Recently I contributed some changes to the pkgdown and downlit packages.
The new pkgdown changes require the new downlit changes in order to
work. These are still both only on Github, in r-lib/pkgdown and
r-lib/downlit respectively.
pkgdown lists downlit in the Imports section of DESCRIPTION, but doesn't
import anything from it: all calls use the :: syntax, e.g.
downlit::highlight.
Clearly pkgdown should add a version dependency to its Imports line
since the old downlit doesn't work. What I was surprised to find was
that R pretty much ignores that line. I can install downlit 0.2.1 from
CRAN, and put
downlit (>= 0.2.1.9000),
into the Imports field in DESCRIPTION, and then install the devel
version of pkgdown without any complaints from R, e.g.
> packageVersion("downlit")
[1] ‘0.2.1’
> install.packages("~/pkgdown_1.6.1.9001.tar.gz", repos=NULL, type =
"source")
* installing *source* package ‘pkgdown’ ...
** using staged installation
** R
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
*** copying figures
** building package indices
** installing vignettes
** testing if installed package can be loaded from temporary location
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary
installation path
* DONE (pkgdown)
> library(pkgdown)
>
The first sign of a problem comes when I try to use the modified function:
> build_reference()
... [ lots deleted ] ...
Error: Failed to parse Rd in build_site.Rd
ℹ unused argument (output_handler =
evaluate::new_output_handler(value = pkgdown_print))
Run `rlang::last_error()` to see where the error occurred.
The problem here is that the "output_handler" argument is new in downlit
0.2.1.9000, and we aren't using that version.
Should R object to the incompatible versions here?
Duncan Murdoch
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