Generate javascripts in engine with --mountable option

railties/lib/rails/generators/app_base.rb

@@ -171,6 +171,12 @@ def bundle_if_dev_or_edge
       def dev_or_edge?
         options.dev? || options.edge?
       end
+
+      def empty_directory_with_gitkeep(destination, config = {})
+        empty_directory(destination, config)
+        create_file("#{destination}/.gitkeep") unless options[:skip_git]
+      end
+
     end
   end
 end

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -317,11 +317,6 @@ def mysql_socket
         ].find { |f| File.exist?(f) } unless RbConfig::CONFIG['host_os'] =~ /mswin|mingw/
       end
 
-      def empty_directory_with_gitkeep(destination, config = {})
-        empty_directory(destination, config)
-        create_file("#{destination}/.gitkeep") unless options[:skip_git]
-      end
-
       def get_builder_class
         defined?(::AppBuilder) ? ::AppBuilder : Rails::AppBuilder
       end

railties/lib/rails/generators/rails/plugin_new/plugin_new_generator.rb

@@ -88,6 +88,29 @@ def test_dummy_clean
       end
     end
 
+    def stylesheets
+      empty_directory_with_gitkeep "public/stylesheets" if options[:mountable]
+    end
+
+    def javascripts
+      return unless options[:mountable]
+
+      empty_directory "#{app_templates_dir}/public/javascripts"
+
+      unless options[:skip_javascript]
+        copy_file "#{app_templates_dir}/public/javascripts/#{options[:javascript]}.js", "public/javascripts/#{options[:javascript]}.js"
+        copy_file "#{app_templates_dir}/public/javascripts/#{options[:javascript]}_ujs.js", "public/javascripts/rails.js"
+
+        if options[:prototype]
+          copy_file "#{app_templates_dir}/public/javascripts/controls.js", "public/javascripts/controls.js"
+          copy_file "#{app_templates_dir}/public/javascripts/dragdrop.js", "public/javascripts/dragdrop.js"
+          copy_file "#{app_templates_dir}/public/javascripts/effects.js", "public/javascripts/effects.js"
+        end
+      end
+
+      copy_file "#{app_templates_dir}/public/javascripts/application.js", "public/javascripts/application.js"
+    end
+
     def script(force = false)
       directory "script", :force => force do |content|
         "#{shebang}\n" + content
@@ -143,6 +166,14 @@ def create_lib_files
         build(:lib)
       end
 
+      def create_public_stylesheets_files
+        build(:stylesheets)
+      end
+
+      def create_javascript_files
+        build(:javascripts)
+      end
+
       def create_script_files
         build(:script)
       end
@@ -163,6 +194,10 @@ def finish_template
       public_task :apply_rails_template, :bundle_if_dev_or_edge
 
     protected
+      def app_templates_dir
+        "../../app/templates"
+      end
+
       def create_dummy_app(path = nil)
         dummy_path(path) if path
 

railties/test/generators/plugin_new_generator_test.rb

@@ -91,6 +91,35 @@ def test_ensure_that_database_option_is_passed_to_app_generator
     assert_file "test/dummy/config/database.yml", /postgres/
   end
 
+  def test_skipping_javascripts_without_mountable_option
+    run_generator
+    assert_no_file "public/javascripts/prototype.js"
+    assert_no_file "public/javascripts/rails.js"
+    assert_no_file "public/javascripts/controls.js"
+    assert_no_file "public/javascripts/dragdrop.js"
+    assert_no_file "public/javascripts/dragdrop.js"
+    assert_no_file "public/javascripts/application.js"
+  end
+
+  def test_javascripts_generation
+    run_generator [destination_root, "--mountable"]
+    assert_file "public/javascripts/rails.js"
+    assert_file "public/javascripts/prototype.js"
+    assert_file "public/javascripts/controls.js"
+    assert_file "public/javascripts/dragdrop.js"
+    assert_file "public/javascripts/dragdrop.js"
+    assert_file "public/javascripts/application.js"
+  end
+
+  def test_skip_javascripts
+    run_generator [destination_root, "--skip-javascript", "--mountable"]
+    assert_no_file "public/javascripts/prototype.js"
+    assert_no_file "public/javascripts/rails.js"
+    assert_no_file "public/javascripts/controls.js"
+    assert_no_file "public/javascripts/dragdrop.js"
+    assert_no_file "public/javascripts/dragdrop.js"
+  end
+
   def test_ensure_that_javascript_option_is_passed_to_app_generator
     run_generator [destination_root, "--javascript", "jquery"]
     assert_file "test/dummy/public/javascripts/jquery.js"