TextMate command for toggling CSS color format through hex, RGB and RGBA

toggle-color-format

#!/usr/bin/env ruby

class Color < Struct.new(:r, :g, :b, :a)
  def self.from_hex (str)
    args = case str.length
      when 3; str.scan(/[0-9a-f]/i).map{ |s| "#{s}#{s}".to_i(16) }
      when 6; str.scan(/[0-9a-f]{2}/i).map{ |s| s.to_i(16) }
      else [0, 0, 0]
    end << 1.0
    new(*args)
  end
  
  def self.from_rgb (str)
    new( *(str.split(',').map(&:to_i) << 1.0) )
  end
  
  def self.from_rgba (str)
    new(*(str.split(',')[0..2].map(&:to_i) << str.split(',')[-1].to_f))
  end
  
  def to_hex
    "##{"%02X" % r}#{"%02X" % g}#{"%02X" % b}"
  end

  def to_rgb
    "rgb(#{r}, #{g}, #{b})"
  end

  def to_rgba
    "rgba(#{r}, #{g}, #{b}, 1.0)"
  end
end

print case str = STDIN.read
  when /\A#([0-9a-f]{3,6})\z/i; Color.from_hex($1).to_rgb
  when /\Argb\(([0-9., ]+)\)\z/i; Color.from_rgb($1).to_rgba
  when /\Argba\(([0-9., ]+)\)\z/i; Color.from_rgba($1).to_hex
  else str
end