Is there an easy way to pass alone a custom struct through the parser? Md allows various hooks to hook into the parsing flow; it would be nice to embed and mutate some custom state. For example, I may want to do a word count for certain elements.
I can achieve this goal with walking the AST after the parsing, but that feels awkward.
One might pass State to Md.parse/2 as a second parameter. Starting with v0.7.0 it has payload key.
All the listener functions can return a tuple {:update, new_state} to update the state.
Sorry for boosting my own thread, but I added two examples of how to use md in the wild.
One is about how to extend the existing syntax, another one is about how to create a syntax from scratch. See tests for how it works. Cheers.