instance method assets_gemfile_entry

# File railties/lib/rails/generators/app_base.rb, line 203
      def assets_gemfile_entry
        return if options[:skip_sprockets]
        gemfile = <<-GEMFILE.strip_heredoc
          # Gems used only for assets and not required
          # in production environments by default.
          group :assets do
            gem 'sass-rails', #{options.dev? || options.edge? ? "  :git => 'git://github.com/rails/sass-rails.git', :branch => '3-1-stable'" : "  '~> 3.1.5'"}
            gem 'coffee-rails', #{options.dev? || options.edge? ? ":git => 'git://github.com/rails/coffee-rails.git', :branch => '3-1-stable'" : "'~> 3.1.1'"}

            # See https://github.com/sstephenson/execjs#readme for more supported runtimes
            #{javascript_runtime_gemfile_entry}
            gem 'uglifier', '>= 1.0.3'
          end
        GEMFILE

        gemfile.strip_heredoc.gsub(/^[ \t]*$/, '')
      end