CLI: `page` command building/executing all notebooks

There appears to be an issue with the jupyter-book page command. In principle, page is supposed to convert the given source file into HTML (or pdf, given the option). However, it seems that jb page <file> will actually trigger the execution of the notebooks that are in the same directory.

This can be reproduced with the basic juypter-book example:

jb create spam
cd spam
jb page intro.md

Note that there are two issues here, probably interrelated - 1) page is only supposed to work on a single page rather than the entire book and 2) the default value for executing the books is off, so jb page file should not try to execute the file (if it is a notebook or myst-nb text-formatted notebook).

jupyter-book version: 619e33f2d

[rossbar]

Yeah the jupyter_execute_notebooks value wasn’t making it from the config dictionary through to the myst-nb parser. Based on your changes in #592, I was able to trace the problem back to jupyter_book/yaml.py. I’m still not 100% on the actual mechanics of what is happening, but it seems like the values from the sphinx.config.Config object that is passed into yaml_to_sphinx (at whatever point that’s getting called) are not generally being added to the sphinx_config dict that is then passed along.

I just now think I’ve landed on a potential solution (specific to the jupyter_execute_notebooks config value) and will PR shortly, but based on this fix and changes in #592 , it seems like there may be a more general problem with config values not being passed through the entire build chain intact.

[rossbar]

I’ll aim to address it this evening 😃