ref-filter: export ref_kind_from_refname()

When filtering refs, `ref_kind_from_refname()` is used to determine the
ref type. In a subsequent commit, this same logic is reused when
counting refs by type. Export the function to prepare for this change.

Signed-off-by: Justin Tobler <jltobler@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: jltobler

ref-filter.c

@@ -2833,7 +2833,7 @@ struct ref_array_item *ref_array_push(struct ref_array *array,
 	return ref;
 }
 
-static int ref_kind_from_refname(const char *refname)
+int ref_kind_from_refname(const char *refname)
 {
 	unsigned int i;
 

ref-filter.h

@@ -135,6 +135,8 @@ struct ref_format {
 	OPT_STRVEC(0, "exclude", &(var)->exclude, \
 		   N_("pattern"), N_("exclude refs which match pattern"))
 
+/* Get the reference kind from the provided reference name. */
+int ref_kind_from_refname(const char *refname);
 /*
  * API for filtering a set of refs. Based on the type of refs the user
  * has requested, we iterate through those refs and apply filters