snipe-it/resources/less/spacing.less

/*
 * Helpers: Spacing
 * Universal minor spacing classes to help space things out without
 * use-dedicated classes
 * -----------------
 */

@props: margin m, padding p;
@spacers: xs 5px 10px,
          sm 10px 20px,
          md 20px 30px;

.loop-props(@prop-index) when (@prop-index > 0){
  @prop: extract(@props, @prop-index);
  @prop-name: extract(@prop, 1);
  @abbrev: extract(@prop, 2);

  .loop-sizes(@prop-name; @abbrev; length(@spacers));

  .loop-props(@prop-index - 1);
}

.loop-props(length(@props)) !important;

.loop-sizes(@prop-name; @abbrev; @size-index) when (@size-index > 0){
  @spacer: extract(@spacers, @size-index);
  @size: extract(@spacer, 1);
  @x: extract(@spacer, 2);
  @y: extract(@spacer, 3);

  .@{abbrev}-a-@{size} {
    @{prop-name}: @y @x;
  }
  .@{abbrev}-t-@{size} {
    @{prop-name}-top: @y;
  }
  .@{abbrev}-r-@{size} {
    @{prop-name}-right: @x;
  }
  .@{abbrev}-b-@{size} {
    @{prop-name}-bottom: @y;
  }
  .@{abbrev}-l-@{size} {
    @{prop-name}-left: @x;
  }
  .@{abbrev}-x-@{size} {
    @{prop-name}-right: @x;
    @{prop-name}-left: @x;
  }
  .@{abbrev}-y-@{size} {
    @{prop-name}-top: @y;
    @{prop-name}-bottom: @y;
  }

  .loop-sizes(@prop-name; @abbrev; @size-index - 1);
}