// SCSS mixins // —————————————

// Global variables used in mixins.

// Number of breakpoints. $breakpoints-limit: length($breakpoints);

// List of rootsizes, breakpoints, and max-widths. $sizes: map-values($rootsizes); $points: map-values($breakpoints); $line-widths: map-values($measures); $max-widths: map-values($maxwidths);

// Breakpoints. Either set one to one of the breakpoint variables, or use a custom value for minor breakpoints. // Defaults to min-width, but both min->max and max-width are available too. // Parts based on gist.github.com/timknight/03e6335b8816aa534cf7 @mixin breakpoint($break: 0, $max: 0) {

// Type of break variable
$value: type-of($break);

// If it is a string (i.e. a breakpoint variable).
@if $value == string {
  // If using 'break-1', 'break-2' etc output the correct breakpoints from map.
  @if map-has-key($breakpoints, $break) {
    @media screen and (min-width: #{map-get($breakpoints, $break) / 16 * 1em} ) { @content; }
  } @else {
    @warn "#{$break} is not a set breakpoint variable";
  }

// If it is a number, use this for the breakpoint.
} @else if $value == number {
  // If using other numbers output value in ems either for min, min & max or max width breakpoints.
  $query: "all" !default;
  @if      $break != 0 and $max != 0 { $query: "(min-width: #{$break / 16 * 1em}) and (max-width: #{$max / 16 * 1em})"; }
  @else if $break != 0 and $max == 0 { $query: "(min-width: #{$break / 16 * 1em})"; }
  @else if $break == 0 and $max != 0 { $query: "(max-width: #{$max / 16 * 1em})"; }
  @media #{$query} { @content; }

} @else {
  @warn "#{$break} is not valid to use as a breakpoint";
}

}

// Root font-size in %, outputted in correct breakpoints. @mixin rootsize {

font-size: nth($sizes, 1) / 16 * 100%;

// Loop through breakpoints.
@for $i from 2 through $breakpoints-limit {
  @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
    font-size: nth($sizes, $i) / 16 * 100%;
  }
}

}

// Max-widths for typeset containers, outputted in correct breakpoints. @mixin maxwidth($breakpoint: 0) {

// Type of chosen variables.
$break-value: type-of($breakpoint);

// If specifying a breakpoint to use (and breakpoint exists).
@if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

  max-width: #{nth($max-widths, ($breakpoint + 1)) / nth($sizes, ($breakpoint + 1))}rem;

} @else if $breakpoint == all {
  max-width: #{nth($max-widths, 1) / nth($sizes, 1)}rem;

  // Loop through breakpoints.
  @for $i from 2 through $breakpoints-limit {
    @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
      max-width: #{nth($max-widths, $i) / nth($sizes, $i)}rem;
    }
  }
}

}

// Set the measure for single columns, outputted in correct breakpoints. @mixin measure($breakpoint: 0) {

// Type of chosen variables.
$break-value: type-of($breakpoint);

// If specifying a breakpoint to use (and breakpoint exists).
@if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

  max-width: #{nth($line-widths, ($breakpoint + 1)) / nth($sizes, ($breakpoint + 1))}rem;

} @else if $breakpoint == all {
  max-width: #{nth($line-widths, 1) / nth($sizes, 1)}rem;

  // Loop through breakpoints.
  @for $i from 2 through $breakpoints-limit {
    @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
      max-width: #{nth($line-widths, $i) / nth($sizes, $i)}rem;
    }
  }
}

}

// Calculate percentage width of container to get optimal measure for main text columns. // Defaults to all breakpoints. // Note: will not output for base breakpoint as this comes from the 'measure' mixin. @mixin ideal-measure($breakpoint: 0, $gutter: 0, $main: true, $output: max-width) {

// Type of chosen variables.
$break-value: type-of($breakpoint);

// If specifying a breakpoint to use (and breakpoint exists and is larger than 0).
@if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint > 0 {

  @if $gutter == small {
    $gutter: map-get($gutterwidths, small) * 2 / 1rem;
  } @else if $gutter == medium {
    $gutter: map-get($gutterwidths, medium) * 2 / 1rem;
  } @else if $gutter == large {
    $gutter: map-get($gutterwidths, large) * 2 / 1rem;
  } @else {
    $gutter: 0;
  }

  $rootsize: map-get($rootsizes, rootsize-#{$breakpoint});
  $ideal-measure: map-get($measures, measure-#{$breakpoint});
  $gutter-size: ($gutter * $rootsize);
  $container-width: map-get($maxwidths, width-#{$breakpoint});

  $percentage: percentage(($ideal-measure + $gutter-size) / $container-width);

  @if $percentage < 55 {
    $percentage: 55%;
  } @else if $percentage > 65 {
    $percentage: 65%;
  }

  @if $main == false {
    $percentage: 100 - $percentage;
  }

  #{$output}: $percentage;
}

}

// Value in scale in $modular-scale? // Used in following fontsize mixin. @function in-modular-scale($scale, $key) {

$map: map-get($modular-scale, $scale);
$output: map-has-key($map, $key);
@return $output;

}

// Font-size in rems. Either set per breakpoint or for all. // Use values as you would for pixels i.e. 16 or use values from the modular scale. @mixin fontsize($fontsize, $breakpoint: 0) {

// Type of chosen variables.
$font-value: type-of($fontsize);
$break-value: type-of($breakpoint);

// Check if value exists in scale.
$in-scale: in-modular-scale(scale-0, $fontsize);

// If specifying a breakpoint to use (and breakpoint exists).
@if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

  // If using a number for fontsize.
  @if $font-value == number {
    font-size: #{$fontsize / nth($sizes, ($breakpoint + 1))}rem;

  // If using a variable from the scale for fontsize.
  } @else if $in-scale == true {
    $get-scale: map-get($modular-scale, scale-#{$breakpoint});
    $get-size: map-get($get-scale, $fontsize);

    font-size: #{$get-size / nth($sizes, ($breakpoint + 1))}rem;

  } @else {
    @warn "#{$fontsize} is not a valid scale variable";
  }

// If want to use value for all breakpoints.
} @else if $breakpoint == all {

  // If using a number for fontsize.
  @if $font-value == number {
    font-size: #{$fontsize / nth($sizes, 1)}rem;

    // Loop through breakpoints.
    @for $i from 2 through $breakpoints-limit {
      @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
        font-size: #{$fontsize / nth($sizes, $i)}rem;
      }
    }

  // If using a variable from the scale for fontsize.
  } @else if $in-scale == true {
    $get-scale: map-get($modular-scale, scale-0);
    $get-size: map-get($get-scale, $fontsize);
    font-size: #{$get-size / nth($sizes, 1)}rem;

    // Loop through breakpoints.
    @for $i from 2 through $breakpoints-limit {
      $get-scale: map-get($modular-scale, scale-#{$i - 1});
      $get-size: map-get($get-scale, $fontsize);

      @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
        font-size: #{$get-size / nth($sizes, $i)}rem;
      }
    }

  } @else {
    @warn "#{$fontsize} is not a valid scale variable";
  }

} @else {
  @warn "#{$breakpoint} is not valid to use as a breakpoint";
}

}

// Advanced baseline magic. // ! Read the README to help understand what is going on here. // Parts based on gist.github.com/razwan/10662500 @mixin baseline($fontsize, $font, $lineheight: 2, $below: 2, $breakpoint: 0) {

// Type of chosen variables.
$font-value: type-of($fontsize);
$break-value: type-of($breakpoint);

// Cap height
$cap-height: map-get($font, cap-height);

// Check if value exists in scale.
$in-scale: in-modular-scale(scale-0, $fontsize);

// Set the line-height (if it isn't set at 0).
@if $lineheight != 0 {
  line-height: #{$lineheight}rem;
}

// If specifying a breakpoint to use (and breakpoint exists).
@if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

  // If using a number for fontsize.
  @if $font-value == number {
    $rootsize: nth($sizes, ($breakpoint + 1));
    $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
    $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};

    margin-bottom: #{$baseline-push}rem;
    padding-top: #{$baseline-shift}rem;

  // If using a variable from the scale for fontsize.
  } @else if $in-scale == true {
    $get-scale: map-get($modular-scale, scale-#{$breakpoint});
    $get-size: map-get($get-scale, $fontsize);
    $rootsize: nth($sizes, ($breakpoint + 1));

    $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
    $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};

    margin-bottom: #{$baseline-push}rem;
    padding-top: #{$baseline-shift}rem;

  } @else {
    @warn "#{$fontsize} is not a valid scale variable";
  }

// If want to use value for all breakpoints.
} @else if $breakpoint == all {

  // If using a number for fontsize.
  @if $font-value == number {
    $rootsize: nth($sizes, 1);
    $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
    $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};

    margin-bottom: #{$baseline-push}rem;
    padding-top: #{$baseline-shift}rem;

    // Loop through breakpoints.
    @for $i from 2 through $breakpoints-limit {
      $rootsize: nth($sizes, $i);
      $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};

      @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
        margin-bottom: #{$baseline-push}rem;
        padding-top: #{$baseline-shift}rem;
      }
    }

  // If using a variable from the scale for fontsize.
  } @else if $in-scale == true {
    $get-scale: map-get($modular-scale, scale-0);
    $get-size: map-get($get-scale, $fontsize);
    $rootsize: nth($sizes, 1);

    $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
    $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};

    margin-bottom: #{$baseline-push}rem;
    padding-top: #{$baseline-shift}rem;

    // Loop through breakpoints.
    @for $i from 2 through $breakpoints-limit {
      $get-scale: map-get($modular-scale, scale-#{$i - 1});
      $get-size: map-get($get-scale, $fontsize);
      $rootsize: nth($sizes, $i);

      $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};

      @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
        margin-bottom: #{$baseline-push}rem;
        padding-top: #{$baseline-shift}rem;
      }
    }

  } @else {
    @warn "#{$fontsize} is not a valid scale variable";
  }

} @else {
  @warn "#{$breakpoint} is not valid to use as a breakpoint";
}

}

// Set fontsize and baseline at once. Mix of fontsize and baseline mixin. @mixin sassline($fontsize, $font, $lineheight: 2, $below: 2, $breakpoint: 0) {

$font-value: type-of($fontsize);
$break-value: type-of($breakpoint);
$cap-height: map-get($font, cap-height);
$in-scale: in-modular-scale(scale-0, $fontsize);

line-height: #{$lineheight}rem;

@if $break-value == number and $breakpoint <= ($breakpoints-limit - 1) and $breakpoint >= 0 {

  @if $font-value == number {
    $rootsize: nth($sizes, ($breakpoint + 1));
    $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
    $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};
    font-size: #{$fontsize / nth($sizes, ($breakpoint + 1))}rem;
    margin-bottom: #{$baseline-push}rem;
    padding-top: #{$baseline-shift}rem;

  } @else if $in-scale == true {
    $get-scale: map-get($modular-scale, scale-#{$breakpoint});
    $get-size: map-get($get-scale, $fontsize);
    $rootsize: nth($sizes, ($breakpoint + 1));
    $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
    $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};
    font-size: #{$get-size / nth($sizes, ($breakpoint + 1))}rem;
    margin-bottom: #{$baseline-push}rem;
    padding-top: #{$baseline-shift}rem;

  } @else {
    @warn "#{$fontsize} is not a valid scale variable";
  }

} @else if $breakpoint == all {

  @if $font-value == number {
    $rootsize: nth($sizes, 1);
    $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
    $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};
    font-size: #{$fontsize / nth($sizes, 1)}rem;
    margin-bottom: #{$baseline-push}rem;
    padding-top: #{$baseline-shift}rem;

    @for $i from 2 through $breakpoints-limit {
      $rootsize: nth($sizes, $i);
      $baseline-shift: #{($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($fontsize / 2 * (($lineheight * $rootsize / $fontsize) - $cap-height)) / $rootsize + 0.00001)};
      @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
        font-size: #{$fontsize / nth($sizes, $i)}rem;
        margin-bottom: #{$baseline-push}rem;
        padding-top: #{$baseline-shift}rem;
      }
    }

  } @else if $in-scale == true {
    $get-scale: map-get($modular-scale, scale-0);
    $get-size: map-get($get-scale, $fontsize);
    $rootsize: nth($sizes, 1);
    $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
    $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};
    font-size: #{$get-size / nth($sizes, 1)}rem;
    margin-bottom: #{$baseline-push}rem;
    padding-top: #{$baseline-shift}rem;

    @for $i from 2 through $breakpoints-limit {
      $get-scale: map-get($modular-scale, scale-#{$i - 1});
      $get-size: map-get($get-scale, $fontsize);
      $rootsize: nth($sizes, $i);
      $baseline-shift: #{($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001};
      $baseline-push: #{$below - (($get-size / 2 * (($lineheight * $rootsize / $get-size) - $cap-height)) / $rootsize + 0.00001)};
      @media screen and (min-width: nth($points, $i) / 16 * 1em ) {
        font-size: #{$get-size / nth($sizes, $i)}rem;
        margin-bottom: #{$baseline-push}rem;
        padding-top: #{$baseline-shift}rem;
      }
    }

  } @else {
    @warn "#{$fontsize} is not a valid scale variable";
  }

} @else {
  @warn "#{$breakpoint} is not valid to use as a breakpoint";
}

}

// Clearfix. @mixin clearfix {

&:before, &:after{
  display: table;
  content: "";
}
&:after{
  clear: both;
}

}