/**
* Return an index of existing links.
*
* @param LinkTreeBuilder $tree
* @param MenuRepositoryInterface $menus
* @param null $menu
* @return \Illuminate\Http\RedirectResponse|\Illuminate\Http\Response
*/
public function index(LinkTreeBuilder $tree, MenuRepositoryInterface $menus, $menu = null)
{
if (!$menu) {
$this->messages->warning('Please choose a menu first.');
return $this->response->redirectTo('admin/navigation');
}
$tree->setMenu($menu = $menus->findBySlug($menu));
$this->breadcrumbs->add($menu->getName(), $this->request->fullUrl());
return $tree->render();
}
