Purl option to only output echoed chunks

[sebastian-c]

At the moment, purl has a documentation = 0 argument which means that only the code from the Rmd or Rnw document will be produced.

What if I have some preamble that I don't wish to include in the resulting R code? Say the setting up of knitr chunk options or other minor options.

To resolve this, perhaps an option to only produce code which is echoed? That is, produce an R file containing only the code visible in the document.

[yihui]

How about include=FALSE? This option often means we want to hide everything.

echo=FALSE is not a good idea, because even if we do not echo the code in the document, we may need it in the R script for completeness.

[yihui]

Sorry I changed my mind and now it should be the chunk option purl=FALSE.

[sebastian-c]

That's a good idea. It neatly solves all problems regarding echo and include.

[github-actions]

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