Fix #953 -- Render markdown in email text previews

src/pretix/control/views/event.py

@@ -5,6 +5,7 @@ from datetime import timedelta
 from decimal import Decimal
 from urllib.parse import urlsplit
 
+import bleach
 from django.conf import settings
 from django.contrib import messages
 from django.contrib.contenttypes.models import ContentType
@@ -38,6 +39,7 @@ from pretix.base.services import tickets
 from pretix.base.services.invoices import build_preview_invoice_pdf
 from pretix.base.signals import register_ticket_outputs
 from pretix.base.templatetags.money import money_filter
+from pretix.base.templatetags.rich_text import markdown_compile
 from pretix.control.forms.event import (
     CommentForm, DisplaySettingsForm, EventDeleteForm, EventMetaValueForm,
     EventSettingsForm, EventUpdateForm, InvoiceSettingsForm, MailSettingsForm,
@@ -614,7 +616,9 @@ class MailSettingsPreview(EventPermissionRequiredMixin, View):
                 idx = matched.group('idx')
                 if idx in self.supported_locale:
                     with translation.override(self.supported_locale[idx]):
-                        msgs[self.supported_locale[idx]] = v.format_map(self.placeholders(preview_item))
+                        msgs[self.supported_locale[idx]] = bleach.linkify(markdown_compile(
+                            v.format_map(self.placeholders(preview_item))
+                        ))
 
         return JsonResponse({
             'item': preview_item,