Update web/core/context_processors.py

web/core/context_processors.py

@@ -1,5 +1,7 @@
 from pathlib import Path
 from .models_ann import Announcement, AnnouncementDismissal
+from django.contrib.staticfiles import finders
+import os
 
 def app_version(request):
     version_file = Path(__file__).resolve().parent.parent / "version.txt"
@@ -10,7 +12,19 @@ def app_version(request):
         version = "v0.0.0"
     return {"APP_VERSION": version}
 
-
+def available_themes(request):
+    """Returns ['midnight','dawn','forest','sandstone', ...] by scanning /static/themes/*.css"""
+    names = []
+    # Find the absolute path for the 'themes' directory via staticfiles finders
+    # We look for any 'themes' folder that exists and aggregate CSS files.
+    for finder in finders.get_finders():
+        for path, storage in finder.list(['themes']):
+            if path.startswith('themes/') and path.endswith('.css'):
+                base = os.path.basename(path)[:-4]  # strip .css
+                names.append(base)
+    # stable order
+    names = sorted(set(names))
+    return {'available_themes': names}
 
 def pending_announcement(request):
     """