contrib/vim: add Syntastic integration

Error and warning messages are prefixed with "error: " and "warning: "
correspondingly to ease integration with automated tooling.

`yywarn' function added. Off-by-one line numbers in warnings are fixed.

Two error messages are reworded to avoid repeating like
"error: error in server directive" or "error: syntax error".

2 files changed, 41 insertions, 1 deletions

diff --git a/contrib/README b/contrib/README
index c57932c..ab45f9b 100644
--- a/contrib/README
+++ b/contrib/README
@@ -16,4 +16,8 @@ gmid.service
 vim
 
 	Syntax highlighting of gmid configuration for vim, to be
-	placed into ~/.vim/ or /usr/share/vim/vimfiles.
+	placed into ~/.vim/ or /usr/share/vim/vimfiles/.
+
+	To enable Syntastic checker, put this line in your vimrc:
+
+	let g:syntastic_gmid_checkers = ['gmid']
diff --git a/contrib/vim/syntax_checkers/gmid/gmid.vim b/contrib/vim/syntax_checkers/gmid/gmid.vim
new file mode 100644
index 0000000..d3187ee
--- /dev/null
+++ b/contrib/vim/syntax_checkers/gmid/gmid.vim
@@ -0,0 +1,36 @@
+" Syntax checking plugin for syntastic
+" Language: gmid(1) configuration file
+" Licence: ISC
+
+if exists('g:loaded_syntastic_gmid_gmid_checker')
+    finish
+endif
+let g:loaded_syntastic_gmid_gmid_checker = 1
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+function! SyntaxCheckers_gmid_gmid_GetLocList() dict
+    let makeprg = self.makeprgBuild({ 'args': '-nc' })
+
+    let errorformat =
+        \ '%-Gconfig OK,' .
+        \ '%f:%l %tarning: %m,' .
+        \ '%f:%l %trror: %m'
+
+    return SyntasticMake({
+        \ 'makeprg': makeprg,
+        \ 'errorformat': errorformat,
+        \ 'defaults': {'type': 'E'},
+        \ 'returns': [0, 1] })
+endfunction
+
+call g:SyntasticRegistry.CreateAndRegisterChecker({
+    \ 'filetype': 'gmid',
+    \ 'name': 'gmid',
+    \ 'exec': 'gmid'})
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim: set sw=4 sts=4 et fdm=marker: