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//
// 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 https://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);
}
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