calculate percent

gistfile1.sass

$site-width: 962px;

@function calc-percent($target, $container) {

  // $container: $site-width !default; fails :(

  @return ($target / $container) * 100%;
}

.foo {
 width: calc-percent(387px, $site-width); 
}

.boo {
 width: calc-percent(387px); // this would be great but fails 
}

// It would awesome if we could get $container to default to $site-width
// if only a $target is passed. I checked out sass @if and !default but it always
// kicked up a stink when being passed 1 param.

@sirbrad why not use the default argument setting? See https://github.com/Integralist/Passage/blob/master/public/Assets/Styles/Sass/Functions/_fontsize.scss

e.g.

@function font-sizing ($target, $container: $site-width) {
    @return ($target / $container) * 100%;
}