Statamic {{ nav_from }} tag

NavFrom.php

<?php

namespace App\Tags;

use Statamic\Support\Str;
use Statamic\Tags\Nav;

class NavFrom extends Nav
{
    /**
     * The {{ nav_from }} tag.
     *
     * @return string|array
     */
    public function index()
    {
        $nav = parent::index();
        
        $from_uri = $this->params->get('from_uri');
        if (!$from_uri)
            return $nav;
        
        $segments = explode('/', Str::removeLeft($from_uri, '/'));
                 
        $segment = '';
        while (count($segments) > 0) {
            
            $segment .= '/'.array_shift($segments);
            
            $nav = collect($nav)->first(function ($entry) use ($segment) {
                return $entry['uri'] == $segment;
            });
                        
            if (!$nav || !count($nav['children']))
                return collect(['no_results' => true]);
                
            $nav = $nav['children'];
        
        }
                
        return $nav;
        
    }
}

usage.antlers.html

<!-- use like -->
{{ nav_from handle="xxx" :from_uri="whatever/page/to/start/at" }}