A simple Ruby shell script to control LIFX (http://lifx.co) light bulbs.

light

#!/usr/bin/env ruby

require 'lifx'

if ARGV.length > 0
	# see if a specific lamp is addressed 
	label = /^on|off|0x[0-9a-f]{6}$/.match(ARGV[0]) ? nil : ARGV[0]

	# discover lamps and wait for label data to be available
	client = LIFX::Client.lan
	client.discover!
	sleep(0.3)

	# select either the specified light or all lights if none was specified
	light = label ? client.lights.with_label(label) : client.lights

	# transition duration in seconds
	duration = [4, ARGV[-1].to_i].max

	# value is either first or second argument, depending whether a label was provided
	value = label ? ARGV[1] : ARGV[0]

	if value == 'on'		
		light.turn_on!
		sleep(0.2)		
		light.set_color(LIFX::Color.rgb(255,255,255), duration: duration)
	elsif value == 'off' and light.on?
		light.set_color(LIFX::Color.rgb(0, 0, 0), duration: duration)
		sleep(duration)
		light.turn_off!
	elsif value[0,2] == '0x'
		r = value[2,2].hex
		g = value[4,2].hex
		b = value[6,2].hex

		if light.off?
			light.turn_on!
			sleep(0.2)
		end

		color = LIFX::Color.rgb(r, g, b)		
		light.set_color(color, duration: duration)		
	end

	# make sure all commands are send before the program exits
	client.flush
else
	print("usage: light [label] on|off|0xRRGGBB [duration=4]

examples:
  light on            -> turns all lights on
  light \"Kitchen\" off -> turns Kitchen light off
  light 0xff0000      -> turns all lights red
  light Bedroom on 30 -> turns up the light in the Bedroom over 30 seconds\n")
end