🚀 go-pugleaf

Hi,

I would like to define an environment that passes all its input text as a
parameter to a macro. An application of this is an environment that
prints its input text twice. The best thing I could do was

\def\doubleenv{\double}
\def\double#1\enddoubleenv{#1\par#1\par\end{doubleenv}}
\let\enddoubleenv\relax

so that I can write

normal textline
\begin{doubleenv}
This line to be printed twice
\enddoubleenv
normal textline

This solution has to drawbacks:

1.) it is not possible to use \end{doubleenv} since it seems not to be possible
    to include a begin group character in the parameter delimeter text. I don't
    want to change the catcodes of { and } as it is done in LaTeX's verbatim
    environment.

2.) it is not possible to use nested doubleenv environments since there is no
    matching of nested parameter delimeters.

I would appreciate any solution

     Ralf
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