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

sources_non_forked/syntastic/syntax_checkers/handlebars/handlebars.vim

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+"============================================================================
+"File:        handlebars.vim
+"Description: Syntax checking plugin for syntastic.vim
+"Maintainer:  Martin Grenfell <martin.grenfell 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_handlebars_handlebars_checker")
+    finish
+endif
+let g:loaded_syntastic_handlebars_handlebars_checker = 1
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+function! SyntaxCheckers_handlebars_handlebars_GetLocList() dict
+    let makeprg = self.makeprgBuild({ 'args_after': '-f ' . syntastic#util#DevNull() })
+
+    let errorformat =
+        \ '%EError: %m on line %l:,'.
+        \ "%EError: %m,".
+        \ '%Z%p^,' .
+        \ '%-G%.%#'
+
+    return SyntasticMake({
+        \ 'makeprg': makeprg,
+        \ 'errorformat': errorformat,
+        \ 'defaults': {'bufnr': bufnr("")} })
+endfunction
+
+call g:SyntasticRegistry.CreateAndRegisterChecker({
+    \ 'filetype': 'handlebars',
+    \ 'name': 'handlebars'})
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim: set et sts=4 sw=4: