first try on shell syntax checker

syntax_checkers/sh.vim

@@ -0,0 +1,31 @@
+"============================================================================
+"File:        sh.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("loaded_sh_syntax_checker")
+    finish
+endif
+let loaded_sh_syntax_checker = 1
+
+" bail if there is no proper shell (bash, zsh) to execute
+if !executable(&shell)
+    finish
+endif
+
+function! SyntaxCheckers_sh_GetLocList()
+    let output = system(&shell . " -n " . expand("%"))
+    if v:shell_error != 0
+        " bash/zsh only output the first error, so parse it ourselves
+        let line = substitute(output, '^[^:]*:\(\d*\):.*', '\1', '')
+        let msg = substitute(output, '^[^:]*:\d*: \(.*\)', '\1', '')
+        return [{'lnum' : line, 'text' : msg, 'bufnr': bufnr(""), 'type': 'E' }]
+    endif
+    return []
+endfunction