gistfile1.sass

  @for $i from 1 through $shadows-count {

    $shadow: nth($shadows, $i);
    $color: nth($shadow, 1);
    $count: nth($shadow, 2);

    @for $i from  $currentwidth to ($currentwidth + $count) {
      $x: $x + $x-delta;
      $y: $y + $y-delta;

      $output: $output + '#{$color} #{$x}px #{$y}px 1px';

      @if($i < $total - 1) {
        $output: $output + ', ';
      }
    }

    $currentwidth: $currentwidth + $count;
  }