//
//  Check if var is in list
//  params => list, var
//
//  output => boolean
//
@function contains($list,$var) {
  @return (null != index($list, $var));
}


//
//  Prefix property with vendor names
//  params => property, values, vendors
//
//  output => -vendor-property: values
//            ...
//            property: values
//
@mixin prefix( $property, $values, $prefixes: () ) {
  @each $prefix in $prefixes {
    #{'-' + $prefix + '-' + $property}: #{$values};
  }

  // Output standard non-prefixed declaration
  #{$property}: #{$values};
}


//
//  Shadow list generator
//  params => color, length(number), inset?(str), blur?(px)
//
//  output => inset? 1px 1px blur color,
//            ...,
//            inset? (length-1)px (length-1)px blur color,
//            inset? (length)px (length)px blur color
//
@function long-shadow($scolor, $length, $inset:"", $blur: $icon-shadow-blur) {
  $list: ();
  @for $i from 1 through $length {
    $list: append($list ,unquote($inset) $i+px $i+px $blur $scolor, comma);
  }
  @return $list;
}


//
//  Extract all names
//  params => ( (name, color, inverted?), ...)
//
//  output => (name, ...)
//
@function brand-names($list) {
  $l: ();
  @each $name in $list {
    $l: append($l, #{nth($name, 1)}, comma);
  }
  @return $l;
}


//
//  Extract all not-inverted names
//  params => ( (name, color, inverted?), ...)
//
//  output => (name, ...)
//
@function normal-brand-names($list) {
  @return nth(classified-brand-names($list), 1);
}


//
//  Retrieve all inverted names
//  params => ( (name, color, inverted?), ...)
//
//  output => (name, ...)
//
@function inverted-brand-names($list) {
  @return nth(classified-brand-names($list), 2);
}


//
//  Classify not-inverted and inverted names
//  params => ( (name, color, inverted?), ...)
//
//  output => ( (not-inverted-name, ...), (inverted-name, ...) )
//
@function classified-brand-names($list) {
  $inverse: ();
  $normal: ();
  @each $name in $list {
    @if length($name) == 3 {
      $inverse: append($inverse, nth($name, 1), comma);
    } @else {
      $normal: append($normal, nth($name, 1), comma);
    }
  }
  @return ($normal $inverse);
}


//
//  Transform name-list to class-list
//  params => (name, ...)
//
//  output => (".name", ...)
//
@function list_to_classes($list, $prefix: "") {
  $l: ();
  @each $name in $list {
    $l: append($l, ".#{$prefix}#{$name}", comma);
  }
  @return $l;
}