[XeTeX] newcommand with optional arguments

Morten Høgholm morten.hoegholm at gmail.com
Tue Mar 4 10:24:32 CET 2008


On Tue, Mar 4, 2008 at 10:19 AM, Sven Siegmund <sven.siegmund at gmail.com> wrote:
> And I think the ultimate aolution to all this fuss may be what is written here:
>
> http://tex.loria.fr/texlive-htmldoc/eplain/eplain_6.html#SEC50
>
> But again: I do not really understand these TeX source codes...

Sven, I have a feeling you are getting increasingly confused. Here is
a complete example showing how it can be done.

\documentclass{article}

\makeatletter
\long\def\tlist at if@empty at nTF #1{%
 \expandafter\ifx\expandafter\\\detokenize{#1}\\%
   \expandafter\@firstoftwo
 \else
   \expandafter\@secondoftwo
 \fi
}

\newcommand*\nuu[2][]{%
  \textit{#2}%
  \tlist at if@empty at nTF{#1}{}{ `#1'}% only the false code executed
}
\makeatother
\begin{document}
\nuu{this} \nuu[22]{this} \nuu[goat]{mudi}
\end{document}

-- 
Morten


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