[R-pkg-devel] R-devel warning: You used a knitr feature that depends on the digest package.

[Martin Maechler]

>>>>> Gábor Csárdi <csardi.gabor at gmail.com>
>>>>>     on Tue, 6 Feb 2018 19:26:55 -0800 writes:

    > codetools is a recommended package, and it is part of most R
    > installations. builder.r-hub.io is a bit more strict, it does have the
    > recommended packages, on some builders at least, so codetools might be
    > missing.

    > Gabor

hmm... but a package maintainer has to also add recommended
packages to 'Suggests' if they are needed in the vignette (e.g.)


    > On Tue, Feb 6, 2018 at 7:22 PM, David Scott <d.scott at auckland.ac.nz> wrote:
    >> On a package I help maintain, we had a note from Kurt about a warning when
    >> building vignettes on R-devel.
    >> 
    >> It was
    >> 
    >> Warning: You used a knitr feature that depends on the digest package.
    >> 
    >> Checking the location of the error and googling it, I am pretty certain it
    >> comes from cache = true for a chunk in the vignette.
    >> 
    >> Adding digest as suggested package, I got no warning from winbuilder using
    >> R-devel, but submitting to https://builder.r-hub.io gave me a new warning
    >> from codetools at the same location as previously. Like digest, codetools is
    >> suggested by knitr.

well, but  "suggests of suggests are not suggests":
If your vignette really needs codetools you (your package
DESCRIPTION) need to suggest it yourself.

    >> Any advice? One thought is just take off cache = true.

well, yes ;-) ..
Seriously, of course rather fix the problem, which must be
fixable relatively easily.

Martin