[PATCH v3 1/6] lib: change default for notmuch_query_set_omit_excluded

[Mark Walters <markwalters1009@gmail.com>]

---
 lib/notmuch.h |   23 ++++++++++++++++++-----
 lib/query.cc  |   10 +++++-----
 2 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/lib/notmuch.h b/lib/notmuch.h
index babd208..673c423 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -449,12 +449,25 @@ typedef enum {
 const char *
 notmuch_query_get_query_string (notmuch_query_t *query);
 
-/* Specify whether to results should omit the excluded results rather
- * than just marking them excluded. This is useful for passing a
- * notmuch_messages_t not containing the excluded messages to other
- * functions. */
+/* Specify whether to omit excluded results or simply flag them.  By
+ * default, this is set to TRUE.
+ *
+ * If this is TRUE, notmuch_query_search_messages will omit excluded
+ * messages from the results.  notmuch_query_search_threads will omit
+ * threads that match only in excluded messages, but will include all
+ * messages in threads that match in at least one non-excluded
+ * message.
+ *
+ * The performance difference when calling
+ * notmuch_query_search_messages should be relatively small (and both
+ * should be very fast).  However, in some cases,
+ * notmuch_query_search_threads is very much faster when omitting
+ * excluded messages as it does not need to construct the threads that
+ * only match in excluded messages.
+ */
+
 void
-notmuch_query_set_omit_excluded_messages (notmuch_query_t *query, notmuch_bool_t omit);
+notmuch_query_set_omit_excluded (notmuch_query_t *query, notmuch_bool_t omit_excluded);
 
 /* Specify the sorting desired for this query. */
 void
diff --git a/lib/query.cc b/lib/query.cc
index 68ac1e4..e9c1a2d 100644
--- a/lib/query.cc
+++ b/lib/query.cc
@@ -28,7 +28,7 @@ struct _notmuch_query {
     const char *query_string;
     notmuch_sort_t sort;
     notmuch_string_list_t *exclude_terms;
-    notmuch_bool_t omit_excluded_messages;
+    notmuch_bool_t omit_excluded;
 };
 
 typedef struct _notmuch_mset_messages {
@@ -92,7 +92,7 @@ notmuch_query_create (notmuch_database_t *notmuch,
 
     query->exclude_terms = _notmuch_string_list_create (query);
 
-    query->omit_excluded_messages = FALSE;
+    query->omit_excluded = TRUE;
 
     return query;
 }
@@ -104,9 +104,9 @@ notmuch_query_get_query_string (notmuch_query_t *query)
 }
 
 void
-notmuch_query_set_omit_excluded_messages (notmuch_query_t *query, notmuch_bool_t omit)
+notmuch_query_set_omit_excluded (notmuch_query_t *query, notmuch_bool_t omit_excluded)
 {
-    query->omit_excluded_messages = omit;
+    query->omit_excluded = omit_excluded;
 }
 
 void
@@ -220,7 +220,7 @@ notmuch_query_search_messages (notmuch_query_t *query)
 	if (query->exclude_terms) {
 	    exclude_query = _notmuch_exclude_tags (query, final_query);
 
-	    if (query->omit_excluded_messages)
+	    if (query->omit_excluded)
 		final_query = Xapian::Query (Xapian::Query::OP_AND_NOT,
 					     final_query, exclude_query);
 	    else {
-- 
1.7.9.1