Create a generic form fragment renderer

core/utils.py

@@ -13,22 +13,41 @@
 #
 #
 
+from dataclasses import dataclass
 from datetime import date
 
 # Image utils
 from io import BytesIO
-from typing import Optional
+from typing import Any
 
 import PIL
 from django.conf import settings
 from django.core.files.base import ContentFile
+from django.forms import BaseForm
 from django.http import HttpRequest
+from django.template.loader import render_to_string
+from django.utils.html import SafeString
 from django.utils.timezone import localdate
 from PIL import ExifTags
 from PIL.Image import Image, Resampling
 
 
-def get_start_of_semester(today: Optional[date] = None) -> date:
+@dataclass
+class FormFragmentTemplateData[T: BaseForm]:
+    """Dataclass used to pre-render form fragments"""
+
+    form: T
+    template: str
+    context: dict[str, Any]
+
+    def render(self, request: HttpRequest) -> SafeString:
+        # Request is needed for csrf_tokens
+        return render_to_string(
+            self.template, context={"form": self.form, **self.context}, request=request
+        )
+
+
+def get_start_of_semester(today: date | None = None) -> date:
     """Return the date of the start of the semester of the given date.
     If no date is given, return the start date of the current semester.
 
@@ -58,7 +77,7 @@ def get_start_of_semester(today: Optional[date] = None) -> date:
     return autumn.replace(year=autumn.year - 1)
 
 
-def get_semester_code(d: Optional[date] = None) -> str:
+def get_semester_code(d: date | None = None) -> str:
     """Return the semester code of the given date.
     If no date is given, return the semester code of the current semester.