Less for each loop for theme building

themes.less

// .for
.for(@i, @n) {.-each(@i)}
.for(@n)     when (isnumber(@n)) {.for(1, @n)}
.for(@i, @n) when not (@i = @n)  {
    .for((@i + (@n - @i) / abs(@n - @i)), @n);
}

// .for-each
.for(@array)   when (default()) {.for-impl_(length(@array))}
.for-impl_(@i) when (@i > 1)    {.for-impl_((@i - 1))}
.for-impl_(@i)                  {.-each(extract(@array, @i))}

// ............................................................

.theme(textmate) {
  @bg: #dcdcdc;
  @fg: #333;
}

.theme(terminal) {
  @bg: #000;
  @fg: #fff;
}


@themes: 'textmate', 'terminal';

body {
  .for(@themes); .-each(@color) {
    @name: e(@color);
    &.@{name} {
      .theme(@name);
      
      color: @fg;
      background-color: @bg;
    }
  }
}

/* Output
body.textmate {
  color: #333333;
  background-color: #dcdcdc;
}

body.terminal {
  color: #ffffff;
  background-color: #000000;
}
*/