You can now add / remove cost schedules

src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_schedule.py

@@ -0,0 +1,22 @@
+import ifcopenshell.api
+import ifcopenshell.util.date
+from datetime import datetime
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"name": None, "predefined_type": "NOTDEFINED", "start_time": datetime.now()}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        cost_schedule = ifcopenshell.api.run(
+            "root.create_entity",
+            self.file,
+            ifc_class="IfcCostSchedule",
+            predefined_type=self.settings["predefined_type"],
+            name=self.settings["name"],
+        )
+        cost_schedule.UpdateDate = ifcopenshell.util.date.datetime2ifc(datetime.now(), "IfcDateTime")
+        return cost_schedule

src/ifcopenshell-python/ifcopenshell/api/cost/data.py

@@ -0,0 +1,24 @@
+import ifcopenshell.util.date
+
+
+class Data:
+    is_loaded = False
+    cost_schedules = {}
+
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.cost_schedules = {}
+
+    @classmethod
+    def load(cls, file):
+        cls.cost_schedules = {}
+        for cost_schedule in file.by_type("IfcCostSchedule"):
+            data = cost_schedule.get_info()
+            del data["OwnerHistory"]
+            if data["SubmittedOn"]:
+                data["SubmittedOn"] = ifcopenshell.util.date.ifc2datetime(data["SubmittedOn"])
+            if data["UpdateDate"]:
+                data["UpdateDate"] = ifcopenshell.util.date.ifc2datetime(data["UpdateDate"])
+            cls.cost_schedules[cost_schedule.id()] = data
+        cls.is_loaded=True

src/ifcopenshell-python/ifcopenshell/api/cost/remove_cost_schedule.py

@@ -0,0 +1,10 @@
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"cost_schedule": None}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        # TODO: do a deep purge
+        self.file.remove(self.settings["cost_schedule"])