require 'compass'
require 'sass'

module Sass::Script::Functions
  def ie_rgba(color)
    assert_type color, :Color

    red, green, blue = color.rgb.map { |num| num.to_s(16).rjust(2, '0') }
    alpha = (color.alpha * 255).round.to_s(16).rjust(2, '0')
    Sass::Script::String.new("##{alpha}#{red}#{green}#{blue}")
  end
end