Support stdin and stdout as input file and output file in command line?

[y9c]

will it be possible?

my solution: (require readr package)

cat test.R| R --slave --no-restore --no-save -e "styler::style_text(readr::read_file((file(\"stdin\"))))"

[lorenzwalthert]

Thanks for clarifying. I think an alternative would be the following:

• Put an executable R script with shebang in a place that is part of your PATH or in a new directory and add that directory to your path. I am on Mac, so I put export PATH = $PATH:~/custom_bin in .bash_profile and then put the following script callerd styler.r in the custom_bin directory:

#!/usr/local/bin/Rscript
con <- file("stdin")
out <- styler::style_text(readLines(con))
close(con)
out

• Make the file executable with chmod +x ~/custom_bin/styler.r
• Now you can conveniently call it similar to a littler script.

echo "1+1" | styler.r
1 + 1

or

cat r-script.R | styler.r

if your code is in a script.

[y9c]

How about adding stdin argument into styler.

It is possible to do that in formatR.

cat test.R | R --slave --no-restore --no-save -e "formatR::tidy_source('stdin')" 

[y9c]

For vim plugin support, the formatter tool should be a single excutable or a one liner code.
Packing styler into script not a good solution, cause you need to generate the script manually when you start a new environment.

[lorenzwalthert]

For vim plugin support, the formatter tool should be a single excutable or a one liner code.
Packing styler into script not a good solution, cause you need to generate the script manually when you start a new environment.

Ok. So we have support for styler in ale, just added a few days ago, which is a VIM Plug-in: dense-analysis/ale#2401 (comment). Maybe this is what you are looking for?

[y9c]

I also pushed a commit for styler support in neoformat (another popular vim plugin) a few days ago, but it is not perfect. I need readr for styler to make it work.

https://github.com/sbdchd/neoformat/blob/924dee18e7ca547e105ab8d800069fc5829b019b/autoload/neoformat/formatters/r.vim#L8

[lorenzwalthert]

But why not using the approach I used above with readLines(file(„stdin“)) instead of the approach with readr?

[y9c]

I forget to close file, and got some error in the first attempt.

It works fine now. Thank you @lorenzwalthert

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BTW, the performance of styler is a little slow. Even if the file is well formatted.

styler::style_text (for 20 lines of R code)

cat test.R  0.00s user 0.00s system 79% cpu 0.001 total
R --slave --no-restore --no-save -e   0.40s user 0.02s system 100% cpu 0.411 total

black formatter of python (for a large file)

> time black -l 79 test.py
reformatted test.py
All done! ✨ 🍰 ✨
1 file reformatted.
black -l 79 test.py  0.14s user 0.02s system 38% cpu 0.406 total

> time black -l 79 test.py
All done! ✨ 🍰 ✨
1 file left unchanged.
black -l 79 test.py  0.07s user 0.01s system 99% cpu 0.082 total