Set QUARTO_R to be sure to run with the same R version as the current R session ?

[cderv]

withr::with_envvar(
  list(QUARTO_R = fs::path(R.home(), "bin")), 
  withr::with_dir(temp_demo, quarto::quarto_render(as_job = FALSE))
)

I needed to do that because of this error

> withr::with_dir(temp_demo, quarto::quarto_render(as_job = FALSE))
[ 1/10] index.qmd
++ Activating rlang global_entrace



processing file: index.qmd
Error in `comment_chars[[engine]] %||% "#"`:
! could not find function "%||%"
Backtrace:
  1. global .main()
  2. execute(...)
  3. rmarkdown::render(...)
  4. knitr::knit(knit_input, knit_output, envir = envir, quiet = quiet)
  5. knitr:::process_file(text, output)
     ...
  8. knitr (local) FUN(X[[i]], ...)
  9. knitr:::parse_block(g[-1], g[1], params.src, markdown_mode)
 10. knitr::partition_chunk(engine, code)
 11. xfun::divide_chunk(engine, code)
 12. xfun:::get_option_comment(engine)
Execution halted

could not find function "%||%"

xfun 0.46 only defines "%||%" for R 4.4 which is the version I used to call quarto_render(). But probably quarto renderCLI is using the default R version in the PATH which is4.3`. Somehow xfun was not handling this correctly... 🤔

Setting QUARTO_R solves it

Need to understand why.