syntastic/syntax_checkers/haskell/ghc-mod.vim

"============================================================================
"File:        ghc-mod.vim
"Description: Syntax checking plugin for syntastic.vim
"Maintainer:  Anthony Carapetis <anthony.carapetis at gmail dot com>
"License:     This program is free software. It comes without any warranty,
"             to the extent permitted by applicable law. You can redistribute
"             it and/or modify it under the terms of the Do What The Fuck You
"             Want To Public License, Version 2, as published by Sam Hocevar.
"             See http://sam.zoy.org/wtfpl/COPYING for more details.
"
"============================================================================

if exists("g:loaded_syntastic_haskell_ghc_mod_checker")
    finish
endif
let g:loaded_syntastic_haskell_ghc_mod_checker=1

if !exists('g:syntastic_haskell_checker_args')
    let g:syntastic_haskell_checker_args = '--hlintOpt="--language=XmlSyntax"'
endif

function! SyntaxCheckers_haskell_ghc_mod_IsAvailable()
    return executable('ghc-mod')
endfunction

function! SyntaxCheckers_haskell_ghc_mod_GetLocList()
    let ghcmod = 'ghc-mod ' . g:syntastic_haskell_checker_args
    let makeprg =
          \ "{ ".
          \ ghcmod . " check ". shellescape(expand('%')) . "; " .
          \ ghcmod . " lint " . shellescape(expand('%')) . ";" .
          \ " }"
    let errorformat = '%-G\\s%#,%f:%l:%c:%trror: %m,%f:%l:%c:%tarning: %m,'.
                \ '%f:%l:%c: %trror: %m,%f:%l:%c: %tarning: %m,%f:%l:%c:%m,'.
                \ '%E%f:%l:%c:,%Z%m,'

    return SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat })
endfunction

call g:SyntasticRegistry.CreateAndRegisterChecker({
    \ 'filetype': 'haskell',
    \ 'name': 'ghc_mod'})