Sass color-hacker

color-hacker.scss

@function scale-to-adjust($start, $change) {
  @if($change > 0) {
    $end: $start + $change;
    @return percentage(($end - $start)/(100 - $start));
  } @else {
    @return percentage($change / $start);
  }
}

@function scale-key($key, $color) {
  $h: hue($color) - hue($key);
  $s: saturation($color) - saturation($key);
  $l: lightness($color) - lightness($key);
  @return "scale-color(adjust-hue($key, #{$h}), $saturation: #{scale-to-adjust(saturation($key), $s)}, $lightness: #{scale-to-adjust(lightness($key), $l)}); ";
}

@function adjust-key($key, $color) {
  $h: hue($color) - hue($key);
  $s: saturation($color) - saturation($key);
  $l: lightness($color) - lightness($key);
  @return "adjust-color($key, $hue: #{$h}, $saturation: #{$s}, $lightness: #{$l}); ";
}

@function hack-colors($colors, $method: scale){
  $key: nth($colors, 1);
  $hack: "$key: #{$key}; ";
  @for $i from 2 through length($colors) {
    @if $method == scale {
     $hack: $hack + "$color-#{$i}: #{scale-key($key, nth($colors, $i))}";
   } @else {
     $hack: $hack + "$color-#{$i}: #{adjust-key($key, nth($colors, $i))}";
   }
  }
  @return $hack;
}

@debug(hack-colors(#aaff00 #e8ffbb));