android.moparisthebest.org/lib/colors.rb

class String
  # colorization
  def colorize(color_code)
    "\e[#{color_code}m#{self}\e[0m"
  end
  
  def black
    colorize(30)
  end
  
  def red
    colorize(31)
  end

  def green
    colorize(32)
  end

  def yellow
    colorize(33)
  end
  
  def blue
    colorize(34)
  end

  def magenta
    colorize(35)
  end
  
  def cyan
    colorize(36)
  end
  
  def white
    colorize(37)
  end
  
  def bold
    colorize(1)
  end
end