Am 21.01.2009 um 19:28 schrieb Cecil Westerhof:
2009/1/21 Wolfgang Schuster <schuster.wolfg...@googlemail.com>:
When the first parameter is filled, but not with a recognized
value,
then the second parameter should be filled. If not, the
compilation of
the file should generate an error.
I did only what you wrote.
I was not clear enough again.
What I mend was that when there is not a recognized value, then the
output file should not be generated. When you give a return the file
is still generated. But that is only a minor. (Maybe what I want is
not possible.)
\long\def\letterbody#1%
{\def\@@letterbody{{\blank[line]\setupindenting[yes,medium]#1\par}}}
\def\letterclosing
{\dodoublegroupempty\doletterclosing}
\def\doletterclosing#1#2%
{\ifsecondargument
\dodoletterclosing{#1}{#2}%
\else
\doifelsenothing{#1}
{\dodoletterclosing{Hoogachtend,}{Cecil Westerhof}}%
{\processaction
[#1]
[ family=>{\dodoletterclosing{Informal closing,}{Cecil
Westerhof}},
business=>{\dodoletterclosing{Formal closing}{Cecil
Westerhof}},
unknown=>{\message{Warning: Wrong keyword for \string
\letterclosing.}}]}%
\fi}
\def\dodoletterclosing#1#2%
{\@@letterbody
\blank[line]#1\blank[3*line]#2}
\starttext
\letterbody{\dorecurse{2}{\input knuth\par}}
\letterclosing{unknown}
\stoptext
Best wishes
Wolfgang
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