$em = \Core::make('database/orm')->entityManager();
$r = $em->getRepository('\Concrete\Core\Entity\Express\Form');
$f = $r->findOneById('{form id goes here}');
$n = new Form();
$n->setName($f->getName().' - Copy');
$n->setEntity($f->getEntity());
$em->persist($n);
$em->flush();
foreach($f->getFieldSets() as $fs) {
   $nfs = new FieldSet();
   $nfs->setTitle($fs->getTitle());
   $nfs->setForm($n);
   $em->persist($nfs);
   $em->flush();
   foreach($fs->getControls() as $c) {
      if(get_class($c) == 'Concrete\Core\Entity\Express\Control\AttributeKeyControl') {
         $nc = new AttributeKeyControl();
         $nc->setId((new UuidGenerator())->generate($em, $nc));
         $l = $c->getCustomLabel() != null && $c->getCustomLabel() != '' ? $c->getCustomLabel() : null;
         $nc->setAttributeKey($c->getAttributeKey());
         $nc->setCustomLabel($l);
         $nc->setFieldSet($nfs);
         $em->persist($nc);
         $em->flush();
      }
   }
}