implement file auto-save

Author: dlqqq

jupyter_rtc_core/rooms/yroom.py

@@ -312,13 +312,12 @@ def write_sync_update(self, message_payload: bytes, client_id: str | None = None
 
         This method can also be called manually.
         """
-        # Broadcast the message:
+        # Broadcast the message
         message = pycrdt.create_update_message(message_payload)
         self._broadcast_message(message, message_type="SyncUpdate")
 
-        # Save the file to disk.
-        # TODO: requires YRoomLoader implementation
-        return
+        # Save the file to disk
+        self.file_api.schedule_save()
 
 
     def handle_awareness_update(self, client_id: str, message: bytes) -> None:

jupyter_rtc_core/rooms/yroom_file_api.py

@@ -178,6 +178,7 @@ async def _process_scheduled_saves(self) -> None:
                 file_format = self.file_format
                 file_type = self.file_type if self.file_type in SAVEABLE_FILE_TYPES else "file"
 
+                # Save the YDoc via the ContentsManager
                 await ensure_async(self._contents_manager.save(
                     {
                         "format": file_format,
@@ -186,6 +187,10 @@ async def _process_scheduled_saves(self) -> None:
                     },
                     path
                 ))
+
+                # Mark 'dirty' as `False`. This hides the "unsaved changes" icon
+                # in the JupyterLab tab rendering this YDoc in the frontend.
+                self.jupyter_ydoc.dirty = False
             except Exception as e:
                 self.log.error("An exception occurred when saving JupyterYDoc.")
                 self.log.exception(e)