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

[Zhian Kamvar]

Mainly, I would like to see the value printed after the print statement
like it would appear in a normal R session:

print("Hi")
#> [1] "Hi"
print("Hello")
#> [1] "Hello"
print("Goodbye")
#> [1] "Goodbye"


On Fri, Aug 10, 2018 at 11:28 AM Alexandre Courtiol <
alexandre.courtiol using gmail.com> wrote:

> 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
>>
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-package-devel using r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-package-devel
>>
>
>
> --
> Alexandre Courtiol
>
> http://sites.google.com/site/alexandrecourtiol/home
>
> *"Science is the belief in the ignorance of experts"*, R. Feynman
>

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