Handle R version requirements expressed with svn revision numbers

[gaborcsardi]

Via @jeroen

> readLines('https://jeroen.github.io/myrepo/PACKAGES')
[1] "Package: test"
[2] "Version: 0.1.0"
[3] "Depends: R (>= r81283)"
[4] "License: GPL (>= 3)"
[5] "MD5sum: 411f63969dc35cd8388e474ed9c2d9f6"
[6] "NeedsCompilation: no"

> pkgcache::repo_add(CRAN = "https://jeroen.github.io/myrepo")
> options(pkg.use_bioconductor = FALSE)
> pak::meta_list()
✔ Updated metadata database: 10.51 kB in 2 files.
ℹ R 4.6 aarch64-apple-darwin23 packages are missing from CRAN: Not Found (HTTP 404).
✔ Updating metadata database ... done
# A data frame: 1 × 23
  package version depends       license md5sum needscompilation repodir rversion
  <chr>   <chr>   <chr>         <chr>   <chr>  <chr>            <chr>   <chr>
1 test    0.1.0   R (>= r81283) GPL (>… 411f6… no               src/co… *
# ℹ 15 more variables: platform <chr>, priority <chr>, ref <chr>, type <chr>,
#   direct <lgl>, status <chr>, target <chr>, mirror <chr>, sources <list>,
#   filesize <int>, sha256 <chr>, sysreqs <chr>, built <chr>, published <dttm>,
#   deps <list>
> pak::pkg_install("test")
Error:
! error in pak subprocess
Caused by error:
! invalid version specification 'r81283'
Type .Last.error to see the more details.