"============================================================================
"File:        vala.vim
"Description: Syntax checking plugin for syntastic.vim
"Maintainer:  Konstantin Stepanov (me@kstep.me)
"Notes:       Add special comment line into your vala file starting with
"             "// modules: " and containing space delimited list of vala
"             modules, used by the file, so this script can build correct
"             --pkg arguments.
"             Alternatively you can set g:syntastic_vala_modules array
"             in your .vimrc or .lvimrc with localvimrc plugin
"             (http://www.vim.org/scripts/script.php?script_id=441).
"             Valac compiler is not the fastest thing in the world, so you
"             may want to disable this plugin with
"             let g:syntastic_vala_check_disabled = 1 command in your .vimrc or
"             command line. Unlet this variable to set it to 0 to reenable
"             this checker.
"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 !executable('valac')
    finish
endif

if exists('g:syntastic_vala_check_disabled') && g:syntastic_vala_check_disabled
    finish
endif

function! SyntaxCheckers_vala_GetHighlightRegex(pos)
    let strlength = strlen(matchstr(a:pos['text'], '\^\+$'))
    return '\%>'.(a:pos.col-1).'c.*\%<'.(a:pos.col+strlength+1).'c'
endfunction

function! s:GetValaModules()
    if exists('g:syntastic_vala_modules')
        if type(g:syntastic_vala_modules) == type('')
            return split(g:syntastic_vala_modules, '\s\+')
        elseif type(g:syntastic_vala_modules) == type([])
            return g:syntastic_vala_modules
        else
            echoerr 'g:syntastic_vala_modules must be either list or string: fallback to in file modules string'
        endif
    endif

    let modules_line = search('^// modules: ', 'n')
    let modules_str = getline(modules_line)
    return split(strpart(modules_str, 12), '\s\+')
endfunction

function! SyntaxCheckers_vala_GetLocList()
    let vala_pkg_args = join(map(s:GetValaModules(), '"--pkg ".v:val'), ' ')
    let makeprg = syntastic#makeprg#build({
                \ 'exe': 'valac',
                \ 'args': '-C ' . vala_pkg_args })
    let errorformat = '%A%f:%l.%c-%\d%\+.%\d%\+: %t%[a-z]%\+: %m,%C%m,%Z%m'

    return SyntasticMake({ 'makeprg': makeprg,
                         \ 'errorformat': errorformat,
                         \ 'defaults': {'force_highlight_callback': 1} })
endfunction