X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=lib%2Fmessage.cc;h=26b5e76e9636b67e43ca5c42c08210f73c70f0c2;hp=1ddce3c692bebdc94fa22023a7b80d05345d69c4;hb=7f57b747b95eece465d10fd0acba20cc3dd868f1;hpb=c9e1c4f1c495d7cc24a64b73edb4b7b71791a87f

diff --git a/lib/message.cc b/lib/message.cc
index 1ddce3c6..26b5e76e 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -998,6 +998,16 @@ _notmuch_message_set_header_values (notmuch_message_t *message,
     message->modified = TRUE;
 }
 
+/* Upgrade a message to support NOTMUCH_FEATURE_LAST_MOD.  The caller
+ * must call _notmuch_message_sync. */
+void
+_notmuch_message_upgrade_last_mod (notmuch_message_t *message)
+{
+    /* _notmuch_message_sync will update the last modification
+     * revision; we just have to ask it to. */
+    message->modified = TRUE;
+}
+
 /* Synchronize changes made to message->doc out into the database. */
 void
 _notmuch_message_sync (notmuch_message_t *message)
@@ -1010,6 +1020,18 @@ _notmuch_message_sync (notmuch_message_t *message)
     if (! message->modified)
 	return;
 
+    /* Update the last modification of this message. */
+    if (message->notmuch->features & NOTMUCH_FEATURE_LAST_MOD)
+	/* sortable_serialise gives a reasonably compact encoding,
+	 * which directly translates to reduced IO when scanning the
+	 * value stream.  Since it's built for doubles, we only get 53
+	 * effective bits, but that's still enough for the database to
+	 * last a few centuries at 1 million revisions per second. */
+	message->doc.add_value (NOTMUCH_VALUE_LAST_MOD,
+				Xapian::sortable_serialise (
+				    _notmuch_database_new_revision (
+					message->notmuch)));
+
     db = static_cast <Xapian::WritableDatabase *> (message->notmuch->xapian_db);
     db->replace_document (message->doc_id, message->doc);
     message->modified = FALSE;