# Asynchronous Lint Engine [![Travis CI Build Status](https://travis-ci.org/w0rp/ale.svg?branch=master)](https://travis-ci.org/w0rp/ale) [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/github/w0rp/ale?svg=true)](https://ci.appveyor.com/project/w0rp/ale) ![ALE Logo by Mark Grealish - https://www.bhalash.com/](img/logo.jpg?raw=true) ALE (Asynchronous Lint Engine) is a plugin for providing linting in NeoVim and Vim 8 while you edit your text files. ![linting example](img/example.gif?raw=true) ALE makes use of NeoVim and Vim 8 job control functions and timers to run linters on the contents of text buffers and return errors as text is changed in Vim. This allows for displaying warnings and errors in files being edited in Vim before files have been saved back to a filesystem. In other words, this plugin allows you to lint while you type. In addition to linting support, ALE offers some support for fixing code with formatting tools, and completion via Language Server Protocol servers, or servers with similar enough protocols, like `tsserver`. ## Table of Contents 1. [Supported Languages and Tools](#supported-languages) 2. [Usage](#usage) 1. [Linting](#usage-linting) 2. [Fixing](#usage-fixing) 3. [Completion](#usage-completion) 3. [Installation](#installation) 1. [Installation with Vim package management](#standard-installation) 2. [Installation with Pathogen](#installation-with-pathogen) 3. [Installation with Vundle](#installation-with-vundle) 4. [Contributing](#contributing) 5. [FAQ](#faq) 1. [How do I disable particular linters?](#faq-disable-linters) 2. [How can I keep the sign gutter open?](#faq-keep-signs) 3. [How can I change the signs ALE uses?](#faq-change-signs) 4. [How can I show errors or warnings in my statusline?](#faq-statusline) 5. [How can I show errors or warnings in my lightline?](#faq-lightline) 6. [How can I change the format for echo messages?](#faq-echo-format) 7. [How can I execute some code when ALE stops linting?](#faq-autocmd) 8. [How can I navigate between errors quickly?](#faq-navigation) 9. [How can I run linters only when I save files?](#faq-lint-on-save) 10. [How can I use the quickfix list instead of the loclist?](#faq-quickfix) 11. [How can I check JSX files with both stylelint and eslint?](#faq-jsx-stylelint-eslint) 12. [Will this plugin eat all of my laptop battery power?](#faq-my-battery-is-sad) ## 1. Supported Languages and Tools This plugin supports the following languages and tools. All available tools will be run in combination, so they can be complementary. **Notes:** * *^ No linters for text or Vim help filetypes are enabled by default.* * *!! These linters check only files on disk. See `:help ale-lint-file-linters`* | Language | Tools | | -------- | ----- | | ASM | [gcc](https://gcc.gnu.org) | | Ansible | [ansible-lint](https://github.com/willthames/ansible-lint) | | AsciiDoc | [proselint](http://proselint.com/), [write-good](https://github.com/btford/write-good)| | Awk | [gawk](https://www.gnu.org/software/gawk/)| | Bash | shell [-n flag](https://www.gnu.org/software/bash/manual/bash.html#index-set), [shellcheck](https://www.shellcheck.net/) | | Bourne Shell | shell [-n flag](http://linux.die.net/man/1/sh), [shellcheck](https://www.shellcheck.net/) | | C | [cppcheck](http://cppcheck.sourceforge.net), [cpplint](https://github.com/google/styleguide/tree/gh-pages/cpplint), [gcc](https://gcc.gnu.org/), [clang](http://clang.llvm.org/), [clangtidy](http://clang.llvm.org/extra/clang-tidy/) !!, [clang-format](https://clang.llvm.org/docs/ClangFormat.html)| | 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/), [clang-format](https://clang.llvm.org/docs/ClangFormat.html)| | CUDA | [nvcc](http://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/index.html) | | C# | [mcs](http://www.mono-project.com/docs/about-mono/languages/csharp/) see:`help ale-cs-mcs` for details, [mcsc](http://www.mono-project.com/docs/about-mono/languages/csharp/) !! see:`help ale-cs-mcsc` for details and configuration| | Chef | [foodcritic](http://www.foodcritic.io/) | | CMake | [cmakelint](https://github.com/richq/cmake-lint) | | CoffeeScript | [coffee](http://coffeescript.org/), [coffeelint](https://www.npmjs.com/package/coffeelint) | | Crystal | [crystal](https://crystal-lang.org/) !! | | CSS | [csslint](http://csslint.net/), [stylelint](https://github.com/stylelint/stylelint), [prettier](https://github.com/prettier/prettier) | | Cython (pyrex filetype) | [cython](http://cython.org/) | | D | [dmd](https://dlang.org/dmd-linux.html) | | Dart | [dartanalyzer](https://github.com/dart-lang/sdk/tree/master/pkg/analyzer_cli) !! | | Dockerfile | [hadolint](https://github.com/lukasmartinelli/hadolint) | | Elixir | [credo](https://github.com/rrrene/credo), [dogma](https://github.com/lpil/dogma) !! | | Elm | [elm-format](https://github.com/avh4/elm-format), [elm-make](https://github.com/elm-lang/elm-make) | | Erb | [erb](https://github.com/jeremyevans/erubi), [erubis](https://github.com/kwatch/erubis) | | Erlang | [erlc](http://erlang.org/doc/man/erlc.html), [SyntaxErl](https://github.com/ten0s/syntaxerl) | | Fortran | [gcc](https://gcc.gnu.org/) | | FusionScript | [fusion-lint](https://github.com/RyanSquared/fusionscript) | | GLSL | [glslang](https://github.com/KhronosGroup/glslang) | | Go | [gofmt](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) !! | | GraphQL | [gqlint](https://github.com/happylinks/gqlint) | | 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/), [stack-ghc](https://haskellstack.org/), [stack-build](https://haskellstack.org/) !!, [ghc-mod](https://github.com/DanielG/ghc-mod), [stack-ghc-mod](https://github.com/DanielG/ghc-mod), [hlint](https://hackage.haskell.org/package/hlint), [hdevtools](https://hackage.haskell.org/package/hdevtools), [hfmt](https://github.com/danstiner/hfmt) | | HTML | [HTMLHint](http://htmlhint.com/), [proselint](http://proselint.com/), [tidy](http://www.html-tidy.org/), [write-good](https://github.com/btford/write-good) | | Idris | [idris](http://www.idris-lang.org/) | | 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/), [prettier](https://github.com/prettier/prettier), prettier-eslint >= 4.2.0, prettier-standard, [standard](http://standardjs.com/), [xo](https://github.com/sindresorhus/xo) | JSON | [jsonlint](http://zaa.ch/jsonlint/), [prettier](https://github.com/prettier/prettier) | | 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/), [write-good](https://github.com/btford/write-good) | | LLVM | [llc](https://llvm.org/docs/CommandGuide/llc.html) | | Lua | [luacheck](https://github.com/mpeterv/luacheck) | | Mail | [proselint](http://proselint.com/), [vale](https://github.com/ValeLint/vale) | | Make | [checkmake](https://github.com/mrtazz/checkmake) | | Markdown | [mdl](https://github.com/mivok/markdownlint), [proselint](http://proselint.com/), [vale](https://github.com/ValeLint/vale), [remark-lint](https://github.com/wooorm/remark-lint) !!, [write-good](https://github.com/btford/write-good) | | MATLAB | [mlint](https://www.mathworks.com/help/matlab/ref/mlint.html) | | Nim | [nim check](https://nim-lang.org/docs/nimc.html) !! | | nix | [nix-instantiate](http://nixos.org/nix/manual/#sec-nix-instantiate) | | nroff | [proselint](http://proselint.com/), [write-good](https://github.com/btford/write-good)| | 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-ocaml-merlin` for configuration instructions | | Perl | [perl -c](https://perl.org/), [perl-critic](https://metacpan.org/pod/Perl::Critic) | | PHP | [hack](http://hacklang.org/), [hackfmt](https://github.com/facebook/flow/tree/master/hack/hackfmt), [langserver](https://github.com/felixfbecker/php-language-server), [phan](https://github.com/phan/phan) see `:help ale-php-phan` to instructions, [php -l](https://secure.php.net/), [phpcs](https://github.com/squizlabs/PHP_CodeSniffer), [phpmd](https://phpmd.org), [phpstan](https://github.com/phpstan/phpstan), [phpcbf](https://github.com/squizlabs/PHP_CodeSniffer) | | Pod | [proselint](http://proselint.com/), [write-good](https://github.com/btford/write-good) | | Pug | [pug-lint](https://github.com/pugjs/pug-lint) | | Puppet | [puppet](https://puppet.com), [puppet-lint](https://puppet-lint.com) | | 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/), [pycodestyle](https://github.com/PyCQA/pycodestyle), [pylint](https://www.pylint.org/) !!, [yapf](https://github.com/google/yapf) | | R | [lintr](https://github.com/jimhester/lintr) | | ReasonML | [merlin](https://github.com/the-lambda-church/merlin) see `:help ale-integration-reason-merlin` for configuration instructions, [refmt](https://github.com/reasonml/reason-cli) | | reStructuredText | [proselint](http://proselint.com/), [write-good](https://github.com/btford/write-good) | | RPM spec | [rpmlint](https://github.com/rpm-software-management/rpmlint) (disabled by default; see `:help ale-integration-spec`) | | Ruby | [brakeman](http://brakemanscanner.org/) !!, [rails_best_practices](https://github.com/flyerhzm/rails_best_practices) !!, [reek](https://github.com/troessner/reek), [rubocop](https://github.com/bbatsov/rubocop), [ruby](https://www.ruby-lang.org) | | Rust | cargo !! (see `:help ale-integration-rust` for configuration instructions), [rls](https://github.com/rust-lang-nursery/rls), [rustc](https://www.rust-lang.org/), [rustfmt](https://github.com/rust-lang-nursery/rustfmt) | | SASS | [sass-lint](https://www.npmjs.com/package/sass-lint), [stylelint](https://github.com/stylelint/stylelint) | | SCSS | [sass-lint](https://www.npmjs.com/package/sass-lint), [scss-lint](https://github.com/brigade/scss-lint), [stylelint](https://github.com/stylelint/stylelint), [prettier](https://github.com/prettier/prettier) | | Scala | [scalac](http://scala-lang.org), [scalastyle](http://www.scalastyle.org) | | Slim | [slim-lint](https://github.com/sds/slim-lint) | | SML | [smlnj](http://www.smlnj.org/) | | Solidity | [solium](https://github.com/duaraghav8/Solium) | | Stylus | [stylelint](https://github.com/stylelint/stylelint) | | SQL | [sqlint](https://github.com/purcell/sqlint) | | Swift | [swiftlint](https://github.com/realm/SwiftLint), [swiftformat](https://github.com/nicklockwood/SwiftFormat) | | Tcl | [nagelfar](http://nagelfar.sourceforge.net) !! | | Terraform | [tflint](https://github.com/wata727/tflint) | | Texinfo | [proselint](http://proselint.com/), [write-good](https://github.com/btford/write-good)| | Text^ | [proselint](http://proselint.com/), [vale](https://github.com/ValeLint/vale), [write-good](https://github.com/btford/write-good) | | Thrift | [thrift](http://thrift.apache.org/) | | TypeScript | [eslint](http://eslint.org/), [tslint](https://github.com/palantir/tslint), tsserver, typecheck, [prettier](https://github.com/prettier/prettier) | | 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/), [write-good](https://github.com/btford/write-good) | | XHTML | [proselint](http://proselint.com/), [write-good](https://github.com/btford/write-good) | | XML | [xmllint](http://xmlsoft.org/xmllint.html) | | YAML | [swaglint](https://github.com/byCedric/swaglint), [yamllint](https://yamllint.readthedocs.io/) | ## 2. Usage ### 2.i Linting Once this plugin is installed, while editing your files in supported languages and tools which have been correctly installed, this plugin will send the contents of your text buffers to a variety of programs for checking the syntax and semantics of your programs. By default, linters will be re-run in the background to check your syntax when you open new buffers or as you make edits to your files. The behaviour of linting can be configured with a variety of options, 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. ### 2.ii Fixing ALE can fix files with the `ALEFix` command. Functions need to be configured for different filetypes with the `g:ale_fixers` variable. For example, the following code can be used to fix JavaScript code with ESLint: ```vim " Put this in vimrc or a plugin file of your own. " After this is configured, :ALEFix will try and fix your JS code with ESLint. let g:ale_fixers = { \ 'javascript': ['eslint'], \} " Set this setting in vimrc if you want to fix files automatically on save. " This is off by default. let g:ale_fix_on_save = 1 ``` The `:ALEFixSuggest` command will suggest some supported tools for fixing code, but fixers can be also implemented with functions, including lambda functions too. See `:help ale-fix` for detailed information. ### 2.iii Completion ALE offers some support for completion via hijacking of omnicompletion while you type. All of ALE's completion information must come from Language Server Protocol linters, or similar protocols. At the moment, completion is only supported for TypeScript code with `tsserver`, when `tsserver` is enabled. You can enable completion like so: ```vim " Enable completion where available. let g:ale_completion_enabled = 1 ``` See `:help ale-completion` for more information. ## 3. Installation To install this plugin, you should use one of the following methods. For Windows users, replace usage of the Unix `~/.vim` directory with `%USERPROFILE%\vimfiles`, or another directory if you have configured Vim differently. On Windows, your `~/.vimrc` file will be similarly stored in `%USERPROFILE%\_vimrc`. ### 3.i. Installation with Vim package management In Vim 8 and NeoVim, you can install plugins easily without needing to use any other tools. Simply clone the plugin into your `pack` directory. #### Vim 8 on Unix ```bash mkdir -p ~/.vim/pack/git-plugins/start git clone https://github.com/w0rp/ale.git ~/.vim/pack/git-plugins/start/ale ``` #### NeoVim on Unix ```bash mkdir -p ~/.local/share/nvim/site/pack/git-plugins/start git clone https://github.com/w0rp/ale.git ~/.local/share/nvim/site/pack/git-plugins/start/ale ``` #### Vim 8 on Windows ```bash # Run these commands in the "Git for Windows" Bash terminal mkdir -p ~/vimfiles/pack/git-plugins/start git clone https://github.com/w0rp/ale.git ~/vimfiles/pack/git-plugins/start/ale ``` #### Generating Vim help files You can add the following line to your vimrc files to generate documentation tags automatically, if you don't have something similar already, so you can use the `:help` command to consult ALE's online documentation: ```vim " Put these lines at the very end of your vimrc file. " Load all plugins now. " Plugins need to be added to runtimepath before helptags can be generated. packloadall " Load all of the helptags now, after plugins have been loaded. " All messages and errors will be ignored. silent! helptags ALL ``` ### 3.ii. Installation with Pathogen To install this module with [Pathogen](https://github.com/tpope/vim-pathogen), you should clone this repository to your bundle directory, and ensure you have the line `execute pathogen#infect()` in your `~/.vimrc` file. You can run the following commands in your terminal to do so: ```bash cd ~/.vim/bundle git clone https://github.com/w0rp/ale.git ``` ### 3.iii. Installation with Vundle You can install this plugin using [Vundle](https://github.com/VundleVim/Vundle.vim) by using the path on GitHub for this repository. ```vim Plugin 'w0rp/ale' ``` See the Vundle documentation for more information. ## 4. Contributing If you would like to see support for more languages and tools, please [create an issue](https://github.com/w0rp/ale/issues) or [create a pull request](https://github.com/w0rp/ale/pulls). If your tool can read from stdin or you have code to suggest which is good, support can be happily added for it. If you are interested in the general direction of the project, check out the [wiki home page](https://github.com/w0rp/ale/wiki). The wiki includes a Roadmap for the future, and more. If you'd liked to discuss the project more directly, check out the `#vim-ale` channel on Freenode. Web chat is available [here](https://webchat.freenode.net/?channels=vim-ale). ## 5. FAQ ### 5.i. How do I disable particular linters? By default, all available tools for all supported languages will be run. If you want to only select a subset of the tools, simply create a `g:ale_linters` dictionary in your vimrc file mapping filetypes to lists of linters to run. ```vim let g:ale_linters = { \ 'javascript': ['eslint'], \} ``` For all languages unspecified in the dictionary, all possible linters will be run for those languages, just as when the dictionary is not defined. Running many linters should not typically obstruct editing in Vim, as they will all be executed in separate processes simultaneously. This plugin will look for linters in the [`ale_linters`](ale_linters) directory. Each directory within corresponds to a particular filetype in Vim, and each file in each directory corresponds to the name of a particular linter. ### 5.ii. How can I keep the sign gutter open? You can keep the sign gutter open at all times by setting the `g:ale_sign_column_always` to 1 ```vim let g:ale_sign_column_always = 1 ``` ### 5.iii. How can I change the signs ALE uses? Use these options to specify what text should be used for signs: ```vim let g:ale_sign_error = '>>' let g:ale_sign_warning = '--' ``` ALE sets some background colors automatically for warnings and errors in the sign gutter, with the names `ALEErrorSign` and `ALEWarningSign`. These colors can be customised, or even removed completely: ```vim highlight clear ALEErrorSign highlight clear ALEWarningSign ``` ### 5.iv. How can I show errors or warnings in my statusline? [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 " Set this. Airline will handle the rest. let g:airline#extensions#ale#enabled = 1 ``` 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`. Say you want to display all errors as one figure, and all non-errors as another figure. You can do the following: ```vim 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()} ``` See `:help ale#statusline#Count()` for more information. ### 5.v. How can I show errors or warnings in my lightline? [lightline](https://github.com/itchyny/lightline.vim) does not have built-in support for ALE, nevertheless it's easy to do it yourself: ```vim " This is regular lightline configuration, we just added " 'linter_warnings', 'linter_errors' and 'linter_ok' to " the active right panel. Feel free to move it anywhere. " `component_expand' and `component_type' are required. " " For more info on how this works, see lightline documentation. let g:lightline = { \ 'active': { \ 'right': [ [ 'lineinfo' ], \ [ 'percent' ], \ [ 'linter_warnings', 'linter_errors', 'linter_ok' ], \ [ 'fileformat', 'fileencoding', 'filetype' ] ] \ }, \ 'component_expand': { \ 'linter_warnings': 'LightlineLinterWarnings', \ 'linter_errors': 'LightlineLinterErrors', \ 'linter_ok': 'LightlineLinterOK' \ }, \ 'component_type': { \ 'linter_warnings': 'warning', \ 'linter_errors': 'error', \ 'linter_ok': 'ok' \ }, \ } autocmd User ALELint call lightline#update() " ale + lightline function! LightlineLinterWarnings() 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 ? '' : printf('%d --', all_non_errors) endfunction function! LightlineLinterErrors() 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 ? '' : printf('%d >>', all_errors) endfunction function! LightlineLinterOK() 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 ? '✓' : '' endfunction ``` See `:help ale#statusline#Count()` and [lightline documentation](https://github.com/itchyny/lightline.vim#advanced-configuration) for more information. ### 5.vi. How can I change the format for echo messages? There are 3 global options that allow customizing the echoed message. - `g:ale_echo_msg_format` where: * `%s` is the error message itself * `%linter%` is the linter name * `%severity` is the severity type - `g:ale_echo_msg_error_str` is the string used for error severity. - `g:ale_echo_msg_warning_str` is the string used for warning severity. So for example this: ```vim let g:ale_echo_msg_error_str = 'E' let g:ale_echo_msg_warning_str = 'W' let g:ale_echo_msg_format = '[%linter%] %s [%severity%]' ``` Will give you: ![Echoed message](img/echo.png) ### 5.vii. How can I execute some code when ALE stops linting? ALE runs its own [autocmd](http://vimdoc.sourceforge.net/htmldoc/autocmd.html) event whenever has a linter has been successfully executed and processed. This autocmd event can be used to call arbitrary functions after ALE stops linting. ```vim augroup YourGroup autocmd! autocmd User ALELint call YourFunction() augroup END ``` ### 5.viii. How can I navigate between errors quickly? ALE offers some commands with `` keybinds for moving between warnings and errors quickly. You can map the keys Ctrl+j and Ctrl+k to moving between errors for example: ```vim nmap (ale_previous_wrap) nmap (ale_next_wrap) ``` For more information, consult the online documentation with `:help ale-navigation-commands`. ### 5.ix. How can I run linters only when I save files? ALE offers an option `g:ale_lint_on_save` for enabling running the linters when files are saved. This option is enabled by default. If you only wish to run linters when files are saved, you can turn the other options off. ```vim " Write this in your vimrc file let g:ale_lint_on_text_changed = 'never' " You can disable this option too " if you don't want linters to run on opening a file let g:ale_lint_on_enter = 0 ``` If for whatever reason you don't wish to run linters again when you save files, you can set `g:ale_lint_on_save` to `0`. ### 5.x. How can I use the quickfix list instead of the loclist? The quickfix list can be enabled by turning the `g:ale_set_quickfix` option on. If you wish to also disable the loclist, you can disable the `g:ale_set_loclist` option. ```vim " Write this in your vimrc file let g:ale_set_loclist = 0 let g:ale_set_quickfix = 1 ``` If you wish to show Vim windows for the loclist or quickfix items when a file contains warnings or errors, `g:ale_open_list` can be set to `1`. `g:ale_keep_list_window_open` can be set to `1` if you wish to keep the window open even after errors disappear. ```vim let g:ale_open_list = 1 " Set this if you want to. " This can be useful if you are combining ALE with " some other plugin which sets quickfix errors, etc. let g:ale_keep_list_window_open = 1 ``` ### 5.xi. How can I check JSX files with both stylelint and eslint? 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 [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. ```vim augroup FiletypeGroup autocmd! au BufNewFile,BufRead *.jsx set filetype=javascript.jsx augroup END ``` Supposing the filetype has been set correctly, you can set the following options in your vimrc file: ```vim let g:ale_linters = {'jsx': ['stylelint', 'eslint']} let g:ale_linter_aliases = {'jsx': 'css'} ``` ALE will alias the `jsx` filetype so it uses the `css` filetype linters, and use the original Array of selected linters for `jsx` from the `g:ale_linters` object. All available linters will be used for the filetype `javascript`, and no linter will be run twice for the same file. ### 5.xii. Will this plugin eat all of my laptop battery power? ALE takes advantage of the power of various tools to check your code. This of course means that CPU time will be used to continuously check your code. If you are concerned about the CPU time ALE will spend, which will of course imply some cost to battery life, you can adjust your settings to make your CPU do less work. First, consider increasing the delay before which ALE will run any linters while you type. ALE uses a timeout which is cancelled and reset every time you type, and this delay can be increased so linters are run less often. See `:help g:ale_lint_delay` for more information. If you don't wish to run linters while you type, you can disable that behaviour. Set `g:ale_lint_on_text_changed` to `never` or `normal`. You won't get as frequent error checking, but ALE shouldn't block your ability to edit a document after you save a file, so the asynchronous nature of the plugin will 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 `:ALELint`.