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vim-langtool : list and jump to grammar errors found by LanguageTool

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created by
Enno Nagel
script type
This Vim plug-in collects all grammar mistakes (of the currently open file)
found by LanguageTool (https://languagetool.org) into the quickfix (or local)
list from which they can be jumped to.


If you already have LanguageTool installed and start it in the command line by
an executable, say /usr/bin/langtool, then add to your vimrc the line

  let g:langtool_cmd = '/usr/bin/langtool'

Otherwise, download and unpack LanguageTool from
https://languagetool.org/download/, say into the folder ~/LanguageTool, and add
to your vimrc the line

  let g:langtool_jar = '~/LanguageTool/languagetool-commandline.jar'

where the right-hand side, ~/LanguageTool/languagetool-commandline.jar, is the
path of the file languagetool-commandline.jar.


The command


populates the location-list with all grammar mistakes found by LanguageTool.
The (location-list) window that lists them can then be opened by :lwindow and
they can be jumped to by :lN respectively :lp. (Have a look at vim-unimpaired
    to use convenient mappings instead).

LanguageTool runs in the background by Vim's job feature, provided a custom
:Make command exists, such as

- that of vim-dispatch, or
- with AsyncRun.vim installed (see also Hints below), that defined by

    command! -bang -nargs=* -complete=file Make AsyncRun<bang> -auto=make -program=make

The (quickfix) window that lists the grammar mistakes can then be opened by
:cwindow and they can be jumped to by :cN respectively :cp.

To automatically open the location-list window after LangTool, add autocmd
QuickFixCmdPost lmake lwindow to your vimrc, respectively autocmd
QuickFixCmdPost make cwindow if the :Make command exists. To automatically run
LangTool after saving the modifications to a text, mail or markdown file, add
to your vimrc:

    autocmd FileType text,mail,markdown autocmd BufWrite <buffer=abuf> LangTool


Command-line parameters can be passed to LanguageTool by the global variable
g:langtool_parameters and the buffer-local variable b:langtool_parameters. By

let g:langtool_parameters = ''


let b:langtool_parameters = '--autoDetect'

For example, the mother tongue can be set and (categories of) rules enabled and
disabled by adding to your vimrc

  let s:enablecategories = 'CREATIVE_WRITING,WIKIPEDIA' .

  let g:langtool_parameters = ' --mothertongue de' .
        \ ' --enablecategories ' . s:enablecategories .
        \ ' --enable ' . s:enable .
        \ ' --disable ' . s:disable

:LangTool sets the language that LanguageTool will use to that used by Vim to
spellcheck by

  let b:langtool_parameters = '--language ' . &l:spelllang

To avoid that the file is saved before LanguageTool checks it for mistakes,

  let g:langtool_save = 0


If you use AsyncRun.vim, add let g:asyncrun_trim = 1 to your vimrc to avoid
empty lines in the quickfix list. Other options, such as g:asyncrun_save might
be of interest.


This Vim plug-in is simpler than vim-LanguageTool and vim-grammarous. In
particular, it lets Vim parse the LanguageTool output to stdout via an
appropriate value of &errorformat; see :help errorformat. (Whereas both
plug-ins implement their proper parser for the deprecated XML output format
of LanguageTool.)


vim-langtool is developed at https://github.com/Konfekt/vim-langtool where issues can be filed.

install details
Unzip vim-langtool.zip into  ~/.vim on Linux and MacOS, or into %USERPROFILE%\vimfiles on Windows.

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Click on the package to download.

package script version date Vim version user release notes
vim-langtool.zip 1.2 2020-04-06 7.0 Enno Nagel round up some rough edges
vim-langtool.zip 1.1 2020-01-12 7.0 Enno Nagel propose to save buffer to file if need be and show autodetected language
vim-langtool.zip 1.0 2020-01-08 7.0 Enno Nagel Initial upload
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