[R-pkg-devel] Printing examples conditionally on another package in Suggests

[Alexandre Courtiol]

Hi Zhian,
Could you please explain what behaviour you would like to obtain?
I really don't understand what your problem is from your description...
Alex

On Fri, 10 Aug 2018 at 12:18, Zhian Kamvar <zkamvar using gmail.com> wrote:

> Hello,
>
> I know it's good practice to use
>
> if (require("some_package")) {
>   # some code that needs some_package
> }
>
> In R examples that needs a package listed in Suggests.
>
> The problem with this approach is that if there are any print statements
> within this structure, then they only get printed after the braces and not
> after the lines like so:
>
> if (TRUE) {
>   print("Hi")
>   print("Hello")
>   print("Goodbye")
> }
> #> [1] "Hi"
> #> [1] "Hello"
> #> [1] "Goodbye"
>
> The only way I can think of circumventing this is by replacing the if
> statement with a stopifnot statement:
>
> stopifnot(require("some_package"))
> # some code that needs some_package
>
> But, I'm not sure if that's okay to do in a function example. Does anyone
> have any ideas or suggestions on how to help with this kind of thing?
>
> Cheers,
> Zhian
>
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>
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>


-- 
Alexandre Courtiol

http://sites.google.com/site/alexandrecourtiol/home

*"Science is the belief in the ignorance of experts"*, R. Feynman

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