Using an extension to split a textarea into lines

template.tpl

<pop:content>
  <select name="sizes">
    <pop:utils:split field="sizes">
      <option><pop:value/></option>
    </pop:utils:split>
  </select>
</pop:content>

utils.js

exports.split = function(options, enclosed, scope) {
  var val = scope.lookup(options.field);
  if (val) { return val.split("\n"); }
}