added list of tlmgr packages to install as data

[ttimbers]

Based on the conversation in #228 I am submitting this pull request to add a data object named jup_pkgs so that the additional packages required for using {tinytex} with Jupyter can be installed via:

tinytex::install_tinytex(extra_packages = tinytex::jup_pkgs)

A couple of notes:

• A separate doc PR will need to be sent to yihui/yihui.org to communicate that this exists and how to install {tinytex} to get these packages installed. Can you point me to where you would like this added there in the {tinytex} docs?
• I am not sure if/how tests should be made for this contribution. Suggestions/direction welcome.
• What if folks wanted this for Jupyter only, similar to folks who might use the For Other Users approach? Where should I add this list of packages to make this work? I guess an optional bash shell argument for the tools/install-unx.sh script would work for example?

[yihui]

• I am not sure if/how tests should be made for this contribution. Suggestions/direction welcome.

Don't worry about it. I don't care in this case.

Thanks!

[yihui]

I don't want to introduce the dependency on usethis only for the purpose of saving a simple vector to .rda and documenting it. I prefer not exporting or documenting jup_pkgs here. That means users will need to use :::, which I think is fine. This is not a super important object anyway.

That said, it will be good to briefly mention it on the TinyTeX documentation site, e.g. after FAQ 12: https://yihui.org/tinytex/faq/

An alternative approach is like this: https://github.com/yihui/tinytex/blob/b84fd550ffb72a8f20d323144fe269f4a5173c9a/R/install.R#L342-L346 i.e. save the list of packages under tools/pkgs-jupyter.txt, so both the R function and the shell script can read it.

[ttimbers]

I was curious as to whether adding usethis::use_data_raw() would mean that it needed to be added as a dev dependency. So I queried Allison Hill on this. She said that "The scripts in data_raw/ are for you. They are your way of creating the package but that directory is added to your .Rbuildignore when you set it up with usethis" (see Twitter conversation here). So in general it seems that technically this does not make usethis a dev dependency. However, I am happy to defer to your preferred way to do this. Another advantage of doing something like install_yihui_pkgs with a the list of packages in tools/pkgs-jupyter.txt is that, as you mentioned, the shell script can read it.

Once you confirm this is for sure the way you want to go, I will change to PR to reflect it.

[yihui]

Yes, please store the list of packages in tools/pkgs-jupyter.txt, and remove the dependency on usethis. Thank you!

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