Sass for generating a Gridset style 1-4-8 column responsive grid

8-column gridset Sass

$font-size: 1em
$line-height: 1.5em

@mixin column($width, $offset)
  margin-left: $offset
  width: $width
  float: left
  padding: 0 $line-height/2 0 $line-height/2
  -webkit-box-sizing: border-box
  box-sizing: border-box

.m1
  @include column(100%, 0)

@media only screen and (min-width: 767px)
  @for $i from 1 through 4
    .t#{$i}
      @include column(25% * $i, 0)

    @for $j from 1 through $i
      .t#{$j}-#{$i}
        @include column(25% * ($i - $j + 1), 25% * ($j - 1))

@media only screen and (min-width: 1023px)
  @for $i from 1 through 8
    .d#{$i}
      @include column(12.5% * $i, 0)

    @for $j from 1 through $i
      .d#{$j}-#{$i}
        @include column(12.5% * ($i - $j + 1), 12.5% * ($j - 1))

Just the bare bones to get started.