Factor out presence text. Do prep work for displaying 3pid invites on memberlist.

Factored out presence to PresenceLabel.

src/components/views/rooms/PresenceLabel.js

@@ -0,0 +1,84 @@
+/*
+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.
+*/
+
+'use strict';
+
+var React = require('react');
+
+var MatrixClientPeg = require('../../../MatrixClientPeg');
+var sdk = require('../../../index');
+
+module.exports = React.createClass({
+    displayName: 'PresenceLabel',
+
+    propTypes: {
+        activeAgo: React.PropTypes.number,
+        presenceState: React.PropTypes.string
+    },
+
+    getDefaultProps: function() {
+        return {
+            ago: -1,
+            presenceState: null
+        };
+    },
+
+    getDuration: function(time) {
+        if (!time) return;
+        var t = parseInt(time / 1000);
+        var s = t % 60;
+        var m = parseInt(t / 60) % 60;
+        var h = parseInt(t / (60 * 60)) % 24;
+        var d = parseInt(t / (60 * 60 * 24));
+        if (t < 60) {
+            if (t < 0) {
+                return "0s";
+            }
+            return s + "s";
+        }
+        if (t < 60 * 60) {
+            return m + "m";
+        }
+        if (t < 24 * 60 * 60) {
+            return h + "h";
+        }
+        return d + "d ";
+    },
+
+    getPrettyPresence: function(presence) {
+        if (presence === "online") return "Online";
+        if (presence === "unavailable") return "Idle"; // XXX: is this actually right?
+        if (presence === "offline") return "Offline";
+        return "Unknown";
+    },
+
+    render: function() {
+        if (this.props.activeAgo >= 0) {
+            return (
+                <div className="mx_PresenceLabel">
+                    { this.getPrettyPresence(this.props.presenceState) } { this.getDuration(this.props.activeAgo) } ago
+                </div>
+            );
+        }
+        else {
+            return (
+                <div className="mx_PresenceLabel">
+                    { this.getPrettyPresence(this.props.presenceState) }
+                </div>
+            );
+        }
+    }
+});