See #3951. IfcCSV now supports list concatenation.

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

@@ -207,6 +207,7 @@ class ExportIfcCsv(bpy.types.Operator):
             empty=props.empty_value,
             bool_true=props.true_value,
             bool_false=props.false_value,
+            concat=props.concat_value,
             sort=sort,
             groups=groups,
             summaries=summaries,

src/blenderbim/blenderbim/bim/module/csv/prop.py

@@ -72,6 +72,7 @@ class CsvProperties(PropertyGroup):
     empty_value: StringProperty(default="-", name="Empty String Value")
     true_value: StringProperty(default="YES", name="True Value")
     false_value: StringProperty(default="NO", name="False Value")
+    concat_value: StringProperty(default=", ", name="Concat Value")
     csv_delimiter: EnumProperty(
         items=[
             (";", ";", ""),

src/blenderbim/blenderbim/bim/module/csv/ui.py

@@ -79,6 +79,8 @@ class BIM_PT_ifccsv(Panel):
             row.prop(props, "true_value")
             row = layout.row()
             row.prop(props, "false_value")
+            row = layout.row()
+            row.prop(props, "concat_value")
             layout.use_property_split = False
 
         blenderbim.bim.helper.draw_filter(self.layout, props, SearchData, "csv")

src/ifccsv/ifccsv.py

@@ -73,6 +73,7 @@ class IfcCsv:
         empty="",
         bool_true="YES",
         bool_false="NO",
+        concat=", ",
         sort=None,
         groups=None,
         summaries=None,
@@ -103,6 +104,8 @@ class IfcCsv:
                     value = bool_true
                 elif value is False:
                     value = bool_false
+                elif isinstance(value, (list, tuple)) and concat is not None:
+                    value = concat.join(map(str, value))
                 result.append(value)
             self.results.append(result)
 
@@ -453,6 +456,7 @@ if __name__ == "__main__":
     )
     parser.add_argument("--bool_true", type=str, default="YES", help="How to represent true values. Defaults to YES.")
     parser.add_argument("--bool_false", type=str, default="NO", help="How to represent false values. Defaults to NO.")
+    parser.add_argument("--concat", type=str, default=", ", help="How to concatenate lists. Defaults to ', '.")
     parser.add_argument("-q", "--query", type=str, default="", help='Specify a IFC query selector, such as "IfcWall"')
     parser.add_argument(
         "-a",
@@ -486,6 +490,7 @@ if __name__ == "__main__":
             empty=args.empty,
             bool_true=args.bool_true,
             bool_false=args.bool_false,
+            concat=args.concat,
             sort=sort,
         )
     elif getattr(args, "import"):

src/ifcopenshell-python/docs/ifccsv.rst

@@ -66,8 +66,8 @@ utility:
 ::
 
     $ python -m ifccsv -h
-    usage: ifccsv.py [-h] -i IFC [-s SPREADSHEET] [-f FORMAT] [-d DELIMITER] [-n NULL] [-e EMPTY] [--bool_true BOOL_TRUE] [--bool_false BOOL_FALSE] [-q QUERY] [-a ATTRIBUTES [ATTRIBUTES ...]] [--headers HEADERS [HEADERS ...]]
+    usage: ifccsv.py [-h] -i IFC [-s SPREADSHEET] [-f FORMAT] [-d DELIMITER] [-n NULL] [-e EMPTY] [--bool_true BOOL_TRUE] [--bool_false BOOL_FALSE] [--concat CONCAT] [-q QUERY] [-a ATTRIBUTES [ATTRIBUTES ...]]
-                     [--sort SORT [SORT ...]] [--order ORDER [ORDER ...]] [--export] [--import]
+                     [--headers HEADERS [HEADERS ...]] [--sort SORT [SORT ...]] [--order ORDER [ORDER ...]] [--export] [--import]
 
     Exports IFC data to and from CSV
 
@@ -87,6 +87,7 @@ utility:
                             How to represent true values. Defaults to YES.
       --bool_false BOOL_FALSE
                             How to represent false values. Defaults to NO.
+      --concat CONCAT       How to concatenate lists. Defaults to ', '.
       -q QUERY, --query QUERY
                             Specify a IFC query selector, such as "IfcWall"
       -a ATTRIBUTES [ATTRIBUTES ...], --attributes ATTRIBUTES [ATTRIBUTES ...]