Write Rails helper method with any template engine

application_helper.rb

module ApplicationHelper
  def self.define_with_template(helper_name, template_type, template, locals = [])
    compiled = Tilt[template_type].new(nil) { template }
    define_method(helper_name) do|*args, &block|
      compiled.render(self, Hash[*locals.zip(args).flatten], &block).html_safe
    end
  end

  define_with_template :render_user_name, :slim, <<-SLIM, [:user_name]
.user
  marquee
    strong = user_name
  SLIM
end