// --------------------------------------------------------
// margin/padding utilities
// Generates spacing classes that look like this:
// .u-[m|p][|x|y|t|r|b|l][0|1|2|3|4|5|6|7|8]
//
// m = margin
// p = padding
// x = left and right
// y = top and bottom
// t, r, b, l = top left bottom right
// number = 0-8
// --------------------------------------------------------
$increment-size: 0.5rem;
$increments: 8;

@function calculate-value($increment) {
  // Returns a unitless zero value ('0' instead of '0rem')
  @return if($increment == 0, 0, $increment * $increment-size);
}

@each $type in margin, padding {
  $type-short: str-slice($type, 1, 1);

  @for $i from 0 through $increments {
    .u-#{$type-short}#{$i} {
      #{$type}: calculate-value($i);
    }

    .u-#{$type-short}y#{$i} {
      #{$type}-top: calculate-value($i);
      #{$type}-bottom: calculate-value($i);
    }

    .u-#{$type-short}x#{$i} {
      #{$type}-left: calculate-value($i);
      #{$type}-right: calculate-value($i);
    }

    @each $side in top, right, bottom, left {
      $side-short: str-slice($side, 1, 1);

      .u-#{$type-short}#{$side-short}#{$i} {
        #{$type}-#{$side}: calculate-value($i);
      }
    }
  }
}