path: root/doc/ale.txt

*ale.txt*  For Vim version 8.0.  Last change: 2016 October 10
*ale*

ALE - Asynchronous Lint Engine

===============================================================================
CONTENTS                                                         *ale-contents*

  1. Introduction.........................|ale-introduction|
  2. Supported Languages & Tools..........|ale-support|
  3. Global Options.......................|ale-options|
  4. Linter Specific Options..............|ale-linter-options|
    4.1.  eslint..........................|ale-linter-options-eslint|
    4.2.  flow............................|ale-linter-options-flow|
    4.3.  jshint..........................|ale-linter-options-jshint|
    4.4.  phpcs...........................|ale-linter-options-phpcs|
    4.5.  html-tidy.......................|ale-linter-options-html-tidy|
    4.6.  c-gcc...........................|ale-linter-options-c-gcc|
    4.7.  cpp-gcc.........................|ale-linter-options-cpp-gcc|
    4.8.  fortran-gcc.....................|ale-linter-options-fortran-gcc|
    4.9.  shell...........................|ale-linter-options-shell|
    4.10. shellcheck......................|ale-linter-options-shellcheck|
    4.11. vint............................|ale-linter-options-vint|
    4.12. luacheck........................|ale-linter-options-luacheck|
    4.13. c-cppcheck......................|ale-linter-options-c-cppcheck|
    4.14. cpp-cppcheck....................|ale-linter-options-cpp-cppcheck|
    4.15. htmlhint........................|ale-linter-options-htmlhint|
    4.16. c-clang.........................|ale-linter-options-c-clang|
    4.17. cpp-clang.......................|ale-linter-options-cpp-clang|
    4.18. python-flake8...................|ale-linter-options-python-flake8|
    4.19. ruby-rubocop....................|ale-linter-options-ruby-rubocop|
    4.20. chktex..........................|ale-linter-options-chktex|
    4.21. lacheck.........................|ale-linter-options-lacheck|
    4.22. stylelint.......................|ale-linter-options-stylelint|
    4.23. rustc...........................|ale-linter-options-rustc|
    4.24. python-mypy.....................|ale-linter-options-python-mypy|
    4.25. python-pylint...................|ale-linter-options-python-pylint|
    4.26. erlang..........................|ale-linter-options-erlang|
    4.27. phpmd...........................|ale-linter-options-phpmd|
    4.28. xo..............................|ale-linter-options-xo|
    4.28. javac...........................|ale-linter-options-javac|
  5. Linter Integration Notes.............|ale-linter-integration|
    5.1.  merlin..........................|ale-linter-integration-ocaml-merlin|
    5.2. rust.............................|ale-integration-rust|
  6. Commands/Keybinds....................|ale-commands|
  7. API..................................|ale-api|
  8. Special Thanks.......................|ale-special-thanks|
  9. Contact..............................|ale-contact|

===============================================================================
1. Introduction                                              *ale-introduction*

ALE provides the means to run linters asynchronously in Vim in a variety of
languages and tools. ALE sends the contents of buffers to linter programs
using the |job-control| features available in Vim 8 and NeoVim. For Vim 8,
Vim must be compiled with the |job| and |channel| and |timer| features
as a minimum.

ALE supports the following key features:

1. Running linters when text is changed.
2. Running linters when files are opened.
3. Running linters when files are saved. (When a global flag is set.)
4. Populating the |loclist| with warning and errors.
5. Setting |signs| with warnings and errors for error markers.
6. Using |echo| to show error messages when the cursor moves.

===============================================================================
2. Supported Languages & Tools                                    *ale-support*

The following languages and tools are supported.

* Ansible: 'ansible-lint'
* Bash: 'shell' (-n flag), 'shellcheck'
* Bourne Shell: 'shell' (-n flag), 'shellcheck'
* C: 'cppcheck', 'gcc', 'clang'
* C++ (filetype cpp): 'cppcheck', 'gcc', 'clang'
* C#: 'mcs'
* Chef: 'foodcritic'
* CoffeeScript: 'coffee', 'coffelint'
* CSS: 'csslint', 'stylelint'
* Cython (pyrex filetype): 'cython'
* D: 'dmd'
* Dockerfile: 'hadolint'
* Elixir: 'credo'
* Elm: 'elm-make'
* Erlang: 'erlc'
* Fortran: 'gcc'
* Go: 'gofmt -e', 'go vet', 'golint', 'go build'
* Haskell: 'ghc', 'hlint'
* HTML: 'HTMLHint', 'tidy'
* Java: 'javac'
* JavaScript: 'eslint', 'jscs', 'jshint', 'flow', 'xo'
* JSON: 'jsonlint'
* LaTeX: 'chktex', 'lacheck'
* Lua: 'luacheck'
* Markdown: 'mdl'
* MATLAB: 'mlint'
* OCaml: 'merlin' (see |ale-linter-integration-ocaml-merlin|)
* Perl: 'perl' (-c flag), 'perlcritic'
* PHP: 'hack', 'php' (-l flag), 'phpcs', 'phpmd'
* Pug: 'pug-lint'
* Puppet: 'puppet', 'puppet-lint'
* Python: 'flake8', 'mypy', 'pylint'
* Rust: 'rustc' (see |ale-integration-rust|)
* Ruby: 'rubocop'
* SASS: 'sasslint', 'stylelint'
* SCSS: 'sasslint', 'scsslint', 'stylelint'
* Scala: 'scalac'
* Swift: 'swiftlint'
* Tex: 'proselint'
* Text: 'proselint'
* TypeScript: 'tslint', 'typecheck'
* Verilog: 'iverilog', 'verilator'
* Vim: 'vint'
* YAML: 'yamllint'

===============================================================================
3. Global Options                                                 *ale-options*

g:airline#extensions#ale#enabled             *g:airline#extensions#ale#enabled*

  Type: |Number|
  Default: `1`

  Enables or disables the |airline|'s native extension for ale, which displays
  warnings and errors in the status line, prefixed by
  |airline#extensions#ale#error_symbol| and
  |airline#extensions#ale#warning_symbol|.


g:ale_echo_cursor                                           *g:ale_echo_cursor*

  Type: |Number|
  Default: `1`

  When this option is set to `1`, a truncated message will be echoed when a
  cursor is near a warning or error. ALE will attempt to find the warning or
  error at a column nearest to the cursor when the cursor is resting on a line
  which contains a warning or error. This option can be set to `0` to disable
  this behaviour.
  The format of the message can be customizable in |g:ale_echo_msg_format|.


g:ale_echo_msg_error_str                             *g:ale_echo_msg_error_str*

  Type: |String|
  Default: `Error`

  The string used for error severity in the echoed message.
  Note |`g:ale_echo_cursor`| should be set to 1
  Note |`g:ale_echo_msg_format`| should contain the `%severity%` handler


g:ale_echo_msg_format                                   *g:ale_echo_msg_format*

  Type: |String|
  Default: `%s`

  This variable defines the format of the echoed message. The `%s` is the
  error message itself, and it can contain the following handlers:
  - `%linter%` for linter's name
  - `%severity%` for the type of severity
  Note |`g:ale_echo_cursor`| should be setted to 1


g:ale_echo_msg_warning_str                         *g:ale_echo_msg_warning_str*

  Type: |String|
  Default: `Warning`

  The string used for warning severity in the echoed message.
  Note |`g:ale_echo_cursor`| should be set to 1
  Note |`g:ale_echo_msg_format`| should contain the `%severity%` handler


g:ale_keep_list_window_open                       *g:ale_keep_list_window_open*

  Type: |Number|
  Default: `0`

  When set to `1`, this option will keep the loclist or quickfix windows
  event after all warnings/errors have been removed for files. By default
  the loclist or quicfix windows will be closed automatically when there
  are no warnings or errors.

  See: |g:ale_open_list|


g:ale_lint_delay                                             *g:ale_lint_delay*

  Type: |Number|
  Default: `200`

  This variable controls the milliseconds delay after which the linters will
  be run after text is changed. This option is only meaningful with the
  |g:ale_lint_on_text_changed| variable set to `1`.


g:ale_lint_on_enter                                       *g:ale_lint_on_enter*

  Type: |Number|
  Default: `1`

  When this option is set to `1`, the |BufEnter| and |BufRead| events will be
  used to apply linters when buffers are first opened. If this is not desired,
  this variable can be set to `0` in your vimrc file to disable this
  behaviour.


g:ale_lint_on_save                                         *g:ale_lint_on_save*

  Type: |Number|
  Default: `0`

  This option will make ALE run the linters whenever a file is saved when it
  it set to `1` in your vimrc file. This option can be used in combination
  with the |g:ale_lint_on_enter| and |g:ale_lint_on_text_changed| options to
  make ALE only check files after that have been saved, if that is what is
  desired.


g:ale_lint_on_text_changed                         *g:ale_lint_on_text_changed*

  Type: |Number|
  Default: `1`

  By default, ALE will check files with the various supported programs when
  text is changed by using the |TextChanged| event. If this behaviour is not
  desired, then this option can be disabled by setting it to 0. The
  |g:ale_lint_delay| variable will be used to set a |timer_start()| on a
  delay, and each change to a file will continue to call |timer_stop()| and
  |timer_start()| repeatedly until the timer ticks by, and the linters will be
  run. The checking of files will run in the background, so it should not
  inhibit editing files.


g:ale_linter_aliases                                     *g:ale_linter_aliases*

  Type: |Dictionary|
  Default: `{}`

  The |g:ale_linter_aliases| option can be used to set aliases from one
  filetype to another. A given filetype can be mapped to use the linters
  run for another given filetype.

  This |Dictionary| will be merged with a default dictionary containing the
  following values: >

  {
  \   'zsh': 'sh',
  \   'csh': 'sh',
  \}
<
  For example, if you wish to map a new filetype `'foobar'` to run the `'php'`
  linters, you could set the following: >

  let g:ale_linter_aliases = {'foobar': 'php'}
<
  When combined with the |g:ale_linters| option, the original filetype
  (`'foobar'`) will be used for determining which linters to run,
  not the aliased type (`'php'`). This allows an aliased type to run a
  different set of linters from the type it is being mapped to.


g:ale_linters                                                   *g:ale_linters*

  Type: |Dictionary|
  Default: `{}`

  The |g:ale_linters| option sets a |Dictionary| mapping a filetype
  to a |List| of linter programs to be run when checking particular filetypes.
  Only the filetypes specified in the dictionary will be limited in terms
  of which linters will be run.

  This |Dictionary| will be merged with a default dictionary containing the
  following values: >

  {
  \   'zsh': ['shell'],
  \   'csh': ['shell'],
  \}
<
  This option can be used to enable only a particular set of linters for a
  file. For example, you can enable only 'eslint' for JavaScript files: >

  let g:ale_linters = {'javascript': ['eslint']}
<
  If you want to disable all linters for a particular filetype, you can pass
  an empty list of linters as the value: >

  let g:ale_linters = {'javascript': []}
<
  All linters available for a given filetype can be enabled by using the
  string `'all'`: >

  let g:ale_linters = {'c': 'all'}
<

g:ale_open_list                                               *g:ale_open_list*

  Type: |Number|
  Default: `0`

  When set to `1`, this will cause ALE to automatically open a window for
  the loclist (|lopen|) or for the quickfix list instead if
  |g:ale_set_quickfix| is `1`. (|copen|)

  The window will be kept open until all warnings or errors are cleared,
  including those not set by ALE, unless |g:ale_keep_list_window_open| is set
  to `1`, in which case the window will be kept open until closed manually.


g:ale_set_loclist                                           *g:ale_set_loclist*

  Type: |Number|
  Default: `1`

  When this option is set to `1`, the |loclist| will be populated with any
  warnings and errors which are found by ALE. This feature can be used to
  implement jumping between errors through typical use of |lnext| and |lprev|.


g:ale_set_quickfix                                         *g:ale_set_quickfix*

  Type: |Number|
  Default: `0`

  When this option is set to `1`, the |quickfix| list will be populated with any
  warnings and errors which are found by ALE, instead of the |loclist|. The
  loclist will never be populated when this option is on.


g:ale_set_signs                                               *g:ale_set_signs*

  Type: |Number|
  Default: `has('signs')`

  When this option is set to `1`, the |sign| column will be populated with
  signs marking where errors and warnings appear in the file. The
  `ALEErrorSign` and `ALEWarningSign` highlight groups will be used to provide
  highlighting for the signs. The text used for signs can be customised with
  the |g:ale_sign_error| and |g:ale_sign_warning| options.


g:ale_sign_column_always                             *g:ale_sign_column_always*

  Type: |Number|
  Default: `0`

  By default, the sign gutter will disappear when all warnings and errors have
  been fixed for a file. When this option is set to `1`, the sign column will
  remain open. This can be preferable if you don't want the text in your file
  to move around as you edit a file.


g:ale_sign_error                                             *g:ale_sign_error*

  Type: |String|
  Default: `'>>'`

  This string can be changed to change the characters used for the sign gutter
  for lines which at least one error on them. Lines with both errors and
  warnings on them will show the error marker, as errors take precedence.


g:ale_sign_offset                                           *g:ale_sign_offset*

  Type: |Number|
  Default: `1000000`

  This variable controls offset from which numeric IDs will be generated for
  new signs. Signs cannot share the same ID values, so when two Vim plugins
  set signs at the same time, the IDs have to be configured such that they do
  not conflict with one another. If the IDs used by ALE are found to conflict
  with some other plugin, this offset value can be changed, and hopefully both
  plugins will work together. See |sign-place| for more information on how
  signs are set.


g:ale_sign_warning                                         *g:ale_sign_warning*

  Type: |String|
  Default: `'--'`

  This string can be changed to change the characters used for the sign gutter
  for lines which at least one warning on them.


g:ale_statusline_format                               *g:ale_statusline_format*

  Type: |List|
  Default: `['%d error(s)', '%d warning(s)', 'OK']`

  This variable defines the format of |`ale#statusline#status()`| output.
  - The 1st element is for errors
  - The 2nd element is for warnings
  - The 3rd element is for when no errors are detected


g:ale_warn_about_trailing_whitespace     *g:ale_warn_about_trailing_whitespace*

  Type: |Number|
  Default: `1`

  When this option is set to `1`, warnings relating to trailing whitespace on
  lines will be shown in signs, the loclist, and echo messages, etc. If these
  errors are found to be too irritating while edits are being made, and you
  have configured Vim to automatically remove trailing whitespace, then you
  can disable these warnings for some linters by setting this option to `0`.

  Not all linters may respect this option. If a linter does not, please file a
  bug report, and it may be possible to add such support.


===============================================================================
4. Linter Specific Options                                 *ale-linter-options*

Some linters have specific options which can be configured for each of them,
for customising their behaviour.

-------------------------------------------------------------------------------
4.1. eslint                                         *ale-linter-options-eslint*

g:ale_javascript_eslint_executable         *g:ale_javascript_eslint_executable*

  Type: |String|
  Default: `'eslint'`

  ALE will first discover the eslint path in an ancestor node_modules
  directory. If no such path exists, this variable will be used instead.

  This variable can be set to change the path to eslint. If you have eslint_d
  installed, you can set this option to use eslint_d instead.

  If you wish to use only a globally installed version of eslint, set
  |g:ale_javascript_eslint_use_global| to `1`.


g:ale_javascript_eslint_options               *g:ale_javascript_eslint_options*

  Type: |String|
  Default: `''`

  This variable can be set to pass additional options to eslint.


g:ale_javascript_eslint_use_global         *g:ale_javascript_eslint_use_global*

  Type: |String|
  Default: `0`

  This variable controls whether or not ALE will search for a local path for
  eslint first. If this variable is set to `1`, then ALE will always use the
  global version of eslint, in preference to locally installed versions of
  eslint in node_modules.

-------------------------------------------------------------------------------
4.2. flow                                             *ale-linter-options-flow*

g:ale_javascript_flow_executable             *g:ale_javascript_flow_executable*

  Type: |String|
  Default: `'flow'`

  ALE will first discover the flow path in an ancestor node_modules
  directory. If no such path exists, this variable will be used instead.

  If you wish to use only a globally installed version of flow, set
  |g:ale_javascript_flow_use_global| to `1`.


g:ale_javascript_flow_use_global             *g:ale_javascript_flow_use_global*

  Type: |String|
  Default: `0`

  This variable controls whether or not ALE will search for a local path for
  flow first. If this variable is set to `1`, then ALE will always use the
  global version of flow, in preference to locally installed versions of
  flow in node_modules.

-------------------------------------------------------------------------------
4.3. jshint                                         *ale-linter-options-jshint*

g:ale_javascript_jshint_executable         *g:ale_javascript_jshint_executable*

  Type: |String|
  Default: `'jshint'`

  ALE will first discover the jshint path in an ancestor node_modules
  directory. If no such path exists, this variable will be used instead.

  This variable can be changed to change the path to jshint.

  If you wish to use only a globally installed version of jshint, set
  |g:ale_javascript_jshint_use_global| to `1`.


g:ale_javascript_jshint_use_global         *g:ale_javascript_jshint_use_global*

  Type: |String|
  Default: `0`

  This variable controls whether or not ALE will search for a local path for
  jshint first. If this variable is set to `1`, then ALE will always use the
  global version of jshint, in preference to locally installed versions of
  jshint in node_modules.

-------------------------------------------------------------------------------
4.4. phpcs                                           *ale-linter-options-phpcs*

g:ale_php_phpcs_standard                             *g:ale_php_phpcs_standard*

  Type: |String|
  Default: `''`

  This variable can be set to specify the coding standard used by phpcs. If no
  coding standard is specified, phpcs will default to checking against the
  PEAR coding standard, or the standard you have set as the default.

-------------------------------------------------------------------------------
4.5. html-tidy                                   *ale-linter-options-html-tidy*

g:ale_html_tidy_executable                         *g:ale_html_tidy_executable*

  Type: |String|
  Default: `'tidy'`

  This variable can be changed to change the path to tidy.


g:ale_html_tidy_args                                     *g:ale_html_tidy_args*

  Type: |String|
  Default: `'-q -e -language en'`

  This variable can be changed to change the arguments provided to the
  executable.

  ALE will attempt to automatically detect the appropriate file encoding to
  provide to html-tidy, and fall back to UTF-8 when encoding detection fails.

  The recognized file encodings are as follows: ascii, big5, cp1252 (win1252),
  cp850 (ibm858), cp932 (shiftjis), iso-2022-jp (iso-2022), latin1, macroman
  (mac), sjis (shiftjis), utf-16le, utf-16, utf-8

-------------------------------------------------------------------------------
4.6. c-gcc                                           *ale-linter-options-c-gcc*

g:ale_c_gcc_options                                       *g:ale_c_gcc_options*

  Type: |String|
  Default: `'-std=c11 -Wall'`

  This variable can be change to modify flags given to gcc.

-------------------------------------------------------------------------------
4.7. cpp-gcc                                       *ale-linter-options-cpp-gcc*

g:ale_cpp_gcc_options                                   *g:ale_cpp_gcc_options*

  Type: |String|
  Default: `'-std=c++14 -Wall'`

  This variable can be changed to modify flags given to gcc.

-------------------------------------------------------------------------------
4.8. fortran-gcc                               *ale-linter-options-fortran-gcc*

g:ale_fortran_gcc_options                           *g:ale_fortran_gcc_options*

  Type: |String|
  Default: `'-Wall'`

  This variable can be changed to modify flags given to gcc.

-------------------------------------------------------------------------------
4.9. shell                                           *ale-linter-options-shell*

g:ale_linters_sh_shell_default_shell     *g:ale_linters_sh_shell_default_shell*

  Type: |String|
  Default: The current shell (`$SHELL`) or `'bash'` if that cannot be read.

  When ALE runs the linter for shells with the `-n` flag, it will attempt to
  read the shell from the shebang (`#!`) line from the shell script to
  determine the shell program to run. When this detection fails, this variable
  will be used instead.

-------------------------------------------------------------------------------
4.10. shellcheck                                *ale-linter-options-shellcheck*

g:ale_linters_sh_shellckeck_exclusions *g:ale_linters_sh_shellckeck_exclusions*

  Type: |String|
  Default: `''`

  Set this variable to exclude test(s) for shellcheck (-e/--exclude option).

-------------------------------------------------------------------------------
4.11. vint                                            *ale-linter-options-vint*

g:ale_vim_vint_show_style_issues             *g:ale_vim_vint_show_style_issues*

  Type: |Number|
  Default: `1`

  This variable will enable/disable style issues for Vint. When this option
  is disabled, only warnings and errors which are not purely style issues
  will be reported.

-------------------------------------------------------------------------------
4.12. luacheck                                    *ale-linter-options-luacheck*

g:ale_lua_luacheck_executable                   *g:ale_lua_luacheck_executable*

  Type: |String|
  Default: `'luacheck'`

  This variable can be changed to change the path to luacheck.

-------------------------------------------------------------------------------
4.13. c-cppcheck                                *ale-linter-options-c-cppcheck*

g:ale_c_cppcheck_options                             *g:ale_c_cppcheck_options*

  Type: |String|
  Default: `'--enable=style'`

  This variable can be changed to modify flags given to cppcheck.

-------------------------------------------------------------------------------
4.14. cpp-cppcheck                            *ale-linter-options-cpp-cppcheck*

g:ale_cpp_cppcheck_options                         *g:ale_cpp_cppcheck_options*

  Type: |String|
  Default: `'--enable=style'`

  This variable can be changed to modify flags given to cppcheck.

-------------------------------------------------------------------------------
4.15. htmlhint                                    *ale-linter-options-htmlhint*

g:ale_html_htmlhint_options                       *g:ale_html_htmlhint_options*

  Type: |String|
  Default: `'--format=unix'`

  This variable can be changed to modify flags given to HTMLHint.


g:ale_html_htmlhint_executable                   *g:ale_html_htmlhint_executable*

  Type: |String|
  Default: `'htmlhint'`

  ALE will first discover the htmlhint path in an ancestor node_modules
  directory. If no such path exists, this variable will be used instead.

  If you wish to use only a globally installed version of htmlhint, set
  |g:ale_html_htmlhint_use_global| to `1`.


g:ale_html_htmlhint_use_global                   *g:ale_html_htmlhint_use_global*

  Type: |String|
  Default: `0`

  This variable controls whether or not ALE will search for a local path for
  htmlhint first. If this variable is set to `1`, then ALE will always use the
  global version of htmlhint, in preference to locally installed versions of
  htmlhint in node_modules.

-------------------------------------------------------------------------------
4.16. c-clang                                      *ale-linter-options-c-clang*

g:ale_c_clang_options                                   *g:ale_c_clang_options*

  Type: |String|
  Default: `'-std=c11 -Wall'`

  This variable can be change to modify flags given to clang.

-------------------------------------------------------------------------------
4.17. cpp-clang                                  *ale-linter-options-cpp-clang*

g:ale_cpp_clang_options                               *g:ale_cpp_clang_options*

  Type: |String|
  Default: `'-std=c11 -Wall'`

  This variable can be change to modify flags given to clang.

-------------------------------------------------------------------------------
4.18. python-flake8                          *ale-linter-options-python-flake8*

g:ale_python_flake8_executable                 *g:ale_python_flake8_executable*

  Type: |String|
  Default: `'flake8'`

  This variable can be changed to modify the executable used for flake8.


g:ale_python_flake8_args                             *g:ale_python_flake8_args*

  Type: |String|
  Default: `''`

  This variable can be changed to add command-line arguments to the flake8
  invocation.

  For example, to dynamically switch between programs targeting Python 2 and
  Python 3, you may want to set >

  let g:ale_python_flake8_executable = 'python3'   " or 'python' for Python 2
  let g:ale_python_flake8_args = '-m flake8'
<
  after making sure it's installed for the appropriate Python versions (e.g.
  `python3 -m pip install --user flake8`).

-------------------------------------------------------------------------------
4.19. ruby-rubocop                            *ale-linter-options-ruby-rubocop*

g:ale_ruby_rubocop_options                         *g:ale_ruby_rubocop_options*

  Type: |String|
  Default: `''`

  This variable can be change to modify flags given to rubocop.

-------------------------------------------------------------------------------
4.20. chktex                                        *ale-linter-options-chktex*

g:ale_tex_chktex_executable                       *g:ale_tex_chktex_executable*

  Type: |String|
  Default: `'chktex'`

  This variable can be changed to change the path to chktex.


g:ale_tex_chktex_options                             *g:ale_tex_chktex_options*

  Type: |String|
  Default: `'-I'`

  This variable can be changed to modify flags given to chktex.

------------------------------------------------------------------------------
4.21. lacheck                                     *ale-linter-options-lacheck*

g:ale_lacheck_executable                            *g:ale_lacheck_executable*

  Type: |String|
  Default: '`lacheck`'

  This variable can be changed to change the path to lacheck.

-------------------------------------------------------------------------------
4.22. stylelint                                    *ale-linter-options-stylelint*

g:ale_css_stylelint_executable                   *g:ale_css_stylelint_executable*

  Type: |String|
  Default: `'stylelint'`

  ALE will first discover the stylelint path in an ancestor node_modules
  directory. If no such path exists, this variable will be used instead.

  If you wish to use only a globally installed version of stylelint, set
  |g:ale_css_stylelint_use_global| to `1`.


g:ale_css_stylelint_use_global                   *g:ale_css_stylelint_use_global*

  Type: |String|
  Default: `0`

  This variable controls whether or not ALE will search for a local path for
  stylelint first. If this variable is set to `1`, then ALE will always use the
  global version of stylelint, in preference to locally installed versions of
  stylelint in node_modules.


g:ale_sass_stylelint_executable                 *g:ale_sass_stylelint_executable*

  Type: |String|
  Default: `'stylelint'`

  ALE will first discover the stylelint path in an ancestor node_modules
  directory. If no such path exists, this variable will be used instead.

  If you wish to use only a globally installed version of stylelint, set
  |g:ale_sass_stylelint_use_global| to `1`.


g:ale_sass_stylelint_use_global                 *g:ale_sass_stylelint_use_global*

  Type: |String|
  Default: `0`

  This variable controls whether or not ALE will search for a local path for
  stylelint first. If this variable is set to `1`, then ALE will always use the
  global version of stylelint, in preference to locally installed versions of
  stylelint in node_modules.


g:ale_scss_stylelint_executable                 *g:ale_scss_stylelint_executable*

  Type: |String|
  Default: `'stylelint'`

  ALE will first discover the stylelint path in an ancestor node_modules
  directory. If no such path exists, this variable will be used instead.

  If you wish to use only a globally installed version of stylelint, set
  |g:ale_scss_stylelint_use_global| to `1`.


g:ale_scss_stylelint_use_global                 *g:ale_scss_stylelint_use_global*

  Type: |String|
  Default: `0`

  This variable controls whether or not ALE will search for a local path for
  stylelint first. If this variable is set to `1`, then ALE will always use the
  global version of stylelint, in preference to locally installed versions of
  stylelint in node_modules.

------------------------------------------------------------------------------
4.23. rustc                                         *ale-linter-options-rustc*

g:ale_rust_ignore_error_codes                  *g:ale_rust_ignore_error_codes*

  Type: |List| of |String|s
  Default: []

  This variable can contain error codes which will be ignored. For example, to
  ignore most errors regarding failed imports, put this in your .vimrc
  >
  let g:ale_rust_ignore_error_codes = ['E0432', 'E0433']


-------------------------------------------------------------------------------
4.24. python-mypy                              *ale-linter-options-python-mypy*

g:ale_python_mypy_options                           *g:ale_python_mypy_options*

  Type: |String|
  Default: `''`

  This variable can be changed to add command-line arguments to the mypy
  invocation.


-------------------------------------------------------------------------------
4.25. python-pylint                          *ale-linter-options-python-pylint*

g:ale_python_pylint_executable                 *g:ale_python_pylint_executable*

  Type: |String|
  Default: `'pylint'`

  This variable can be changed to modify the executable used for pylint.


g:ale_python_pylint_options                       *g:ale_python_pylint_options*

  Type: |String|
  Default: `''`

  This variable can be changed to add command-line arguments to the pylint
  invocation.

  For example, to dynamically switch between programs targeting Python 2 and
  Python 3, you may want to set >

  let g:ale_python_pylint_executable = 'python3'   " or 'python' for Python 2
  let g:ale_python_pylint_options = '-rcfile /path/to/pylint.rc'

  after making sure it's installed for the appropriate Python versions (e.g.
  `python3 -m pip install --user pylint`).

------------------------------------------------------------------------------
4.26. erlang                                        *ale-linter-options-erlang*

g:ale_erlang_erlc_options                           *g:ale_erlang_erlc_options*

  Type: |String|
  Default: '`''`'

  This variable controls additional parameters passed to `erlc`, such as `-I`
  or `-pa`.

------------------------------------------------------------------------------
4.27. phpmd                                       *ale-linter-options-phpmd*

g:ale_php_phpmd_ruleset                           *g:ale_php_phpmd_ruleset*

  Type: |String|
  Default: 'cleancode,codesize,controversial,design,naming,unusedcode'

  This variable controls the ruleset used by phpmd.  Default is to use all of
  the available phpmd rulesets

------------------------------------------------------------------------------
4.28. xo                                             *ale-linter-options-xo*

g:ale_javascript_xo_executable              *g:ale_javascript_xo_executable*

  Type: |String|
  Default: `'xo'`

  ALE will first discover the xo path in an ancestor node_modules
  directory. If no such path exists, this variable will be used instead.

  This variable can be set to change the path to xo.

  If you wish to use only a globally installed version of xo, set
  |g:ale_javascript_xo_use_global| to `1`.


g:ale_javascript_xo_options                   *g:ale_javascript_xo_options*

  Type: |String|
  Default: `''`

  This variable can be set to pass additional options to xo.


g:ale_javascript_xo_use_global             *g:ale_javascript_xo_use_global*

  Type: |String|
  Default: `0`

  This variable controls whether or not ALE will search for a local path for
  xo first. If this variable is set to `1`, then ALE will always use the
  global version of xo, in preference to locally installed versions of
  xo in node_modules.

------------------------------------------------------------------------------
4.28. javac                                          *ale-linter-options-javac*

g:ale_java_javac_classpath                         *g:ale_java_javac_classpath*

  Type: |String|
  Default: `''`

  This variable can be set to change the global classpath for Java.


g:ale_java_javac_options                             *g:ale_java_javac_options*

  Type: |String|
  Default: `''`

  This variable can be set to pass additional options to javac.

===============================================================================
5. Linter Integration Notes                            *ale-linter-integration*

Some linters may have requirements for some other plugins being installed.

-------------------------------------------------------------------------------
5.1. ocaml-merlin                                *ale-integration-ocaml-merlin*

  To use merlin linter for OCaml source code you need to make sure Merlin for
  Vim is correctly configured. See the corresponding Merlin wiki page for
  detailed instructions
  (https://github.com/the-lambda-church/merlin/wiki/vim-from-scratch).

-------------------------------------------------------------------------------
5.2. rust                                                *ale-integration-rust*

  Since Vim does not detect the rust file type out-of-the-box, you need the
  runtime files for rust from here: https://github.com/rust-lang/rust.vim

  Note that there are two possible linters for rust files:

  1. rustc -- The Rust compiler is used to check the currently edited file.
     So, if your project consists of multiple files, you will get some errors
     when you use e.g. a struct which is defined in another file. You can use
     |g:ale_rust_ignore_error_codes| to ignore some of these errors.
  2. cargo -- If your project is managed by Cargo, the whole project is
     checked. That means that all errors are properly shown, but cargo can
     only operate on the files written on disk. That means it is highly
     recommended to turn off |g:ale_lint_on_text_changed| and to turn on
     |g:ale_lint_on_save|.

  Also note that rustc 1.12. or later is needed.

===============================================================================
6. Commands/Keybinds                                             *ale-commands*

ALEPrevious                                                       *ALEPrevious*
ALEPreviousWrap                                               *ALEPreviousWrap*
ALENext                                                               *ALENext*
ALENextWrap                                                       *ALENextWrap*
                                                      *ale-navigation-commands*

  Move between warnings or errors in a buffer.

  `ALEPrevious` and `ALENext` will stop at the top and bottom of a file, while
  `ALEPreviousWrap` and `ALENextWrap` will wrap around the file to find
  the last or first warning or error in the file, respectively.

  The following |<Plug>| mappings are defined for the commands: >
  <Plug>(ale_previous) - ALEPrevious
  <Plug>(ale_previous_wrap) - ALEPreviousWrap
  <Plug>(ale_next) - ALENext
  <Plug>(ale_next_wrap) - ALENextWrap
<
  For example, these commands could be bound to the keys Ctrl + j
  and Ctrl + k: >

  " Map movement through errors without wrapping.
  nmap <silent> <C-k> <Plug>(ale_previous)
  nmap <silent> <C-j> <Plug>(ale_next)
  " OR map keys to use wrapping.
  nmap <silent> <C-k> <Plug>(ale_previous_wrap)
  nmap <silent> <C-j> <Plug>(ale_next_wrap)
<

===============================================================================
7. API                                                                *ale-api*

ale#Queue(delay)                                                  *ale#Queue()*
  Run linters for the current buffer, based on the filetype of the buffer,
  with a given `delay`. A `delay` of `0` will run the linters immediately.
  The linters will always be run in the background. Calling this function
  again from the same buffer


ale#engine#EscapeCommandPart(command_part)     *ale#engine#EscapeCommandPart()*

  Given a |String|, return a |String| with all `%` characters replaced with
  `%%` instead. This function can be used to escape strings which are
  dynamically generated for commands before handing them over to ALE,
  so that ALE doesn't treat any strings with `%` formatting sequences
  specially.


ale#engine#GetLoclist(buffer)                         *ale#engine#GetLoclist()*

  Given a buffer number, this function will rerurn the list of warnings and
  errors reported by ALE for a given buffer in the format accepted by
  |setqflist()|.


ale#engine#ManageFile(buffer, filename)               *ale#engine#ManageFile()*

  Given a buffer number for a buffer currently running some linting tasks
  and a filename, register a filename with ALE for automatic deletion after
  linting is complete, or when Vim exits.

  If Vim exits suddenly, ALE will try its best to remove temporary files, but
  ALE cannot guarantee with absolute certainty that the files will be removed.
  It is advised to create temporary files in the operating system's managed
  temporary file directory, such as with |tempname()|.

  Directory names should not be given to this function. ALE will only delete
  files and symlinks given to this function. This is to prevent entire
  directories from being accidentally deleted, say in cases of writing
  `dir . '/' . filename` where `filename` is actually `''`, etc. ALE instead
  manages directories separetly with the |ale#engine#ManageDirectory| function.


ale#engine#ManageDirectory(buffer, directory)    *ale#engine#ManageDirectory()*

  Like |ale#engine#ManageFile()|, but directories and all of their contents
  will be deleted, akin to `rm -rf directory`, which could lead to loss of
  data if mistakes are made. This command will also delete any temporary
  filenames given to it.

  It is advised to use |ale#engine#ManageFile()| instead for deleting single
  files.


ale#linter#Define(filetype, linter)                       *ale#linter#Define()*
  Given a |String| for a filetype and a |Dictionary| Describing a linter
  configuration, add a linter for the given filetype. The dictionaries each
  offer the following options:

  `name`                   The name of the linter. These names will be used by
                         |g:ale_linters| option for enabling/disabling
                         particular linters.

                         This argument is required.

  `callback`               A |String| or |Funcref| for a callback function
                         accepting two arguments (buffer, lines), for a
                         buffer number the output is for, and the lines of
                         output from a linter.

                         This callback function should return a |List| of
                         |Dictionary| objects in the format accepted by
                         |setqflist()|. The |List| will be sorted by line and
                         then column order so it can be searched with a binary
                         search by in future before being passed on to the
                         |loclist|, etc.

                         This argument is required.

  `executable`             A |String| naming the executable itself which
                         will be run.  This value will be used to check if the
                         program requested is installed or not.

                         Either this or the `executable_callback` argument
                         must be provided.

  `executable_callback  `  A |String| or |Funcref| for a callback function
                         accepting a buffer number. A |String| should be
                         returned for the executable to check. This can be
                         used in place of `executable` when more complicated
                         processing is needed.

  `command`                A |String| for an  executable to run asynchronously.
                         This command will be fed the lines from the buffer to
                         check, and will produce the lines of output given to
                         the `callback`.

  `command_callback`       A |String| or |Funcref| for a callback function
                         accepting a buffer number. A |String| should be
                         returned for a command to run. This can be used in
                         place of `command` when more complicated processing
                         is needed.

                         If an empty string is returned from the callback,
                         no jobs for linting will be run for that linter.
                         This can be used for skipping a linter call,
                         say if no configuration file was found.

  `command_chain`          A |List| of |Dictionary| items defining a series
                         of commands to be run. At least one |Dictionary|
                         should be provided. Each Dictionary must contain the
                         key `callback`, defining a |String| or |Funcref| for
                         a function returning a |String| for a command to run.

                         The callback functions for each command after the
                         first command in in the chain should accept two
                         arguments `(buffer, output)`, a buffer number and a
                         |List| of lines of output from the previous command
                         in the chain.

                         The first callback function in a chain accepts only
                         a `(buffer)` argument, as there are no previous
                         commands to run which return `output`.

                         If an empty string is returned for a command in a
                         chain, that command in the chain will be skipped,
                         and the next function in the chain will be called
                         immediately instead. If the last command in a chain
                         returns an empty string, then no linting will be
                         performed.

                         Commands in the chain will all use the
                         `output_stream` value provided in the root
                         |Dictionary|. Each command in the chain can also
                         provide an `output_stream` key to override this value.
                         See the `output_stream` description for more
                         information.

                         Commands in the chain all behave as if `read_buffer`
                         is set to `0` by default, except for the last command
                         in the chain, which uses the value set for
                         `read_buffer` in the root |Dictionary|. Each command
                         in the chain can also provide a `read_buffer` key
                         to override these values.
                         See the `read_buffer` description for more
                         information.

  `output_stream`          A |String| for the output stream the lines of output
                         should be read from for the command which is run. The
                         accepted values are `'stdout'`, `'stderr'`, and
                         `'both'`. This argument defaults to `'stdout'`. This
                         argument can be set for linter programs which output
                         their errors and warnings to the stderr stream
                         instead of stdout. The option `'both'` will read
                         from both stder and stdout at the same time.

  `read_buffer`            A |Number| (`0` or `1`) indicating whether a command
                         should read the Vim buffer as input via stdin. This
                         option is set to `1` by default, and can be disabled
                         if a command manually reads from a temporary file
                         instead, etc.

  Only one of `command`, `command_callback`, or `command_chain` should be
  specified. `command_callback` is generally recommended when a command string
  needs to be generated dynamically, or any global options are used.
  `command_chain` is recommended where any system calls need to be made to
  retrieve some kind of information before running the final command.

  If temporary files or directories are created for commands run with
  `command_callback` or `command_chain`, then these tempoary files or
  directories can be managed by ALE, for automatic deletion.
  See |ale#engine#ManageFile()| and |ale#engine#ManageDirectory| for more
  information.

  All command strings will be formatted for special character sequences.
  Any substring `%s` will be replaced with the full path to the current file
  being edited. This format option can be used to pass the exact filename
  being edited to a program.

  For example: >
  'command': 'eslint -f unix --stdin --stdin-filename %s'
<
  Any substring `%t` will be replaced with a path to a temporary file. Merely
  adding `%t` will cause ALE to create a temporary file containing the
  contents of the the buffer being checked. All occurrences of `%t` in command
  strings will reference the one temporary file. The temporary file will be
  created inside a temporary directory, and the entire temporary directory
  will be automatically deleted, following the behaviour of
  |ale#engine#ManageDirectory|. This option can be used for some linters which
  do not support reading from stdin.

  For example: >
  'command': 'ghc -fno-code -v0 %t',
<
  The character sequence `%%` can be used to emit a literal `%` into a
  command, so literal character sequences `%s` and `%t` can be escaped by
  using `%%s` and `%%t` instead, etc.

  If a callback for a command generates part of a command string which might
  possibly contain `%%`, `%s`, or `%t` where the special formatting behaviour
  is not desired, the |ale#engine#EscapeCommandPart()| function can be used to
  replace those characters to avoid formatting issues.


ale#linter#Get(filetype)                                     *ale#linter#Get()*
  Return all of linters configured for a given filetype as a |List| of
  |Dictionary| values in the format specified by |ale#linter#Define()|.

  Filetypes may be dot-seperated to invoke linters for multiple filetypes:
  for instance, the filetype `javascript.jsx` will return linters for both the
  `javascript` and `jsx` filetype.

  Aliases may be defined in as described in |g:ale_linter_aliases|. Aliases
  are applied after dot-seperated filetypes are broken up into their
  components.


ale#statusline#Status()                               *ale#statusline#Status()*
  Return a formatted string that can be added to the statusline.
  The output's format is defined in |`g:ale_statusline_format`|.
  To enable it, the following should be present in your |statusline| settings: >
  %{ale#statusline#Status()}


ALELint                                                               *ALELint*
  This |User| autocommand is triggered by ALE every time it completes a lint
  operation. It can be used to update statuslines, send notifications, or
  complete any other operation that needs to be done after a lint run.
  It can be used simply:
  autocmd User ALELint echom "ALE run!"


===============================================================================
8. Special Thanks                                          *ale-special-thanks*

Special thanks to Mark Grealish (https://www.bhalash.com/) for providing ALE's
snazzy looking ale glass logo. Cheers, Mark!

===============================================================================
9. Contact                                                        *ale-contact*

If you like this plugin, and wish to get in touch, check out the GitHub
page for issues and more at https://github.com/w0rp/ale

If you wish to contact the author of this plugin directly, please feel
free to send an email to devw0rp@gmail.com.


Please drink responsibly, or not at all, which is ironically the preference
of w0rp, who is teetotal.



  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl: