This is my first steps with luatex, and I have tried to learn from this site how to add "luatex callback" the problem is that I find only a few examples on post_linebreak_filter or process_input_buffer although the list of callback is long http://wiki.luatex.org/index.php/Callbacks
My hope is to create a list of example which demonstrate how to use callback with lualatex
post_linebreak_filterhttps://tex.stackexchange.com/a/58327/243. – topskip Oct 22 '18 at 07:34