gistfile1.js

.directive('sdwTopbarLeft', function() {
      return {
        restrict: 'EA',
        require: '^sdwTopbar',
        transclude: true,
        template: '<div class="sdw-topbar-left" ng-transclude></div>',
        link: topbarLeftLink
      };

      function topbarSideLink(scope, element, attrs, controller) {
        var classes = (attrs['class'] || '').split(' ');
        classes.forEach(function(cls) {
          element.addClass(cls);
        });
      }
    });