syntastic/syntax_checkers/haskell.vim

"============================================================================
"File:        haskell.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("loaded_haskell_syntax_checker")
    finish
endif
let loaded_haskell_syntax_checker = 1

"bail if the user doesnt have ghc-mod installed
if !executable("ghc-mod")
    finish
endif

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

function! SyntaxCheckers_haskell_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

function! SyntaxCheckers_lhaskell_GetLocList()
    return SyntaxCheckers_haskell_GetLocList()
endfunction