Rename MatrixTools to Rooms

Since all the functions therein are to do with rooms, so this name is probably more helpful

src/Rooms.js

@@ -0,0 +1,80 @@
+/*
+Copyright 2015, 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.
+*/
+var CallHandler = require('./CallHandler');
+
+module.exports = {
+    /**
+     * Given a room object, return the alias we should use for it,
+     * if any. This could be the canonical alias if one exists, otherwise
+     * an alias selected arbitrarily but deterministically from the list
+     * of aliases. Otherwise return null;
+     */
+    getDisplayAliasForRoom: function(room) {
+        return room.getCanonicalAlias() || room.getAliases()[0];
+    },
+
+    /**
+     * If the room contains only two members including the logged-in user,
+     * return the other one. Otherwise, return null.
+     */
+    getOnlyOtherMember(room, me) {
+        const joinedMembers = room.getJoinedMembers();
+
+        if (joinedMembers.length === 2) {
+            return joinedMembers.filter(function(m) {
+                return m.userId !== me.userId
+            })[0];
+        }
+
+        return null;
+    },
+
+    isConfCallRoom: function(room, me, conferenceHandler) {
+        if (!conferenceHandler) return false;
+
+        if (me.membership != "join") {
+            return false;
+        }
+
+        const otherMember = this.getOnlyOtherMember(room, me);
+        if (otherMember === null) {
+            return false;
+        }
+
+        if (conferenceHandler.isConferenceUser(otherMember.userId)) {
+            return true;
+        }
+    },
+
+    looksLikeDirectMessageRoom: function(room, me) {
+        if (me.membership == "join" || me.membership === "ban" ||
+            (me.membership === "leave" && me.events.member.getSender() !== me.events.member.getStateKey()))
+        {
+            // Used to split rooms via tags
+            const tagNames = Object.keys(room.tags);
+            // Used for 1:1 direct chats
+            const joinedMembers = room.getJoinedMembers();
+
+            // Show 1:1 chats in seperate "Direct Messages" section as long as they haven't
+            // been moved to a different tag section
+            if (joinedMembers.length === 2 && !tagNames.length) {
+                return true;
+            }
+        }
+        return false;
+    },
+}
+