first steps with \dosingleempty

["Goebel, Juergen" <juergen.goebel@eads.com>]

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Hi,

Regarding the following example I've got two questions.

(1) Why don't I ever see the argument #2 in the output?
(2) What do I have to do to suppress the unwanted space
after the end of the output of this macro (as can be seen
in the result before the following comma)?

Regards,

Juergen


\def\Geb{\dosingleempty\doMyGeb}
\def\doMyGeb[#1]#2#3{, x %
   \iffirstargument%
      Aha
   \else
     \ifsecondargument%
       #2
     \else%
       ... %C%
     \fi
   \fi
   \ifthirdargument%
     #3%
   \else%
     ...%
   \fi}

\starttext

\Geb{Ulm}{11. 9. 2008} % should deliver x Ulm 11. 9. 2008
\Geb[Ulm]{Ulm}{11. 9. 2008} % should deliver x Aha Ulm 11. 9. 2008
\Geb{}{11. 9. 2008} % should deliver x ... 11. 9. 2008
\Geb{Ulm}{} % should deliver x Ulm ...
\Geb{}{} % should deliver x ...

\stoptext





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