api usecase to re order related objects in a nest

src/ifcopenshell-python/ifcopenshell/api/nest/reorder_nesting.py

@@ -0,0 +1,36 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2021-2022 Dion Moult <dion@thinkmoult.com>, Yassine Oualid <yassine@sigmadimensions.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+
+class Usecase:
+    def __init__(self, file, item=None, old_index=0, new_index=0):
+        """Reorders an item in a nesting set"""
+        self.file = file
+        self.settings = {"item": item, "old_index":old_index, "new_index": new_index}
+
+    def execute(self):
+        if not self.settings["item"].Nests:
+            return
+        nesting_set = self.settings["item"].Nests[0]
+        if not self.settings["old_index"]:
+            old_index = nesting_set.RelatedObjects.index(self.settings["item"])
+        else:
+            old_index = self.settings["old_index"]
+        items = list(getattr(nesting_set, "RelatedObjects") or [])
+        items.insert(self.settings["new_index"], items.pop(old_index))
+        setattr(nesting_set, "RelatedObjects", items)