Swappable invoice renderers

src/pretix/control/forms/event.py

@@ -436,6 +436,11 @@ class InvoiceSettingsForm(SettingsForm):
             ('paid', _('Automatically on payment')),
         )
     )
+    invoice_renderer = forms.ChoiceField(
+        label=_("Invoice style"),
+        required=True,
+        choices=[]
+    )
     invoice_address_from = forms.CharField(
         widget=forms.Textarea(attrs={'rows': 5}), required=False,
         label=_("Your address"),
@@ -472,6 +477,13 @@ class InvoiceSettingsForm(SettingsForm):
         help_text=_('We will show your logo with a maximal height and width of 2.5 cm.')
     )
 
+    def __init__(self, *args, **kwargs):
+        event = kwargs.get('obj')
+        super().__init__(*args, **kwargs)
+        self.fields['invoice_renderer'].choices = [
+            (r.identifier, r.verbose_name) for r in event.get_invoice_renderers().values()
+        ]
+
 
 class MailSettingsForm(SettingsForm):
     mail_prefix = forms.CharField(

src/pretix/control/templates/pretixcontrol/event/invoicing.html

@@ -12,6 +12,7 @@
             {% bootstrap_field form.invoice_address_vatid layout="horizontal" %}
             {% bootstrap_field form.invoice_numbers_consecutive layout="horizontal" %}
             {% bootstrap_field form.invoice_generate layout="horizontal" %}
+            {% bootstrap_field form.invoice_renderer layout="horizontal" %}
             {% bootstrap_field form.invoice_language layout="horizontal" %}
             {% bootstrap_field form.invoice_address_from layout="horizontal" %}
             {% bootstrap_field form.invoice_introductory_text layout="horizontal" %}

src/pretix/control/views/event.py

@@ -310,9 +310,9 @@ class InvoicePreview(EventPermissionRequiredMixin, View):
     permission = 'can_change_event_settings'
 
     def get(self, request, *args, **kwargs):
-        pdf = build_preview_invoice_pdf(request.event)
-        resp = HttpResponse(pdf, content_type='application/pdf')
-        resp['Content-Disposition'] = 'attachment; filename="invoice-preview.pdf"'
+        fname, ftype, fcontent = build_preview_invoice_pdf(request.event)
+        resp = HttpResponse(fcontent, content_type=ftype)
+        resp['Content-Disposition'] = 'attachment; filename="{}"'.format(fname)
         return resp