font-face mixin override with unicode-range and local('') support.

_font-face.scss

// ______________________________________________________________________ //
//                        font-face mixin override                        //
// ______________________________________________________________________ //
@mixin font-face(
  $name,
  $font-files,
  $eot: false,
  $weight: false,
  $style: false,
  $unicode-range: false,
  $local: false
) {
  $iefont: unquote("#{$eot}?#iefix");
  @font-face {
    font-family: quote($name);
    @if $eot {
      src: font-url($eot);
      $font-files: font-url($iefont) unquote("format('embedded-opentype')"), $font-files;
    }
    @if $local {
      src: local(quote($local)), $font-files;
    } @else {
      src: $font-files;
    }
    @if $unicode-range {
      unicode-range: $unicode-range;
    }
    @if $weight {
      font-weight: $weight;
    }
    @if $style {
      font-style: $style;
    }
  }
}

_webfonts.scss

@include font-face(
  "myfont",
  font-files(
    "myfont.woff", woff,
    "myfont.ttf", opentype,
    "myfont.svg#webfontJRppkSIE", svg
  ),
  "myfont.eot",
  normal,
  normal,
  (U+1700-1714, U+1735-1736),
  ☺
);

result.css

@font-face {
  font-family: "myfont";
  src: url('myfont.eot');
  src: local("☺"), url('myfont.eot?#iefix') format('embedded-opentype'), url('myfont.woff') format('woff'), url('myfont.ttf') format('opentype'), url('myfont.svg#webfontJRppkSIE') format('svg');
  unicode-range: U+1700-1714, U+1735-1736;
  font-weight: normal;
  font-style: normal; }