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

[Paul Keydel]

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
>> 	[[alternative HTML version deleted]]
>> 
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> 
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