[R-SIG-Mac] R 4.1.2 (arm build) will output for nothing when --interactive flag is passed

[Paul Keydel]

Hey Simon!

Great! Thank you very much for the explanation!

I installed the 4.1.2 patched and this version solved the issue, i.e. R treats stdin correctly.

Cheers,
Paul

> On 24. Jan 2022, at 02:35, Simon Urbanek <simon.urbanek using R-project.org> wrote:
> 
> Paul,
> 
> thanks, you example is getting closer to the real issue which is that stdin is not treated as input if libedit is used and --interactive is specified:
> 
> R 4.1.2 arm64 binary:
> $ echo x | R --quiet --no-save --interactive
> 
> 
> Current (4.1.2 patched or devel - https://mac.R-project.org) R arm64 binary:
> $ echo x | R --quiet --no-save --interactive
>> x
> Error: object 'x' not found
>> 
> 
> 
> The main difference is that the binaries are now using libreadline instead of Apple's libedit (see extSoftVersion()["readline"] ). So the short answer is update your R if that matters to you. I have not looked into the cause in libedit, so I don't know if that is a libedit bug or something we do.
> 
> Cheers,
> Simon
> 
> 
> 
>> On Jan 24, 2022, at 11:08 AM, Paul Keydel <paul.keydel using posteo.de> wrote:
>> 
>> Dear all!
>> 
>> Thanks for reporting the issue. I observed the same problem, but I messaged not quickly enough...
>> In fact, it seems that the ARM build of R (4.1.2) cannot pick up the data piped in when the —interactive flag is set. For reproducing I would suggest to use a simple “print(2.718)” instead of the string below.
>> 
>> So, here is what I got, just copied from the terminal (macOS 12.1)
>> 
>> Pauls-Air:~ paul$ echo "print(2.718)" | R --quiet --no-save
>>> print(2.718)
>> [1] 2.718
>>> 
>> Pauls-Air:~ paul$ echo "print(2.718)" | R --quiet --no-save --interactive
>> 
>> Pauls-Air:~ paul$
>> 
>> The first one gives the expected output, but when I force R to be in interactive mode, R somehow ignores the input from stdin. And we don’t know why :-)
>> 
>> Thanks for your time and help!
>> 
>> Best,
>> Paul
>> 
>> 
>>> On 23. Jan 2022, at 22:12, Simon Urbanek <simon.urbanek using R-project.org> wrote:
>>> 
>>> Year,
>>> 
>>> that code doesn't output anything on stdout, because it is an error so it does show up on stderr:
>>> 
>>> $ echo "base::cat('Hello\\\\n')\\n" | R --silent --no-save --interactive 
>>>> base::cat('Hello\\n')\n
>>> Error: unexpected '\\' in "base::cat('Hello\\n')\"
>>> 
>>> What you probably meant was 
>>> 
>>> $ echo 'cat("Hello\n")' | R --silent --no-save --interactive 
>>>> cat("Hello\n")
>>> Hello
>>>> 
>>> 
>>> which works as expected.
>>> 
>>> Cheers,
>>> Simon
>>> 
>>> 
>>> 
>>> 
>>>> On Jan 23, 2022, at 12:33 PM, YearNorth via R-SIG-Mac <r-sig-mac using r-project.org> wrote:
>>>> 
>>>> Dear developer:
>>>> 
>>>> On R 4.1.2 (arm build) in macOS 12.0.1, if call R from shell, when —interactive flag is passed, it will output nothing.
>>>> 
>>>> To reproduce it:
>>>> 
>>>> ```
>>>> echo "base::cat('Hello\\\\n')\\n" | R --no-save --interactive > test.txt
>>>> 
>>>> ``
>>>> 
>>>> doesn’t yield the derised output
>>>> 
>>>> ```
>>>> R version 4.1.2 (2021-11-01) -- "Bird Hippie”
>>>> Copyright (C) 2021 The R Foundation for Statistical Computing
>>>> Platform: aarch64-apple-darwin20 (64-bit)
>>>> 
>>>> R is free software and comes with ABSOLUTELY NO WARRANTY.
>>>> You are welcome to redistribute it under certain conditions.
>>>> Type 'license()' or 'licence()' for distribution details.
>>>> 
>>>> Natural language support but running in an English locale
>>>> 
>>>> R is a collaborative project with many contributors.
>>>> Type 'contributors()' for more information and
>>>> 'citation()' on how to cite R or R packages in publications.
>>>> 
>>>> Type 'demo()' for some demos, 'help()' for on-line help, or
>>>> 'help.start()' for an HTML browser interface to help.
>>>> Type 'q()' to quit R
>>>> 
>>>> ```
>>>> 
>>>> The desired output should have a line `> base::cat('Hello\\n')\n` in test.txt
>>>> 
>>>> This may be the critical problem for why `vscDebugger` (a R debugger for VSCode) does not work for arm build R.
>>>> 
>>>> See the discussion on github 
>>>> https://github.com/ManuelHentschel/VSCode-R-Debugger/issues/155#issuecomment-1014946738 <https://github.com/ManuelHentschel/VSCode-R-Debugger/issues/155#issuecomment-1014946738>
>>>> https://github.com/ManuelHentschel/VSCode-R-Debugger/issues/155#issuecomment-1017250405 <https://github.com/ManuelHentschel/VSCode-R-Debugger/issues/155#issuecomment-1017250405>
>>>> 
>>>> Thanks for your time reading and processing my email!
>>>> 
>>>> Best,
>>>> North
>>>> Year
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>>>> 
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>>> 
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