* post_linebreak_filter in context
@ 2011-02-25 11:28 Patrick Gundlach
2011-02-25 12:46 ` Hans Hagen
0 siblings, 1 reply; 3+ messages in thread
From: Patrick Gundlach @ 2011-02-25 11:28 UTC (permalink / raw)
To: mailing list for ConTeXt users
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-context)
Thanks
Patrick
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: post_linebreak_filter in context
2011-02-25 11:28 post_linebreak_filter in context Patrick Gundlach
@ 2011-02-25 12:46 ` Hans Hagen
2011-02-25 15:14 ` Patrick Gundlach
0 siblings, 1 reply; 3+ messages in thread
From: Hans Hagen @ 2011-02-25 12:46 UTC (permalink / raw)
To: mailing list for ConTeXt users; +Cc: Patrick Gundlach
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
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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