On 27/06/2019 9:51 a.m., Duncan Murdoch wrote:
On 26/06/2019 2:54 p.m., Lenth, Russell V wrote:
All,
How does one tell what version of pandoc is being used by winbuilder (and
probably other related CRAN-submission processes)?
The function rmarkdown::pandoc_version() will tell you.
I have a package with several HTML vignettes, for which I use a custom style. I
had decided to add the pandoc option '-strip-comments' to my script (my
vignettes have quite a few HTML comments that are used for indexing and are not
needed after the vignettes are built). When I built the package and submitted
it for checking to winbuilder (for the development version of R), the result
was that each vignette failed to rebuild, with a message that pandoc.exe has no
option -strip-comments. However, that option has been available since pandoc
version 2.0; and its latest version is 2.7.3.
This is not a big deal for my package, so I just removed that option and then
all was OK. But still, why are we having to rely on a relatively ancient
version of pandoc?
It takes work to install a new version, and presumably nobody has done
that work. Pandoc is not easy to build, so some CRAN machines don't
have it at all.
Your DESCRIPTION file should list it in SystemRequirements with the
required version number. I'd suggest using a reasonably low number if
you want CRAN to accept and build your package.
By the way, I just looked through a fairly recent copy of CRAN, and only
3 packages asked for pandoc >= 2.0. So that's a reason it's been a low
priority to install it.
Duncan Murdoch
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