Support .qmd in knitr::spin()

[cderv]

From discussion at

• Support spinning of R scripts quarto-dev/quarto-cli#4969 (reply in thread)

Currently format = "qmd" is not possible.

I think we could do format = "qmd" in spin(), to do like .Rmd but putting chunk options in YAML probably. With knit = FALSE / report = FALSE, it would produce a valid .qmd document.

We could also offer to run quarto::quarto_render() if report = TRUE - this is related to

• Improve knitr::spin rendering with .Rmd files #2281

where we shared the idea of running rmarkdown::render() on .Rmd using R Markdown V2 and not expecting knit2html()

Storing the idea here. Any thoughts @yihui ?

We could also argue that quarto convert myscript.R could be used (or another comment) to build from a .R to a .qmd

[yihui]

Done (since it's quite simple).

spin(text = c('#| echo: false','1+1'), format = 'qmd', knit = F)

I'm not sure if the quarto cli should support quarto render script.R directly, or only let the R package quarto support it. I'll leave this decision to the quarto team.

[cderv]

Thanks @yihui !

if the quarto cli should support quarto render script.R directly,

I have opened quarto-dev/quarto-cli#6660 for follow the discussion on this idea

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