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

[Juan Antonio García Martín]

Thank you for answering so soon, Michael and Uwe.

I think I will follow Uwe's approach, it is simple and will work on all cases. 

Best regards, 
Juan Antonio 



On May 8, 2025 6:24:34 PM GMT+02:00, Uwe Ligges <ligges using statistik.tu-dortmund.de> wrote:
>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
>> 
>> 
>> 
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>

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