Simple button to switch back to classic notebook

[yuvipanda]

Problem

Retrolab is a great alternative to classic notebook, but bugs will still be found. To ease worries about exposing students to these bugs, having a simple way to switch to classic notebook (without having to fiddle with the URL) would be great.

Proposed Solution

A built in toolbar button that lets you switch to classic. This could also switch to lab if needed.

[jtpio]

Thanks @yuvipanda.

Would having the same "Launch Classic Notebook" menu entry as in JupyterLab work?

[yuvipanda]

@jtpio yes! Just on the menubar?

[jtpio]

Just on the menubar?

It would also be available in the command palette.

Because then it would probably be a matter of just @jupyterlab/help-extension as a dependency, and the plugin here:

retrolab/app/index.js

Line 93 in 0f7c026

// @jupyterlab plugins

That would look like the following:

 require('@jupyterlab/help-extension').default.filter(({ id }) =>
  [
    '@jupyterlab/help-extension:launch-classic'
  ].includes(id)
),

[yuvipanda]

@jtpio hmm, so it doesn't seem to open to the currently open notebook - just generically opens classic notebook. Since we have current context, I think we can do better.

[jtpio]

So we can probably add a new plugin to RetroLab for this then.

There is already a plugin to do something similar (installed as a lab extension), but to go from JupyterLab to RetroLab:

retrolab/packages/lab-extension/src/index.ts

Lines 104 to 115 in 0f7c026

	commands.addCommand(CommandIDs.openRetro, {
	label: 'Open in RetroLab',
	execute: () => {
	const current = notebookTracker.currentWidget;
	if (!current) {
	return;
	}
	const { context } = current;
	window.open(`${baseUrl}retro/notebooks/${context.path}`);
	},
	isEnabled
	});