export some pandoc syntax helper

[cderv]

I saw we have some helpers

knitr/R/hooks-md.R

Lines 228 to 238 in 031e08c

	pandoc_div = function(x, .attr = NULL, .class = NULL) {
	if (is.null(.attr) && is.null(.class)) return(x)
	fenced_block(c(x, ''), .attr, .class, .char = ':', .sep = ' ', .outer = '')
	}
	# add a fence around content (either fenced code block ``` or Div :::)
	fenced_block = function(x, ..., .char = '`', .sep = '', .outer = '\n\n') {
	x = one_string(c('', x))
	f = create_fence(x, .char)
	paste0(.outer, paste(f, block_attr(...), sep = .sep), x, f, .outer)
	}

What about exporting pandoc_div in addition to knitr::raw_block (which could probably be rewritten using fenced_block() 🤔

I often try to create some Divs or RawBlock as raw Markdow output, and having hepler function for that (support classes and attributes) can be useful.

I can also put them in quarto R package directly;

[yihui]

I think that's a good idea. I'd probably move them to xfun, so they can be shared across more packages.

[yihui]

FYI I just added a function fenced_block() to xfun. Note that classes are just a special case of attributes, i.e., class = 'foo' is equivalent to attr = '.foo', so I didn't provide a specific class argument to xfun::fenced_block().

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