add basic pub/sub functionality to WidgetCollection

public/javascripts/diaspora.js

@@ -13,6 +13,7 @@
   Diaspora.WidgetCollection = function() {
     this.initialized = false;
     this.collection = { };
+    this.eventsContainer = $({});
   };
 
   Diaspora.WidgetCollection.prototype.add = function(widgetId, widget) {
@@ -36,6 +37,14 @@
     }
   };
 
+  Diaspora.WidgetCollection.prototype.subscribe = function(id, callback) {
+    this.eventsContainer.bind(id, callback);
+  };
+
+  Diaspora.WidgetCollection.prototype.publish = function(id) {
+    this.eventsContainer.trigger(id);
+  };
+
   Diaspora.widgets = new Diaspora.WidgetCollection();
   
   window.Diaspora = Diaspora;

spec/javascripts/diaspora-spec.js

@@ -51,6 +51,28 @@ describe("Diaspora", function() {
           expect(widgets.initialized).toBeTruthy();
         });
       });
+
+      describe("subscribe", function() {
+        it("subscribes to an event specified by an id", function() {
+          expect(widgets.eventsContainer.data("events")).not.toBeDefined();
+          widgets.subscribe("testing/event", function() { });
+          expect(widgets.eventsContainer.data("events")["testing/event"]).toBeDefined();
+        });
+      });
+
+      describe("publish", function() {
+        it("triggers events that are related to the specified id", function() {
+          var called = false;
+
+          widgets.subscribe("testing/event", function() {
+            called = true;
+          });
+
+          widgets.publish("testing/event");
+
+          expect(called).toBeTruthy();
+        });
+      });
     });
   });
 });