Improve performance of jupyterlab-quickopen

[dclong]

I love the extension jupyterlab-quickopen. It's (potentially) resolves server issues that I opened in jupyterlab repository. jupyterlab/jupyterlab#3246 is resolved by this extension. jupyterlab/jupyterlab#5056 and jupyterlab/jupyterlab#5481 are probably no longer needed with this extension.

However, I do see performance issues when there are lots of files in the JupyterLab work directory. It also significantly increase the launch time of JupyterLab server when there are lots of files.

[bobmayuze]

One thing I found helpful is excluding some files. Try this

[dclong]

Maybe it makes things more convenient to allow specifying include pattern?

[dclong]

It is possible to delay the indexing of jupyterlab-quickopen after launching the jupyterlab server? Slowing down launching of JupterLab server is a hard no to me.

[parente]

@dclong The scan operation is only performed when a get is performed: https://github.com/parente/jupyterlab-quickopen/blob/ca55830e460be6f934d83642425c073d3e2fc284/jupyterlab_quickopen/handler.py#L81

I've not seen the slow down when jupyterlab opens myself. I'll be happy to review a pull request if you are able to debug the problem and submit a fix.

[machow]

In case anyone is running into this now--it looks like there is an undocumented relativeSearch setting. If you set it to true, then it will search from the folder you have opened in jupyter lab. Really enjoying the extension!

You can set it using the settings instruction in the README.