Trying to generate a syntax-highlighted listing block from a macro (using AsciiDoctor)

eg.adoc

Example

Here’s the macro in use:

rml::blah[]

And here’s the equivalent in-place listing block:

require 'eg'

puts 'blah'

listing-block.rb

class MyListingBlockMacro < Asciidoctor::Extensions::BlockMacroProcessor
  use_dsl

  named :rml

  def process(parent, target, attrs)
    listing = create_listing_block(parent, "require 'eg'\n\nputs '#{target}'\n", attrs)
    listing.style = 'source'
    listing.set_attr 'language', 'ruby'
    listing.commit_subs

    $stderr.puts listing.content
    listing
  end
end

Asciidoctor::Extensions.register do
  block_macro MyListingBlockMacro
end

runner.sh

#!/bin/sh

asciidoctor -r ./listing-block.rb eg.adoc