Add path document attribute

jupyter_ydoc/ydoc.py

@@ -39,6 +39,15 @@ def dirty(self, value: bool) -> None:
         with self._ydoc.begin_transaction() as t:
             self._ystate.set(t, "dirty", value)
 
+    @property
+    def path(self) -> None:
+        return self._ystate["path"]
+
+    @path.setter
+    def path(self, value: str) -> None:
+        with self._ydoc.begin_transaction() as t:
+            self._ystate.set(t, "path", value)
+
     @abstractmethod
     def get(self):
         pass
@@ -184,7 +193,7 @@ def set(self, value):
                 self._ymeta.pop(t, key)
             if cells_len:
                 self._ycells.delete_range(t, 0, cells_len)
-            for key in [k for k in self._ystate if k != "dirty"]:
+            for key in [k for k in self._ystate if k not in ("dirty", "path")]:
                 self._ystate.pop(t, key)
 
             # initialize document