[PATCH v8 04/11] for-each-ref: add '--points-at' option

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Add the '--points-at' option provided by 'ref-filter'. The
option lets the user to list only refs which points at the
given object.

Add documentation and tests for the same.

Based-on-patch-by: Jeff King <peff@xxxxxxxx>
Mentored-by: Christian Couder <christian.couder@xxxxxxxxx>
Mentored-by: Matthieu Moy <matthieu.moy@xxxxxxxxxxxxxxx>
Signed-off-by: Karthik Nayak <karthik.188@xxxxxxxxx>
---
 Documentation/git-for-each-ref.txt |  3 +++
 builtin/for-each-ref.c             |  9 +++++++--
 t/t6302-for-each-ref-filter.sh     | 20 ++++++++++++++++++++
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-for-each-ref.txt b/Documentation/git-for-each-ref.txt
index 7f8d9a5..ff0283b 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -10,6 +10,7 @@ SYNOPSIS
 [verse]
 'git for-each-ref' [--count=<count>] [--shell|--perl|--python|--tcl]
 		   [(--sort=<key>)...] [--format=<format>] [<pattern>...]
+		   [--points-at <object>]
 
 DESCRIPTION
 -----------
@@ -62,6 +63,8 @@ OPTIONS
 	the specified host language.  This is meant to produce
 	a scriptlet that can directly be `eval`ed.
 
+--points-at <object>::
+	Only list refs which points at the given object.
 
 FIELD NAMES
 -----------
diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index 7919206..ae5419e 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -7,6 +7,7 @@
 
 static char const * const for_each_ref_usage[] = {
 	N_("git for-each-ref [<options>] [<pattern>]"),
+	N_("git for-each-ref [--points-at <object>]"),
 	NULL
 };
 
@@ -34,9 +35,15 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 		OPT_STRING(  0 , "format", &format, N_("format"), N_("format to use for the output")),
 		OPT_CALLBACK(0 , "sort", sorting_tail, N_("key"),
 			    N_("field name to sort on"), &parse_opt_ref_sorting),
+		OPT_CALLBACK(0, "points-at", &filter.points_at,
+			     N_("object"), N_("print only refs which points at the given object"),
+			     parse_opt_object_name),
 		OPT_END(),
 	};
 
+	memset(&array, 0, sizeof(array));
+	memset(&filter, 0, sizeof(filter));
+
 	parse_options(argc, argv, prefix, opts, for_each_ref_usage, 0);
 	if (maxcount < 0) {
 		error("invalid --count argument: `%d'", maxcount);
@@ -55,8 +62,6 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 	/* for warn_ambiguous_refs */
 	git_config(git_default_config, NULL);
 
-	memset(&array, 0, sizeof(array));
-	memset(&filter, 0, sizeof(filter));
 	filter.name_patterns = argv;
 	filter_refs(&array, &filter, FILTER_REFS_ALL | FILTER_REFS_INCLUDE_BROKEN);
 	ref_array_sort(sorting, &array);
diff --git a/t/t6302-for-each-ref-filter.sh b/t/t6302-for-each-ref-filter.sh
index 44d2f24..457991f 100755
--- a/t/t6302-for-each-ref-filter.sh
+++ b/t/t6302-for-each-ref-filter.sh
@@ -17,4 +17,24 @@ test_expect_success 'setup some history and refs' '
 	git update-ref refs/odd/spot master
 '
 
+test_expect_success 'filtering with --points-at' '
+	cat >expect <<-\EOF &&
+	refs/heads/master
+	refs/odd/spot
+	refs/tags/three
+	EOF
+	git for-each-ref --format="%(refname)" --points-at=master >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'check signed tags with --points-at' '
+	sed -e "s/Z$//" >expect <<-\EOF &&
+	refs/heads/side Z
+	refs/tags/four Z
+	refs/tags/signed-tag four
+	EOF
+	git for-each-ref --format="%(refname) %(*subject)" --points-at=side >actual &&
+	test_cmp expect actual
+'
+
 test_done
-- 
2.4.5

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