Add comment character parameter

[alistaire47]

Currently, if I run

reprex::reprex({x <- rnorm(100) ; mean(x)}, venue = 'gh', show = FALSE)

I get the code for

x <- rnorm(100)
mean(x)
#> [1] 0.06771625

which is wonderful! However, changing the comment character, e.g. to ## is more complicated, requiring (as suggested on Twitter) copying

#+ include=FALSE
knitr::opts_chunk$set(comment = '##')

#+ realstuff
x <- rnorm(100)
mean(x)

and then calling reprex::reprex() to get the code for

x <- rnorm(100)
mean(x)
## [1] 0.04698201

To make this process simpler, could we get a comment character parameter in reprex akin to formatR::tidy_eval's prefix?

[jennybc]

OK you can do this now like so:

reprex::reprex({x <- rnorm(100) ; mean(x)}, venue = 'gh',
               opts_chunk = list(comment = '##'))

That generates this:

x <- rnorm(100) ; mean(x)
## [1] -0.04785671

This can be used to provide general knitr chunk and package options and, in particular, the one you wanted to modify.