[R-pkg-devel] Checking package dependencies before loading namespace
Duncan Murdoch
murdoch@dunc@n @end|ng |rom gm@||@com
Tue Aug 31 23:33:52 CEST 2021
People shouldn't be able to install your package unless the "hard"
dependencies are available.
If EBImage isn't essential to your package, you should make it a "soft"
dependency by listing it in Suggests and checking for it every time you
use it.
Duncan Murdoch
On 31/08/2021 3:20 p.m., Tiago Olivoto wrote:
> Dear all,
> I have a package called pliman <https://CRAN.R-project.org/package=pliman>
> which depends on the Bioconductor package EBImage.
>
> When running install.packages("pliman") I get the following warning
>
> Warning in install.packages : dependency ‘EBImage’ is not available
>
> and thus when loading the package with library(pliman), the following error
> occurs
>
> Erro: package or namespace load failed for ‘pliman’ in loadNamespace(i,
> c(lib.loc, .libPaths()), versionCheck = vI[[i]]):
> there is no package called ‘EBImage’
>
> I created a check function to check if EBImage is available and if not, ask
> users if they want to install it
>
> ---
> check_ebi <- function(){
> if(!requireNamespace("EBImage", quietly = TRUE)) {
> inst <-
> switch(menu(c("Yes", "No"), title = "Package {EBImage} required but not
> available.\nDo you want to install it now?"),
> "yes", "no")
> if(inst == "yes"){
> if (!requireNamespace("BiocManager", quietly = TRUE)){
> install.packages("BiocManager")
> }
> BiocManager::install("EBImage", ask = FALSE, update = FALSE)
> } else{
> message("To use {pliman}, first install {EBImage} with
> 'BiocManager::install(\"EBImage\")'.")
> }
> }
> }
> ---
>
> Is there any way to run this function prior to namespace loading? I tried
> putting check_ebi() into .onLoad() but the same error occurs.
>
> Thanks in advance for any suggestions.
> Tiago
>
> [[alternative HTML version deleted]]
>
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