Tag list handling: add two new helpers

taglist_added() simply figures out the tags that are in the new list but
not in the original list.

taglist_dump() makes debugging things easier.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/dive.c b/dive.c
index 07b057be6..2ecb56d06 100644
--- a/dive.c
+++ b/dive.c
@@ -2642,7 +2642,29 @@ static bool taglist_contains_all(struct tag_entry *subtl, struct tag_entry *supe
 		subtl = subtl->next;
 	}
 	return true;
+}
 
+struct tag_entry *taglist_added(struct tag_entry *original_list, struct tag_entry *new_list)
+{
+	struct tag_entry *added_list = NULL;
+	while (new_list) {
+		if (!taglist_contains(original_list, new_list->tag->name))
+			taglist_add_tag(&added_list, new_list->tag->name);
+		new_list = new_list->next;
+	}
+	return added_list;
+}
+
+void dump_taglist(const char *intro, struct tag_entry *tl)
+{
+	char *comma = "";
+	fprintf(stderr, "%s", intro);
+	while(tl) {
+		fprintf(stderr, "%s %s", comma, tl->tag->name);
+		comma = ",";
+		tl = tl->next;
+	}
+	fprintf(stderr, "\n");
 }
 
 // if tl1 is both a subset and superset of tl2 they must be the same