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ale.txt
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*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. jshint................................|ale-linter-options-jshint|
4.3. phpcs.................................|ale-linter-options-phpcs|
4.4. html-tidy.............................|ale-linter-options-html-tidy|
4.5. c-gcc.................................|ale-linter-options-c-gcc|
4.6. cpp-gcc...............................|ale-linter-options-cpp-gcc|
4.7. fortran-gcc...........................|ale-linter-options-fortran-gcc|
4.8. shell.................................|ale-linter-options-shell|
4.9. shellcheck............................|ale-linter-options-shellcheck|
4.10. vint..................................|ale-linter-options-vint|
4.11. luacheck..............................|ale-linter-options-luacheck|
4.12. c-cppcheck............................|ale-linter-options-c-cppcheck|
4.13. cpp-cppcheck..........................|ale-linter-options-cpp-cppcheck|
5. Commands/Keybinds..........................|ale-commands|
6. API........................................|ale-api|
7. Special Thanks.............................|ale-special-thanks|
8. 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'
* C++ (filetype cpp): 'cppcheck', 'gcc'
* CoffeeScript: 'coffee', 'coffelint'
* CSS: 'csslint'
* Cython (pyrex filetype): 'cython'
* D: 'dmd'
* Elixir: 'credo'
* Fortran: 'gcc'
* Go: 'gofmt -e', 'go vet', 'golint'
* Haskell: 'ghc', 'hlint'
* HTML: 'HTMLHint', 'tidy'
* JavaScript: 'eslint', 'jscs', 'jshint'
* JSON: 'jsonlint'
* Lua: 'luacheck'
* Markdown: 'mdl'
* MATLAB: 'mlint'
* Perl: 'perl' (-c flag), 'perlcritic'
* PHP: 'php' (-l flag), 'phpcs'
* Pug: 'pug-lint'
* Python: 'flake8'
* Ruby: 'rubocop'
* SASS: 'sasslint'
* SCSS: 'sasslint', 'scsslint'
* Scala: 'scalac'
* TypeScript: 'tslint'
* Verilog: 'iverilog', 'verilator'
* Vim: 'vint'
* YAML: 'yamllint'
===============================================================================
3. Global Options *ale-options*
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_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_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_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_set_loclist *g:ale_set_loclist*
Type: |Number|
Default: `1`
When this option is set to `1`, the |loclist| will be populate 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_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_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_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_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_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_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_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_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.
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: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|.
===============================================================================
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_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. 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.
-------------------------------------------------------------------------------
4.3. 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.
-------------------------------------------------------------------------------
4.4. 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
-------------------------------------------------------------------------------
4.5. 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.
-------------------------------------------------------------------------------
4.6. 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.
-------------------------------------------------------------------------------
4.7. 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.
-------------------------------------------------------------------------------
4.8. 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.
-------------------------------------------------------------------------------
4.9. 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).
-------------------------------------------------------------------------------
4.10. 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.
-------------------------------------------------------------------------------
4.11. 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.
-------------------------------------------------------------------------------
4.12. 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.
-------------------------------------------------------------------------------
4.13. 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.
===============================================================================
5. 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)
<
===============================================================================
6. 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#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#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`.
Either this or the `command_callback` argument must
be provided.
`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.
`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.
Some programs for checking for errors are not capable of receiving input
from stdin, as is required by ALE. To remedy this, a wrapper script is
provided named in the variable |g:ale#util#stdin_wrapper|. This variable
can be called with the regular arguments for any command to forward data
from stdin to the program, by way of creating a temporary file. The first
argument to the stdin wrapper must be a file extension to save the temporary
file with, and the following arguments are the command as normal.
For example: >
'command': g:ale#util#stdin_wrapper . ' .hs ghc -fno-code -v0',
<
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()}
g:ale#util#stdin_wrapper *g:ale#util#stdin_wrapper*
This variable names a wrapper script for sending stdin input to programs
which cannot accept input via stdin. See |ale#linter#Define()| for more.
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!"
===============================================================================
7. 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!
===============================================================================
8. 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: