[PATCH 4/6] lib: Add an iterator over all messages in a thread

[Austin Clements]

Previously, getting the list of all messages in a thread required
recursively traversing the thread's message hierarchy, which was both
difficult and resulted in messages being out of order.  This adds a
public function to retrieve an iterator over all of the messages in a
thread in oldest-first order.
---
 lib/notmuch.h |   13 +++++++------
 lib/thread.cc |    6 ++++++
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/lib/notmuch.h b/lib/notmuch.h
index 3633bed..3739336 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -719,20 +719,21 @@ int
 notmuch_thread_get_total_messages (notmuch_thread_t *thread);
 
 /* Get a notmuch_messages_t iterator for the top-level messages in
- * 'thread'.
+ * 'thread' in oldest-first order.
  *
  * This iterator will not necessarily iterate over all of the messages
  * in the thread. It will only iterate over the messages in the thread
  * which are not replies to other messages in the thread.
- *
- * To iterate over all messages in the thread, the caller will need to
- * iterate over the result of notmuch_message_get_replies for each
- * top-level message (and do that recursively for the resulting
- * messages, etc.).
  */
 notmuch_messages_t *
 notmuch_thread_get_toplevel_messages (notmuch_thread_t *thread);
 
+/* Get a notmuch_thread_t iterator for all messages in 'thread' in
+ * oldest-first order.
+ */
+notmuch_messages_t *
+notmuch_thread_get_messages (notmuch_thread_t *thread);
+
 /* Get the number of messages in 'thread' that matched the search.
  *
  * This count includes only the messages in this thread that were
diff --git a/lib/thread.cc b/lib/thread.cc
index 45a7d1d..c126aac 100644
--- a/lib/thread.cc
+++ b/lib/thread.cc
@@ -508,6 +508,12 @@ notmuch_thread_get_toplevel_messages (notmuch_thread_t *thread)
     return _notmuch_messages_create (thread->toplevel_list);
 }
 
+notmuch_messages_t *
+notmuch_thread_get_messages (notmuch_thread_t *thread)
+{
+    return _notmuch_messages_create (thread->message_list);
+}
+
 const char *
 notmuch_thread_get_thread_id (notmuch_thread_t *thread)
 {
-- 
1.7.10.4