*ale.txt* For Vim version 8.0. Last change: 2016 October 7 *ale* ALE - Asychronous 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. phpcs......................................|ale-linter-options-phpcs| 4.3. c-gcc......................................|ale-linter-options-c-gcc| 5. API............................................|ale-api| 6. 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. * Bash: 'shell' (-n flag), 'shellcheck' * Bourne Shell: 'shell' (-n flag), 'shellcheck' * C: 'gcc' * CoffeeScript: 'coffelint' * CSS: 'csslint' * D: 'dmd' * Fortran: 'gcc' * Haskell: 'ghc' * HTML: 'tidy' * JavaScript: 'eslint', 'jscs', 'jshint' * JSON: 'jsonlint' * PHP: 'php' (-l flag), 'phpcs' * Python: 'flake8' * Ruby: 'rubocop' * SASS: 'sasslint' * SCSS: 'sasslint', 'scsslint' * Scala: 'scalac' * TypeScript: 'tslint' * Vim: 'vint' * YAML: 'yamllint' =============================================================================== 3. Global Options *ale-options* g:ale_linters *g:ale_linters* Type: |Dictionary| Default: unset The |g:ale_linters| option sets a |Dictionary| mapping a filetype to a |List| of linter programs to be run when checking particular filetypes. By default, this dictionary will not be set at all, and all possible linter programs will be run for a given filetype, if the linter programs are found to be |executable|. 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': []} < 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. 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 |`ALEGetStatusLine()`| output. - The 1st element is for errors - The 2nd element is for warnings - The 3rd element is for when no erros are detected =============================================================================== 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'` This variable can be changed to change the path to eslint. If you have eslint_d installed, you can set this option to use eslint_d instead. ------------------------------------------------------------------------------- 4.2. 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. ------------------------------------------------------------------------------- 4.3. c-gcc *ale-linter-options-c-gcc* g:ale_c_gcc_options *g:ale_c_gcc_options* Type: |String| Default: `'-Wall'` This variable can be change to modify flags given to gcc. =============================================================================== 5. API *ale-api* ALELint(delay) *ALELint()* 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 ALEAddLinter(filetype, linter) *ALEAddLinter()* 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', < ALEGetLinters(filetype) *ALEGetLinters()* Return all of linters configured for a given filetype as a |List| of |Dictionary| values in the format specified by |ALEAddLinter()|. ALEGetStatusLine() *ALEGetStatusLine()* 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: > %{ALEGetStatusLine()} 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 |ALEAddLinter| for more. =============================================================================== 6. 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: