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\documentclass{article}
\usepackage{xsimverb,listings,xcolor}
\lstdefinestyle{mystyle}{
language = [AlLaTeX]TeX ,
basicstyle = \ttfamily ,
columns = fullflexible ,
commentstyle = \color{gray!70} ,
keywordstyle = \color{red!70!black}
}
\makeatletter
\NewDocumentEnvironment{example}{!o}
{%
\XSIMgobblechars{2}%
\XSIMsetfilebegin{\@percentchar\space file `\jobname.tmp'}%
\XSIMsetfileend{\@percentchar\space bye bye}%
\IfNoValueTF{#1}
{\XSIMfilewritestart*{\jobname.tmp}}
{\XSIMfilewritestart{\jobname.tmp}}%
}
{%
\XSIMfilewritestop
\lstinputlisting[style=mystyle]{\jobname.tmp}%
\input{\jobname.tmp}
}
\NewDocumentEnvironment{code}{!o}
{%
\XSIMgobblechars{2}%
\IfNoValueTF{#1}
{\XSIMfilewritestart*{\jobname.tmp}}
{\XSIMfilewritestart{\jobname.tmp}}%
}
{%
\XSIMfilewritestop
\lstinputlisting[style=mystyle]{\jobname.tmp}%
}
\makeatother
\begin{document}
\begin{example}
bla bla \LaTeX
\end{example}
\bigskip
\begin{code}
blubber \LaTeX
\end{code}
\end{document}
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