Selon Khaled Hosny <[email protected]>: > On Sun, Jan 02, 2011 at 10:15:11PM +0100, Arno Trautmann wrote: > > Hi all, > > > > I thought this would be a quite easy task with luaTeX, but I didn't > > manage to do it: > > I want to insert something (say, a rule) after a paragraph has been > > broken. So my first attempt was to register a function to > > post_linebreak_filter, but if I try to tex.print() something in that > > function it just doesn't do anything. > > By that stage tex has already processed its input and converted it to > node list, so you have to insert nodes here not tex input.
Plus, quoting the manual (p.108) about tex.print() and friends: "The result of using these functions from inside callbacks is undefined at the moment." Indeed you must add nodes, not input. A rule is easy enough, but for text you have to think you're TeX and build a function that turns a string into a list of nodes (that doesn't exist out of the box). See here for a starter: http://tug.org/pipermail/luatex/2010-November/002239.html (Note that I made an error in my code, see Taco's message.) Best, Paul
