Add new "govet" checker for static checking of Go code with the vet tool

syntax_checkers/go/govet.vim

@@ -0,0 +1,44 @@
+"============================================================================
+"File:        govet.vim
+"Description: Perform static analysis of Go code with the vet tool
+"Maintainer:  Kamil Kisiel <kamil@kamilkisiel.net>
+"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_go_govet_checker")
+    finish
+endif
+let g:loaded_syntastic_go_govet_checker=1
+
+function! SyntaxCheckers_go_govet_IsAvailable()
+    return executable('go')
+endfunction
+
+function! SyntaxCheckers_go_govet_GetLocList()
+    let makeprg = 'go vet'
+    let errorformat = '%f:%l: %m,%-G%.%#'
+
+    " The go tool needs to either be run with an import path as an
+    " argument or directly from the package directory. Since figuring out
+    " the poper import path is fickle, just pushd/popd to the package.
+    let popd = getcwd()
+    let pushd = expand('%:p:h')
+    "
+    " pushd
+    exec 'lcd ' . fnameescape(pushd)
+
+    let errors = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat, 'defaults': {'type': 'w'} })
+
+    " popd
+    exec 'lcd ' . fnameescape(popd)
+
+    return errors
+endfunction
+
+call g:SyntasticRegistry.CreateAndRegisterChecker({
+    \ 'filetype': 'go',
+    \ 'name': 'govet'})