You can now import and export IFCCSV to the current file in memory without writing to disk

src/ifcblenderexport/blenderbim/bim/handler.py

@@ -46,6 +46,17 @@ def subscribe_to(object, data_path, callback):
         },
     )
 
+def purge_module_data():
+    from blenderbim.bim import modules
+
+    for module in modules.values():
+        if not module:
+            continue
+        try:
+            getattr(getattr(module, "data"), "Data").purge()
+        except AttributeError:
+            pass
+
 
 @persistent
 def loadIfcStore(scene):
@@ -58,17 +69,7 @@ def loadIfcStore(scene):
     IfcStore.guid_map = (
         {k: bpy.data.objects.get(v) for k, v in json.loads(props.guid_map).items()} if props.id_map else {}
     )
-
+    purge_module_data()
-    # Purge data cache
-    from blenderbim.bim import modules
-
-    for module in modules.values():
-        if not module:
-            continue
-        try:
-            getattr(getattr(module, "data"), "Data").purge()
-        except AttributeError:
-            pass
 
 
 @persistent

src/ifcblenderexport/blenderbim/bim/module/csv/operator.py

@@ -7,6 +7,7 @@ import json
 import webbrowser
 import tempfile
 from blenderbim.bim.ifc import IfcStore
+from blenderbim.bim.handler import purge_module_data
 
 
 class AddCsvAttribute(bpy.types.Operator):
@@ -78,13 +79,19 @@ class ImportIfcCsv(bpy.types.Operator):
     def execute(self, context):
         import ifccsv
 
+        props = context.scene.CsvProperties
+        if props.should_load_from_memory:
+            ifc_file = IfcStore.get_file()
+        else:
+            ifc_file = ifcopenshell.open(props.csv_ifc_file)
         ifc_csv = ifccsv.IfcCsv()
         ifc_csv.output = self.filepath
         if props.csv_delimiter == "CUSTOM":
             ifc_csv.delimiter = props.csv_custom_delimiter
         else:
             ifc_csv.delimiter = props.csv_delimiter
-        ifc_csv.Import(context.scene.CsvProperties.csv_ifc_file)
+        ifc_csv.Import(ifc_file)
+        purge_module_data()
         return {"FINISHED"}
 
 

src/ifccsv/ifccsv.py

@@ -131,8 +131,7 @@ class IfcCsv:
                 results.update([p.Name for p in element.Quantities])
         return ["{}.{}".format(pset_qto_name, n) for n in results]
 
-    def Import(self, ifc):
+    def Import(self, ifc_file):
-        ifc_file = ifcopenshell.open(ifc)
         with open(self.output, newline="", encoding="utf-8") as f:
             reader = csv.reader(f, delimiter=self.delimiter)
             headers = []
@@ -149,7 +148,6 @@ class IfcCsv:
                     if i == 0:
                         continue  # Skip GlobalId
                     element = IfcAttributeSetter.set_element_key(ifc_file, element, headers[i], value)
-        ifc_file.write(ifc)
 
 
 if __name__ == "__main__":
@@ -174,4 +172,6 @@ if __name__ == "__main__":
     elif getattr(args, "import"):
         ifc_csv = IfcCsv()
         ifc_csv.output = args.csv
-        ifc_csv.Import(args.ifc)
+        ifc_file = ifcopenshell.open(args.ifc)
+        ifc_csv.Import(ifc_file)
+        ifc_file.write(args.ifc)