add simple vim syntax file

contrib/README

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+This directory is for additional contributed files which may be useful.
+
+vim
+
+	Syntax highlighting of gmid configuration for vim, to be
+	placed into ~/.vim/ or /usr/share/vim/vimfiles.

contrib/vim/ftdetect/gmid.vim

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+" Vim filetype detection file
+" Language: gmid(1) configuration files
+" Licence: ISC
+
+au BufNewFile,BufRead *.gmid       set filetype=gmid
+au BufNewFile,BufRead */etc/gmid/* set filetype=gmid
+au BufNewFile,BufRead gmid.conf    set filetype=gmid

contrib/vim/ftplugin/gmid.vim

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+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+let b:undo_ftplugin = "setl cms< sua<"
+
+setlocal suffixesadd+=.conf,.gmid
+
+" vim-commentary support
+setlocal commentstring=#\ %s

contrib/vim/indent/gmid.vim

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+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=
+
+" cindent actually works for simple file structure
+setlocal cindent
+" Just make sure that the comments are not reset as defs would be.
+setlocal cinkeys-=0#

contrib/vim/syntax/gmid.vim

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+" Vim syntax file
+" Language: gmid(1) configuration files
+" Licence: ISC
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Syntax Definition: {{{1
+" ==================
+syn case match
+setlocal iskeyword+=-
+
+" Value Types: {{{2
+" ============
+syn keyword gmidBoolean on
+syn keyword gmidBoolean off
+
+syn match   gmidNumber "\<\d\+\>" display
+
+syn region  gmidQuotedString start=+"+ end=+"+ skip=+\\"+
+syn region  gmidQuotedString start=+'+ end=+'+ skip=+\\'+
+
+syn match   gmidVariable "\$\w\w*" display
+syn match   gmidMacro    "@\w\w*" display
+
+" Errors: {{{2
+" ============
+" TODO: write comprehensive syntax rules so it can be checked with:
+" syn match gmidError '.'
+syn keyword gmidDirectiveDeprecated mime
+
+" Comments: {{{2
+" =========
+syn match gmidComment "\s*#.*$" display
+
+" Global Options: {{{2
+" ===============
+syn keyword gmidDirective chroot
+syn keyword gmidDirective include
+syn keyword gmidDirective ipv6      nextgroup=gmidBoolean skipwhite
+syn keyword gmidDirective map
+syn keyword gmidDirectiveContinuation to-ext
+syn keyword gmidDirective port      nextgroup=gmidNumber  skipwhite
+syn keyword gmidDirective prefork   nextgroup=gmidNumber  skipwhite
+syn keyword gmidDirective protocols
+syn keyword gmidDirective user
+
+" Server Blocks: {{{2
+" ==============
+syn region gmidBlock start="{" end="}" fold transparent
+
+syn keyword gmidDirectiveBlock server
+syn keyword gmidDirectiveBlock location
+
+syn keyword gmidDirective alias
+syn match   gmidDirective "\<auto\s\+index\>" nextgroup=gmidBoolean skipwhite display
+syn keyword gmidDirective block
+syn keyword gmidDirectiveContinuation return nextgroup=gmidNumber skipwhite
+syn keyword gmidDirective cert
+syn keyword gmidDirective cgi
+syn match   gmidDirective "\<default\s\+type>" display
+syn keyword gmidDirective entrypoint
+syn keyword gmidDirective fastcgi
+syn keyword gmidDirectiveContinuation tcp
+syn keyword gmidDirective index
+syn keyword gmidDirective key
+syn keyword gmidDirective lang
+syn keyword gmidDirective log nextgroup=gmidBoolean skipwhite
+syn keyword gmidDirective param
+syn keyword gmidDirective root
+syn match   gmidDirective "\<require\s\+client\s\+ca>" display
+syn keyword gmidDirective strip nextgroup=gmidNumber skipwhite
+
+" Highlighting Settings: {{{1
+" ======================
+
+hi def link gmidComment               Comment
+
+hi def link gmidBoolean               Boolean
+hi def link gmidNumber                Number
+hi def link gmidQuotedString          String
+
+hi def link gmidVariable              Identifier
+hi def link gmidMacro                 Macro
+
+hi def link gmidDirective             Keyword
+hi def link gmidDirectiveBlock        Function
+hi def link gmidDirectiveContinuation Type
+hi def link gmidDirectiveDeprecated   Error
+
+let b:current_syntax = "gmid"