[R-pkg-devel] package dependencies not detected?

[peter dalgaard]

> On 16 Aug 2017, at 11:11 , Berry Boessenkool <berryboessenkool at hotmail.com> wrote:
> 
> 
> Hi,
> 
> 
> if a function in a package uses graphics::legend in the code, but does not import it in the namespace, shouldn't there be a warning in the check?
> 

Er, no... Importing into a namespace is used to avoid the graphics:: qualifier. This is conceptually different from having a dependency.

-pd


> There is not, also not on CRAN (one of my packages did this with stats::density).
> 
> Should I report this to the CRAN team?
> 
> 
> Regards,
> 
> Berry
> 
> 
> Here's a minimal working example using devtools:
> 
> ### install.packages(c("devtools","roxygen2"))
> 
> # create package structure ----
> getwd()
> devtools::create("testPack", description=list(License="GPL (>=2)"))
> setwd("testPack/")
> devtools::check() # everything is fine
> 
> # add function ----
> cat("
> #' @title test function
> #' @description test function
> #' @export
> #' @importFrom graphics plot
> #' @examples testFun(1:6, col=2)
> #' @param x Values
> #' @param args List of arguments passed to legend
> #' @param \\dots Further arguments passed to plot
> #'
> testFun <- function(
>  x,
>  args=list(x='topright', legend=c('A','B'), lty=1),
>  ...
>  )
>  {
>  plot(x, ...)
>  do.call(graphics::legend, args)
>  }
> ", file="R/testFun.R")
> 
> devtools::check() # no problems - even though I only import plot, not legend
> # same thing if I use graphics::legend directly (outside of do.call)
> 
> 
> 	[[alternative HTML version deleted]]
> 
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com