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

Mentored-by: Christian Couder <christian.cou...@gmail.com>
Mentored-by: Matthieu Moy <matthieu....@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik....@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

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