[R-pkg-devel] Switch between \dontrun{ } and \donttest{ }.

On 19/10/2023 8:17 p.m., Rolf Turner wrote:

In a package that I maintain, there are examples, in the *.Rd files,
that take an excruciatingly long time to run.  This makes package
checking extremely tedious.  There is no question of errors being
thrown from these examples, they are simply time consuming.  (The
check is being run to look for possible errors elsewhere.)

I therefore would like to wrap these examples in \dontrun{ }.

However when the package is submitted to CRAN, it is expedient to
wrap the examples in \donttest{ } rather than \dontrun{ }.

I would therefore like to find a means of effecting the following
logical structure:

     if(package is being checked by CRAN) {
         Use \donttest{ }
     } else {
         Use \dontrun{ }
     }

Is there a reasonably straightforward means of detecting whether
the package is being checked by CRAN, and thereby setting up such a
logical structure? Perhaps based on environment variables?

Can anyone give me any guidance?  Thanks.

I think the method used by the testthat package is best:  assume it
is being run by CRAN, unless an environment variable named NOT_CRAN
is set to "true" (or some string like that).  Then set the
environment variable at home, where you know you are not on CRAN.

Duncan