[RFC/PATCH 5/9] ref-filter: add option to match literal pattern

[Karthik Nayak <karthik.188@gmail.com>]

Since 'ref-filter' only has an option to match path names.
Add an option for regular pattern matching.

Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
---
 builtin/for-each-ref.c |  1 +
 ref-filter.c           | 30 ++++++++++++++++++++++++------
 ref-filter.h           |  3 ++-
 3 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index c318e33..01d5363 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -68,6 +68,7 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 	git_config(git_default_config, NULL);
 
 	filter.name_patterns = argv;
+	filter.match_as_path = 1;
 	filter_refs(&array, &filter, FILTER_REFS_ALL | FILTER_REFS_INCLUDE_BROKEN);
 	ref_array_sort(sorting, &array);
 
diff --git a/ref-filter.c b/ref-filter.c
index e307fab..1f97910 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -954,6 +954,20 @@ static int commit_contains(struct ref_filter *filter, struct commit *commit)
 
 /*
  * Return 1 if the refname matches one of the patterns, otherwise 0.
+ * A pattern can be a literal prefix (e.g. a refname "refs/heads/master"
+ * matches a pattern "refs/heads/m") or a wildcard (e.g. the same ref
+ * matches "refs/heads/m*",too).
+ */
+static int match_pattern(const char **patterns, const char *refname)
+{
+	for (; *patterns; patterns++)
+		if (!wildmatch(*patterns, refname, 0, NULL))
+			return 1;
+	return 0;
+}
+
+/*
+ * Return 1 if the refname matches one of the patterns, otherwise 0.
  * A pattern can be path prefix (e.g. a refname "refs/heads/master"
  * matches a pattern "refs/heads/") or a wildcard (e.g. the same ref
  * matches "refs/heads/m*",too).
@@ -977,6 +991,15 @@ static int match_name_as_path(const char **pattern, const char *refname)
 	return 0;
 }
 
+static int filter_pattern_match(struct ref_filter *filter, const char *refname)
+{
+	if (!*filter->name_patterns)
+		return 0;
+	if (filter->match_as_path)
+		return match_name_as_path(filter->name_patterns, refname);
+	return match_pattern(filter->name_patterns, refname);
+}
+
 /*
  * Given a ref (sha1, refname) see if it points to one of the sha1s
  * in a sha1_array.
@@ -1026,17 +1049,12 @@ static int ref_filter_handler(const char *refname, const struct object_id *oid,
 	struct ref_array_item *ref;
 	struct commit *commit = NULL;
 
-	if (flag & REF_BAD_NAME) {
-		  warning("ignoring ref with broken name %s", refname);
-		  return 0;
-	}
-
 	if (flag & REF_ISBROKEN) {
 		warning("ignoring broken ref %s", refname);
 		return 0;
 	}
 
-	if (*filter->name_patterns && !match_name_as_path(filter->name_patterns, refname))
+	if (!filter_pattern_match(filter, refname))
 		return 0;
 
 	if (!match_points_at(&filter->points_at, oid->hash, refname))
diff --git a/ref-filter.h b/ref-filter.h
index 6b6fb96..a4809c8 100644
--- a/ref-filter.h
+++ b/ref-filter.h
@@ -54,7 +54,8 @@ struct ref_filter {
 	} merge;
 	struct commit *merge_commit;
 
-	unsigned int with_commit_tag_algo: 1;
+	unsigned int with_commit_tag_algo: 1,
+		match_as_path: 1;
 	unsigned int lines;
 };
 
-- 
2.4.4