gistfile1.txt

=color-mixer($color-name, $color-hex)
  $color-name: $color-hex
  $color-name + Light: lighten($color-name, 8%) 
  $color-name + Lighter: lighten($color-name, 16%) 
  $color-name + Dark: darken($color-name, 8%) 
  $color-name + Dark: darken($color-name, 16%) 

$purple
  +color-mixer($purple, #a2385d)

// Output
$purple:                      #a2385d
$purpleLight:                 lighten($purple, 8%)
$purpleLighter:               lighten($purple, 16%)
$purpleDark:                  darken($purple, 8%)
$purpleDarker:                darken($purple, 16%)