Order room list by most recent activity

src/RoomListSorter.js

@@ -0,0 +1,31 @@
+/*
+Copyright 2015 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+'use strict';
+
+function tsOfNewestEvent(room) {
+    return room.timeline[room.timeline.length - 1].getTs();
+}
+
+function mostRecentFirst(roomList) {
+    return roomList.sort(function(a,b) {
+        return tsOfNewestEvent(b) - tsOfNewestEvent(a);
+    });
+}
+
+module.exports = {
+    mostRecentFirst: mostRecentFirst
+};