/usr/share/source-highlight/m4.lang is in libsource-highlight-common 3.1.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | # language definition for m4 files
state keyword start "dnl" begin
# avoid spaces in front of urls or @[[:alpha:]]+ be caputured as prefixes
comment = '[[:blank:]]+'
include "url.lang"
include "html_simple.lang"
type = '@[[:alpha:]]+'
# everything else is a comment
comment = '.+'
end
comment start "#"
string delim "\"" "\"" escape "\\"
variable = '\$[[:digit:]]+'
# it's better not to rely on sh.lang, otherwise, too many things
# will be highlighted, and often not correctly: better to highlight less
# like emacs does
# since ## is not a comment in shell scripts, but it is in m4
# we kind of redefine multiple #'s as comments
# comment start '#+'
# include "sh.lang"
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