I use a mix of zodiac[0] and lowdown[1], and it works for the most part. The main thing for me is the leanness of the setup, it's just a shell script with some awk + an external (and rather fast) markdown parser. Sadly it's not quite what I want, the whole setup is rather "unstable"? I can't quite find the words, but I guess that anyone who reads into zodiac would get the feeling. Can anyone recommend something that goes in this direction (for example letting me use my own markdown parser) while being overall a bit more "coherent"?

[0]: https://github.com/nuex/zodiac
[1]: https://kristaps.bsd.lv/lowdown/