Tried out Shoes

terry October 14, 2008

Tags: , , , ,

I got bored tonight and wanted to write a little script to calculate the amount of time left in my propane tank. Instead of just doing it in Ruby (or Numbers, for that matter), I figured I’d play with Shoes a little. Then I got bored, and really just spat it out and am done with it.

Anyways, for those curious or who want to calculate the time left in their propane tank, here’s the code:

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PROPANE_GALLON_WEIGHT = 4.23
BTUS_PER_GALLON = 91_690
 
Shoes.app do
  stack do
    para "Let's figure out how much time you have left in your tank."
    para "Tare weight?"
    @tare_weight = edit_line
    para "Weight?"
    @weight = edit_line
    para "BTUs per hour?"
    @btus_per_hour = edit_line
    button "Calculate!" do
      propane_weight = @weight.text.to_i - @tare_weight.text.to_i
      gallons_of_propane = propane_weight / PROPANE_GALLON_WEIGHT
      btus = gallons_of_propane * BTUS_PER_GALLON
      hours_remaining = btus / @btus_per_hour.text.to_i
      alert("Hours remaining: #{hours_remaining}")
    end
  end
end

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