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).
Why this example is working:
%%%%%%%%% start %%%%%%%%%%%%%%%%%
\definelist[talpart]
\define\talpart{\page[right]%
\blank[2*big]%
\startalignment[center]%
\dosingleempty\doTalPart}
\def\doTalPart[#1]#2{%
\iffirstargument
debug: I have the optional arg
\bfc#1\blank[2*big]
\writetolist[talpart]{}{{#1. }#2}
\else
debug: I don't have any arg
\blank[2*big]
\writetolist[talpart]{}{#2}
\fi
\bfd#2
\stopalignment
\blank[2*big]
}
\starttext
\placelist[talpart]
\talpart[optional]{With optional argument}
\input knuth
\talpart{No argument}
\input ward
\stoptext
%%%%%%%%%%% stop %%%%%%%%%%%%%%%%
While this, the original one, is definitively not working?
%%%%%%%%% start %%%%%%%%%%%%%%%%%
\definelist[talpart]
\define\talpart{\dosingleempty\doTalPart}
\def\doTalPart[#1]#2{%
\page[right]
\startalignment[center]
\blank[force,2*big]
\iffirstargument
debug: I have the optional arg
\noindent{\bfc#1}\blank[2*big]
\writetolist[talpart]{}{{#1. }#2}
\else
debug: I don't have any arg
\blank[2*big]
\writetolist[talpart]{}{#2}
\fi
{\noindent \bfd#2}
\stopalignment
\page[left]
}
\starttext
\placelist[talpart]
\talpart[optional]{With optional argument}
\input knuth
\talpart{No argument}
\input ward
\stoptext
%%%%%%%%%%% stop %%%%%%%%%%%%%%%%
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).
My source of inspiration was:
http://wiki.contextgarden.net/Commands_with_optional_arguments
Bests
--
Marco
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