Re: [NTG-context] Using defaults and indexes

21 Jan 2009


      Am 21.01.2009 um 19:28 schrieb Cecil Westerhof:
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2009/1/21 Wolfgang Schuster :
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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