lib: add function to get the number of threads matching a search

[notmuch] / lib / query.cc

diff --git a/lib/query.cc b/lib/query.cc
index 6f02b04b95dc81def0c240a055b95ea7917153b8..b6c0f12d9cd87f73993be6ef6c822319df888995 100644 (file)
--- a/lib/query.cc
+++ b/lib/query.cc
@@ -457,3 +457,47 @@ notmuch_query_count_messages (notmuch_query_t *query)
 
     return count;
 }
+
+unsigned
+notmuch_query_count_threads (notmuch_query_t *query)
+{
+    notmuch_messages_t *messages;
+    GHashTable *hash;
+    unsigned int count;
+    notmuch_sort_t sort;
+
+    sort = query->sort;
+    query->sort = NOTMUCH_SORT_UNSORTED;
+    messages = notmuch_query_search_messages (query);
+    query->sort = sort;
+    if (messages == NULL)
+       return 0;
+
+    hash = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, NULL);
+    if (hash == NULL) {
+       talloc_free (messages);
+       return 0;
+    }
+
+    while (notmuch_messages_valid (messages)) {
+       notmuch_message_t *message = notmuch_messages_get (messages);
+       const char *thread_id = notmuch_message_get_thread_id (message);
+       char *thread_id_copy = talloc_strdup (messages, thread_id);
+       if (unlikely (thread_id_copy == NULL)) {
+           notmuch_message_destroy (message);
+           count = 0;
+           goto DONE;
+       }
+       g_hash_table_insert (hash, thread_id_copy, NULL);
+       notmuch_message_destroy (message);
+       notmuch_messages_move_to_next (messages);
+    }
+
+    count = g_hash_table_size (hash);
+
+  DONE:
+    g_hash_table_unref (hash);
+    talloc_free (messages);
+
+    return count;
+}