FEATURE: allow plugins to overwrite handlebars templates

app/assets/javascripts/application.js.erb

@@ -1,8 +1,9 @@
 <%
+
 require_asset ("./main_include.js")
 
-# Include plugin javascripts
-DiscoursePluginRegistry.javascripts.each do |js|
-  require_asset(js)
-end
+# Include plugin javascripts/handlebars templates
+DiscoursePluginRegistry.javascripts.each { |js| require_asset(js) }
+DiscoursePluginRegistry.handlebars.each { |hb| require_asset(hb) }
+
 %>

app/assets/javascripts/discourse/ember/resolver.js

@@ -16,7 +16,15 @@ Discourse.Resolver = Ember.DefaultResolver.extend({
     @returns {Template} the template (if found)
   **/
   resolveTemplate: function(parsedName) {
-    return this.findMobileTemplate(parsedName) || this.findTemplate(parsedName) || Ember.TEMPLATES.not_found;
+    return this.findPluginTemplate(parsedName) ||
+           this.findMobileTemplate(parsedName) ||
+           this.findTemplate(parsedName) ||
+           Ember.TEMPLATES.not_found;
+  },
+
+  findPluginTemplate: function(parsedName) {
+    var pluginParsedName = this.parseName(parsedName.fullName.replace("template:", "template:javascripts/"));
+    return this.findTemplate(pluginParsedName);
   },
 
   findMobileTemplate: function(parsedName) {

app/assets/javascripts/main_include.js

@@ -36,3 +36,4 @@
 //= require_tree ./discourse/templates
 //= require_tree ./discourse/routes
 //= require_tree ./discourse/initializers
+

lib/discourse_plugin_registry.rb

@@ -7,6 +7,7 @@ class DiscoursePluginRegistry
     attr_accessor :javascripts
     attr_accessor :server_side_javascripts
     attr_accessor :stylesheets
+    attr_accessor :handlebars
 
     # Default accessor values
     def javascripts
@@ -20,6 +21,10 @@ class DiscoursePluginRegistry
     def stylesheets
       @stylesheets ||= Set.new
     end
+
+    def handlebars
+      @handlebars ||= Set.new
+    end
   end
 
   def register_js(filename, options={})
@@ -48,10 +53,15 @@ class DiscoursePluginRegistry
     self.class.stylesheets
   end
 
+  def handlebars
+    self.class.handlebars
+  end
+
   def self.clear
     self.javascripts = nil
     self.server_side_javascripts = nil
     self.stylesheets = nil
+    self.handlebars = nil
   end
 
   def self.setup(plugin_class)

lib/plugin/instance.rb

@@ -93,7 +93,6 @@ class Plugin::Instance
     @javascripts << js
   end
 
-
   def register_asset(file,opts=nil)
     full_path = File.dirname(path) << "/assets/" << file
     assets << full_path
@@ -154,10 +153,12 @@ class Plugin::Instance
     end
     unless assets.blank?
       assets.each do |asset|
-        if asset =~ /\.js$|.js.erb$/
+        if asset =~ /\.js$|\.js\.erb$/
           DiscoursePluginRegistry.javascripts << asset
         elsif asset =~ /\.css$|\.scss$/
           DiscoursePluginRegistry.stylesheets << asset
+        elsif asset =~ /\.js\.handlebars$$/
+          DiscoursePluginRegistry.handlebars << asset
         end
       end
 

test/javascripts/ember/resolver_test.js

@@ -95,6 +95,19 @@ test("resolves mobile templates to 'mobile/' namespace", function() {
   lookup("template:baz", "baz", "falling back to a normal version when mobile version is not present");
 });
 
+test("resolves plugin templates to 'javascripts/' namespace", function() {
+  setTemplates([
+    "javascripts/foo",
+    "bar",
+    "javascripts/bar",
+    "baz"
+  ]);
+
+  lookup("template:foo", "javascripts/foo", "finding plugin version even if normal one is not present");
+  lookup("template:bar", "javascripts/bar", "preferring plugin version when both versions are present");
+  lookup("template:baz", "baz", "falling back to a normal version when plugin version is not present");
+});
+
 test("resolves templates with 'admin' prefix to 'admin/templates/' namespace", function() {
   setTemplates([
     "admin/templates/foo",