switch to 3-digit formatting for counts

src/components/views/rooms/RoomTile.js

@@ -25,6 +25,7 @@ var DMRoomMap = require('../../../utils/DMRoomMap');
 var sdk = require('../../../index');
 var ContextualMenu = require('../../structures/ContextualMenu');
 var RoomNotifs = require('../../../RoomNotifs');
+var FormattingUtils = require('../../../utils/FormattingUtils');
 
 module.exports = React.createClass({
     displayName: 'RoomTile',
@@ -237,7 +238,7 @@ module.exports = React.createClass({
         if (this.state.badgeHover || this.state.notificationTagMenu) {
             badgeContent = "\u00B7\u00B7\u00B7";
         } else if (badges) {
-            var limitedCount = (notificationCount > 99) ? '99+' : notificationCount;
+            var limitedCount = FormattingUtils.formatCount(notificationCount);
             badgeContent = notificationCount ? limitedCount : '!';
         } else {
             badgeContent = '\u200B';

src/utils/FormattingUtils.js

@@ -0,0 +1,28 @@
+/*
+Copyright 2016 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.
+*/
+
+/**
+ * formats numbers to fit into ~3 characters, suitable for badge counts
+ * e.g: 999, 9.9K, 99K, 0.9M, 9.9M, 99M, 0.9B, 9.9B
+ */
+export function formatCount(count) {
+   if (count < 1000) return count;
+   if (count < 10000) return (count / 1000).toFixed(1) + "K";
+   if (count < 100000) return (count / 1000).toFixed(0) + "K";
+   if (count < 10000000) return (count / 1000000).toFixed(1) + "M";
+   if (count < 100000000) return (count / 1000000).toFixed(0) + "M";
+   return (count / 1000000000).toFixed(1) + "B"; // 10B is enough for anyone, right? :S
+}