Pluggable custom formatters

For now the different formatters run in process by importing the Python modules directly. For example:

https://github.com/ryantam626/jupyterlab_code_formatter/blob/ca74872e842ac20e4c9086eb8d008243942e824c/jupyterlab_code_formatter/formatters.py#L75-L78

It would be interesting if we could have them also be pluggable using the notebook server config:

c.JupyterLabCodeFormatter.extra_formatters = {
     "custom": CustomFormatter(),
}

That could be also useful for #24, so users could provide their own formatters if they are not available by default.

[ryantam626]

@marctorsoc for now, you woul need to hard code them in the jupyter config file (and restart the jupyter server for this to take effect).

[marctorsoc]

Hi @ryantam626, how can I pass options to my custom formatter?