[NTG-context] first steps with \dosingleempty

[Wolfgang Schuster]

On Thu, Sep 11, 2008 at 9:56 AM, Goebel, Juergen
<juergen.goebel at eads.com> wrote:
> Hans Hagen wrote:
>
>> \unexpanded\def\Geb{\dosingleempty\doMyGeb}
>>
>> \def\doMyGeb[#1]#2#3%
>>    {, x \iffirstargument Aha \fi
>>     \doifsomethingelse{#2}{#2}{...}\space
>>     \doifsomethingelse{#3}{#3}{...}%
>>     \par}
>
> Thanks a lot, elegant and much shorter.
> But, alas, I can't test it yet since the
> \doifsomethingelse seems to be somewhat
> newer.  My oldtimer (according to Hraban)
> shall really be updated during the next
> days or weeks ...

You could use \doifelsenothing with reverse order for the second
and third argument, \doifsomethingelse was included after the
TL 2008 ConTeXt release.

Wolfgang