BookStack/app/Entities/BreadcrumbsViewComposer.php

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<?php namespace BookStack\Entities;
use Illuminate\View\View;
class BreadcrumbsViewComposer
{
protected $entityContextManager;
/**
* BreadcrumbsViewComposer constructor.
* @param EntityContextManager $entityContextManager
*/
public function __construct(EntityContextManager $entityContextManager)
{
$this->entityContextManager = $entityContextManager;
}
/**
* Modify data when the view is composed.
* @param View $view
*/
public function compose(View $view)
{
$crumbs = $view->getData()['crumbs'];
if (array_first($crumbs) instanceof Book) {
$shelf = $this->entityContextManager->getContextualShelfForBook(array_first($crumbs));
if ($shelf) {
array_unshift($crumbs, $shelf);
$view->with('crumbs', $crumbs);
}
}
}
}