post_linebreak_filter in context
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
On 25-2-2011 12:28, Patrick Gundlach wrote:
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?
first put the function in some namespace, like: moduledata.mystuff = { } moduledata.mystuff.show_hyph = show_hyph then register it in the finalizer group (which is the post_linebreak stuff) nodes.tasks.appendaction("finalizers","after","moduledata.mystuff.show_hyph") (before and after are subgroups that can be used by users if needed; of course one never know to what extent it will influence other processes, so "shipouts","after" might be a better choice) ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
Hello Hans,
first put the function in some namespace, like:
moduledata.mystuff = { } moduledata.mystuff.show_hyph = show_hyph
then register it in the finalizer group (which is the post_linebreak stuff)
nodes.tasks.appendaction("finalizers","after","moduledata.mystuff.show_hyph")
Works perfectly.
(before and after are subgroups that can be used by users if needed; of course one never know to what extent it will influence other processes, so "shipouts","after" might be a better choice)
Ok. In this case it works for me but I'l remember that. Thanks! Patrick
participants (2)
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Hans Hagen -
Patrick Gundlach