Inserting arbitrary links in TOC

I have an extension that does just this:

# Add all the functions we have hyperlinked into the toc.
class CustomTocPostprocessor < Asciidoctor::Extensions::Postprocessor
        def process(document, output)
                $headings.each do |name, headings|
                        prefix = headings[:prefix]
                        section = %Q{<ul class="sectlevel2">\n} +
                                                headings[:functions].map {|f| %Q{<li><a href="##{prefix}_#{f}">#{f}<\/a><\/li>\n}}.join + '</ul>'

                        # Pick up the last occurrence of name so we know we have the one in the behavioural model section.
                        output = output.sub(/(.*<li><a href=".*?#{name}<\/a><\/li>)/m, '\1' + section)
                end
               
                output
        end
end


Basically I am including a lot of source code sections into the document and I want to add in the function names into the TOC.  The $headings is a hash of section names with details of the functions in each section.  The hyperlink to the action contents is formed from the section prefix (in case the same function name exists across sections) and the function name.

Dave.

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