icalendar.php

<?php
// see https://learn.getgrav.org/15/cookbook/plugin-recipes#output-some-php-code-result-in-a-twig-template
namespace Grav\Plugin;
use Grav\Common\Plugin;
use RocketTheme\Toolbox\Event\Event;

/**
 * Class IcalendarPlugin
 * @package Grav\Plugin
 */
class IcalendarPlugin extends Plugin
{
	/**
		* @return array
		*
		* The getSubscribedEvents() gives the core a list of events
		*     that the plugin wants to listen to. The key of each
		*     array section is the event that the plugin listens to
		*     and the value (in the form of an array) contains the
		*     callable (or function) as well as the priority. The
		*     higher the number the higher the priority.
		*/
	public static function getSubscribedEvents()
	{
		return [
			'onTwigExtensions' => ['IcalTwigExtensions', 0]		// wichtig, funktioniert sonst nicht !!
		];
	}
	public function IcalTwigExtensions()
	{
		require_once(__DIR__ . '/classes/EventListTwigExtension.class.php');
		// see https://discourse.getgrav.org/t/set-variable-in-twig-extension-class/9193/3
		$ext = new EventListTwigExtension();
		// add optional dateformat, default 'd.m.Y' 08.07.19
		$dateformat = $this->config->get('plugins.icalendar.dateformat','d.m.Y');
		$ext->setDateFormat($dateformat);	
		// DONE: limit (numevents) from config (yaml)
		$numevents = $this->config->get('plugins.icalendar.numevents');
		$ext->setNumEvents($numevents);	
		// DONE: Filename from config (yaml) -> relative to DATA_DIR/calendars !
		$icsfile = (DATA_DIR . 'calendars/'.$this->config->get('plugins.icalendar.icsfile'));
		$ext->setICSfile($icsfile);
		$this->grav['twig']->twig->addExtension($ext);
	}
}