Am 15.12.2010 um 19:40 schrieb Marco Pessotto:
>
> 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).
>
> […]
>
> 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).
Your test with \iffirstargument fails because you perform it after
\startalignment
which has itself a argument which sets \iffirstargument to true, a better way to
check for content of the optional argument is \doifsomethingelse.
\def\talpart
{\dosingleempty\dotalpart}
\def\dotalpart[#1]#2%
{\page[right]
\blank[force,2*big]
\startalignment[center]
\doifsomethingelse{#1}
{{\bfc#1}\writetolist[talpart]{}{#1. #2}}
{\writetolist[talpart]{}{#2}}%
\blank[2*big]
{\bfd#2}
\stopalignment
\page[left]}
Wolfgang
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