digicolor.rb

#!/usr/bin/env ruby
require 'digiusb'

usage = "Usage: digicolor light_number #hex_color"

raise usage unless ARGV[1]

idx = ARGV[0].to_i

hex = ARGV[1]
raise usage if hex[0] != "#"
rgb = hex[1..-1].scan(/../).map {|str| str.hex}

light = DigiUSB.sparks[idx]
raise "There are only #{DigiUSB.sparks.length} lights" unless light

light.putc(115) # start character
light.putc(rgb[0]) # red value
light.putc(rgb[1]) # green value
light.putc(rgb[2]) # blue value