From 1123c67ceee2f310b08ab5d67b076ef04ab59bfc Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Sat, 6 Feb 2010 23:44:15 -0500
Subject: [PATCH] accept "git grep -- pattern"

Currently the only way to "quote" a grep pattern that might
begin with a dash is to use "git grep -e pattern". This
works just fine, and is also the way right way to do it on
many traditional grep implemenations.

Some people prefer to use "git grep -- pattern", however, as
"--" is the usual "end of options" marker, and at least GNU
grep and Solaris 10 grep support this. This patch makes that
syntax work.

There is a slight behavior change, in that "git grep -- $X"
used to be interpreted as "grep for -- in $X". However, that
usage is questionable. "--" is usually the end-of-options
marker, so "git grep" was unlike many other greps in
treating it as a literal pattern (e.g., both GNU grep and
Solaris 10 grep will treat "grep --" as missing a pattern).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin-grep.c  | 10 ++++++++++
 t/t7002-grep.sh | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/builtin-grep.c b/builtin-grep.c
index 26d4deb1cc..63d4b95b0d 100644
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -861,6 +861,16 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 			     PARSE_OPT_STOP_AT_NON_OPTION |
 			     PARSE_OPT_NO_INTERNAL_HELP);
 
+	/*
+	 * skip a -- separator; we know it cannot be
+	 * separating revisions from pathnames if
+	 * we haven't even had any patterns yet
+	 */
+	if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
+		argv++;
+		argc--;
+	}
+
 	/* First unrecognized non-option token */
 	if (argc > 0 && !opt.pattern_list) {
 		append_grep_pattern(&opt, argv[0], "command line", 0,
diff --git a/t/t7002-grep.sh b/t/t7002-grep.sh
index 7144f815c0..0b583cbfc1 100755
--- a/t/t7002-grep.sh
+++ b/t/t7002-grep.sh
@@ -434,4 +434,37 @@ test_expect_success 'grep -Fi' '
 	test_cmp expected actual
 '
 
+test_expect_success 'setup double-dash tests' '
+cat >double-dash <<EOF &&
+--
+->
+other
+EOF
+git add double-dash
+'
+
+cat >expected <<EOF
+double-dash:->
+EOF
+test_expect_success 'grep -- pattern' '
+	git grep -- "->" >actual &&
+	test_cmp expected actual
+'
+test_expect_success 'grep -- pattern -- pathspec' '
+	git grep -- "->" -- double-dash >actual &&
+	test_cmp expected actual
+'
+test_expect_success 'grep -e pattern -- path' '
+	git grep -e "->" -- double-dash >actual &&
+	test_cmp expected actual
+'
+
+cat >expected <<EOF
+double-dash:--
+EOF
+test_expect_success 'grep -e -- -- path' '
+	git grep -e -- -- double-dash >actual &&
+	test_cmp expected actual
+'
+
 test_done