Collecting contents of LaTeX environment

Question

I have the following for collecting contents of an environment and printing them later, it works but for my real task i want to use the environ package because i need to be able to have access to \BODY. How can i produce the same output with \NewEnviron instead of \newenvironment used?

\documentclass{article}
\usepackage{collect}
\usepackage{environ}
\definecollection{notes}
%works but not what i realy want i need access to \BODY and for that i cant  use \newenvironment command
\makeatletter
\newenvironment{note}
  {@nameuse{collect}{notes}{\par\noindent}{\par}{}{}}
   {@nameuse{endcollect}}
\makeatother
%what i realy want
%\NewEnviron{note}{
%@nameuse{collect}{notes}{\par\noindent}{\par}{}{}
  %\BODY
%@nameuse{endcollect}
%}
\begin{document}
\begin{note}
 First note
 \end{note}
\begin{note}
 Second note
 \end{note}
\begin{note}
Third note
\end{note}
\section{collected}
\includecollection{notes}
\end{document}

One of the many answers to questions tagged content-replication may help solve your problem. — Ethan Bolker, Jun 27 '14 at 13:14
See also macros - Collecting contents of environment and store them for later retrieval - TeX - LaTeX Stack Exchange — user202729, Jun 19 '22 at 17:55

score 6 · Answer 1 · answered Jun 27 '14 at 11:14

If your collected notes are only needed at the end of the document, you can avoid writing out files: just use token registers.

\documentclass{article}
\usepackage{environ}

\newtoks\mainnotetoks
\newtoks\tempnotetoks
\newtoks\prenotetoks
\newtoks\postnotetoks

\NewEnviron{note}{%
  \tempnotetoks=\expandafter{\BODY}%
  \edef\notetemp{%
    \the\mainnotetoks % what was already stored
    \the\prenotetoks % text before the new note
    \the\tempnotetoks % the current note
    \the\postnotetoks % text after the new note
  }%
  % update \mainnotetoks
  \global\mainnotetoks=\expandafter{\notetemp}%
}
\newcommand\includenotes{\the\mainnotetoks}

% set the pre and post note
\prenotetoks={\par\noindent}
\postnotetoks={\par}

\begin{document}

Here we have a first note.
\begin{note}
First note
\end{note}

Here we have a second note.
\begin{note}
Second note
\end{note}

Here we have a third note.
\begin{note}
Third note
\end{note}

\section{collected}
\includenotes
\end{document}

enter image description here

score 4 · Answer 2 · answered Jun 27 '14 at 10:12

If you don't stick to the collect package, there is just the way to directly write the \BODY command to a file and expand it there, afterwards reread that file:

\documentclass{article}
\usepackage{collect}
\usepackage{xcolor}
\usepackage{amsmath}
\usepackage{environ}

\definecollection{notes}

\newwrite\collecthandle%

\AtBeginDocument{%
\immediate\openout\collecthandle=\jobname.mynotes%
}

\newcommand{\CollectNotes}[1]{%
\immediate\closeout\collecthandle%
\IfFileExists{#1}{\input{#1}}{Nope}%
}%

\AtEndDocument{%
\immediate\closeout\collecthandle% Close it anyway
}%

%works but not what i realy want i need access to \BODY and for that i cant  use \newenvironment command
\makeatletter
\newenvironment{note}
  {\@nameuse{collect}{notes}{\par\noindent}{\par}{}{}}
   {\@nameuse{endcollect}}
\makeatother

%what i realy want
\NewEnviron{Note}{%
\immediate\write\collecthandle{%
\unexpanded\expandafter{\expandafter{\BODY}}%
}%
\immediate\write\collecthandle{%
\string\newline
}%
}%


\begin{document}

\begin{Note}
 First Note
 \end{Note}

\begin{Note}
 Second Note
\end{Note}

\begin{Note}
Third Note
\end{Note}

\begin{Note}
fourth Note with coloured mathematical markup \textcolor{red}{\[\int\limits \left({x^2}\right)dx = \dfrac{1}{3}x^3 +C \]}
and even with \textbf{bold font}
\end{Note}


\section{collected}
\CollectNotes{\jobname.mynotes}
\end{document}

enter image description here

score 0 · Answer 3 · answered Oct 26 '19 at 20:36

I leave this answer here because they were inspirational for the creation of the scontents package. Everything stored in memory including verbatim content. If you wish you can also save the content in external files using the key write-env=file.tex. Thanks @egreg for the MWE and the great answer.

\documentclass{article}
\usepackage[store-env=notes]{scontents}
\pagestyle{empty}
\begin{document}

Here we have a first note.
\begin{scontents}
First note
\end{scontents}

Here we have a second note.
\begin{scontents}
Second note
\end{scontents}

Here we have a third note.
\begin{scontents}
Third note
\end{scontents}

\section{collected}
\foreachsc[sep={\\[10pt]}]{notes}
\end{document}

Collecting contents of LaTeX environment

3 Answers3

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