Add Jupyterlab GridStack

[jtpio]

Add the jupyterlab-gridstack extension from https://github.com/hbcarlos/voila-editor

TODO

• Bring the original commits
• Change outputDir to voila-gridstack/labextension
• Check setup.py is still correct after the switch to jupyter-packaging
• Add tests on CI to check both the classic and lab extensions are correctly installed
• Keep the symlink of template data files?
• Rename lab extension to @voila-dashboards/jupyterlab-gridstack
• Update to the latest jupyter_server.pytest_plugin -> tracked in Update the tests to work with the latest jupyter server #70

[jtpio]

How about naming the JupyterLab Extension @voila-dashboards/jupyterlab-gridstack?

We know have the voila-dashboards organization on npm:

Similarly, we could rename @jupyter-voila/jupyterlab-preview to @voila-dashboards/jupyterlab-preview to stay consistent, and also so it matches the name of the org on GitHub.

[jtpio]

Sticking to this for now since a recent version of jupyter_server changed the names of some pytest fixtures.

[jtpio]

After a fresh install in a new environment:

$ jupyter labextension list
JupyterLab v3.0.0rc13
/home/jtp/miniforge3/envs/test/share/jupyter/labextensions
        @jupyter-widgets/jupyterlab-manager v3.0.0-alpha.2 enabled OK
        @voila-dashboards/jupyterlab-gridstack v0.1.0 enabled OK (python, voila-gridstack)

@voila-dashboards/jupyterlab-gridstack v0.1.0 enabled OK (python, voila-gridstack)

This comes from the install.json file that tells the user the @voila-dashboards/jupyterlab-gridstack extension was installed via the voila-gridstack python package.

[jtpio]

There might be a better way to handle this, so the symlinks to the template files are correctly created in development mode.

[jtpio]

cc @hbcarlos @SylvainCorlay if you want to check it out.

This should be ready to go. jupyterlab_widgets is still in the list of install_requires (but not jupyterlab), so support for widgets in the editor works out of the box. This should also prevent the issue of a missing sharedPackages dependency if jupyterlab_widgets is not installed, but specified here:

voila-gridstack/packages/jupyterlab-gridstack/package.json

Lines 74 to 83 in 27a8402

	"sharedPackages": {
	"@jupyter-widgets/base": {
	"bundled": false,
	"singleton": true
	},
	"@jupyter-widgets/jupyterlab-manager": {
	"bundled": false,
	"singleton": true
	}
	}

Just opened #70 to track the remaining item:

Update to the latest jupyter_server.pytest_plugin

[hbcarlos]

Just tried and works perfectly. Thanks Jeremy!

[jtpio]

The last commit updates to the latest JupyterLab 3.0 final packages.

We should be able to merge this PR, and proceed with a release soon.

[jtpio]

We should be able to merge this PR, and proceed with a release soon.

Opened #72 to track this.