Prepare for Notebook v7

[jtpio]

Opening this draft PR here for visibility, and to use the CI checks to make sure the renaming and other changes are correct. Also because retrolab / notebook 7 still lives in this current repo for now.

Initial steps towards JEP 79: https://jupyter.org/enhancement-proposals/79-notebook-v7/notebook-v7.html

This might be rebased once #319 lands.

Changes

• Rename retrolab to notebook
• Rename to NotebookApp, INotebookShell...
• Update JS packages to @jupyter-notebook scope (Update npm packages to the @jupyter-notebook scope #313)
• Remove notebook server extension
• Drop nbclassic dependency
• Bump version to 7.0.0a0
  • See Question: remove classic notebook server traitlets shim? jupyterlab#11612 for more information about the notebook -> jupyterlab -> nbclassic -> notebook<7 dependency cycle
• Fix UI tests

[github-actions]

👈 Launch a Binder on branch jtpio/retrolab/notebook-repo

[jtpio]

Since jupyterlab still depends on nbclassic at the moment we are getting the following error:

ImportError: cannot import name 'DEFAULT_STATIC_FILES_PATH' from 'notebook' (/home/runner/work/retrolab/retrolab/notebook/__init__.py)

From https://github.com/jupyterlab/retrolab/runs/4867923562?check_suite_focus=true

[Zsailer]

Let's add notebook_shim to this PR to replace nbclassic.

[jtpio]

Let's add notebook_shim to this PR to replace nbclassic.

Done in 2435634

[jtpio]

Next step will be to get jupyterlab/jupyterlab#11894 merged in JupyterLab, and released in 4.0.0ax so it can be consumed here in this PR.

[jtpio]

This class needs to be named something else than NotebookApp.

Otherwise the traits translation provided by notebook_shim would try to convert for example NotebookApp.collaborative to ServerApp.collaborative, but collaborative does not exist on ServerAppbut onLabApp`.

$ jupyter notebook --no-browser
[C 2022-02-25 10:12:36.754 LabApp] Bad config encountered during initialization: Trait, expose_app_in_browser, not found.

cc @Zsailer to double check this is fine, which I believe it should, since JupyterNotebookApp inherits from ServerApp.

[jtpio]

This can be tested on Binder: https://mybinder.org/v2/gh/jtpio/retrolab/notebook-repo?urlpath=tree

The jupyter notebook command (default of `repo2docker) will now launch a Jupyter Server, and not the Classic Notebook Server anymore.

notebook-binder.mp4

[jtpio]

cc @Zsailer if you would like to do a first round of review (or anyone else interested).

Some UI tests are still a bit flaky (#341).

I'm also planning to finish #352 first, and integrate the changes here.

Then this branch (https://github.com/jtpio/retrolab/tree/notebook-repo) should be ready to be integrated in https://github.com/jupyter/notebook. There will still be some things to fix like the merge with existing files (readme, changelog...) but we can iterate there then. Hoping to open the PR in https://github.com/jupyter/notebook/ some time next week.

[jtpio]

Closing since the corresponding PR has been opened on the notebook repo: jupyter/notebook#6294