tningjs/sam-and-his-friends

// breakpoints.scss v1.0 | @ajlkn | MIT licensed */

// Vars.

/// Breakpoints.
/// @var {list}
$breakpoints: () !global;

// Mixins.

/// Sets breakpoints.
/// @param {map} $x Breakpoints.
@mixin breakpoints($x: ()) {
  $breakpoints: $x !global;
}

/// Wraps @content in a @media block targeting a specific orientation.
/// @param {string} $orientation Orientation.
@mixin orientation($orientation) {
  @media screen and (orientation: #{$orientation}) {
    @content;
  }
}

/// Wraps @content in a @media block using a given query.
/// @param {string} $query Query.
@mixin breakpoint($query: null) {
  $breakpoint: null;
  $op: null;
  $media: null;

  // Determine operator, breakpoint.

  // Greater than or equal.
  @if (str-slice($query, 0, 2) == '>=') {
    $op: 'gte';
    $breakpoint: str-slice($query, 3);
  }

  // Less than or equal.
  @elseif (str-slice($query, 0, 2) == '<=') {
    $op: 'lte';
    $breakpoint: str-slice($query, 3);
  }

  // Greater than.
  @elseif (str-slice($query, 0, 1) == '>') {
    $op: 'gt';
    $breakpoint: str-slice($query, 2);
  }

  // Less than.
  @elseif (str-slice($query, 0, 1) == '<') {
    $op: 'lt';
    $breakpoint: str-slice($query, 2);
  }

  // Not.
  @elseif (str-slice($query, 0, 1) == '!') {
    $op: 'not';
    $breakpoint: str-slice($query, 2);
  }

  // Equal.
  @else {
    $op: 'eq';
    $breakpoint: $query;
  }

  // Build media.
  @if ($breakpoint and map-has-key($breakpoints, $breakpoint)) {
    $a: map-get($breakpoints, $breakpoint);

    // Range.
    @if (type-of($a) == 'list') {
      $x: nth($a, 1);
      $y: nth($a, 2);

      // Max only.
      @if ($x == null) {
        // Greater than or equal (>= 0 / anything)
        @if ($op == 'gte') {
          $media: 'screen';
        }

        // Less than or equal (<= y)
        @elseif ($op == 'lte') {
          $media: 'screen and (max-width: ' + $y + ')';
        }

        // Greater than (> y)
        @elseif ($op == 'gt') {
          $media: 'screen and (min-width: ' + ($y + 1) + ')';
        }

        // Less than (< 0 / invalid)
        @elseif ($op == 'lt') {
          $media: 'screen and (max-width: -1px)';
        }

        // Not (> y)
        @elseif ($op == 'not') {
          $media: 'screen and (min-width: ' + ($y + 1) + ')';
        }

        // Equal (<= y)
        @else {
          $media: 'screen and (max-width: ' + $y + ')';
        }
      }

      // Min only.
      @else if ($y == null) {
        // Greater than or equal (>= x)
        @if ($op == 'gte') {
          $media: 'screen and (min-width: ' + $x + ')';
        }

        // Less than or equal (<= inf / anything)
        @elseif ($op == 'lte') {
          $media: 'screen';
        }

        // Greater than (> inf / invalid)
        @elseif ($op == 'gt') {
          $media: 'screen and (max-width: -1px)';
        }

        // Less than (< x)
        @elseif ($op == 'lt') {
          $media: 'screen and (max-width: ' + ($x - 1) + ')';
        }

        // Not (< x)
        @elseif ($op == 'not') {
          $media: 'screen and (max-width: ' + ($x - 1) + ')';
        }

        // Equal (>= x)
        @else {
          $media: 'screen and (min-width: ' + $x + ')';
        }
      }

      // Min and max.
      @else {
        // Greater than or equal (>= x)
        @if ($op == 'gte') {
          $media: 'screen and (min-width: ' + $x + ')';
        }

        // Less than or equal (<= y)
        @elseif ($op == 'lte') {
          $media: 'screen and (max-width: ' + $y + ')';
        }

        // Greater than (> y)
        @elseif ($op == 'gt') {
          $media: 'screen and (min-width: ' + ($y + 1) + ')';
        }

        // Less than (< x)
        @elseif ($op == 'lt') {
          $media: 'screen and (max-width: ' + ($x - 1) + ')';
        }

        // Not (< x and > y)
        @elseif ($op == 'not') {
          $media: 'screen and (max-width: ' + ($x - 1) +
            '), screen and (min-width: ' + ($y + 1) + ')';
        }

        // Equal (>= x and <= y)
        @else {
          $media: 'screen and (min-width: ' +
            $x +
            ') and (max-width: ' +
            $y +
            ')';
        }
      }
    }

    // String.
    @else {
      // Missing a media type? Prefix with "screen".
      @if (str-slice($a, 0, 1) == '(') {
        $media: 'screen and ' + $a;
      }

      // Otherwise, use as-is.
      @else {
        $media: $a;
      }
    }
  }

  // Output.
  @media #{$media} {
    @content;
  }
}