-void
-_notmuch_thread_set_subject (notmuch_thread_t *thread, const char *subject)
-{
- thread->subject = talloc_strdup (thread, subject);
+ if (! thread->subject) {
+ const char *subject;
+ subject = notmuch_message_get_header (message, "subject");
+ thread->subject = talloc_strdup (thread, subject);
+ }
+
+ for (tags = notmuch_message_get_tags (message);
+ notmuch_tags_has_more (tags);
+ notmuch_tags_advance (tags))
+ {
+ tag = notmuch_tags_get (tags);
+ g_hash_table_insert (thread->tags, xstrdup (tag), NULL);
+ }
+
+ date = notmuch_message_get_date (message);
+
+ if (date < thread->oldest || ! thread->has_message)
+ thread->oldest = date;
+
+ if (date > thread->newest || ! thread->has_message)
+ thread->newest = date;
+
+ thread->has_message = 1;