Is there a way to get at the current line number of the current input file in a Lua filter?
I can get the input file via PANDOC_STATE.input_files alright, but what about the input line?
I understand that Lua filters work on Pandoc ASTs, so the raw string input is already transformed. I used to save input line numbers with AST nodes when I wrote parsers. Is there such facility in Pandoc's ASTs? Writing a custom reader?