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+" Vim syntax file
+" Language: M4
+" Maintainer: Claudio Fleiner (claudio@fleiner.com)
+" URL: http://www.fleiner.com/vim/syntax/m4.vim
+" (outdated)
+" Last Change: 2022 Jun 12
+
+" This file will highlight user function calls if they use only
+" capital letters and have at least one argument (i.e. the '('
+" must be there). Let me know if this is a problem.
+
+" quit when a syntax file was already loaded
+if !exists("main_syntax")
+ if exists("b:current_syntax")
+ finish
+ endif
+ " we define it here so that included files can test for it
+ let main_syntax='m4'
+endif
+
+" define the m4 syntax
+syn match m4Variable contained "\$\d\+"
+syn match m4Special contained "$[@*#]"
+syn match m4Comment "\<\(m4_\)\=dnl\>.*" contains=SpellErrors
+syn match m4Comment "#.*" contains=SpellErrors
+syn match m4Constants "\<\(m4_\)\=__file__"
+syn match m4Constants "\<\(m4_\)\=__line__"
+syn keyword m4Constants divnum sysval m4_divnum m4_sysval
+syn region m4Paren matchgroup=m4Delimiter start="(" end=")" contained contains=@m4Top
+syn region m4Command matchgroup=m4Function start="\<\(m4_\)\=\(define\|defn\|pushdef\)(" end=")" contains=@m4Top
+syn region m4Command matchgroup=m4Preproc start="\<\(m4_\)\=\(include\|sinclude\)("he=e-1 end=")" contains=@m4Top
+syn region m4Command matchgroup=m4Statement start="\<\(m4_\)\=\(syscmd\|esyscmd\|ifdef\|ifelse\|indir\|builtin\|shift\|errprint\|m4exit\|changecom\|changequote\|changeword\|m4wrap\|debugfile\|divert\|undivert\)("he=e-1 end=")" contains=@m4Top
+syn region m4Command matchgroup=m4builtin start="\<\(m4_\)\=\(len\|index\|regexp\|substr\|translit\|patsubst\|format\|incr\|decr\|eval\|maketemp\)("he=e-1 end=")" contains=@m4Top
+syn keyword m4Statement divert undivert
+syn region m4Command matchgroup=m4Type start="\<\(m4_\)\=\(undefine\|popdef\)("he=e-1 end=")" contains=@m4Top
+syn region m4Function matchgroup=m4Type start="\<[_A-Z][_A-Z0-9]*("he=e-1 end=")" contains=@m4Top
+syn region m4String start="`" end="'" contains=SpellErrors
+syn cluster m4Top contains=m4Comment,m4Constants,m4Special,m4Variable,m4String,m4Paren,m4Command,m4Statement,m4Function
+
+" Define the default highlighting.
+" Only when an item doesn't have highlighting yet
+hi def link m4Delimiter Delimiter
+hi def link m4Comment Comment
+hi def link m4Function Function
+hi def link m4Keyword Keyword
+hi def link m4Special Special
+hi def link m4String String
+hi def link m4Statement Statement
+hi def link m4Preproc PreProc
+hi def link m4Type Type
+hi def link m4Special Special
+hi def link m4Variable Special
+hi def link m4Constants Constant
+hi def link m4Builtin Statement
+
+let b:current_syntax = "m4"
+
+if main_syntax == 'm4'
+ unlet main_syntax
+endif
+
+" vim: ts=4