add git-commit message lexer & its file extension in detect

Author: jeremybobbin

lexers/git-commit.lua

@@ -0,0 +1,59 @@
+-- Copyright 2017-2025 Marc André Tanner. See LICENSE.
+-- git-rebase(1) LPeg lexer.
+
+local lexer = lexer
+local P, R, S, Cp = lpeg.P, lpeg.R, lpeg.S, lpeg.Cp()
+
+local lex = lexer.new(...)
+
+-- Comments.
+lex:add_rule('comment', lex:tag(lexer.COMMENT, lexer.to_eol(lexer.starts_line('#'))))
+
+-- Keywords.
+lex:add_rule('keyword', lex:tag(lexer.KEYWORD, lexer.starts_line(lex:word_match(lexer.KEYWORD))*':'))
+
+local function zero(_, n)
+	local fn, i = lexer.line_from_position, -1
+	i = fn(n+1)
+	return i <= 1
+end
+
+local message = (((lpeg.Cmt(Cp, zero)) * ((((- S"\n")^-72) *  S"\n") + ((P(1) - S"\n")^-71 * P(1)))))
+lex:add_rule('message', lex:tag(lexer.STRING, lexer.starts_line(message)))
+
+-- Commit SHA1.
+local function patn(pat, min, max)
+	return -pat^(max + 1) * pat^min
+end
+
+lex:add_rule('hash', lex:tag(lexer.NUMBER, patn(R('09', 'af'), 7, 40)))
+
+-- Word lists.
+lex:set_word_list(lexer.KEYWORD, [[
+Acked-by
+Co-authored-by
+Reported-and-tested-by
+Reported-by
+Reviewed-by
+Signed-off-by
+Suggested-by
+Tested-by
+To
+Cc
+From
+After
+Before
+Bluetooth
+Closes
+Code
+Documentation
+Fixes
+Input
+Note
+Oops
+Staging
+Summary
+Warning
+]])
+
+return lex

lexers/git-rebase.lua

@@ -1,5 +1,4 @@
--- Copyright 2017-2025 Marc André Tanner. See LICENSE.
--- git-rebase(1) LPeg lexer.
+-- git-rebase(1)
 
 local lexer = lexer
 local P, R = lpeg.P, lpeg.R

lexers/lexer.lua

@@ -1640,7 +1640,7 @@ function M.detect(filename, line)
 		f90 = 'fortran', f95 = 'fortran', f03 = 'fortran', f08 = 'fortran', --
 		fstab = 'fstab', --
 		gd = 'gap', gi = 'gap', gap = 'gap', --
-		['git-rebase-todo'] = 'git-rebase' --
+		['git-rebase-todo'] = 'git-rebase', ['COMMIT_EDITMSG'] = 'git-commit', --
 		gmi = 'gemini', --
 		po = 'gettext', pot = 'gettext', --
 		feature = 'gherkin', --