Use syntastic instead of pyflakes (supports a ton of more languages)

sources_non_forked/syntastic/syntax_checkers/lua/luac.vim

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+"============================================================================
+"File:        lua.vim
+"Description: Syntax checking plugin for syntastic.vim
+"Maintainer:  Gregor Uhlenheuer <kongo2002 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_lua_luac_checker")
+    finish
+endif
+let g:loaded_syntastic_lua_luac_checker = 1
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+function! SyntaxCheckers_lua_luac_GetHighlightRegex(pos)
+    let result = ''
+    let near = matchstr(a:pos['text'], '\mnear ''\zs[^'']\+\ze''')
+    if near != ''
+        if near ==# '<eof>'
+            let p = getpos('$')
+            let a:pos['lnum'] = p[1]
+            let a:pos['col'] = p[2]
+            let result = '\%' . p[2] . 'c'
+        else
+            let result = '\V' . near
+        endif
+
+        " XXX the following piece of code is evil, and is likely to break
+        " in future versions of syntastic; enable it at your own risk :)
+
+        "let open = matchstr(a:pos['text'], '\m(to close ''\zs[^'']\+\ze'' at line [0-9]\+)')
+        "if open != ''
+        "    let line = str2nr(matchstr(a:pos['text'], '\m(to close ''[^'']\+'' at line \zs[0-9]\+\ze)'))
+        "    let group = a:pos['type'] ==? 'E' ? 'SyntasticError' : 'SyntasticWarning'
+        "    call matchadd(group, '\%' . line . 'l\V' . open)
+        "endif
+    endif
+    return result
+endfunction
+
+function! SyntaxCheckers_lua_luac_GetLocList() dict
+    let makeprg = self.makeprgBuild({ 'args_after': '-p' })
+
+    let errorformat =  'luac: %#%f:%l: %m'
+
+    return SyntasticMake({
+        \ 'makeprg': makeprg,
+        \ 'errorformat': errorformat,
+        \ 'defaults': { 'bufnr': bufnr(''), 'type': 'E' } })
+endfunction
+
+call g:SyntasticRegistry.CreateAndRegisterChecker({
+    \ 'filetype': 'lua',
+    \ 'name': 'luac'})
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim: set et sts=4 sw=4: