For what it's worth, the recommendation to use `tempfile()` is very confusing to R users.
Often users (particularly new users) jump directly to examples when reading documentation and when you have these more complicated examples they do not realize they can just use a simple string literal. See https://github.com/tidyverse/readr/issues/635 for an issue where multiple users explicitly request examples which do _not_ use `tempfile()`. On Fri, May 3, 2019 at 7:59 PM Duncan Murdoch <murdoch.dun...@gmail.com> wrote: > > On 03/05/2019 6:33 p.m., Jarrett Phillips wrote: > > Hello, > > > > My R package has a function with an argument to specify whether numerical > > results should be outputted to a CSV file. > > > > CRAN policy stipulates verbatim that > > > > Packages should not write in the user’s home filespace (including > > clipboards), nor anywhere else on the file system apart from the R > > session’s temporary directory (or during installation in the location > > pointed to by TMPDIR: and such usage should be cleaned up). Installing into > > the system’s R installation (e.g., scripts to its bin directory) is not > > allowed. > > > > I know I should use tempdir() within my package function, but I've not seen > > any examples on how this is best done within existing R packages. > > > > Within my package documentation examples for my function, I have the lines: > > > > \dontshow{.oldwd <- setwd(tempdir())} > > > > ... some R code ... > > > > \dontshow{setwd(.oldwd)} > > > > but I have been informed that this is not the accepted way. > > > > Any ideas from the community on how do do this properly? > > Use the tempfile() function to generate a filename in the temporary > directory. You might want to use the "pattern" or "fileext" arguments, > but don't change the "tmpdir" argument. > > Then write to that file. > > For example, > > filename <- tempfile(fileext = ".csv") > write.csv(df, filename) > > It's a good idea to clean up afterwards using > > unlink(filename) > > ______________________________________________ > R-package-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-package-devel ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel