void
_notmuch_message_add_reply (notmuch_message_t *message,
notmuch_message_t *reply);
-notmuch_database_t *
-_notmuch_message_database (notmuch_message_t *message);
void
_notmuch_message_remove_unprefixed_terms (notmuch_message_t *message);
+
+const char *
+_notmuch_message_get_thread_id_only(notmuch_message_t *message);
+
/* sha1.c */
char *