Add async contents manager support

jupyterlab/jupyterlab_jupytext/__init__.py

@@ -1,13 +1,6 @@
 """Jupyter server and lab extension entry points"""
 
-import asyncio
-
-from jupytext.reraise import reraise
-
-try:
-    from jupytext.contentsmanager import build_jupytext_contents_manager_class
-except ImportError as err:
-    build_jupytext_contents_manager = reraise(err)
+from jupytext.contentsmanager import build_jupytext_contents_manager_class
 
 
 def load_jupyter_server_extension(app):  # pragma: no cover
@@ -22,20 +15,7 @@ def load_jupyter_server_extension(app):  # pragma: no cover
     # The server extension call is too late!
     # The contents manager was set at NotebookApp.init_configurables
 
-    # If possible, we derive a Jupytext CM from the current CM
     base_class = app.contents_manager_class
-    if asyncio.iscoroutinefunction(base_class.get):
-        app.log.warning(
-            f"[Jupytext Server Extension] Async contents managers like {base_class.__name__} "
-            "are not supported at the moment "
-            "(https://github.com/mwouts/jupytext/issues/1020). "
-            "We will derive a contents manager from LargeFileManager instead."
-        )
-        from jupyter_server.services.contents.largefilemanager import (  # noqa
-            LargeFileManager,
-        )
-
-        base_class = LargeFileManager
 
     app.log.info(
         "[Jupytext Server Extension] Deriving a JupytextContentsManager "

pyproject.toml

@@ -33,6 +33,7 @@ classifiers = [
 ]
 dependencies = [
     "nbformat",
+    "jupyter_server",
     "mdit-py-plugins",
     "markdown-it-py>=1.0",
     "packaging",
@@ -50,6 +51,7 @@ Documentation = "https://jupytext.readthedocs.io"
 # Test related dependencies
 test = [
   "pytest",
+  "pytest-asyncio",
   "pytest-xdist",
   "pytest-randomly"
 ]
@@ -205,6 +207,7 @@ markers = [
     "requires_ir_kernel",
     "skip_on_windows",
     "pre_commit",
+    "asyncio"
 ]
 filterwarnings = [
     # Uncomment this "error" to turn all unfiltered warnings into errors

src/jupytext/__init__.py

@@ -1,20 +1,13 @@
 """Read and write Jupyter notebooks as text files"""
 
+from .contentsmanager import (
+    TextFileContentsManager,
+    build_jupytext_contents_manager_class,
+)
 from .formats import NOTEBOOK_EXTENSIONS, get_format_implementation, guess_format
 from .jupytext import read, reads, write, writes
-from .reraise import reraise
 from .version import __version__
 
-try:
-    from .contentsmanager import build_jupytext_contents_manager_class
-except ImportError as err:
-    build_jupytext_contents_manager_class = reraise(err)
-
-try:
-    from .contentsmanager import TextFileContentsManager
-except ImportError as err:
-    TextFileContentsManager = reraise(err)
-
 __all__ = [
     "read",
     "write",