Fix #560 #763 - Silence errors for setting signs, and do nothing for dirvish

* Fix rust linter on windows

* Add windows path test

* Use ale#path#IsBufferPath to compare paths

* Fix errors

.eslintrc.js

@@ -1,11 +0,0 @@
-module.exports = {
-    parserOptions: {
-        ecmaVersion: 6,
-        sourceType: "module",
-    },
-    rules: {
-        semi: 'error',
-        'space-infix-ops': 'warn',
-        radix: 'error',
-    }
-}

.gitattributes

@@ -1,4 +1,5 @@
 .* export-ignore
+/CODE_OF_CONDUCT.md export-ignore
 /CONTRIBUTING.md export-ignore
 /Dockerfile export-ignore
 /ISSUE_TEMPLATE.md export-ignore
@@ -7,4 +8,5 @@
 /README.md export-ignore
 /custom-checks export-ignore
 /img export-ignore
+/run-tests export-ignore
 /test export-ignore

.travis.yml

@@ -7,4 +7,4 @@ branches:
         - master
 language: python
 script: |
-    make test
+    ./run-tests

CODE_OF_CONDUCT.md

@@ -0,0 +1,3 @@
+Codes of conduct are totally unnecessary and dumb.
+
+Just don't be a jerk and have fun.

Dockerfile

@@ -1,25 +1,18 @@
 FROM tweekmonster/vim-testbed:latest
 
-RUN install_vim -tag v8.0.0000 -build \
-                -tag v8.0.0027 -build
+RUN install_vim -tag v8.0.0027 -build \
+                -tag neovim:v0.1.7 -build
 
-# the clang package includes clang-tidy
 ENV PACKAGES="\
     bash \
     git \
     python \
     py-pip \
-    nodejs \
-    gcc \
-    g++ \
-    clang \
 "
 RUN apk --update add $PACKAGES && \
     rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
 
 RUN pip install vim-vint==0.3.9
 
-RUN npm install -g eslint@3.7.1
-
 RUN git clone https://github.com/junegunn/vader.vim vader && \
     cd vader && git checkout c6243dd81c98350df4dec608fa972df98fa2a3af

ISSUE_TEMPLATE.md

@@ -1,12 +1,12 @@
 <!--
+READ THIS FIRST: If you are experiencing any bug whatsoever dealing with
+the output of linters, please use `let g:ale_history_log_output = 1` before
+pasting output. It will capture the output of commands that are run.
+
 For bugs, paste output from your clipboard after running :ALEInfoToClipboard
 here. If that doesn't work for some reason, try running :ALEInfo and copying
 the output from that here instead. If everything is broken, run around in
 circles and scream.
 
-If you are experiencing a bug where ALE is not correctly parsing the output of
-commands, set g:ale_history_log_output to 1, and run ALE again, and then
-:ALEInfo should include the full output of each command which ran.
-
 Whatever the case, describe the your issue here.
 -->

Makefile

@@ -1,53 +0,0 @@
-SHELL := /usr/bin/env bash
-IMAGE ?= w0rp/ale:30a9967dbdb1
-CURRENT_IMAGE_ID = 30a9967dbdb1
-DOCKER_FLAGS = --rm -v $(PWD):/testplugin -v $(PWD)/test:/home "$(IMAGE)"
-tests = test/*.vader test/*/*.vader test/*/*/*.vader test/*/*/*/*.vader
-
-test-setup:
-	docker images -q w0rp/ale | grep ^$(CURRENT_IMAGE_ID) > /dev/null || \
-		docker pull w0rp/ale
-
-vader: test-setup
-	@:; \
-	vims=$$(docker run --rm $(IMAGE) ls /vim-build/bin | grep -E '^n?vim'); \
-	if [ -z "$$vims" ]; then echo "No Vims found!"; exit 1; fi; \
-	for vim in $$vims; do \
-		docker run -a stderr $(DOCKER_FLAGS) $$vim '+Vader! $(tests)'; \
-	done
-
-test: test-setup
-	@:; \
-	vims=$$(docker run --rm $(IMAGE) ls /vim-build/bin | grep -E '^n?vim'); \
-	if [ -z "$$vims" ]; then echo "No Vims found!"; exit 1; fi; \
-	EXIT=0; \
-	for vim in $$vims; do \
-		echo; \
-		echo '========================================'; \
-		echo "Running tests for $$vim"; \
-		echo '========================================'; \
-		echo; \
-		docker run -a stderr $(DOCKER_FLAGS) $$vim '+Vader! $(tests)' || EXIT=$$?; \
-	done; \
-	echo; \
-	echo '========================================'; \
-	echo 'Running Vint to lint our code'; \
-	echo '========================================'; \
-	echo 'Vint warnings/errors follow:'; \
-	echo; \
-	set -o pipefail; \
-	docker run -a stdout $(DOCKER_FLAGS) vint -s /testplugin | sed s:^/testplugin/:: || EXIT=$$?; \
-	set +o pipefail; \
-	echo; \
-	echo '========================================'; \
-	echo 'Running custom checks'; \
-	echo '========================================'; \
-	echo 'Custom warnings/errors follow:'; \
-	echo; \
-	set -o pipefail; \
-	docker run -v $(PWD):/testplugin "$(IMAGE)" /testplugin/custom-checks /testplugin | sed s:^/testplugin/:: || EXIT=$$?; \
-	set +o pipefail; \
-	echo; \
-	exit $$EXIT;
-
-.DEFAULT_GOAL := test

README.md

@@ -15,6 +15,9 @@ back to a filesystem.
 
 In other words, this plugin allows you to lint while you type.
 
+ALE also supports fixing problems with files by running commands in the
+background with a command `ALEFix`.
+
 ## Table of Contents
 
 1. [Supported Languages and Tools](#supported-languages)
@@ -55,10 +58,11 @@ name. That seems to be the fairest way to arrange this table.
 | ASM | [gcc](https://gcc.gnu.org) |
 | Ansible | [ansible-lint](https://github.com/willthames/ansible-lint) |
 | AsciiDoc | [proselint](http://proselint.com/)|
+| Awk | [gawk](https://www.gnu.org/software/gawk/)|
 | Bash | [-n flag](https://www.gnu.org/software/bash/manual/bash.html#index-set), [shellcheck](https://www.shellcheck.net/) |
 | Bourne Shell | [-n flag](http://linux.die.net/man/1/sh), [shellcheck](https://www.shellcheck.net/) |
 | C | [cppcheck](http://cppcheck.sourceforge.net), [gcc](https://gcc.gnu.org/), [clang](http://clang.llvm.org/)|
-| C++ (filetype cpp) | [clang](http://clang.llvm.org/), [clangtidy](http://clang.llvm.org/extra/clang-tidy/), [cppcheck](http://cppcheck.sourceforge.net), [gcc](https://gcc.gnu.org/)|
+| C++ (filetype cpp) | [clang](http://clang.llvm.org/), [clangcheck](http://clang.llvm.org/docs/ClangCheck.html), [clangtidy](http://clang.llvm.org/extra/clang-tidy/), [cppcheck](http://cppcheck.sourceforge.net), [cpplint](https://github.com/google/styleguide/tree/gh-pages/cpplint), [gcc](https://gcc.gnu.org/)|
 | C# | [mcs](http://www.mono-project.com/docs/about-mono/languages/csharp/) |
 | Chef | [foodcritic](http://www.foodcritic.io/) |
 | CMake | [cmakelint](https://github.com/richq/cmake-lint) |
@@ -73,15 +77,16 @@ name. That seems to be the fairest way to arrange this table.
 | Erb | [erb](https://github.com/jeremyevans/erubi) |
 | Erlang | [erlc](http://erlang.org/doc/man/erlc.html) |
 | Fortran | [gcc](https://gcc.gnu.org/) |
+| FusionScript | [fusion-lint](https://github.com/RyanSquared/fusionscript) |
 | Go | [gofmt -e](https://golang.org/cmd/gofmt/), [go vet](https://golang.org/cmd/vet/), [golint](https://godoc.org/github.com/golang/lint), [gometalinter](https://github.com/alecthomas/gometalinter), [go build](https://golang.org/cmd/go/), [gosimple](https://github.com/dominikh/go-tools/tree/master/cmd/gosimple), [staticcheck](https://github.com/dominikh/go-tools/tree/master/cmd/staticcheck) |
 | Haml | [haml-lint](https://github.com/brigade/haml-lint)
 | Handlebars | [ember-template-lint](https://github.com/rwjblue/ember-template-lint) |
-| Haskell | [ghc](https://www.haskell.org/ghc/), [hlint](https://hackage.haskell.org/package/hlint), [hdevtools](https://hackage.haskell.org/package/hdevtools) |
+| Haskell | [ghc](https://www.haskell.org/ghc/), [ghc-mod](https://github.com/DanielG/ghc-mod), [hlint](https://hackage.haskell.org/package/hlint), [hdevtools](https://hackage.haskell.org/package/hdevtools) |
 | HTML | [HTMLHint](http://htmlhint.com/), [proselint](http://proselint.com/), [tidy](http://www.html-tidy.org/) |
-| Java | [javac](http://www.oracle.com/technetwork/java/javase/downloads/index.html) |
-| JavaScript | [eslint](http://eslint.org/), [jscs](http://jscs.info/), [jshint](http://jshint.com/), [flow](https://flowtype.org/), [standard](http://standardjs.com/), [xo](https://github.com/sindresorhus/xo)
+| Java | [checkstyle](http://checkstyle.sourceforge.net), [javac](http://www.oracle.com/technetwork/java/javase/downloads/index.html) |
+| JavaScript | [eslint](http://eslint.org/), [jscs](http://jscs.info/), [jshint](http://jshint.com/), [flow](https://flowtype.org/), [standard](http://standardjs.com/), [prettier](https://github.com/prettier/prettier) (and `prettier-eslint`), [xo](https://github.com/sindresorhus/xo)
 | JSON | [jsonlint](http://zaa.ch/jsonlint/) |
-| Kotlin | [kotlinc](https://kotlinlang.org) see `:help ale-integration-kotlin` for configuration instructions
+| Kotlin | [kotlinc](https://kotlinlang.org), [ktlint](https://ktlint.github.io) see `:help ale-integration-kotlin` for configuration instructions
 | LaTeX | [chktex](http://www.nongnu.org/chktex/), [lacheck](https://www.ctan.org/pkg/lacheck), [proselint](http://proselint.com/) |
 | Lua | [luacheck](https://github.com/mpeterv/luacheck) |
 | Markdown | [mdl](https://github.com/mivok/markdownlint), [proselint](http://proselint.com/), [vale](https://github.com/ValeLint/vale) |
@@ -89,13 +94,15 @@ name. That seems to be the fairest way to arrange this table.
 | Nim | [nim](https://nim-lang.org/docs/nimc.html) |
 | nix | [nix-instantiate](http://nixos.org/nix/manual/#sec-nix-instantiate) |
 | nroff | [proselint](http://proselint.com/)|
+| Objective-C | [clang](http://clang.llvm.org/) |
+| Objective-C++ | [clang](http://clang.llvm.org/) |
 | OCaml | [merlin](https://github.com/the-lambda-church/merlin) see `:help ale-integration-ocaml-merlin` for configuration instructions
 | Perl | [perl -c](https://perl.org/), [perl-critic](https://metacpan.org/pod/Perl::Critic) |
 | PHP | [hack](http://hacklang.org/), [php -l](https://secure.php.net/), [phpcs](https://github.com/squizlabs/PHP_CodeSniffer), [phpmd](https://phpmd.org) |
 | Pod | [proselint](http://proselint.com/)|
 | Pug | [pug-lint](https://github.com/pugjs/pug-lint) |
 | Puppet | [puppet](https://puppet.com), [puppet-lint](https://puppet-lint.com) |
-| Python | [flake8](http://flake8.pycqa.org/en/latest/), [mypy](http://mypy-lang.org/), [pylint](https://www.pylint.org/) |
+| Python | [autopep8](https://github.com/hhatto/autopep8), [flake8](http://flake8.pycqa.org/en/latest/), [isort](https://github.com/timothycrosley/isort), [mypy](http://mypy-lang.org/), [pylint](https://www.pylint.org/), [yapf](https://github.com/google/yapf) |
 | ReasonML | [merlin](https://github.com/the-lambda-church/merlin) see `:help ale-integration-reason-merlin` for configuration instructions
 | reStructuredText | [proselint](http://proselint.com/)|
 | RPM spec | [rpmlint](https://github.com/rpm-software-management/rpmlint) (disabled by default; see `:help ale-integration-spec`) |
@@ -110,11 +117,12 @@ name. That seems to be the fairest way to arrange this table.
 | Swift | [swiftlint](https://swift.org/) |
 | Texinfo | [proselint](http://proselint.com/)|
 | Text^ | [proselint](http://proselint.com/), [vale](https://github.com/ValeLint/vale) |
-| TypeScript | [tslint](https://github.com/palantir/tslint), typecheck |
+| TypeScript | [eslint](http://eslint.org/), [tslint](https://github.com/palantir/tslint), tsserver, typecheck |
 | Verilog | [iverilog](https://github.com/steveicarus/iverilog), [verilator](http://www.veripool.org/projects/verilator/wiki/Intro) |
 | Vim | [vint](https://github.com/Kuniwak/vint) |
 | Vim help^ | [proselint](http://proselint.com/)|
 | XHTML | [proselint](http://proselint.com/)|
+| XML | [xmllint](http://xmlsoft.org/xmllint.html/)|
 | YAML | [yamllint](https://yamllint.readthedocs.io/) |
 
 * *^ No linters for text or Vim help filetypes are enabled by default.*
@@ -135,6 +143,9 @@ documented in [the Vim help file](doc/ale.txt). For more information on the
 options ALE offers, consult `:help ale-options` for global options and `:help
 ale-linter-options` for options specified to particular linters.
 
+ALE can fix files with the `ALEFix` command. Functions need to be configured
+for different filetypes with the `g:ale_fixers` variable. See `:help ale-fix`.
+
 <a name="installation"></a>
 
 ## 3. Installation
@@ -287,28 +298,41 @@ highlight clear ALEWarningSign
 
 ### 5.iv. How can I show errors or warnings in my statusline?
 
-You can use `ALEGetStatusLine()` to integrate ALE into vim statusline.
-To enable it, you should have in your `statusline` settings
+[vim-airline](https://github.com/vim-airline/vim-airline) integrates with ALE
+for displaying error information in the status bar. If you want to see the
+status for ALE in a nice format, it is recommended to use vim-airline with ALE.
+The airline extension can be enabled by adding the following to your vimrc:
 
 ```vim
-%{ALEGetStatusLine()}
+" Set this. Airline will handle the rest.
+let g:airline#extensions#ale#enabled = 1
 ```
 
-When errors are detected a string showing the number of errors will be shown.
-You can customize the output format using the global list `g:ale_statusline_format` where:
+If you don't want to use vim-airline, you can implement your own statusline
+function without adding any other plugins. ALE provides a function for counting
+the number of problems for this purpose, named `ale#statusline#Count`.
 
-- The 1st element is for errors
-- The 2nd element is for warnings
-- The 3rd element is for when no errors are detected
-
-e.g
+Say you want to display all errors as one figure, and all non-errors as another
+figure. You can do the following:
 
 ```vim
-let g:ale_statusline_format = ['⨉ %d', '⚠ %d', '⬥ ok']
+function! LinterStatus() abort
+    let l:counts = ale#statusline#Count(bufnr(''))
+
+    let l:all_errors = l:counts.error + l:counts.style_error
+    let l:all_non_errors = l:counts.total - l:all_errors
+
+    return l:counts.total == 0 ? 'OK' : printf(
+    \   '%dW %dE',
+    \   all_non_errors,
+    \   all_errors
+    \)
+endfunction
+
+set statusline=%{LinterStatus()}
 ```
 
-![Statusline with issues](img/issues.png)
-![Statusline with no issues](img/no_issues.png)
+See `:help ale#statusline#Count()` for more information.
 
 <a name="faq-echo-format"></a>
 
@@ -421,7 +445,7 @@ If you configure ALE options correctly in your vimrc file, and install
 the right tools, you can check JSX files with stylelint and eslint.
 
 First, install eslint and install stylelint with
-[https://github.com/styled-components/stylelint-processor-styled-components](stylelint-processor-styled-components).
+[stylelint-processor-styled-components](https://github.com/styled-components/stylelint-processor-styled-components).
 
 Supposing you have installed both tools correctly, configure your .jsx files so
 `jsx` is included in the filetype. You can use an `autocmd` for this.
@@ -469,4 +493,4 @@ still be an advantage.
 
 If you are still concerned, you can turn the automatic linting off altogether,
 including the option `g:ale_lint_on_enter`, and you can run ALE manually with
-`:call ale#Lint()`.
+`:ALELint`.

ale_linters/ansible/ansible-lint.vim

@@ -1,9 +0,0 @@
-" Author: Bjorn Neergaard <bjorn@neersighted.com>
-" Description: ansible-lint for ansible-yaml files
-
-call ale#linter#Define('ansible', {
-\   'name': 'ansible',
-\   'executable': 'ansible',
-\   'command': 'ansible-lint -p %t',
-\   'callback': 'ale#handlers#python#HandlePEP8Format',
-\})

ale_linters/ansible/ansible_lint.vim

@@ -0,0 +1,48 @@
+" Author: Bjorn Neergaard <bjorn@neersighted.com>
+" Description: ansible-lint for ansible-yaml files
+
+function! ale_linters#ansible#ansible_lint#Handle(buffer, lines) abort
+    for l:line in a:lines[:10]
+        if match(l:line, '^Traceback') >= 0
+            return [{
+            \   'lnum': 1,
+            \   'text': 'An exception was thrown. See :ALEDetail',
+            \   'detail': join(a:lines, "\n"),
+            \}]
+        endif
+    endfor
+
+    " Matches patterns line the following:
+    "
+    " test.yml:35: [EANSIBLE0002] Trailing whitespace
+    let l:pattern = '\v^([a-zA-Z]?:?[^:]+):(\d+):?(\d+)?: \[?([[:alnum:]]+)\]? (.*)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        let l:code = l:match[4]
+
+        if (l:code ==# 'EANSIBLE002')
+        \ && !ale#Var(a:buffer, 'warn_about_trailing_whitespace')
+            " Skip warnings for trailing whitespace if the option is off.
+            continue
+        endif
+
+        if ale#path#IsBufferPath(a:buffer, l:match[1])
+            call add(l:output, {
+            \   'lnum': l:match[2] + 0,
+            \   'col': l:match[3] + 0,
+            \   'text': l:code . ': ' . l:match[5],
+            \   'type': l:code[:0] ==# 'E' ? 'E' : 'W',
+            \})
+        endif
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('ansible', {
+\   'name': 'ansible',
+\   'executable': 'ansible',
+\   'command': 'ansible-lint -p %t',
+\   'callback': 'ale_linters#ansible#ansible_lint#Handle',
+\})

ale_linters/asm/gcc.vim

@@ -5,7 +5,7 @@ let g:ale_asm_gcc_options = get(g:, 'ale_asm_gcc_options', '-Wall')
 
 function! ale_linters#asm#gcc#GetCommand(buffer) abort
     return 'gcc -x assembler -fsyntax-only '
-    \    . '-iquote ' . shellescape(fnamemodify(bufname(a:buffer), ':p:h'))
+    \    . '-iquote ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h'))
     \    . ' ' . ale#Var(a:buffer, 'asm_gcc_options') . ' -'
 endfunction
 

ale_linters/awk/gawk.vim

@@ -0,0 +1,26 @@
+" Author: kmarc <korondi.mark@gmail.com>
+" Description: This file adds support for using GNU awk with sripts.
+
+let g:ale_awk_gawk_executable =
+\   get(g:, 'ale_awk_gawk_executable', 'gawk')
+
+let g:ale_awk_gawk_options =
+\   get(g:, 'ale_awk_gawk_options', '')
+
+function! ale_linters#awk#gawk#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'awk_gawk_executable')
+endfunction
+
+function! ale_linters#awk#gawk#GetCommand(buffer) abort
+    return ale_linters#awk#gawk#GetExecutable(a:buffer)
+    \   . ' ' . ale#Var(a:buffer, 'awk_gawk_options')
+    \   . ' ' . '-f %t --lint /dev/null'
+endfunction
+
+call ale#linter#Define('awk', {
+\   'name': 'gawk',
+\   'executable_callback': 'ale_linters#awk#gawk#GetExecutable',
+\   'command_callback': 'ale_linters#awk#gawk#GetCommand',
+\   'callback': 'ale#handlers#cpplint#HandleCppLintFormat',
+\   'output_stream': 'both'
+\})

ale_linters/c/clang.vim

@@ -10,11 +10,14 @@ if !exists('g:ale_c_clang_options')
 endif
 
 function! ale_linters#c#clang#GetCommand(buffer) abort
+    let l:paths = ale#c#FindLocalHeaderPaths(a:buffer)
+
     " -iquote with the directory the file is in makes #include work for
     "  headers in the same directory.
     return 'clang -S -x c -fsyntax-only '
-    \   . '-iquote ' . shellescape(fnamemodify(bufname(a:buffer), ':p:h'))
-    \   . ' ' . ale#Var(a:buffer, 'c_clang_options') . ' -'
+    \   . '-iquote ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h')) . ' '
+    \   . ale#c#IncludeOptions(l:paths)
+    \   . ale#Var(a:buffer, 'c_clang_options') . ' -'
 endfunction
 
 call ale#linter#Define('c', {

ale_linters/c/gcc.vim

@@ -10,11 +10,14 @@ if !exists('g:ale_c_gcc_options')
 endif
 
 function! ale_linters#c#gcc#GetCommand(buffer) abort
+    let l:paths = ale#c#FindLocalHeaderPaths(a:buffer)
+
     " -iquote with the directory the file is in makes #include work for
     "  headers in the same directory.
     return 'gcc -S -x c -fsyntax-only '
-    \   . '-iquote ' . shellescape(fnamemodify(bufname(a:buffer), ':p:h'))
-    \   . ' ' . ale#Var(a:buffer, 'c_gcc_options') . ' -'
+    \   . '-iquote ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h')) . ' '
+    \   . ale#c#IncludeOptions(l:paths)
+    \   . ale#Var(a:buffer, 'c_gcc_options') . ' -'
 endfunction
 
 call ale#linter#Define('c', {

ale_linters/cpp/clang.vim

@@ -7,11 +7,14 @@ if !exists('g:ale_cpp_clang_options')
 endif
 
 function! ale_linters#cpp#clang#GetCommand(buffer) abort
+    let l:paths = ale#c#FindLocalHeaderPaths(a:buffer)
+
     " -iquote with the directory the file is in makes #include work for
     "  headers in the same directory.
     return 'clang++ -S -x c++ -fsyntax-only '
-    \   . '-iquote ' . shellescape(fnamemodify(bufname(a:buffer), ':p:h'))
-    \   . ' ' . ale#Var(a:buffer, 'cpp_clang_options') . ' -'
+    \   . '-iquote ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h')) . ' '
+    \   . ale#c#IncludeOptions(l:paths)
+    \   . ale#Var(a:buffer, 'cpp_clang_options') . ' -'
 endfunction
 
 call ale#linter#Define('cpp', {

ale_linters/cpp/clangcheck.vim

@@ -0,0 +1,37 @@
+" Author: gagbo <gagbobada@gmail.com>
+" Description: clang-check linter for cpp files
+
+" Set this option to manually set some options for clang-check.
+let g:ale_cpp_clangcheck_options = get(g:, 'ale_cpp_clangcheck_options', '')
+
+" Set this option to manually point to the build directory for clang-tidy.
+" This will disable all the other clangtidy_options, since compilation
+" flags are contained in the json
+let g:ale_c_build_dir = get(g:, 'ale_c_build_dir', '')
+
+function! ale_linters#cpp#clangcheck#GetCommand(buffer) abort
+    let l:user_options = ale#Var(a:buffer, 'cpp_clangcheck_options')
+    let l:extra_options = !empty(l:user_options)
+    \   ? l:user_options
+    \   : ''
+
+    " Try to find compilation database to link automatically
+    let l:user_build_dir = ale#Var(a:buffer, 'c_build_dir')
+    if empty(l:user_build_dir)
+        let l:user_build_dir = ale#c#FindCompileCommands(a:buffer)
+    endif
+    let l:build_options = !empty(l:user_build_dir)
+    \   ? ' -p ' . ale#Escape(l:user_build_dir)
+    \   : ''
+
+    return 'clang-check -analyze ' . '%s' . l:extra_options . l:build_options
+endfunction
+
+call ale#linter#Define('cpp', {
+\   'name': 'clangcheck',
+\   'output_stream': 'stderr',
+\   'executable': 'clang-check',
+\   'command_callback': 'ale_linters#cpp#clangcheck#GetCommand',
+\   'callback': 'ale#handlers#gcc#HandleGCCFormat',
+\   'lint_file': 1,
+\})

ale_linters/cpp/clangtidy.vim

@@ -1,4 +1,5 @@
-" Author: vdeurzen <tim@kompiler.org>, w0rp <devw0rp@gmail.com>
+" Author: vdeurzen <tim@kompiler.org>, w0rp <devw0rp@gmail.com>,
+" gagbo <gagbobada@gmail.com>
 " Description: clang-tidy linter for cpp files
 
 " Set this option to check the checks clang-tidy will apply.
@@ -8,15 +9,36 @@ let g:ale_cpp_clangtidy_checks = get(g:, 'ale_cpp_clangtidy_checks', ['*'])
 " This will disable compile_commands.json detection.
 let g:ale_cpp_clangtidy_options = get(g:, 'ale_cpp_clangtidy_options', '')
 
+" Set this option to manually point to the build directory for clang-tidy.
+" This will disable all the other clangtidy_options, since compilation
+" flags are contained in the json
+let g:ale_c_build_dir = get(g:, 'ale_c_build_dir', '')
+
+
 function! ale_linters#cpp#clangtidy#GetCommand(buffer) abort
     let l:check_list = ale#Var(a:buffer, 'cpp_clangtidy_checks')
     let l:check_option = !empty(l:check_list)
-    \   ? '-checks=' . shellescape(join(l:check_list, ',')) . ' '
+    \   ? '-checks=' . ale#Escape(join(l:check_list, ',')) . ' '
     \   : ''
     let l:user_options = ale#Var(a:buffer, 'cpp_clangtidy_options')
-    let l:extra_options = !empty(l:user_options)
-    \   ? ' -- ' . l:user_options
-    \   : ''
+    let l:user_build_dir = ale#Var(a:buffer, 'c_build_dir')
+
+    " c_build_dir has the priority if defined
+    if empty(l:user_build_dir)
+        let l:user_build_dir = ale#c#FindCompileCommands(a:buffer)
+    endif
+
+    " We check again if user_builddir stayed empty after the
+    " c_build_dir_names check
+    " If we found the compilation database we override the value of
+    " l:extra_options
+    if empty(l:user_build_dir)
+        let l:extra_options = !empty(l:user_options)
+        \   ? ' -- ' . l:user_options
+        \   : ''
+    else
+        let l:extra_options = ' -p ' . ale#Escape(l:user_build_dir)
+    endif
 
     return 'clang-tidy ' . l:check_option . '%s' . l:extra_options
 endfunction

ale_linters/cpp/cpplint.vim

@@ -0,0 +1,15 @@
+" Author: Dawid Kurek https://github.com/dawikur
+" Description: cpplint for cpp files
+
+if !exists('g:ale_cpp_cpplint_options')
+    let g:ale_cpp_cpplint_options = ''
+endif
+
+call ale#linter#Define('cpp', {
+\   'name': 'cpplint',
+\   'output_stream': 'stderr',
+\   'executable': 'cpplint',
+\   'command': 'cpplint %s',
+\   'callback': 'ale#handlers#cpplint#HandleCppLintFormat',
+\   'lint_file': 1,
+\})

ale_linters/cpp/gcc.vim

@@ -17,11 +17,14 @@ if !exists('g:ale_cpp_gcc_options')
 endif
 
 function! ale_linters#cpp#gcc#GetCommand(buffer) abort
+    let l:paths = ale#c#FindLocalHeaderPaths(a:buffer)
+
     " -iquote with the directory the file is in makes #include work for
     "  headers in the same directory.
     return 'gcc -S -x c++ -fsyntax-only '
-    \   . '-iquote ' . shellescape(fnamemodify(bufname(a:buffer), ':p:h'))
-    \   . ' ' . ale#Var(a:buffer, 'cpp_gcc_options') . ' -'
+    \   . '-iquote ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h')) . ' '
+    \   . ale#c#IncludeOptions(l:paths)
+    \   . ale#Var(a:buffer, 'cpp_gcc_options') . ' -'
 endfunction
 
 call ale#linter#Define('cpp', {

ale_linters/crystal/crystal.vim

@@ -1,4 +1,4 @@
-" Author: Jordan Andree <https://github.com/jordanandree>
+" Author: Jordan Andree <https://github.com/jordanandree>, David Alexander <opensource@thelonelyghost.com>
 " Description: This file adds support for checking Crystal with crystal build
 
 function! ale_linters#crystal#crystal#Handle(buffer, lines) abort
@@ -24,8 +24,8 @@ function! ale_linters#crystal#crystal#Handle(buffer, lines) abort
 endfunction
 
 function! ale_linters#crystal#crystal#GetCommand(buffer) abort
-    let l:crystal_cmd = 'crystal build -f json --no-codegen -o '
-    let l:crystal_cmd .= shellescape(g:ale#util#nul_file)
+    let l:crystal_cmd = 'crystal build -f json --no-codegen --no-color -o '
+    let l:crystal_cmd .= ale#Escape(g:ale#util#nul_file)
     let l:crystal_cmd .= ' %s'
 
     return l:crystal_cmd

ale_linters/css/csslint.vim

@@ -4,7 +4,7 @@
 function! ale_linters#css#csslint#GetCommand(buffer) abort
     let l:csslintrc = ale#path#FindNearestFile(a:buffer, '.csslintrc')
     let l:config_option = !empty(l:csslintrc)
-    \   ? '--config=' . shellescape(l:csslintrc)
+    \   ? '--config=' . ale#Escape(l:csslintrc)
     \   : ''
 
     return 'csslint --format=compact ' . l:config_option . ' %t'

ale_linters/css/stylelint.vim

@@ -1,24 +1,13 @@
 " Author: diartyz <diartyz@gmail.com>
 
-let g:ale_css_stylelint_executable =
-\   get(g:, 'ale_css_stylelint_executable', 'stylelint')
-
-let g:ale_css_stylelint_options =
-\   get(g:, 'ale_css_stylelint_options', '')
-
-let g:ale_css_stylelint_use_global =
-\   get(g:, 'ale_css_stylelint_use_global', 0)
+call ale#Set('css_stylelint_executable', 'stylelint')
+call ale#Set('css_stylelint_options', '')
+call ale#Set('css_stylelint_use_global', 0)
 
 function! ale_linters#css#stylelint#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'css_stylelint_use_global')
-        return ale#Var(a:buffer, 'css_stylelint_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'css_stylelint', [
     \   'node_modules/.bin/stylelint',
-    \   ale#Var(a:buffer, 'css_stylelint_executable')
-    \)
+    \])
 endfunction
 
 function! ale_linters#css#stylelint#GetCommand(buffer) abort

ale_linters/d/dmd.vim

@@ -31,7 +31,7 @@ function! ale_linters#d#dmd#DUBCommand(buffer) abort
     " To support older dub versions, we just change the directory to
     " the directory where we found the dub config, and then run `dub describe`
     " from that directory.
-    return 'cd ' . shellescape(fnamemodify(l:dub_file, ':h'))
+    return 'cd ' . ale#Escape(fnamemodify(l:dub_file, ':h'))
     \   . ' && dub describe --import-paths'
 endfunction
 
@@ -42,7 +42,7 @@ function! ale_linters#d#dmd#DMDCommand(buffer, dub_output) abort
     for l:line in a:dub_output
         if !empty(l:line)
             " The arguments must be '-Ifilename', not '-I filename'
-            call add(l:import_list, '-I' . shellescape(l:line))
+            call add(l:import_list, '-I' . ale#Escape(l:line))
         endif
     endfor
 

ale_linters/elm/make.vim

@@ -5,6 +5,7 @@ function! ale_linters#elm#make#Handle(buffer, lines) abort
     let l:output = []
     let l:is_windows = has('win32')
     let l:temp_dir = l:is_windows ? $TMP : $TMPDIR
+    let l:unparsed_lines = []
     for l:line in a:lines
         if l:line[0] ==# '['
             let l:errors = json_decode(l:line)
@@ -20,7 +21,6 @@ function! ale_linters#elm#make#Handle(buffer, lines) abort
 
                 if l:file_is_buffer
                     call add(l:output, {
-                    \    'bufnr': a:buffer,
                     \    'lnum': l:error.region.start.line,
                     \    'col': l:error.region.start.column,
                     \    'type': (l:error.type ==? 'error') ? 'E' : 'W',
@@ -29,9 +29,20 @@ function! ale_linters#elm#make#Handle(buffer, lines) abort
                     \})
                 endif
             endfor
+        elseif l:line !=# 'Successfully generated /dev/null'
+            call add(l:unparsed_lines, l:line)
         endif
     endfor
 
+    if len(l:unparsed_lines) > 0
+        call add(l:output, {
+        \    'lnum': 1,
+        \    'type': 'E',
+        \    'text': l:unparsed_lines[0],
+        \    'detail': join(l:unparsed_lines, "\n")
+        \})
+    endif
+
     return l:output
 endfunction
 
@@ -43,14 +54,14 @@ function! ale_linters#elm#make#GetCommand(buffer) abort
         let l:dir_set_cmd = ''
     else
         let l:root_dir = fnamemodify(l:elm_package, ':p:h')
-        let l:dir_set_cmd = 'cd ' . shellescape(l:root_dir) . ' && '
+        let l:dir_set_cmd = 'cd ' . ale#Escape(l:root_dir) . ' && '
     endif
 
     " The elm-make compiler, at the time of this writing, uses '/dev/null' as
     " a sort of flag to tell the compiler not to generate an output file,
     " which is why this is hard coded here.
     " Source: https://github.com/elm-lang/elm-make/blob/master/src/Flags.hs
-    let l:elm_cmd = 'elm-make --report=json --output='.shellescape('/dev/null')
+    let l:elm_cmd = 'elm-make --report=json --output='.ale#Escape('/dev/null')
 
     return l:dir_set_cmd . ' ' . l:elm_cmd . ' %t'
 endfunction

ale_linters/erlang/erlc.vim

@@ -6,7 +6,7 @@ function! ale_linters#erlang#erlc#GetCommand(buffer) abort
     let l:output_file = tempname()
     call ale#engine#ManageFile(a:buffer, l:output_file)
 
-    return 'erlc -o ' . shellescape(l:output_file)
+    return 'erlc -o ' . ale#Escape(l:output_file)
     \   . ' ' . ale#Var(a:buffer, 'erlang_erlc_options')
     \   . ' %t'
 endfunction

ale_linters/fuse/fusionlint.vim

@@ -0,0 +1,41 @@
+" Author: RyanSquared <vandor2012@gmail.com>
+" Description: `fusion-lint` linter for FusionScript files
+
+let g:ale_fuse_fusionlint_executable =
+\   get(g:, 'ale_fuse_fusionlint_executable', 'fusion-lint')
+
+let g:ale_fuse_fusionlint_options =
+\   get(g:, 'ale_fuse_fusionlint_options', '')
+
+function! ale_linters#fuse#fusionlint#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'fuse_fusionlint_executable')
+endfunction
+
+function! ale_linters#fuse#fusionlint#GetCommand(buffer) abort
+    return ale#Escape(ale_linters#fuse#fusionlint#GetExecutable(a:buffer))
+    \   . ' ' . ale#Var(a:buffer, 'fuse_fusionlint_options')
+    \   . ' --filename %s -i'
+endfunction
+
+function! ale_linters#fuse#fusionlint#Handle(buffer, lines) abort
+    let l:pattern = '^.*:\(\d\+\):\(\d\+\): (\([WE]\)\d\+) \(.\+\)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        call add(l:output, {
+        \   'lnum': l:match[1] + 0,
+        \   'col': l:match[2] + 0,
+        \   'text': l:match[4],
+        \   'type': l:match[3],
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('fuse', {
+\   'name': 'fusionlint',
+\   'executable_callback': 'ale_linters#fuse#fusionlint#GetExecutable',
+\   'command_callback': 'ale_linters#fuse#fusionlint#GetCommand',
+\   'callback': 'ale_linters#fuse#fusionlint#Handle',
+\})

ale_linters/go/gometalinter.vim

@@ -6,9 +6,11 @@ if !exists('g:ale_go_gometalinter_options')
 endif
 
 function! ale_linters#go#gometalinter#GetCommand(buffer) abort
-    return 'gometalinter '
+    let l:filename = expand('#' . a:buffer . ':p')
+
+    return 'gometalinter --include=''^' . l:filename . '.*$'' '
     \   . ale#Var(a:buffer, 'go_gometalinter_options')
-    \   . ' ' . shellescape(fnamemodify(bufname(a:buffer), ':p:h'))
+    \   . ' ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h'))
 endfunction
 
 function! ale_linters#go#gometalinter#GetMatches(lines) abort
@@ -21,11 +23,6 @@ function! ale_linters#go#gometalinter#Handler(buffer, lines) abort
     let l:output = []
 
     for l:match in ale_linters#go#gometalinter#GetMatches(a:lines)
-        " Omit errors from files other than the one currently open
-        if !ale#path#IsBufferPath(a:buffer, l:match[1])
-            continue
-        endif
-
         call add(l:output, {
         \   'lnum': l:match[2] + 0,
         \   'col': l:match[3] + 0,

ale_linters/handlebars/embertemplatelint.vim

@@ -1,22 +1,13 @@
 " Author: Adrian Zalewski <aazalewski@hotmail.com>
 " Description: Ember-template-lint for checking Handlebars files
 
-let g:ale_handlebars_embertemplatelint_executable =
-\   get(g:, 'ale_handlebars_embertemplatelint_executable', 'ember-template-lint')
-
-let g:ale_handlebars_embertemplatelint_use_global =
-\   get(g:, 'ale_handlebars_embertemplatelint_use_global', 0)
+call ale#Set('handlebars_embertemplatelint_executable', 'ember-template-lint')
+call ale#Set('handlebars_embertemplatelint_use_global', 0)
 
 function! ale_linters#handlebars#embertemplatelint#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'handlebars_embertemplatelint_use_global')
-        return ale#Var(a:buffer, 'handlebars_embertemplatelint_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'handlebars_embertemplatelint', [
     \   'node_modules/.bin/ember-template-lint',
-    \   ale#Var(a:buffer, 'handlebars_embertemplatelint_executable')
-    \)
+    \])
 endfunction
 
 function! ale_linters#handlebars#embertemplatelint#GetCommand(buffer) abort

ale_linters/haskell/ghc-mod.vim

@@ -0,0 +1,16 @@
+" Author: wizzup <wizzup@gmail.com>
+" Description: ghc-mod for Haskell files
+
+call ale#linter#Define('haskell', {
+\   'name': 'ghc-mod',
+\   'executable': 'ghc-mod',
+\   'command': 'ghc-mod check %t',
+\   'callback': 'ale#handlers#haskell#HandleGHCFormat',
+\})
+
+call ale#linter#Define('haskell', {
+\   'name': 'stack-ghc-mod',
+\   'executable': 'stack',
+\   'command': 'stack exec ghc-mod check %t',
+\   'callback': 'ale#handlers#haskell#HandleGHCFormat',
+\})

ale_linters/html/htmlhint.vim

@@ -1,21 +1,14 @@
 " Author: KabbAmine <amine.kabb@gmail.com>, deathmaz <00maz1987@gmail.com>, diartyz <diartyz@gmail.com>
 " Description: HTMLHint for checking html files
 
-" CLI options
-let g:ale_html_htmlhint_options = get(g:, 'ale_html_htmlhint_options', '--format=unix')
-let g:ale_html_htmlhint_executable = get(g:, 'ale_html_htmlhint_executable', 'htmlhint')
-let g:ale_html_htmlhint_use_global = get(g:, 'ale_html_htmlhint_use_global', 0)
+call ale#Set('html_htmlhint_options', '--format=unix')
+call ale#Set('html_htmlhint_executable', 'htmlhint')
+call ale#Set('html_htmlhint_use_global', 0)
 
 function! ale_linters#html#htmlhint#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'html_htmlhint_use_global')
-        return ale#Var(a:buffer, 'html_htmlhint_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'html_htmlhint', [
     \   'node_modules/.bin/htmlhint',
-    \   ale#Var(a:buffer, 'html_htmlhint_executable')
-    \)
+    \])
 endfunction
 
 function! ale_linters#html#htmlhint#GetCommand(buffer) abort

ale_linters/java/checkstyle.vim

@@ -0,0 +1,46 @@
+" Author: Devon Meunier <devon.meunier@gmail.com>
+" Description: checkstyle for Java files
+
+function! ale_linters#java#checkstyle#Handle(buffer, lines) abort
+    let l:patterns = [
+        \ '\v\[(WARN|ERROR)\] .*:(\d+):(\d+): (.*)',
+        \ '\v\[(WARN|ERROR)\] .*:(\d+): (.*)',
+        \]
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:patterns)
+        let l:args = {
+        \   'lnum': l:match[2] + 0,
+        \   'type': l:match[1] =~? 'WARN' ? 'W' : 'E'
+        \ }
+
+        let l:col = l:match[3] + 0
+        if l:col > 0
+            let l:args['col'] = l:col
+            let l:args['text'] = l:match[4]
+        else
+            let l:args['text'] = l:match[3]
+        endif
+
+        call add(l:output, l:args)
+    endfor
+
+    return l:output
+endfunction
+
+function! ale_linters#java#checkstyle#GetCommand(buffer) abort
+    return 'checkstyle '
+    \ . ale#Var(a:buffer, 'java_checkstyle_options')
+    \ . ' %t'
+endfunction
+
+if !exists('g:ale_java_checkstyle_options')
+    let g:ale_java_checkstyle_options = '-c /google_checks.xml'
+endif
+
+call ale#linter#Define('java', {
+\   'name': 'checkstyle',
+\   'executable': 'checkstyle',
+\   'command_callback': 'ale_linters#java#checkstyle#GetCommand',
+\   'callback': 'ale_linters#java#checkstyle#Handle',
+\})

ale_linters/java/javac.vim

@@ -6,27 +6,6 @@ let s:classpath_sep = has('unix') ? ':' : ';'
 let g:ale_java_javac_options = get(g:, 'ale_java_javac_options', '')
 let g:ale_java_javac_classpath = get(g:, 'ale_java_javac_classpath', '')
 
-" Detect if the javac command just shows an annoying popup for Mac OSX.
-if has('macunix')
-    function s:GetIsJavacAnAppStoreStub() abort
-        let l:path = resolve(systemlist('which javac')[0])
-
-        for l:line in readfile(l:path)
-            " This string is present inside the executable for the popup.
-            if l:line =~? 'No Java runtime present'
-                return 1
-            endif
-        endfor
-
-        return 0
-    endfunction
-
-    let s:is_javac_an_app_store_stub = s:GetIsJavacAnAppStoreStub()
-    delfunction s:GetIsJavacAnAppStoreStub
-else
-    let s:is_javac_an_app_store_stub = 0
-endif
-
 function! ale_linters#java#javac#GetImportPaths(buffer) abort
     let l:pom_path = ale#path#FindNearestFile(a:buffer, 'pom.xml')
 
@@ -47,16 +26,11 @@ function! s:BuildClassPathOption(buffer, import_paths) abort
     \)
 
     return !empty(l:class_paths)
-    \   ? '-cp ' . shellescape(join(l:class_paths, s:classpath_sep))
+    \   ? '-cp ' . ale#Escape(join(l:class_paths, s:classpath_sep))
     \   : ''
 endfunction
 
 function! ale_linters#java#javac#GetCommand(buffer, import_paths) abort
-    " If running the command will just show a popup, then don't run it.
-    if s:is_javac_an_app_store_stub
-        return ''
-    endif
-
     let l:cp_option = s:BuildClassPathOption(a:buffer, a:import_paths)
     let l:sp_option = ''
 
@@ -64,7 +38,7 @@ function! ale_linters#java#javac#GetCommand(buffer, import_paths) abort
     let l:src_dir = ale#path#FindNearestDirectory(a:buffer, 'src/main/java')
 
     if !empty(l:src_dir)
-        let l:sp_option = '-sourcepath ' . shellescape(l:src_dir)
+        let l:sp_option = '-sourcepath ' . ale#Escape(l:src_dir)
     endif
 
     " Create .class files in a temporary directory, which we will delete later.
@@ -73,7 +47,7 @@ function! ale_linters#java#javac#GetCommand(buffer, import_paths) abort
     return 'javac -Xlint'
     \ . ' ' . l:cp_option
     \ . ' ' . l:sp_option
-    \ . ' -d ' . shellescape(l:class_file_directory)
+    \ . ' -d ' . ale#Escape(l:class_file_directory)
     \ . ' ' . ale#Var(a:buffer, 'java_javac_options')
     \ . ' %t'
 endfunction
@@ -85,11 +59,14 @@ function! ale_linters#java#javac#Handle(buffer, lines) abort
     " Main.java:16: error: ';' expected
 
     let l:pattern = '\v^.*:(\d+): (.+):(.+)$'
+    let l:col_pattern = '\v^(\s*\^)$'
     let l:symbol_pattern = '\v^ +symbol: *(class|method) +([^ ]+)'
     let l:output = []
 
-    for l:match in ale#util#GetMatches(a:lines, [l:pattern, l:symbol_pattern])
-        if empty(l:match[3])
+    for l:match in ale#util#GetMatches(a:lines, [l:pattern, l:col_pattern, l:symbol_pattern])
+        if empty(l:match[2]) && empty(l:match[3])
+                let l:output[-1].col = len(l:match[1])
+        elseif empty(l:match[3])
             " Add symbols to 'cannot find symbol' errors.
             if l:output[-1].text ==# 'error: cannot find symbol'
                 let l:output[-1].text .= ': ' . l:match[2]

ale_linters/javascript/eslint.vim

@@ -1,97 +1,9 @@
 " Author: w0rp <devw0rp@gmail.com>
 " Description: eslint for JavaScript files
 
-let g:ale_javascript_eslint_executable =
-\   get(g:, 'ale_javascript_eslint_executable', 'eslint')
-
-let g:ale_javascript_eslint_options =
-\   get(g:, 'ale_javascript_eslint_options', '')
-
-let g:ale_javascript_eslint_use_global =
-\   get(g:, 'ale_javascript_eslint_use_global', 0)
-
-function! ale_linters#javascript#eslint#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'javascript_eslint_use_global')
-        return ale#Var(a:buffer, 'javascript_eslint_executable')
-    endif
-
-    " Look for the kinds of paths that create-react-app generates first.
-    let l:executable = ale#path#ResolveLocalPath(
-    \   a:buffer,
-    \   'node_modules/eslint/bin/eslint.js',
-    \   ''
-    \)
-
-    if !empty(l:executable)
-        return l:executable
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
-    \   'node_modules/.bin/eslint',
-    \   ale#Var(a:buffer, 'javascript_eslint_executable')
-    \)
-endfunction
-
-function! ale_linters#javascript#eslint#GetCommand(buffer) abort
-    return shellescape(ale_linters#javascript#eslint#GetExecutable(a:buffer))
-    \   . ' ' . ale#Var(a:buffer, 'javascript_eslint_options')
-    \   . ' -f unix --stdin --stdin-filename %s'
-endfunction
-
-function! ale_linters#javascript#eslint#Handle(buffer, lines) abort
-    let l:config_error_pattern = '\v^ESLint couldn''t find a configuration file'
-    \   . '|^Cannot read config file'
-    \   . '|^.*Configuration for rule .* is invalid'
-
-    " Look for a message in the first few lines which indicates that
-    " a configuration file couldn't be found.
-    for l:line in a:lines[:10]
-        if len(matchlist(l:line, l:config_error_pattern)) > 0
-            return [{
-            \   'lnum': 1,
-            \   'text': 'eslint configuration error (type :ALEDetail for more information)',
-            \   'detail': join(a:lines, "\n"),
-            \}]
-        endif
-    endfor
-
-    " Matches patterns line the following:
-    "
-    " /path/to/some-filename.js:47:14: Missing trailing comma. [Warning/comma-dangle]
-    " /path/to/some-filename.js:56:41: Missing semicolon. [Error/semi]
-    let l:pattern = '^.*:\(\d\+\):\(\d\+\): \(.\+\) \[\(.\+\)\]$'
-    " This second pattern matches lines like the following:
-    "
-    " /path/to/some-filename.js:13:3: Parsing error: Unexpected token
-    let l:parsing_pattern = '^.*:\(\d\+\):\(\d\+\): \(.\+\)$'
-    let l:output = []
-
-    for l:match in ale#util#GetMatches(a:lines, [l:pattern, l:parsing_pattern])
-        let l:type = 'Error'
-        let l:text = l:match[3]
-
-        " Take the error type from the output if available.
-        if !empty(l:match[4])
-            let l:type = split(l:match[4], '/')[0]
-            let l:text .= ' [' . l:match[4] . ']'
-        endif
-
-        call add(l:output, {
-        \   'bufnr': a:buffer,
-        \   'lnum': l:match[1] + 0,
-        \   'col': l:match[2] + 0,
-        \   'text': l:text,
-        \   'type': l:type ==# 'Warning' ? 'W' : 'E',
-        \})
-    endfor
-
-    return l:output
-endfunction
-
 call ale#linter#Define('javascript', {
 \   'name': 'eslint',
-\   'executable_callback': 'ale_linters#javascript#eslint#GetExecutable',
-\   'command_callback': 'ale_linters#javascript#eslint#GetCommand',
-\   'callback': 'ale_linters#javascript#eslint#Handle',
+\   'executable_callback': 'ale#handlers#eslint#GetExecutable',
+\   'command_callback': 'ale#handlers#eslint#GetCommand',
+\   'callback': 'ale#handlers#eslint#Handle',
 \})

ale_linters/javascript/flow.vim

@@ -1,25 +1,21 @@
 " Author: Zach Perrault -- @zperrault
 " Description: FlowType checking for JavaScript files
 
-let g:ale_javascript_flow_executable =
-\   get(g:, 'ale_javascript_flow_executable', 'flow')
-
-let g:ale_javascript_flow_use_global =
-\   get(g:, 'ale_javascript_flow_use_global', 0)
+call ale#Set('javascript_flow_executable', 'flow')
+call ale#Set('javascript_flow_use_global', 0)
 
 function! ale_linters#javascript#flow#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'javascript_flow_use_global')
-        return ale#Var(a:buffer, 'javascript_flow_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'javascript_flow', [
     \   'node_modules/.bin/flow',
-    \   ale#Var(a:buffer, 'javascript_flow_executable')
-    \)
+    \])
 endfunction
 
-function! ale_linters#javascript#flow#GetCommand(buffer) abort
+function! ale_linters#javascript#flow#VersionCheck(buffer) abort
+    return ale#Escape(ale_linters#javascript#flow#GetExecutable(a:buffer))
+    \   . ' --version'
+endfunction
+
+function! ale_linters#javascript#flow#GetCommand(buffer, version_lines) abort
     let l:flow_config = ale#path#FindNearestFile(a:buffer, '.flowconfig')
 
     if empty(l:flow_config)
@@ -27,8 +23,21 @@ function! ale_linters#javascript#flow#GetCommand(buffer) abort
         return ''
     endif
 
-    return shellescape(ale_linters#javascript#flow#GetExecutable(a:buffer))
-    \   . ' check-contents --respect-pragma --json --from ale %s'
+    let l:use_respect_pragma = 1
+
+    " If we can parse the version number, then only use --respect-pragma
+    " if the version is >= 0.36.0, which added the argument.
+    for l:match in ale#util#GetMatches(a:version_lines, '\v\d+\.\d+\.\d+$')
+        let l:use_respect_pragma = ale#semver#GreaterOrEqual(
+        \   ale#semver#Parse(l:match[0]),
+        \   [0, 36, 0]
+        \)
+    endfor
+
+    return ale#Escape(ale_linters#javascript#flow#GetExecutable(a:buffer))
+    \   . ' check-contents'
+    \   . (l:use_respect_pragma ? ' --respect-pragma': '')
+    \   . ' --json --from ale %s'
 endfunction
 
 function! ale_linters#javascript#flow#Handle(buffer, lines) abort
@@ -51,7 +60,9 @@ function! ale_linters#javascript#flow#Handle(buffer, lines) abort
             " Comments have no line of column information, so we skip them.
             " In certain cases, `l:message.loc.source` points to a different path
             " than the buffer one, thus we skip this loc information too.
-            if has_key(l:message, 'loc') && l:line ==# 0 && l:message.loc.source ==# expand('#' . a:buffer . ':p')
+            if has_key(l:message, 'loc')
+            \&& l:line ==# 0
+            \&& ale#path#IsBufferPath(a:buffer, l:message.loc.source)
                 let l:line = l:message.loc.start.line + 0
                 let l:col = l:message.loc.start.column + 0
             endif
@@ -81,6 +92,10 @@ endfunction
 call ale#linter#Define('javascript', {
 \   'name': 'flow',
 \   'executable_callback': 'ale_linters#javascript#flow#GetExecutable',
-\   'command_callback': 'ale_linters#javascript#flow#GetCommand',
+\   'command_chain': [
+\       {'callback': 'ale_linters#javascript#flow#VersionCheck'},
+\       {'callback': 'ale_linters#javascript#flow#GetCommand'},
+\   ],
 \   'callback': 'ale_linters#javascript#flow#Handle',
+\   'add_newline': 1,
 \})

ale_linters/javascript/jshint.vim

@@ -1,22 +1,13 @@
 " Author: Chris Kyrouac - https://github.com/fijshion
 " Description: JSHint for Javascript files
 
-let g:ale_javascript_jshint_executable =
-\   get(g:, 'ale_javascript_jshint_executable', 'jshint')
-
-let g:ale_javascript_jshint_use_global =
-\   get(g:, 'ale_javascript_jshint_use_global', 0)
+call ale#Set('javascript_jshint_executable', 'jshint')
+call ale#Set('javascript_jshint_use_global', 0)
 
 function! ale_linters#javascript#jshint#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'javascript_jshint_use_global')
-        return ale#Var(a:buffer, 'javascript_jshint_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'javascript_jshint', [
     \   'node_modules/.bin/jshint',
-    \   ale#Var(a:buffer, 'javascript_jshint_executable')
-    \)
+    \])
 endfunction
 
 function! ale_linters#javascript#jshint#GetCommand(buffer) abort
@@ -27,11 +18,11 @@ function! ale_linters#javascript#jshint#GetCommand(buffer) abort
     \   get(g:, 'ale_jshint_config_loc', '')
     \)
 
-    let l:command = shellescape(ale_linters#javascript#jshint#GetExecutable(a:buffer))
+    let l:command = ale#Escape(ale_linters#javascript#jshint#GetExecutable(a:buffer))
     let l:command .= ' --reporter unix --extract auto'
 
     if !empty(l:jshint_config)
-        let l:command .= ' --config ' . shellescape(l:jshint_config)
+        let l:command .= ' --config ' . ale#Escape(l:jshint_config)
     endif
 
     let l:command .= ' -'

ale_linters/javascript/standard.vim

@@ -1,62 +1,26 @@
 " Author: Ahmed El Gabri <@ahmedelgabri>
 " Description: standardjs for JavaScript files
 
-let g:ale_javascript_standard_executable =
-\   get(g:, 'ale_javascript_standard_executable', 'standard')
-
-let g:ale_javascript_standard_options =
-\   get(g:, 'ale_javascript_standard_options', '')
-
-let g:ale_javascript_standard_use_global =
-\   get(g:, 'ale_javascript_standard_use_global', 0)
+call ale#Set('javascript_standard_executable', 'standard')
+call ale#Set('javascript_standard_use_global', 0)
+call ale#Set('javascript_standard_options', '')
 
 function! ale_linters#javascript#standard#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'javascript_standard_use_global')
-        return ale#Var(a:buffer, 'javascript_standard_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'javascript_standard', [
     \   'node_modules/.bin/standard',
-    \   ale#Var(a:buffer, 'javascript_standard_executable')
-    \)
+    \])
 endfunction
 
 function! ale_linters#javascript#standard#GetCommand(buffer) abort
-    return shellescape(ale_linters#javascript#standard#GetExecutable(a:buffer))
+    return ale#Escape(ale_linters#javascript#standard#GetExecutable(a:buffer))
     \   . ' ' . ale#Var(a:buffer, 'javascript_standard_options')
     \   . ' --stdin %s'
 endfunction
 
-function! ale_linters#javascript#standard#Handle(buffer, lines) abort
-    " Matches patterns line the following:
-    "
-    " /path/to/some-filename.js:47:14: Strings must use singlequote.
-    " /path/to/some-filename.js:56:41: Expected indentation of 2 spaces but found 4.
-    " /path/to/some-filename.js:13:3: Parsing error: Unexpected token
-    let l:pattern = '^.*:\(\d\+\):\(\d\+\): \(.\+\)$'
-    let l:output = []
-
-    for l:match in ale#util#GetMatches(a:lines, l:pattern)
-        let l:type = 'Error'
-        let l:text = l:match[3]
-
-        call add(l:output, {
-        \   'bufnr': a:buffer,
-        \   'lnum': l:match[1] + 0,
-        \   'col': l:match[2] + 0,
-        \   'text': l:text,
-        \   'type': 'E',
-        \})
-    endfor
-
-    return l:output
-endfunction
-
+" standard uses eslint and the output format is the same
 call ale#linter#Define('javascript', {
 \   'name': 'standard',
 \   'executable_callback': 'ale_linters#javascript#standard#GetExecutable',
 \   'command_callback': 'ale_linters#javascript#standard#GetCommand',
-\   'callback': 'ale_linters#javascript#standard#Handle',
+\   'callback': 'ale#handlers#eslint#Handle',
 \})
-

ale_linters/javascript/xo.vim

@@ -1,41 +1,26 @@
 " Author: Daniel Lupu <lupu.daniel.f@gmail.com>
 " Description: xo for JavaScript files
 
-let g:ale_javascript_xo_executable =
-\   get(g:, 'ale_javascript_xo_executable', 'xo')
-
-let g:ale_javascript_xo_options =
-\   get(g:, 'ale_javascript_xo_options', '')
-
-let g:ale_javascript_xo_use_global =
-\   get(g:, 'ale_javascript_xo_use_global', 0)
+call ale#Set('javascript_xo_executable', 'xo')
+call ale#Set('javascript_xo_use_global', 0)
+call ale#Set('javascript_xo_options', '')
 
 function! ale_linters#javascript#xo#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'javascript_xo_use_global')
-        return ale#Var(a:buffer, 'javascript_xo_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'javascript_xo', [
     \   'node_modules/.bin/xo',
-    \   ale#Var(a:buffer, 'javascript_xo_executable')
-    \)
+    \])
 endfunction
 
 function! ale_linters#javascript#xo#GetCommand(buffer) abort
-    return shellescape(ale_linters#javascript#xo#GetExecutable(a:buffer))
+    return ale#Escape(ale_linters#javascript#xo#GetExecutable(a:buffer))
     \   . ' ' . ale#Var(a:buffer, 'javascript_xo_options')
     \   . ' --reporter unix --stdin --stdin-filename %s'
 endfunction
 
-function! ale_linters#javascript#xo#Handle(buffer, lines) abort
-    " xo uses eslint and the output format is the same
-    return ale_linters#javascript#eslint#Handle(a:buffer, a:lines)
-endfunction
-
+" xo uses eslint and the output format is the same
 call ale#linter#Define('javascript', {
 \   'name': 'xo',
 \   'executable_callback': 'ale_linters#javascript#xo#GetExecutable',
 \   'command_callback': 'ale_linters#javascript#xo#GetCommand',
-\   'callback': 'ale_linters#javascript#xo#Handle',
+\   'callback': 'ale#handlers#eslint#Handle',
 \})

ale_linters/kotlin/kotlinc.vim

@@ -9,20 +9,53 @@ let g:ale_kotlin_kotlinc_sourcepath = get(g:, 'ale_kotlin_kotlinc_sourcepath', '
 let g:ale_kotlin_kotlinc_use_module_file = get(g:, 'ale_kotlin_kotlinc_use_module_file', 0)
 let g:ale_kotlin_kotlinc_module_filename = get(g:, 'ale_kotlin_kotlinc_module_filename', 'module.xml')
 
-function! ale_linters#kotlin#kotlinc#GetCommand(buffer) abort
+let s:classpath_sep = has('unix') ? ':' : ';'
+
+function! ale_linters#kotlin#kotlinc#GetImportPaths(buffer) abort
+    " exec maven only if classpath is not set
+    if ale#Var(a:buffer, 'kotlin_kotlinc_classpath') !=# ''
+        return ''
+    else
+        let l:pom_path = ale#path#FindNearestFile(a:buffer, 'pom.xml')
+
+        if !empty(l:pom_path) && executable('mvn')
+            return ale#path#CdString(fnamemodify(l:pom_path, ':h'))
+                        \ . 'mvn dependency:build-classpath'
+        endif
+
+        return ''
+    endif
+endfunction
+
+function! s:BuildClassPathOption(buffer, import_paths) abort
+    " Filter out lines like [INFO], etc.
+    let l:class_paths = filter(a:import_paths[:], 'v:val !~# ''[''')
+    call extend(
+    \   l:class_paths,
+    \   split(ale#Var(a:buffer, 'kotlin_kotlinc_classpath'), s:classpath_sep),
+    \)
+
+    return !empty(l:class_paths)
+    \   ? ' -cp ' . ale#Escape(join(l:class_paths, s:classpath_sep))
+    \   : ''
+endfunction
+
+function! ale_linters#kotlin#kotlinc#GetCommand(buffer, import_paths) abort
     let l:kotlinc_opts = ale#Var(a:buffer, 'kotlin_kotlinc_options')
     let l:command = 'kotlinc '
 
     " If the config file is enabled and readable, source it
     if ale#Var(a:buffer, 'kotlin_kotlinc_enable_config')
-        if filereadable(expand(ale#Var(a:buffer, 'kotlin_kotlinc_config_file'), 1))
-            execute 'source ' . shellescape(expand(ale#Var(a:buffer, 'kotlin_kotlinc_config_file'), 1))
+        let l:conf = expand(ale#Var(a:buffer, 'kotlin_kotlinc_config_file'), 1)
+
+        if filereadable(l:conf)
+            execute 'source ' . fnameescape(l:conf)
         endif
     endif
 
     " If use module and module file is readable use that and return
     if ale#Var(a:buffer, 'kotlin_kotlinc_use_module_file')
-        let l:module_filename = shellescape(expand(ale#Var(a:buffer, 'kotlin_kotlinc_module_filename'), 1))
+        let l:module_filename = ale#Escape(expand(ale#Var(a:buffer, 'kotlin_kotlinc_module_filename'), 1))
 
         if filereadable(l:module_filename)
             let l:kotlinc_opts .= ' -module ' . l:module_filename
@@ -35,14 +68,20 @@ function! ale_linters#kotlin#kotlinc#GetCommand(buffer) abort
     " We only get here if not using module or the module file not readable
     if ale#Var(a:buffer, 'kotlin_kotlinc_classpath') !=# ''
         let l:kotlinc_opts .= ' -cp ' . ale#Var(a:buffer, 'kotlin_kotlinc_classpath')
+    else
+        " get classpath from maven
+        let l:kotlinc_opts .= s:BuildClassPathOption(a:buffer, a:import_paths)
     endif
 
     let l:fname = ''
-
     if ale#Var(a:buffer, 'kotlin_kotlinc_sourcepath') !=# ''
         let l:fname .= expand(ale#Var(a:buffer, 'kotlin_kotlinc_sourcepath'), 1) . ' '
+    else
+        " Find the src directory for files in this project.
+        let l:src_dir = ale#path#FindNearestDirectory(a:buffer, 'src/main/java')
+        let l:fname .= expand(l:src_dir, 1) . ' '
     endif
-    let l:fname .= shellescape(expand('#' . a:buffer . ':p'))
+    let l:fname .= ale#Escape(expand('#' . a:buffer . ':p'))
     let l:command .= l:kotlinc_opts . ' ' . l:fname
 
     return l:command
@@ -97,7 +136,7 @@ function! ale_linters#kotlin#kotlinc#Handle(buffer, lines) abort
         let l:type_marker_str = l:type ==# 'warning' || l:type ==# 'info' ? 'W' : 'E'
 
         call add(l:output, {
-        \   'lnum': -1,
+        \   'lnum': 1,
         \   'text': l:text,
         \   'type': l:type_marker_str,
         \})
@@ -108,9 +147,11 @@ endfunction
 
 call ale#linter#Define('kotlin', {
 \   'name': 'kotlinc',
-\   'output_stream': 'stderr',
 \   'executable': 'kotlinc',
-\   'command_callback': 'ale_linters#kotlin#kotlinc#GetCommand',
+\   'command_chain': [
+\       {'callback': 'ale_linters#kotlin#kotlinc#GetImportPaths', 'output_stream': 'stdout'},
+\       {'callback': 'ale_linters#kotlin#kotlinc#GetCommand', 'output_stream': 'stderr'},
+\   ],
 \   'callback': 'ale_linters#kotlin#kotlinc#Handle',
 \   'lint_file': 1,
 \})

ale_linters/kotlin/ktlint.vim

@@ -0,0 +1,54 @@
+" Author: Francis Agyapong <francisagyapong2@gmail.com>
+" Description: Lint kotlin files using ktlint
+
+call ale#Set('kotlin_ktlint_executable', 'ktlint')
+call ale#Set('kotlin_ktlint_rulesets', [])
+call ale#Set('kotlin_ktlint_format', 0)
+
+
+function! ale_linters#kotlin#ktlint#GetCommand(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'kotlin_ktlint_executable')
+    let l:file_path = expand('#' . a:buffer . ':p')
+    let l:options = ''
+
+    " Formmatted content written to original file, not sure how to handle
+    " if ale#Var(a:buffer, 'kotlin_ktlint_format')
+    "     let l:options = l:options . ' --format'
+    " endif
+
+    for l:ruleset in ale#Var(a:buffer, 'kotlin_ktlint_rulesets')
+        let l:options = l:options . ' --ruleset ' . l:ruleset
+    endfor
+
+    return l:executable . ' ' . l:options . ' ' . l:file_path
+endfunction
+
+function! ale_linters#kotlin#ktlint#Handle(buffer, lines) abort
+    let l:message_pattern = '^\(.*\):\([0-9]\+\):\([0-9]\+\):\s\+\(.*\)'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:message_pattern)
+        let l:line = l:match[2] + 0
+        let l:column = l:match[3] + 0
+        let l:text = l:match[4]
+
+        let l:type = l:text =~? 'not a valid kotlin file' ? 'E' : 'W'
+
+        call add(l:output, {
+        \   'lnum': l:line,
+        \   'col': l:column,
+        \   'text': l:text,
+        \   'type': l:type
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('kotlin', {
+\   'name': 'ktlint',
+\   'executable': 'ktlint',
+\   'command_callback': 'ale_linters#kotlin#ktlint#GetCommand',
+\   'callback': 'ale_linters#kotlin#ktlint#Handle',
+\   'lint_file': 1
+\})

ale_linters/lua/luacheck.vim

@@ -12,7 +12,7 @@ function! ale_linters#lua#luacheck#GetExecutable(buffer) abort
 endfunction
 
 function! ale_linters#lua#luacheck#GetCommand(buffer) abort
-    return shellescape(ale_linters#lua#luacheck#GetExecutable(a:buffer))
+    return ale#Escape(ale_linters#lua#luacheck#GetExecutable(a:buffer))
     \   . ' ' . ale#Var(a:buffer, 'lua_luacheck_options')
     \   . ' --formatter plain --codes --filename %s -'
 endfunction

ale_linters/nim/nimcheck.vim

@@ -44,10 +44,7 @@ endfunction
 
 
 function! ale_linters#nim#nimcheck#GetCommand(buffer) abort
-    let l:directory = shellescape(fnamemodify(bufname(a:buffer), ':p:h'))
-
-    return 'nim check --path:' . l:directory
-    \   . ' --threads:on --verbosity:0 --colors:off --listFullPaths %t'
+    return 'nim check --verbosity:0 --colors:off --listFullPaths %s'
 endfunction
 
 
@@ -56,5 +53,6 @@ call ale#linter#Define('nim', {
 \    'executable': 'nim',
 \    'output_stream': 'both',
 \    'command_callback': 'ale_linters#nim#nimcheck#GetCommand',
-\    'callback': 'ale_linters#nim#nimcheck#Handle'
+\    'callback': 'ale_linters#nim#nimcheck#Handle',
+\    'lint_file': 1,
 \})

ale_linters/objc/clang.vim

@@ -0,0 +1,23 @@
+" Author: Bang Lee <https://github.com/Qusic>
+" Description: clang linter for objc files
+
+" Set this option to change the Clang options for warnings for ObjC.
+if !exists('g:ale_objc_clang_options')
+    let g:ale_objc_clang_options = '-std=c11 -Wall'
+endif
+
+function! ale_linters#objc#clang#GetCommand(buffer) abort
+    " -iquote with the directory the file is in makes #include work for
+    "  headers in the same directory.
+    return 'clang -S -x objective-c -fsyntax-only '
+    \   . '-iquote ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h'))
+    \   . ' ' . ale#Var(a:buffer, 'objc_clang_options') . ' -'
+endfunction
+
+call ale#linter#Define('objc', {
+\   'name': 'clang',
+\   'output_stream': 'stderr',
+\   'executable': 'clang',
+\   'command_callback': 'ale_linters#objc#clang#GetCommand',
+\   'callback': 'ale#handlers#gcc#HandleGCCFormat',
+\})

ale_linters/objcpp/clang.vim

@@ -0,0 +1,23 @@
+" Author: Bang Lee <https://github.com/Qusic>
+" Description: clang linter for objcpp files
+
+" Set this option to change the Clang options for warnings for ObjCPP.
+if !exists('g:ale_objcpp_clang_options')
+    let g:ale_objcpp_clang_options = '-std=c++14 -Wall'
+endif
+
+function! ale_linters#objcpp#clang#GetCommand(buffer) abort
+    " -iquote with the directory the file is in makes #include work for
+    "  headers in the same directory.
+    return 'clang++ -S -x objective-c++ -fsyntax-only '
+    \   . '-iquote ' . ale#Escape(fnamemodify(bufname(a:buffer), ':p:h'))
+    \   . ' ' . ale#Var(a:buffer, 'objcpp_clang_options') . ' -'
+endfunction
+
+call ale#linter#Define('objcpp', {
+\   'name': 'clang',
+\   'output_stream': 'stderr',
+\   'executable': 'clang++',
+\   'command_callback': 'ale_linters#objcpp#clang#GetCommand',
+\   'callback': 'ale#handlers#gcc#HandleGCCFormat',
+\})

ale_linters/perl/perl.vim

@@ -5,7 +5,7 @@ let g:ale_perl_perl_executable =
 \   get(g:, 'ale_perl_perl_executable', 'perl')
 
 let g:ale_perl_perl_options =
-\   get(g:, 'ale_perl_perl_options', '-X -c -Mwarnings -Ilib')
+\   get(g:, 'ale_perl_perl_options', '-c -Mwarnings -Ilib')
 
 function! ale_linters#perl#perl#GetExecutable(buffer) abort
     return ale#Var(a:buffer, 'perl_perl_executable')
@@ -17,20 +17,33 @@ function! ale_linters#perl#perl#GetCommand(buffer) abort
     \   . ' %t'
 endfunction
 
+let s:begin_failed_skip_pattern = '\v' . join([
+\   '^Compilation failed in require',
+\   '^Can''t locate',
+\], '|')
+
 function! ale_linters#perl#perl#Handle(buffer, lines) abort
     let l:pattern = '\(.\+\) at \(.\+\) line \(\d\+\)'
     let l:output = []
+    let l:basename = expand('#' . a:buffer . ':t')
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
         let l:line = l:match[3]
         let l:text = l:match[1]
         let l:type = 'E'
 
-        call add(l:output, {
-        \   'lnum': l:line,
-        \   'text': l:text,
-        \   'type': l:type,
-        \})
+        if ale#path#IsBufferPath(a:buffer, l:match[2])
+        \ && (
+        \   l:text !=# 'BEGIN failed--compilation aborted'
+        \   || empty(l:output)
+        \   || match(l:output[-1].text, s:begin_failed_skip_pattern) < 0
+        \ )
+            call add(l:output, {
+            \   'lnum': l:line,
+            \   'text': l:text,
+            \   'type': l:type,
+            \})
+        endif
     endfor
 
     return l:output

ale_linters/perl/perlcritic.vim

@@ -1,14 +1,29 @@
 " Author: Vincent Lequertier <https://github.com/SkySymbol>
 " Description: This file adds support for checking perl with perl critic
 
+if !exists('g:ale_perl_perlcritic_showrules')
+    let g:ale_perl_perlcritic_showrules = 0
+endif
+
+function! ale_linters#perl#perlcritic#GetCommand(buffer) abort
+    let l:critic_verbosity = '%l:%c %m\n'
+    if g:ale_perl_perlcritic_showrules
+        let l:critic_verbosity = '%l:%c %m [%p]\n'
+    endif
+
+    return "perlcritic --verbose '". l:critic_verbosity . "' --nocolor"
+endfunction
+
+
 function! ale_linters#perl#perlcritic#Handle(buffer, lines) abort
-    let l:pattern = '\(.\+\) at \(.\+\) line \(\d\+\)'
+    let l:pattern = '\(\d\+\):\(\d\+\) \(.\+\)'
     let l:output = []
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
         call add(l:output, {
-        \   'text': l:match[1],
-        \   'lnum': l:match[3],
+        \   'lnum': l:match[1],
+        \   'col': l:match[2],
+        \   'text': l:match[3],
         \})
     endfor
 
@@ -19,6 +34,6 @@ call ale#linter#Define('perl', {
 \   'name': 'perlcritic',
 \   'executable': 'perlcritic',
 \   'output_stream': 'stdout',
-\   'command': 'perlcritic --verbose 3 --nocolor',
+\   'command_callback': 'ale_linters#perl#perlcritic#GetCommand',
 \   'callback': 'ale_linters#perl#perlcritic#Handle',
 \})

ale_linters/php/php.vim

@@ -4,17 +4,23 @@
 function! ale_linters#php#php#Handle(buffer, lines) abort
     " Matches patterns like the following:
     "
-    " PHP Parse error:  syntax error, unexpected ';', expecting ']' in - on line 15
+    " Parse error:  syntax error, unexpected ';', expecting ']' in - on line 15
     let l:pattern = '\v^%(Fatal|Parse) error:\s+(.+unexpected ''(.+)%(expecting.+)@<!''.*|.+) in - on line (\d+)'
-
     let l:output = []
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
-        call add(l:output, {
+        let l:col = empty(l:match[2]) ? 0 : stridx(getline(l:match[3]), l:match[2]) + 1
+        let l:obj = {
         \   'lnum': l:match[3] + 0,
-        \   'col': empty(l:match[2]) ? 0 : stridx(getline(l:match[3]), l:match[2]) + 1,
+        \   'col': l:col,
         \   'text': l:match[1],
-        \})
+        \}
+
+        if l:col != 0
+            let l:obj.end_col = l:col + strlen(l:match[2]) - 1
+        endif
+
+        call add(l:output, l:obj)
     endfor
 
     return l:output

ale_linters/php/phpcs.vim

@@ -1,15 +1,28 @@
-" Author: jwilliams108 <https://github.com/jwilliams108>
+" Author: jwilliams108 <https://github.com/jwilliams108>, Eric Stern <https://github.com/firehed>
 " Description: phpcs for PHP files
 
 let g:ale_php_phpcs_standard = get(g:, 'ale_php_phpcs_standard', '')
 
+call ale#Set('php_phpcs_executable', 'phpcs')
+call ale#Set('php_phpcs_use_global', 0)
+
+function! ale_linters#php#phpcs#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'php_phpcs', [
+    \   'vendor/bin/phpcs',
+    \   'phpcs'
+    \])
+endfunction
+
 function! ale_linters#php#phpcs#GetCommand(buffer) abort
+    let l:executable = ale_linters#php#phpcs#GetExecutable(a:buffer)
+
     let l:standard = ale#Var(a:buffer, 'php_phpcs_standard')
     let l:standard_option = !empty(l:standard)
     \   ? '--standard=' . l:standard
     \   : ''
 
-    return 'phpcs -s --report=emacs --stdin-path=%s ' . l:standard_option
+    return ale#Escape(l:executable)
+    \   . ' -s --report=emacs --stdin-path=%s ' . l:standard_option
 endfunction
 
 function! ale_linters#php#phpcs#Handle(buffer, lines) abort
@@ -36,7 +49,7 @@ endfunction
 
 call ale#linter#Define('php', {
 \   'name': 'phpcs',
-\   'executable': 'phpcs',
+\   'executable_callback': 'ale_linters#php#phpcs#GetExecutable',
 \   'command_callback': 'ale_linters#php#phpcs#GetCommand',
 \   'callback': 'ale_linters#php#phpcs#Handle',
 \})

ale_linters/python/flake8.vim

@@ -48,7 +48,7 @@ function! ale_linters#python#flake8#VersionCheck(buffer) abort
         return ''
     endif
 
-    let l:executable = shellescape(ale_linters#python#flake8#GetExecutable(a:buffer))
+    let l:executable = ale#Escape(ale_linters#python#flake8#GetExecutable(a:buffer))
     let l:module_string = s:UsingModule(a:buffer) ? ' -m flake8' : ''
 
     return l:executable . l:module_string . ' --version'
@@ -89,17 +89,84 @@ function! ale_linters#python#flake8#GetCommand(buffer, version_output) abort
 
     let l:options = ale#Var(a:buffer, 'python_flake8_options')
 
-    return shellescape(ale_linters#python#flake8#GetExecutable(a:buffer))
+    return ale#Escape(ale_linters#python#flake8#GetExecutable(a:buffer))
     \   . (!empty(l:options) ? ' ' . l:options : '')
     \   . l:display_name_args . ' -'
 endfunction
 
+let s:end_col_pattern_map = {
+\   'F405': '\(.\+\) may be undefined',
+\   'F821': 'undefined name ''\([^'']\+\)''',
+\   'F999': '^''\([^'']\+\)''',
+\   'F841': 'local variable ''\([^'']\+\)''',
+\}
+
+function! ale_linters#python#flake8#Handle(buffer, lines) abort
+    for l:line in a:lines[:10]
+        if match(l:line, '^Traceback') >= 0
+            return [{
+            \   'lnum': 1,
+            \   'text': 'An exception was thrown. See :ALEDetail',
+            \   'detail': join(a:lines, "\n"),
+            \}]
+        endif
+    endfor
+
+    " Matches patterns line the following:
+    "
+    " Matches patterns line the following:
+    "
+    " stdin:6:6: E111 indentation is not a multiple of four
+    let l:pattern = '\v^[a-zA-Z]?:?[^:]+:(\d+):?(\d+)?: ([[:alnum:]]+) (.*)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        let l:code = l:match[3]
+
+        if (l:code ==# 'W291' || l:code ==# 'W293')
+        \ && !ale#Var(a:buffer, 'warn_about_trailing_whitespace')
+            " Skip warnings for trailing whitespace if the option is off.
+            continue
+        endif
+
+        let l:item = {
+        \   'lnum': l:match[1] + 0,
+        \   'col': l:match[2] + 0,
+        \   'text': l:code . ': ' . l:match[4],
+        \   'type': 'W',
+        \}
+
+        if l:code[:0] ==# 'F' || l:code ==# 'E999'
+            let l:item.type = 'E'
+        elseif l:code[:0] ==# 'E'
+            let l:item.type = 'E'
+            let l:item.sub_type = 'style'
+        elseif l:code[:0] ==# 'W'
+            let l:item.sub_type = 'style'
+        endif
+
+        let l:end_col_pattern = get(s:end_col_pattern_map, l:code, '')
+
+        if !empty(l:end_col_pattern)
+            let l:end_col_match = matchlist(l:match[4], l:end_col_pattern)
+
+            if !empty(l:end_col_match)
+                let l:item.end_col = l:item.col + len(l:end_col_match[1]) - 1
+            endif
+        endif
+
+        call add(l:output, l:item)
+    endfor
+
+    return l:output
+endfunction
+
 call ale#linter#Define('python', {
 \   'name': 'flake8',
 \   'executable_callback': 'ale_linters#python#flake8#GetExecutable',
 \   'command_chain': [
 \       {'callback': 'ale_linters#python#flake8#VersionCheck'},
-\       {'callback': 'ale_linters#python#flake8#GetCommand'},
+\       {'callback': 'ale_linters#python#flake8#GetCommand', 'output_stream': 'both'},
 \   ],
-\   'callback': 'ale#handlers#python#HandlePEP8Format',
+\   'callback': 'ale_linters#python#flake8#Handle',
 \})

ale_linters/python/mypy.vim

@@ -7,19 +7,7 @@ let g:ale_python_mypy_options = get(g:, 'ale_python_mypy_options', '')
 let g:ale_python_mypy_use_global = get(g:, 'ale_python_mypy_use_global', 0)
 
 function! ale_linters#python#mypy#GetExecutable(buffer) abort
-    if !ale#Var(a:buffer, 'python_mypy_use_global')
-        let l:virtualenv = ale#python#FindVirtualenv(a:buffer)
-
-        if !empty(l:virtualenv)
-            let l:ve_mypy = l:virtualenv . '/bin/mypy'
-
-            if executable(l:ve_mypy)
-                return l:ve_mypy
-            endif
-        endif
-    endif
-
-    return ale#Var(a:buffer, 'python_mypy_executable')
+    return ale#python#FindExecutable(a:buffer, 'python_mypy', ['/bin/mypy'])
 endfunction
 
 function! ale_linters#python#mypy#GetCommand(buffer) abort
@@ -30,10 +18,10 @@ function! ale_linters#python#mypy#GetCommand(buffer) abort
     let l:executable = ale_linters#python#mypy#GetExecutable(a:buffer)
 
     return l:cd_command
-    \   . shellescape(l:executable)
+    \   . ale#Escape(l:executable)
     \   . ' --show-column-numbers '
     \   . ale#Var(a:buffer, 'python_mypy_options')
-    \   . ' %s'
+    \   . ' --shadow-file %s %t %s'
 endfunction
 
 function! ale_linters#python#mypy#Handle(buffer, lines) abort
@@ -69,5 +57,4 @@ call ale#linter#Define('python', {
 \   'executable_callback': 'ale_linters#python#mypy#GetExecutable',
 \   'command_callback': 'ale_linters#python#mypy#GetCommand',
 \   'callback': 'ale_linters#python#mypy#Handle',
-\   'lint_file': 1,
 \})

ale_linters/python/pylint.vim

@@ -26,7 +26,7 @@ function! ale_linters#python#pylint#GetExecutable(buffer) abort
 endfunction
 
 function! ale_linters#python#pylint#GetCommand(buffer) abort
-    return shellescape(ale_linters#python#pylint#GetExecutable(a:buffer))
+    return ale#Escape(ale_linters#python#pylint#GetExecutable(a:buffer))
     \   . ' ' . ale#Var(a:buffer, 'python_pylint_options')
     \   . ' --output-format text --msg-template="{path}:{line}:{column}: {msg_id} ({symbol}) {msg}" --reports n'
     \   . ' %s'
@@ -36,7 +36,7 @@ function! ale_linters#python#pylint#Handle(buffer, lines) abort
     " Matches patterns like the following:
     "
     " test.py:4:4: W0101 (unreachable) Unreachable code
-    let l:pattern = '\v^[^:]+:(\d+):(\d+): ([[:alnum:]]+) \((.*)\) (.*)$'
+    let l:pattern = '\v^[^:]+:(\d+):(\d+): ([[:alnum:]]+) \(([^(]*)\) (.*)$'
     let l:output = []
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
@@ -57,7 +57,7 @@ function! ale_linters#python#pylint#Handle(buffer, lines) abort
         call add(l:output, {
         \   'lnum': l:match[1] + 0,
         \   'col': l:match[2] + 1,
-        \   'text': l:code . ': ' . l:match[5],
+        \   'text': l:code . ': ' . l:match[5] . ' (' . l:match[4] . ')',
         \   'type': l:code[:0] ==# 'E' ? 'E' : 'W',
         \})
     endfor

ale_linters/ruby/brakeman.vim

@@ -5,6 +5,10 @@ let g:ale_ruby_brakeman_options =
 \   get(g:, 'ale_ruby_brakeman_options', '')
 
 function! ale_linters#ruby#brakeman#Handle(buffer, lines) abort
+    if len(a:lines) == 0
+        return []
+    endif
+
     let l:result = json_decode(join(a:lines, ''))
 
     let l:output = []
@@ -40,7 +44,7 @@ function! ale_linters#ruby#brakeman#GetCommand(buffer) abort
 
     return 'brakeman -f json -q '
     \    . ale#Var(a:buffer, 'ruby_brakeman_options')
-    \    . ' -p ' . l:rails_root
+    \    . ' -p ' . ale#Escape(l:rails_root)
 endfunction
 
 function! s:FindRailsRoot(buffer) abort

ale_linters/ruby/rubocop.vim

@@ -1,6 +1,18 @@
 " Author: ynonp - https://github.com/ynonp
 " Description: rubocop for Ruby files
 
+function! ale_linters#ruby#rubocop#GetCommand(buffer) abort
+    let l:executable = ale#handlers#rubocop#GetExecutable(a:buffer)
+    let l:exec_args = l:executable =~? 'bundle$'
+    \   ? ' exec rubocop'
+    \   : ''
+
+    return ale#Escape(l:executable) . l:exec_args
+    \   . ' --format emacs --force-exclusion '
+    \   . ale#Var(a:buffer, 'ruby_rubocop_options')
+    \   . ' --stdin ' . bufname(a:buffer)
+endfunction
+
 function! ale_linters#ruby#rubocop#Handle(buffer, lines) abort
     " Matches patterns line the following:
     "
@@ -24,21 +36,9 @@ function! ale_linters#ruby#rubocop#Handle(buffer, lines) abort
     return l:output
 endfunction
 
-function! ale_linters#ruby#rubocop#GetCommand(buffer) abort
-    return 'rubocop --format emacs --force-exclusion '
-    \   . ale#Var(a:buffer, 'ruby_rubocop_options')
-    \   . ' --stdin ' . bufname(a:buffer)
-endfunction
-
-" Set this option to change Rubocop options.
-if !exists('g:ale_ruby_rubocop_options')
-    " let g:ale_ruby_rubocop_options = '--lint'
-    let g:ale_ruby_rubocop_options = ''
-endif
-
 call ale#linter#Define('ruby', {
 \   'name': 'rubocop',
-\   'executable': 'rubocop',
+\   'executable_callback': 'ale#handlers#rubocop#GetExecutable',
 \   'command_callback': 'ale_linters#ruby#rubocop#GetCommand',
 \   'callback': 'ale_linters#ruby#rubocop#Handle',
 \})

ale_linters/sass/stylelint.vim

@@ -1,21 +1,12 @@
 " Author: diartyz <diartyz@gmail.com>
 
-let g:ale_sass_stylelint_executable =
-\   get(g:, 'ale_sass_stylelint_executable', 'stylelint')
-
-let g:ale_sass_stylelint_use_global =
-\   get(g:, 'ale_sass_stylelint_use_global', 0)
+call ale#Set('sass_stylelint_executable', 'stylelint')
+call ale#Set('sass_stylelint_use_global', 0)
 
 function! ale_linters#sass#stylelint#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'sass_stylelint_use_global')
-        return ale#Var(a:buffer, 'sass_stylelint_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'sass_stylelint', [
     \   'node_modules/.bin/stylelint',
-    \   ale#Var(a:buffer, 'sass_stylelint_executable')
-    \)
+    \])
 endfunction
 
 function! ale_linters#sass#stylelint#GetCommand(buffer) abort

ale_linters/scss/stylelint.vim

@@ -1,21 +1,12 @@
 " Author: diartyz <diartyz@gmail.com>
 
-let g:ale_scss_stylelint_executable =
-\   get(g:, 'ale_scss_stylelint_executable', 'stylelint')
-
-let g:ale_scss_stylelint_use_global =
-\   get(g:, 'ale_scss_stylelint_use_global', 0)
+call ale#Set('scss_stylelint_executable', 'stylelint')
+call ale#Set('scss_stylelint_use_global', 0)
 
 function! ale_linters#scss#stylelint#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'scss_stylelint_use_global')
-        return ale#Var(a:buffer, 'scss_stylelint_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'scss_stylelint', [
     \   'node_modules/.bin/stylelint',
-    \   ale#Var(a:buffer, 'scss_stylelint_executable')
-    \)
+    \])
 endfunction
 
 function! ale_linters#scss#stylelint#GetCommand(buffer) abort

ale_linters/tex/chktex.vim

@@ -18,7 +18,7 @@ function! ale_linters#tex#chktex#GetCommand(buffer) abort
     let l:command .= ' -v0 -p stdin -q'
 
     if !empty(l:chktex_config)
-        let l:command .= ' -l ' . shellescape(l:chktex_config)
+        let l:command .= ' -l ' . ale#Escape(l:chktex_config)
     endif
 
     let l:command .= ' ' . ale#Var(a:buffer, 'tex_chktex_options')

ale_linters/typescript/eslint.vim

@@ -0,0 +1,9 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: eslint for JavaScript files
+
+call ale#linter#Define('typescript', {
+\   'name': 'eslint',
+\   'executable_callback': 'ale#handlers#eslint#GetExecutable',
+\   'command_callback': 'ale#handlers#eslint#GetCommand',
+\   'callback': 'ale#handlers#eslint#Handle',
+\})

ale_linters/typescript/tslint.vim

@@ -1,47 +1,30 @@
 " Author: Prashanth Chandra https://github.com/prashcr
 " Description: tslint for TypeScript files
 
-let g:ale_typescript_tslint_executable =
-\   get(g:, 'ale_typescript_tslint_executable', 'tslint')
-
-let g:ale_typescript_tslint_config_path =
-\   get(g:, 'ale_typescript_tslint_config_path', '')
-
-let g:ale_typescript_tslint_use_global =
-\   get(g:, 'ale_typescript_tslint_use_global', 0)
+call ale#Set('typescript_tslint_executable', 'tslint')
+call ale#Set('typescript_tslint_config_path', '')
+call ale#Set('typescript_tslint_use_global', 0)
 
 function! ale_linters#typescript#tslint#GetExecutable(buffer) abort
-    if ale#Var(a:buffer, 'typescript_tslint_use_global')
-        return ale#Var(a:buffer, 'typescript_tslint_executable')
-    endif
-
-    return ale#path#ResolveLocalPath(
-    \   a:buffer,
+    return ale#node#FindExecutable(a:buffer, 'typescript_tslint', [
     \   'node_modules/.bin/tslint',
-    \   ale#Var(a:buffer, 'typescript_tslint_executable')
-    \)
+    \])
 endfunction
 
 function! ale_linters#typescript#tslint#Handle(buffer, lines) abort
-    " Matches patterns like the following:
-    "
-    " hello.ts[7, 41]: trailing whitespace
-    " hello.ts[5, 1]: Forbidden 'var' keyword, use 'let' or 'const' instead
-    "
-    let l:ext = '.' . fnamemodify(bufname(a:buffer), ':e')
-    let l:pattern = '.\+' . l:ext . '\[\(\d\+\), \(\d\+\)\]: \(.\+\)'
     let l:output = []
 
-    for l:match in ale#util#GetMatches(a:lines, l:pattern)
-        let l:line = l:match[1] + 0
-        let l:column = l:match[2] + 0
-        let l:text = l:match[3]
-
-        call add(l:output, {
-        \   'lnum': l:line,
-        \   'col': l:column,
-        \   'text': l:text,
-        \})
+    for l:error in json_decode(join(a:lines, ''))
+        if ale#path#IsBufferPath(a:buffer, l:error.name)
+            call add(l:output, {
+            \   'type': (get(l:error, 'ruleSeverity', '') ==# 'WARNING' ? 'W' : 'E'),
+            \   'text': l:error.failure,
+            \   'lnum': l:error.startPosition.line + 1,
+            \   'col': l:error.startPosition.character + 1,
+            \   'end_lnum': l:error.endPosition.line + 1,
+            \   'end_col': l:error.endPosition.character + 1,
+            \})
+        endif
     endfor
 
     return l:output
@@ -55,11 +38,12 @@ function! ale_linters#typescript#tslint#BuildLintCommand(buffer) abort
     \)
 
     let l:tslint_config_option = !empty(l:tslint_config_path)
-    \   ? '-c ' . shellescape(l:tslint_config_path)
+    \   ? ' -c ' . ale#Escape(l:tslint_config_path)
     \   : ''
 
     return ale_linters#typescript#tslint#GetExecutable(a:buffer)
-    \   . ' ' . l:tslint_config_option
+    \   . ' --format json'
+    \   . l:tslint_config_option
     \   . ' %t'
 endfunction
 

ale_linters/typescript/tsserver.vim

@@ -0,0 +1,23 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: tsserver integration for ALE
+
+call ale#Set('typescript_tsserver_executable', 'tsserver')
+call ale#Set('typescript_tsserver_config_path', '')
+call ale#Set('typescript_tsserver_use_global', 0)
+
+function! ale_linters#typescript#tsserver#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'typescript_tsserver', [
+    \   'node_modules/.bin/tsserver',
+    \])
+endfunction
+
+function! ale_linters#typescript#tsserver#Handle(buffer, lines) abort
+    return a:lines
+endfunction
+
+call ale#linter#Define('typescript', {
+\   'name': 'tsserver',
+\   'lsp': 'tsserver',
+\   'executable_callback': 'ale_linters#typescript#tsserver#GetExecutable',
+\   'callback': 'ale_linters#typescript#tsserver#Handle',
+\})

ale_linters/verilog/verilator.vim

@@ -8,7 +8,7 @@ function! ale_linters#verilog#verilator#GetCommand(buffer) abort
     call ale#engine#ManageFile(a:buffer, l:filename)
     call writefile(getbufline(a:buffer, 1, '$'), l:filename)
 
-    return 'verilator --lint-only -Wall -Wno-DECLFILENAME ' . shellescape(l:filename)
+    return 'verilator --lint-only -Wall -Wno-DECLFILENAME ' . ale#Escape(l:filename)
 endfunction
 
 function! ale_linters#verilog#verilator#Handle(buffer, lines) abort

ale_linters/vim/vint.vim

@@ -4,18 +4,33 @@
 " This flag can be used to change enable/disable style issues.
 let g:ale_vim_vint_show_style_issues =
 \   get(g:, 'ale_vim_vint_show_style_issues', 1)
-
-let s:vint_version = ale#semver#Parse(system('vint --version'))
-let s:can_use_no_color_flag = ale#semver#GreaterOrEqual(s:vint_version, [0, 3, 7])
 let s:enable_neovim = has('nvim') ? ' --enable-neovim ' : ''
 let s:format = '-f "{file_path}:{line_number}:{column_number}: {severity}: {description} (see {reference})"'
+let s:vint_version = []
+
+function! ale_linters#vim#vint#VersionCommand(buffer) abort
+    if empty(s:vint_version)
+        " Check the Vint version if we haven't checked it already.
+        return 'vint --version'
+    endif
+
+    return ''
+endfunction
+
+function! ale_linters#vim#vint#GetCommand(buffer, version_output) abort
+    if empty(s:vint_version) && !empty(a:version_output)
+        " Parse the version out of the --version output.
+        let s:vint_version = ale#semver#Parse(join(a:version_output, "\n"))
+    endif
+
+    let l:can_use_no_color_flag = empty(s:vint_version)
+    \   || ale#semver#GreaterOrEqual(s:vint_version, [0, 3, 7])
 
-function! ale_linters#vim#vint#GetCommand(buffer) abort
     let l:warning_flag = ale#Var(a:buffer, 'vim_vint_show_style_issues') ? '-s' : '-w'
 
     return 'vint '
     \   . l:warning_flag . ' '
-    \   . (s:can_use_no_color_flag ? '--no-color ' : '')
+    \   . (l:can_use_no_color_flag ? '--no-color ' : '')
     \   . s:enable_neovim
     \   . s:format
     \   . ' %t'
@@ -24,6 +39,9 @@ endfunction
 call ale#linter#Define('vim', {
 \   'name': 'vint',
 \   'executable': 'vint',
-\   'command_callback': 'ale_linters#vim#vint#GetCommand',
+\   'command_chain': [
+\       {'callback': 'ale_linters#vim#vint#VersionCommand', 'output_stream': 'stderr'},
+\       {'callback': 'ale_linters#vim#vint#GetCommand', 'output_stream': 'stdout'},
+\   ],
 \   'callback': 'ale#handlers#gcc#HandleGCCFormat',
 \})

ale_linters/xml/xmllint.vim

@@ -0,0 +1,69 @@
+" Author: q12321q <q12321q@gmail.com>
+" Description: This file adds support for checking XML code with xmllint.
+
+" CLI options
+let g:ale_xml_xmllint_executable = get(g:, 'ale_xml_xmllint_executable', 'xmllint')
+let g:ale_xml_xmllint_options = get(g:, 'ale_xml_xmllint_options', '')
+
+function! ale_linters#xml#xmllint#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'xml_xmllint_executable')
+endfunction
+
+function! ale_linters#xml#xmllint#GetCommand(buffer) abort
+    return ale#Escape(ale_linters#xml#xmllint#GetExecutable(a:buffer))
+    \   . ' ' . ale#Var(a:buffer, 'xml_xmllint_options')
+    \   . ' --noout -'
+endfunction
+
+function! ale_linters#xml#xmllint#Handle(buffer, lines) abort
+    " Matches patterns lines like the following:
+    " file/path:123: error level : error message
+    let l:pattern_message = '\v^([^:]+):(\d+):\s*(([^:]+)\s*:\s+.*)$'
+
+    " parse column token line like that:
+    " file/path:123: parser error : Opening and ending tag mismatch: foo line 1 and bar
+    " </bar>
+    "       ^
+    let l:pattern_column_token = '\v^\s*\^$'
+
+    let l:output = []
+
+    for l:line in a:lines
+
+        " Parse error/warning lines
+        let l:match_message = matchlist(l:line, l:pattern_message)
+        if !empty(l:match_message)
+          let l:line = l:match_message[2] + 0
+          let l:type = l:match_message[4] =~? 'warning' ? 'W' : 'E'
+          let l:text = l:match_message[3]
+
+          call add(l:output, {
+          \   'lnum': l:line,
+          \   'text': l:text,
+          \   'type': l:type,
+          \})
+
+          continue
+        endif
+
+        " Parse column position
+        let l:match_column_token = matchlist(l:line, l:pattern_column_token)
+        if !empty(l:output) && !empty(l:match_column_token)
+          let l:previous = l:output[len(l:output) - 1]
+          let l:previous['col'] = len(l:match_column_token[0])
+
+          continue
+        endif
+
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('xml', {
+\   'name': 'xmllint',
+\   'output_stream': 'stderr',
+\   'executable_callback': 'ale_linters#xml#xmllint#GetExecutable',
+\   'command_callback': 'ale_linters#xml#xmllint#GetCommand',
+\   'callback': 'ale_linters#xml#xmllint#Handle',
+\ })

autoload/ale.vim

@@ -1,4 +1,4 @@
-" Author: w0rp <devw0rp@gmail.com>
+" Author: w0rp <devw0rp@gmail.com>, David Alexander <opensource@thelonelyghost.com>
 " Description: Primary code path for the plugin
 "   Manages execution of linters when requested by autocommands
 
@@ -6,6 +6,13 @@ let s:lint_timer = -1
 let s:queued_buffer_number = -1
 let s:should_lint_file_for_buffer = {}
 
+" Return 1 if a file is too large for ALE to handle.
+function! ale#FileTooLarge() abort
+    let l:max = ale#Var(bufnr(''), 'maximum_file_size')
+
+    return l:max > 0 ? (line2byte(line('$') + 1) > l:max) : 0
+endfunction
+
 " A function for checking various conditions whereby ALE just shouldn't
 " attempt to do anything, say if particular buffer types are open in Vim.
 function! ale#ShouldDoNothing() abort
@@ -14,6 +21,8 @@ function! ale#ShouldDoNothing() abort
     return index(g:ale_filetype_blacklist, &filetype) >= 0
     \   || (exists('*getcmdwintype') && !empty(getcmdwintype()))
     \   || ale#util#InSandbox()
+    \   || !ale#Var(bufnr(''), 'enabled')
+    \   || ale#FileTooLarge()
 endfunction
 
 " (delay, [linting_flag])
@@ -76,7 +85,8 @@ function! ale#Lint(...) abort
     " Check if we previously requested checking the file.
     if has_key(s:should_lint_file_for_buffer, l:buffer)
         unlet s:should_lint_file_for_buffer[l:buffer]
-        let l:should_lint_file = 1
+        " Lint files if they exist.
+        let l:should_lint_file = filereadable(expand('#' . l:buffer . ':p'))
     endif
 
     " Initialise the buffer information if needed.
@@ -95,6 +105,8 @@ function! ale#Lint(...) abort
         call filter(l:linters, '!v:val.lint_file')
     endif
 
+    call ale#engine#StopCurrentJobs(l:buffer, l:should_lint_file)
+
     for l:linter in l:linters
         call ale#engine#Invoke(l:buffer, l:linter)
     endfor
@@ -119,7 +131,46 @@ endfunction
 "
 " Every variable name will be prefixed with 'ale_'.
 function! ale#Var(buffer, variable_name) abort
+    let l:nr = str2nr(a:buffer)
     let l:full_name = 'ale_' . a:variable_name
 
-    return getbufvar(str2nr(a:buffer), l:full_name, g:[l:full_name])
+    if bufexists(l:nr)
+        let l:vars = getbufvar(l:nr, '')
+    elseif has_key(g:, 'ale_fix_buffer_data')
+        let l:vars = get(g:ale_fix_buffer_data, l:nr, {'vars': {}}).vars
+    else
+        let l:vars = {}
+    endif
+
+    return get(l:vars, l:full_name, g:[l:full_name])
+endfunction
+
+" Initialize a variable with a default value, if it isn't already set.
+"
+" Every variable name will be prefixed with 'ale_'.
+function! ale#Set(variable_name, default) abort
+    let l:full_name = 'ale_' . a:variable_name
+    let l:value = get(g:, l:full_name, a:default)
+    let g:[l:full_name] = l:value
+
+    return l:value
+endfunction
+
+" Escape a string suitably for each platform.
+" shellescape does not work on Windows.
+function! ale#Escape(str) abort
+    if fnamemodify(&shell, ':t') ==? 'cmd.exe'
+        " If the string contains spaces, it will be surrounded by quotes.
+        " Otherwise, special characters will be escaped with carets (^).
+        return substitute(
+        \   a:str =~# ' '
+        \       ?  '"' .  substitute(a:str, '"', '""', 'g') . '"'
+        \       : substitute(a:str, '\v([&|<>^])', '^\1', 'g'),
+        \   '%',
+        \   '%%',
+        \   'g',
+        \)
+    endif
+
+    return shellescape (a:str)
 endfunction

autoload/ale/balloon.vim

@@ -0,0 +1,21 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: balloonexpr support for ALE.
+
+function! ale#balloon#MessageForPos(bufnr, lnum, col) abort
+    let l:loclist = get(g:ale_buffer_info, a:bufnr, {'loclist': []}).loclist
+    let l:index = ale#util#BinarySearch(l:loclist, a:lnum, a:col)
+
+    return l:index >= 0 ? l:loclist[l:index].text : ''
+endfunction
+
+function! ale#balloon#Expr() abort
+    return ale#balloon#MessageForPos(v:beval_bufnr, v:beval_lnum, v:beval_col)
+endfunction
+
+function! ale#balloon#Disable() abort
+    set noballooneval
+endfunction
+
+function! ale#balloon#Enable() abort
+    set ballooneval balloonexpr=ale#balloon#Expr()
+endfunction

autoload/ale/c.vim

@@ -0,0 +1,91 @@
+" Author: gagbo <gagbobada@gmail.com>, w0rp <devw0rp@gmail.com>
+" Description: Functions for integrating with C-family linters.
+
+function! ale#c#FindProjectRoot(buffer) abort
+    for l:project_filename in ['.git/HEAD', 'configure', 'Makefile', 'CMakeLists.txt']
+        let l:full_path = ale#path#FindNearestFile(a:buffer, l:project_filename)
+
+        if !empty(l:full_path)
+            let l:path = fnamemodify(l:full_path, ':h')
+
+            " Correct .git path detection.
+            if fnamemodify(l:path, ':t') ==# '.git'
+                let l:path = fnamemodify(l:path, ':h')
+            endif
+
+            return l:path
+        endif
+    endfor
+
+    return ''
+endfunction
+
+" Given a buffer number, search for a project root, and output a List
+" of directories to include based on some heuristics.
+"
+" For projects with headers in the project root, the project root will
+" be returned.
+"
+" For projects with an 'include' directory, that directory will be returned.
+function! ale#c#FindLocalHeaderPaths(buffer) abort
+    let l:project_root = ale#c#FindProjectRoot(a:buffer)
+
+    if empty(l:project_root)
+        return []
+    endif
+
+    " See if we can find .h files directory in the project root.
+    " If we can, that's our include directory.
+    if !empty(globpath(l:project_root, '*.h', 0))
+        return [l:project_root]
+    endif
+
+    " Look for .hpp files too.
+    if !empty(globpath(l:project_root, '*.hpp', 0))
+        return [l:project_root]
+    endif
+
+    " If we find an 'include' directory in the project root, then use that.
+    if isdirectory(l:project_root . '/include')
+        return [simplify(l:project_root . '/include')]
+    endif
+
+    return []
+endfunction
+
+" Given a List of include paths, create a string containing the -I include
+" options for those paths, with the paths escaped for use in the shell.
+function! ale#c#IncludeOptions(include_paths) abort
+    let l:option_list = []
+
+    for l:path in a:include_paths
+        call add(l:option_list, '-I' . ale#Escape(l:path))
+    endfor
+
+    if empty(l:option_list)
+        return ''
+    endif
+
+    return ' ' . join(l:option_list) . ' '
+endfunction
+
+let g:ale_c_build_dir_names = get(g:, 'ale_c_build_dir_names', [
+\   'build',
+\   'bin',
+\])
+
+" Given a buffer number, find the build subdirectory with compile commands
+" The subdirectory is returned without the trailing /
+function! ale#c#FindCompileCommands(buffer) abort
+    for l:path in ale#path#Upwards(expand('#' . a:buffer . ':p:h'))
+        for l:dirname in ale#Var(a:buffer, 'c_build_dir_names')
+            let l:c_build_dir = l:path . '/' . l:dirname
+
+            if filereadable(l:c_build_dir . '/compile_commands.json')
+                return l:c_build_dir
+            endif
+        endfor
+    endfor
+
+    return ''
+endfunction

autoload/ale/cleanup.vim

@@ -6,9 +6,7 @@ function! ale#cleanup#Buffer(buffer) abort
         call ale#engine#RemoveManagedFiles(a:buffer)
 
         " When buffers are removed, clear all of the jobs.
-        for l:job in get(g:ale_buffer_info[a:buffer], 'job_list', [])
-            call ale#engine#ClearJob(l:job)
-        endfor
+        call ale#engine#StopCurrentJobs(a:buffer, 1)
 
         " Clear delayed highlights for a buffer being removed.
         if g:ale_set_highlights

autoload/ale/command.vim

@@ -0,0 +1,57 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Special command formatting for creating temporary files and
+" passing buffer filenames easily.
+
+function! s:TemporaryFilename(buffer) abort
+    let l:filename = fnamemodify(bufname(a:buffer), ':t')
+
+    if empty(l:filename)
+        " If the buffer's filename is empty, create a dummy filename.
+        let l:ft = getbufvar(a:buffer, '&filetype')
+        let l:filename = 'file' . ale#filetypes#GuessExtension(l:ft)
+    endif
+
+    " Create a temporary filename, <temp_dir>/<original_basename>
+    " The file itself will not be created by this function.
+    return tempname() . (has('win32') ? '\' : '/') . l:filename
+endfunction
+
+" Given a command string, replace every...
+" %s -> with the current filename
+" %t -> with the name of an unused file in a temporary directory
+" %% -> with a literal %
+function! ale#command#FormatCommand(buffer, command, pipe_file_if_needed) abort
+    let l:temporary_file = ''
+    let l:command = a:command
+
+    " First replace all uses of %%, used for literal percent characters,
+    " with an ugly string.
+    let l:command = substitute(l:command, '%%', '<<PERCENTS>>', 'g')
+
+    " Replace all %s occurences in the string with the name of the current
+    " file.
+    if l:command =~# '%s'
+        let l:filename = fnamemodify(bufname(a:buffer), ':p')
+        let l:command = substitute(l:command, '%s', '\=ale#Escape(l:filename)', 'g')
+    endif
+
+    if l:command =~# '%t'
+        " Create a temporary filename, <temp_dir>/<original_basename>
+        " The file itself will not be created by this function.
+        let l:temporary_file = s:TemporaryFilename(a:buffer)
+        let l:command = substitute(l:command, '%t', '\=ale#Escape(l:temporary_file)', 'g')
+    endif
+
+    " Finish formatting so %% becomes %.
+    let l:command = substitute(l:command, '<<PERCENTS>>', '%', 'g')
+
+    if a:pipe_file_if_needed && empty(l:temporary_file)
+        " If we are to send the Vim buffer to a command, we'll do it
+        " in the shell. We'll write out the file to a temporary file,
+        " and then read it back in, in the shell.
+        let l:temporary_file = s:TemporaryFilename(a:buffer)
+        let l:command = l:command . ' < ' . ale#Escape(l:temporary_file)
+    endif
+
+    return [l:temporary_file, l:command]
+endfunction

autoload/ale/cursor.vim

@@ -7,15 +7,13 @@ function! s:GetMessage(linter, type, text) abort
     let l:type = a:type ==# 'E'
     \   ? g:ale_echo_msg_error_str
     \   : g:ale_echo_msg_warning_str
-    " Capitalize the 1st character
-    let l:text = toupper(a:text[0]) . a:text[1:-1]
 
     " Replace handlers if they exist
     for [l:k, l:v] in items({'linter': a:linter, 'severity': l:type})
         let l:msg = substitute(l:msg, '\V%' . l:k . '%', l:v, '')
     endfor
 
-    return printf(l:msg, l:text)
+    return printf(l:msg, a:text)
 endfunction
 
 function! s:EchoWithShortMess(setting, message) abort
@@ -68,6 +66,10 @@ function! s:StopCursorTimer() abort
 endfunction
 
 function! ale#cursor#EchoCursorWarning(...) abort
+    if ale#ShouldDoNothing()
+        return
+    endif
+
     " Only echo the warnings in normal mode, otherwise we will get problems.
     if mode() !=# 'n'
         return
@@ -110,6 +112,10 @@ function! ale#cursor#EchoCursorWarningWithDelay() abort
 endfunction
 
 function! ale#cursor#ShowCursorDetail() abort
+    if ale#ShouldDoNothing()
+        return
+    endif
+
     " Only echo the warnings in normal mode, otherwise we will get problems.
     if mode() !=# 'n'
         return

autoload/ale/debugging.vim

@@ -105,6 +105,22 @@ function! s:EchoCommandHistory() abort
     endfor
 endfunction
 
+function! s:EchoLinterAliases(all_linters) abort
+    let l:first = 1
+
+    for l:linter in a:all_linters
+        if !empty(l:linter.aliases)
+            if l:first
+                echom '   Linter Aliases:'
+            endif
+
+            let l:first = 0
+
+            echom string(l:linter.name) . ' -> ' . string(l:linter.aliases)
+        endif
+    endfor
+endfunction
+
 function! ale#debugging#Info() abort
     let l:filetype = &filetype
 
@@ -120,8 +136,8 @@ function! ale#debugging#Info() abort
         call extend(l:all_linters, ale#linter#GetAll(l:aliased_filetype))
     endfor
 
-    let l:all_names = map(l:all_linters, 'v:val[''name'']')
-    let l:enabled_names = map(l:enabled_linters, 'v:val[''name'']')
+    let l:all_names = map(copy(l:all_linters), 'v:val[''name'']')
+    let l:enabled_names = map(copy(l:enabled_linters), 'v:val[''name'']')
 
     " Load linter variables to display
     " This must be done after linters are loaded.
@@ -129,6 +145,7 @@ function! ale#debugging#Info() abort
 
     echom ' Current Filetype: ' . l:filetype
     echom 'Available Linters: ' . string(l:all_names)
+    call s:EchoLinterAliases(l:all_linters)
     echom '  Enabled Linters: ' . string(l:enabled_names)
     echom ' Linter Variables:'
     echom ''

autoload/ale/engine.vim

@@ -7,7 +7,10 @@
 " linter: The linter dictionary for the job.
 " buffer: The buffer number for the job.
 " output: The array of lines for the output of the job.
-let s:job_info_map = {}
+if !has_key(s:, 'job_info_map')
+    let s:job_info_map = {}
+endif
+
 let s:executable_cache_map = {}
 
 " Check if files are executable, and if they are, remember that they are
@@ -26,184 +29,24 @@ function! s:IsExecutable(executable) abort
     return  0
 endfunction
 
-function! ale#engine#ParseVim8ProcessID(job_string) abort
-    return matchstr(a:job_string, '\d\+') + 0
-endfunction
-
-function! s:GetJobID(job) abort
-    if has('nvim')
-        "In NeoVim, job values are just IDs.
-        return a:job
-    endif
-
-    " For Vim 8, the job is a different variable type, and we can parse the
-    " process ID from the string.
-    return ale#engine#ParseVim8ProcessID(string(a:job))
-endfunction
-
 function! ale#engine#InitBufferInfo(buffer) abort
     if !has_key(g:ale_buffer_info, a:buffer)
         " job_list will hold the list of jobs
         " loclist holds the loclist items after all jobs have completed.
-        " lint_file_loclist holds items from the last run including linters
-        "   which use the lint_file option.
-        " new_loclist holds loclist items while jobs are being run.
         " temporary_file_list holds temporary files to be cleaned up
         " temporary_directory_list holds temporary directories to be cleaned up
         " history holds a list of previously run commands for this buffer
         let g:ale_buffer_info[a:buffer] = {
         \   'job_list': [],
         \   'loclist': [],
-        \   'lint_file_loclist': [],
-        \   'new_loclist': [],
         \   'temporary_file_list': [],
         \   'temporary_directory_list': [],
         \   'history': [],
+        \   'open_lsp_documents': [],
         \}
     endif
 endfunction
 
-" A map from timer IDs to Vim 8 jobs, for tracking jobs that need to be killed
-" with SIGKILL if they don't terminate right away.
-let s:job_kill_timers = {}
-
-" Check if a job is still running, in either Vim version.
-function! s:IsJobRunning(job) abort
-    if has('nvim')
-        try
-            " In NeoVim, if the job isn't running, jobpid() will throw.
-            call jobpid(a:job)
-            return 1
-        catch
-        endtry
-
-        return 0
-    endif
-
-    return job_status(a:job) ==# 'run'
-endfunction
-
-function! s:KillHandler(timer) abort
-    let l:job = remove(s:job_kill_timers, a:timer)
-
-    " For NeoVim, we have to send SIGKILL ourselves manually, as NeoVim
-    " doesn't do it properly.
-    if has('nvim')
-        let l:pid = 0
-
-        " We can fail to get the PID here if the job manages to stop already.
-        try
-            let l:pid = jobpid(l:job)
-        catch
-        endtry
-
-        if l:pid > 0
-            if has('win32')
-                " Windows
-                call system('taskkill /pid ' . l:pid . ' /f')
-            else
-                " Linux, Mac OSX, etc.
-                call system('kill -9 ' . l:pid)
-            endif
-        endif
-    else
-        call job_stop(l:job, 'kill')
-    endif
-endfunction
-
-function! ale#engine#ClearJob(job) abort
-    if get(g:, 'ale_run_synchronously') == 1
-        call remove(s:job_info_map, a:job)
-
-        return
-    endif
-
-    let l:job_id = s:GetJobID(a:job)
-
-    if has('nvim')
-        call jobstop(a:job)
-    else
-        " We must close the channel for reading the buffer if it is open
-        " when stopping a job. Otherwise, we will get errors in the status line.
-        if ch_status(job_getchannel(a:job)) ==# 'open'
-            call ch_close_in(job_getchannel(a:job))
-        endif
-
-        " Ask nicely for the job to stop.
-        call job_stop(a:job)
-    endif
-
-    " If a job doesn't stop immediately, queue a timer which will
-    " send SIGKILL to the job, if it's alive by the time the timer ticks.
-    if s:IsJobRunning(a:job)
-        let s:job_kill_timers[timer_start(100, function('s:KillHandler'))] = a:job
-    endif
-
-    if has_key(s:job_info_map, l:job_id)
-        call remove(s:job_info_map, l:job_id)
-    endif
-endfunction
-
-function! s:StopPreviousJobs(buffer, linter) abort
-    if !has_key(g:ale_buffer_info, a:buffer)
-        " Do nothing if we didn't run anything for the buffer.
-        return
-    endif
-
-    let l:new_job_list = []
-
-    for l:job in g:ale_buffer_info[a:buffer].job_list
-        let l:job_id = s:GetJobID(l:job)
-
-        if has_key(s:job_info_map, l:job_id)
-        \&& s:job_info_map[l:job_id].linter.name ==# a:linter.name
-            " Stop jobs which match the buffer and linter.
-            call ale#engine#ClearJob(l:job)
-        else
-            " Keep other jobs in the list.
-            call add(l:new_job_list, l:job)
-        endif
-    endfor
-
-    " Update the list, removing the previously run job.
-    let g:ale_buffer_info[a:buffer].job_list = l:new_job_list
-endfunction
-
-function! s:GatherOutputVim(channel, data) abort
-    let l:job_id = s:GetJobID(ch_getjob(a:channel))
-
-    if !has_key(s:job_info_map, l:job_id)
-        return
-    endif
-
-    call add(s:job_info_map[l:job_id].output, a:data)
-endfunction
-
-function! s:GatherOutputNeoVim(job, data, event) abort
-    let l:job_id = s:GetJobID(a:job)
-
-    if !has_key(s:job_info_map, l:job_id)
-        return
-    endif
-
-    " Join the lines passed to ale, because Neovim splits them up.
-    " a:data is a list of strings, where every item is a new line, except the
-    " first one, which is the continuation of the last item passed last time.
-    call ale#engine#JoinNeovimOutput(s:job_info_map[l:job_id].output, a:data)
-endfunction
-
-function! ale#engine#JoinNeovimOutput(output, data) abort
-    if empty(a:output)
-        call extend(a:output, a:data)
-    else
-        " Extend the previous line, which can be continued.
-        let a:output[-1] .= get(a:data, 0, '')
-
-        " Add the new lines.
-        call extend(a:output, a:data[1:])
-    endif
-endfunction
-
 " Register a temporary file to be managed with the ALE engine for
 " a current job run.
 function! ale#engine#ManageFile(buffer, filename) abort
@@ -255,27 +98,76 @@ function! ale#engine#RemoveManagedFiles(buffer) abort
     let g:ale_buffer_info[a:buffer].temporary_directory_list = []
 endfunction
 
-function! s:HandleExit(job) abort
-    if a:job ==# 'no process'
-        " Stop right away when the job is not valid in Vim 8.
+function! s:GatherOutput(job_id, line) abort
+    if has_key(s:job_info_map, a:job_id)
+        call add(s:job_info_map[a:job_id].output, a:line)
+    endif
+endfunction
+
+function! s:HandleLoclist(linter_name, buffer, loclist) abort
+    " Make some adjustments to the loclists to fix common problems, and also
+    " to set default values for loclist items.
+    let l:linter_loclist = ale#engine#FixLocList(a:buffer, a:linter_name, a:loclist)
+
+    " Remove previous items for this linter.
+    call filter(g:ale_buffer_info[a:buffer].loclist, 'v:val.linter_name !=# a:linter_name')
+    " Add the new items.
+    call extend(g:ale_buffer_info[a:buffer].loclist, l:linter_loclist)
+
+    " Sort the loclist again.
+    " We need a sorted list so we can run a binary search against it
+    " for efficient lookup of the messages in the cursor handler.
+    call sort(g:ale_buffer_info[a:buffer].loclist, 'ale#util#LocItemCompare')
+
+    let l:linting_is_done = empty(g:ale_buffer_info[a:buffer].job_list)
+    \   && !get(g:ale_buffer_info[a:buffer], 'waiting_for_tsserver', 0)
+
+    if l:linting_is_done
+        " Automatically remove all managed temporary files and directories
+        " now that all jobs have completed.
+        call ale#engine#RemoveManagedFiles(a:buffer)
+
+        " Figure out which linters are still enabled, and remove
+        " problems for linters which are no longer enabled.
+        let l:name_map = {}
+
+        for l:linter in ale#linter#Get(getbufvar(a:buffer, '&filetype'))
+            let l:name_map[l:linter.name] = 1
+        endfor
+
+        call filter(
+        \   g:ale_buffer_info[a:buffer].loclist,
+        \   'get(l:name_map, v:val.linter_name)',
+        \)
+    endif
+
+    call ale#engine#SetResults(a:buffer, g:ale_buffer_info[a:buffer].loclist)
+
+    if l:linting_is_done
+        " Call user autocommands. This allows users to hook into ALE's lint cycle.
+        silent doautocmd User ALELint
+    endif
+endfunction
+
+function! s:HandleExit(job_id, exit_code) abort
+    if !has_key(s:job_info_map, a:job_id)
         return
     endif
 
-    let l:job_id = s:GetJobID(a:job)
-
-    if !has_key(s:job_info_map, l:job_id)
-        return
-    endif
-
-    let l:job_info = s:job_info_map[l:job_id]
+    let l:job_info = s:job_info_map[a:job_id]
     let l:linter = l:job_info.linter
     let l:output = l:job_info.output
     let l:buffer = l:job_info.buffer
     let l:next_chain_index = l:job_info.next_chain_index
 
-    " Call the same function for stopping jobs again to clean up the job
-    " which just closed.
-    call s:StopPreviousJobs(l:buffer, l:linter)
+    if g:ale_history_enabled
+        call ale#history#SetExitCode(l:buffer, a:job_id, a:exit_code)
+    endif
+
+    " Remove this job from the list.
+    call ale#job#Stop(a:job_id)
+    call remove(s:job_info_map, a:job_id)
+    call filter(g:ale_buffer_info[l:buffer].job_list, 'v:val !=# a:job_id')
 
     " Stop here if we land in the handle for a job completing if we're in
     " a sandbox.
@@ -283,6 +175,10 @@ function! s:HandleExit(job) abort
         return
     endif
 
+    if has('nvim') && !empty(l:output) && empty(l:output[-1])
+        call remove(l:output, -1)
+    endif
+
     if l:next_chain_index < len(get(l:linter, 'command_chain', []))
         call s:InvokeChain(l:buffer, l:linter, l:next_chain_index, l:output)
         return
@@ -290,62 +186,59 @@ function! s:HandleExit(job) abort
 
     " Log the output of the command for ALEInfo if we should.
     if g:ale_history_enabled && g:ale_history_log_output
-        call ale#history#RememberOutput(l:buffer, l:job_id, l:output[:])
+        call ale#history#RememberOutput(l:buffer, a:job_id, l:output[:])
     endif
 
-    let l:linter_loclist = ale#util#GetFunction(l:linter.callback)(l:buffer, l:output)
+    let l:loclist = ale#util#GetFunction(l:linter.callback)(l:buffer, l:output)
 
-    " Make some adjustments to the loclists to fix common problems, and also
-    " to set default values for loclist items.
-    let l:linter_loclist = ale#engine#FixLocList(l:buffer, l:linter, l:linter_loclist)
+    call s:HandleLoclist(l:linter.name, l:buffer, l:loclist)
+endfunction
 
-    " Add the loclist items from the linter.
-    " loclist items for files which are checked go into a different list,
-    " and are kept between runs.
-    if l:linter.lint_file
-        call extend(g:ale_buffer_info[l:buffer].lint_file_loclist, l:linter_loclist)
-    else
-        call extend(g:ale_buffer_info[l:buffer].new_loclist, l:linter_loclist)
-    endif
+function! s:HandleLSPResponse(response) abort
+    let l:is_diag_response = get(a:response, 'type', '') ==# 'event'
+    \   && get(a:response, 'event', '') ==# 'semanticDiag'
 
-    if !empty(g:ale_buffer_info[l:buffer].job_list)
-        " Wait for all jobs to complete before doing anything else.
+    if !l:is_diag_response
         return
     endif
 
-    " Automatically remove all managed temporary files and directories
-    " now that all jobs have completed.
-    call ale#engine#RemoveManagedFiles(l:buffer)
+    let l:buffer = bufnr(a:response.body.file)
 
-    " Combine the lint_file List and the List for everything else.
-    let l:combined_list = g:ale_buffer_info[l:buffer].lint_file_loclist
-    \   + g:ale_buffer_info[l:buffer].new_loclist
+    let l:info = get(g:ale_buffer_info, l:buffer, {})
 
-    " Sort the loclist again.
-    " We need a sorted list so we can run a binary search against it
-    " for efficient lookup of the messages in the cursor handler.
-    call sort(l:combined_list, 'ale#util#LocItemCompare')
+    if empty(l:info)
+        return
+    endif
 
-    " Now swap the old and new loclists, after we have collected everything
-    " and sorted the list again.
-    let g:ale_buffer_info[l:buffer].loclist = l:combined_list
-    let g:ale_buffer_info[l:buffer].new_loclist = []
+    let l:info.waiting_for_tsserver = 0
 
-    call ale#engine#SetResults(l:buffer, g:ale_buffer_info[l:buffer].loclist)
+    let l:loclist = ale#lsp#response#ReadTSServerDiagnostics(a:response)
 
-    " Call user autocommands. This allows users to hook into ALE's lint cycle.
-    silent doautocmd User ALELint
+    call s:HandleLoclist('tsserver', l:buffer, l:loclist)
 endfunction
 
 function! ale#engine#SetResults(buffer, loclist) abort
+    let l:info = get(g:ale_buffer_info, a:buffer, {})
+    let l:job_list = get(l:info, 'job_list', [])
+    let l:waiting_for_tsserver = get(l:info, 'waiting_for_tsserver', 0)
+    let l:linting_is_done = empty(l:job_list) && !l:waiting_for_tsserver
+
     " Set signs first. This could potentially fix some line numbers.
     " The List could be sorted again here by SetSigns.
     if g:ale_set_signs
         call ale#sign#SetSigns(a:buffer, a:loclist)
+
+        if l:linting_is_done
+            call ale#sign#RemoveDummySignIfNeeded(a:buffer)
+        endif
     endif
 
     if g:ale_set_quickfix || g:ale_set_loclist
         call ale#list#SetLists(a:buffer, a:loclist)
+
+        if l:linting_is_done
+            call ale#list#CloseWindowIfNeeded(a:buffer)
+        endif
     endif
 
     if exists('*ale#statusline#Update')
@@ -364,37 +257,29 @@ function! ale#engine#SetResults(buffer, loclist) abort
     endif
 endfunction
 
-function! s:SetExitCode(job, exit_code) abort
-    let l:job_id = s:GetJobID(a:job)
+function! s:RemapItemTypes(type_map, loclist) abort
+    for l:item in a:loclist
+        let l:key = l:item.type
+        \   . (get(l:item, 'sub_type', '') ==# 'style' ? 'S' : '')
+        let l:new_key = get(a:type_map, l:key, '')
 
-    if !has_key(s:job_info_map, l:job_id)
-        return
-    endif
+        if l:new_key ==# 'E'
+        \|| l:new_key ==# 'ES'
+        \|| l:new_key ==# 'W'
+        \|| l:new_key ==# 'WS'
+        \|| l:new_key ==# 'I'
+            let l:item.type = l:new_key[0]
 
-    let l:buffer = s:job_info_map[l:job_id].buffer
-
-    call ale#history#SetExitCode(l:buffer, l:job_id, a:exit_code)
+            if l:new_key ==# 'ES' || l:new_key ==# 'WS'
+                let l:item.sub_type = 'style'
+            elseif has_key(l:item, 'sub_type')
+                call remove(l:item, 'sub_type')
+            endif
+        endif
+    endfor
 endfunction
 
-function! s:HandleExitNeoVim(job, exit_code, event) abort
-    if g:ale_history_enabled
-        call s:SetExitCode(a:job, a:exit_code)
-    endif
-
-    call s:HandleExit(a:job)
-endfunction
-
-function! s:HandleExitVim(channel) abort
-    call s:HandleExit(ch_getjob(a:channel))
-endfunction
-
-" Vim returns the exit status with one callback,
-" and the channel will close later in another callback.
-function! s:HandleExitStatusVim(job, exit_code) abort
-    call s:SetExitCode(a:job, a:exit_code)
-endfunction
-
-function! ale#engine#FixLocList(buffer, linter, loclist) abort
+function! ale#engine#FixLocList(buffer, linter_name, loclist) abort
     let l:new_loclist = []
 
     " Some errors have line numbers beyond the end of the file,
@@ -423,15 +308,28 @@ function! ale#engine#FixLocList(buffer, linter, loclist) abort
         \   'vcol': get(l:old_item, 'vcol', 0),
         \   'type': get(l:old_item, 'type', 'E'),
         \   'nr': get(l:old_item, 'nr', -1),
-        \   'linter_name': a:linter.name,
+        \   'linter_name': a:linter_name,
         \}
 
         if has_key(l:old_item, 'detail')
             let l:item.detail = l:old_item.detail
         endif
 
-        if l:item.lnum == 0
-            " When errors appear at line 0, put them at line 1 instead.
+        " Pass on a end_col key if set, used for highlights.
+        if has_key(l:old_item, 'end_col')
+            let l:item.end_col = str2nr(l:old_item.end_col)
+        endif
+
+        if has_key(l:old_item, 'end_lnum')
+            let l:item.end_lnum = str2nr(l:old_item.end_lnum)
+        endif
+
+        if has_key(l:old_item, 'sub_type')
+            let l:item.sub_type = l:old_item.sub_type
+        endif
+
+        if l:item.lnum < 1
+            " When errors appear before line 1, put them at line 1.
             let l:item.lnum = 1
         elseif l:item.lnum > l:last_line_number
             " When errors go beyond the end of the file, put them at the end.
@@ -441,6 +339,12 @@ function! ale#engine#FixLocList(buffer, linter, loclist) abort
         call add(l:new_loclist, l:item)
     endfor
 
+    let l:type_map = get(ale#Var(a:buffer, 'type_map'), a:linter_name, {})
+
+    if !empty(l:type_map)
+        call s:RemapItemTypes(l:type_map, l:new_loclist)
+    endif
+
     return l:new_loclist
 endfunction
 
@@ -450,52 +354,6 @@ function! ale#engine#EscapeCommandPart(command_part) abort
     return substitute(a:command_part, '%', '%%', 'g')
 endfunction
 
-function! s:TemporaryFilename(buffer) abort
-    let l:filename = fnamemodify(bufname(a:buffer), ':t')
-
-    if empty(l:filename)
-        " If the buffer's filename is empty, create a dummy filename.
-        let l:ft = getbufvar(a:buffer, '&filetype')
-        let l:filename = 'file' . ale#filetypes#GuessExtension(l:ft)
-    endif
-
-    " Create a temporary filename, <temp_dir>/<original_basename>
-    " The file itself will not be created by this function.
-    return tempname() . (has('win32') ? '\' : '/') . l:filename
-endfunction
-
-" Given a command string, replace every...
-" %s -> with the current filename
-" %t -> with the name of an unused file in a temporary directory
-" %% -> with a literal %
-function! ale#engine#FormatCommand(buffer, command) abort
-    let l:temporary_file = ''
-    let l:command = a:command
-
-    " First replace all uses of %%, used for literal percent characters,
-    " with an ugly string.
-    let l:command = substitute(l:command, '%%', '<<PERCENTS>>', 'g')
-
-    " Replace all %s occurences in the string with the name of the current
-    " file.
-    if l:command =~# '%s'
-        let l:filename = fnamemodify(bufname(a:buffer), ':p')
-        let l:command = substitute(l:command, '%s', '\=shellescape(l:filename)', 'g')
-    endif
-
-    if l:command =~# '%t'
-        " Create a temporary filename, <temp_dir>/<original_basename>
-        " The file itself will not be created by this function.
-        let l:temporary_file = s:TemporaryFilename(a:buffer)
-        let l:command = substitute(l:command, '%t', '\=shellescape(l:temporary_file)', 'g')
-    endif
-
-    " Finish formatting so %% becomes %.
-    let l:command = substitute(l:command, '<<PERCENTS>>', '%', 'g')
-
-    return [l:temporary_file, l:command]
-endfunction
-
 function! s:CreateTemporaryFileForJob(buffer, temporary_file) abort
     if empty(a:temporary_file)
         " There is no file, so we didn't create anything.
@@ -522,15 +380,7 @@ function! s:RunJob(options) abort
     let l:next_chain_index = a:options.next_chain_index
     let l:read_buffer = a:options.read_buffer
 
-    let [l:temporary_file, l:command] = ale#engine#FormatCommand(l:buffer, l:command)
-
-    if l:read_buffer && empty(l:temporary_file)
-        " If we are to send the Vim buffer to a command, we'll do it
-        " in the shell. We'll write out the file to a temporary file,
-        " and then read it back in, in the shell.
-        let l:temporary_file = s:TemporaryFilename(l:buffer)
-        let l:command = l:command . ' < ' . shellescape(l:temporary_file)
-    endif
+    let [l:temporary_file, l:command] = ale#command#FormatCommand(l:buffer, l:command, l:read_buffer)
 
     if s:CreateTemporaryFileForJob(l:buffer, l:temporary_file)
         " If a temporary filename has been formatted in to the command, then
@@ -538,85 +388,51 @@ function! s:RunJob(options) abort
         let l:read_buffer = 0
     endif
 
-    if !has('nvim')
-        " The command will be executed in a subshell. This fixes a number of
-        " issues, including reading the PATH variables correctly, %PATHEXT%
-        " expansion on Windows, etc.
-        "
-        " NeoVim handles this issue automatically if the command is a String.
-        let l:command = has('win32')
-        \   ?  'cmd /c ' . l:command
-        \   : split(&shell) + split(&shellcmdflag) + [l:command]
+    " Add a newline to commands which need it.
+    " This is only used for Flow for now, and is not documented.
+    if l:linter.add_newline
+        if has('win32')
+            let l:command = l:command . '; echo.'
+        else
+            let l:command = l:command . '; echo'
+        endif
+    endif
+
+    let l:command = ale#job#PrepareCommand(l:command)
+    let l:job_options = {
+    \   'mode': 'nl',
+    \   'exit_cb': function('s:HandleExit'),
+    \}
+
+    if l:output_stream ==# 'stderr'
+        let l:job_options.err_cb = function('s:GatherOutput')
+    elseif l:output_stream ==# 'both'
+        let l:job_options.out_cb = function('s:GatherOutput')
+        let l:job_options.err_cb = function('s:GatherOutput')
+    else
+        let l:job_options.out_cb = function('s:GatherOutput')
     endif
 
     if get(g:, 'ale_run_synchronously') == 1
         " Find a unique Job value to use, which will be the same as the ID for
         " running commands synchronously. This is only for test code.
-        let l:job = len(s:job_info_map) + 1
+        let l:job_id = len(s:job_info_map) + 1
 
-        while has_key(s:job_info_map, l:job)
-            let l:job += 1
+        while has_key(s:job_info_map, l:job_id)
+            let l:job_id += 1
         endwhile
-    elseif has('nvim')
-        if l:output_stream ==# 'stderr'
-            " Read from stderr instead of stdout.
-            let l:job = jobstart(l:command, {
-            \   'on_stderr': function('s:GatherOutputNeoVim'),
-            \   'on_exit': function('s:HandleExitNeoVim'),
-            \})
-        elseif l:output_stream ==# 'both'
-            let l:job = jobstart(l:command, {
-            \   'on_stdout': function('s:GatherOutputNeoVim'),
-            \   'on_stderr': function('s:GatherOutputNeoVim'),
-            \   'on_exit': function('s:HandleExitNeoVim'),
-            \})
-        else
-            let l:job = jobstart(l:command, {
-            \   'on_stdout': function('s:GatherOutputNeoVim'),
-            \   'on_exit': function('s:HandleExitNeoVim'),
-            \})
-        endif
     else
-        let l:job_options = {
-        \   'in_mode': 'nl',
-        \   'out_mode': 'nl',
-        \   'err_mode': 'nl',
-        \   'close_cb': function('s:HandleExitVim'),
-        \}
-
-        if g:ale_history_enabled
-            " We only need to capture the exit status if we are going to
-            " save it in the history. Otherwise, we don't care.
-            let l:job_options.exit_cb = function('s:HandleExitStatusVim')
-        endif
-
-        if l:output_stream ==# 'stderr'
-            " Read from stderr instead of stdout.
-            let l:job_options.err_cb = function('s:GatherOutputVim')
-        elseif l:output_stream ==# 'both'
-            " Read from both streams.
-            let l:job_options.out_cb = function('s:GatherOutputVim')
-            let l:job_options.err_cb = function('s:GatherOutputVim')
-        else
-            let l:job_options.out_cb = function('s:GatherOutputVim')
-        endif
-
-        " Vim 8 will read the stdin from the file's buffer.
-        let l:job = job_start(l:command, l:job_options)
+        let l:job_id = ale#job#Start(l:command, l:job_options)
     endif
 
     let l:status = 'failed'
-    let l:job_id = 0
 
     " Only proceed if the job is being run.
-    if has('nvim')
-    \ || get(g:, 'ale_run_synchronously') == 1
-    \ || (l:job !=# 'no process' && job_status(l:job) ==# 'run')
+    if l:job_id
         " Add the job to the list of jobs, so we can track them.
-        call add(g:ale_buffer_info[l:buffer].job_list, l:job)
+        call add(g:ale_buffer_info[l:buffer].job_list, l:job_id)
 
         let l:status = 'started'
-        let l:job_id = s:GetJobID(l:job)
         " Store the ID for the job in the map to read back again.
         let s:job_info_map[l:job_id] = {
         \   'linter': l:linter,
@@ -636,10 +452,11 @@ function! s:RunJob(options) abort
         " Run a command synchronously if this test option is set.
         let s:job_info_map[l:job_id].output = systemlist(
         \   type(l:command) == type([])
-        \   ?  join(l:command[0:1]) . ' ' . shellescape(l:command[2])
+        \   ?  join(l:command[0:1]) . ' ' . ale#Escape(l:command[2])
         \   : l:command
         \)
-        call s:HandleExit(l:job)
+
+        call l:job_options.exit_cb(l:job_id, v:shell_error)
     endif
 endfunction
 
@@ -730,17 +547,87 @@ function! s:InvokeChain(buffer, linter, chain_index, input) abort
     endif
 endfunction
 
+function! ale#engine#StopCurrentJobs(buffer, include_lint_file_jobs) abort
+    let l:info = get(g:ale_buffer_info, a:buffer, {})
+    let l:new_job_list = []
+
+    for l:job_id in get(l:info, 'job_list', [])
+        let l:job_info = get(s:job_info_map, l:job_id, {})
+
+        if !empty(l:job_info)
+            if a:include_lint_file_jobs || !l:job_info.linter.lint_file
+                call ale#job#Stop(l:job_id)
+                call remove(s:job_info_map, l:job_id)
+            else
+                call add(l:new_job_list, l:job_id)
+            endif
+        endif
+    endfor
+
+    " Update the List, so it includes only the jobs we still need.
+    let l:info.job_list = l:new_job_list
+    " Ignore current LSP commands.
+    " We should consider cancelling them in future.
+    let l:info.lsp_command_list = []
+endfunction
+
+function! s:CheckWithTSServer(buffer, linter, executable) abort
+    let l:info = g:ale_buffer_info[a:buffer]
+    let l:open_documents = l:info.open_lsp_documents
+    let l:is_open = index(l:open_documents, a:linter.name) >= 0
+
+    let l:command = ale#job#PrepareCommand(a:executable)
+    let l:job_id = ale#lsp#StartProgram(a:executable, l:command, function('s:HandleLSPResponse'))
+
+    if !l:job_id
+        if g:ale_history_enabled
+            call ale#history#Add(a:buffer, 'failed', l:job_id, l:command)
+        endif
+
+        return
+    endif
+
+    if !l:is_open
+        if g:ale_history_enabled
+            call ale#history#Add(a:buffer, 'started', l:job_id, l:command)
+        endif
+
+        call add(l:open_documents, a:linter.name)
+        call ale#lsp#SendMessageToProgram(
+        \   a:executable,
+        \   ale#lsp#tsserver_message#Open(a:buffer),
+        \)
+    endif
+
+    call ale#lsp#SendMessageToProgram(
+    \   a:executable,
+    \   ale#lsp#tsserver_message#Change(a:buffer),
+    \)
+
+    let l:request_id = ale#lsp#SendMessageToProgram(
+    \   a:executable,
+    \   ale#lsp#tsserver_message#Geterr(a:buffer),
+    \)
+
+    if l:request_id != 0
+        let l:info.waiting_for_tsserver = 1
+    endif
+endfunction
+
 function! ale#engine#Invoke(buffer, linter) abort
-    " Stop previous jobs for the same linter.
-    call s:StopPreviousJobs(a:buffer, a:linter)
+    if empty(a:linter.lsp) || a:linter.lsp ==# 'tsserver'
+        let l:executable = has_key(a:linter, 'executable_callback')
+        \   ? ale#util#GetFunction(a:linter.executable_callback)(a:buffer)
+        \   : a:linter.executable
 
-    let l:executable = has_key(a:linter, 'executable_callback')
-    \   ? ale#util#GetFunction(a:linter.executable_callback)(a:buffer)
-    \   : a:linter.executable
-
-    " Run this program if it can be executed.
-    if s:IsExecutable(l:executable)
-        call s:InvokeChain(a:buffer, a:linter, 0, [])
+        " Run this program if it can be executed.
+        if s:IsExecutable(l:executable)
+            if a:linter.lsp ==# 'tsserver'
+                call s:CheckWithTSServer(a:buffer, a:linter, l:executable)
+            else
+                call s:InvokeChain(a:buffer, a:linter, 0, [])
+            endif
+        endif
     endif
 endfunction
 
@@ -773,13 +660,24 @@ function! ale#engine#WaitForJobs(deadline) abort
         call extend(l:job_list, l:info.job_list)
     endfor
 
+    " NeoVim has a built-in API for this, so use that.
+    if has('nvim')
+        let l:nvim_code_list = jobwait(l:job_list, a:deadline)
+
+        if index(l:nvim_code_list, -1) >= 0
+            throw 'Jobs did not complete on time!'
+        endif
+
+        return
+    endif
+
     let l:should_wait_more = 1
 
     while l:should_wait_more
         let l:should_wait_more = 0
 
-        for l:job in l:job_list
-            if job_status(l:job) ==# 'run'
+        for l:job_id in l:job_list
+            if ale#job#IsRunning(l:job_id)
                 let l:now = ale#util#ClockMilliseconds()
 
                 if l:now - l:start_time > a:deadline
@@ -807,8 +705,8 @@ function! ale#engine#WaitForJobs(deadline) abort
 
     " Check again to see if any jobs are running.
     for l:info in values(g:ale_buffer_info)
-        for l:job in l:info.job_list
-            if job_status(l:job) ==# 'run'
+        for l:job_id in l:info.job_list
+            if ale#job#IsRunning(l:job_id)
                 let l:has_new_jobs = 1
                 break
             endif

autoload/ale/events.vim

@@ -0,0 +1,33 @@
+" Author: w0rp <devw0rp@gmail.com>
+
+function! ale#events#SaveEvent() abort
+    let l:should_lint = g:ale_enabled && g:ale_lint_on_save
+
+    if g:ale_fix_on_save
+        let l:will_fix = ale#fix#Fix('save_file')
+        let l:should_lint = l:should_lint && !l:will_fix
+    endif
+
+    if l:should_lint
+        call ale#Queue(0, 'lint_file')
+    endif
+endfunction
+
+function! s:LintOnEnter() abort
+    if g:ale_enabled && g:ale_lint_on_enter && has_key(b:, 'ale_file_changed')
+        call remove(b:, 'ale_file_changed')
+        call ale#Queue(0, 'lint_file')
+    endif
+endfunction
+
+function! ale#events#EnterEvent() abort
+    call s:LintOnEnter()
+endfunction
+
+function! ale#events#FileChangedEvent(buffer) abort
+    call setbufvar(a:buffer, 'ale_file_changed', 1)
+
+    if bufnr('') == a:buffer
+        call s:LintOnEnter()
+    endif
+endfunction

autoload/ale/fix.vim

@@ -0,0 +1,378 @@
+" This global Dictionary tracks the ALE fix data for jobs, etc.
+" This Dictionary should not be accessed outside of the plugin. It is only
+" global so it can be modified in Vader tests.
+if !has_key(g:, 'ale_fix_buffer_data')
+    let g:ale_fix_buffer_data = {}
+endif
+
+if !has_key(s:, 'job_info_map')
+    let s:job_info_map = {}
+endif
+
+function! s:GatherOutput(job_id, line) abort
+    if has_key(s:job_info_map, a:job_id)
+        call add(s:job_info_map[a:job_id].output, a:line)
+    endif
+endfunction
+
+" Apply fixes queued up for buffers which may be hidden.
+" Vim doesn't let you modify hidden buffers.
+function! ale#fix#ApplyQueuedFixes() abort
+    let l:buffer = bufnr('')
+    let l:data = get(g:ale_fix_buffer_data, l:buffer, {'done': 0})
+
+    if !l:data.done
+        return
+    endif
+
+    call remove(g:ale_fix_buffer_data, l:buffer)
+
+    if l:data.changes_made
+        call setline(1, l:data.output)
+
+        let l:start_line = len(l:data.output) + 1
+        let l:end_line = len(l:data.lines_before)
+
+        if l:end_line >= l:start_line
+            let l:save = winsaveview()
+            silent execute l:start_line . ',' . l:end_line . 'd'
+            call winrestview(l:save)
+        endif
+
+        if l:data.should_save
+            if empty(&buftype)
+                noautocmd :w!
+            else
+                call writefile(l:data.output, 'fix_test_file')
+                set nomodified
+            endif
+        endif
+    endif
+
+    if l:data.should_save
+        let l:should_lint = g:ale_fix_on_save
+    else
+        let l:should_lint = l:data.changes_made
+    endif
+
+    " If ALE linting is enabled, check for problems with the file again after
+    " fixing problems.
+    if g:ale_enabled && l:should_lint
+        call ale#Queue(0, l:data.should_save ? 'lint_file' : '')
+    endif
+endfunction
+
+function! ale#fix#ApplyFixes(buffer, output) abort
+    call ale#fix#RemoveManagedFiles(a:buffer)
+
+    let l:data = g:ale_fix_buffer_data[a:buffer]
+    let l:data.output = a:output
+    let l:data.changes_made = l:data.lines_before != l:data.output
+
+    if l:data.changes_made && bufexists(a:buffer)
+        let l:lines = getbufline(a:buffer, 1, '$')
+
+        if l:data.lines_before != l:lines
+            call remove(g:ale_fix_buffer_data, a:buffer)
+            echoerr 'The file was changed before fixing finished'
+            return
+        endif
+    endif
+
+    if !bufexists(a:buffer)
+        " Remove the buffer data when it doesn't exist.
+        call remove(g:ale_fix_buffer_data, a:buffer)
+    endif
+
+    let l:data.done = 1
+
+    " We can only change the lines of a buffer which is currently open,
+    " so try and apply the fixes to the current buffer.
+    call ale#fix#ApplyQueuedFixes()
+endfunction
+
+function! s:HandleExit(job_id, exit_code) abort
+    if !has_key(s:job_info_map, a:job_id)
+        return
+    endif
+
+    let l:job_info = remove(s:job_info_map, a:job_id)
+
+    if has_key(l:job_info, 'file_to_read')
+        let l:job_info.output = readfile(l:job_info.file_to_read)
+    endif
+
+    " Use the output of the job for changing the file if it isn't empty,
+    " otherwise skip this job and use the input from before.
+    let l:input = !empty(l:job_info.output)
+    \   ? l:job_info.output
+    \   : l:job_info.input
+
+    call s:RunFixer({
+    \   'buffer': l:job_info.buffer,
+    \   'input': l:input,
+    \   'callback_list': l:job_info.callback_list,
+    \   'callback_index': l:job_info.callback_index + 1,
+    \})
+endfunction
+
+function! ale#fix#ManageDirectory(buffer, directory) abort
+    call add(g:ale_fix_buffer_data[a:buffer].temporary_directory_list, a:directory)
+endfunction
+
+function! ale#fix#RemoveManagedFiles(buffer) abort
+    if !has_key(g:ale_fix_buffer_data, a:buffer)
+        return
+    endif
+
+    " We can't delete anything in a sandbox, so wait until we escape from
+    " it to delete temporary files and directories.
+    if ale#util#InSandbox()
+        return
+    endif
+
+    " Delete directories like `rm -rf`.
+    " Directories are handled differently from files, so paths that are
+    " intended to be single files can be set up for automatic deletion without
+    " accidentally deleting entire directories.
+    for l:directory in g:ale_fix_buffer_data[a:buffer].temporary_directory_list
+        call delete(l:directory, 'rf')
+    endfor
+
+    let g:ale_fix_buffer_data[a:buffer].temporary_directory_list = []
+endfunction
+
+function! s:CreateTemporaryFileForJob(buffer, temporary_file, input) abort
+    if empty(a:temporary_file)
+        " There is no file, so we didn't create anything.
+        return 0
+    endif
+
+    let l:temporary_directory = fnamemodify(a:temporary_file, ':h')
+    " Create the temporary directory for the file, unreadable by 'other'
+    " users.
+    call mkdir(l:temporary_directory, '', 0750)
+    " Automatically delete the directory later.
+    call ale#fix#ManageDirectory(a:buffer, l:temporary_directory)
+    " Write the buffer out to a file.
+    call writefile(a:input, a:temporary_file)
+
+    return 1
+endfunction
+
+function! s:RunJob(options) abort
+    let l:buffer = a:options.buffer
+    let l:command = a:options.command
+    let l:input = a:options.input
+    let l:output_stream = a:options.output_stream
+    let l:read_temporary_file = a:options.read_temporary_file
+
+    let [l:temporary_file, l:command] = ale#command#FormatCommand(l:buffer, l:command, 1)
+    call s:CreateTemporaryFileForJob(l:buffer, l:temporary_file, l:input)
+
+    let l:command = ale#job#PrepareCommand(l:command)
+    let l:job_options = {
+    \   'mode': 'nl',
+    \   'exit_cb': function('s:HandleExit'),
+    \}
+
+    let l:job_info = {
+    \   'buffer': l:buffer,
+    \   'input': l:input,
+    \   'output': [],
+    \   'callback_list': a:options.callback_list,
+    \   'callback_index': a:options.callback_index,
+    \}
+
+    if l:read_temporary_file
+        " TODO: Check that a temporary file is set here.
+        let l:job_info.file_to_read = l:temporary_file
+    elseif l:output_stream ==# 'stderr'
+        let l:job_options.err_cb = function('s:GatherOutput')
+    elseif l:output_stream ==# 'both'
+        let l:job_options.out_cb = function('s:GatherOutput')
+        let l:job_options.err_cb = function('s:GatherOutput')
+    else
+        let l:job_options.out_cb = function('s:GatherOutput')
+    endif
+
+    if get(g:, 'ale_emulate_job_failure') == 1
+        let l:job_id = 0
+    elseif get(g:, 'ale_run_synchronously') == 1
+        " Find a unique Job value to use, which will be the same as the ID for
+        " running commands synchronously. This is only for test code.
+        let l:job_id = len(s:job_info_map) + 1
+
+        while has_key(s:job_info_map, l:job_id)
+            let l:job_id += 1
+        endwhile
+    else
+        let l:job_id = ale#job#Start(l:command, l:job_options)
+    endif
+
+    if l:job_id == 0
+        return 0
+    endif
+
+    let s:job_info_map[l:job_id] = l:job_info
+
+    if get(g:, 'ale_run_synchronously') == 1
+        " Run a command synchronously if this test option is set.
+        let l:output = systemlist(
+        \   type(l:command) == type([])
+        \   ?  join(l:command[0:1]) . ' ' . ale#Escape(l:command[2])
+        \   : l:command
+        \)
+
+        if !l:read_temporary_file
+            let s:job_info_map[l:job_id].output = l:output
+        endif
+
+        call l:job_options.exit_cb(l:job_id, v:shell_error)
+    endif
+
+    return 1
+endfunction
+
+function! s:RunFixer(options) abort
+    let l:buffer = a:options.buffer
+    let l:input = a:options.input
+    let l:index = a:options.callback_index
+
+    while len(a:options.callback_list) > l:index
+        let l:Function = a:options.callback_list[l:index]
+
+        let l:result = ale#util#FunctionArgCount(l:Function) == 1
+        \   ? call(l:Function, [l:buffer])
+        \   : call(l:Function, [l:buffer, copy(l:input)])
+
+        if type(l:result) == type(0) && l:result == 0
+            " When `0` is returned, skip this item.
+            let l:index += 1
+        elseif type(l:result) == type([])
+            let l:input = l:result
+            let l:index += 1
+        else
+            let l:job_ran = s:RunJob({
+            \   'buffer': l:buffer,
+            \   'command': l:result.command,
+            \   'input': l:input,
+            \   'output_stream': get(l:result, 'output_stream', 'stdout'),
+            \   'read_temporary_file': get(l:result, 'read_temporary_file', 0),
+            \   'callback_list': a:options.callback_list,
+            \   'callback_index': l:index,
+            \})
+
+            if !l:job_ran
+                " The job failed to run, so skip to the next item.
+                let l:index += 1
+            else
+                " Stop here, we will handle exit later on.
+                return
+            endif
+        endif
+    endwhile
+
+    call ale#fix#ApplyFixes(l:buffer, l:input)
+endfunction
+
+function! s:GetCallbacks() abort
+    let l:fixers = ale#Var(bufnr(''), 'fixers')
+    let l:callback_list = []
+
+    for l:sub_type in split(&filetype, '\.')
+        let l:sub_type_callacks = get(l:fixers, l:sub_type, [])
+
+        if type(l:sub_type_callacks) == type('')
+            call add(l:callback_list, l:sub_type_callacks)
+        else
+            call extend(l:callback_list, l:sub_type_callacks)
+        endif
+    endfor
+
+    if empty(l:callback_list)
+        return []
+    endif
+
+    let l:corrected_list = []
+
+    " Variables with capital characters are needed, or Vim will complain about
+    " funcref variables.
+    for l:Item in l:callback_list
+        if type(l:Item) == type('')
+            let l:Func = ale#fix#registry#GetFunc(l:Item)
+
+            if !empty(l:Func)
+                let l:Item = l:Func
+            endif
+        endif
+
+        call add(l:corrected_list, ale#util#GetFunction(l:Item))
+    endfor
+
+    return l:corrected_list
+endfunction
+
+function! ale#fix#InitBufferData(buffer, fixing_flag) abort
+    " The 'done' flag tells the function for applying changes when fixing
+    " is complete.
+    let g:ale_fix_buffer_data[a:buffer] = {
+    \   'vars': getbufvar(a:buffer, ''),
+    \   'lines_before': getbufline(a:buffer, 1, '$'),
+    \   'filename': expand('#' . a:buffer . ':p'),
+    \   'done': 0,
+    \   'should_save': a:fixing_flag ==# 'save_file',
+    \   'temporary_directory_list': [],
+    \}
+endfunction
+
+" Accepts an optional argument for what to do when fixing.
+"
+" Returns 0 if no fixes can be applied, and 1 if fixing can be done.
+function! ale#fix#Fix(...) abort
+    if len(a:0) > 1
+        throw 'too many arguments!'
+    endif
+
+    let l:fixing_flag = get(a:000, 0, '')
+
+    if l:fixing_flag !=# '' && l:fixing_flag !=# 'save_file'
+        throw "fixing_flag must be either '' or 'save_file'"
+    endif
+
+    let l:callback_list = s:GetCallbacks()
+
+    if empty(l:callback_list)
+        if l:fixing_flag ==# ''
+            echoerr 'No fixers have been defined. Try :ALEFixSuggest'
+        endif
+
+        return 0
+    endif
+
+    let l:buffer = bufnr('')
+
+    for l:job_id in keys(s:job_info_map)
+        call remove(s:job_info_map, l:job_id)
+        call ale#job#Stop(l:job_id)
+    endfor
+
+    " Clean up any files we might have left behind from a previous run.
+    call ale#fix#RemoveManagedFiles(l:buffer)
+    call ale#fix#InitBufferData(l:buffer, l:fixing_flag)
+
+    call s:RunFixer({
+    \   'buffer': l:buffer,
+    \   'input': g:ale_fix_buffer_data[l:buffer].lines_before,
+    \   'callback_index': 0,
+    \   'callback_list': l:callback_list,
+    \})
+
+    return 1
+endfunction
+
+" Set up an autocmd command to try and apply buffer fixes when available.
+augroup ALEBufferFixGroup
+    autocmd!
+    autocmd BufEnter * call ale#fix#ApplyQueuedFixes()
+augroup END

autoload/ale/fix/registry.vim

@@ -0,0 +1,154 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: A registry of functions for fixing things.
+
+let s:default_registry = {
+\   'add_blank_lines_for_python_control_statements': {
+\       'function': 'ale#fixers#generic_python#AddLinesBeforeControlStatements',
+\       'suggested_filetypes': ['python'],
+\       'description': 'Add blank lines before control statements.',
+\   },
+\   'autopep8': {
+\       'function': 'ale#fixers#autopep8#Fix',
+\       'suggested_filetypes': ['python'],
+\       'description': 'Fix PEP8 issues with autopep8.',
+\   },
+\   'eslint': {
+\       'function': 'ale#fixers#eslint#Fix',
+\       'suggested_filetypes': ['javascript', 'typescript'],
+\       'description': 'Apply eslint --fix to a file.',
+\   },
+\   'isort': {
+\       'function': 'ale#fixers#isort#Fix',
+\       'suggested_filetypes': ['python'],
+\       'description': 'Sort Python imports with isort.',
+\   },
+\   'prettier': {
+\       'function': 'ale#fixers#prettier#Fix',
+\       'suggested_filetypes': ['javascript'],
+\       'description': 'Apply prettier to a file.',
+\   },
+\   'prettier_eslint': {
+\       'function': 'ale#fixers#prettier_eslint#Fix',
+\       'suggested_filetypes': ['javascript'],
+\       'description': 'Apply prettier-eslint to a file.',
+\   },
+\   'remove_trailing_lines': {
+\       'function': 'ale#fixers#generic#RemoveTrailingBlankLines',
+\       'suggested_filetypes': [],
+\       'description': 'Remove all blank lines at the end of a file.',
+\   },
+\   'yapf': {
+\       'function': 'ale#fixers#yapf#Fix',
+\       'suggested_filetypes': ['python'],
+\       'description': 'Fix Python files with yapf.',
+\   },
+\   'rubocop': {
+\       'function': 'ale#fixers#rubocop#Fix',
+\       'suggested_filetypes': ['ruby'],
+\       'description': 'Fix ruby files with rubocop --auto-correct.',
+\   },
+\}
+
+" Reset the function registry to the default entries.
+function! ale#fix#registry#ResetToDefaults() abort
+    let s:entries = deepcopy(s:default_registry)
+endfunction
+
+" Set up entries now.
+call ale#fix#registry#ResetToDefaults()
+
+" Remove everything from the registry, useful for tests.
+function! ale#fix#registry#Clear() abort
+    let s:entries = {}
+endfunction
+
+" Add a function for fixing problems to the registry.
+function! ale#fix#registry#Add(name, func, filetypes, desc) abort
+    if type(a:name) != type('')
+        throw '''name'' must be a String'
+    endif
+
+    if type(a:func) != type('')
+        throw '''func'' must be a String'
+    endif
+
+    if type(a:filetypes) != type([])
+        throw '''filetypes'' must be a List'
+    endif
+
+    for l:type in a:filetypes
+        if type(l:type) != type('')
+            throw 'Each entry of ''filetypes'' must be a String'
+        endif
+    endfor
+
+    if type(a:desc) != type('')
+        throw '''desc'' must be a String'
+    endif
+
+    let s:entries[a:name] = {
+    \   'function': a:func,
+    \   'suggested_filetypes': a:filetypes,
+    \   'description': a:desc,
+    \}
+endfunction
+
+" Get a function from the registry by its short name.
+function! ale#fix#registry#GetFunc(name) abort
+    return get(s:entries, a:name, {'function': ''}).function
+endfunction
+
+function! s:ShouldSuggestForType(suggested_filetypes, type_list) abort
+    for l:type in a:type_list
+        if index(a:suggested_filetypes, l:type) >= 0
+            return 1
+        endif
+    endfor
+
+    return 0
+endfunction
+
+" Suggest functions to use from the registry.
+function! ale#fix#registry#Suggest(filetype) abort
+    let l:type_list = split(a:filetype, '\.')
+    let l:first_for_filetype = 1
+    let l:first_generic = 1
+
+    for l:key in sort(keys(s:entries))
+        let l:suggested_filetypes = s:entries[l:key].suggested_filetypes
+
+        if s:ShouldSuggestForType(l:suggested_filetypes, l:type_list)
+            if l:first_for_filetype
+                let l:first_for_filetype = 0
+                echom 'Try the following fixers appropriate for the filetype:'
+                echom ''
+            endif
+
+            echom printf('%s - %s', string(l:key), s:entries[l:key].description)
+        endif
+    endfor
+
+
+    for l:key in sort(keys(s:entries))
+        if empty(s:entries[l:key].suggested_filetypes)
+            if l:first_generic
+                if !l:first_for_filetype
+                    echom ''
+                endif
+
+                let l:first_generic = 0
+                echom 'Try the following generic fixers:'
+                echom ''
+            endif
+
+            echom printf('%s - %s', string(l:key), s:entries[l:key].description)
+        endif
+    endfor
+
+    if l:first_for_filetype && l:first_generic
+        echom 'There is nothing in the registry to suggest.'
+    else
+        echom ''
+        echom 'See :help ale-fix-configuration'
+    endif
+endfunction

autoload/ale/fixers/autopep8.vim

@@ -0,0 +1,26 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Fixing files with autopep8.
+
+call ale#Set('python_autopep8_executable', 'autopep8')
+call ale#Set('python_autopep8_use_global', 0)
+call ale#Set('python_autopep8_options', '')
+
+function! ale#fixers#autopep8#Fix(buffer) abort
+    let l:executable = ale#python#FindExecutable(
+    \   a:buffer,
+    \   'python_autopep8',
+    \   ['/bin/autopep8'],
+    \)
+
+    if !executable(l:executable)
+        return 0
+    endif
+
+    let l:options = ale#Var(a:buffer, 'python_autopep8_options')
+
+    return {
+    \   'command': ale#Escape(l:executable)
+    \       . (!empty(l:options) ? ' ' . l:options : '')
+    \       . ' -',
+    \}
+endfunction

autoload/ale/fixers/eslint.vim

@@ -0,0 +1,37 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Fixing files with eslint.
+
+function! s:FindConfig(buffer) abort
+    for l:filename in [
+    \   '.eslintrc.js',
+    \   '.eslintrc.yaml',
+    \   '.eslintrc.yml',
+    \   '.eslintrc.json',
+    \   '.eslintrc',
+    \   'package.json',
+    \]
+        let l:config = ale#path#FindNearestFile(a:buffer, l:filename)
+
+        if !empty(l:config)
+            return l:config
+        endif
+    endfor
+
+    return ''
+endfunction
+
+function! ale#fixers#eslint#Fix(buffer) abort
+    let l:executable = ale#handlers#eslint#GetExecutable(a:buffer)
+    let l:config = s:FindConfig(a:buffer)
+
+    if empty(l:config)
+        return 0
+    endif
+
+    return {
+    \   'command': ale#Escape(l:executable)
+    \       . ' --config ' . ale#Escape(l:config)
+    \       . ' --fix %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction

autoload/ale/fixers/generic.vim

@@ -0,0 +1,12 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Generic functions for fixing files with.
+
+function! ale#fixers#generic#RemoveTrailingBlankLines(buffer, lines) abort
+    let l:end_index = len(a:lines) - 1
+
+    while l:end_index > 0 && empty(a:lines[l:end_index])
+        let l:end_index -= 1
+    endwhile
+
+    return a:lines[:l:end_index]
+endfunction

autoload/ale/fixers/generic_python.vim

@@ -0,0 +1,25 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Generic fixer functions for Python.
+
+" Add blank lines before control statements.
+function! ale#fixers#generic_python#AddLinesBeforeControlStatements(buffer, lines) abort
+    let l:new_lines = []
+    let l:last_indent_size = 0
+    let l:last_line_is_blank = 0
+
+    for l:line in a:lines
+        let l:indent_size = len(matchstr(l:line, '^ *'))
+
+        if !l:last_line_is_blank
+        \&& l:indent_size <= l:last_indent_size
+        \&& match(l:line, '\v^ *(return|if|for|while|break|continue)') >= 0
+            call add(l:new_lines, '')
+        endif
+
+        call add(l:new_lines, l:line)
+        let l:last_indent_size = l:indent_size
+        let l:last_line_is_blank = empty(split(l:line))
+    endfor
+
+    return l:new_lines
+endfunction

autoload/ale/fixers/isort.vim

@@ -0,0 +1,26 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Fixing Python imports with isort.
+
+call ale#Set('python_isort_executable', 'isort')
+call ale#Set('python_isort_use_global', 0)
+
+function! ale#fixers#isort#Fix(buffer) abort
+    let l:executable = ale#python#FindExecutable(
+    \   a:buffer,
+    \   'python_isort',
+    \   ['/bin/isort'],
+    \)
+
+    if !executable(l:executable)
+        return 0
+    endif
+
+    let l:config = ale#path#FindNearestFile(a:buffer, '.isort.cfg')
+    let l:config_options = !empty(l:config)
+    \   ? ' --settings-path ' . ale#Escape(l:config)
+    \   : ''
+
+    return {
+    \   'command': ale#Escape(l:executable) . l:config_options . ' -',
+    \}
+endfunction

autoload/ale/fixers/prettier.vim

@@ -0,0 +1,26 @@
+" Author: tunnckoCore (Charlike Mike Reagent) <mameto2011@gmail.com>,
+"         w0rp <devw0rp@gmail.com>
+" Description: Integration of Prettier with ALE.
+
+call ale#Set('javascript_prettier_executable', 'prettier')
+call ale#Set('javascript_prettier_use_global', 0)
+call ale#Set('javascript_prettier_options', '')
+
+function! ale#fixers#prettier#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'javascript_prettier', [
+    \   'node_modules/prettier-cli/index.js',
+    \   'node_modules/.bin/prettier',
+    \])
+endfunction
+
+function! ale#fixers#prettier#Fix(buffer) abort
+    let l:options = ale#Var(a:buffer, 'javascript_prettier_options')
+
+    return {
+    \   'command': ale#Escape(ale#fixers#prettier#GetExecutable(a:buffer))
+    \       . ' %t'
+    \       . ' ' . l:options
+    \       . ' --write',
+    \   'read_temporary_file': 1,
+    \}
+endfunction

autoload/ale/fixers/prettier_eslint.vim

@@ -0,0 +1,26 @@
+" Author: tunnckoCore (Charlike Mike Reagent) <mameto2011@gmail.com>,
+"         w0rp <devw0rp@gmail.com>
+" Description: Integration between Prettier and ESLint.
+
+call ale#Set('javascript_prettier_eslint_executable', 'prettier-eslint')
+call ale#Set('javascript_prettier_eslint_use_global', 0)
+call ale#Set('javascript_prettier_eslint_options', '')
+
+function! ale#fixers#prettier_eslint#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'javascript_prettier_eslint', [
+    \   'node_modules/prettier-eslint-cli/index.js',
+    \   'node_modules/.bin/prettier-eslint',
+    \])
+endfunction
+
+function! ale#fixers#prettier_eslint#Fix(buffer, lines) abort
+    let l:options = ale#Var(a:buffer, 'javascript_prettier_eslint_options')
+
+    return {
+    \   'command': ale#Escape(ale#fixers#prettier_eslint#GetExecutable(a:buffer))
+    \       . ' %t'
+    \       . ' ' . l:options
+    \       . ' --write',
+    \   'read_temporary_file': 1,
+    \}
+endfunction

autoload/ale/fixers/rubocop.vim

@@ -0,0 +1,19 @@
+function! ale#fixers#rubocop#GetCommand(buffer) abort
+    let l:executable = ale#handlers#rubocop#GetExecutable(a:buffer)
+    let l:exec_args = l:executable =~? 'bundle$'
+    \   ? ' exec rubocop'
+    \   : ''
+    let l:config = ale#path#FindNearestFile(a:buffer, '.rubocop.yml')
+
+    return ale#Escape(l:executable) . l:exec_args
+    \   . (!empty(l:config) ? ' --config ' . ale#Escape(l:config) : '')
+    \   . ' --auto-correct %t'
+
+endfunction
+
+function! ale#fixers#rubocop#Fix(buffer) abort
+    return {
+    \   'command': ale#fixers#rubocop#GetCommand(a:buffer),
+    \   'read_temporary_file': 1,
+    \}
+endfunction

autoload/ale/fixers/yapf.vim

@@ -0,0 +1,26 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Fixing Python files with yapf.
+
+call ale#Set('python_yapf_executable', 'yapf')
+call ale#Set('python_yapf_use_global', 0)
+
+function! ale#fixers#yapf#Fix(buffer) abort
+    let l:executable = ale#python#FindExecutable(
+    \   a:buffer,
+    \   'python_yapf',
+    \   ['/bin/yapf'],
+    \)
+
+    if !executable(l:executable)
+        return 0
+    endif
+
+    let l:config = ale#path#FindNearestFile(a:buffer, '.style.yapf')
+    let l:config_options = !empty(l:config)
+    \   ? ' --style ' . ale#Escape(l:config)
+    \   : ''
+
+    return {
+    \   'command': ale#Escape(l:executable) . ' --no-local-style' . l:config_options,
+    \}
+endfunction

autoload/ale/handlers/cppcheck.vim

@@ -4,16 +4,17 @@ function! ale#handlers#cppcheck#HandleCppCheckFormat(buffer, lines) abort
     " Look for lines like the following.
     "
     " [test.cpp:5]: (error) Array 'a[10]' accessed at index 10, which is out of bounds
-    let l:pattern = '^\[.\{-}:\(\d\+\)\]: (\(.\{-}\)) \(.\+\)'
+    let l:pattern = '\v^\[(.+):(\d+)\]: \(([a-z]+)\) (.+)$'
     let l:output = []
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
-        call add(l:output, {
-        \   'lnum': l:match[1] + 0,
-        \   'col': 0,
-        \   'text': l:match[3] . ' (' . l:match[2] . ')',
-        \   'type': l:match[2] ==# 'error' ? 'E' : 'W',
-        \})
+        if ale#path#IsBufferPath(a:buffer, l:match[1])
+            call add(l:output, {
+            \   'lnum': str2nr(l:match[2]),
+            \   'type': l:match[3] ==# 'error' ? 'E' : 'W',
+            \   'text': l:match[4],
+            \})
+        endif
     endfor
 
     return l:output

autoload/ale/handlers/cpplint.vim

@@ -0,0 +1,20 @@
+" Author: Dawid Kurek https://github.com/dawikur
+" Description: Handle errors for cpplint.
+
+function! ale#handlers#cpplint#HandleCppLintFormat(buffer, lines) abort
+    " Look for lines like the following.
+    " test.cpp:5:  Estra space after ( in function call [whitespace/parents] [4]
+    let l:pattern = '^.\{-}:\(\d\+\): \(.\+\)'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        call add(l:output, {
+        \   'lnum': l:match[1] + 0,
+        \   'col': 0,
+        \   'text': l:match[2],
+        \   'type': 'W',
+        \})
+    endfor
+
+    return l:output
+endfunction

autoload/ale/handlers/css.vim

@@ -42,7 +42,7 @@ function! ale#handlers#css#HandleStyleLintFormat(buffer, lines) abort
     " src/main.css
     "  108:10  ✖  Unexpected leading zero         number-leading-zero
     "  116:20  ✖  Expected a trailing semicolon   declaration-block-trailing-semicolon
-    let l:pattern = '\v^.* (\d+):(\d+) \s+(\S+)\s+ (.*[^ ])\s+([^ ]+)$'
+    let l:pattern = '\v^.* (\d+):(\d+) \s+(\S+)\s+ (.*[^ ])\s+([^ ]+)\s*$'
     let l:output = []
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)

autoload/ale/handlers/eslint.vim

@@ -0,0 +1,110 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Functions for working with eslint, for checking or fixing files.
+
+call ale#Set('javascript_eslint_options', '')
+call ale#Set('javascript_eslint_executable', 'eslint')
+call ale#Set('javascript_eslint_use_global', 0)
+
+function! ale#handlers#eslint#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'javascript_eslint', [
+    \   'node_modules/.bin/eslint_d',
+    \   'node_modules/eslint/bin/eslint.js',
+    \   'node_modules/.bin/eslint',
+    \])
+endfunction
+
+function! ale#handlers#eslint#GetCommand(buffer) abort
+    let l:executable = ale#handlers#eslint#GetExecutable(a:buffer)
+
+    if ale#Has('win32') && l:executable =~? 'eslint\.js$'
+        " For Windows, if we detect an eslint.js script, we need to execute
+        " it with node, or the file can be opened with a text editor.
+        let l:head = 'node ' . ale#Escape(l:executable)
+    else
+        let l:head = ale#Escape(l:executable)
+    endif
+
+    let l:options = ale#Var(a:buffer, 'javascript_eslint_options')
+
+    return l:head
+    \   . (!empty(l:options) ? ' ' . l:options : '')
+    \   . ' -f unix --stdin --stdin-filename %s'
+endfunction
+
+let s:col_end_patterns = [
+\   '\vParsing error: Unexpected token (.+) ',
+\   '\v''(.+)'' is not defined.',
+\   '\v%(Unexpected|Redundant use of) [''`](.+)[''`]',
+\   '\vUnexpected (console) statement',
+\]
+
+function! s:AddHintsForTypeScriptParsingErrors(output) abort
+    for l:item in a:output
+        let l:item.text = substitute(
+        \   l:item.text,
+        \   '^\(Parsing error\)',
+        \   '\1 (You may need configure typescript-eslint-parser)',
+        \   '',
+        \)
+    endfor
+endfunction
+
+function! ale#handlers#eslint#Handle(buffer, lines) abort
+    let l:config_error_pattern = '\v^ESLint couldn''t find a configuration file'
+    \   . '|^Cannot read config file'
+    \   . '|^.*Configuration for rule .* is invalid'
+    \   . '|^ImportDeclaration should appear'
+
+    " Look for a message in the first few lines which indicates that
+    " a configuration file couldn't be found.
+    for l:line in a:lines[:10]
+        if len(matchlist(l:line, l:config_error_pattern)) > 0
+            return [{
+            \   'lnum': 1,
+            \   'text': 'eslint configuration error (type :ALEDetail for more information)',
+            \   'detail': join(a:lines, "\n"),
+            \}]
+        endif
+    endfor
+
+    " Matches patterns line the following:
+    "
+    " /path/to/some-filename.js:47:14: Missing trailing comma. [Warning/comma-dangle]
+    " /path/to/some-filename.js:56:41: Missing semicolon. [Error/semi]
+    let l:pattern = '^.*:\(\d\+\):\(\d\+\): \(.\+\) \[\(.\+\)\]$'
+    " This second pattern matches lines like the following:
+    "
+    " /path/to/some-filename.js:13:3: Parsing error: Unexpected token
+    let l:parsing_pattern = '^.*:\(\d\+\):\(\d\+\): \(.\+\)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, [l:pattern, l:parsing_pattern])
+        let l:type = 'Error'
+        let l:text = l:match[3]
+
+        " Take the error type from the output if available.
+        if !empty(l:match[4])
+            let l:type = split(l:match[4], '/')[0]
+            let l:text .= ' [' . l:match[4] . ']'
+        endif
+
+        let l:obj = {
+        \   'lnum': l:match[1] + 0,
+        \   'col': l:match[2] + 0,
+        \   'text': l:text,
+        \   'type': l:type ==# 'Warning' ? 'W' : 'E',
+        \}
+
+        for l:col_match in ale#util#GetMatches(l:text, s:col_end_patterns)
+            let l:obj.end_col = l:obj.col + len(l:col_match[1]) - 1
+        endfor
+
+        call add(l:output, l:obj)
+    endfor
+
+    if expand('#' . a:buffer . ':t') =~? '\.tsx\?$'
+        call s:AddHintsForTypeScriptParsingErrors(l:output)
+    endif
+
+    return l:output
+endfunction

autoload/ale/handlers/haskell.vim

@@ -6,10 +6,11 @@ function! ale#handlers#haskell#HandleGHCFormat(buffer, lines) abort
     "
     "Appoint/Lib.hs:8:1: warning:
     "Appoint/Lib.hs:8:1:
-    let l:pattern = '^[^:]\+:\(\d\+\):\(\d\+\):\(.*\)\?$'
+    let l:pattern = '\v^([a-zA-Z]?:?[^:]+):(\d+):(\d+):(.*)?$'
     let l:output = []
 
     let l:corrected_lines = []
+
     for l:line in a:lines
         if len(matchlist(l:line, l:pattern)) > 0
             call add(l:corrected_lines, l:line)
@@ -30,21 +31,29 @@ function! ale#handlers#haskell#HandleGHCFormat(buffer, lines) abort
             continue
         endif
 
-        let l:errors = matchlist(l:match[3], '\(warning:\|error:\)\(.*\)')
-
-        if len(l:errors) > 0
-          let l:type = l:errors[1]
-          let l:text = l:errors[2]
-        else
-          let l:type = ''
-          let l:text = l:match[3]
+        if !ale#path#IsBufferPath(a:buffer, l:match[1])
+            continue
         endif
 
-        let l:type = l:type ==# '' ? 'E' : toupper(l:type[0])
+        let l:errors = matchlist(l:match[4], '\v([wW]arning|[eE]rror): ?(.*)')
+
+        if len(l:errors) > 0
+          let l:ghc_type = l:errors[1]
+          let l:text = l:errors[2]
+        else
+          let l:ghc_type = ''
+          let l:text = l:match[4][:0] ==# ' ' ? l:match[4][1:] : l:match[4]
+        endif
+
+        if l:ghc_type ==? 'Warning'
+            let l:type = 'W'
+        else
+            let l:type = 'E'
+        endif
 
         call add(l:output, {
-        \   'lnum': l:match[1] + 0,
-        \   'col': l:match[2] + 0,
+        \   'lnum': l:match[2] + 0,
+        \   'col': l:match[3] + 0,
         \   'text': l:text,
         \   'type': l:type,
         \})

autoload/ale/handlers/python.vim

@@ -1,37 +0,0 @@
-" Author: w0rp <devw0rp@gmail.com>
-" Description: Error handling for flake8, etc.
-
-function! ale#handlers#python#HandlePEP8Format(buffer, lines) abort
-    " Matches patterns line the following:
-    "
-    " Matches patterns line the following:
-    "
-    " stdin:6:6: E111 indentation is not a multiple of four
-    " test.yml:35: [EANSIBLE0002] Trailing whitespace
-    let l:pattern = '\v^[a-zA-Z]?:?[^:]+:(\d+):?(\d+)?: \[?([[:alnum:]]+)\]? (.*)$'
-    let l:output = []
-
-    for l:match in ale#util#GetMatches(a:lines, l:pattern)
-        let l:code = l:match[3]
-
-        if (l:code ==# 'W291' || l:code ==# 'W293' || l:code ==# 'EANSIBLE002')
-        \ && !ale#Var(a:buffer, 'warn_about_trailing_whitespace')
-            " Skip warnings for trailing whitespace if the option is off.
-            continue
-        endif
-
-        if l:code ==# 'I0011'
-            " Skip 'Locally disabling' message
-             continue
-        endif
-
-        call add(l:output, {
-        \   'lnum': l:match[1] + 0,
-        \   'col': l:match[2] + 0,
-        \   'text': l:code . ': ' . l:match[4],
-        \   'type': l:code[:0] ==# 'E' ? 'E' : 'W',
-        \})
-    endfor
-
-    return l:output
-endfunction

autoload/ale/handlers/rubocop.vim

@@ -0,0 +1,6 @@
+call ale#Set('ruby_rubocop_options', '')
+call ale#Set('ruby_rubocop_executable', 'rubocop')
+
+function! ale#handlers#rubocop#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'ruby_rubocop_executable')
+endfunction

autoload/ale/handlers/rust.vim

@@ -8,13 +8,13 @@ if !exists('g:ale_rust_ignore_error_codes')
 endif
 
 " returns: a list [lnum, col] with the location of the error or []
-function! s:FindErrorInExpansion(span, file_name) abort
-    if a:span.file_name ==# a:file_name
-        return [a:span.line_start, a:span.byte_start]
+function! s:FindErrorInExpansion(span, buffer) abort
+    if ale#path#IsBufferPath(a:buffer, a:span.file_name)
+        return [a:span.line_start, a:span.line_end, a:span.byte_start, a:span.byte_end]
     endif
 
     if !empty(a:span.expansion)
-        return s:FindErrorInExpansion(a:span.expansion.span, a:file_name)
+        return s:FindErrorInExpansion(a:span.expansion.span, a:buffer)
     endif
 
     return []
@@ -22,7 +22,6 @@ endfunction
 
 " A handler function which accepts a file name, to make unit testing easier.
 function! ale#handlers#rust#HandleRustErrorsForFile(buffer, full_filename, lines) abort
-    let l:filename = fnamemodify(a:full_filename, ':t')
     let l:output = []
 
     for l:errorline in a:lines
@@ -46,27 +45,29 @@ function! ale#handlers#rust#HandleRustErrorsForFile(buffer, full_filename, lines
         endif
 
         for l:span in l:error.spans
-            let l:span_filename = fnamemodify(l:span.file_name, ':t')
-
             if (
             \   l:span.is_primary
-            \   && (l:span_filename ==# l:filename || l:span_filename ==# '<anon>')
+            \   && (ale#path#IsBufferPath(a:buffer, l:span.file_name) || l:span.file_name ==# '<anon>')
             \)
                 call add(l:output, {
                 \   'lnum': l:span.line_start,
+                \   'end_lnum': l:span.line_end,
                 \   'col': l:span.byte_start,
-                \   'text': l:error.message,
+                \   'end_col': l:span.byte_end,
+                \   'text': empty(l:span.label) ? l:error.message : printf('%s: %s', l:error.message, l:span.label),
                 \   'type': toupper(l:error.level[0]),
                 \})
             else
                 " when the error is caused in the expansion of a macro, we have
                 " to bury deeper
-                let l:root_cause = s:FindErrorInExpansion(l:span, l:filename)
+                let l:root_cause = s:FindErrorInExpansion(l:span, a:buffer)
 
                 if !empty(l:root_cause)
                     call add(l:output, {
                     \   'lnum': l:root_cause[0],
-                    \   'col': l:root_cause[1],
+                    \   'end_lnum': l:root_cause[1],
+                    \   'col': l:root_cause[2],
+                    \   'end_col': l:root_cause[3],
                     \   'text': l:error.message,
                     \   'type': toupper(l:error.level[0]),
                     \})

autoload/ale/highlight.vim

@@ -6,16 +6,52 @@ if !hlexists('ALEError')
     highlight link ALEError SpellBad
 endif
 
+if !hlexists('ALEStyleError')
+    highlight link ALEStyleError ALEError
+endif
+
 if !hlexists('ALEWarning')
     highlight link ALEWarning SpellCap
 endif
 
+if !hlexists('ALEStyleWarning')
+    highlight link ALEStyleWarning ALEWarning
+endif
+
+if !hlexists('ALEInfo')
+    highlight link ALEInfo ALEWarning
+endif
+
 " This map holds highlights to be set when buffers are opened.
 " We can only set highlights for whatever the current buffer is, so we will
 " wait until the buffer is entered again to show the highlights, unless
 " the buffer is in focus when linting completes.
 let s:buffer_highlights = {}
 let s:buffer_restore_map = {}
+" The maximum number of items for the second argument of matchaddpos()
+let s:MAX_POS_VALUES = 8
+let s:MAX_COL_SIZE = 1073741824 " pow(2, 30)
+
+function! ale#highlight#CreatePositions(line, col, end_line, end_col) abort
+    if a:line >= a:end_line
+        " For single lines, just return the one position.
+        return [[[a:line, a:col, a:end_col - a:col + 1]]]
+    endif
+
+    " Get positions from the first line at the first column, up to a large
+    " integer for highlighting up to the end of the line, followed by
+    " the lines in-between, for highlighting entire lines, and
+    " a highlight for the last line, up to the end column.
+    let l:all_positions =
+    \   [[a:line, a:col, s:MAX_COL_SIZE]]
+    \   + range(a:line + 1, a:end_line - 1)
+    \   + [[a:end_line, 1, a:end_col]]
+
+    return map(
+    \   range(0, len(l:all_positions) - 1, s:MAX_POS_VALUES),
+    \   'l:all_positions[v:val : v:val + s:MAX_POS_VALUES - 1]',
+    \)
+endfunction
 
 function! ale#highlight#UnqueueHighlights(buffer) abort
     if has_key(s:buffer_highlights, a:buffer)
@@ -28,24 +64,16 @@ function! ale#highlight#UnqueueHighlights(buffer) abort
 endfunction
 
 function! s:GetALEMatches() abort
-    let l:list = []
-
-    for l:match in getmatches()
-        if l:match['group'] ==# 'ALEError' || l:match['group'] ==# 'ALEWarning'
-            call add(l:list, l:match)
-        endif
-    endfor
-
-    return l:list
+    return filter(getmatches(), 'v:val.group =~# ''^ALE''')
 endfunction
 
 function! s:GetCurrentMatchIDs(loclist) abort
     let l:current_id_map = {}
 
     for l:item in a:loclist
-        if has_key(l:item, 'match_id')
-            let l:current_id_map[l:item.match_id] = 1
-        endif
+        for l:id in get(l:item, 'match_id_list', [])
+            let l:current_id_map[l:id] = 1
+        endfor
     endfor
 
     return l:current_id_map
@@ -73,7 +101,7 @@ function! ale#highlight#UpdateHighlights() abort
     endif
 
     " Remove anything with a current match_id
-    call filter(l:loclist, '!has_key(v:val, ''match_id'')')
+    call filter(l:loclist, '!has_key(v:val, ''match_id_list'')')
 
     " Restore items from the map of hidden items,
     " if we don't have some new items to set already.
@@ -83,15 +111,34 @@ function! ale#highlight#UpdateHighlights() abort
 
     if g:ale_enabled
         for l:item in l:loclist
-            let l:col = l:item.col
-            let l:group = l:item.type ==# 'E' ? 'ALEError' : 'ALEWarning'
-            let l:line = l:item.lnum
-            let l:size = 1
+            if l:item.type ==# 'W'
+                if get(l:item, 'sub_type', '') ==# 'style'
+                    let l:group = 'ALEStyleWarning'
+                else
+                    let l:group = 'ALEWarning'
+                endif
+            elseif l:item.type ==# 'I'
+                let l:group = 'ALEInfo'
+            elseif get(l:item, 'sub_type', '') ==# 'style'
+                let l:group = 'ALEStyleError'
+            else
+                let l:group = 'ALEError'
+            endif
 
-            " Rememeber the match ID for the item.
-            " This ID will be used to preserve loclist items which are set
-            " many times.
-            let l:item.match_id = matchaddpos(l:group, [[l:line, l:col, l:size]])
+            let l:line = l:item.lnum
+            let l:col = l:item.col
+            let l:end_line = get(l:item, 'end_lnum', l:line)
+            let l:end_col = get(l:item, 'end_col', l:col)
+
+            " Set all of the positions, which are chunked into Lists which
+            " are as large as will be accepted by matchaddpos.
+            "
+            " We will remember the IDs we set, so we can preserve some
+            " highlights when linting buffers after linting files.
+            let l:item.match_id_list = map(
+            \   ale#highlight#CreatePositions(l:line, l:col, l:end_line, l:end_col),
+            \   'matchaddpos(l:group, v:val)'
+            \)
         endfor
     endif
 endfunction
@@ -104,8 +151,8 @@ function! ale#highlight#BufferHidden(buffer) abort
         " Remove match_ids, as they must be re-calculated when buffers are
         " shown again.
         for l:item in l:loclist
-            if has_key(l:item, 'match_id')
-                call remove(l:item, 'match_id')
+            if has_key(l:item, 'match_id_list')
+                call remove(l:item, 'match_id_list')
             endif
         endfor
 

autoload/ale/history.vim

@@ -26,6 +26,11 @@ function! ale#history#Add(buffer, status, job_id, command) abort
 endfunction
 
 function! s:FindHistoryItem(buffer, job_id) abort
+    " Stop immediately if there's nothing set up for the buffer.
+    if !has_key(g:ale_buffer_info, a:buffer)
+        return {}
+    endif
+
     " Search backwards to find a matching job ID. IDs might be recycled,
     " so finding the last one should be good enough.
     for l:obj in reverse(g:ale_buffer_info[a:buffer].history[:])

autoload/ale/job.vim

@@ -0,0 +1,311 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Deciption: APIs for working with Asynchronous jobs, with an API normalised
+" between Vim 8 and NeoVim.
+"
+" Important functions are described below. They are:
+"
+"   ale#job#Start(command, options) -> job_id
+"   ale#job#IsRunning(job_id) -> 1 if running, 0 otherwise.
+"   ale#job#Stop(job_id)
+
+if !has_key(s:, 'job_map')
+    let s:job_map = {}
+endif
+
+" A map from timer IDs to jobs, for tracking jobs that need to be killed
+" with SIGKILL if they don't terminate right away.
+if !has_key(s:, 'job_kill_timers')
+    let s:job_kill_timers = {}
+endif
+
+function! s:KillHandler(timer) abort
+    let l:job = remove(s:job_kill_timers, a:timer)
+    call job_stop(l:job, 'kill')
+endfunction
+
+" Note that jobs and IDs are the same thing on NeoVim.
+function! ale#job#JoinNeovimOutput(job, last_line, data, mode, callback) abort
+    let l:lines = a:data[:-2]
+
+    if len(a:data) > 1
+        let l:lines[0] = a:last_line . l:lines[0]
+        let l:new_last_line = a:data[-1]
+    else
+        let l:new_last_line = a:last_line . a:data[0]
+    endif
+
+    if a:mode ==# 'raw'
+        if !empty(l:lines)
+            call a:callback(a:job, join(l:lines, "\n") . "\n")
+        endif
+    else
+        for l:line in l:lines
+            call a:callback(a:job, l:line)
+        endfor
+    endif
+
+    return l:new_last_line
+endfunction
+
+function! s:NeoVimCallback(job, data, event) abort
+    let l:info = s:job_map[a:job]
+
+    if a:event ==# 'stdout'
+        let l:info.out_cb_line = ale#job#JoinNeovimOutput(
+        \   a:job,
+        \   l:info.out_cb_line,
+        \   a:data,
+        \   l:info.mode,
+        \   ale#util#GetFunction(l:info.out_cb),
+        \)
+    elseif a:event ==# 'stderr'
+        let l:info.err_cb_line = ale#job#JoinNeovimOutput(
+        \   a:job,
+        \   l:info.err_cb_line,
+        \   a:data,
+        \   l:info.mode,
+        \   ale#util#GetFunction(l:info.err_cb),
+        \)
+    else
+        if has_key(l:info, 'out_cb') && !empty(l:info.out_cb_line)
+            call ale#util#GetFunction(l:info.out_cb)(a:job, l:info.out_cb_line)
+        endif
+
+        if has_key(l:info, 'err_cb') && !empty(l:info.err_cb_line)
+            call ale#util#GetFunction(l:info.err_cb)(a:job, l:info.err_cb_line)
+        endif
+
+        try
+            call ale#util#GetFunction(l:info.exit_cb)(a:job, a:data)
+        finally
+            " Automatically forget about the job after it's done.
+            if has_key(s:job_map, a:job)
+                call remove(s:job_map, a:job)
+            endif
+        endtry
+    endif
+endfunction
+
+function! s:VimOutputCallback(channel, data) abort
+    let l:job = ch_getjob(a:channel)
+    let l:job_id = ale#job#ParseVim8ProcessID(string(l:job))
+
+    " Only call the callbacks for jobs which are valid.
+    if l:job_id > 0 && has_key(s:job_map, l:job_id)
+        call ale#util#GetFunction(s:job_map[l:job_id].out_cb)(l:job_id, a:data)
+    endif
+endfunction
+
+function! s:VimErrorCallback(channel, data) abort
+    let l:job = ch_getjob(a:channel)
+    let l:job_id = ale#job#ParseVim8ProcessID(string(l:job))
+
+    " Only call the callbacks for jobs which are valid.
+    if l:job_id > 0 && has_key(s:job_map, l:job_id)
+        call ale#util#GetFunction(s:job_map[l:job_id].err_cb)(l:job_id, a:data)
+    endif
+endfunction
+
+function! s:VimCloseCallback(channel) abort
+    let l:job = ch_getjob(a:channel)
+    let l:job_id = ale#job#ParseVim8ProcessID(string(l:job))
+    let l:info = get(s:job_map, l:job_id, {})
+
+    if empty(l:info)
+        return
+    endif
+
+    " job_status() can trigger the exit handler.
+    " The channel can close before the job has exited.
+    if job_status(l:job) ==# 'dead'
+        try
+            if !empty(l:info) && has_key(l:info, 'exit_cb')
+                call ale#util#GetFunction(l:info.exit_cb)(l:job_id, l:info.exit_code)
+            endif
+        finally
+            " Automatically forget about the job after it's done.
+            if has_key(s:job_map, l:job_id)
+                call remove(s:job_map, l:job_id)
+            endif
+        endtry
+    endif
+endfunction
+
+function! s:VimExitCallback(job, exit_code) abort
+    let l:job_id = ale#job#ParseVim8ProcessID(string(a:job))
+    let l:info = get(s:job_map, l:job_id, {})
+
+    if empty(l:info)
+        return
+    endif
+
+    let l:info.exit_code = a:exit_code
+
+    " The program can exit before the data has finished being read.
+    if ch_status(job_getchannel(a:job)) ==# 'closed'
+        try
+            if !empty(l:info) && has_key(l:info, 'exit_cb')
+                call ale#util#GetFunction(l:info.exit_cb)(l:job_id, a:exit_code)
+            endif
+        finally
+            " Automatically forget about the job after it's done.
+            if has_key(s:job_map, l:job_id)
+                call remove(s:job_map, l:job_id)
+            endif
+        endtry
+    endif
+endfunction
+
+function! ale#job#ParseVim8ProcessID(job_string) abort
+    return matchstr(a:job_string, '\d\+') + 0
+endfunction
+
+function! ale#job#ValidateArguments(command, options) abort
+    if a:options.mode !=# 'nl' && a:options.mode !=# 'raw'
+        throw 'Invalid mode: ' . a:options.mode
+    endif
+endfunction
+
+function! ale#job#PrepareCommand(command) abort
+    " The command will be executed in a subshell. This fixes a number of
+    " issues, including reading the PATH variables correctly, %PATHEXT%
+    " expansion on Windows, etc.
+    "
+    " NeoVim handles this issue automatically if the command is a String,
+    " but we'll do this explicitly, so we use thes same exact command for both
+    " versions.
+    if ale#Has('win32')
+        return 'cmd /c ' . a:command
+    endif
+
+    if &shell =~? 'fish$'
+        return ['/bin/sh', '-c', a:command]
+    endif
+
+    return split(&shell) + split(&shellcmdflag) + [a:command]
+endfunction
+
+" Start a job with options which are agnostic to Vim and NeoVim.
+"
+" The following options are accepted:
+"
+" out_cb  - A callback for receiving stdin.  Arguments: (job_id, data)
+" err_cb  - A callback for receiving stderr. Arguments: (job_id, data)
+" exit_cb - A callback for program exit.     Arguments: (job_id, status_code)
+" mode    - A mode for I/O. Can be 'nl' for split lines or 'raw'.
+function! ale#job#Start(command, options) abort
+    call ale#job#ValidateArguments(a:command, a:options)
+
+    let l:job_info = copy(a:options)
+    let l:job_options = {}
+
+    if has('nvim')
+        if has_key(a:options, 'out_cb')
+            let l:job_options.on_stdout = function('s:NeoVimCallback')
+            let l:job_info.out_cb_line = ''
+        endif
+
+        if has_key(a:options, 'err_cb')
+            let l:job_options.on_stderr = function('s:NeoVimCallback')
+            let l:job_info.err_cb_line = ''
+        endif
+
+        if has_key(a:options, 'exit_cb')
+            let l:job_options.on_exit = function('s:NeoVimCallback')
+        endif
+
+        let l:job_info.job = jobstart(a:command, l:job_options)
+        let l:job_id = l:job_info.job
+    else
+        let l:job_options = {
+        \   'in_mode': l:job_info.mode,
+        \   'out_mode': l:job_info.mode,
+        \   'err_mode': l:job_info.mode,
+        \}
+
+        if has_key(a:options, 'out_cb')
+            let l:job_options.out_cb = function('s:VimOutputCallback')
+        endif
+
+        if has_key(a:options, 'err_cb')
+            let l:job_options.err_cb = function('s:VimErrorCallback')
+        endif
+
+        if has_key(a:options, 'exit_cb')
+            " Set a close callback to which simply calls job_status()
+            " when the channel is closed, which can trigger the exit callback
+            " earlier on.
+            let l:job_options.close_cb = function('s:VimCloseCallback')
+            let l:job_options.exit_cb = function('s:VimExitCallback')
+        endif
+
+        " Vim 8 will read the stdin from the file's buffer.
+        let l:job_info.job = job_start(a:command, l:job_options)
+        let l:job_id = ale#job#ParseVim8ProcessID(string(l:job_info.job))
+    endif
+
+    if l:job_id
+        " Store the job in the map for later only if we can get the ID.
+        let s:job_map[l:job_id] = l:job_info
+    endif
+
+    return l:job_id
+endfunction
+
+" Send raw data to the job.
+function! ale#job#SendRaw(job_id, string) abort
+    if has('nvim')
+        call jobsend(a:job_id, a:string)
+    else
+        call ch_sendraw(job_getchannel(s:job_map[a:job_id].job), a:string)
+    endif
+endfunction
+
+" Given a job ID, return 1 if the job is currently running.
+" Invalid job IDs will be ignored.
+function! ale#job#IsRunning(job_id) abort
+    if has('nvim')
+        try
+            " In NeoVim, if the job isn't running, jobpid() will throw.
+            call jobpid(a:job_id)
+            return 1
+        catch
+        endtry
+    elseif has_key(s:job_map, a:job_id)
+        let l:job = s:job_map[a:job_id].job
+        return job_status(l:job) ==# 'run'
+    endif
+
+    return 0
+endfunction
+
+" Given a Job ID, stop that job.
+" Invalid job IDs will be ignored.
+function! ale#job#Stop(job_id) abort
+    if !has_key(s:job_map, a:job_id)
+        return
+    endif
+
+    if has('nvim')
+        " FIXME: NeoVim kills jobs on a timer, but will not kill any processes
+        " which are child processes on Unix. Some work needs to be done to
+        " kill child processes to stop long-running processes like pylint.
+        call jobstop(a:job_id)
+    else
+        let l:job = s:job_map[a:job_id].job
+
+        " We must close the channel for reading the buffer if it is open
+        " when stopping a job. Otherwise, we will get errors in the status line.
+        if ch_status(job_getchannel(l:job)) ==# 'open'
+            call ch_close_in(job_getchannel(l:job))
+        endif
+
+        " Ask nicely for the job to stop.
+        call job_stop(l:job)
+
+        if ale#job#IsRunning(l:job)
+            " Set a 100ms delay for killing the job with SIGKILL.
+            let s:job_kill_timers[timer_start(100, function('s:KillHandler'))] = l:job
+        endif
+    endif
+endfunction

autoload/ale/linter.vim

@@ -4,7 +4,7 @@
 
 let s:linters = {}
 
-" Default filetype aliaes.
+" Default filetype aliases.
 " The user defined aliases will be merged with this Dictionary.
 let s:default_ale_linter_aliases = {
 \   'Dockerfile': 'dockerfile',
@@ -23,7 +23,7 @@ let s:default_ale_linter_aliases = {
 " rpmlint is disabled by default because it can result in code execution.
 let s:default_ale_linters = {
 \   'csh': ['shell'],
-\   'go': ['go build', 'gofmt', 'golint', 'gosimple', 'go vet', 'staticcheck'],
+\   'go': ['gofmt', 'golint', 'go vet'],
 \   'help': [],
 \   'rust': ['cargo'],
 \   'spec': [],
@@ -50,7 +50,9 @@ function! ale#linter#PreProcess(linter) abort
     endif
 
     let l:obj = {
+    \   'add_newline': get(a:linter, 'add_newline', 0),
     \   'name': get(a:linter, 'name'),
+    \   'lsp': get(a:linter, 'lsp', ''),
     \   'callback': get(a:linter, 'callback'),
     \}
 
@@ -62,7 +64,27 @@ function! ale#linter#PreProcess(linter) abort
         throw '`callback` must be defined with a callback to accept output'
     endif
 
-    if has_key(a:linter, 'executable_callback')
+    let l:needs_executable = 0
+    let l:needs_address = 0
+    let l:needs_command = 0
+
+    if l:obj.lsp ==# 'tsserver'
+        let l:needs_executable = 1
+    elseif l:obj.lsp ==# 'lsp'
+        let l:needs_address = 1
+    elseif !empty(l:obj.lsp)
+        throw '`lsp` must be either `''lsp''` or `''tsserver''` if defined'
+    else
+        let l:needs_executable = 1
+        let l:needs_command = 1
+    endif
+
+    if !l:needs_executable
+        if has_key(a:linter, 'executable')
+        \|| has_key(a:linter, 'executable_callback')
+            throw '`executable` and `executable_callback` cannot be used when lsp == ''lsp'''
+        endif
+    elseif has_key(a:linter, 'executable_callback')
         let l:obj.executable_callback = a:linter.executable_callback
 
         if !s:IsCallback(l:obj.executable_callback)
@@ -78,7 +100,13 @@ function! ale#linter#PreProcess(linter) abort
         throw 'Either `executable` or `executable_callback` must be defined'
     endif
 
-    if has_key(a:linter, 'command_chain')
+    if !l:needs_command
+        if has_key(a:linter, 'command')
+        \|| has_key(a:linter, 'command_callback')
+        \|| has_key(a:linter, 'command_chain')
+            throw '`command` and `command_callback` and `command_chain` cannot be used when `lsp` is set'
+        endif
+    elseif has_key(a:linter, 'command_chain')
         let l:obj.command_chain = a:linter.command_chain
 
         if type(l:obj.command_chain) != type([])
@@ -138,6 +166,20 @@ function! ale#linter#PreProcess(linter) abort
         \   . 'should be set'
     endif
 
+    if !l:needs_address
+        if has_key(a:linter, 'address_callback')
+            throw '`address_callback` cannot be used when lsp != ''lsp'''
+        endif
+    elseif has_key(a:linter, 'address_callback')
+        let l:obj.address_callback = a:linter.address_callback
+
+        if !s:IsCallback(l:obj.address_callback)
+            throw '`address_callback` must be a callback if defined'
+        endif
+    else
+        throw '`address_callback` must be defined for getting the LSP address'
+    endif
+
     let l:obj.output_stream = get(a:linter, 'output_stream', 'stdout')
 
     if type(l:obj.output_stream) != type('')
@@ -164,6 +206,13 @@ function! ale#linter#PreProcess(linter) abort
         throw 'Only one of `lint_file` or `read_buffer` can be `1`'
     endif
 
+    let l:obj.aliases = get(a:linter, 'aliases', [])
+
+    if type(l:obj.aliases) != type([])
+    \|| len(filter(copy(l:obj.aliases), 'type(v:val) != type('''')')) > 0
+        throw '`aliases` must be a List of String values'
+    endif
+
     return l:obj
 endfunction
 
@@ -242,7 +291,7 @@ function! s:GetLinterNames(original_filetype) abort
 endfunction
 
 function! ale#linter#Get(original_filetypes) abort
-    let l:combined_linters = []
+    let l:possibly_duplicated_linters = []
 
     " Handle dot-seperated filetypes.
     for l:original_filetype in split(a:original_filetypes, '\.')
@@ -256,14 +305,33 @@ function! ale#linter#Get(original_filetypes) abort
         elseif type(l:linter_names) == type([])
             " Select only the linters we or the user has specified.
             for l:linter in l:all_linters
-                if index(l:linter_names, l:linter.name) >= 0
-                    call add(l:filetype_linters, l:linter)
-                endif
+                let l:name_list = [l:linter.name] + l:linter.aliases
+
+                for l:name in l:name_list
+                    if index(l:linter_names, l:name) >= 0
+                        call add(l:filetype_linters, l:linter)
+                        break
+                    endif
+                endfor
             endfor
         endif
 
-        call extend(l:combined_linters, l:filetype_linters)
+        call extend(l:possibly_duplicated_linters, l:filetype_linters)
     endfor
 
-    return l:combined_linters
+    let l:name_list = []
+    let l:combined_linters = []
+
+    " Make sure we override linters so we don't get two with the same name,
+    " like 'eslint' for both 'javascript' and 'typescript'
+    "
+    " Note that the reverse calls here modify the List variables.
+    for l:linter in reverse(l:possibly_duplicated_linters)
+        if index(l:name_list, l:linter.name) < 0
+            call add(l:name_list, l:linter.name)
+            call add(l:combined_linters, l:linter)
+        endif
+    endfor
+
+    return reverse(l:combined_linters)
 endfunction

autoload/ale/list.vim

@@ -12,49 +12,60 @@ function! ale#list#IsQuickfixOpen() abort
 endfunction
 
 function! ale#list#SetLists(buffer, loclist) abort
+    let l:title = expand('#' . a:buffer . ':p')
+
     if g:ale_set_quickfix
-        call setqflist(a:loclist)
+        if has('nvim')
+            call setqflist(a:loclist, ' ', l:title)
+        else
+            call setqflist(a:loclist)
+            call setqflist([], 'r', {'title': l:title})
+        endif
     elseif g:ale_set_loclist
         " If windows support is off, bufwinid() may not exist.
-        if exists('*bufwinid')
-            " Set the results on the window for the buffer.
-            call setloclist(bufwinid(str2nr(a:buffer)), a:loclist)
+        " We'll set result in the current window, which might not be correct,
+        " but is better than nothing.
+        let l:win_id = exists('*bufwinid') ? bufwinid(str2nr(a:buffer)) : 0
+
+        if has('nvim')
+            call setloclist(l:win_id, a:loclist, ' ', l:title)
         else
-            " Set the results in the current window.
-            " This may not be the same window we ran the linters for, but
-            " it's better than nothing.
-            call setloclist(0, a:loclist)
+            call setloclist(l:win_id, a:loclist)
+            call setloclist(l:win_id, [], 'r', {'title': l:title})
         endif
     endif
 
-    " If we don't auto-open lists, bail out here.
-    if !g:ale_open_list && !g:ale_keep_list_window_open
-        return
-    endif
-
     " If we have errors in our list, open the list. Only if it isn't already open
-    if len(a:loclist) > 0 || g:ale_keep_list_window_open
+    if (g:ale_open_list && !empty(a:loclist)) || g:ale_keep_list_window_open
         let l:winnr = winnr()
 
-        if !ale#list#IsQuickfixOpen()
-          if g:ale_set_quickfix
-              copen
-          elseif g:ale_set_loclist
-              lopen
-          endif
+        if g:ale_set_quickfix
+            if !ale#list#IsQuickfixOpen()
+                execute 'copen ' . str2nr(ale#Var(a:buffer, 'list_window_size'))
+            endif
+        elseif g:ale_set_loclist
+            execute 'lopen ' . str2nr(ale#Var(a:buffer, 'list_window_size'))
         endif
 
         " If focus changed, restore it (jump to the last window).
         if l:winnr !=# winnr()
             wincmd p
         endif
+    endif
+endfunction
 
-        " Only close if the list is totally empty (relying on Vim's state, not our
-        " own). This keeps us from closing the window when other plugins have
-        " populated it.
-    elseif !g:ale_keep_list_window_open && g:ale_set_quickfix && len(getqflist()) == 0
-        cclose
-    elseif !g:ale_keep_list_window_open && len(getloclist(0)) == 0
+function! ale#list#CloseWindowIfNeeded(buffer) abort
+    if g:ale_keep_list_window_open || !g:ale_open_list
+        return
+    endif
+
+    " Only close windows if the quickfix list or loclist is completely empty,
+    " including errors set through other means.
+    if g:ale_set_quickfix
+        if empty(getqflist())
+            cclose
+        endif
+    elseif g:ale_set_loclist && empty(getloclist(0))
         lclose
     endif
 endfunction

autoload/ale/loclist_jumping.vim

@@ -64,3 +64,16 @@ function! ale#loclist_jumping#Jump(direction, wrap) abort
         call cursor(l:nearest)
     endif
 endfunction
+
+function! ale#loclist_jumping#JumpToIndex(index) abort
+    let l:info = get(g:ale_buffer_info, bufnr('%'), {'loclist': []})
+    let l:loclist = l:info.loclist
+    if empty(l:loclist)
+        return
+    endif
+
+    let l:item = l:loclist[a:index]
+    if !empty(l:item)
+        call cursor([l:item.lnum, l:item.col])
+    endif
+endfunction

autoload/ale/lsp.vim

@@ -0,0 +1,285 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Language Server Protocol client code
+
+" A List of connections, used for tracking servers which have been connected
+" to, and programs which are run.
+let s:connections = []
+let g:ale_lsp_next_message_id = 1
+
+function! s:NewConnection() abort
+    " data: The message data received so far.
+    " address: An address only set for server connections.
+    " executable: An executable only set for program connections.
+    " job: A job ID only set for running programs.
+    let l:conn = {
+    \   'data': '',
+    \   'address': '',
+    \   'executable': '',
+    \   'job_id': -1,
+    \}
+
+    call add(s:connections, l:conn)
+
+    return l:conn
+endfunction
+
+
+function! ale#lsp#GetNextMessageID() abort
+    " Use the current ID
+    let l:id = g:ale_lsp_next_message_id
+
+    " Increment the ID variable.
+    let g:ale_lsp_next_message_id += 1
+
+    " When the ID overflows, reset it to 1. By the time we hit the initial ID
+    " again, the messages will be long gone.
+    if g:ale_lsp_next_message_id < 1
+        let g:ale_lsp_next_message_id = 1
+    endif
+
+    return l:id
+endfunction
+
+" TypeScript messages use a different format.
+function! s:CreateTSServerMessageData(message) abort
+    let l:is_notification = a:message[0]
+
+    let l:obj = {
+    \   'seq': v:null,
+    \   'type': 'request',
+    \   'command': a:message[1][3:],
+    \}
+
+    if !l:is_notification
+        let l:obj.seq = ale#lsp#GetNextMessageID()
+    endif
+
+    if len(a:message) > 2
+        let l:obj.arguments = a:message[2]
+    endif
+
+    let l:data = json_encode(l:obj) . "\n"
+    return [l:is_notification ? 0 : l:obj.seq, l:data]
+endfunction
+
+" Given a List of one or two items, [method_name] or [method_name, params],
+" return a List containing [message_id, message_data]
+function! ale#lsp#CreateMessageData(message) abort
+    if a:message[1] =~# '^ts@'
+        return s:CreateTSServerMessageData(a:message)
+    endif
+
+    let l:is_notification = a:message[0]
+
+    let l:obj = {
+    \   'id': v:null,
+    \   'jsonrpc': '2.0',
+    \   'method': a:message[1],
+    \}
+
+    if !l:is_notification
+        let l:obj.id = ale#lsp#GetNextMessageID()
+    endif
+
+    if len(a:message) > 2
+        let l:obj.params = a:message[2]
+    endif
+
+    let l:body = json_encode(l:obj)
+    let l:data = 'Content-Length: ' . strlen(l:body) . "\r\n\r\n" . l:body
+
+    return [l:is_notification ? 0 : l:obj.id, l:data]
+endfunction
+
+function! ale#lsp#ReadMessageData(data) abort
+    let l:response_list = []
+    let l:remainder = a:data
+
+    while 1
+        " Look for the end of the HTTP headers
+        let l:body_start_index = matchend(l:remainder, "\r\n\r\n")
+
+        if l:body_start_index < 0
+            " No header end was found yet.
+            break
+        endif
+
+        " Parse the Content-Length header.
+        let l:header_data = l:remainder[:l:body_start_index - 4]
+        let l:length_match = matchlist(
+        \   l:header_data,
+        \   '\vContent-Length: *(\d+)'
+        \)
+
+        if empty(l:length_match)
+            throw "Invalid JSON-RPC header:\n" . l:header_data
+        endif
+
+        " Split the body and the remainder of the text.
+        let l:remainder_start_index = l:body_start_index + str2nr(l:length_match[1])
+
+        if len(l:remainder) < l:remainder_start_index
+            " We don't have enough data yet.
+            break
+        endif
+
+        let l:body = l:remainder[l:body_start_index : l:remainder_start_index - 1]
+        let l:remainder = l:remainder[l:remainder_start_index :]
+
+        " Parse the JSON object and add it to the list.
+        call add(l:response_list, json_decode(l:body))
+    endwhile
+
+    return [l:remainder, l:response_list]
+endfunction
+
+function! ale#lsp#HandleMessage(conn, message) abort
+    let a:conn.data .= a:message
+
+    " Parse the objects now if we can, and keep the remaining text.
+    let [a:conn.data, l:response_list] = ale#lsp#ReadMessageData(a:conn.data)
+
+    " Call our callbacks.
+    for l:response in l:response_list
+        if has_key(a:conn, 'callback')
+            call ale#util#GetFunction(a:conn.callback)(l:response)
+        endif
+    endfor
+endfunction
+
+function! s:HandleChannelMessage(channel, message) abort
+    let l:info = ch_info(a:channel)
+    let l:address = l:info.hostname . l:info.address
+    let l:conn = filter(s:connections[:], 'v:val.address ==# l:address')[0]
+
+    call ale#lsp#HandleMessage(l:conn, a:message)
+endfunction
+
+function! s:HandleCommandMessage(job_id, message) abort
+    let l:conn = filter(s:connections[:], 'v:val.job_id == a:job_id')[0]
+
+    call ale#lsp#HandleMessage(l:conn, a:message)
+endfunction
+
+" Start a program for LSP servers which run with executables.
+"
+" The job ID will be returned for for the program if it ran, otherwise
+" 0 will be returned.
+function! ale#lsp#StartProgram(executable, command, callback) abort
+    if !executable(a:executable)
+        return 0
+    endif
+
+    let l:matches = filter(s:connections[:], 'v:val.executable ==# a:executable')
+
+    " Get the current connection or a new one.
+    let l:conn = !empty(l:matches) ? l:matches[0] : s:NewConnection()
+    let l:conn.executable = a:executable
+    let l:conn.callback = a:callback
+
+    if !ale#job#IsRunning(l:conn.job_id)
+        let l:options = {
+        \   'mode': 'raw',
+        \   'out_cb': function('s:HandleCommandMessage'),
+        \}
+        let l:job_id = ale#job#Start(a:command, l:options)
+    else
+        let l:job_id = l:conn.job_id
+    endif
+
+    if l:job_id <= 0
+        return 0
+    endif
+
+    let l:conn.job_id = l:job_id
+
+    return l:job_id
+endfunction
+
+" Send a message to a server with a given executable, and a command for
+" running the executable.
+"
+" Returns -1 when a message is sent, but no response is expected
+"          0 when the message is not sent and
+"          >= 1 with the message ID when a response is expected.
+function! ale#lsp#SendMessageToProgram(executable, message) abort
+    let [l:id, l:data] = ale#lsp#CreateMessageData(a:message)
+
+    let l:matches = filter(s:connections[:], 'v:val.executable ==# a:executable')
+
+    " No connection is currently open.
+    if empty(l:matches)
+        return 0
+    endif
+
+    " Get the current connection or a new one.
+    let l:conn = l:matches[0]
+    let l:conn.executable = a:executable
+
+    if get(l:conn, 'job_id', 0) == 0
+        return 0
+    endif
+
+    call ale#job#SendRaw(l:conn.job_id, l:data)
+
+    return l:id == 0 ? -1 : l:id
+endfunction
+
+" Connect to an address and set up a callback for handling responses.
+function! ale#lsp#ConnectToAddress(address, callback) abort
+    let l:matches = filter(s:connections[:], 'v:val.address ==# a:address')
+    " Get the current connection or a new one.
+    let l:conn = !empty(l:matches) ? l:matches[0] : s:NewConnection()
+
+    if !has_key(l:conn, 'channel') || ch_status(l:conn.channel) !=# 'open'
+        let l:conn.channnel = ch_open(a:address, {
+        \   'mode': 'raw',
+        \   'waittime': 0,
+        \   'callback': function('s:HandleChannelMessage'),
+        \})
+    endif
+
+    if ch_status(l:conn.channnel) ==# 'fail'
+        return 0
+    endif
+
+    let l:conn.callback = a:callback
+
+    return 1
+endfunction
+
+" Send a message to a server at a given address.
+" Notifications do not need to be handled.
+"
+" Returns -1 when a message is sent, but no response is expected
+"          0 when the message is not sent and
+"          >= 1 with the message ID when a response is expected.
+function! ale#lsp#SendMessageToAddress(address, message) abort
+    if a:0 > 1
+        throw 'Too many arguments!'
+    endif
+
+    if !a:message[0] && a:0 == 0
+        throw 'A callback must be set for messages which are not notifications!'
+    endif
+
+    let [l:id, l:data] = ale#lsp#CreateMessageData(a:message)
+
+    let l:matches = filter(s:connections[:], 'v:val.address ==# a:address')
+
+    " No connection is currently open.
+    if empty(l:matches)
+        return 0
+    endif
+
+    let l:conn = l:matches[0]
+
+    if ch_status(l:conn.channnel) !=# 'open'
+        return 0
+    endif
+
+    " Send the message to the server
+    call ch_sendraw(l:conn.channel, l:data)
+
+    return l:id == 0 ? -1 : l:id
+endfunction

autoload/ale/lsp/message.vim

@@ -0,0 +1,64 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Language Server Protocol message implementations
+"
+" Messages in this movie will be returned in the format
+" [is_notification, method_name, params?]
+
+function! ale#lsp#message#Initialize(root_uri) abort
+    " TODO: Define needed capabilities.
+    return [0, 'initialize', {
+    \   'processId': getpid(),
+    \   'rootUri': a:root_uri,
+    \   'capabilities': {},
+    \}]
+endfunction
+
+function! ale#lsp#message#Initialized() abort
+    return [1, 'initialized']
+endfunction
+
+function! ale#lsp#message#Shutdown() abort
+    return [0, 'shutdown']
+endfunction
+
+function! ale#lsp#message#Exit() abort
+    return [1, 'exit']
+endfunction
+
+function! ale#lsp#message#DidOpen(uri, language_id, version, text) abort
+    return [1, 'textDocument/didOpen', {
+    \   'textDocument': {
+    \       'uri': a:uri,
+    \       'languageId': a:language_id,
+    \       'version': a:version,
+    \       'text': a:text,
+    \   },
+    \}]
+endfunction
+
+function! ale#lsp#message#DidChange(uri, version, text) abort
+    " For changes, we simply send the full text of the document to the server.
+    return [1, 'textDocument/didChange', {
+    \   'textDocument': {
+    \       'uri': a:uri,
+    \       'version': a:version,
+    \   },
+    \   'contentChanges': [{'text': a:text}]
+    \}]
+endfunction
+
+function! ale#lsp#message#DidSave(uri) abort
+    return [1, 'textDocument/didSave', {
+    \   'textDocument': {
+    \       'uri': a:uri,
+    \   },
+    \}]
+endfunction
+
+function! ale#lsp#message#DidClose(uri) abort
+    return [1, 'textDocument/didClose', {
+    \   'textDocument': {
+    \       'uri': a:uri,
+    \   },
+    \}]
+endfunction

autoload/ale/lsp/response.vim

@@ -0,0 +1,67 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Parsing and transforming of LSP server responses.
+
+" Constants for message severity codes.
+let s:SEVERITY_ERROR = 1
+let s:SEVERITY_WARNING = 2
+let s:SEVERITY_INFORMATION = 3
+let s:SEVERITY_HINT = 4
+
+" Parse the message for textDocument/publishDiagnostics
+function! ale#lsp#response#ReadDiagnostics(params) abort
+    let l:filename = a:params.uri
+    let l:loclist = []
+
+    for l:diagnostic in a:params.diagnostics
+        let l:severity = get(l:diagnostic, 'severity', 0)
+        let l:loclist_item = {
+        \   'text': l:diagnostic.message,
+        \   'type': 'E',
+        \   'lnum': l:diagnostic.range.start.line + 1,
+        \   'col': l:diagnostic.range.start.character + 1,
+        \   'end_lnum': l:diagnostic.range.end.line + 1,
+        \   'end_col': l:diagnostic.range.end.character + 1,
+        \}
+
+        if l:severity == s:SEVERITY_WARNING
+            let l:loclist_item.type = 'W'
+        elseif l:severity == s:SEVERITY_INFORMATION
+            " TODO: Use 'I' here in future.
+            let l:loclist_item.type = 'W'
+        elseif l:severity == s:SEVERITY_HINT
+            " TODO: Use 'H' here in future
+            let l:loclist_item.type = 'W'
+        endif
+
+        if has_key(l:diagnostic, 'code')
+            let l:loclist_item.nr = l:diagnostic.code
+        endif
+
+        call add(l:loclist, l:loclist_item)
+    endfor
+
+    return [l:filename, l:loclist]
+endfunction
+
+function! ale#lsp#response#ReadTSServerDiagnostics(response) abort
+    let l:loclist = []
+
+    for l:diagnostic in a:response.body.diagnostics
+        let l:loclist_item = {
+        \   'text': l:diagnostic.text,
+        \   'type': 'E',
+        \   'lnum': l:diagnostic.start.line,
+        \   'col': l:diagnostic.start.offset,
+        \   'end_lnum': l:diagnostic.end.line,
+        \   'end_col': l:diagnostic.end.offset,
+        \}
+
+        if has_key(l:diagnostic, 'code')
+            let l:loclist_item.nr = l:diagnostic.code
+        endif
+
+        call add(l:loclist, l:loclist_item)
+    endfor
+
+    return l:loclist
+endfunction

autoload/ale/lsp/tsserver_message.vim

@@ -0,0 +1,37 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: tsserver message implementations
+"
+" Messages in this movie will be returned in the format
+" [is_notification, command_name, params?]
+"
+" Every command must begin with the string 'ts@', which will be used to
+" detect the different message format for tsserver, and this string will
+" be removed from the actual command name,
+
+function! ale#lsp#tsserver_message#Open(buffer) abort
+    return [1, 'ts@open', {'file': expand('#' . a:buffer . ':p')}]
+endfunction
+
+function! ale#lsp#tsserver_message#Close(buffer) abort
+    return [1, 'ts@close', {'file': expand('#' . a:buffer . ':p')}]
+endfunction
+
+function! ale#lsp#tsserver_message#Change(buffer) abort
+    let l:lines = getbufline(a:buffer, 1, '$')
+
+    " We will always use a very high endLine number, so we can delete
+    " lines from files. tsserver will gladly accept line numbers beyond the
+    " end.
+    return [1, 'ts@change', {
+    \   'file': expand('#' . a:buffer . ':p'),
+    \   'line': 1,
+    \   'offset': 1,
+    \   'endLine': 1073741824 ,
+    \   'endOffset': 1,
+    \   'insertString': join(l:lines, "\n"),
+    \}]
+endfunction
+
+function! ale#lsp#tsserver_message#Geterr(buffer) abort
+    return [1, 'ts@geterr', {'files': [expand('#' . a:buffer . ':p')]}]
+endfunction

autoload/ale/node.vim

@@ -0,0 +1,22 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Functions for working with Node executables.
+
+" Given a buffer number, a base variable name, and a list of paths to search
+" for in ancestor directories, detect the executable path for a Node program.
+"
+" The use_global and executable options for the relevant program will be used.
+function! ale#node#FindExecutable(buffer, base_var_name, path_list) abort
+    if ale#Var(a:buffer, a:base_var_name . '_use_global')
+        return ale#Var(a:buffer, a:base_var_name . '_executable')
+    endif
+
+    for l:path in a:path_list
+        let l:executable = ale#path#FindNearestFile(a:buffer, l:path)
+
+        if !empty(l:executable)
+            return l:executable
+        endif
+    endfor
+
+    return ale#Var(a:buffer, a:base_var_name . '_executable')
+endfunction