SyDES plugin: Add dropdown with all sites in context menu

context-sites.php

<?php
$app->on('before.module', '*', function() use($app){
	$app->response->context['sites'] = array(
		'title' => 'Сайты',
		'link' => '',
		'children' => array(),
	);
	
	$allsites = $app->cache->get('allsites');
	if (!$allsites){
		foreach (glob(DIR_SITE . 's*', GLOB_ONLYDIR) as $sitepath){
			$conf = include $sitepath . '/config.php';
			$site = str_replace(DIR_SITE, '', $sitepath);
			$allsites[$site] = $conf['name'];
		}
		$app->cache->set('allsites', $allsites, 604800);
	}

	foreach ($allsites as $site => $name){
		$app->response->context['sites']['children'][] = array(
			'title' => $name,
			'link' => '/admin/?site='.$site,
			'modal' => false
		);
	}
});