Simple recipe to merge two IFC files

src/ifcpatch/recipes/MergeProject.py

@@ -0,0 +1,19 @@
+import ifcopenshell
+import ifcopenshell.util.element
+
+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):
+        source = ifcopenshell.open(self.args[0])
+        original_project = self.file.by_type('IfcProject')[0]
+        merged_project = self.file.add(source.by_type('IfcProject')[0])
+        for element in source.by_type('IfcRoot'):
+            self.file.add(element)
+        for inverse in self.file.get_inverse(merged_project):
+            ifcopenshell.util.element.replace_attribute(inverse, merged_project, original_project)
+        self.file.remove(merged_project)