baptisten-hohenacker_manual/user/plugins/python-script/python-script.php

<?php
namespace Grav\Plugin;

use Grav\Common\Plugin;
use RocketTheme\Toolbox\Event\Event;

/**
 * Class PythonScriptPlugin
 * @package Grav\Plugin
 */
class PythonScriptPlugin 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 [
            'onPluginsInitialized' => ['onPluginsInitialized', 0]
        ];
    }

    /**
     * Enable search only if url matches to the configuration.
     */
    public function onPluginsInitialized()
    {
        if ($this->isAdmin()) {
            $this->active = false;
            return;
        }

        $this->enable([
            'onTwigExtensions' => ['onTwigExtensions', 0]
        ]);

	}
     /**
     * Add Twig Extensions
     */
    public function onTwigExtensions()
    {
        require_once(__DIR__.'/twig/PythonScriptTwigExtension.php');
        $this->grav['twig']->twig->addExtension(new PythonScriptTwigExtension());
    }
}