Finaly got the routing right.

src/Hackspace/Bundle/CalciferBundle/Controller/LocationController.php

@@ -2,6 +2,7 @@
 
 namespace Hackspace\Bundle\CalciferBundle\Controller;
 
+use Doctrine\Common\Annotations\Annotation\Required;
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\EntityRepository;
 use Doctrine\ORM\QueryBuilder;
@@ -35,11 +36,11 @@ class LocationController extends Controller
     /**
      * Finds and displays a Event entity.
      *
-     * @Route("/{slug}(?!\.ics)", name="location_show")
+     * @Route("/{slug}.{format}", name="location_show", defaults={"format" = "html"})
      * @Method("GET")
      * @Template("CalciferBundle:Event:index.html.twig")
      */
-    public function showAction($slug)
+    public function showAction($slug,$format)
     {
         /** @var EntityManager $em */
         $em = $this->getDoctrine()->getManager();
@@ -67,52 +68,41 @@ class LocationController extends Controller
             ->andWhere('e.locations_id = :location')
             ->orderBy('e.startdate')
             ->setParameter('startdate',$now)
-            ->setParameter('location',$location->getId());
+            ->setParameter('location',$location->id);
         $entities = $qb->getQuery()->execute();
 
-        return array(
-            'entities' => $entities,
-            'location' => $location,
-        );
-    }
+        if ($format == 'ics') {
+            $calendar = new Calendar();
+            $calendar->setProdId('-//My Company//Cool Calendar App//EN');
 
-    /**
-     * Finds and displays a Event entity.
-     *
-     * @Route("/{slug}\.ics", name="location_show_ics")
-     * @Method("GET")
-     */
-    public function showActionICS($slug)
-    {
-        $results = $this->showAction(str_replace('.ics','',$slug));
-        $entities = $results['entities'];
+            foreach ($entities as $entity) {
+                /** @var Event $entity */
+                $event = new CalendarEvent();
+                $event->setStart($entity->startdate);
+                $event->setEnd($entity->enddate);
+                $event->setSummary($entity->summary);
+                $event->setDescription($entity->description);
+                $location = new \Jsvrcek\ICS\Model\Description\Location();
+                $location->setName($entity->getLocation()->name);
+                $event->setLocations([$location]);
+                $calendar->addEvent($event);
+            }
 
-        $calendar = new Calendar();
-        $calendar->setProdId('-//My Company//Cool Calendar App//EN');
+            $calendarExport = new CalendarExport(new CalendarStream, new Formatter());
+            $calendarExport->addCalendar($calendar);
 
-        foreach($entities as $entity) {
-            /** @var Event $entity */
-            $event = new CalendarEvent();
-            $event->setStart($entity->getStartdate());
-            if ($entity->getEnddate() instanceof DateTime)
-                $event->setEnd($entity->getEnddate());
-            $event->setSummary($entity->getSummary());
-            $event->setDescription($entity->getDescription());
-            $location = new \Jsvrcek\ICS\Model\Description\Location();
-            $location->setName($entity->getLocation()->getName());
-            $event->setLocations([$location]);
-            $calendar->addEvent($event);
+            //output .ics formatted text
+            $result = $calendarExport->getStream();
+
+            $response = new Response($result);
+            $response->headers->set('Content-Type', 'text/calendar');
+
+            return $response;
+        } else {
+            return array(
+                'entities' => $entities,
+                'location' => $location,
+            );
         }
-
-        $calendarExport = new CalendarExport(new CalendarStream, new Formatter());
-        $calendarExport->addCalendar($calendar);
-
-        //output .ics formatted text
-        $result =  $calendarExport->getStream();
-
-        $response = new Response($result);
-        $response->headers->set('Content-Type', 'text/calendar');
-
-        return $response;
     }
 }

src/Hackspace/Bundle/CalciferBundle/Controller/TagController.php

@@ -35,11 +35,11 @@ class TagController extends Controller
     /**
      * Finds and displays a Event entity.
      *
-     * @Route("/{slug}(?!\.ics)", name="tag_show")
+     * @Route("/{slug}.{format}", defaults={"format" = "html"}, name="tag_show")
      * @Method("GET")
      * @Template("CalciferBundle:Event:index.html.twig")
      */
-    public function showAction($slug)
+    public function showAction($slug, $format)
     {
         /** @var EntityManager $em */
         $em = $this->getDoctrine()->getManager();
@@ -55,60 +55,50 @@ class TagController extends Controller
         }
 
         $now = new \DateTime();
-        $now->setTime(0,0,0);
+        $now->setTime(0, 0, 0);
 
         /** @var QueryBuilder $qb */
         $qb = $em->createQueryBuilder();
-        $qb ->select(array('e'))
+        $qb->select(array('e'))
             ->from('CalciferBundle:Event', 'e')
             ->join('e.tags', 't', 'WITH', $qb->expr()->in('t.id', $tag->getId()))
             ->where('e.startdate >= :startdate')
             ->orderBy('e.startdate')
-            ->setParameter('startdate',$now);
+            ->setParameter('startdate', $now);
         $entities = $qb->getQuery()->execute();
 
-        return array(
-            'entities' => $entities,
-            'tag' => $tag,
-        );
-    }
+        if ($format == 'ics') {
+            $calendar = new Calendar();
+            $calendar->setProdId('-//My Company//Cool Calendar App//EN');
 
-    /**
-     * Finds and displays a Event entity.
-     *
-     * @Route("/{slug}.ics", name="tag_show_ics")
-     * @Method("GET")
-     */
-    public function showActionICS($slug)
-    {
-        $results = $this->showAction(str_replace('.ics','',$slug));
-        $entities = $results['entities'];
+            foreach ($entities as $entity) {
+                /** @var Event $entity */
+                $event = new CalendarEvent();
+                $event->setStart($entity->startdate);
+                $event->setEnd($entity->enddate);
+                $event->setSummary($entity->summary);
+                $event->setDescription($entity->description);
+                $location = new \Jsvrcek\ICS\Model\Description\Location();
+                $location->setName($entity->getLocation()->name);
+                $event->setLocations([$location]);
+                $calendar->addEvent($event);
+            }
 
-        $calendar = new Calendar();
-        $calendar->setProdId('-//My Company//Cool Calendar App//EN');
+            $calendarExport = new CalendarExport(new CalendarStream, new Formatter());
+            $calendarExport->addCalendar($calendar);
 
-        foreach($entities as $entity) {
-            /** @var Event $entity */
-            $event = new CalendarEvent();
-            $event->setStart($entity->getStartdate());
-            $event->setEnd($entity->getEnddate());
-            $event->setSummary($entity->getSummary());
-            $event->setDescription($entity->getDescription());
-            $location = new \Jsvrcek\ICS\Model\Description\Location();
-            $location->setName($entity->getLocation()->getName());
-            $event->setLocations([$location]);
-            $calendar->addEvent($event);
+            //output .ics formatted text
+            $result = $calendarExport->getStream();
+
+            $response = new Response($result);
+            $response->headers->set('Content-Type', 'text/calendar');
+
+            return $response;
+        } else {
+            return array(
+                'entities' => $entities,
+                'tag' => $tag,
+            );
         }
-
-        $calendarExport = new CalendarExport(new CalendarStream, new Formatter());
-        $calendarExport->addCalendar($calendar);
-
-        //output .ics formatted text
-        $result =  $calendarExport->getStream();
-
-        $response = new Response($result);
-        $response->headers->set('Content-Type', 'text/calendar');
-
-        return $response;
     }
 }