Recognize `targets` chunk as R code block in Rmd files

[alaindanet]

Nvim-R does not recognize targets chunk as code block containing R code in Rmd files.

targets chunks contains R code that is managed by the targets R package to build a analysis pipeline.

Is there an option to set Nvim-R to behave with targets chunk as r chunk (i.e. sending code lines to the terminal, etc...) ?

Currently the plugin returns Not inside an R chunk. when I try to send lines inside targets chunks.

[jalvesaq]

I never used targets. Indeed, this is the first time that I know about it. What specifically do you need? Sending code from (Neo)Vim from {targets chunks to R? Syntax highlight of {targets chunks? The pattern to recognize chunks of R code in Rmd files is hardcoded in Nvim-R/ftplugin/rmd_nvimr.vim, Nvim-R/R/start_r.vim, R-Vim-runtime/syntax/rmd.vim, and R-Vim-runtime/indent/rmd.vim. We could create a variable to replace "r" with whatever the user wanted, in this case, "r\|targets", but I don't know if this would be enough, and, since I'm not going to use targets it would be better if someone else wrote a pull request for this.

[alaindanet]

Thank you so much for your answer. I have tried to spot the places where the changes could be made after you pointed the files:

• In Nvim-R/ftplugin/rmd_nvimr.vim:

  • Change r to (r|targets)?

    function! RmdIsInRCode(vrb)
    let chunkline = search("^[ \t]*```[ ]*{r", "bncW")

  • Change \\(r\\ to \\(r\\|targets\\:

            let i = search("^[ \t]*```[ ]*{\\(r\\|python\\)", "bnW")

• Change r" to (r|targets)"

  let chunkline = search("^[ \t]*```[ ]*{r", "bncW") + 1

  • Nvim-R/R/start_r.vim:

• Change \\(r\\ to \\(r\\|targets\\:

                  \ ((&filetype == "rmd" || &filetype == "quarto") && line =~ "^[ \t]*```{\\(r\\|python\\)"))

• Change to (r|targets):

  let begchk = "^[ \t]*```[ ]*{r"

• In R-Vim-runtime/indent/rmd.vim, change {r to {(r|targets):

  if getline(".") =~ '^[ \t]*```{r .*}$' || getline(".") =~ '^[ \t]*```$'
  return 0
  endif
  if search('^[ \t]*```{r', "bncW") > search('^[ \t]*```$', "bncW")

  I did not find anything in R-Vim-runtime/syntax/rmd.vim

If you think that those changes are the ones to implement, I will give a try!

[jalvesaq]

Yes, please try it. I suggest that you create a variable, perhaps named R_chunk_pattern in your init.vim:

R_chunk_pattern = 'r\|targets'

And, then, replace as in the example:

            let i = search("^[ \t]*```[ ]*{\\(" . R_chunk_pattern . "\\|python\\)", "bnW")

I suggest creating a variable because we don't know if another pattern in the future will have to be recognized as an indicator of an R chunk.