Add hadolint support

syntax_checkers/dockerfile/hadolint.vim

@@ -0,0 +1,43 @@
+"============================================================================
+"File:        hadolint.vim
+"Description: Dockerfile linter written in Haskell
+"             (http://hadolint.lukasmartinelli.ch/).
+"Maintainer:  Jesper B. Rosenkilde <jbr at humppa dot dk>
+"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_dockerfile_hadolint_checker')
+    finish
+endif
+let g:loaded_syntastic_dockerfile_hadolint_checker = 1
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+function! SyntaxCheckers_dockerfile_hadolint_GetLocList() dict
+    let makeprg = self.makeprgBuild({ 'exe': 'hadolint' })
+
+    let errorformat = '%W%f:%l %m'
+
+    let loclist = SyntasticMake({
+        \ 'makeprg': makeprg,
+        \ 'errorformat': errorformat,
+        \ 'subtype': 'Style',
+        \ 'returns': [0, 1] })
+
+    return loclist
+endfunction
+
+call g:SyntasticRegistry.CreateAndRegisterChecker({
+    \ 'filetype': 'dockerfile',
+    \ 'name': 'hadolint'})
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim: set sw=4 sts=4 et fdm=marker: