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" 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
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