[Rd] tools:: extracting pkg dependencies from DCF

Jan Netík net|kj@ @end|ng |rom gm@||@com
Fri Oct 14 16:14:01 CEST 2022

Hello Jan,

I have seen many packages that implemented dependencies "extraction" on
their own for internal purposes and today I was doing exactly that for
mine. It's not a big deal using read.dcf on DESCRIPTION. It was sufficient
for me, but I had to take care of some \n chars (the overall returned value
has some rough edges, in my opinion). However, the function from the branch
seems to not care about version requirements, which are crucial for me.
Maybe that is something to reconsider before merging.


pá 14. 10. 2022 v 2:27 odesílatel Jan Gorecki <j.gorecki using wit.edu.pl> napsal:

> Dear R devs,
> I would like to raise a request for a simple helper function.
> Utility function to extract package dependencies from DESCRIPTION file.
> I do think that tools package is better place, for such a fundamental
> functionality, than community packages.
> tools pkg seems perfect fit (having already great function write_PACKAGES).
> Functionality I am asking for is already in R svn repository since 2016, in
> a branch tools4pkgs. Function is called 'packages.dcf'.
> Another one 'repos.dcf' would be a good functional complementary to it.
> Those two simple helper functions really makes it easier for organizations
> to glue together usage of their own R packages repos and CRAN repo in a
> smooth way. That could possibly help to offload CRAN from new submissions.
> gh mirror link for easy preview:
> https://github.com/wch/r-source/blob/tools4pkgs/src/library/tools/R/packages.R#L419
> Regards
> Jan Gorecki
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