responsive-utilities.generator.scss

// Responsive Utilities – Author & copyright (c) 2015: John Polacek
// Follow on Twitter: @johnpolacek
// Dual MIT & GPL license
// Project Page: http://johnpolacek.github.com/responsive-utilities-generator  
  
//* generate responsive utility classes for each breakpoint, defaults defined below */
@mixin responsiveUtilitiesGenerator(
    $breakpoints: (0, 480px, 800px), // breakpoints
    $breakpointType: 'px',           // breakpoint type px or em 
    $breakpointPrefixes: (s-,m-,l-)  // breakpoint prefixes
  ) {

  //* top-level classes first, no prefix */
  @include utilityClasses();
  
  //* classes for each breakpoint, with prefix */
  @for $i from 1 through length($breakpointPrefixes) {
    $prefix: nth($breakpointPrefixes, $i);
    $breakpoint_min: nth($breakpoints, $i);

    // Add one to support pixel breakpoints, EMs don't need the extra bump
    //@if $breakpointType == 'px' {
    //  $breakpoint_min: nth($breakpoints, $i) + 1;
    //

    $breakpoint_max: '';

    @if $i < length($breakpointPrefixes) {
      $breakpoint_max: nth($breakpoints, $i+1);
    }

   //* smallest breakpoint */
    @if $breakpoint_min == 1 {

      @media (max-width: $breakpoint_max) {
        @include utilityClasses($prefix);
      }
          
    } @else {

      //* middle breakpoints */
      @if $breakpoint_max != '' {

        @media (min-width: $breakpoint_min) {
          @include utilityClasses($prefix);
        }

      //* largest breakpoint */
      } @else {

        @media (min-width: $breakpoint_min) {
          @include utilityClasses($prefix);
        }
      }
    }
  }
}