[PATCH v2] grep -O: Do not pass color sequences as filenames to pager

[Jonathan Nieder <jrnieder@gmail.com>]

From: Nazri Ramliy <ayiehere@gmail.com>

With a .gitconfig like this:

 [color]
	ui = auto
 [color "grep"]
	filename = magenta

if stdout is a terminal, the grep machinery will output the color
sequence \e[36m before each filename in its output.

In the case of "git grep -O foo", output is argv for the pager.
Disable color when calling the grep machinery in this case.

Signed-off-by: Nazri Ramliy <ayiehere@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
Nazri Ramliy wrote:

> You'll have to set "color.grep.filename" too in order to break the two
> test cases.

Thanks.

 builtin/grep.c       |    1 +
 t/t7811-grep-open.sh |   15 +++++++++++++++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/builtin/grep.c b/builtin/grep.c
index 232cd1c..597f76b 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -1001,6 +1001,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 	if (show_in_pager == default_pager)
 		show_in_pager = git_pager(1);
 	if (show_in_pager) {
+		opt.color = 0;
 		opt.name_only = 1;
 		opt.null_following_name = 1;
 		opt.output_priv = &path_list;
diff --git a/t/t7811-grep-open.sh b/t/t7811-grep-open.sh
index c110441..568a6f2 100755
--- a/t/t7811-grep-open.sh
+++ b/t/t7811-grep-open.sh
@@ -125,6 +125,21 @@ test_expect_success 'modified file' '
 	test_cmp empty out
 '
 
+test_config() {
+	git config "$1" "$2" &&
+	test_when_finished "git config --unset $1"
+}
+
+test_expect_success 'copes with color settings' '
+	rm -f actual &&
+	echo grep.h >expect &&
+	test_config color.grep always &&
+	test_config color.grep.filename yellow &&
+	test_config color.grep.separator green &&
+	git grep -O'\''printf "%s\n" >actual'\'' GREP_AND &&
+	test_cmp expect actual
+'
+
 test_expect_success 'run from subdir' '
 	rm -f actual &&
 	echo grep.c >expect &&
-- 
1.7.1.1