// // Vertical Rhythm // // This is the minimal amount of code needed to create vertical rhythm in our // CSS. If you are looking for a robust solution, look at the excellent Typey // library. @see github.com/jptaranto/typey

@function normalize-rhythm($value, $relative-to: $base-font-size, $unit: $base-unit) {

@if unit($value) != px {
  @error "The normalize vertical-rhythm module only supports px inputs. The typey library is better.";
}
@if $unit == rem {
  @return ($value / $base-font-size) * 1rem;
}
@else if $unit == em {
  @return ($value / $relative-to) * 1em;
}
@else { // $unit == px
  @return $value;
}

}

@mixin normalize-font-size($value, $relative-to: $base-font-size) {

@if unit($value) != 'px' {
  @error "normalize-font-size() only supports px inputs. The typey library is better.";
}
font-size: normalize-rhythm($value, $relative-to);

}

@mixin normalize-rhythm($property, $values, $relative-to: $base-font-size) {

$value-list: $values;
$sep: space;
@if type-of($values) == 'list' {
  $sep: list-separator($values);
}
@else {
  $value-list: append((), $values);
}

$normalized-values: ();
@each $value in $value-list {
  @if unitless($value) and $value != 0 {
    $value: $value * normalize-rhythm($base-line-height, $relative-to);
  }
  $normalized-values: append($normalized-values, $value, $sep);
}
#{$property}: $normalized-values;

}

@mixin normalize-margin($values, $relative-to: $base-font-size) {

@include normalize-rhythm(margin, $values, $relative-to);

}

@mixin normalize-line-height($font-size, $min-line-padding: 2px) {

$lines: ceil($font-size / $base-line-height);
// If lines are cramped include some extra leading.
@if ($lines * $base-line-height - $font-size) < ($min-line-padding * 2) {
  $lines: $lines + 1;
}
@include normalize-rhythm(line-height, $lines, $font-size);

}