Make rendered callback sort of work

packages/blaze/component.js

@@ -67,7 +67,10 @@ Blaze.Component = Blaze.Controller.extend({
       return self.render();
     });
     range.onstop(function () {
-      self.finalize();
+      if (! self.isFinalized) {
+        self.isFinalized = true;
+        self.finalize();
+      }
     });
     return range;
   },

packages/blaze/domrange.js

@@ -1,3 +1,4 @@
+
 // A constant empty array (frozen if the JS engine supports it).
 var _emptyArray = Object.freeze ? Object.freeze([]) : [];
 
@@ -286,19 +287,18 @@ _.extend(Blaze.DOMRange.prototype, {
   }
 });
 
-Blaze.DOMAugmenter = function () {};
+Blaze.DOMAugmenter = JSClass.create();
 _.extend(Blaze.DOMAugmenter, {
   attach: function (range, element) {},
   // arguments are same as were passed to `attach`
   detach: function (range, element) {}
 });
 
-Blaze.EventAugmenter = function (eventMap) {
-  this.eventMap = eventMap;
-  this.handles = [];
-};
-Blaze.EventAugmenter.prototype = new Blaze.DOMAugmenter;
-_.extend(Blaze.EventAugmenter.prototype, {
+Blaze.EventAugmenter = Blaze.DOMAugmenter.extend({
+  constructor: function (eventMap) {
+    this.eventMap = eventMap;
+    this.handles = [];
+  },
   attach: function (range, element) {
     var self = this;
     var eventMap = self.eventMap;

packages/ui/newblaze.js

@@ -11,6 +11,28 @@ _.extend(UI.body2, {
   }
 });
 
+if (Meteor.isClient) {
+  UI.TemplateRenderedAugmenter = Blaze.DOMAugmenter.extend({
+    constructor: function () {
+      this.fired = false;
+    },
+    attach: function (range, element) {
+      if (! this.fired) {
+        this.fired = true; // only fire once
+        var tmpl = range.controller;
+        if (tmpl.rendered && ! tmpl.isFinalized) {
+          Deps.afterFlush(function () {
+            if (! tmpl.isFinalized) {
+              var templateInstance = {}; // XXX
+              tmpl.rendered.call(templateInstance);
+            }
+          });
+        }
+      }
+    }
+  });
+}
+
 UI.TemplateComponent = Blaze.Component.extend({
   constructor: function (dataFunc, contentFunc, elseFunc) {
     UI.TemplateComponent.__super__.constructor.call(this);
@@ -40,6 +62,9 @@ UI.TemplateComponent = Blaze.Component.extend({
         range.addDOMAugmenter(new Blaze.EventAugmenter(m));
       });
     }
+    if (this.rendered) {
+      range.addDOMAugmenter(new UI.TemplateRenderedAugmenter);
+    }
     return range;
   },
   events: function (eventMap) {