Added CSS syntax checking support using CSS Lint.

syntax_checkers/css.vim

@@ -0,0 +1,28 @@
+"============================================================================
+"File:        css.vim
+"Description: Syntax checking plugin for syntastic.vim using `csslint` CLI tool (http://csslint.net).
+"Maintainer:  Ory Band <oryband 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_css_syntax_checker")
+    finish
+endif
+let loaded_css_syntax_checker = 1
+
+" Bail if the user doesn't have `csslint` installed.
+if !executable("csslint")
+    finish
+endif
+
+function! SyntaxCheckers_css_GetLocList()
+    let makeprg = 'csslint '.shellescape(expand('%'))
+
+    " Print CSS Lint's 'Welcome' and error messages. Ignores the code line.
+    let errorformat  = '%+Gcsslint:\ There%.%#,%A%f:,%C%n:\ %t%\\w%\\+\ at\ line %l\,\ col\ %c,%Z%m,%A%f:,%C%n:\ %t%\\w%\\+\ at\ line %l\,\ col\ %c,%C%m,%-Z%.%#,%-G%.%#'
+
+    return SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat })
+endfunction