+static void
+_thread_add_author (notmuch_thread_t *thread,
+ const char *author)
+{
+ if (author == NULL)
+ return;
+
+ if (g_hash_table_lookup_extended (thread->authors_hash,
+ author, NULL, NULL))
+ return;
+
+ g_hash_table_insert (thread->authors_hash, xstrdup (author), NULL);
+
+ if (thread->authors)
+ thread->authors = talloc_asprintf (thread, "%s, %s",
+ thread->authors,
+ author);
+ else
+ thread->authors = talloc_strdup (thread, author);
+}
+
+static void
+_thread_add_message (notmuch_thread_t *thread,
+ notmuch_message_t *message)
+{
+ notmuch_tags_t *tags;
+ const char *tag;
+ InternetAddressList *list;
+ InternetAddress *address;
+ const char *from, *author;
+
+ from = notmuch_message_get_header (message, "from");
+ list = internet_address_list_parse_string (from);
+ if (list) {
+ address = internet_address_list_get_address (list, 0);
+ if (address) {
+ author = internet_address_get_name (address);
+ if (author == NULL) {
+ InternetAddressMailbox *mailbox;
+ mailbox = INTERNET_ADDRESS_MAILBOX (address);
+ author = internet_address_mailbox_get_addr (mailbox);
+ }
+ _thread_add_author (thread, author);
+ }
+ g_object_unref (G_OBJECT (list));
+ }
+
+ 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);
+ }
+
+ thread->total_messages++;
+}
+
+static void
+_thread_add_matched_message (notmuch_thread_t *thread,
+ notmuch_message_t *message)
+{
+ time_t date;
+
+ date = notmuch_message_get_date (message);
+
+ if (date < thread->oldest || ! thread->matched_messages)
+ thread->oldest = date;
+
+ if (date > thread->newest || ! thread->matched_messages)
+ thread->newest = date;
+
+ thread->matched_messages++;
+}
+
+/* Create a new notmuch_thread_t object for the given thread ID,
+ * treating any messages matching 'query_string' as "matched".