" Vim syntax file
" Language:		configure.in script: M4 with sh
" Maintainer:	Christian Hammesr <ch@lathspell.westend.com>
" Last Change:	2015 Jan 14
" 				(patch from Yngve Inntjore Levinsen to detect AC_MSG)
" 				(patch from Khym Chanur to add @Spell)

" Well, I actually even do not know much about m4. This explains why there
" is probably very much missing here, yet !
" But I missed good highlighting when editing my GNU autoconf/automake
" script, so I wrote this quick and dirty patch.


" quit when a syntax file was already loaded
if exists("b:current_syntax")
  finish
endif

" define the config syntax
syn match   configdelimiter "[()\[\];,]"
syn match   configoperator  "[=|&\*\+\<\>]"
syn match   configcomment   "\(dnl.*\)\|\(#.*\)" contains=configDnl,@Spell
syn match   configfunction  "\<[A-Z_][A-Z0-9_]*\>"
syn match   confignumber    "[-+]\=\<\d\+\(\.\d*\)\=\>"
syn keyword configDnl   	dnl contained
syn keyword configkeyword   if then else fi test for in do done
syn keyword configspecial   cat rm eval

" This shortens the script, see syn-ext-match..
syn region  configstring    start=+\z(["'`]\)+ skip=+\\\z1+ end=+\z1+ contains=@Spell

" Anything inside AC_MSG_TYPE([...])  and AC_MSG_TYPE(...) is a string.
syn region  configstring matchgroup=configfunction start="AC_MSG_[A-Z]*\ze(\[" matchgroup=configdelimiter end="\])" contains=configdelimiter,@Spell
syn region  configstring matchgroup=configfunction start="AC_MSG_[A-Z]*\ze([^[]" matchgroup=configdelimiter end=")" contains=configdelimiter,@Spell

" Define the default highlighting.
" Only when an item doesn't have highlighting yet
command -nargs=+ HiLink hi def link <args>

HiLink configdelimiter Delimiter
HiLink configoperator  Operator
HiLink configcomment   Comment
HiLink configDnl  	 Comment
HiLink configfunction  Function
HiLink confignumber    Number
HiLink configkeyword   Keyword
HiLink configspecial   Special
HiLink configstring    String

delcommand HiLink

let b:current_syntax = "config"

" vim: ts=4