bonsai ifcclash - add separate property for export path

Example - https://i.imgur.com/bCRHx9q.png
Needed so it will be easier to rerun ifc clash without providing the same filepath each time.

src/bonsai/bonsai/bim/module/clash/operator.py

@@ -205,16 +205,12 @@ class ExecuteIfcClash(bpy.types.Operator):
     bl_label = "Execute IFC Clash"
     bl_description = "Execute clash detection and save the information to a .bcf or .json file"
     filter_glob: bpy.props.StringProperty(default="*.bcf;*.json", options={"HIDDEN"})
-    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
+    filepath: bpy.props.StringProperty(subtype="FILE_PATH", options={"SKIP_SAVE"})
 
     def invoke(self, context, event):
-        _, extension = os.path.splitext(self.filepath)
-        if extension != ".bcf":
-            self.filepath = bpy.path.ensure_ext(bpy.data.filepath, ".json")
-        if extension != ".json":
-            self.filepath = bpy.path.ensure_ext(bpy.data.filepath, ".bcf")
-        WindowManager = context.window_manager
-        WindowManager.fileselect_add(self)
+        if self.filepath:
+            return self.execute(context)
+        context.window_manager.fileselect_add(self)
         return {"RUNNING_MODAL"}
 
     def execute(self, context):
@@ -229,6 +225,7 @@ class ExecuteIfcClash(bpy.types.Operator):
         if extension != ".json":
             self.filepath = bpy.path.ensure_ext(self.filepath, ".bcf")
 
+        self.props.export_path = self.filepath
         settings = ifcclash.ClashSettings()
         settings.output = self.filepath
         settings.logger = logging.getLogger("Clash")

src/bonsai/bonsai/bim/module/clash/prop.py

@@ -101,6 +101,11 @@ class BIMClashProperties(PropertyGroup):
     p1: FloatVectorProperty(name="P1", default=(0.0, 0.0, 0.0), subtype="XYZ")
     p2: FloatVectorProperty(name="P2", default=(0.0, 0.0, 0.0), subtype="XYZ")
     active_clash_text: StringProperty(name="Active Clash Text")
+    export_path: StringProperty(
+        name="Export Path",
+        description=".bcf or .json file to export the clash results to",
+        subtype="FILE_PATH",
+    )
 
     @property
     def active_clash_set(self):

src/bonsai/bonsai/bim/module/clash/ui.py

@@ -118,8 +118,12 @@ class BIM_PT_ifcclash(Panel):
 
         row = layout.row()
         row.prop(props, "should_create_clash_snapshots")
+
+        layout.prop(props, "export_path")
+
         row = layout.row()
-        row.operator("bim.execute_ifc_clash")
+        op = row.operator("bim.execute_ifc_clash")
+        op.filepath = props.export_path
 
         row = layout.row()
         row.label(text=f"{len(clash_set.clashes)} Clashes Found", icon="PIVOT_CURSOR")