Add support for deleting a conversation

Note that the conversation record is not actually destroyed,
merely marked inactive, preserving the contact name, photo,
etc...

index.html

@@ -50,6 +50,7 @@
                         <li>by <a href="http://whispersystems.org">Open Whisper Systems</a></li>
                         <li><a href="http://support.whispersystems.org/">Need Help?</a></li>
                     </ul>
+                    <button class='destroy'>Delete this conversation</button>
                 </div>
             </div>
         </script>

js/models/conversations.js

@@ -89,6 +89,13 @@
         options = options || {};
         options.conditions = {conversationId: this.id };
         return this.messageCollection.fetch(options);
+    },
+
+    destroyMessages: function() {
+        var models = this.messageCollection.models;
+        this.messageCollection.reset([]);
+        _.each(models, function(message) { message.destroy(); });
+        return this.save({active: false});
     }
   });
 

js/views/conversation_view.js

@@ -39,7 +39,17 @@
 
         events: {
             'submit .send': 'sendMessage',
-            'close': 'remove'
+            'close': 'remove',
+            'click .destroy': 'destroyMessages'
+        },
+
+        destroyMessages: function(e) {
+            if (confirm("Permanently delete this conversation?")) {
+                this.model.destroyMessages();
+                this.model.collection.remove(this.model);
+                this.remove();
+                this.model.trigger('destroy');
+            }
         },
 
         sendMessage: function(e) {

js/views/inbox_view.js

@@ -33,6 +33,10 @@
             });
 
             this.conversations.fetch({ reset: true }).then(function() {
+                this.conversations.reset(
+                    //TODO: Add an index to support this operation at the db level
+                    this.conversations.filter(function(c) { return c.get('active'); })
+                );
                 if (this.conversations.length) {
                     this.conversations.at(0).trigger('render');
                 }