Add QUARTO_KNITR_RSCRIPT_ARGS to pass some flags to RScript for knitr engine

[cderv]

e.g --max-connections=258 available in R 4.4, or --vanilla

Args should be passed a comma separated list of flags.

This is for expert use and there is not check done on the argument being support by RScript or not.

[cscheid]

Setting environment variables like this is risky - environment variables are global options and we can have tests running in parallel. In that case, the environment variables might end up being changed for tests other than this one.

[cderv]

Setting environment variables like this is risky

You mean for the added feature or for the test only ?

For the feature it seems ok to do it like this, as we discussed. Did you have another solution in mind ?

I assume you are talking about the tests.

environment variables are global options and we can have tests running in parallel. In that case, the environment variables might end up being changed for tests other than this one.

I discovered that working on other tests this week where I wanted to use QUARTO_PROFILE and I couldn't make it work. However, my understanding was it was a per test file problem, and that it would not impact other tests in other files.

But from your comment I assume I am wrong. I understand now that we can't really do this at all because deno test can run several test files, and their tests in parallel in same environment ?

I did it initially in #11245 some time ago but discovered this week the possible drawback trying to using QUARTO_PROFILE

Does this mean can't test anything that really on environment variable setting because of asynchronous behavior and that everything works in same environment ?

To understand if I should just remove the test or try to adapt somehow...

[cscheid]

I assume you are talking about the tests.

Yes, that's what I was talking about.

[cderv]

So let's just remove those tests then.

I didn't find a great way to tweak environment variable for a single test only.

[cderv]

They could be added back as part of tests that we run with bundled versions. We know we need to run some already.

Or something I did not try... leveraging Quarto project and _environment file ! I'll try that maybe before we merge this.