use_msrv()

[kbvernon]

This enables setting MSRV in DESCRIPTION SystemRequirements from R.

It is part of the push for a CRAN release: #362.

[etiennebacher]

As discussed on discord, I think there could be more details on the relationship between the MSRV and the CRAN version. Here are a couple of comments, I hope it helps

[JosiahParry]

I think the last thing that this needs is a snapshot test. Do you think you can do that?

For example the test would be created using usethis::use_test("use_msvr")

test_that("use_msrv() modifies the MSRV in the DESCRIPTION", {
  skip_if_not_installed("usethis")

  path <- local_package("testpkg")
  # capture setup messages
  withr::local_options(usethis.quiet = FALSE)
  use_extendr(path, quiet = TRUE)
  use_msrv("1.70")

  expect_snapshot(cat_file("DESCRIPTION"))
})

[JosiahParry]

Assuming the linter is finally satisfied this is ready to be merged!

[etiennebacher]

@JosiahParry Coming a bit late after this got merged but could you include the table you published on Mastodon about the R version and platforms on CRAN and the associated Rust version? I think it would fit either in the doc of this function or in the vignette about CRAN

[JosiahParry]

I think the problem with that is that we don't know when the rust versions will change and it may be that the table is out of date already. I did make an issue for the extendr website to report the CRAN versions which I think would be a more appropriate place for them extendr/extendr.github.io#40

[etiennebacher]

Yes, I see the problem of this getting outdated. It could be that a simple CI script runs weekly to update it. But anyway, I just wanted to be sure this was tracked somewhere :)

[JosiahParry]

Yes, I see the problem of this getting outdated. It could be that a simple CI script runs weekly to update it. But anyway, I just wanted to be sure this was tracked somewhere :)

We ought to add a CRAN Support section in the user guide where this could be reported. It could be a better version of https://extendr.github.io/rextendr/dev/articles/cran-compliance.html