Command Line utility for setting the background colour of the OSX terminal

gistfile1.rb

#!/usr/bin/env ruby

if ARGV.length != 1
  puts "Usage:"
  puts "    colour red"
  puts "or"
  puts "    colour '#00ffaa'  # NOTE THE QUOTES"
  puts "or"
  puts "    colour rgb(255,0,0)"
  exit
end

STANDARD_COLOURS = {
  'white' =>   '#FFFFFF',
  'silver' =>  '#C0C0C0',
  'gray' =>    '#808080',
  'black' =>   '#000000',
  'red' =>     '#FF0000',
  'maroon' =>  '#800000',
  'yellow' =>  '#FFFF00',
  'olive' =>   '#808000',
  'lime' =>    '#00FF00',
  'green' => 	 '#008000',
  'aqua' => 	 '#00FFFF',
  'teal' => 	 '#008080',
  'blue' => 	 '#0000FF',
  'navy' => 	 '#000080',
  'fuchsia' => '#FF00FF',
  'purple' =>  '#800080'
}

def hex_to_16_bit_rgb(hex)
  _, r, g, b = hex.match(/^#(\w\w)(\w\w)(\w\w)$/).to_a
  rgb_to_16_bit_rgb(r.hex, g.hex, b.hex)
end

def rgb_to_16_bit_rgb(r, g, b)
  [r << 8, g << 8, b << 8].join(',')
end

colour_string = ARGV[0]

colour = case colour_string
when /^\#/ then hex_to_16_bit_rgb(colour_string)
when /rgb\((\d+),(\d+),(\d+)\)/ then rgb_to_16_bit_rgb($1, $2, $3)
when /^\w+$/ then hex_to_16_bit_rgb(STANDARD_COLOURS[colour_string]) if STANDARD_COLOURS[colour_string]
end

if !colour
  puts "I don't recognize #{colour_string.inspect}"
  exit
end

puts "Setting the background colour to #{colour} (16 bit rgb)"

command = """
  osascript -e 'tell application \"Terminal\"
    set targetWindow to window 1
    set background color of targetWindow to {#{colour}}
    # set cursor color of targetWindow to TODO
    # set normal text color of targetWindow to TODO
    # set bold text color of targetWindow to TODO
    end tell'
"""

`#{command}`