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+From: Jani Nikula <jani@nikula.org>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH v6 1/6] lib: add function to get the number of threads\r
+ matching a search\r
+Date: Sun, 13 Nov 2011 23:15:30 +0200\r
+Message-Id:\r
+ <a6b88f21c57d64605f25235a3a82264fc837d252.1321217854.git.jani@nikula.org>\r
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+References: <cover.1321217854.git.jani@nikula.org>\r
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+\r
+Add function notmuch_query_count_threads() to get the number of threads\r
+matching a search. This is done by performing a search and figuring out the\r
+number of unique thread IDs in the matching messages, a significantly\r
+heavier operation than notmuch_query_count_messages().\r
+\r
+Signed-off-by: Jani Nikula <jani@nikula.org>\r
+---\r
+ lib/notmuch.h | 14 ++++++++++++++\r
+ lib/query.cc | 44 ++++++++++++++++++++++++++++++++++++++++++++\r
+ 2 files changed, 58 insertions(+), 0 deletions(-)\r
+\r
+diff --git a/lib/notmuch.h b/lib/notmuch.h\r
+index c4330e4..9f23a10 100644\r
+--- a/lib/notmuch.h\r
++++ b/lib/notmuch.h\r
+@@ -609,6 +609,20 @@ notmuch_threads_destroy (notmuch_threads_t *threads);\r
+ unsigned\r
+ notmuch_query_count_messages (notmuch_query_t *query);\r
+ \r
++/* Return the number of threads matching a search.\r
++ *\r
++ * This function performs a search and returns the number of unique thread IDs\r
++ * in the matching messages. This is the same as number of threads matching a\r
++ * search.\r
++ *\r
++ * Note that this is a significantly heavier operation than\r
++ * notmuch_query_count_messages().\r
++ *\r
++ * If an error occurs, this function may return 0.\r
++ */\r
++unsigned\r
++notmuch_query_count_threads (notmuch_query_t *query);\r
++\r
+ /* Get the thread ID of 'thread'.\r
+ *\r
+ * The returned string belongs to 'thread' and as such, should not be\r
+diff --git a/lib/query.cc b/lib/query.cc\r
+index 6f02b04..b6c0f12 100644\r
+--- a/lib/query.cc\r
++++ b/lib/query.cc\r
+@@ -457,3 +457,47 @@ notmuch_query_count_messages (notmuch_query_t *query)\r
+ \r
+ return count;\r
+ }\r
++\r
++unsigned\r
++notmuch_query_count_threads (notmuch_query_t *query)\r
++{\r
++ notmuch_messages_t *messages;\r
++ GHashTable *hash;\r
++ unsigned int count;\r
++ notmuch_sort_t sort;\r
++\r
++ sort = query->sort;\r
++ query->sort = NOTMUCH_SORT_UNSORTED;\r
++ messages = notmuch_query_search_messages (query);\r
++ query->sort = sort;\r
++ if (messages == NULL)\r
++ return 0;\r
++\r
++ hash = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, NULL);\r
++ if (hash == NULL) {\r
++ talloc_free (messages);\r
++ return 0;\r
++ }\r
++\r
++ while (notmuch_messages_valid (messages)) {\r
++ notmuch_message_t *message = notmuch_messages_get (messages);\r
++ const char *thread_id = notmuch_message_get_thread_id (message);\r
++ char *thread_id_copy = talloc_strdup (messages, thread_id);\r
++ if (unlikely (thread_id_copy == NULL)) {\r
++ notmuch_message_destroy (message);\r
++ count = 0;\r
++ goto DONE;\r
++ }\r
++ g_hash_table_insert (hash, thread_id_copy, NULL);\r
++ notmuch_message_destroy (message);\r
++ notmuch_messages_move_to_next (messages);\r
++ }\r
++\r
++ count = g_hash_table_size (hash);\r
++\r
++ DONE:\r
++ g_hash_table_unref (hash);\r
++ talloc_free (messages);\r
++\r
++ return count;\r
++}\r
+-- \r
+1.7.5.4\r
+\r
projects / notmuch-archives.git / commitdiff