susy grid mixin

_grid.sass

//-----------------------------------------------------------------------------
// Imports

@import compass
@import susy

//-----------------------------------------------------------------------------
// Grid Settings


=grid-settings($cols: $total-columns, $width: $column-width, $gutter: $gutter-width, $padding: $grid-padding)

  // keep the defaults around
  $default-cols: $total-columns
  $default-width: $column-width
  $default-gutter: $gutter-width
  $default-padding: $grid-padding

  // use the new settings
  $total-columns: $cols
  $column-width: $width
  $gutter-width: $gutter
  $grid-padding: $padding

  // apply to contents
  @content

  // re-instate the defaults
  $total-columns: $default-cols
  $column-width: $default-width
  $gutter-width: $default-gutter
  $grid-padding: $default-padding

_layout.sass

//-----------------------------------------------------------------------------
// Imports

@import grid

//-----------------------------------------------------------------------------
// Grid Settings

$grid-background-column-color: rgba(255, 236, 0, 0.2)

//-----------------------------------------------------------------------------
// Other Settings

* 
	+box-sizing(border-box)

+grid-settings(6,9.188em,1.313em,1.313em)
	.wrapper
		+container()
		+susy-grid-background

	#main,#sub
		width: columns(2,6) + gutter()/2
		float: left
		border-right: 1px solid lighten(#444444,20%)
		padding: gutter()/2

	#aside
		+span-columns(2 omega,6)
		padding: gutter()/2 0

+grid-settings(4,14.500em,1.313em,1.313em)
	footer
		clear: both
		+container()
		+susy-grid-background
		div
			+span-columns(4,16)