+
+notmuch_tags_t *
+_notmuch_convert_tags (void *ctx, Xapian::TermIterator &i,
+ Xapian::TermIterator &end)
+{
+ const char *prefix = _find_prefix ("tag");
+ notmuch_tags_t *tags;
+ std::string tag;
+
+ /* Currently this iteration is written with the assumption that
+ * "tag" has a single-character prefix. */
+ assert (strlen (prefix) == 1);
+
+ tags = _notmuch_tags_create (ctx);
+ if (unlikely (tags == NULL))
+ return NULL;
+
+ i.skip_to (prefix);
+
+ while (i != end) {
+ tag = *i;
+
+ if (tag.empty () || tag[0] != *prefix)
+ break;
+
+ _notmuch_tags_add_tag (tags, tag.c_str () + 1);
+
+ i++;
+ }
+
+ _notmuch_tags_prepare_iterator (tags);
+
+ return tags;
+}
+
+notmuch_tags_t *
+notmuch_database_get_all_tags (notmuch_database_t *db)
+{
+ Xapian::TermIterator i, end;
+ i = db->xapian_db->allterms_begin();
+ end = db->xapian_db->allterms_end();
+ return _notmuch_convert_tags(db, i, end);
+}