bim.purge_hdf5_cache to skip currently loaded cache

Previously it would fail with:
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'bonsai\\bim\\data\\cache\\988c190483ae6bab7cf6b00cee78694d.h5'

src/bonsai/bonsai/bim/module/debug/operator.py

@@ -440,9 +440,11 @@ class SelectExpressFile(bpy.types.Operator):
 class PurgeHdf5Cache(bpy.types.Operator):
     bl_idname = "bim.purge_hdf5_cache"
     bl_label = "Purge HDF5 Cache"
+    bl_description = "Clean up HDF5 cache files except the ones that currently loaded"
 
     def execute(self, context):
         core.purge_hdf5_cache(tool.Debug)
+        self.report({"INFO"}, "HDF5 cache purged.")
         return {"FINISHED"}
 
 

src/bonsai/bonsai/tool/debug.py

@@ -44,7 +44,10 @@ class Debug(bonsai.core.tool.Debug):
         cache_dir = os.path.join(bpy.context.scene.BIMProperties.data_dir, "cache")
         filelist = [f for f in os.listdir(cache_dir) if f.endswith(".h5")]
         for f in filelist:
-            os.remove(os.path.join(cache_dir, f))
+            try:
+                os.remove(os.path.join(cache_dir, f))
+            except PermissionError:
+                pass
 
     @classmethod
     def debug_geometry(

src/bonsai/test/tool/test_debug.py

@@ -57,5 +57,10 @@ class TestPurgeHdf5Cache(NewFile):
         test_file = cache_dir / "test.h5"
         test_file.parent.mkdir(parents=True, exist_ok=True)
         test_file.touch()
+
+        # Ensure it can skip currently loaded cache.
+        loaded_file_path = test_file.with_stem("test_loaded")
+        loaded_file = open(loaded_file_path, "w")
+
         subject.purge_hdf5_cache()
-        assert not [f for f in cache_dir.iterdir() if f.suffix == ".h5"]
+        assert [f for f in cache_dir.iterdir() if f.suffix == ".h5"] == [loaded_file_path]