Allow extra_keys as an argument when using a pre-commit hook

[likewei92]

Current extrakeys is only configurable through git config (--global) filter.nbstripout.extrakeys. It would be great if we can configure this when using nbstripout as part of a pre-commit hook as well!

[kynan]

Just to double check: do you mean pass those in as a command line argument like --extra-keys ?

[likewei92]

@kynan sorry for the delayed reply - I meant being able to specify extrakeys in .pre-commit-config.yaml, though I think if you supported it in the command line you would be able to specify it in the yaml file as well (through args)

[kynan]

Thanks, I'll have a look whether we want to support either or both.

[kynan]

Can you give me some examples of extra keys you want to pass on the command line? And do you have an example notebook I could use to test?

[kynan]

I've implemented --extra-keys. You can use them with pre-commit e.g. as follows:

repos:
- repo: https://github.com/kynan/nbstripout
  rev: fe88889c2a68efebd48a3bf8fe909b6788d62305
  hooks:
    - id: nbstripout
      args: [--extra-keys=metadata.celltoolbar]

Feel free to reopen if this doesn't meet your needs.

[likewei92]

That works, thanks!