[NTG-context] [NTG-Context] How to compute correct page number for handout

Hello,

I'use extensively context to write my lecture notes and for all of my printing
needs.

For my students, I've made some lecture presentations in color, and I print
them in black&white, with four pages on one page for the handout.

I would like to compute a correct Table of contents according to the handout :
so to divide the current page number by four to get a correct page number for
the handout.

\def\ChapterPrefix#1{\the\numexpr#1/4 \relax}
\setupcombinedlist[content][level=1]
\setuplist[chapter][after=,before=,numbercolor=yellow,numbercommand=\underbar,pagecommand=\ChapterPrefix]

That doesn't work, and I've some difficulties to figure how computation is
performed in e-TeX...

Could you help me to resolve this issue ?

Kind regards,
Pierre-François Bonnefoi.
--
Bonnefoi Pierre-Francois                |    E-mail : bonne...@unilim.fr
Universite de Limoges, Laboratoire XLIM |       Tel : 06 28 18 03 38
83, rue d'Isle                          |  Mrs. Peel, we're needed...
87000 Limoges - FRANCE                  |                 The Avengers.

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