[R-pkg-devel] Functions requiring packages listed on Suggests

[Uwe Ligges]

Simply only run  the function conditionally in test, examples, vignettes:

if(requireNamespace(packageName)){

example / vignette / test code

}




On 08.05.2025 15:37, Juan Antonio Garcia Martin wrote:
> Dear mantainers,
> 
> I have a question, since one of my packages currently does not pass the
> onSuggest special check.
> 
> Two functions of my package require some of the suggested packages
> either in CRAN (DiagrammeR, DiagrammeRsvg and rsvg) or Bioconductor (
> rtracklayer and GenomicRanges), also listed in the suggest section.
> 
> The functions detect whether the suggested packages are installed and
> available, and return an error message indicating that the packages
> required to use the function.
> 
> In fact DiagrammeR uses the same approach, the function export_graph
> requires both DiagrammeRsvg and rsvg, but they are not listed in the
> imports, it just returns a message when they are not installed.
> 
> I have the option of removing the examples, or printing the same
> messages but returning from the functions instead of using stop. What is
> the preferred behavior in these cases?
> 
> Best regards,
> Juan Antonio
> 
> 
> 
> 	
> 
> 	
> 
> 	
> 
> 	
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-package-devel using r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-package-devel