Playing around with a possible .jsbuilder template type for outputting json in sinatra

js_builder_template.rb

  class JsBuilderTemplate < Template
    def precompiled_preamble(locals)
      [ super, "begin" ].join("\n")
    end

    def precompiled_postamble(locals)
      "end.to_json"
    end

    def precompiled_template(locals)
      data.to_str
    end
  end
  Tilt.register 'jsbuilder', JsBuilderTemplate