clan-app: Fix nix run .#clan-app

pkgs/clan-app/clan_app/app.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 import logging
+import os
 from typing import Any, ClassVar
 
 import gi
@@ -56,9 +57,7 @@ class MainApplication(Adw.Application):
             None,
         )
 
-        site_index: Path = (
-            Path(__file__).parent.parent / Path("clan_app/.webui/index.html")
-        ).resolve()
+        site_index: Path = Path(os.getenv("WEBUI_PATH", ".")).resolve() / "index.html"
         self.content_uri = f"file://{site_index}"
         self.window: MainWindow | None = None
         self.connect("activate", self.on_activate)

pkgs/clan-app/default.nix

@@ -75,6 +75,7 @@ python3.pkgs.buildPythonApplication rec {
 
   makeWrapperArgs = [
     "--set FONTCONFIG_FILE ${fontconfig.out}/etc/fonts/fonts.conf"
+    "--set WEBUI_PATH $out/${python3.sitePackages}/clan_app/.webui"
     # This prevents problems with mixed glibc versions that might occur when the
     # cli is called through a browser built against another glibc
     "--unset LD_LIBRARY_PATH"