[R] readline in function call with space in prompt.

[Michael Dewey]

The function test as defined below by Jeremie works as I would have 
expected for me on Windows so I am unable to replicate the problem there.

R version 4.0.3 (2020-10-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19041)

Matrix products: default

locale:
[1] LC_COLLATE=English_United Kingdom.1252
[2] LC_CTYPE=English_United Kingdom.1252
[3] LC_MONETARY=English_United Kingdom.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United Kingdom.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] compiler_4.0.3


On 09/02/2021 09:37, Martin Maechler wrote:
>>>>>> Jeremie Juste
>>>>>>      on Mon, 08 Feb 2021 14:28:33 +0100 writes:
> 
>      > Hello,
>      > I have noticed a behavior that I don't understand. When I call the
>      > following function from the prompt.
>      > test <- function(){
>      > a <- readline("selection: ")
>      > a
>      > }
> 
>      >> test()
>      >> selection: |
>      > I can only type one character and the readline function exits before I can
>      > press enter.
> 
>      > however
> 
>      > test1 <- function(){
>      > a <- readline("selection:")
>      > a
>      > }
>      >> test1()
>      >> selection:|
>      > works as expected.
>      >> selection: abc[Ret]
> 
>      > However calling directly readline with a space in the prompt does what I
>      > would expect.
> 
>      >> a <- readline("selection: ")
>      >> selection: abc[Ret]
>      >> a
>      >> "abc"
> 
>      > It is the expected behavior or am I missing something?
> 
>      > Best regards,
>      > Jeremie
>      > --
>      > Jeremie Juste
>      >> R version 4.0.3 (2020-10-10)
> 
> Given that the above works fine in Linux (for Jim Lemon and Rolf Turner),
> 
> could you tell us *how* you use R?
> In the (Windows) RGui  or from Rstudio  or  ESS   or yet another way?
> 
> Usually the UI (user interface) should not matter, but rather
> the R version etc.
> But the UI may be important for a function like readline()
> which does UI ..
> 
> Martin
> 
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html