added attendee_email placeholder

pretix_email_template_plugin/apps.py

@@ -7,16 +7,15 @@
 except ImportError:
     raise RuntimeError("Please use pretix 2.7 or above to run this plugin!")
 
-
 class PluginApp(PluginConfig):
     default = True
     name = "pretix_email_template_plugin"
-    verbose_name = "Email Template"
+    verbose_name = "Email template helper"
 
     class PretixPluginMeta:
         name = gettext_lazy("Email Template")
         author = "Your name"
-        description = gettext_lazy("Short description")
+        description = gettext_lazy("More email template placeholders, such as {attendee_email}")
         visible = True
         version = __version__
         category = "FEATURE"

pretix_email_template_plugin/signals.py

@@ -1 +1,31 @@
 # Register your receivers here
+from django.dispatch import receiver
+
+from pretix.base.signals import register_text_placeholders
+from pretix.base.email import BaseMailTextPlaceholder
+
+class AttendeeEmailPlaceholder(BaseMailTextPlaceholder):
+    def __init__(self):
+        self._identifier = "attendee_email"
+
+    @property
+    def required_context(self):
+        return ["order", "position"]
+
+    @property
+    def identifier(self):
+        return self._identifier
+
+    def render(self, context):
+        position = context["position"]
+        # TODO: print statement for sanity check -- remove
+        print(f"attendee_email: {position.attendee_email}")
+        return position.attendee_email
+
+    def render_sample(self, context):
+        return "[email protected]"
+
+
+@receiver(register_text_placeholders, dispatch_uid="placeholder_custom")
+def register_placeholder_renderers(sender, **kwargs):
+    return AttendeeEmailPlaceholder()