Capture the content within an environment

Question

When working in latex I can do an environment like

\begin{some}
stuff
\end{some}

and stuff happen and I can define my own environments, I am working on something and what I want to do is essentially to grab everything that was "stuff" in the example and do something to it during the end part of the definition, how would I go about that?

Without more details of what you really want to do it is difficult to say for sure but I think that you want the environ package. — , Jun 12 '18 at 17:00
You can use the environ package then do \NewEnviron{some}{Do things with \BODY}. Then when you call \begin{some} stuff \end{some} you get Do things with stuff. — Phelype Oleinik, Jun 12 '18 at 17:00
currently I am experimentating I just need a way to access the "stuff" part and by the sound, environ is it, imma try — Zelos Malum, Jun 12 '18 at 17:01
works dandy, thanks guys! :D anyone wanting the rep just write the answer and I'll accept it — Zelos Malum, Jun 12 '18 at 17:04
If it contains verbatim content see also macros - Collect contents of an environment (that contains verbatim content) - TeX - LaTeX Stack Exchange — user202729, Jun 16 '22 at 14:21

score 4 · Accepted Answer · answered Jun 12 '18 at 17:05

For this you can use the environ package's \NewEnviron{<env>} definition. The environment contents is captured inside \BODY that you can set as-is, or manipulate however you want.

\documentclass{article}

\usepackage{environ}

\NewEnviron{some}{%
  \BODY% Print the body of the some environment

  \renewcommand{\thisorthat}{that}% Update
  \BODY% Print the body of the some environment
}

\newcommand{\thisorthat}{this}

\begin{document}

\begin{some}
  It's either \thisorthat, or \thisorthat.
\end{some}

\end{document}

Capture the content within an environment

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