[PATCH 4/4] tag: respect color.ui config

[Jeff King <peff@peff.net>]

Since 11b087adfd (ref-filter: consult want_color() before
emitting colors, 2017-07-13), we expect that setting
"color.ui" to "always" will enable color tag formats even
without a tty.  As that commit was built on top of
136c8c8b8f (color: check color.ui in git_default_config(),
2017-07-13) from the same series, we didn't need to touch
tag's config parsing at all.

However, since we reverted 136c8c8b8f, we now need to
explicitly call git_color_default_config() to make this
work.

Let's do so, and also restore the test dropped in 0c88bf5050
(provide --color option for all ref-filter users,
2017-10-03). That commit swapped out our "color.ui=always"
test for "--color" in preparation for "always" going away.
But since it is here to stay, we should test both cases.

Note that for-each-ref also lost its color.ui support as
part of reverting 136c8c8b8f. But as a plumbing command, it
should _not_ respect the color.ui config. Since it also
gained a --color option in 0c88bf5050, that's the correct
way to ask it for color. We'll continue to test that, and
confirm that "color.ui" is not respected.

Signed-off-by: Jeff King <peff@peff.net>
---
 builtin/tag.c           | 2 +-
 t/t6300-for-each-ref.sh | 5 +++++
 t/t7004-tag.sh          | 6 ++++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/builtin/tag.c b/builtin/tag.c
index 695cb0778e..b38329b593 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -158,7 +158,7 @@ static int git_tag_config(const char *var, const char *value, void *cb)
 
 	if (starts_with(var, "column."))
 		return git_column_config(var, value, "tag", &colopts);
-	return git_default_config(var, value, cb);
+	return git_color_default_config(var, value, cb);
 }
 
 static void write_tag_body(int fd, const struct object_id *oid)
diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index 416ff7d0b8..3aa534933e 100755
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -442,6 +442,11 @@ test_expect_success '--color can override tty check' '
 	test_cmp expected.color actual
 '
 
+test_expect_success 'color.ui=always does not override tty check' '
+	git -c color.ui=always for-each-ref --format="$color_format" >actual &&
+	test_cmp expected.bare actual
+'
+
 cat >expected <<\EOF
 heads/master
 tags/master
diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index 4e62c505fc..a9af2de996 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -1918,6 +1918,12 @@ test_expect_success '--color overrides auto-color' '
 	test_cmp expect.color actual
 '
 
+test_expect_success 'color.ui=always overrides auto-color' '
+	git -c color.ui=always tag $color_args >actual.raw &&
+	test_decode_color <actual.raw >actual &&
+	test_cmp expect.color actual
+'
+
 test_expect_success 'setup --merged test tags' '
 	git tag mergetest-1 HEAD~2 &&
 	git tag mergetest-2 HEAD~1 &&
-- 
2.15.0.rc1.395.ga4290b5804