+
+
+notmuch_tags_t *
+notmuch_messages_collect_tags (notmuch_messages_t *messages)
+{
+ notmuch_string_list_t *tags;
+ notmuch_tags_t *msg_tags;
+ notmuch_message_t *msg;
+ GHashTable *htable;
+ GList *keys, *l;
+ const char *tag;
+
+ tags = _notmuch_string_list_create (messages);
+ if (tags == NULL) return NULL;
+
+ htable = g_hash_table_new_full (g_str_hash, g_str_equal, free, NULL);
+
+ while ((msg = notmuch_messages_get (messages))) {
+ msg_tags = notmuch_message_get_tags (msg);
+ while ((tag = notmuch_tags_get (msg_tags))) {
+ g_hash_table_insert (htable, xstrdup (tag), NULL);
+ notmuch_tags_move_to_next (msg_tags);
+ }
+ notmuch_tags_destroy (msg_tags);
+ notmuch_message_destroy (msg);
+ notmuch_messages_move_to_next (messages);
+ }
+
+ keys = g_hash_table_get_keys (htable);
+ for (l = keys; l; l = l->next) {
+ _notmuch_string_list_append (tags, (char *)l->data);
+ }
+
+ g_list_free (keys);
+ g_hash_table_destroy (htable);
+
+ _notmuch_string_list_sort (tags);
+ return _notmuch_tags_create (messages, tags);
+}