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From: Marco Pessotto <melmothx@gmail.com>
To: ntg-context@ntg.nl
Subject: \do(single|double|etc)empty behaviour
Date: Wed, 15 Dec 2010 19:40:27 +0100	[thread overview]
Message-ID: <87fwtyj2w4.fsf@universe.krase.net> (raw)


Hello there.

I was writing a small macro to emulate a custom \part command, and I
broke my head against \dosingleempty (but finally I won). 

Why this example is working:

%%%%%%%%% start %%%%%%%%%%%%%%%%%
\definelist[talpart]
\define\talpart{\page[right]%
  \blank[2*big]%
  \startalignment[center]%
    \dosingleempty\doTalPart}
\def\doTalPart[#1]#2{%
    \iffirstargument
    debug: I have the optional arg
    \bfc#1\blank[2*big]
    \writetolist[talpart]{}{{#1. }#2}
    \else
    debug: I don't have any arg
    \blank[2*big]
    \writetolist[talpart]{}{#2}
    \fi
    \bfd#2
    \stopalignment
    \blank[2*big]
}

\starttext
\placelist[talpart]
\talpart[optional]{With optional argument}
\input knuth
\talpart{No argument}
\input ward
\stoptext
%%%%%%%%%%% stop %%%%%%%%%%%%%%%%

While this, the original one, is definitively not working?

%%%%%%%%% start %%%%%%%%%%%%%%%%%
\definelist[talpart]
\define\talpart{\dosingleempty\doTalPart}
\def\doTalPart[#1]#2{%
  \page[right]
  \startalignment[center]
    \blank[force,2*big]
    \iffirstargument
    debug: I have the optional arg
      \noindent{\bfc#1}\blank[2*big]
      \writetolist[talpart]{}{{#1. }#2}
    \else
    debug: I don't have any arg
      \blank[2*big]
      \writetolist[talpart]{}{#2}
    \fi
      {\noindent \bfd#2}
    \stopalignment
    \page[left]
}
\starttext
\placelist[talpart]
\talpart[optional]{With optional argument}
\input knuth
\talpart{No argument}
\input ward
\stoptext
%%%%%%%%%%% stop %%%%%%%%%%%%%%%%

It's unclear to me how the arguments are passed between macros.
Probably it's just a matter of knowledge of TeX macro programming (which
obviously I don't have).

My source of inspiration was:
http://wiki.contextgarden.net/Commands_with_optional_arguments

Bests

-- 
Marco

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             reply	other threads:[~2010-12-15 18:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-15 18:40 Marco Pessotto [this message]
2010-12-15 22:56 ` Wolfgang Schuster
2010-12-15 23:31   ` Marco Pessotto

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