riot mixin for converting opts.class to a list.

classlister.mixin.js

(function(riot) {
  /** resets the classlist from tag options. */
  var listClasses = function(tag) {
    tag.classlist = tag.opts.class ? tag.opts.class.split(/\s+/) : [];
  };
  var mixin = {
    init: function() {
      listClasses(this);
      this.on('before-update', function() { listClasses(this); }.bind(this));
    },

    /** conatiner for classnames. */
    classlist: [],

    /**
     * gets the classlist as a string.
     *
     * @return string  space-separated list of classnames
     */
    classes: function() { return this.classlist.join(' '); }
  };
  
  riot.mixin('classlister', mixin);
})(riot);