Fix missing DCF code block on website

[IndrajeetPatil]

My guess is since knitr doesn't support DCF code blocks (cf. names(knitr::knit_engines$get())), pkgdown doesn't either.

• Current status:

https://lintr.r-lib.org/dev/reference/read_settings.html

• With this PR (locally)

[MichaelChirico]

Strange, I wouldn't have expected {knitr} to get involved here at all -- that's a pandoc/markdown code gate, IIUC {knitr} only considers ```{<engine> gates.

Possibly, the {pkgdown} rendering tool sees dcf as unrecognized & just fails to emit anything -- I wrote that expecting it would just ignore the language "hint" in this case (actually, I fully didn't expect any markdown renderer to have a specific DCF highlighter, just left it in as a hint in case one "eventually" shows up...)

[MichaelChirico]

Happy to accept the change, just wondering if this might be also reported with {pkgdown}?

[MichaelChirico]

Or maybe it's the class="sourceCode dcf" part that's at fault? since that's already HTML, i.e. past markdown rendering already.

Also note that this is not a {knitr} thing at all IIUC, it's really {roxygen2}->HTML-in-Rd->rendered HTML-in-{pkgdown}.

So, possibly {roxygen2} should be vetting that? 🤔

[IndrajeetPatil]

You are right!

This is indeed seems to be coming via roxygen2.

Feel free to create an issue upstream if you wish. :)