Copy / Micro Copy Class Generator

gistfile1.sass

=font-scale($sizes, $namespace: "copy", $micro_class: true)
  @each $scale in $sizes
    $current-breakpoint: nth($scale,1)
    $current-font-size: nth($scale,2)
    $base-size: $current-font-size !default  
    @if $current-breakpoint > 0
      +mq-min($current-breakpoint)
        .#{$namespace}
          font-size: $current-font-size
        @if $micro_class == true  
          // global micro copy
          .#{$namespace}__micro
            font-size: pct($base-size/$current-font-size)
          // modifiers
          @each $breakpoint in $sizes 
            $this-breakpoint: nth($breakpoint,1)
            $this-font-size: nth($breakpoint,2)
            @if $this-breakpoint > 0 and $this-breakpoint < $current-breakpoint
              .#{$namespace}__micro--#{$this-breakpoint}
                font-size: pct($this-font-size/$current-font-size)
    @else
      .#{$namespace}
        font-size: $current-font-size

// usage
$sizes: (0, 100%), (500, 200%), (1000, 300%), (1500, 400%)
+font-scale($sizes)