function run()
{
$loader = new Twig_Loader_Filesystem($this->templateDir, ['cache' => false, 'debug' => true]);
$twig = new Twig_Environment($loader);
$GLOBALS['PHPDocMD_classDefinitions'] = $this->classDefinitions;
$GLOBALS['PHPDocMD_linkTemplate'] = $this->linkTemplate;
$filter = new Twig_SimpleFilter('classLink', ['PHPDocMd\\Generator', 'classLink']);
$twig->addFilter($filter);
foreach ($this->classDefinitions as $className => $data) {
$output = $twig->render('class.twig', $data);
file_put_contents($this->outputDir . '/' . $data['fileName'], $output);
}
$index = $this->createIndex();
$index = $twig->render('index.twig', ['index' => $index, 'classDefinitions' => $this->classDefinitions]);
file_put_contents($this->outputDir . '/' . $this->apiIndexFile, $index);
}