怎么用 shoes packer 来打包 shoes

源代码：

Shoes.app height: 150, width: 250 do
  background rgb(240, 250, 208)
  stack margin: 10 do
    button "Start" do
      @time = Time.now
      @label.replace "Stop watch started at #@time"
    end
    button "Stop" do
      @label.replace "Stopped, ", strong("#{Time.now - @time}"), " seconds elapsed."
    end
    @label = para "Press ", strong("start"), " to begin timing."
  end
end