Mixin that puts position offset values on one line a la padding or margin

gistfile1.sass

@mixin positions($top:"auto", $right:"auto", $bottom:"auto", $left:"auto",$unit:"") {
  @if ( $top != "auto" and ( $unit == "" or $unit == "rem" ) ) {
    top: $top * $base-font-multiplier * 16px;
    top: $top * 1rem;
  } @else if ( $unit != "" and $unit != "rem" ) {
    top: #{$top}#{$unit};
  } @else {
    top: $top;
  }
  @if ( $right != "auto" and ( $unit == "" or $unit == "rem" ) ) {
    right: $right * $base-font-multiplier * 16px;
    right: $right * 1rem;
  } @else if ( $unit != "" and $unit != "rem" ) {
    right: #{$right}#{$unit};
  } @else {
    right: $right;
  }
  @if ( $bottom != "auto" and ( $unit == "" or $unit == "rem" ) ) {
    bottom: $bottom * $base-font-multiplier * 16px;
    bottom: $bottom * 1rem;
  } @else if ( $unit != "" and $unit != "rem" ) {
    bottom: #{$bottom}#{$unit};
  } @else {
    bottom: $bottom;
  }
  @if ( $left != "auto" and ( $unit == "" or $unit == "rem" ) ) {
    left: $left * $base-font-multiplier * 16px;
    left: $left * 1rem;
  } @else if ( $unit != "" and $unit != "rem" ) {
    left: #{$left}#{$unit};
  } @else {
    left: $left;
  }
}