Fix #1071. New IFC file version 2X3<->4 upgrader and downgrader IfcPatch recipe

src/ifcpatch/recipes/Migrate.py

@@ -0,0 +1,18 @@
+import ifcopenshell
+import ifcopenshell.util.schema
+
+
+class Patcher:
+    def __init__(self, src, file, logger, args=None):
+        self.src = src
+        self.file = file
+        self.logger = logger
+        self.args = args
+
+    def patch(self):
+        self.new = ifcopenshell.file(schema=self.args[0])
+        migrator = ifcopenshell.util.schema.Migrator()
+        for element in self.file:
+            print("Migrating", element)
+            print("Successfully converted to", migrator.migrate(element, self.new))
+        self.file = self.new