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The checksyntax plugin runs an external syntax checker for the current buffer 
whenever the buffer is saved (by calling the |:CheckSyntax| command). Syntax 
errors are managed as location or quickfix lists. If any syntax error occurs, 
the |location-list| is opened (users can redefine |CheckSyntaxFail()| to change 
this behaviour). You can use any |location-list| related command to navigate 
the list of syntax errors.

Most syntax checks can be run asynchronously (from Vim 8 onwards or, for 
Vim 7, if the AsyncCommand plugin is installed).


Invocation~

Manual invocation:
By default, |:CheckSyntax| is mapped to <F5> (if not mapped already), and 
automatically executed when saving the buffer. If multiple syntax checkers are 
defined for the given filetype, this will by default invoke the preferred (see 
|g:checksyntax#preferred|) or first good (i.e. installed) syntax checker for a 
given filetype.

:CheckSyntax! (with the optional <bang>) or <C-F5> will run all supported 
syntax checkers for a given filetype if multiple syntax checkers are defined 
for a given filetype and if the software is installed on your computer.

Automatic invocation:
In order to automatically run a syntax check when saving a file, please set 
|g:checksyntax#auto_filetypes| or |g:checksyntax#auto_enable_rx| to an 
appropriate value. If |g:checksyntax#auto_enable_rx| is set to '.', which 
matches all filetypes, automatic syntax checks are enabled for all supported 
filetypes. Automatic checks are equivalent to running |:CheckSyntax| with no 
<bang>.


Supported filetypes~

The syntax checks are performed by external syntax checker. This software has 
to be installed on your computer. Pre-defined syntax checkers are:

  bash         ... shellcheck, bash -n
  c, cpp       ... splint
  haskell      ... hlint, ghc-mod-check
  html         ... tidy
  java         ... jlint, checkstyle, pmd
  javascript   ... jshint, esprima, gjslint, jslint, jsl, pmd
  lua          ... luac (run luac -p)
  perl         ... perl (run perl -Wc)
  php          ... php (run php -l)
  python       ... pyflakes or pylint
  r            ... lintr
  ruby         ... ruby (run ruby -c)
  tex, latex   ... chktex (run chktex -q -v0)
  typescript   ... tsc
  viki         ... deplate
  vim          ... vint
  xhtml        ... tidy
  xml, docbk   ... xmllint, pmd

Checkers with support for many filetypes:

  coala        ... c, cpp, csharp, cmake, coffeescript, css, dart, fortran, go, 
                   haskell, html, java, javascript, jsp, tex, lua, markdown, 
                   perl, php, python, r, rst, ruby, scala, scss, sh, sql, 
                   swift, typescript, verilog, vhdl, vim, xml, yaml and maybe 
                   others

Syntax checker definitions are kept in:
autoload/checksyntax/defs/{&filetype}.vim

Run this command to find out, which filetypes are supported: >

  :echo globpath(&rtp, 'autoload/checksyntax/defs/*.vim')


Trouble shooting~

It's possible that a newer version of a linter changes its command-line 
arguments or the output format in a way that breaks the checksyntax plugin. 
Since I personally use only a small subset of the provided checkers, it's 
likely that I won't notice the problem. If the checksyntax plugin doesn't seem 
to work, please proceed as follows:

1. Check if the errorformat is correctly defined. Look at either:
    - `autoload/checksyntax/defs/LINTER.vim` or
    - `compiler/checksyntax/LINTER.vim`.
   If the linter is defined as a compiler, you can try to invoke the compiler 
   manually: >
     compiler checksyntax/LINTER
     lmake

2. Use `:let g:checksyntax#debug = 2` to get a high level view of what is going 
   on when you invoke |:CheckSyntax|.

3. Install the tlib plugin (vimscript #1863 or 
   https://github.com/tomtom/tlib_vim) and try: >
     :Tlibtraceset --file=checksyntax.log +checksyntax
<   Invoke |:CheckSyntax| and send me the resulting log file per e-mail. You 
   can use `:CheckSyntax FILETYPE LINTER` to invoke a specific syntax checker.


-----------------------------------------------------------------------
Install~

Edit the vba file and type: >

    :so %

See :help vimball for details. If you have difficulties or use vim 7.0, 
please make sure, you have the current version of vimball (vimscript 
#1502) installed or update your runtime.

Also available via git: http://github.com/tomtom/checksyntax_vim/


Optional enhancements~

If the quickfixsigns plugin (vimscript #2584) is installed, lines containing 
syntax errors will be marked with signs.

The tinykeymap plugin (vimscript #4199) can be used to quickly move from one 
issue to the next by using it's quickfix or location-list maps (see 
|g:tinykeymap#map#qfl#map| and |g:tinykeymap#map#loc#map|).

For vim8+: Checks will be run asynchronously by default.

For vim7: If AsyncCommand (vimscript #3431) is installed, syntax checks can 
be peformed asynchronously -- see also |g:checksyntax#run_alternatives|, 
|g:checksyntax#run_all_alternatives| and |g:checksyntax#async_runner|. This 
requires a version of vim with |clientserver| support and |v:servername| to be 
set (for vim see also |--servername|).





License: GPLv3 or later
Install: See http://github.com/tomtom/vimtlib/blob/master/INSTALL.TXT
See http://github.com/tomtom for related plugins.

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