Hi, how do I install a custom post_linebreak_filter in ConTeXt? I have this LaTeX file: ------------------------------------------------------------------------------------ \documentclass[12pt,a4paper]{scrartcl} \usepackage[english]{babel} \usepackage{blindtext} \usepackage{fontspec} \directlua{ show_hyph = function(head) while head do if head.id == 0 or head.id == 1 then % hlist, vlist show_hyph(head.list) % should be head.head in a newer luatex than 0.64 elseif head.id == 7 then % disc local n = node.new("whatsit","pdf_literal") n.mode = 0 n.data = "q 0.3 w 0 2 m 0 7 l S Q" n.next = head.next n.prev = head head.next = n head = n end head = head.next end return true end luatexbase.add_to_callback("post_linebreak_filter",show_hyph,"show_hyph") } \begin{document} \begin{minipage}{5cm} \blindtext \end{minipage} \end{document} ------------------------------------------------------------------------------------ which registers a function "show_hyph" as the post_linebreak_filter (the rest is not really interesting). How would I do this in ConTeXt? (also asked on tex.se: http://tex.stackexchange.com/questions/11960/how-to-register-a-callback-in-c...) Thanks Patrick