formals() and chunk options

[yihui]

@baptiste observed the similarity between formals() and chunk options, and this may bring a fundamental change to how we write chunk options (use real valid R code instead of pseudo code)

Proof of concept:

> x = 'label,a=1,b=asdf,c="qwer",d=FALSE,e=c(1,2,3)'
> z = formals(eval(parse(text = sprintf('function(%s){}', x))))
> str(z)
Dotted pair list of 6
 $ label: symbol 
 $ a    : num 1
 $ b    : symbol asdf
 $ c    : chr "qwer"
 $ d    : logi FALSE
 $ e    : language c(1, 2, 3)

[baptiste]

I've asked some advice on how best to create an alist from a character string.

[baptiste]

hadn't seen your update; I think eval(parse(text = paste("alist(", x, ")"))) is essentially equivalent. Not sure how to avoid the eval(parse)

[github-actions]

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