bootstrap/scss/layout/_grid.scss

@use "sass:map";
@use "../config" as *;
@use "breakpoints" as *;

// mdo-do
// - check gap utilities as replacement for gutter classes from v5

// Row
//
// Rows contain your columns.

:root {
  @each $name, $value in $grid-breakpoints {
    --#{$prefix}breakpoint-#{$name}: #{$value};
  }
}

.grid {
  --#{$prefix}columns: #{$grid-columns};
  --#{$prefix}rows: 1;
  --#{$prefix}gap: #{$grid-gutter-width};

  display: grid;
  grid-template-rows: repeat(var(--#{$prefix}rows), 1fr);
  grid-template-columns: repeat(var(--#{$prefix}columns), 1fr);
  gap: var(--#{$prefix}gap);
}

@each $breakpoint in map.keys($grid-breakpoints) {
  $infix: breakpoint-infix($breakpoint, $grid-breakpoints);

  @include media-breakpoint-up($breakpoint, $grid-breakpoints) {
    @if $grid-columns > 0 {
      @for $i from 1 through $grid-columns {
        .col#{$infix}-#{$i} {
          grid-column: auto / span $i;
        }

        .end#{$infix}-#{$i} {
          grid-column-end: $i;
        }
      }

      // Start with `1` because `0` is an invalid value.
      // Ends with `$columns - 1` because offsetting by the width of an entire row isn't possible.
      @for $i from 1 through ($grid-columns - 1) {
        .col-start#{$infix}-#{$i} {
          grid-column-start: $i;
        }
      }
    }
  }
}

// mdo-do: add to utilities?
.grid-cols-subgrid {
  grid-template-columns: subgrid;
}

.grid-fill {
  --#{$prefix}gap: #{$grid-gutter-width};

  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
  grid-auto-flow: row;
  gap: var(--#{$prefix}gap);
}

// mdo-do: add to utilities?
.g-col-auto {
  grid-column: auto/auto;
}

// mdo-do: add to utilities?
.grid-cols-3 {
  --#{$prefix}columns: 3;
}
.grid-cols-4 {
  --#{$prefix}columns: 4;
}
.grid-cols-6 {
  --#{$prefix}columns: 6;
}