// Returns a blank string if smallest breakpoint, otherwise returns the name with a dash in front.
// Useful for making responsive utilities.
//
//    >> breakpoint-infix(xs, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    ""  (Returns a blank string)
//    >> breakpoint-infix(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    "-sm"
@function breakpoint-infix($name, $breakpoints: $grid-breakpoints) {
    @return if(breakpoint-min($name, $breakpoints) == null, "", "_#{$name}");
}

// Framework grid generation
//
// Used only by Bootstrap to generate the correct number of grid classes given
// any value of `$grid-columns`.

@mixin make-grid-columns-bem($columns: $grid-columns, $gutter: $grid-gutter-width, $breakpoints: $grid-breakpoints) {
    // Common properties for all breakpoints
    %grid-column {
        position: relative;
        width: 100%;
        min-height: 1px; // Prevent columns from collapsing when empty
        padding-right: ($gutter / 2);
        padding-left: ($gutter / 2);
    }

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

        // Allow columns to stretch full width below their breakpoints
        @for $i from 1 through $columns {
            .bs-col#{$infix}_#{$i} {
                @extend %grid-column;
            }
        }
        .bs-col#{$infix},
        .bs-col#{$infix}_auto {
            @extend %grid-column;
        }

        @include media-breakpoint-up($breakpoint, $breakpoints) {
            // Provide basic `.col-{bp}` classes for equal-width flexbox columns
            .bs-col#{$infix} {
                flex-basis: 0;
                flex-grow: 1;
                max-width: 100%;
            }
            .bs-col#{$infix}_auto {
                flex: 0 0 auto;
                width: auto;
                max-width: none; // Reset earlier grid tiers
            }

            @for $i from 1 through $columns {
                .bs-col#{$infix}_#{$i} {
                    @include make-col($i, $columns);
                }
            }

            .bs-order#{$infix}_first { order: -1; }

            .bs-order#{$infix}_last { order: $columns + 1; }

            @for $i from 0 through $columns {
                .bs-order#{$infix}_#{$i} { order: $i; }
            }

            // `$columns - 1` because offsetting by the width of an entire row isn't possible
            @for $i from 0 through ($columns - 1) {
                @if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
                    .bs-offset#{$infix}_#{$i} {
                        @include make-col-offset($i, $columns);
                    }
                }
            }
        }
    }
}