[XeTeX] newcommand with optional arguments
Sven Siegmund
sven.siegmund at gmail.com
Tue Mar 4 10:35:55 CET 2008
Thank you, Morten,
the problem was I did not know how the first piece with \makeatletter
relates to the actual core \newcommand* code. I thought it would be
embedded somewhere within it.
I still do not understand the individual commands, but I see the
complete code you send works well and may be universally used.
Sorry for my confusion, I'll try to read some TeX reference to find
out what those Commands, @'s nTF's and so on mean.
S.
2008/3/4, Morten Høgholm <morten.hoegholm at gmail.com>:
> 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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