Implement early testing for serialize operator (not functional)

All the right code seems to be in place, but it seems the package won't go through with the serialize function because of read/write permissions (ERRNO 13)

src/blenderbim/blenderbim/bim/module/brick/__init__.py

@@ -33,6 +33,7 @@ classes = (
     operator.RewindBrickClass,
     operator.ViewBrickClass,
     operator.ViewBrickItem,
+    operator.SerializeBrick,
     prop.Brick,
     prop.BIMBrickProperties,
     ui.BIM_PT_brickschema,

src/blenderbim/blenderbim/bim/module/brick/operator.py

@@ -189,3 +189,10 @@ class RemoveBrick(bpy.types.Operator, Operator):
             library=tool.Ifc.get().by_id(int(props.libraries)) if props.libraries else None,
             brick_uri=props.bricks[props.active_brick_index].uri,
         )
+
+class SerializeBrick(bpy.types.Operator, Operator):
+    bl_idname = "bim.serialize_brick"
+    bl_label = "Serialize Brick"
+
+    def _execute(self, context):
+        core.serialize_brick(tool.Brick)

src/blenderbim/blenderbim/bim/module/brick/ui.py

@@ -58,6 +58,9 @@ class BIM_PT_brickschema(Panel):
         row.operator("bim.add_brick_feed", text="", icon="PLUGIN")
         row.operator("bim.remove_brick", text="", icon="X")
 
+        row = self.layout.row(align=True)
+        row.operator("bim.serialize_brick")
+
         self.layout.template_list("BIM_UL_bricks", "", self.props, "bricks", self.props, "active_brick_index")
 
         for attribute in BrickschemaData.data["attributes"]:

src/blenderbim/blenderbim/core/brick.py

@@ -109,3 +109,6 @@ def remove_brick(ifc, brick, library=None, brick_uri=None):
             ifc.run("library.remove_reference", reference=reference)
     brick.remove_brick(brick_uri)
     brick.run_refresh_brick_viewer()
+
+def serialize_brick(brick, file_name="BlenderBIMSerializeTest.ttl"):
+    brick.serialize_brick(file_name)

src/blenderbim/blenderbim/tool/brick.py

@@ -320,6 +320,12 @@ class Brick(blenderbim.core.tool.Brick):
         BrickStore.VersionedGraphCollection.redo()
         BrickStore.reload_brick_graph()        
 
+    @classmethod
+    def serialize_brick(cls, file_name):
+        BrickStore.reload_brick_graph()
+        print("Serializing: \"" + file_name + "\" ... ")
+        BrickStore.graph.serialize(file_name)
+        print("finished!")
 
 class BrickStore:
     schema = None # this is now a path