I would love a way to "comment out" blocks of Markdown.  The only way I've 
been able to do it in R Markdown is to wrap the contents in a R code chunk 
with `eval=FALSE, include=FALSE`, to stop knit() from evaluating it, and 
removing it from the intermediate md output.  Of course, such a block can 
not contain other nested R-code chunks, unless they are commented-out.

``````
---
title: Comment
---

## Section

This is a simple placeholder for the manuscript's main document [@knuth84].


```{r}
x <- 1 + 1
x
```

Note pi is `r pi`.

```{r comments, eval=FALSE, include=FALSE}
You can embed code like this:

# ```{r}
# 1 + 1
# ```
but beware, is `r .NotYetImplemented()` still executed?
```

More text.

``````

Best of luck,

Jonathan
On Saturday, 26 August 2023 at 15:57:10 UTC-4 bapt a wrote:

> Hi,
>
> I'm playing with an idea for quarto, where one could comment out portions 
> of the input document including text and code chunks. This workaround would 
> make use of the trick that 1) Yaml blocks can appear anywhere in a pandoc 
> document, and 2) commented out (#) lines in Yaml are stripped by pandoc (?).
>
> I'd like to run a pre-processing step* on the input document to return 
> essentially the same input, but getting rid off those commented out Yaml 
> lines.
>
> Consider the following input file,
>
> ``````
> ---
> title: Comment
> ---
>
> ## Section
>
> This is a simple placeholder for the manuscript's main document [@knuth84].
>
>
> ```{r}
> x <- 1 + 1
> x
> ```
>
> Note pi is `r pi`.
>
> ---
> #  You can embed code like this:
> # 
> # ```{r}
> # 1 + 1
> # ```
> # but beware, is `r .NotYetImplemented()` still executed?
> ---
>
> More text.
>
> ``````
> The commented out portion should be removed before quarto calls the 
> computational engine, otherwise the code still gets executed.
>
> I've tried various flavours of markdown, such as
>
> > quarto pandoc -t noop.lua  -f markdown  index.qmd
>
> where noop.lua is a dummy Writer doing nothing,
>
> ```
> function Writer (doc, opts)
>   local filter = {  }
>   return pandoc.write(doc:walk(filter), 'markdown', opts)
> end
> ````
>
> but I'm not finding the right combination of options, if there is one. 
> Some markdown flavours seem to keep the Yaml comments (not sure why), 
> others reformat the 3-backticks code block. Is this "identity" Writer going 
> to be difficult to achieve?
>
> Many thanks,
>
> baptiste
>
> * Note that code is currently detected via regex in quarto, so it gets 
> executed even inside comments (hence the need of a pre-processor to strip 
> it entirely from the document).
> See https://github.com/quarto-dev/quarto-cli/discussions/3330 for more 
> context
>

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