Calling purl from within a knit document

[csgillespie]

If we include purl call within a knitr document, i.e.

<<echo=FALSE>>=
library(knitr)
purl("tmp.Rnw")
@

we get a duplicate label error.

[yihui]

should be fixed now

[adammwilson]

Is it possible to include the purl'ed .R file as an additional 'output' format without calling purl() separately from within RStudio? This would be nice for automatically generating both a markdown version and a runnable script at the same time (without worrying about file names, etc.). So, something like this:

---
title: "knit and purl"
output:
  md_document:
    variant: markdown_github
  r_script  

---

[adammwilson]

Answering my own question (in a way), it's possible to achieve my objectives with the following chunk:

'''{r, echo=FALSE, message=FALSE, results='hide', purl=FALSE}
input  = knitr::current_input()  # filename of input document
output = paste(tools::file_path_sans_ext(input), 'R', sep = '.')
knitr::purl(input,output,documentation=2,quiet=T)
'''

A little clunky, but 5 extra lines isn't too bad... Be careful that the purled version may not result in identical outputs as it does not include in line comments. See various threads about this (e.g. #812 (comment)).

[phoede]

I tried to include a purl call when knitting a .Rmd file and I get a duplicate label error.
I have found a question on https://stackoverflow.com/questions/36868287/purl-within-knit-duplicate-label-error , so I should not be the only one.
Any ideas?

[github-actions]

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