf#insert = airline#themes#generate_color_map(s:I1, s:I2, s:I3, s:file)
-let g:airline#themes#badwolf#insert_modified = {
-      \ 'info_separator' : [ s:I2[1]   , s:N2[1]   , s:I2[3]   , s:N2[3]   , 'bold' ] ,
-      \ 'statusline'     : [ s:V1[1]   , s:N2[1]   , s:V1[3]   , s:N2[3]   , ''     ] }
-let g:airline#themes#badwolf#insert_paste = {
-      \ 'mode'           : [ s:I1[0]   , s:PA[0]   , s:I1[2]   , s:PA[1]   , ''     ] ,
-      \ 'mode_separator' : [ s:PA[0]   , s:I2[1]   , s:PA[1]   , s:I2[3]   , ''     ] }
-
-
-let g:airline#themes#badwolf#replace = copy(airline#themes#badwolf#insert)
-let g:airline#themes#badwolf#replace.mode           = [ s:I1[0] , s:RE[0] , s:I1[2] , s:RE[1] , '' ]
-let g:airline#themes#badwolf#replace.mode_separator = [ s:RE[0] , s:I2[1] , s:RE[1] , s:I2[3] , '' ]
-let g:airline#themes#badwolf#replace_modified = g:airline#themes#badwolf#insert_modified
-
-
-let g:airline#themes#badwolf#visual = airline#themes#generate_color_map(s:V1, s:V2, s:V3, s:file)
-let g:airline#themes#badwolf#visual_modified = {
-      \ 'info_separator' : [ s:V2[1]   , s:V4[0]   , s:V2[3]   , s:V4[1]   , 'bold' ] ,
-      \ 'statusline'     : [ s:V3[0]   , s:V4[0]   , s:V3[2]   , s:V4[1]   , ''     ] }
-
-
-let g:airline#themes#badwolf#inactive = airline#themes#generate_color_map(s:IA, s:IA, s:IA, s:file)
-let g:airline#themes#badwolf#inactive_modified = {
-      \ 'statusline'     : [ s:V1[1]   , ''        , s:V1[3]   , ''        , ''     ] }

autoload/airline/themes/dark.vim

@@ -1,47 +1,163 @@
-let s:file = [ '#ff0000' , '#1c1c1c' , 160 , 233 , '' ]
-let s:N1 = [ '#00005f' , '#dfff00' , 17  , 190 ]
-let s:N2 = [ '#ffffff' , '#444444' , 255 , 238 ]
-let s:N3 = [ '#9cffd3' , '#202020' , 85  , 234 ]
-let g:airline#themes#dark#normal = airline#themes#generate_color_map(s:N1, s:N2, s:N3, s:file)
-let g:airline#themes#dark#normal_modified = {
-      \ 'info_separator': [ '#444444' , '#5f005f' , 238     , 53      , ''     ] ,
-      \ 'statusline':     [ '#ffffff' , '#5f005f' , 255     , 53      , ''     ] ,
+" MIT License. Copyright (c) 2013-2020 Bailey Ling et al.
+" vim: et ts=2 sts=2 sw=2 tw=80
+
+scriptencoding utf-8
+
+" Airline themes are generated based on the following concepts:
+"   * The section of the status line, valid Airline statusline sections are:
+"       * airline_a (left most section)
+"       * airline_b (section just to the right of airline_a)
+"       * airline_c (section just to the right of airline_b)
+"       * airline_x (first section of the right most sections)
+"       * airline_y (section just to the right of airline_x)
+"       * airline_z (right most section)
+"   * The mode of the buffer, as reported by the :mode() function.  Airline 
+"     converts the values reported by mode() to the following:
+"       * normal
+"       * insert
+"       * replace
+"       * visual
+"       * inactive
+"       * terminal
+"       The last one is actually no real mode as returned by mode(), but used by
+"       airline to style inactive statuslines (e.g. windows, where the cursor
+"       currently does not reside in).
+"   * In addition to each section and mode specified above, airline themes 
+"     can also specify overrides.  Overrides can be provided for the following
+"     scenarios:
+"       * 'modified'
+"       * 'paste'
+"
+" Airline themes are specified as a global viml dictionary using the above
+" sections, modes and overrides as keys to the dictionary.  The name of the
+" dictionary is significant and should be specified as:
+"   * g:airline#themes#<theme_name>#palette
+" where <theme_name> is substituted for the name of the theme.vim file where the
+" theme definition resides.  Airline themes should reside somewhere on the
+" 'runtimepath' where it will be loaded at vim startup, for example:  
+"   * autoload/airline/themes/theme_name.vim
+"
+" For this, the dark.vim, theme, this is defined as
+let g:airline#themes#dark#palette = {}
+
+" Keys in the dictionary are composed of the mode, and if specified the
+" override.  For example:
+"   * g:airline#themes#dark#palette.normal 
+"       * the colors for a statusline while in normal mode
+"   * g:airline#themes#dark#palette.normal_modified 
+"       * the colors for a statusline while in normal mode when the buffer has
+"         been modified
+"   * g:airline#themes#dark#palette.visual 
+"       * the colors for a statusline while in visual mode
+"
+" Values for each dictionary key is an array of color values that should be
+" familiar for colorscheme designers:
+"   * [guifg, guibg, ctermfg, ctermbg, opts]
+" See "help attr-list" for valid values for the "opt" value.
+"
+" Each theme must provide an array of such values for each airline section of
+" the statusline (airline_a through airline_z).  A convenience function, 
+" airline#themes#generate_color_map() exists to mirror airline_a/b/c to
+" airline_x/y/z, respectively.
+
+" The dark.vim theme:
+let s:airline_a_normal   = [ '#00005f' , '#dfff00' , '17'  , '190' ]
+let s:airline_b_normal   = [ '#ffffff' , '#444444' , '255' , '238' ]
+let s:airline_c_normal   = [ '#9cffd3' , '#202020' , '85'  , '234' ]
+let g:airline#themes#dark#palette.normal = airline#themes#generate_color_map(s:airline_a_normal, s:airline_b_normal, s:airline_c_normal)
+
+" It should be noted the above is equivalent to:
+" let g:airline#themes#dark#palette.normal = airline#themes#generate_color_map(
+"    \  [ '#00005f' , '#dfff00' , 17  , 190 ],  " section airline_a
+"    \  [ '#ffffff' , '#444444' , 255 , 238 ],  " section airline_b
+"    \  [ '#9cffd3' , '#202020' , 85  , 234 ]   " section airline_c
+"    \)
+"
+" In turn, that is equivalent to:
+" let g:airline#themes#dark#palette.normal = {
+"    \  'airline_a': [ '#00005f' , '#dfff00' , 17  , 190 ],  "section airline_a
+"    \  'airline_b': [ '#ffffff' , '#444444' , 255 , 238 ],  "section airline_b
+"    \  'airline_c': [ '#9cffd3' , '#202020' , 85  , 234 ],  "section airline_c
+"    \  'airline_x': [ '#9cffd3' , '#202020' , 85  , 234 ],  "section airline_x
+"    \  'airline_y': [ '#ffffff' , '#444444' , 255 , 238 ],  "section airline_y
+"    \  'airline_z': [ '#00005f' , '#dfff00' , 17  , 190 ]   "section airline_z
+"    \}
+"
+" airline#themes#generate_color_map() also uses the values provided as
+" parameters to create intermediary groups such as:
+"   airline_a_to_airline_b
+"   airline_b_to_airline_c
+"   etc...
+
+" Here we define overrides for when the buffer is modified.  This will be
+" applied after g:airline#themes#dark#palette.normal, hence why only certain keys are
+" declared.
+let g:airline#themes#dark#palette.normal_modified = {
+      \ 'airline_c': [ '#ffffff' , '#5f005f' , '255'     , '53'      , ''     ] ,
       \ }
 
 
-let s:I1 = [ '#00005f' , '#00dfff' , 17  , 45  ]
-let s:I2 = [ '#ffffff' , '#005fff' , 255 , 27  ]
-let s:I3 = [ '#ffffff' , '#000080' , 15  , 17  ]
-let g:airline#themes#dark#insert = airline#themes#generate_color_map(s:I1, s:I2, s:I3, s:file)
-let g:airline#themes#dark#insert_modified = {
-      \ 'info_separator': [ '#005fff' , '#5f005f' , 27      , 53      , ''     ] ,
-      \ 'statusline':     [ '#ffffff' , '#5f005f' , 255     , 53      , ''     ] ,
+let s:airline_a_insert = [ '#00005f' , '#00dfff' , '17'  , '45'  ]
+let s:airline_b_insert = [ '#ffffff' , '#005fff' , '255' , '27'  ]
+let s:airline_c_insert = [ '#ffffff' , '#000080' , '15'  , '17'  ]
+let g:airline#themes#dark#palette.insert = airline#themes#generate_color_map(s:airline_a_insert, s:airline_b_insert, s:airline_c_insert)
+let g:airline#themes#dark#palette.insert_modified = {
+      \ 'airline_c': [ '#ffffff' , '#5f005f' , '255'     , '53'      , ''     ] ,
       \ }
-let g:airline#themes#dark#insert_paste = {
-      \ 'mode':           [ s:I1[0]   , '#d78700' , s:I1[2] , 172     , ''     ] ,
-      \ 'mode_separator': [ '#d78700' , s:I2[1]   , 172     , s:I2[3] , ''     ] ,
+let g:airline#themes#dark#palette.insert_paste = {
+      \ 'airline_a': [ s:airline_a_insert[0]   , '#d78700' , s:airline_a_insert[2] , '172'     , ''     ] ,
+      \ }
+
+let g:airline#themes#dark#palette.terminal = airline#themes#generate_color_map(s:airline_a_insert, s:airline_b_insert, s:airline_c_insert)
+
+let g:airline#themes#dark#palette.replace = copy(g:airline#themes#dark#palette.insert)
+let g:airline#themes#dark#palette.replace.airline_a = [ s:airline_b_insert[0]   , '#af0000' , s:airline_b_insert[2] , '124'     , ''     ]
+let g:airline#themes#dark#palette.replace_modified = g:airline#themes#dark#palette.insert_modified
+
+
+let s:airline_a_visual = [ '#000000' , '#ffaf00' , '232' , '214' ]
+let s:airline_b_visual = [ '#000000' , '#ff5f00' , '232' , '202' ]
+let s:airline_c_visual = [ '#ffffff' , '#5f0000' , '15'  , '52'  ]
+let g:airline#themes#dark#palette.visual = airline#themes#generate_color_map(s:airline_a_visual, s:airline_b_visual, s:airline_c_visual)
+let g:airline#themes#dark#palette.visual_modified = {
+      \ 'airline_c': [ '#ffffff' , '#5f005f' , '255'     , '53'      , ''     ] ,
       \ }
 
 
-let g:airline#themes#dark#replace = copy(g:airline#themes#dark#insert)
-let g:airline#themes#dark#replace.mode           = [ s:I2[0]   , '#af0000' , s:I2[2] , 124     , ''     ]
-let g:airline#themes#dark#replace.mode_separator = [ '#af0000' , s:I2[1]   , 124     , s:I2[3] , ''     ]
-let g:airline#themes#dark#replace_modified = g:airline#themes#dark#insert_modified
+let s:airline_a_inactive = [ '#4e4e4e' , '#1c1c1c' , '239' , '234' , '' ]
+let s:airline_b_inactive = [ '#4e4e4e' , '#262626' , '239' , '235' , '' ]
+let s:airline_c_inactive = [ '#4e4e4e' , '#303030' , '239' , '236' , '' ]
+let g:airline#themes#dark#palette.inactive = airline#themes#generate_color_map(s:airline_a_inactive, s:airline_b_inactive, s:airline_c_inactive)
+let g:airline#themes#dark#palette.inactive_modified = {
+      \ 'airline_c': [ '#875faf' , '' , '97' , '' , '' ] ,
+      \ }
 
+" For commandline mode, we use the colors from normal mode, except the mode
+" indicator should be colored differently, e.g. light green
+let s:airline_a_commandline = [ '#0000ff' , '#0cff00' , '17'  , '40' ]
+let s:airline_b_commandline = [ '#ffffff' , '#444444' , '255' , '238' ]
+let s:airline_c_commandline = [ '#9cffd3' , '#202020' , '85'  , '234' ]
+let g:airline#themes#dark#palette.commandline = airline#themes#generate_color_map(s:airline_a_commandline, s:airline_b_commandline, s:airline_c_commandline)
 
-let s:V1 = [ '#000000' , '#ffaf00' , 232 , 214 ]
-let s:V2 = [ '#000000' , '#ff5f00' , 232 , 202 ]
-let s:V3 = [ '#ffffff' , '#5f0000' , 15  , 52  ]
-let g:airline#themes#dark#visual = airline#themes#generate_color_map(s:V1, s:V2, s:V3, s:file)
-let g:airline#themes#dark#visual_modified = {
-      \ 'info_separator': [ '#ff5f00' , '#5f005f' , 202     , 53      , ''     ] ,
-      \ 'statusline':     [ '#ffffff' , '#5f005f' , 255     , 53      , ''     ] ,
+" Accents are used to give parts within a section a slightly different look or
+" color. Here we are defining a "red" accent, which is used by the 'readonly'
+" part by default. Only the foreground colors are specified, so the background
+" colors are automatically extracted from the underlying section colors. What
+" this means is that regardless of which section the part is defined in, it
+" will be red instead of the section's foreground color. You can also have
+" multiple parts with accents within a section.
+let g:airline#themes#dark#palette.accents = {
+      \ 'red': [ '#ff0000' , '' , '160' , ''  ]
       \ }
 
 
-let s:IA = [ '#4e4e4e' , '#1c1c1c' , 239 , 234 , '' ]
-let g:airline#themes#dark#inactive = airline#themes#generate_color_map(s:IA, s:IA, s:IA, s:file)
-let g:airline#themes#dark#inactive_modified = {
-      \ 'statusline': [ '#5f005f' , '' , '53' , '' , '' ] ,
-      \ }
-
+" Here we define the color map for ctrlp.  We check for the g:loaded_ctrlp
+" variable so that related functionality is loaded if the user is using
+" ctrlp. Note that this is optional, and if you do not define ctrlp colors
+" they will be chosen automatically from the existing palette.
+if get(g:, 'loaded_ctrlp', 0)
+  let g:airline#themes#dark#palette.ctrlp = airline#extensions#ctrlp#generate_color_map(
+        \ [ '#d7d7ff' , '#5f00af' , '189' , '55'  , ''     ],
+        \ [ '#ffffff' , '#875fd7' , '231' , '98'  , ''     ],
+        \ [ '#5f00af' , '#ffffff' , '55'  , '231' , 'bold' ])
+endif

autoload/airline/themes/laederon.vim

@@ -1,62 +0,0 @@
-" vim-airline companion theme of Laederon 
-" (https://github.com/Donearm/Laederon)
-
-" Normal mode
-let s:N1 = [ '#1a1a18' , '#ffffff' , 232 , 255 ] " blackestgravel & snow
-let s:N2 = [ '#ffffff' , '#44403a' , 255, 238 ] " snow & deepgravel
-let s:N3 = [ '#90a680' , '#2e2d2a' , 64, 235 ] " dilutedpaint & darkgravel
-let s:N4 = [ '#777470' , 240 ] " gravel
-
-" Insert mode
-let s:I1 = [ '#1a1a18' , '#1693a5' , 232 , 62 ] " blackestgravel & crystallake 
-let s:I2 = [ '#515744' , '#44403a' , 101 , 238 ] " lichen & deepgravel
-let s:I3 = [ '#1693a5' , '#2e2d2a' , 39 , 235 ] " crystallake & darkgravel
-
-" Visual mode
-let s:V1 = [ '#1a1a18' , '#ab3e5d' , 232 , 161 ] " blackestgravel & raspberry
-let s:V2 = [ '#000000' , '#908571' , 16 , 252 ] " coal & winterterrain
-let s:V3 = [ '#ab3e5d' , '#8c7f77' , 161 , 245 ] " raspberry & wetcoldterrain
-let s:V4 = [ '#515744' , 101 ] " lichen
-
-" Replace mode
-let s:RE = [ '#233e09' , 22 ] " oakleaf
-
-" Paste mode
-let s:PA = [ '#ab3e5d' , 161 ] " raspberry
-
-let s:file = [ '#ef393d' , s:N3[1] , 196 , s:N3[3] , '' ]
-let s:IA = [ s:N2[1]	, s:N3[1]	, s:N2[3],	s:N3[3]	, '' ]	
-
-
-let g:airline#themes#laederon#normal = airline#themes#generate_color_map(s:N1, s:N2, s:N3, s:file)
-let g:airline#themes#laederon#normal_modified = {
-      \ 'mode_separator' : [ s:N1[1] , s:N4[0] , s:N1[3] , s:N4[1] , 'bold' ] ,
-      \ 'info' : [ s:N2[0] , s:N4[0] , s:N2[2] , s:N4[1] , '' ] ,
-      \ 'info_separator' : [ s:N4[0] , s:N2[1] , s:N4[1] , s:N2[3] , 'bold' ] ,
-      \ 'statusline' : [ s:V1[1] , s:N2[1] , s:V1[3] , s:N2[3] , '' ] }
-
-
-let g:airline#themes#laederon#insert = airline#themes#generate_color_map(s:I1, s:I2, s:I3, s:file)
-let g:airline#themes#laederon#insert_modified = {
-      \ 'info_separator' : [ s:I2[1] , s:N2[1] , s:I2[3] , s:N2[3] , 'bold' ] ,
-      \ 'statusline' : [ s:V2[1] , s:N2[1] , s:V2[3] , s:N2[3] , '' ] }
-let g:airline#themes#laederon#insert_paste = {
-      \ 'mode' : [ s:I1[0] , s:PA[0] , s:I1[2] , s:PA[1] , '' ] ,
-      \ 'mode_separator' : [ s:PA[0] , s:I2[1] , s:PA[1] , s:I2[3] , '' ] }
-
-
-let g:airline#themes#laederon#replace = copy(airline#themes#laederon#insert)
-let g:airline#themes#laederon#replace.mode = [ s:I1[0] , s:RE[0] , s:I1[2] , s:RE[1] , '' ]
-let g:airline#themes#laederon#replace.mode_separator = [ s:RE[0] , s:I2[1] , s:RE[1] , s:V4[1] , '' ]
-let g:airline#themes#laederon#replace_modified = g:airline#themes#laederon#insert_modified
-
-
-let g:airline#themes#laederon#visual = airline#themes#generate_color_map(s:V1, s:V2, s:V3, s:file)
-let g:airline#themes#laederon#visual_modified = {
-      \ 'info_separator' : [ s:V2[1] , s:V4[0] , s:V2[3] , s:V4[1] , 'bold' ] ,
-      \ 'statusline' : [ s:V3[0] , s:V4[0] , s:V3[2] , s:V4[1] , '' ] }
-
-
-let g:airline#themes#laederon#inactive = airline#themes#generate_color_map(s:IA, s:IA, s:IA, s:file)
-let g:airline#themes#laederon#inactive_modified = {
-      \ 'statusline' : [ s:V1[1] , '', s:V1[3] , '', '' ] }