Some markdown parsers allow you to take a look at the AST. I used it to replace a code section containing dot code with a png. or using comments like <!--more

Some markdown parsers allow you to take a look at the AST. I used it to replace a code section containing dot code with a png. or using comments like <!--more--> to generate site Teasers. https://github.com/enter-haken/book/blob/master/lib/generator/markdown.ex https://github.com/enter-haken/book/blob/master/lib/generato... You can use pandoc to convert markdown in almost every format you like. I use it to write letters. https://hake.one/blog/letter.html https://hake.one/blog/letter.html If you have access to the AST, you can integrate as much metadata as you like.