Render group updates

Not pretty, but it works. Also allows for later localization.
Copy/behavior is borrowed from the Android client.

Closes #104
Fixes #65

index.html

@@ -155,6 +155,7 @@
         <script type="text/javascript" src="js/views/notifications.js"></script>
         <script type="text/javascript" src="js/views/file_input_view.js"></script>
         <script type="text/javascript" src="js/views/list_view.js"></script>
+        <script type="text/javascript" src="js/views/group_update_view.js"></script>
         <script type="text/javascript" src="js/views/message_view.js"></script>
         <script type="text/javascript" src="js/views/message_list_view.js"></script>
         <script type="text/javascript" src="js/views/conversation_list_item_view.js"></script>

js/background.js

@@ -138,6 +138,14 @@
                         avatar     : pushMessageContent.group.avatar,
                         members    : pushMessageContent.group.members,
                     };
+                    var group_update = conversation.changedAttributes(_.pick(pushMessageContent.group, 'name', 'avatar'));
+                    var difference = _.difference(pushMessageContent.group.members, conversation.get('members'));
+                    if (difference.length > 0) {
+                        group_update.joined = difference;
+                    }
+                    if (_.keys(group_update).length > 0) {
+                        message.set({group_update: group_update});
+                    }
                 }
                 attributes.active_at = now;
                 conversation.set(attributes);

js/views/group_update_view.js

@@ -0,0 +1,40 @@
+/* vim: ts=4:sw=4:expandtab
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+(function () {
+    'use strict';
+
+    window.Whisper = window.Whisper || {};
+
+    Whisper.GroupUpdateView = Backbone.View.extend({
+        tagName:   "div",
+        className: "group-update",
+        render: function() {
+            //TODO l10n
+            var messages = ['Updated the group.'];
+            if (this.model.name) {
+                messages.push("Title is now '" + this.model.name + "'.");
+            }
+            if (this.model.joined) {
+                messages.push(this.model.joined + ' joined the group');
+            }
+
+            this.$el.text(messages.join(' '));
+
+            return this;
+        }
+    });
+
+})();

js/views/message_view.js

@@ -61,7 +61,13 @@
     initialize: function() {
       this.$el.addClass(this.model.get('type'));
 
-      this.template = $('#message').html();
+      if (this.model.get('group_update')) {
+          this.group_update_view = new Whisper.GroupUpdateView({
+              model: this.model.get('group_update')
+          }).render();
+      } else {
+        this.template = $('#message').html();
+      }
       Mustache.parse(this.template);
 
       this.listenTo(this.model, 'change',  this.render); // auto update
@@ -70,32 +76,36 @@
     },
 
     render: function() {
-        this.$el.html(
-          Mustache.render(this.template, {
-            message: this.model.get('body'),
-            timestamp: moment(this.model.get('received_at')).fromNow(),
-            bubble_class: this.model.get('type') === 'outgoing' ? 'sent' : 'incoming',
-            sender: this.model.get('source')
-          })
-        );
-
-        this.$el.find('.attachments').append(
-            this.model.get('attachments').map(function(attachment) {
-                return new AttachmentView({model: attachment}).render().el;
-            })
-        );
-
-        if (this.model.get('delivered')) {
-            this.$el.addClass('delivered');
-        }
+        if (this.group_update_view) {
+            this.$el.append(this.group_update_view.$el);
+        } else {
+            this.$el.html(
+                Mustache.render(this.template, {
+                    message: this.model.get('body'),
+                    timestamp: moment(this.model.get('received_at')).fromNow(),
+                    bubble_class: this.model.get('type') === 'outgoing' ? 'sent' : 'incoming',
+                    sender: this.model.get('source')
+                })
+            );
 
-        var errors = this.model.get('errors');
-        if (errors && errors.length) {
-            this.$el.find('.message').append(
-                errors.map(function(error) {
-                    return new ErrorView({model: error}).render().el;
+            this.$el.find('.attachments').append(
+                this.model.get('attachments').map(function(attachment) {
+                    return new AttachmentView({model: attachment}).render().el;
                 })
             );
+
+            if (this.model.get('delivered')) {
+                this.$el.addClass('delivered');
+            }
+
+            var errors = this.model.get('errors');
+            if (errors && errors.length) {
+                this.$el.find('.message').append(
+                    errors.map(function(error) {
+                        return new ErrorView({model: error}).render().el;
+                    })
+                );
+            }
         }
 
         return this;

test/index.html

@@ -149,6 +149,7 @@
 
   <script type="text/javascript" src="../js/views/notifications.js"></script>
   <script type="text/javascript" src="../js/views/list_view.js" data-cover></script>
+  <script type="text/javascript" src="../js/views/group_update_view.js"></script>
   <script type="text/javascript" src="../js/views/message_view.js" data-cover></script>
   <script type="text/javascript" src="../js/views/message_list_view.js" data-cover></script>
   <script type="text/javascript" src="../js/views/conversation_list_item_view.js" data-cover></script>
@@ -164,6 +165,7 @@
   <script type="text/javascript" src="nativeclient_test.js"></script>
   <script type="text/javascript" src="curve25519_compiled_test.js"></script>
   <script type="text/javascript" src="helpers_test.js"></script>
+  <script type="text/javascript" src="views/group_update_view_test.js"></script>
   <script type="text/javascript" src="views/message_view_test.js"></script>
   <script type="text/javascript" src="views/list_view_test.js"></script>
   <script type="text/javascript" src="views/message_list_view_test.js"></script>

test/views/group_update_view_test.js

@@ -0,0 +1,16 @@
+describe('GroupUpdateView', function() {
+  it('should show new group members', function() {
+    var view = new Whisper.GroupUpdateView({model: {joined: ['Alice', 'Bob']}}).render();
+    assert.match(view.$el.text(), /Alice.*Bob.*joined the group/);
+  });
+
+  it('should note updates to the title', function() {
+    var view = new Whisper.GroupUpdateView({model: {name: 'New name'}}).render();
+    assert.match(view.$el.text(), /Title is now 'New name'/);
+  });
+
+  it('should say "Updated the group"', function() {
+    var view = new Whisper.GroupUpdateView({model: {avatar: 'New avatar'}}).render();
+    assert.match(view.$el.text(), /Updated the group/);
+  });
+});