[R-pkg-devel] Question regarding listing base and recommended packages programmatically and efficiently

[Thierry Onkelinx]

Dear Tony,

Much will depend on what information you need from the output of
installed.packages()?

Best regards,

ir. Thierry Onkelinx
Statisticus / Statistician

Vlaamse Overheid / Government of Flanders
INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE AND
FOREST
Team Biometrie & Kwaliteitszorg / Team Biometrics & Quality Assurance
thierry.onkelinx using inbo.be
Havenlaan 88 bus 73, 1000 Brussel
www.inbo.be

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Op do 12 okt 2023 om 14:34 schreef Tony Wilkes <tony_a_wilkes using outlook.com>:

> Dear all,
>
> In my R package that I'm developing, I use `installed.packages(priority =
> "base")` to programmatically get all core/base R packages (i.e. base,
> stats, etc.). And similarly, I use installed.packages(priority =
> "recommended")​` to programmatically get the recommended R packages (i.e.
> mgcv, lattice, etc.).
>
> However, CRAN has requested to not use `installed.packages()`, as it is
> slow. I fully get and agree with that assesment. I used
> installed.packages()​` anyway because I could not find a better, fool-proof
> alternative.
>
> Nonetheless, I was asked to change this code for optimalisation. So I
> would like to ask: how do I programmatically get all base/core R packages
> safely and efficiently, but without using `installed.packages()`? And the
> same question for recommended R packages. I have of course Googled it, and
> looked at R's documentation (though R's documentation is large, so it's
> easy to miss something); no solution found. So if any of you has a smart
> idea: I'm all ears.
>
> Thank you in advance.
>
> Kind regards,
>
> Tony.
>
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