taiste-sass.rb

require 'sass'

module Sass::Script::Functions
  def inline_image(image, type)
    path = image.value
    image_data = [data(path)].flatten.pack('m').gsub('\n', '')
    declaration = "url('data:#{type};base64,#{image_data}')"
    Sass::Script::String.new(declaration)
  end
  declare :inline_image, :args => [:string, :string]

  protected
  def data(path)
    File.open(path, "rb") {|io| io.read}
  end
end