How do fetch notebook or current file path for a jupyterlab extension the way the `Rename` widget does?

[luis-chaves-visa]

The Rename action that appears when a user right-clicks a notebook name on the tab section

displays the path of the current file:

I was wondering how it does that, I'd like to replicate that functionality for my extension, I've browsed through jupyterlab's source code but wasn't able to find an answer.

[fcollonval]

@luis-chaves-visa usually an user interaction is linked to triggering a command (like when a user click a menu entry, press shortcut keys, click on simple toolbar buttons,...). That said it may not be easy to find which one.

A good place to look for is the latest version of the documentation that list all available commands: https://jupyterlab.readthedocs.io/en/latest/user/commands.html

In the case of the rename action, the command is docmanager:rename. And its implementation is at https://github.com/jupyterlab/jupyterlab/blob/7b57518f284fea3ceeb0479352897c720779500d/packages/docmanager-extension/src/index.tsx#L918

The code logic is:

• Get the context of the widget that is linked to the context menu
• From the context you can get the path, see for example the code of the rename dialog: https://github.com/jupyterlab/jupyterlab/blob/912aceb5a0a08fda578375567b6b2fee936d86c4/packages/docmanager/src/dialogs.ts#L40