Merge pull request #47 from junegunn/fix-upgrade

Do not require reloading of .vimrc after PlugUpgrade

.travis.yml

@@ -1,4 +1,7 @@
-language: vim
+language: ruby
+rvm:
+  - 1.8.7
+  - 2.0.0
 
 before_script: |
   hg clone https://code.google.com/p/vim/

README.md

@@ -1,26 +1,22 @@
 ![vim-plug](https://raw.github.com/junegunn/vim-plug/master/plug.png)
 ![travis-ci](https://travis-ci.org/junegunn/vim-plug.svg?branch=master)
 
-A single-file Vim plugin manager.
-
-Somewhere between [Pathogen](https://github.com/tpope/vim-pathogen) and
-[Vundle](https://github.com/gmarik/vundle), but with faster parallel installer.
+A minimalist Vim plugin manager.
 
 ![](https://raw.github.com/junegunn/i/master/vim-plug/installer.gif)
 
 ### Pros.
 
-- Easier to setup
-- Parallel installation/update (requires
-  [+ruby](http://junegunn.kr/2013/09/installing-vim-with-ruby-support/))
-- Smallest possible feature set
-- Branch/tag support
-- On-demand loading
-- Dependency resolution using `Plugfile` (experimental)
-
-### Cons.
-
-- Everything else
+- Easier to setup: Single file. No boilerplate code required.
+- Easier to use: Concise, intuitive syntax
+- [Super-fast](https://raw.github.com/junegunn/i/master/vim-plug/40-in-4.gif)
+  parallel installation/update (requires
+  [+ruby](https://github.com/junegunn/vim-plug/wiki/ruby))
+- On-demand loading to achieve
+  [fast startup time](http://junegunn.kr/images/vim-startup-time.png)
+- Post-update hooks
+- Can choose a specific branch or tag for each plugin
+- Support for externally managed plugins
 
 ### Usage
 
@@ -29,7 +25,8 @@ and put it in ~/.vim/autoload
 
 ```sh
 mkdir -p ~/.vim/autoload
-curl -fLo ~/.vim/autoload/plug.vim https://raw.github.com/junegunn/vim-plug/master/plug.vim
+curl -fLo ~/.vim/autoload/plug.vim \
+    https://raw.github.com/junegunn/vim-plug/master/plug.vim
 ```
 
 Edit your .vimrc
@@ -51,8 +48,11 @@ Plug 'https://github.com/junegunn/vim-github-dashboard.git'
 " Plugin options
 Plug 'nsf/gocode', { 'tag': 'go.weekly.2012-03-13', 'rtp': 'vim' }
 
-" Locally-managed plugin
-Plug '~/.fzf'
+" Plugin outside ~/.vim/plugged with post-update hook
+Plug 'junegunn/fzf', { 'dir': '~/.fzf', 'do': 'yes \| ./install' }
+
+" Unmanaged plugin (manually installed and updated)
+Plug '~/my-prototype-plugin'
 
 call plug#end()
 ```
@@ -61,14 +61,14 @@ Reload .vimrc and `:PlugInstall` to install plugins.
 
 ### Commands
 
-| Command                           | Description                                                        |
-| --------------------------------- | ------------------------------------------------------------------ |
-| PlugInstall [name ...] [#threads] | Install plugins                                                    |
-| PlugUpdate [name ...] [#threads]  | Install or update plugins                                          |
-| PlugClean[!]                      | Remove unused directories (bang version will clean without prompt) |
-| PlugUpgrade                       | Upgrade vim-plug itself                                            |
-| PlugStatus                        | Check the status of plugins                                        |
-| PlugDiff                          | See the updated changes from the previous PlugUpdate               |
+| Command                             | Description                                                        |
+| ----------------------------------- | ------------------------------------------------------------------ |
+| `PlugInstall [name ...] [#threads]` | Install plugins                                                    |
+| `PlugUpdate [name ...] [#threads]`  | Install or update plugins                                          |
+| `PlugClean[!]`                      | Remove unused directories (bang version will clean without prompt) |
+| `PlugUpgrade`                       | Upgrade vim-plug itself                                            |
+| `PlugStatus`                        | Check the status of plugins                                        |
+| `PlugDiff`                          | See the updated changes from the previous PlugUpdate               |
 
 ### `Plug` options
 
@@ -76,7 +76,9 @@ Reload .vimrc and `:PlugInstall` to install plugins.
 | -------------- | -------------------------------------------------------------------- |
 | `branch`/`tag` | Branch or tag of the repository to use                               |
 | `rtp`          | Subdirectory that contains Vim plugin                                |
-| `on`           | On-demand loading: Commands or <Plug>-mappings                       |
+| `dir`          | Custom directory for the plugin                                      |
+| `do`           | Post-update hook (string or funcref)                                 |
+| `on`           | On-demand loading: Commands or `<Plug>`-mappings                     |
 | `for`          | On-demand loading: File types                                        |
 | `frozen`       | Do not install/update plugin unless explicitly given as the argument |
 
@@ -119,71 +121,63 @@ Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
 Plug 'junegunn/vader.vim',  { 'on': 'Vader', 'for': 'vader' }
 ```
 
-### Dependency resolution
+### Post-update hooks
 
-See [Dependency
-Resolution](https://github.com/junegunn/vim-plug/wiki/Dependency-Resolution).
+There are some plugins that require extra steps after installation or update.
+In that case, use `do` option to describe the task to be performed.
+
+```vim
+Plug 'Valloric/YouCompleteMe', { 'do': './install.sh' }
+```
+
+If you need more control, you can pass a reference to a Vim function that
+takes a single argument.
+
+```vim
+function! BuildYCM(info)
+  " info is a dictionary with 3 fields
+  " - name:   name of the plugin
+  " - status: 'installed', 'updated', or 'unchanged'
+  " - force:  set on PlugInstall! or PlugUpdate!
+  if a:info.status == 'installed' || a:info.force
+    !./install.sh
+  endif
+endfunction
+
+Plug 'Valloric/YouCompleteMe', { 'do': function('BuildYCM') }
+```
+
+Both forms of post-update hook are executed inside the directory of the plugin
+and only run when the repository has changed, but you can force it to run
+unconditionally with the bang-versions of the commands: `PlugInstall!` and
+`PlugUpdate!`.
+
+Make sure to escape BARs and double-quotes when you write `do` option inline
+as they are mistakenly recognized as command separator or the start of the
+trailing comment.
+
+```vim
+Plug 'junegunn/fzf', { 'do': 'yes \| ./install' }
+```
+
+But you can avoid the escaping if you extract the inline specification using a
+variable (or any Vimscript expression) as follows:
+
+```vim
+let g:fzf_install = 'yes | ./install'
+Plug 'junegunn/fzf', { 'do': g:fzf_install }
+```
+
+### FAQ/Troubleshooting
+
+See [FAQ/Troubleshooting](https://github.com/junegunn/vim-plug/wiki/faq).
 
 ### Articles
 
 - [Writing my own Vim plugin manager](http://junegunn.kr/2013/09/writing-my-own-vim-plugin-manager)
-- [Thoughts on Vim plugin dependency](http://junegunn.kr/2013/09/thoughts-on-vim-plugin-dependency)
-
-### FAQ/Troubleshooting
-
-#### Plugins are not installed/updated in parallel
-
-Your Vim does not support Ruby interface. `:echo has('ruby')` should print 1.
-In order to setup Vim with Ruby support, you may refer to [this
-article](http://junegunn.kr/2013/09/installing-vim-with-ruby-support).
-
-#### *Vim: Caught deadly signal SEGV*
-
-If your Vim crashes with the above message, first check if its Ruby interface is
-working correctly with the following command:
-
-```vim
-:ruby puts RUBY_VERSION
-```
-
-If Vim crashes even with this command, it is likely that Ruby interface is
-broken, and you have to rebuild Vim with a working version of Ruby.
-(`brew remove vim && brew install vim` or `./configure && make ...`)
-
-If you're on OS X, one possibility is that you had installed Vim with
-[Homebrew](http://brew.sh/) while using a Ruby installed with
-[RVM](http://rvm.io/) or [rbenv](https://github.com/sstephenson/rbenv) and later
-removed that version of Ruby.
-
-[Please let me know](https://github.com/junegunn/vim-plug/issues) if you can't
-resolve the problem. In the meantime, you can set `g:plug_threads` to 1, so that
-Ruby installer is not used at all.
-
-#### Errors on fish shell
-
-If vim-plug doesn't work correctly on fish shell, you might need to add `set
-shell=/bin/sh` to your .vimrc.
-
-Refer to the following links for the details:
-- http://badsimplicity.com/vim-fish-e484-cant-open-file-tmpvrdnvqe0-error/
-- https://github.com/junegunn/vim-plug/issues/12
-
-#### Freezing plugin version with commit hash
-
-vim-plug does not allow you to freeze the version of a plugin with its commit
-hash. This is by design. I don't believe a user of a plugin should be looking
-at its individual commits. Instead, one should be choosing the right version
-using release tags or versioned branches (e.g. 1.2.3, stable, devel, etc.)
-
-```vim
-Plug 'junegunn/vim-easy-align', '2.9.2'
-```
-
-If the repository doesn't come with such tags or branches, you should think of
-it as "unstable" or "in development", and always use its latest revision.
-
-If you really must choose a certain untagged revision, consider forking the
-repository.
+- [Vim plugins and startup time](http://junegunn.kr/2014/07/vim-plugins-and-startup-time)
+- ~~[Thoughts on Vim plugin dependency](http://junegunn.kr/2013/09/thoughts-on-vim-plugin-dependency)~~
+    - *Support for Plugfile has been removed since 0.5.0*
 
 ### License
 

plug.vim

@@ -9,19 +9,32 @@
 "
 " Edit your .vimrc
 "
-"   call plug#begin()
+"   call plug#begin('~/.vim/plugged')
 "
+"   " Make sure you use single quotes
 "   Plug 'junegunn/seoul256.vim'
 "   Plug 'junegunn/vim-easy-align'
-"   Plug 'junegunn/goyo.vim', { 'on': 'Goyo' }
-"   " Plug 'user/repo1', 'branch_or_tag'
-"   " Plug 'user/repo2', { 'rtp': 'vim/plugin/dir', 'branch': 'branch_or_tag' }
-"   " ...
+"
+"   " On-demand loading
+"   Plug 'scrooloose/nerdtree', { 'on':  'NERDTreeToggle' }
+"   Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
+"
+"   " Using git URL
+"   Plug 'https://github.com/junegunn/vim-github-dashboard.git'
+"
+"   " Plugin options
+"   Plug 'nsf/gocode', { 'tag': 'go.weekly.2012-03-13', 'rtp': 'vim' }
+"
+"   " Plugin outside ~/.vim/plugged with post-update hook
+"   Plug 'junegunn/fzf', { 'dir': '~/.fzf', 'do': 'yes \| ./install' }
+"
+"   " Unmanaged plugin (manually installed and updated)
+"   Plug '~/my-prototype-plugin'
 "
 "   call plug#end()
 "
-" Then :PlugInstall to install plugins. (default: ~/.vim/plugged)
-" You can change the location of the plugins with plug#begin(path) call.
+" Then reload .vimrc and :PlugInstall to install plugins.
+" Visit https://github.com/junegunn/vim-plug for more information.
 "
 "
 " Copyright (c) 2014 Junegunn Choi
@@ -56,11 +69,17 @@ let s:cpo_save = &cpo
 set cpo&vim
 
 let s:plug_source = 'https://raw.github.com/junegunn/vim-plug/master/plug.vim'
-let s:plug_file = 'Plugfile'
 let s:plug_buf = -1
 let s:mac_gui = has('gui_macvim') && has('gui_running')
 let s:is_win = has('win32') || has('win64')
 let s:me = expand('<sfile>:p')
+let s:base_spec = { 'branch': 'master', 'frozen': 0 }
+let s:TYPE = {
+\   'string':  type(''),
+\   'list':    type([]),
+\   'dict':    type({}),
+\   'funcref': type(function('call'))
+\ }
 
 function! plug#begin(...)
   if a:0 > 0
@@ -70,21 +89,11 @@ function! plug#begin(...)
   elseif !empty(&rtp)
     let home = s:path(split(&rtp, ',')[0]) . '/plugged'
   else
-    echoerr "Unable to determine plug home. Try calling plug#begin() with a path argument."
-    return 0
+    return s:err('Unable to determine plug home. Try calling plug#begin() with a path argument.')
   endif
 
-  if !isdirectory(home)
-    try
-      call mkdir(home, 'p')
-    catch
-      echoerr 'Invalid plug directory: '. home
-      return 0
-    endtry
-  endif
   if !executable('git')
-    echoerr "`git' executable not found. vim-plug requires git."
-    return 0
+    return s:err('`git` executable not found. vim-plug requires git.')
   endif
 
   let g:plug_home = home
@@ -92,30 +101,37 @@ function! plug#begin(...)
   " we want to keep track of the order plugins where registered.
   let g:plugs_order = []
 
-  command! -nargs=+ -bar Plug   call s:add(1, <args>)
-  command! -nargs=* -complete=customlist,s:names PlugInstall call s:install(<f-args>)
-  command! -nargs=* -complete=customlist,s:names PlugUpdate  call s:update(<f-args>)
-  command! -nargs=0 -bang PlugClean call s:clean('<bang>' == '!')
-  command! -nargs=0 PlugUpgrade if s:upgrade() | execute "source ". s:me | endif
-  command! -nargs=0 PlugStatus  call s:status()
-  command! -nargs=0 PlugDiff    call s:diff()
-
+  call s:define_commands()
   return 1
 endfunction
 
+function! s:define_commands()
+  command! -nargs=+ -bar Plug   call s:add(<args>)
+  command! -nargs=* -bar -bang -complete=customlist,s:names PlugInstall call s:install('<bang>' == '!', <f-args>)
+  command! -nargs=* -bar -bang -complete=customlist,s:names PlugUpdate  call s:update('<bang>' == '!', <f-args>)
+  command! -nargs=0 -bar -bang PlugClean call s:clean('<bang>' == '!')
+  command! -nargs=0 -bar PlugUpgrade if s:upgrade() | execute 'source '. s:me | endif
+  command! -nargs=0 -bar PlugStatus  call s:status()
+  command! -nargs=0 -bar PlugDiff    call s:diff()
+endfunction
+
 function! s:to_a(v)
-  return type(a:v) == 3 ? a:v : [a:v]
+  return type(a:v) == s:TYPE.list ? a:v : [a:v]
+endfunction
+
+function! s:source(from, ...)
+  for pattern in a:000
+    for vim in split(globpath(a:from, pattern), '\n')
+      execute 'source '.vim
+    endfor
+  endfor
 endfunction
 
 function! plug#end()
+  let reload = !has('vim_starting')
   if !exists('g:plugs')
-    echoerr 'Call plug#begin() first'
-    return
+    return s:err('Call plug#begin() first')
   endif
-  let keys = keys(g:plugs)
-  while !empty(keys)
-    let keys = keys(s:extend(keys))
-  endwhile
 
   if exists('#PlugLOD')
     augroup PlugLOD
@@ -133,34 +149,35 @@ function! plug#end()
   for name in reverse(copy(g:plugs_order))
     let plug = g:plugs[name]
     if !has_key(plug, 'on') && !has_key(plug, 'for')
-      call s:add_rtp(s:rtp(plug))
+      let rtp = s:rtp(plug)
+      call s:add_rtp(rtp)
+      if reload
+        call s:source(rtp, 'plugin/**/*.vim', 'after/plugin/**/*.vim')
+      endif
       continue
     endif
 
     if has_key(plug, 'on')
-      let commands = s:to_a(plug.on)
-      for cmd in commands
+      for cmd in s:to_a(plug.on)
         if cmd =~ '^<Plug>.\+'
           if empty(mapcheck(cmd)) && empty(mapcheck(cmd, 'i'))
             for [mode, map_prefix, key_prefix] in
-                  \ [['i', "<C-O>", ''], ['n', '', ''], ['v', '', 'gv'], ['o', '', '']]
+                  \ [['i', '<C-O>', ''], ['n', '', ''], ['v', '', 'gv'], ['o', '', '']]
               execute printf(
-              \ "%snoremap <silent> %s %s:<C-U>call <SID>lod_map(%s, %s, '%s')<CR>",
+              \ '%snoremap <silent> %s %s:<C-U>call <SID>lod_map(%s, %s, "%s")<CR>',
               \ mode, cmd, map_prefix, string(cmd), string(name), key_prefix)
             endfor
           endif
         elseif !exists(':'.cmd)
           execute printf(
-          \ "command! -nargs=* -range -bang %s call s:lod_cmd(%s, '<bang>', <line1>, <line2>, <q-args>, %s)",
+          \ 'command! -nargs=* -range -bang %s call s:lod_cmd(%s, "<bang>", <line1>, <line2>, <q-args>, %s)',
           \ cmd, string(cmd), string(name))
         endif
       endfor
     endif
 
     if has_key(plug, 'for')
-      for vim in split(globpath(s:rtp(plug), 'ftdetect/**/*.vim'), '\n')
-        execute 'source '.vim
-      endfor
+      call s:source(s:rtp(plug), 'ftdetect/**/*.vim', 'after/ftdetect/**/*.vim')
       for key in s:to_a(plug.for)
         if !has_key(lod, key)
           let lod[key] = []
@@ -181,42 +198,60 @@ function! plug#end()
   syntax on
 endfunction
 
+function! s:trim(str)
+  return substitute(a:str, '[\/]\+$', '', '')
+endfunction
+
 if s:is_win
   function! s:rtp(spec)
-    let rtp = s:dirpath(a:spec.dir . get(a:spec, 'rtp', ''))
-    return substitute(rtp, '\\*$', '', '')
+    return s:path(a:spec.dir . get(a:spec, 'rtp', ''))
   endfunction
 
   function! s:path(path)
-    return substitute(substitute(a:path, '/', '\', 'g'), '[/\\]*$', '', '')
+    return s:trim(substitute(a:path, '/', '\', 'g'))
   endfunction
 
   function! s:dirpath(path)
     return s:path(a:path) . '\'
   endfunction
+
+  function! s:is_local_plug(repo)
+    return a:repo =~? '^[a-z]:'
+  endfunction
 else
   function! s:rtp(spec)
     return s:dirpath(a:spec.dir . get(a:spec, 'rtp', ''))
   endfunction
 
   function! s:path(path)
-    return substitute(a:path, '[/\\]*$', '', '')
+    return s:trim(a:path)
   endfunction
 
   function! s:dirpath(path)
-    return s:path(a:path) . '/'
+    return substitute(a:path, '[/\\]*$', '/', '')
+  endfunction
+
+  function! s:is_local_plug(repo)
+    return a:repo[0] =~ '[/$~]'
   endfunction
 endif
 
+function! s:err(msg)
+  echohl ErrorMsg
+  echom a:msg
+  echohl None
+  return 0
+endfunction
+
 function! s:esc(path)
   return substitute(a:path, ' ', '\\ ', 'g')
 endfunction
 
 function! s:add_rtp(rtp)
-  execute "set rtp^=".s:esc(a:rtp)
+  execute 'set rtp^='.s:esc(a:rtp)
   let after = globpath(a:rtp, 'after')
   if isdirectory(after)
-    execute "set rtp+=".s:esc(after)
+    execute 'set rtp+='.s:esc(after)
   endif
 endfunction
 
@@ -235,32 +270,31 @@ function! s:lod(plug, types)
   let rtp = s:rtp(a:plug)
   call s:add_rtp(rtp)
   for dir in a:types
-    for vim in split(globpath(rtp, dir.'/**/*.vim'), '\n')
-      execute 'source '.vim
-    endfor
+    call s:source(rtp, dir.'/**/*.vim')
   endfor
 endfunction
 
 function! s:lod_ft(pat, names)
   for name in a:names
-    call s:lod(g:plugs[name], ['plugin', 'after'])
+    call s:lod(g:plugs[name], ['plugin', 'after/plugin'])
   endfor
   call s:reorg_rtp()
   execute 'autocmd! PlugLOD FileType ' . a:pat
   silent! doautocmd filetypeplugin FileType
+  silent! doautocmd filetypeindent FileType
 endfunction
 
 function! s:lod_cmd(cmd, bang, l1, l2, args, name)
   execute 'delc '.a:cmd
-  call s:lod(g:plugs[a:name], ['plugin', 'ftdetect', 'after'])
+  call s:lod(g:plugs[a:name], ['ftdetect', 'after/ftdetect', 'plugin', 'after/plugin'])
   call s:reorg_rtp()
-  execute printf("%s%s%s %s", (a:l1 == a:l2 ? '' : (a:l1.','.a:l2)), a:cmd, a:bang, a:args)
+  execute printf('%s%s%s %s', (a:l1 == a:l2 ? '' : (a:l1.','.a:l2)), a:cmd, a:bang, a:args)
 endfunction
 
 function! s:lod_map(map, name, prefix)
   execute 'unmap '.a:map
   execute 'iunmap '.a:map
-  call s:lod(g:plugs[a:name], ['plugin', 'ftdetect', 'after'])
+  call s:lod(g:plugs[a:name], ['ftdetect', 'after/ftdetect', 'plugin', 'after/plugin'])
   call s:reorg_rtp()
   let extra = ''
   while 1
@@ -273,75 +307,75 @@ function! s:lod_map(map, name, prefix)
   call feedkeys(a:prefix . substitute(a:map, '^<Plug>', "\<Plug>", '') . extra)
 endfunction
 
-function! s:add(force, ...)
-  let opts = { 'branch': 'master', 'frozen': 0 }
-  if a:0 == 1
-    let plugin = a:1
-  elseif a:0 == 2
-    let plugin = a:1
-    if type(a:2) == 1
-      let opts.branch = a:2
-    elseif type(a:2) == 4
-      call extend(opts, a:2)
-      if has_key(opts, 'tag')
-        let opts.branch = remove(opts, 'tag')
-      endif
-    else
-      echoerr "Invalid argument type (expected: string or dictionary)"
-      return
+function! s:add(repo, ...)
+  if a:0 > 1
+    return s:err('Invalid number of arguments (1..2)')
+  endif
+
+  try
+    let repo = s:trim(a:repo)
+    let name = fnamemodify(repo, ':t:s?\.git$??')
+    let spec = extend(s:infer_properties(name, repo),
+                    \ a:0 == 1 ? s:parse_options(a:1) : s:base_spec)
+    let g:plugs[name] = spec
+    let g:plugs_order += [name]
+  catch
+    return s:err(v:exception)
+  endtry
+endfunction
+
+function! s:parse_options(arg)
+  let opts = copy(s:base_spec)
+  let type = type(a:arg)
+  if type == s:TYPE.string
+    let opts.branch = a:arg
+  elseif type == s:TYPE.dict
+    call extend(opts, a:arg)
+    if has_key(opts, 'tag')
+      let opts.branch = remove(opts, 'tag')
+    endif
+    if has_key(opts, 'dir')
+      let opts.dir = s:dirpath(expand(opts.dir))
     endif
   else
-    echoerr "Invalid number of arguments (1..2)"
-    return
+    throw 'Invalid argument type (expected: string or dictionary)'
   endif
+  return opts
+endfunction
 
-  let plugin = substitute(plugin, '[/\\]*$', '', '')
-  let name = substitute(split(plugin, '/')[-1], '\.git$', '', '')
-  if !a:force && has_key(g:plugs, name)
-    let s:extended[name] = g:plugs[name]
-    return
-  endif
-
-  if plugin[0] =~ '[/$~]' || plugin =~? '^[a-z]:'
-    let spec = extend(opts, { 'dir': s:dirpath(expand(plugin)) })
+function! s:infer_properties(name, repo)
+  let repo = a:repo
+  if s:is_local_plug(repo)
+    return { 'dir': s:dirpath(expand(repo)) }
   else
-    if plugin =~ ':'
-      let uri = plugin
+    if repo =~ ':'
+      let uri = repo
     else
-      if plugin !~ '/'
-        let plugin = 'vim-scripts/'. plugin
+      if repo !~ '/'
+        let repo = 'vim-scripts/'. repo
       endif
-      let uri = 'https://git:@github.com/' . plugin . '.git'
+      let uri = 'https://git:@github.com/' . repo . '.git'
     endif
-    let dir = s:dirpath( fnamemodify(join([g:plug_home, name], '/'), ':p') )
-    let spec = extend(opts, { 'dir': dir, 'uri': uri })
+    let dir = s:dirpath( fnamemodify(join([g:plug_home, a:name], '/'), ':p') )
+    return { 'dir': dir, 'uri': uri }
   endif
-
-  let g:plugs[name] = spec
-  if !a:force
-    let s:extended[name] = spec
-  endif
-  let g:plugs_order += [name]
 endfunction
 
-function! s:install(...)
-  call s:update_impl(0, a:000)
+function! s:install(force, ...)
+  call s:update_impl(0, a:force, a:000)
 endfunction
 
-function! s:update(...)
-  call s:update_impl(1, a:000)
+function! s:update(force, ...)
+  call s:update_impl(1, a:force, a:000)
 endfunction
 
-function! s:apply()
+function! s:helptags()
   for spec in values(g:plugs)
     let docd = join([spec.dir, 'doc'], '/')
     if isdirectory(docd)
-      silent! execute "helptags ". join([spec.dir, 'doc'], '/')
+      silent! execute 'helptags '. s:esc(docd)
     endif
   endfor
-  runtime! plugin/*.vim
-  runtime! after/*.vim
-  silent! source $MYVIMRC
 endfunction
 
 function! s:syntax()
@@ -354,7 +388,8 @@ function! s:syntax()
   syn match plugDash /^-/
   syn match plugPlus /^+/
   syn match plugStar /^*/
-  syn match plugName /\(^- \)\@<=[^:]*/
+  syn match plugMessage /\(^- \)\@<=.*/
+  syn match plugName /\(^- \)\@<=[^ ]*:/
   syn match plugInstall /\(^+ \)\@<=[^:]*/
   syn match plugUpdate /\(^* \)\@<=[^:]*/
   syn match plugCommit /^  [0-9a-z]\{7} .*/ contains=plugRelDate,plugSha
@@ -372,6 +407,7 @@ function! s:syntax()
   hi def link plugPlus    Constant
   hi def link plugStar    Boolean
 
+  hi def link plugMessage Function
   hi def link plugName    Label
   hi def link plugInstall Function
   hi def link plugUpdate  Type
@@ -424,19 +460,59 @@ function! s:assign_name()
   let name   = prefix
   let idx    = 2
   while bufexists(name)
-    let name = printf("%s (%s)", prefix, idx)
+    let name = printf('%s (%s)', prefix, idx)
     let idx = idx + 1
   endwhile
-  silent! execute "f ".fnameescape(name)
+  silent! execute 'f '.fnameescape(name)
+endfunction
+
+function! s:do(pull, force, todo)
+  for [name, spec] in items(a:todo)
+    if !isdirectory(spec.dir)
+      continue
+    endif
+    execute 'cd '.s:esc(spec.dir)
+    let installed = has_key(s:prev_update.new, name)
+    let updated = installed ? 0 :
+      \ (a:pull && !empty(s:system_chomp('git log --pretty=format:"%h" "HEAD...HEAD@{1}"')))
+    if a:force || installed || updated
+      call append(3, '- Post-update hook for '. name .' ... ')
+      let type = type(spec.do)
+      if type == s:TYPE.string
+        try
+          " FIXME: Escaping is incomplete. We could use shellescape with eval,
+          "        but it won't work on Windows.
+          let g:_plug_do = '!'.escape(spec.do, '#!%')
+          execute "normal! :execute g:_plug_do\<cr>\<cr>"
+        finally
+          let result = v:shell_error ? ('Exit status: '.v:shell_error) : 'Done!'
+          unlet g:_plug_do
+        endtry
+      elseif type == s:TYPE.funcref
+        try
+          let status = installed ? 'installed' : (updated ? 'updated' : 'unchanged')
+          call spec.do({ 'name': name, 'status': status, 'force': a:force })
+          let result = 'Done!'
+        catch
+          let result = 'Error: ' . v:exception
+        endtry
+      else
+        let result = 'Error: Invalid type!'
+      endif
+      call setline(4, getline(4) . result)
+    endif
+    cd -
+  endfor
 endfunction
 
 function! s:finish(pull)
   call append(3, '- Finishing ... ')
   redraw
-  call s:apply()
-  call s:syntax()
+  call s:helptags()
+  call plug#end()
   call setline(4, getline(4) . 'Done!')
   normal! gg
+  call s:syntax()
   redraw
   let msgs = []
   if !empty(s:prev_update.errors)
@@ -452,7 +528,7 @@ function! s:retry()
   if empty(s:prev_update.errors)
     return
   endif
-  call s:update_impl(s:prev_update.pull,
+  call s:update_impl(s:prev_update.pull, s:prev_update.force,
         \ extend(copy(s:prev_update.errors), [s:prev_update.threads]))
 endfunction
 
@@ -464,13 +540,14 @@ function! s:names(...)
   return filter(keys(g:plugs), 'stridx(v:val, a:1) == 0 && s:is_managed(v:val)')
 endfunction
 
-function! s:update_impl(pull, args) abort
+function! s:update_impl(pull, force, args) abort
+  let st = reltime()
   let args = copy(a:args)
   let threads = (len(args) > 0 && args[-1] =~ '^[1-9][0-9]*$') ?
                   \ remove(args, -1) : get(g:, 'plug_threads', 16)
 
   let managed = filter(copy(g:plugs), 's:is_managed(v:key)')
-  let todo = empty(args) ? filter(managed, '!get(v:val, "frozen", 0)') :
+  let todo = empty(args) ? filter(managed, '!v:val.frozen') :
                          \ filter(managed, 'index(args, v:key) >= 0')
 
   if empty(todo)
@@ -480,14 +557,22 @@ function! s:update_impl(pull, args) abort
     return
   endif
 
+  if !isdirectory(g:plug_home)
+    try
+      call mkdir(g:plug_home, 'p')
+    catch
+      return s:err(printf('Invalid plug directory: %s.'
+                        \ 'Try to call plug#begin with a valid directory', g:plug_home))
+    endtry
+  endif
+
   call s:prepare()
   call append(0, a:pull ? 'Updating plugins' : 'Installing plugins')
   call append(1, '['. s:lpad('', len(todo)) .']')
   normal! 2G
   redraw
 
-  let len = len(g:plugs)
-  let s:prev_update = { 'errors': [], 'pull': a:pull, 'threads': threads }
+  let s:prev_update = { 'errors': [], 'pull': a:pull, 'force': a:force, 'new': {}, 'threads': threads }
   if has('ruby') && threads > 1
     try
       let imd = &imd
@@ -517,92 +602,59 @@ function! s:update_impl(pull, args) abort
   else
     call s:update_serial(a:pull, todo)
   endif
-  if len(g:plugs) > len
-    call plug#end()
-  endif
+  call s:do(a:pull, a:force, filter(copy(todo), 'has_key(v:val, "do")'))
   call s:finish(a:pull)
-endfunction
-
-function! s:extend(names)
-  let s:extended = {}
-  try
-    command! -nargs=+ Plug call s:add(0, <args>)
-    for name in a:names
-      let plugfile = globpath(s:rtp(g:plugs[name]), s:plug_file)
-      if filereadable(plugfile)
-        execute "source ". s:esc(plugfile)
-      endif
-    endfor
-  finally
-    command! -nargs=+ Plug call s:add(1, <args>)
-  endtry
-  return s:extended
+  call setline(1, 'Updated. Elapsed time: ' . split(reltimestr(reltime(st)))[0] . ' sec.')
 endfunction
 
 function! s:update_progress(pull, cnt, bar, total)
   call setline(1, (a:pull ? 'Updating' : 'Installing').
-        \ " plugins (".a:cnt."/".a:total.")")
+        \ ' plugins ('.a:cnt.'/'.a:total.')')
   call s:progress_bar(2, a:bar, a:total)
   normal! 2G
   redraw
 endfunction
 
 function! s:update_serial(pull, todo)
-  let st    = reltime()
   let base  = g:plug_home
   let todo  = copy(a:todo)
   let total = len(todo)
   let done  = {}
   let bar   = ''
 
-  while !empty(todo)
-    for [name, spec] in items(todo)
-      let done[name] = 1
-      if isdirectory(spec.dir)
-        execute 'cd '.s:esc(spec.dir)
-        let [valid, msg] = s:git_valid(spec, 0, 0)
-        if valid
-          let result = a:pull ?
-            \ s:system(
-            \ printf('git checkout -q %s 2>&1 && git pull origin %s 2>&1 && git submodule update --init --recursive 2>&1',
-            \   s:shellesc(spec.branch), s:shellesc(spec.branch))) : 'Already installed'
-          let error = a:pull ? v:shell_error != 0 : 0
-        else
-          let result = msg
-          let error = 1
-        endif
-        cd -
+  for [name, spec] in items(todo)
+    let done[name] = 1
+    if isdirectory(spec.dir)
+      execute 'cd '.s:esc(spec.dir)
+      let [valid, msg] = s:git_valid(spec, 0, 0)
+      if valid
+        let result = a:pull ?
+          \ s:system(
+          \ printf('git checkout -q %s 2>&1 && git pull origin %s 2>&1 && git submodule update --init --recursive 2>&1',
+          \   s:shellesc(spec.branch), s:shellesc(spec.branch))) : 'Already installed'
+        let error = a:pull ? v:shell_error != 0 : 0
       else
-        if !isdirectory(base)
-          call mkdir(base, 'p')
-        endif
-        let result = s:system(
-              \ printf('git clone --recursive %s -b %s %s 2>&1 && cd %s && git submodule update --init --recursive 2>&1',
-              \ s:shellesc(spec.uri),
-              \ s:shellesc(spec.branch),
-              \ s:shellesc(substitute(spec.dir, '[\/]\+$', '', '')),
-              \ s:shellesc(spec.dir)))
-        let error = v:shell_error != 0
+        let result = msg
+        let error = 1
       endif
-      let bar .= error ? 'x' : '='
-      if error
-        call add(s:prev_update.errors, name)
-      endif
-      call append(3, s:format_message(!error, name, result))
-      call s:update_progress(a:pull, len(done), bar, total)
-    endfor
-
-    let extended = s:extend(keys(todo))
-    if !empty(extended)
-      let todo = filter(extended, '!has_key(done, v:key)')
-      let total += len(todo)
-      call s:update_progress(a:pull, len(done), bar, total)
+      cd -
     else
-      break
+      let result = s:system(
+            \ printf('git clone --recursive %s -b %s %s 2>&1 && cd %s && git submodule update --init --recursive 2>&1',
+            \ s:shellesc(spec.uri),
+            \ s:shellesc(spec.branch),
+            \ s:shellesc(s:trim(spec.dir)),
+            \ s:shellesc(spec.dir)))
+      let error = v:shell_error != 0
+      if !error | let s:prev_update.new[name] = 1 | endif
     endif
-  endwhile
-
-  call setline(1, "Updated. Elapsed time: " . split(reltimestr(reltime(st)))[0] . ' sec.')
+    let bar .= error ? 'x' : '='
+    if error
+      call add(s:prev_update.errors, name)
+    endif
+    call append(3, s:format_message(!error, name, result))
+    call s:update_progress(a:pull, len(done), bar, total)
+  endfor
 endfunction
 
 function! s:update_parallel(pull, todo, threads)
@@ -628,16 +680,28 @@ function! s:update_parallel(pull, todo, threads)
     %["#{arg.gsub('"', '\"')}"]
   end
 
-  require 'set'
+  def killall pid
+    pids = [pid]
+    unless `which pgrep`.empty?
+      children = pids
+      until children.empty?
+        children = children.map { |pid|
+          `pgrep -P #{pid}`.lines.map { |l| l.chomp }
+        }.flatten
+        pids += children
+      end
+    end
+    pids.each { |pid| Process.kill 'TERM', pid.to_i rescue nil }
+  end
+
   require 'thread'
   require 'fileutils'
   require 'timeout'
   running = true
-  st    = Time.now
   iswin = VIM::evaluate('s:is_win').to_i == 1
   pull  = VIM::evaluate('a:pull').to_i == 1
   base  = VIM::evaluate('g:plug_home')
-  all   = VIM::evaluate('copy(a:todo)')
+  all   = VIM::evaluate('a:todo')
   limit = VIM::evaluate('get(g:, "plug_timeout", 60)')
   tries = VIM::evaluate('get(g:, "plug_retries", 2)') + 1
   nthr  = VIM::evaluate('a:threads').to_i
@@ -712,17 +776,7 @@ function! s:update_parallel(pull, todo, threads)
       [$? == 0, data.chomp]
     rescue Timeout::Error, Interrupt => e
       if fd && !fd.closed?
-        pids = [fd.pid]
-        unless `which pgrep`.empty?
-          children = pids
-          until children.empty?
-            children = children.map { |pid|
-              `pgrep -P #{pid}`.lines.map { |l| l.chomp }
-            }.flatten
-            pids += children
-          end
-        end
-        pids.each { |pid| Process.kill 'TERM', pid.to_i rescue nil }
+        killall fd.pid
         fd.close
       end
       if e.is_a?(Timeout::Error) && tried < tries
@@ -760,65 +814,54 @@ function! s:update_parallel(pull, todo, threads)
     end
   } if VIM::evaluate('s:mac_gui') == 1
 
-  processed = Set.new
   progress = iswin ? '' : '--progress'
-  until all.empty?
-    names = all.keys
-    processed.merge names
-    [names.length, nthr].min.times do
-      mtx.synchronize do
-        threads << Thread.new {
-          while pair = take1.call
-            name = pair.first
-            dir, uri, branch = pair.last.values_at *%w[dir uri branch]
-            branch = esc branch
-            subm = "git submodule update --init --recursive 2>&1"
-            ok, result =
-              if File.directory? dir
-                dir = esc dir
-                ret, data = bt.call "#{cd} #{dir} && git rev-parse --abbrev-ref HEAD 2>&1 && git config remote.origin.url", nil, nil
-                current_uri = data.lines.to_a.last
-                if !ret
-                  if data =~ /^Interrupted|^Timeout/
-                    [false, data]
-                  else
-                    [false, [data.chomp, "PlugClean required."].join($/)]
-                  end
-                elsif current_uri.sub(/git:@/, '') != uri.sub(/git:@/, '')
-                  [false, ["Invalid URI: #{current_uri}",
-                           "Expected:    #{uri}",
-                           "PlugClean required."].join($/)]
+  [all.length, nthr].min.times do
+    mtx.synchronize do
+      threads << Thread.new {
+        while pair = take1.call
+          name = pair.first
+          dir, uri, branch = pair.last.values_at *%w[dir uri branch]
+          branch = esc branch
+          subm = "git submodule update --init --recursive 2>&1"
+          exists = File.directory? dir
+          ok, result =
+            if exists
+              dir = esc dir
+              ret, data = bt.call "#{cd} #{dir} && git rev-parse --abbrev-ref HEAD 2>&1 && git config remote.origin.url", nil, nil
+              current_uri = data.lines.to_a.last
+              if !ret
+                if data =~ /^Interrupted|^Timeout/
+                  [false, data]
                 else
-                  if pull
-                    log.call name, 'Updating ...', :update
-                    bt.call "#{cd} #{dir} && git checkout -q #{branch} 2>&1 && (git pull origin #{branch} #{progress} 2>&1 && #{subm})", name, :update
-                  else
-                    [true, skip]
-                  end
+                  [false, [data.chomp, "PlugClean required."].join($/)]
                 end
+              elsif current_uri.sub(/git:@/, '') != uri.sub(/git:@/, '')
+                [false, ["Invalid URI: #{current_uri}",
+                         "Expected:    #{uri}",
+                         "PlugClean required."].join($/)]
               else
-                FileUtils.mkdir_p(base)
-                d = esc dir.sub(%r{[\\/]+$}, '')
-                log.call name, 'Installing ...', :install
-                bt.call "(git clone #{progress} --recursive #{uri} -b #{branch} #{d} 2>&1 && cd #{esc dir} && #{subm})", name, :install
+                if pull
+                  log.call name, 'Updating ...', :update
+                  bt.call "#{cd} #{dir} && git checkout -q #{branch} 2>&1 && (git pull origin #{branch} #{progress} 2>&1 && #{subm})", name, :update
+                else
+                  [true, skip]
+                end
               end
-            log.call name, result, ok
-          end
-        } if running
-      end
+            else
+              d = esc dir.sub(%r{[\\/]+$}, '')
+              log.call name, 'Installing ...', :install
+              bt.call "(git clone #{progress} --recursive #{uri} -b #{branch} #{d} 2>&1 && cd #{esc dir} && #{subm})", name, :install
+            end
+          mtx.synchronize { VIM::command("let s:prev_update.new['#{name}'] = 1") } if !exists && ok
+          log.call name, result, ok
+        end
+      } if running
     end
-    threads.each { |t| t.join rescue nil }
-    mtx.synchronize { threads.clear }
-    extended = Hash[(VIM::evaluate("s:extend(#{names.inspect})") || {}).reject { |k, _|
-      processed.include? k
-    }]
-    tot += extended.length
-    all.merge!(extended)
-    logh.call
   end
+  threads.each { |t| t.join rescue nil }
+  logh.call
   refresh.kill if refresh
   watcher.kill
-  $curbuf[1] = "Updated. Elapsed time: #{"%.6f" % (Time.now - st)} sec."
 EOF
 endfunction
 
@@ -862,16 +905,16 @@ function! s:git_valid(spec, check_branch, cd)
   let ret = 1
   let msg = 'OK'
   if isdirectory(a:spec.dir)
-    if a:cd | execute "cd " . s:esc(a:spec.dir) | endif
-    let result = split(s:system("git rev-parse --abbrev-ref HEAD 2>&1 && git config remote.origin.url"), '\n')
+    if a:cd | execute 'cd ' . s:esc(a:spec.dir) | endif
+    let result = split(s:system('git rev-parse --abbrev-ref HEAD 2>&1 && git config remote.origin.url'), '\n')
     let remote = result[-1]
     if v:shell_error
-      let msg = join([remote, "PlugClean required."], "\n")
+      let msg = join([remote, 'PlugClean required.'], "\n")
       let ret = 0
     elseif !s:compare_git_uri(remote, a:spec.uri)
       let msg = join(['Invalid URI: '.remote,
                     \ 'Expected:    '.a:spec.uri,
-                    \ "PlugClean required."], "\n")
+                    \ 'PlugClean required.'], "\n")
       let ret = 0
     elseif a:check_branch
       let branch = result[0]
@@ -936,7 +979,7 @@ function! s:clean(force)
     call append(line('$'), 'Already clean.')
   else
     call inputsave()
-    let yes = a:force || (input("Proceed? (Y/N) ") =~? '^y')
+    let yes = a:force || (input('Proceed? (Y/N) ') =~? '^y')
     call inputrestore()
     if yes
       for dir in todo
@@ -956,24 +999,20 @@ function! s:upgrade()
   if executable('curl')
     let mee = s:shellesc(s:me)
     let new = s:shellesc(s:me . '.new')
-    echo "Downloading ". s:plug_source
+    echo 'Downloading '. s:plug_source
     redraw
     let mv = s:is_win ? 'move /Y' : 'mv -f'
     let cp = s:is_win ? 'copy /Y' : 'cp -f'
     call system(printf(
-      \ "curl -fLo %s %s && ".cp." %s %s.old && ".mv." %s %s",
+      \ 'curl -fLo %s %s && '.cp.' %s %s.old && '.mv.' %s %s',
       \ new, s:plug_source, mee, mee, new, mee))
-    if v:shell_error == 0
-      unlet g:loaded_plug
-      echo "Downloaded ". s:plug_source
-      return 1
-    else
-      echoerr "Error upgrading vim-plug"
-      return 0
+    if v:shell_error
+      return s:err('Error upgrading vim-plug')
     endif
   elseif has('ruby')
-    echo "Downloading ". s:plug_source
-    ruby << EOF
+    echo 'Downloading '. s:plug_source
+    try
+      ruby << EOF
       require 'open-uri'
       require 'fileutils'
       me  = VIM::evaluate('s:me')
@@ -985,13 +1024,22 @@ function! s:upgrade()
       FileUtils.cp me, old
       File.rename  new, me
 EOF
-    unlet g:loaded_plug
-    echo "Downloaded ". s:plug_source
-    return 1
+    catch
+      return s:err('Error upgrading vim-plug')
+    endtry
   else
-    echoerr "curl executable or ruby support not found"
-    return 0
+    return s:err('curl executable or ruby support not found')
   endif
+
+  unlet g:loaded_plug
+  echo 'Downloaded '. s:plug_source
+  return 1
+endfunction
+
+function! s:upgrade_specs()
+  for spec in values(g:plugs)
+    let spec.frozen = get(spec, 'frozen', 0)
+  endfor
 endfunction
 
 function! s:status()
@@ -1082,7 +1130,7 @@ function! s:diff()
     endif
 
     execute 'cd '.s:esc(v.dir)
-    let diff = system('git log --pretty=format:"%h %s (%cr)" "HEAD@{0}...HEAD@{1}"')
+    let diff = system('git log --pretty=format:"%h %s (%cr)" "HEAD...HEAD@{1}"')
     if !v:shell_error && !empty(diff)
       call append(1, '')
       call append(2, '- '.k.':')
@@ -1102,6 +1150,12 @@ endfunction
 let s:first_rtp = s:esc(get(split(&rtp, ','), 0, ''))
 let s:last_rtp = s:esc(get(split(&rtp, ','), -1, ''))
 
+if exists('g:plugs')
+  let g:plugs_order = get(g:, 'plugs_order', keys(g:plugs))
+  call s:upgrade_specs()
+  call s:define_commands()
+endif
+
 let &cpo = s:cpo_save
 unlet s:cpo_save
 

test/run

@@ -14,8 +14,26 @@ if [ ! -d fzf-staged ]; then
   git clone https://github.com/junegunn/fzf.git fzf-staged
 fi
 
+make_dirs() {
+  mkdir -p "$1"
+  cd "$1"
+  mkdir -p autoload colors ftdetect ftplugin indent plugin syntax
+  for d in *; do
+    cat > $d/xxx.vim << EOF
+    " echom expand('<sfile>')
+    let g:xxx = get(g:, 'xxx', [])
+    call add(g:xxx, '${1:4}/$d')
+EOF
+  done
+  cd - > /dev/null
+}
+
+make_dirs xxx/
+make_dirs xxx/after
+
 cat > /tmp/mini-vimrc << VIMRC
 set rtp+=vader.vim
+set shell=/bin/bash
 source $PLUG_SRC
 VIMRC
 

test/workflow.vader

@@ -1,5 +1,5 @@
 Execute (Initialize test environment):
-  Save &rtp, g:plugs, g:plug_home, $MYVIMRC
+  Save &rtp, g:plugs, g:plug_home
 
   let first_rtp = split(&rtp, ',')[0]
   let last_rtp  = split(&rtp, ',')[-1]
@@ -33,18 +33,17 @@ Execute (Initialize test environment):
   endfunction
   command! -nargs=+ -bang AssertExpect call AssertExpect('<bang>' == '!', <args>)
 
-  let g:vimrc_reloaded = 0
-  let vimrc    = tempname()
-  call writefile(['let g:vimrc_reloaded += 1'], vimrc)
-  let $MYVIMRC = vimrc
+Execute (Print Ruby version):
+  redir => out
+  silent ruby puts RUBY_VERSION
+  redir END
+  Log substitute(out, '\n', '', 'g')
 
 Execute (plug#end() before plug#begin() should fail):
-  try
-    call plug#end()
-    Assert 0, 'should not reach here'
-  catch
-    Assert stridx(v:exception, 'Call plug#begin() first') >= 0
-  endtry
+  redir => out
+  AssertEqual 0, plug#end()
+  redir END
+  Assert stridx(out, 'Call plug#begin() first') >= 0
 
 Execute (plug#begin() without path argument):
   call plug#begin()
@@ -54,12 +53,10 @@ Execute (plug#begin() without path argument):
 Execute (plug#begin() without path argument with empty &rtp):
   let save_rtp = &rtp
   set rtp=
-  try
-    call plug#begin()
-    Assert 0, 'should not reach here'
-  catch
-    Assert stridx(v:exception, 'Unable to determine plug home') >= 0, 'Got: '.v:exception
-  endtry
+  redir => out
+  AssertEqual 0, plug#begin()
+  redir END
+  Assert stridx(out, 'Unable to determine plug home') >= 0
   let &rtp = save_rtp
 
 Execute (plug#begin(path)):
@@ -137,7 +134,6 @@ Execute (Yet, plugins are not available):
 
 Execute (PlugInstall):
   PlugInstall
-  AssertEqual 1, g:vimrc_reloaded
   q
 
 Execute (Plugin available after installation):
@@ -171,7 +167,6 @@ Expect:
 Execute (PlugUpdate to set the right branch):
   PlugUpdate
   call PlugStatusSorted()
-  AssertEqual 2, g:vimrc_reloaded
 
 Expect:
   - goyo.vim: OK
@@ -258,7 +253,6 @@ Execute (PlugClean! to remove vim-emoji):
 Execute (PlugUpdate to install both again):
   PlugUpdate
   AssertExpect '^- [^:]*:', 2
-  AssertEqual 3, g:vimrc_reloaded
   Assert !empty(globpath(&rtp, 'colors/seoul256.vim')), 'seoul256.vim should be found'
   Assert !empty(globpath(&rtp, 'autoload/emoji.vim')), 'vim-emoji should be found'
   q
@@ -266,7 +260,6 @@ Execute (PlugUpdate to install both again):
 Execute (PlugUpdate only to find out plugins are up-to-date, D key to check):
   PlugUpdate
   AssertExpect 'Already up-to-date', 2
-  AssertEqual 4, g:vimrc_reloaded
   normal D
   AssertEqual 'No updates.', getline(1)
   q
@@ -361,7 +354,8 @@ Execute (Trying to execute on-demand commands when plugin is not installed):
 
 Execute (New set of plugins):
   call plug#begin()
-  Plug 'junegunn/vim-fnr' " Depends on vim-pseudocl
+  Plug 'junegunn/vim-fnr'
+  Plug 'junegunn/vim-pseudocl'
   Plug 'junegunn/vim-easy-align', { 'on': 'EasyAlign' }
   Plug 'junegunn/vim-redis',      { 'for': 'redis' }
   call plug#end()
@@ -372,31 +366,36 @@ Execute (Check commands):
 
 Execute (Partial PlugInstall):
   PlugInstall vim-fnr vim-easy-align
-  AssertExpect 'vim-pseudocl', 1
-  PlugInstall vim-fnr vim-easy-align 1
-  AssertExpect 'vim-pseudocl', 1
+  AssertExpect 'vim-fnr', 1
   q
 
-Execute (Check dependent plugin):
-  Assert &rtp =~ 'pseudocl', &rtp
+  PlugInstall vim-fnr vim-easy-align 1
+  AssertExpect 'vim-fnr', 1
+  AssertExpect 'vim-easy-align', 1
   AssertEqual first_rtp, split(&rtp, ',')[0]
   AssertEqual last_rtp, split(&rtp, ',')[-1]
+  q
 
 Given (Unaligned code):
   a=1
   aa=2
 
 Execute (Check installed plugins):
+  if has('vim_starting')
+    Log 'Vader is run from commandline'
+    runtime! plugin/**/*.vim
+  endif
   Assert exists(':FNR'),           'FNR command should be found'
-  Assert exists(':EasyAlign'),     'EasyAlign command should be found'
   Assert !exists(':RedisExecute'), 'RedisExecute command still should not be found'
+
+  Assert exists(':EasyAlign'), 'EasyAlign command should be found'
   %EasyAlign=
 
 Expect (Aligned code):
   a  = 1
   aa = 2
 
-Given (nothing):
+Given:
 Execute (Partial PlugUpdate):
   PlugUpdate vim-redis
   q
@@ -513,15 +512,15 @@ Execute (Frozen plugin are not installed nor updated):
   Plug 'junegunn/vim-easy-align', { 'frozen': 1 }
   call plug#end()
 
-  redir => output
+  redir => out
   silent PlugInstall
   redir END
-  Assert output =~ 'No plugin to install'
+  Assert out =~ 'No plugin to install'
 
-  redir => output
+  redir => out
   silent PlugUpdate
   redir END
-  Assert output =~ 'No plugin to update'
+  Assert out =~ 'No plugin to update'
 
 Execute (But you can still install it if the name is given as the argument):
   PlugInstall vim-easy-align
@@ -576,16 +575,205 @@ Execute (Retry failed tasks):
   AssertExpect! '[xxx]', 1
   q
 
-Execute (Cleanup):
-  call system('rm -rf '.temp_plugged)
-  call rename('fzf', 'fzf-staged')
+**********************************************************************
+~ Post-update hook (`do` option)
+**********************************************************************
 
-  unlet g:plugs
-  unlet g:plug_home
-  unlet g:vimrc_reloaded
-  unlet temp_plugged vader plug basertp save_rtp repo lnum fzf
-  delf PlugStatusSorted
-  delf AssertExpect
-  delc AssertExpect
+Execute (Cleanup):
+  call plug#begin()
+  call plug#end()
+  PlugClean!
+
+Execute (On install):
+  call plug#begin()
+  Plug 'junegunn/vim-easy-align', { 'do': 'touch installed' }
+  Plug 'junegunn/vim-pseudocl'
+  call plug#end()
+
+  PlugInstall
+  q
+
+  Assert filereadable(g:plugs['vim-easy-align'].dir.'/installed'),
+    \ 'vim-easy-align/installed should exist'
+  Assert !filereadable(g:plugs['vim-pseudocl'].dir.'/installed'),
+    \ 'vim-pseudocl/installed should not exist'
+
+Execute (On update):
+  call plug#begin()
+  Plug 'junegunn/vim-easy-align', { 'do': 'touch updated' }
+  Plug 'junegunn/vim-pseudocl', { 'do': 'touch updated' }
+  call plug#end()
+
+  " Reset for updates
+  call system('cd '.g:plugs['vim-pseudocl'].dir.' && git reset --hard HEAD^')
+
+  PlugUpdate
+  Log getline(1, '$')
+  q
+
+  Assert !filereadable(g:plugs['vim-easy-align'].dir.'/updated'),
+    \ 'vim-easy-align/updated should not exist'
+  Assert filereadable(g:plugs['vim-pseudocl'].dir.'/updated'),
+    \ 'vim-pseudocl/updated should exist'
+
+Execute (When already installed):
+  call plug#begin()
+  Plug 'junegunn/vim-easy-align', { 'do': 'touch installed2' }
+  Plug 'junegunn/vim-pseudocl', { 'do': 'touch installed2' }
+  call plug#end()
+
+  PlugInstall
+  q
+  Assert !filereadable(g:plugs['vim-easy-align'].dir.'/installed2'),
+    \ 'vim-easy-align/installed2 should not exist'
+  Assert !filereadable(g:plugs['vim-pseudocl'].dir.'/installed2'),
+    \ 'vim-pseudocl/installed2 should not exist'
+
+Execute (PlugInstall!):
+  PlugInstall!
+  q
+  Assert filereadable(g:plugs['vim-easy-align'].dir.'/installed2'),
+    \ 'vim-easy-align/installed2 should exist'
+  Assert filereadable(g:plugs['vim-pseudocl'].dir.'/installed2'),
+    \ 'vim-pseudocl/installed2 should exist'
+
+Execute (When already updated):
+  call plug#begin()
+  Plug 'junegunn/vim-easy-align', { 'do': 'touch updated2' }
+  Plug 'junegunn/vim-pseudocl', { 'do': 'touch updated2' }
+  call plug#end()
+
+  PlugUpdate
+  q
+  Assert !filereadable(g:plugs['vim-easy-align'].dir.'/updated2'),
+    \ 'vim-easy-align/updated2 should not exist'
+  Assert !filereadable(g:plugs['vim-pseudocl'].dir.'/updated2'),
+    \ 'vim-pseudocl/updated2 should not exist'
+
+Execute (PlugUpdate!):
+  PlugUpdate!
+  q
+  Assert filereadable(g:plugs['vim-easy-align'].dir.'/updated2'),
+    \ 'vim-easy-align/updated2 should exist'
+  Assert filereadable(g:plugs['vim-pseudocl'].dir.'/updated2'),
+    \ 'vim-pseudocl/updated2 should exist'
+
+Execute (Using Funcref):
+  function! PlugUpdated(info)
+    call system('touch '. a:info.name . a:info.status . a:info.force . len(a:info))
+  endfunction
+
+  call plug#begin()
+  Plug 'junegunn/vim-easy-align', { 'do': function('PlugUpdated') }
+  Plug 'junegunn/vim-pseudocl',   { 'do': function('PlugUpdated') }
+  call plug#end()
+
+  call system('cd '.g:plugs['vim-easy-align'].dir.' && git reset --hard HEAD^')
+  call system('rm -rf '.g:plugs['vim-pseudocl'].dir)
+
+  PlugUpdate
+  Log getline(1, '$')
+  q
+  Assert filereadable(g:plugs['vim-easy-align'].dir.'/vim-easy-alignupdated03'),
+    \ 'vim-easy-align/vim-easy-alignupdated03 should exist'
+  Assert filereadable(g:plugs['vim-pseudocl'].dir.'/vim-pseudoclinstalled03'),
+    \ 'vim-pseudocl/vim-pseudoclinstalled03 should exist'
+
+  call system('rm -rf '.g:plugs['vim-pseudocl'].dir)
+  PlugInstall!
+  q
+  Assert filereadable(g:plugs['vim-easy-align'].dir.'/vim-easy-alignunchanged13'),
+    \ 'vim-easy-align/vim-easy-alignunchanged13 should exist'
+  Assert filereadable(g:plugs['vim-pseudocl'].dir.'/vim-pseudoclinstalled13'),
+    \ 'vim-pseudocl/vim-pseudoclinstalled13 should exist'
+
+  call system('cd '.g:plugs['vim-easy-align'].dir.' && git reset --hard HEAD^')
+  PlugUpdate!
+  q
+  Assert filereadable(g:plugs['vim-easy-align'].dir.'/vim-easy-alignupdated13'),
+    \ 'vim-easy-align/vim-easy-alignupdated13 should exist'
+  Assert filereadable(g:plugs['vim-pseudocl'].dir.'/vim-pseudoclunchanged13'),
+    \ 'vim-pseudocl/vim-pseudoclunchanged13 should exist'
+
+**********************************************************************
+~ Overriding `dir`
+**********************************************************************
+
+Execute (Using custom dir):
+  Assert isdirectory(g:plugs['vim-easy-align'].dir)
+
+  call system('rm -rf '.$TMPDIR.'easy-align')
+  call plug#begin()
+  Plug 'junegunn/vim-easy-align', { 'dir': $TMPDIR.'easy-align' }
+  call plug#end()
+  AssertEqual $TMPDIR.'easy-align/', g:plugs['vim-easy-align'].dir
+
+  PlugClean!
+  Assert !isdirectory(g:plugs['vim-easy-align'].dir)
+  q
+
+  PlugInstall
+  q
+  Assert isdirectory(g:plugs['vim-easy-align'].dir)
+
+**********************************************************************
+~ On-demand loading load order
+**********************************************************************
+Before (Clear global vars):
+  let g:xxx = []
+  set rtp-=$PWD/xxx/
+  set rtp-=$PWD/xxx/after
+
+Execute (Immediate loading):
+  call plug#begin()
+  Plug '$PWD/xxx'
+  call plug#end()
+
+  " FIXME:
+  " Different result when Vader is run from commandline with `-c` option
+  Log g:xxx
+  if has('vim_starting')
+    AssertEqual ['/ftdetect', 'after/ftdetect'], g:xxx
+  else
+    AssertEqual ['/plugin', 'after/plugin', '/ftdetect', 'after/ftdetect'], g:xxx
+  endif
+
+Execute (Command-based on-demand loading):
+  call plug#begin()
+  Plug '$PWD/xxx', { 'on': 'XXX' }
+  call plug#end()
+
+  AssertEqual [], g:xxx
+
+  silent! XXX
+  AssertEqual ['/ftdetect', 'after/ftdetect', '/plugin', 'after/plugin'], g:xxx
+
+  setf xxx
+  AssertEqual ['/ftdetect', 'after/ftdetect', '/plugin', 'after/plugin', '/ftplugin', 'after/ftplugin', '/indent', 'after/indent', '/syntax', 'after/syntax'], g:xxx
+
+Execute (Filetype-based on-demand loading):
+  call plug#begin()
+  Plug '$PWD/xxx', { 'for': 'xxx' }
+  call plug#end()
+
+  AssertEqual ['/ftdetect', 'after/ftdetect'], g:xxx
+
+  setf xxx
+  AssertEqual ['/ftdetect', 'after/ftdetect', '/plugin', 'after/plugin', '/ftplugin', 'after/ftplugin', '/indent', 'after/indent', '/syntax', 'after/syntax'], g:xxx
+
+Before:
+Execute (Cleanup):
+  silent! call system('rm -rf '.temp_plugged)
+  silent! call rename('fzf', 'fzf-staged')
+  silent! unlet g:plugs
+  silent! unlet g:plug_home
+  silent! unlet temp_plugged vader plug basertp save_rtp repo lnum fzf out
+  silent! delf PlugStatusSorted
+  silent! delf AssertExpect
+  silent! delf PlugUpdated
+  silent! delc AssertExpect
+  silent! unmap /
+  silent! unmap ?
 
   Restore
+