A powerful grammar checker for Vim using LanguageTool.
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README.md

vim-grammarous

vim-grammarous is a powerful grammar checker for Vim. Simply do :GrammarousCheck to see the powerful checking. This plugin automatically downloads LanguageTool, which requires Java 8+.

This plugin can use job feature on Vim 8.0.27 (or later) or Neovim. It enables asynchronous command execution so you don't need to be blocked until the check has been done on Vim8+ or Neovim.

demo screen cast

Commands

:[range]GrammarousCheck [--lang={lang}] [--(no-)preview] [--(no-)comments-only]

Execute the grammar checker for current buffer (when [range] is specified, the target is a text in the range).

  1. It makes LanguageTool check grammar (It takes a while)
  2. It highlights the locations of detected grammar errors
  3. When you move the cursor to a location of an error, it automatically shows the error with the information window (named [Grammarous]).

Please do :GrammarousCheck --help to show more detail about the command.

:GrammarousReset

Reset the current check.

Mappings

Local mappings in the information window

You can use some mappings in the information window, which is opened to show the detail of an error when the cursor moves to the error.

Mappings Description
q Quit the info window
<CR> Move to the location of the error
f Fix the error automatically
r Remove the error without fix
R Disable the grammar rule in the checked buffer
n Move to the next error's location
p Move to the previous error's location
? Show help of the mapping in info window

<Plug> mappings to execute actions anywhere

The above local mappings are enough to deal with grammar errors.

However, for a more convenient use, vim-grammarous provides the following global mappings to enable using all grammarous actions globally within vim. This might be beneficial, as the standard mappings only work within the info window, which loses focus after every action.

By mapping the actions listed below to your favorite shortcuts, it is possible to map all actions that work within the info window, to work globally within vim. This is done via :nmap and an example for a mapping would be :nmap <F5> (grammarous-move-to-next-error).

Mappings Description
<Plug>(grammarous-move-to-info-window) Move the cursor to the info window
<Plug>(grammarous-open-info-window) Open the info window for the error under the cursor
<Plug>(grammarous-reset) Reset the current check
<Plug>(grammarous-fixit) Fix the error under the cursor automatically
<Plug>(grammarous-fixall) Fix all the errors in a current buffer automatically
<Plug>(grammarous-close-info-window) Close the information window from checked buffer
<Plug>(grammarous-remove-error) Remove the error under the cursor
<Plug>(grammarous-disable-rule) Disable the grammar rule under the cursor
<Plug>(grammarous-move-to-next-error) Move cursor to the next error
<Plug>(grammarous-move-to-previous-error) Move cursor to the previous error

Operator mappings

Operator mapping checks grammatical errors in the extent which the text object specifies. This mapping is available when vim-operator-user is installed.

Mappings Description
<Plug>(operator-grammarous) Execute grammar check to a text object

grammarous unite.vim source

If you are unite.vim user, grammarous unite source is available to look and search the error list incrementally. To the candidates of the list, you can do the actions which are the same as ones in the info window. (fixit, remove error and disable rule) Execute below command in the buffer already checked or you want to check.

:Unite grammarous

grammarous denite.nvim source

For denite.nvim users, grammarous denite source is available. Note that the kind is currently set to file, which means that actions a user can use are limited to open(jump), preview, etc. Execute below command in the buffer already checked.

:Denite grammarous

Fix examples

FAQ

How do I check comments only in source code by default?

Please use g:grammarous#default_comments_only_filetypes.

For example, below setting makes grammar checker check comments only except for markdown and vim help.

let g:grammarous#default_comments_only_filetypes = {
            \ '*' : 1, 'help' : 0, 'markdown' : 0,
            \ }

How are rules added to the default rule set?

Please use g:grammarous#enabled_rules to enable additional rules. The value is dictionary whose keys are a filetype (* means 'any') and whose values are a list of rule names.

For example, below setting enables PASSIVE_VOICE rule in all filetypes.

let g:grammarous#enabled_rules = {'*' : ['PASSIVE_VOICE']}

Some rules annoy me.

Please use g:grammarous#disabled_rules to disable specific rules.

For example, below setting disables some rules for each filetype. * means all filetypes, help means vim help.

let g:grammarous#disabled_rules = {
            \ '*' : ['WHITESPACE_RULE', 'EN_QUOTES'],
            \ 'help' : ['WHITESPACE_RULE', 'EN_QUOTES', 'SENTENCE_WHITESPACE', 'UPPERCASE_SENTENCE_START'],
            \ }

The rule names are displayed in Vim command line when you disable the rule in the info window or by <Plug>(grammarous-disable-rule).

How are categories added to the default rule set?

Please use g:grammarous#enabled_categories to enable additional categories. The value is dictionary whose keys are a filetype (* means 'any') and whose values are a list of categories names.

For example, below setting enables PASSIVE_VOICE rule in all filetypes.

let g:grammarous#enabled_categories = {'*' : ['PUNCTUATION']}

Some categories annoy me.

Please use g:grammarous#disabled_categories to disable specific categories.

For example, below setting disables some categories for each filetype. * means all filetypes, help means vim help.

let g:grammarous#disabled_categories = {
            \ '*' : ['PUNCTUATION'],
            \ 'help' : ['PUNCTUATION', 'TYPOGRAPHY'],
            \ }

The category names are displayed in Vim command line when you disable the category in the info window or by <Plug>(grammarous-disable-category).

How do I use this plugin with vim's spelllang?

Plese use g:grammarous#use_vim_spelllang. Default 0, to enable 1.

I want to use above <Plug> mappings only after checking.

on_check and on_reset are available.

For example, below setting defines <C-n> and <C-p> mappings as buffer-local mappings when the check has been completed. They are cleared when the check is reset.

let g:grammarous#hooks = {}
function! g:grammarous#hooks.on_check(errs) abort
    nmap <buffer><C-n> <Plug>(grammarous-move-to-next-error)
    nmap <buffer><C-p> <Plug>(grammarous-move-to-previous-error)
endfunction

function! g:grammarous#hooks.on_reset(errs) abort
    nunmap <buffer><C-n>
    nunmap <buffer><C-p>
endfunction

I want to use system global LanguageTool command

g:grammarous#languagetool_cmd is available for the purpose. If some command is set to g:grammarous#languagetool_cmd in your .vimrc, vim-grammarous does not install its own LanguageTool jar and use the command to run LanguageTool.

let g:grammarous#languagetool_cmd = 'languagetool'

I want to see the first error in an information window soon after :GrammarousCheck

Please set g:grammarous#show_first_error to 1. It opens an information window after :GrammarousCheck immediately when some error detected.

I want to use a location list to jump among errors

Please set g:grammarous#use_location_list to 1. It sets all grammatical errors to location list. This variable is set to 0 by default to avoid conflicts of location list usage with other plugins.

Automatic installation

This plugin attempts to install LanguageTool using curl or wget command at first time. If it fails, you should install it manually. Please download zip file of LanguageTool and extract it to path/to/vim-grammarous/misc.

Requirements

Future

  • Ignore specific regions : Enable to specify the region which vim-grammarous should not check. It is helpful for GFM's fenced code blocks.
  • Incremental grammarous check : Check only the sentences you input while starting from entering and leaving insert mode.

Contribution

If you find some bugs, please report it to issues page. Pull requests are welcome. None of them is too short.

License

Copyright (c) 2014 rhysd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
THE USE OR OTHER DEALINGS IN THE SOFTWARE.