position.styl v2.0 :: see http://codepen.io/thybzi/pen/eZGrRW/?editors=0100

position.styl

/**
 * Set `position` property, as well as `top`, `right`, `bottom`, `left` properties
 * After the first argument, accepts 1 to 4 additional args, ordered and working "as for padding"
 * To skip any of values, set it to `null`
 * @mixin
 * @example position(absolute, 5px, 10px, 0, auto)
 * @example position(absolute, 5px, null, 0, auto)
 * @example position(fixed, 5px, 10px)
 * @example position(fixed, 0)
 */
position()
  $arglen = length(arguments)
  if $arglen >= 1
    position: arguments[0]

  $sides = $arglen - 1
  if $sides == 1
    $top = $right = $bottom = $left = arguments[1]
  else if $sides == 2
    $top = $bottom = arguments[1]
    $right = $left = arguments[2]
  else if $sides == 3
    $top = arguments[1]
    $right = $left = arguments[2]
    $bottom = arguments[3]
  else if $sides >= 4
    $top = arguments[1]
    $right = arguments[2]
    $bottom = arguments[3]
    $left = arguments[4]

  if $left is a 'unit' or $left == 'auto'
    left: $left
  if $right is a 'unit' or $right == 'auto'
    right: $right
  if $top is a 'unit' or $top == 'auto'
    top: $top
  if $bottom is a 'unit' or $bottom == 'auto'
    bottom: $bottom

/**
 * Set `position: absolute`, as well as `top`, `right`, `bottom`, `left` properties
 * Accepts 1 to 4 arguments, ordered and working "as for padding"
 * To skip any of values, set it to `null`
 * @mixin
 * @example absolute(5px, 10px, 0, auto)
 * @example absolute(5px, null, 0, auto)
 * @example absolute(5px, 10px)
 * @example absolute(0)
 */
absolute()
  unshift(arguments, absolute)
  position(arguments)

/**
 * @mixin Set `position: fixed`, as well as `top`, `right`, `bottom`, `left` properties
 * @see absolute()
 */
fixed()
  unshift(arguments, fixed)
  position(arguments)

/**
 * @mixin Set `position: relative`, as well as `top`, `right`, `bottom`, `left` properties
 * @see absolute()
 */
relative()
  unshift(arguments, relative)
  position(arguments)
  
  
//// USAGE ////
.direct
  position(absolute, 1px, 2px, 3px, 4px)
  
.direct-3sides
  position(relative, 1px, 2px, 3px)

.direct-3sides-null
  position(fixed, 1px, 2px, 3px, null)
  
.direct-3sides-null-transparent
  position: fixed 1px 2px 3px null
  
.absolute-0
  absolute(0)
  
.absolute-0-transparent
  absolute: 0
  
.fixed-2sides-transparent
  fixed: 4px 10px
  
.fixed-3sides
  fixed(4px, 10px, 30px)
  
.relative-bottomonly-transparent
  relative: null null 4px null