feat(entry): implement def validate_wayland_environment

scanslicer/entry.py

@@ -97,3 +97,20 @@ def configure_qt_backend(backend):
     # settings when available (for example dark/light mode).
     if os.path.exists("/.dockerenv"):
         os.environ.setdefault("QT_QPA_PLATFORMTHEME", "gtk3")
+
+
+# validate_wayland_environment: function definition for ScanSlicer behavior.
+def validate_wayland_environment():
+    runtime_dir = os.environ.get("XDG_RUNTIME_DIR", "").strip()
+    display_name = os.environ.get("WAYLAND_DISPLAY", "").strip()
+    if not runtime_dir or not display_name:
+        raise RuntimeError(
+            "Missing Wayland runtime environment. "
+            "Set XDG_RUNTIME_DIR and WAYLAND_DISPLAY."
+        )
+
+    socket_path = os.path.join(runtime_dir, display_name)
+    if not os.path.exists(socket_path):
+        raise RuntimeError(
+            f"Wayland socket not found: {socket_path}"
+        )