Plugin.php

<?php
namespace TracToGitlab;

use DI;
use Studip\DIContainer;
use StudIPPlugin;

abstract class Plugin extends StudIPPlugin
{
    protected function setupDiContainer()
    {
        $container = DIContainer::getInstance();

        $definitions = require __DIR__ . '/../bootstrap-definitions.php';

        foreach ($definitions as $name => $value) {
            if ($value instanceof \Closure) {
                $value = $value($container);
            }
            $container->set($name, $value);
        }
    }

    public function perform($unconsumed_path)
    {
        require_once $this->getPluginPath() . '/vendor/autoload.php';

        $this->setupDiContainer();

        parent::perform($unconsumed_path);
    }
}