How can I define a command like `\copypaste{ref-label}`?

Question

How can I have a command like \copypaste{ref-label} such that it copy the corresponding environment to label \label{ref-label} and paste it where the command \copypaste{ref-label} is? or at least (if this is easier) two commands \copy{ref-label} (placing inside of the environment) and \paste{ref-label} (where we want to paste)?

I know that this commands may be useless but it is interesting and useful for me because sometimes I want to quote some lemmas, definitions,... from earlier chapters. Of course I can define new environments (new def, lem ,thm, ...) and set their counter to corresponding environment.

Answer 1

Something like that:

\documentclass{article}
\usepackage{scontents}
\pagestyle{empty}
\setlength{\parindent}{0pt}
\begin{document}
\section{Definitions}
Some text here...

\begin{scontents}[print-env=true,store-env=definitions]
First definition stored in memory.
\end{scontents}

More text here...

\begin{scontents}[print-env=true,store-env=definitions]
Second definition stored in memory.
\end{scontents}

\section{Other section}
Another little bit of text here, now I bring the definitions
I saved in memory...

\getstored[2]{definitions}\par

In reverse order

\getstored[1]{definitions}

\section{One more time}
Okay, I'll reoccupy the definitions, but in the right order.

\getstored[1]{definitions}\par
\getstored[2]{definitions}
\end{document}

The scontents package is designed to do this job, I have used the environment version, but you can also use the command version. If you have verbatim material is also supported and if you want to write to external files, well, you can also do it :).