SASS Mixin: Generate background-image using raw SVG

svg-url.scss

//  Function to create an optimized svg url
//  http://codepen.io/jakob-e/pen/doMoML
@function svg-url($svg) {
  //  Chunk up string in order to avoid "stack level too deep" error
  $encoded: '';
  $slice: 2000;
  $index: 0;
  $loops: ceil(str-length($svg)/$slice);
  @for $i from 1 through $loops {
    $chunk: str-slice($svg, $index, $index + $slice - 1);
    //
    //   Encode (may need a few extra replacements)
    //
    $chunk: str-replace($chunk, '"', '\'');
    $chunk: str-replace($chunk, '<', '%3C');
    $chunk: str-replace($chunk, '>', '%3E');
    $chunk: str-replace($chunk, '&', '%26');
    $chunk: str-replace($chunk, '#', '%23');
    $encoded: #{$encoded}#{$chunk};
    $index: $index + $slice;
  }
  @return url("data:image/svg+xml;charset=utf8,#{$encoded}");
}

//  Helper function to replace characters in a string
@function str-replace($string, $search, $replace: '') {
  $index: str-index($string, $search);
  @if $index {
    @return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index +
      str-length($search)), $search, $replace);
  }
  @return $string;
}