Multiple outputs for e.g. webpdf, pandoc

[bollwyvl]

Hey folks!

Over on conda-forge/staged-recipes#12516 (comment) we've been chatting about the tradeoffs of offering a jupyter-book-webpdf, which would be somewhat simpler if there was an nbconvert-webpdf which already carried the pyppeteer pin, beyond what run_constrained would do.

However we solve it over there, we could take the opportunity to offer, a la matplotlib[-base]

• nbconvert-core (which could be noarch: python) that still carried all the run_constrained pieces, but was lighter-weight and -featured (pandoc should be an optional, not required, dependency #24)
• nbconvert that actually required pandoc, and therefore could not be noarch: python, for now
• nbconvert-webpdf that acutally required pyppeteer, and could actually also be noarch: python

It would take a while (or maybe a migration) to get everything that didn't specifically need the pandoc capability to use -core, but eventually, maybe, (more) people could be happy(er).

I'm happy to work up a PR if people think this is a good idea.

[ocefpaf]

I don't have strong opinions about this but I'd love to get the input from the upstream devs of nbconvert. (I'm guessing you are one of them, right?)

Can you bring this up with them and get their opinion on this?

[bollwyvl]

From the nbconvert issue, we've got one 👍 from the most active maintainer... we can let it cook for a while, but i can knock together a wip PR...

[ocefpaf]

If the most active maintainer is happy, go for it!

[bollwyvl]

Welp, here we go: #47