On 17/09/2021 2:55 p.m., Walter, Vonn wrote:
Hi Everyone,
I am developing a package (called mypackage in the text below) that uses
reticulate to call a Python script for computational efficiency. At some point
during the development of the package I read that it would be good to verify
installation of Miniconda. Thus mypackage includes an onLoad.R file that asks
users to either confirm that Miniconda is installed or to proceed with
installation on Miniconda. When I run devtools::check() I get a NOTE related
to my onLoad.R file, and this seems to be causing problems when I submit the
package to CRAN. There are no WARNINGs or ERRORs. Any thoughts would be
greatly appreciated.
The help page ?.onLoad suggests it should normally be silent. Users
might not know which package your message came from, because loading can
happen indirectly, if some other package they requested imports from
yours, for instance.
So if you put your startup message on .onAttach, you probably won't get
the note.
Duncan Murdoch
Thanks,
Vonn
* checking R code for possible problems ... [19s] NOTE
File 'mypackage/R/onLoad.R':
.onLoad calls:
packageStartupMessage("You should install miniconda before using this
package")
See section 'Good practice' in '?.onAttach'.
Here's the code/text from my onLoad.R file:
#' Perform necessary tasks when the mypackage package is loaded
#'
#'
miniconda_installation <- NULL
miniconda_permission <- NULL
numpy_import <- NULL
.onLoad <- function(libname, pkgname)
{
miniconda_installation <- utils::askYesNo("Is miniconda
installed?")
if (isFALSE(miniconda_installation))
{
miniconda_permission <- utils::askYesNo("Install
miniconda? Downloads 50MB and takes time.")
if (isTRUE(miniconda_permission))
{
reticulate::install_miniconda()
} else{
packageStartupMessage("You should install miniconda before using this package")
}
numpy_import <- reticulate::import("numpy",
delay_load = TRUE)
}
}
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