Check for '%s' in prompt template

[fcollonval]

This fixes #442.

@mgeier yes this was what I meant. Here is a proposal.

[mgeier]

Thanks, I think this would work. There can be a few theoretical edge cases where this wouldn't work, but I think nothing that's problematic in practice.

But ... is this feature really necessary?

You were suggesting this in #442 because you wanted to use it to remove the prompts.
However, this is not a good way to remove the prompts anyway. If you want to remove the prompts, you should use something like that: https://nbsphinx.readthedocs.io/en/latest/custom-css.html

Is there any other situation where this PR would be needed?

[fcollonval]

Good question indeed. The only case I see is if the user wants to print something generic like "In" and "Out" next to each cells. But is it really useful... no sure. So I let you judge on this one and if you choose to simply close this, not problem for me (less trick, less bugs 😉 - especially if you already have some edge cases in mind.)

[mgeier]

The only case I see is if the user wants to print something generic like "In" and "Out" next to each cells. But is it really useful... no sure.

I don't think so.

If you don't need it, there is no reason to implement this right now.

If anybody needs this at some point (which I don't think will happen), we can merge it then.

less trick, less bugs

Very true!

especially if you already have some edge cases in mind.

Those are only very vague edge cases ... a user might use different placeholders instead of %s. For example %r. Or %x if they want hexadecimal numbers!

[mgeier]

I'm closing this for now, but if a real use case comes up, please let me know!