R devel - Jun 2019 - making a vignette optional

I had added a vignette to the coxme package and all worked well locally, but it
failed at
CRAN.???? The issue is that the vignette involves using coxme for pedigree data,
it
doesn't work without the kinship2 package, and I hadn't put in the
necessary "if
(require(...." logic.

The question is, how do I make the entire vignette conditional? If the package
isn't
available, there is nothing to run.? The latex itself will fail when it
can't find the
figures? (I float them), and the parts that don't will end up as inane
discussion of
material that isn't there.

Terry T.



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On Tue, 18 Jun 2019 at 19:03, Therneau, Terry M., Ph.D. via R-devel
<r-devel at r-project.org> wrote:
>
> I had added a vignette to the coxme package and all worked well locally,
but it failed at
> CRAN.     The issue is that the vignette involves using coxme for pedigree
data, it
> doesn't work without the kinship2 package, and I hadn't put in the
necessary "if
> (require(...." logic.
>
> The question is, how do I make the entire vignette conditional? If the
package isn't
> available, there is nothing to run.  The latex itself will fail when it
can't find the
> figures  (I float them), and the parts that don't will end up as inane
discussion of
> material that isn't there.
This is what I do in my packages:
https://github.com/r-simmer/simmer/blob/master/vignettes/simmer-08-philosophers.Rmd#L21

If SweaveOpts accept code in the same way, you can set something like

\SweaveOpts{eval=requireNamespace("kinship2", quietly=TRUE)}

I?aki