\stopbuffer in macro

["Peter Münster" <pmlists@free.fr>]

Hello,

how could I build some macros, that make usage of \startbuffer and
\stopbuffer?
Example:
\def\startXXX[#1]{\doSomeMagicSetups{#1}%
  \startbuffer[...]}
\def\stopXXX{\stopbuffer
  \doSomeSpecialWorkHere}
And then:
\startXXX[some options]
some text
\stopXXX

TIA for any help!
Cheers, Peter

---------------------------------------------------

For those, who are interested, here in detail what I'm trying to do:

I still like the LaTeX listings.sty package very much, but porting it to
ConTeXt would be too much work for me. So why not using a wrapper?

Somewhere in the PATH I put the file createListing.sh:
#!/bin/bash
echo '\documentclass{article}\usepackage{listings}
      \lstset{language=C++,tabsize=4}\pagestyle{empty}
      \begin{document}\begin{lstlisting}{}' >$1-lst-ltx.tex
cat $1-lst.tmp >>$1-lst-ltx.tex
echo '\end{lstlisting}\end{document}' >>$1-lst-ltx.tex
latex $1-lst-ltx
dvips -E -o $1-lst-ltx.eps $1-lst-ltx

Then the ConTeXt-file:

\starttext
Here is a listing:

\startbuffer[lst]
#include <stdiostream.h>
int main(){
    return 0;
}
\stopbuffer
\immediate\write18{./createListing.sh \jobname}%
\externalfigure[\jobname-lst-ltx][]

And here we go on...
\stoptext

But this would be much better:

\def\startLST[#1]{\dosomesetups{#1}\startbuffer[...]}

\def\stopLST{\stopbuffer\immediate\write18{./createListing ...}%
  \externalfigure[...][...]}

And then:
\startLST[some options for \lstset{}]
some code
\stopLST

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