module AbsoluteUrlHelper
  def abs_url( input, dir )
    return input unless SITE.base
    return SITE.base + input if input[0,1] == '/'

    rgxp = %r/(src|href)="([^"]*)"/

    input.gsub!(rgxp) do
      path = $2
      path = URI.join(SITE.base, "/#{dir}/" ,path)
      %Q(#{$1}="#{path}")
    end

    return input
  end
end

Webby::Helpers.register(AbsoluteUrlHelper)