Added a plugin for the coming pretixdroid application

src/pretix/plugins/pretixdroid/signals.py

@@ -0,0 +1,36 @@
+from django.core.urlresolvers import resolve, reverse
+from django.dispatch import receiver
+from django.template import Context
+from django.template.loader import get_template
+from django.utils.translation import ugettext_lazy as _
+
+from pretix.control.signals import html_head, nav_event
+
+
+@receiver(nav_event, dispatch_uid="pretixdroid_nav")
+def control_nav_import(sender, request=None, **kwargs):
+    url = resolve(request.path_info)
+    if not request.eventperm.can_change_orders:
+        return []
+    return [
+        {
+            'label': _('pretixdroid'),
+            'url': reverse('plugins:pretixdroid:config', kwargs={
+                'event': request.event.slug,
+                'organizer': request.event.organizer.slug,
+            }),
+            'active': (url.namespace == 'plugins:pretixdroid' and url.url_name == 'config'),
+            'icon': 'android',
+        }
+    ]
+
+
+@receiver(html_head, dispatch_uid="pretixdroid_html_head")
+def html_head_presale(sender, request=None, **kwargs):
+    url = resolve(request.path_info)
+    if url.namespace == 'plugins:pretixdroid':
+        template = get_template('pretixplugins/pretixdroid/control_head.html')
+        ctx = Context({})
+        return template.render(ctx)
+    else:
+        return ""