Add hook to get gridsquare dm files

src/murfey/client/contexts/spa_metadata.py

@@ -1,4 +1,5 @@
 import logging
+from importlib.metadata import entry_points
 from pathlib import Path
 from typing import Dict, Optional
 
@@ -346,3 +347,28 @@ def post_transfer_epu(
                         },
                     )
                     self._registered_squares.add(gs_name)
+
+        elif (
+            transferred_file.suffix == ".xml"
+            and transferred_file.name.startswith("GridSquare")
+            and environment
+        ):
+            source = _get_source(transferred_file, environment=environment)
+            if not source:
+                logger.warning(
+                    f"Source could not be identified for {str(transferred_file)}"
+                )
+                return
+
+            gridsquare_dm = source / "Metadata" / f"{transferred_file.parent.name}.dm"
+            for h in entry_points(group="murfey.hooks"):
+                try:
+                    if h.name == "get_gridsquare_dm":
+                        h.load()(
+                            destination_dir=source,
+                            gridsquare_dm=gridsquare_dm,
+                            environment=environment,
+                            token=self._token,
+                        )
+                except Exception as e:
+                    logger.warning(f"Get GridSquare dm hook failed: {e}")