Add a plugin API for ticket outputs

src/pretix/plugins/ticketoutputpdf/__init__.py

@@ -0,0 +1,30 @@
+from django.apps import AppConfig
+from django.utils.functional import cached_property
+from django.utils.translation import ugettext_lazy as _
+from pretix.base.plugins import PluginType
+
+
+class TicketOutputPdfApp(AppConfig):
+    name = 'pretix.plugins.ticketoutputpdf'
+    verbose_name = _("PDF ticket output")
+
+    class PretixPluginMeta:
+        type = PluginType.PAYMENT
+        name = _("PDF ticket output")
+        author = _("the pretix team")
+        version = '1.0.0'
+        description = _("This plugin allows you to print out tickets as PDF files")
+
+    def ready(self):
+        from . import signals  # NOQA
+
+    @cached_property
+    def compatibility_errors(self):
+        errs = []
+        try:
+            import reportlab
+        except ImportError:
+            errs.append("Python package 'reportlab' is not installed.")
+        return errs
+
+default_app_config = 'pretix.plugins.ticketoutputpdf.TicketOutputPdfApp'