Adding convenience codegen(..) function

src/codegen.inc.php

@@ -2,6 +2,18 @@
 namespace metagen_php;
 use Exception;
 
+function codegen(?string $cache_dir, \mtgMetaInfo $meta, array $options = []) : string
+{
+  $twig = get_twig();
+
+  if(!empty($cache_dir))
+    $twig->setCache($cache_dir);
+
+  $options['meta'] = $meta;
+
+  return $twig->render('codegen_bundle.twig', $options);
+}
+
 function get_twig(array $inc_path = [])
 {
   array_unshift($inc_path, __DIR__ . "/../tpl/");