The Rcpp package and some related packages such as RcppArmadillo make use of (local) wrappers around the utils::package.skeleton() function for creating (basic yet functional) packages using Rcpp or RcppArmadillo. RStudio also exposes this under the graphical menu as a nice way to construct a package.
But it seems that something changed quite recently in R. I looked into this a little yesterday and prepared a workaround for Rcpp; Kevin (CC'ed) was more diligent and found what changed with R itself. See the discussion under issue ticket #1087 at the Rcpp repo: https://github.com/RcppCore/Rcpp/issues/1087 The proposed simple PR is at https://github.com/RcppCore/Rcpp/pull/1088 As Kevin mentions in #1087, R itself may have changed, and he even dug up a possible commit [1]. One can illustrate that quickly with two different R interpreters, I use Docker here because that's what I often do. I apologise for the long command-line; that is basically just common Docker arguments. The keys are r-base:3.6.3 and r-base:4.0.0 for selecting the relevant R builds, and the command string passed to bash to call Rscript and package.skeleton() followed by a cat of the NAMESPACE file. ----------------------------------------------------------------------------- edd@rob:/tmp$ mkdir skeleton edd@rob:/tmp$ cd skeleton/ edd@rob:/tmp/skeleton$ docker run --rm -ti -u1000:1000 -v ${PWD}:/mnt -w /mnt r-base:3.6.3 bash -c "Rscript -e 'x <-1L; package.skeleton(name=\"p363\")'; cat p363/NAMESPACE" Creating directories ... Creating DESCRIPTION ... Creating NAMESPACE ... Creating Read-and-delete-me ... Saving functions and data ... Making help files ... Done. Further steps are described in './p363/Read-and-delete-me'. exportPattern("^[[:alpha:]]+") edd@rob:/tmp/skeleton$ docker run --rm -ti -u1000:1000 -v ${PWD}:/mnt -w /mnt r-base:4.0.0 bash -c "Rscript -e 'x <-1L; package.skeleton(name=\"p400\")'; cat p400/NAMESPACE" Creating directories ... Creating DESCRIPTION ... Creating NAMESPACE ... Creating Read-and-delete-me ... Saving functions and data ... Making help files ... Done. Further steps are described in './p400/Read-and-delete-me'. export("x") edd@rob:/tmp/skeleton$ ----------------------------------------------------------------------------- In short, 4.0.0 no longer exports via 'exportPattern("^[[:alpha:]]+")' rendering the new package created non-functional. Was this intentional, or is this a bug we can look into fixing for R 4.0.2 ? Dirk [1] This uses the GitHub mirror rather than svn but the underlying code is of course the same https://github.com/wch/r-source/commit/36b27d951fb355f268191a25909ab292a273932d#diff-a1b94fcea8b8818d4371aabf04dc2b3c -- http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
