log-tree: make ref_filter_match() a helper method

The ref_filter_match() method is defined in refs.h and implemented
in refs.c, but is only used by add_ref_decoration() in log-tree.c.
Move it into that file as a static helper method. The
match_ref_pattern() comes along for the ride.

While moving the code, also make a slight adjustment to have
ref_filter_match() take a struct decoration_filter pointer instead
of multiple string lists. This is non-functional, but will make a
later change be much cleaner.

The diff is easier to parse when using the --color-moved option.

Reported-by: Junio C Hamano <gister@pobox.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

log-tree.c

@@ -81,16 +81,59 @@ const struct name_decoration *get_name_decoration(const struct object *obj)
 	return lookup_decoration(&name_decoration, obj);
 }
 
+static int match_ref_pattern(const char *refname,
+			     const struct string_list_item *item)
+{
+	int matched = 0;
+	if (item->util == NULL) {
+		if (!wildmatch(item->string, refname, 0))
+			matched = 1;
+	} else {
+		const char *rest;
+		if (skip_prefix(refname, item->string, &rest) &&
+		    (!*rest || *rest == '/'))
+			matched = 1;
+	}
+	return matched;
+}
+
+static int ref_filter_match(const char *refname,
+			    const struct decoration_filter *filter)
+{
+	struct string_list_item *item;
+	const struct string_list *exclude_patterns = filter->exclude_ref_pattern;
+	const struct string_list *include_patterns = filter->include_ref_pattern;
+
+	if (exclude_patterns && exclude_patterns->nr) {
+		for_each_string_list_item(item, exclude_patterns) {
+			if (match_ref_pattern(refname, item))
+				return 0;
+		}
+	}
+
+	if (include_patterns && include_patterns->nr) {
+		int found = 0;
+		for_each_string_list_item(item, include_patterns) {
+			if (match_ref_pattern(refname, item)) {
+				found = 1;
+				break;
+			}
+		}
+
+		if (!found)
+			return 0;
+	}
+	return 1;
+}
+
 static int add_ref_decoration(const char *refname, const struct object_id *oid,
 			      int flags, void *cb_data)
 {
 	struct object *obj;
 	enum decoration_type type = DECORATION_NONE;
 	struct decoration_filter *filter = (struct decoration_filter *)cb_data;
 
-	if (filter && !ref_filter_match(refname,
-			      filter->include_ref_pattern,
-			      filter->exclude_ref_pattern))
+	if (filter && !ref_filter_match(refname, filter))
 		return 0;
 
 	if (starts_with(refname, git_replace_ref_base)) {

refs.c

@@ -321,50 +321,6 @@ int ref_exists(const char *refname)
 	return refs_ref_exists(get_main_ref_store(the_repository), refname);
 }
 
-static int match_ref_pattern(const char *refname,
-			     const struct string_list_item *item)
-{
-	int matched = 0;
-	if (item->util == NULL) {
-		if (!wildmatch(item->string, refname, 0))
-			matched = 1;
-	} else {
-		const char *rest;
-		if (skip_prefix(refname, item->string, &rest) &&
-		    (!*rest || *rest == '/'))
-			matched = 1;
-	}
-	return matched;
-}
-
-int ref_filter_match(const char *refname,
-		     const struct string_list *include_patterns,
-		     const struct string_list *exclude_patterns)
-{
-	struct string_list_item *item;
-
-	if (exclude_patterns && exclude_patterns->nr) {
-		for_each_string_list_item(item, exclude_patterns) {
-			if (match_ref_pattern(refname, item))
-				return 0;
-		}
-	}
-
-	if (include_patterns && include_patterns->nr) {
-		int found = 0;
-		for_each_string_list_item(item, include_patterns) {
-			if (match_ref_pattern(refname, item)) {
-				found = 1;
-				break;
-			}
-		}
-
-		if (!found)
-			return 0;
-	}
-	return 1;
-}
-
 static int filter_refs(const char *refname, const struct object_id *oid,
 			   int flags, void *data)
 {

refs.h

@@ -361,18 +361,6 @@ int for_each_rawref(each_ref_fn fn, void *cb_data);
 void normalize_glob_ref(struct string_list_item *item, const char *prefix,
 			const char *pattern);
 
-/*
- * Returns 0 if refname matches any of the exclude_patterns, or if it doesn't
- * match any of the include_patterns. Returns 1 otherwise.
- *
- * If pattern list is NULL or empty, matching against that list is skipped.
- * This has the effect of matching everything by default, unless the user
- * specifies rules otherwise.
- */
-int ref_filter_match(const char *refname,
-		     const struct string_list *include_patterns,
-		     const struct string_list *exclude_patterns);
-
 static inline const char *has_glob_specials(const char *pattern)
 {
 	return strpbrk(pattern, "?*[");