On 23/07/2020 8:18 a.m., Helmut Schütz wrote:
Hi David,
David Cortes wrote on 2020-07-23 13:16:
It is explained here:
https://cran.r-project.org/web/packages/policies.html
Section about source packages:
"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)."
THX; I missed that! However, the policy continues:
"Limited exceptions may be allowed in interactive sessions if the
package obtains confirmation from the user."
IMHO, this is applicable here (i.e., the user _should_ specify a
directory (as recommended in the man-pages), and only if none is
provided, a warning is issued and confirmation obtained).
If I would use tempdir() and the user forgets to copy the result files
to another location and closes the console, everything would be lost and
the user would have to start again from scratch. I think that this is
not very user-friendly.
I would issue an error instead of a warning, and in the error message,
suggest some code that should work.
Duncan Murdoch
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