WIP Support asynchronous contents managers

CHANGELOG.md

@@ -1,6 +1,13 @@
 Jupytext ChangeLog
 ==================
 
+1.17.0-dev (2023-??)
+-------------------
+
+**Fixed**
+- Jupytext's contents manager can be derived from asynchronous contents manager (now the default since `jupyter_server==2.0.0`) ([#1020](https://github.com/mwouts/jupytext/issues/1020))
+
+
 1.16.0-dev (2023-10-??)
 -------------------
 

jupyterlab/jupyterlab_jupytext/__init__.py

@@ -21,27 +21,13 @@ def load_jupyter_server_extension(app):  # pragma: no cover
     # The contents manager was set at NotebookApp.init_configurables
 
     # Let's change the contents manager class
-    base_class = app.contents_manager_class
-    if "async" in base_class.__name__.lower():
-        app.log.warning(
-            "[Jupytext Server Extension] Async contents managers like {} "
-            "are not supported at the moment "
-            "(https://github.com/mwouts/jupytext/issues/1020). "
-            "We will derive a contents manager from LargeFileManager instead.".format(
-                base_class.__name__
-            )
-        )
-        from jupyter_server.services.contents.largefilemanager import (  # noqa
-            LargeFileManager,
-        )
-
-        base_class = LargeFileManager
-
     app.log.info(
         "[Jupytext Server Extension] Deriving a JupytextContentsManager "
-        "from {}".format(base_class.__name__)
+        "from {}".format(app.contents_manager_class.__name__)
+    )
+    app.contents_manager_class = build_jupytext_contents_manager_class(
+        app.contents_manager_class
     )
-    app.contents_manager_class = build_jupytext_contents_manager_class(base_class)
 
     try:
         # And rerun selected init steps from https://github.com/jupyter/notebook/blob/

pyproject.toml

@@ -49,6 +49,7 @@ Documentation = "https://jupytext.readthedocs.io"
 # Test related dependencies
 test = [
   "pytest",
+  "pytest-asyncio",
   "pytest-randomly"
 ]
 test-functional = [
@@ -184,6 +185,7 @@ ignore = [
 ]
 
 [tool.pytest.ini_options]
+asyncio_mode = "auto"
 markers = [
     "requires_black",
     "requires_isort",