% -*- coding: utf-8; time-stamp-pattern: "def\\\\dtxtimestamp{%02d-%02m-%:y at %02H:%02M:%02S %Z}" -*-
% N.B.: this dtx file is NOT for use with \DocInput but only docstrip.
% The latex source of the user manual isn't commented out.
%<*none>
\def\dtxtimestamp{29-09-2019 at 10:46:12 CEST}%
%</none>
%<*!readme&!install>
%%
%% Package: filecontentsdef
%% Version: 1.5 (2019/09/29)
%% License: LPPL 1.3c
%% Copyright (C) 2016-2019 Jean-Francois Burnol <jfbu at free dot fr>
%%
%</!readme&!install>
%<*none>
\def\pkgname        {filecontentsdef}
\def\pkgdate        {2019/09/29}
\def\pkgdocdate     {2019/09/29}
\def\pkgversion     {v1.5}
\def\pkgdescription {filecontents + macro + verbatim (JFB)}
\catcode`\^ 12 \iffalse
%</none>
%<*readme|install>
<!-- -->

    Source:  filecontentsdef.dtx (v1.5 2019/09/29)
    Author:  Jean-Francois Burnol
    Info:    filecontents + macro + verbatim
    License: LPPL 1.3c
    Copyright (C) 2016-2019 Jean-Francois Burnol.
    <jfbu at free dot fr>

%</readme|install>
%<*readme>
ABSTRACT
========

This lightweight LaTeX2e package provides an environment `filecontentsdef`
which is like the `filecontents` environment of Scott Pakin's
[filecontents] [1] package but in addition to the file creation stores the
(verbatim) contents into a macro given as an additional argument (either as a
control sequence or as a name).

Displaying verbatim these contents is possible via `\filecontentsprint`,
and executing them (if they represent LaTeX code) via `\filecontentsexec`.

A variant environment `filecontentsdefmacro` stores the contents into a
macro, but skips the save-to-a-file part.

[1]: http://www.ctan.org/pkg/filecontents "filecontents package"

CHANGE LOG
==========

v1.5 \[2019/09/29\]
-------------------

- `\filecontentsexec` does not forcefully reset `\newlinechar`
  to its LaTeX default after execution.

- `\FCD@` as prefix for internal non public macros.

- drop usage of the legacy LaTeX mechanism which issued a warning
  in case of a form feed or horizontal tabulation character in the
  parsed contents.

- make handling of the tabulation and form feed characters
  customizable.

- treat especially the case when the `\end{filecontents...}`
  is not on a line of its own.

- add `filecontentsdefstarred` (et al.) as alias for
  `filecontentsdef*` (et al.) for easying up encapsulation in
  wrapping environments.

- breaking change: `filecontentsdef` and `filecontentsdefmacro`
  define a macro obeying the local scope. Use `filecontentsgdef`,
  resp. `filecontentsgdefmacro` for definitions with global scope.

- make the name of the environment used by `\filecontentsprint`
  customizable (it defaults to `verbatim`) and allow to pass options
  to it; has been tested with `fancyvrb` and `minted`.

- add `\filecontentsprintviascan` which allows to use verbatim-like
  environment such as `listings` which are incompatible with
  `\filecontentsprint`.

v1.4 \[2019/04/20\]
-------------------

- backport 2018/04/01 LaTeX release change to filecontents environment
  (`^^L` and `^^I` definitions).

- add `filecontentsdefmacro` environment.

- extend `filecontentsdef` and `filecontentsdefmacro` environments as
  well as `\filecontentsprint` and `\filecontentsexec` macros to accept
  indifferently either a control sequence or a name as argument.

- refactor documentation, explain how to define wrapper environments.

v1.2 \[2016/09/19\]
-------------------

Initial version.

LICENSE
=======

This Work may be distributed and/or modified under the
conditions of the LaTeX Project Public License 1.3c.
This version of this license is in

> <http://www.latex-project.org/lppl/lppl-1-3c.txt>

and the latest version of this license is in

> <http://www.latex-project.org/lppl.txt>

and version 1.3 or later is part of all distributions of
LaTeX version 2005/12/01 or later.

The Author of this Work is:

- Jean-Francois Burnol `<jfbu at free dot fr>`

This Work consists of the main source file filecontentsdef.dtx and
its derived files filecontentsdef.sty, filecontentsdef.pdf,
filecontentsdef.dvi, README.md, INSTALL.md, README, INSTALL.
%</readme>
%<*install>
INSTALLATION
============

Use your installation manager.

Else, for manual installation:

- To extract the package and at the same time produce the documentation,
  execute latex thrice on `filecontentsdef.dtx` then `dvipdfmx` on the
  `dvi` file.

  To customize the PDF documentation (paper size, etc...): execute `etex`
  once on `filecontentsdef.dtx` then follow instructions given inside the
  extracted file `filecontentsdef.tex`.

- To extract the package but not necessarily build the documentation:
  run `etex` on `filecontentsdef.dtx`.

Files should then be moved to appropriate locations:

    filecontentsdef.sty -> TDS:tex/latex/filecontentsdef/
    filecontentsdef.dtx -> TDS:source/latex/filecontentsdef/
    filecontentsdef.pdf -> TDS:doc/latex/filecontentsdef/
    README.md           -> TDS:doc/latex/filecontentsdef/
    INSTALL.md          -> TDS:doc/latex/filecontentsdef/

You can also place `filecontentsdef.sty` directly within the directory
of the project using it.
%</install>
%<*tex>-------------------------------------------------------------------------
\chardef\Withdvipdfmx 1 % replace 1 by 0 for using pdflatex
\chardef\NoSourceCode 0 % replace 0 by 1 for the doc *without* the source code
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile {filecontentsdef.tex}[Driver for filecontentsdef documentation]%
\PassOptionsToClass   {a4paper,fontsize=11pt,oneside}{scrdoc}
\PassOptionsToPackage {english}{babel}
\input filecontentsdef.dtx
%%% Local Variables:
%%% mode: latex
%%% End:
%</tex>-------------------------------------------------------------------------
%<*none>------------------------------------------------------------------------
\fi\catcode`\^ 7
%
\chardef\noetex 0
\ifx\numexpr\undefined\chardef\noetex 1 \fi
\ifnum\noetex=1 \chardef\extractfiles 0 % extract files, then stop
\else
    \ifx\ProvidesFile\undefined
      \chardef\extractfiles 0 % etex etc.. on dtx, only file extraction.
    \else % latex/pdflatex
      \ifx\Withdvipdfmx\undefined
        % latex/pdflatex on dtx
        \chardef\extractfiles 1 % 1 = extract files and typeset manual, 2 = only typeset
        \chardef\Withdvipdfmx 1 % 0 = pdflatex or latex+dvips, 1 = dvipdfmx
        \chardef\NoSourceCode 0 % 0 =  include source code, 1 = do not
        \NeedsTeXFormat {LaTeX2e}%
        \PassOptionsToClass   {a4paper,fontsize=11pt,oneside}{scrdoc}%
        \PassOptionsToPackage {english}{babel}%
      \else % latex on tex
        \chardef\extractfiles 2 % do not extract files, only typeset
      \fi
      \ProvidesFile{\pkgname.dtx}%
        [\pkgname\space source and documentation (\dtxtimestamp)]%
    \fi
\fi
\ifnum\extractfiles<2 % extract files
\def\MessageDeFin{\newlinechar10 \let\Msg\message
\Msg{********************************************************************^^J}%
\Msg{*^^J}%
\Msg{* To finish the installation you have to move the following^^J}%
\Msg{* file into a directory searched by TeX:^^J}%
\Msg{*^^J}%
\Msg{*\space\space\space\space \pkgname.sty^^J}%
\Msg{*^^J}%
\Msg{* To produce the documentation with source code included run latex^^J}%
\Msg{* thrice on file \pkgname.tex and then dvipdfmx on \pkgname.dvi^^J}%
\Msg{*^^J}%
\Msg{* Happy TeXing!^^J}%
\Msg{*^^J}%
\Msg{********************************************************************^^J}%
}%
\begingroup
    \input docstrip.tex
    \askforoverwritefalse
    \def\pkgpreamble{\defaultpreamble^^J\MetaPrefix^^J%
    \string\NeedsTeXFormat{LaTeX2e}^^J%
    \string\ProvidesPackage{\pkgname}^^J%
    \space[\pkgdate\space\pkgversion\space\pkgdescription]}%
    \generate{\nopreamble\nopostamble
    \file{README.md}{\from{\pkgname.dtx}{readme}}%
    \file{INSTALL.md}{\from{\pkgname.dtx}{install}}%
    \usepostamble\defaultpostamble
    \file{\pkgname.tex}{\from{\pkgname.dtx}{tex}}%
    \usepreamble\pkgpreamble
    \file{\pkgname.sty}{\from{\pkgname.dtx}{package}}}%
\endgroup
\fi % end of file extraction (from etex/latex/pdflatex run)
\ifnum\extractfiles=0 % tex/etex/xetex/etc files extracted, stop
      \MessageDeFin\expandafter\end
\fi
% From this point on, run is necessarily with e-TeX.
% Check if \MessageDeFin got defined, if yes put it at end of run.
\ifdefined\MessageDeFin\AtEndDocument{\MessageDeFin}\fi
%-------------------------------------------------------------------------------
% START OF USER MANUAL TEX SOURCE
\documentclass[abstract]{scrdoc}

\ifnum\NoSourceCode=1 \OnlyDescription\fi

\usepackage{ifpdf}
\ifpdf\chardef\Withdvipdfmx 0 \fi

\makeatletter
\ifnum\Withdvipdfmx=1
   \@for\@tempa:=hyperref,bookmark,graphicx,xcolor,pict2e\do
            {\PassOptionsToPackage{dvipdfmx}\@tempa}
   %
   \PassOptionsToPackage{dvipdfm}{geometry}
   \PassOptionsToPackage{bookmarks=true}{hyperref}
   \PassOptionsToPackage{dvipdfmx-outline-open}{hyperref}
   \PassOptionsToPackage{dvipdfmx-outline-open}{bookmark}
   %
   \def\pgfsysdriver{pgfsys-dvipdfm.def}
\else
   \PassOptionsToPackage{bookmarks=true}{hyperref}
\fi
   \let\original@check@percent\check@percent
   \let\check@percent\relax
\makeatother

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[hscale=0.66,vscale=0.75]{geometry}
\pagestyle{headings}

\def\MacroFont{\ttfamily\small\hyphenchar\font45 \baselineskip11pt\relax}
\AtBeginDocument{\def\MacroFont{\ttfamily}}

% ATTENTION: (avec doc.sty ou les classes scrdoc ou ltxdoc)
%
% - l'environnement macrocode se fait avec \macro@font qui est le
% \MacroFont du \begin{document}.
%
% - les environnements verbatim utilisent le \MacroFont courant.
%
% - \verb utilise un \ttfamily !! et non pas \verbatim@font que l'on
% peut customiser.
%
% - (9 mars 2015) il ne faut PAS commencer des macrocode directement après
% un \section, il faut un paragraphe (par exemple un \indent\par)

\usepackage{xspace}
\usepackage[dvipsnames]{xcolor}

\definecolor{joli}{RGB}{225,95,0}
\definecolor{JOLI}{RGB}{225,95,0}

\newcommand\fcdname{%
  \texorpdfstring{{\color{joli}\ttfamily\bfseries \pkgname}}{\pkgname}\xspace}

\DeclareRobustCommand\csa[1]{{\ttfamily\hyphenchar\font45 \char`\\ #1}}

\newcommand\csh[1]{\texorpdfstring{\csa{#1}}{\textbackslash\detokenize{#1}}}

\usepackage{babel}

\usepackage[pdfencoding=pdfdoc]{hyperref}
\hypersetup{%
linktoc=all,%
%% bookmarksdepth=3,%
breaklinks=true,%
colorlinks,%   
linkcolor=OliveGreen,%RoyalBlue,%
urlcolor=RoyalBlue,%OliveGreen,%
pdfauthor={Jean-Fran\c cois Burnol},%
pdftitle={The \pkgname\space package},%
pdfsubject={\pkgdescription},%
pdfkeywords={LaTeX, verbatim, macros},%
pdfstartview=FitH,%
pdfpagemode=UseOutlines}
\usepackage{bookmark} 

\usepackage[zerostyle=a,scaled=0.95,straightquotes]{newtxtt}
\renewcommand\familydefault\sfdefault
\frenchspacing

\usepackage{framed}

%\usepackage{varioref}

%\usepackage{footnotehyper}

\usepackage{filecontentsdef}

\makeatletter
% \hbox needed since change to \smash and other macros at LaTeX 2018/12/01
\def\NewWith #1{\@bsphack
    \vadjust{\vskip-\dp\strutbox
             \hbox{\smash{\hbox to 0pt {\hss\color[named]{Thistle}%
                        \normalfont\small\bfseries
                        \hsize 2.5cm\rightskip.5cm minus.5cm
                        \vtop{\noindent New with #1}\kern.25cm }}}%
             \vskip\dp\strutbox }\strut\@esphack}
\def\ChangedAt #1{\@bsphack
    \vadjust{\vskip-\dp\strutbox
             \hbox{\smash{\hbox to 0pt {\hss\color[named]{Thistle}%
                        \normalfont\small\bfseries
                        \hsize 2.5cm\rightskip.5cm minus.5cm
                        \vtop{\noindent Changed at #1}\kern.25cm }}}%
             \vskip\dp\strutbox }\strut\@esphack}
\makeatother

\begin{document}
\rmfamily
\thispagestyle{empty}

\bookmark[named=FirstPage,level=1]{Title page}

%\ttzfamily

{%
\normalfont\Large\parindent0pt \parfillskip 0pt\relax
 \leftskip 2cm plus 1fil \rightskip 2cm plus 1fil
 The \fcdname package\par
}

{\centering
  \textsc{Jean-François Burnol}\par
  \footnotesize
  jfbu (at) free (dot) fr\par
  Package version: \pkgversion\ (\pkgdate);
            documentation date: \pkgdocdate.\par
  {From source file \texttt{\pkgname.dtx (\dtxtimestamp)}}\par
}

\begin{abstract}
  This lightweight LaTeX2e package provides an environment
  |filecontentsdef| which is like the |filecontents|
  environment of \textsc{Scott Pakin}'s
  \href{https//ctan.org/pkg/filecontents}{filecontents} package but in
  addition to the file creation stores the (verbatim) contents into a
  macro given as an additional argument (either as a control sequence or
  as a name).

  Displaying verbatim these contents is possible via
  |\filecontentsprint|, and executing them (if they represent LaTeX
  code) via |\filecontentsexec|.

  A variant environment |filecontentsdefmacro| stores the contents into
  a macro, but skips the save-to-a-file part.

  I developed this to display \TeX\ code verbatim in documentation
  and simultaneously produce during the LaTeX run the corresponding
  files in order to embed them in the PDF as \emph{file attachment
    annotations} (via the services of \textsc{Scott Pakin}'s
  further package
  \href{https://ctan.org/pkg/attachfile}{attachfile}.)
\end{abstract}

\tableofcontents

\section{Environments and macros}

\subsection{\textcolor[named]{PineGreen}{\texttt{filecontentsdef}},
            \textcolor[named]{PineGreen}{\texttt{filecontentsgdef}}}

The |filecontentsdef| environment is like |filecontents| but
requires a second argument. This argument will either be:
\begin{itemize}
\item a single control sequence token such as |\foo|,
\item or anything else which then must after expansion be
  usable as a macro \emph{name} (it will be handled via
  |\csname...\endcsname| encapsulation).
  For example \texttt{\string\myitemnumber\{3\}} can be used as argument and
  it will then be expanded inside \texttt{\string\csname...\string\endcsname}
  to construct a control sequence, whose name will possibly contain digits or
  other characters of non-letter catcodes. A single active character is
  allowed as long as its expansion is
  \texttt{\string\csname...\string\endcsname} compatible; the character itself
  will \emph{not} be assigned a new meaning.
\end{itemize}

Thus the syntax is either:
\begin{verbatim}
    \begin{filecontentsdef}{<filename>}{\foo}
    ... arbitrary contents ...
    \end{filecontentsdef}
\end{verbatim}
or:
\begin{verbatim}
    \begin{filecontentsdef}{<filename>}{(expanding to) macro name}
    ... arbitrary contents ...
    \end{filecontentsdef}
\end{verbatim}

The environment creates the file and stores its (verbatim) contents into its
second argument |\foo| (or into the  macro |\<macro name>| with given name).

\begin{framed}
  Hint: if some |\foo| contains the \emph{name} of the macro to be defined, use
  |\empty\foo| as argument, thus avoiding |\foo| itself to get overwritten by
  the environment.
\end{framed}

\begin{enumerate}
\item The starred variant |filecontentsdef*| acts like
  |filecontents*| environment regarding the file contents, i.e.
  it drops addition of a (\TeX) commented out header.
\item |filecontentsdefstarred| is an alias for
  |filecontentsdef*|.\NewWith{v1.5}
\item The contents put into the macro are the same for the starred and
  non-starred environments: neither contains a commented-out header.
\item The scope of the macro definition is
  \textbf{local}.\ChangedAt{v1.5}
\item 
  Use |filecontentsgdef| for a definition with global scope.\NewWith{v1.5}
\item No check is done on whether the defined macro pre-existed.
\item The macro holds a verbatim rendering of the contents, with active spaces
  and active |^^M| tokens.
\item The handling of the\NewWith{v1.5}
  Form Feed and Tabulation characters can be, contrarily to the |filecontents|
  treatment, customized. See \autoref{sec:tab}.
\item Babel shorthands will be neutralized the same way they are when
  encountered in a verbatim environment or in a |filecontents|
  environment. Their action is reactivated if the macro (assuming the
  contents represent \LaTeX\ code) gets later executed via
  \csa{filecontentsexec}.
\item The environment can be used either in the preamble or the body
  of the document.
\item The contents must not contain themselves a
  \texttt{\string\end}|{filecontentsdef}| (or \texttt{\string\end}|{filecontentsdef*}| in the
starred case).
% problème avec Emacs/AUCTeX et |\end{...}| qui fait boguer le fontlock
% bizarrement le deuxième ne pose pas de problème. 19 avril 2019.
\end{enumerate}

\begin{footnotesize}
  Here are some additional relevant details:
\begin{enumerate}
\item the usual special characters are sanitized like they would be in a
  verbatim environment,
\item the space becomes the active character of ascii code |32|,
\item the end of line is converted into the active character |^^M| (i.e. ascii
  code |13|),
\item see \autoref{sec:tab} for the handling of the horizontal tabulation
  and form feed characters,
\item the active bytes of ascii code between |128| and |255| (this is now
  systematically the case with |inputenc+utf8| being default) are stored
  into the produced macro ``as is'',
\item the non-active bytes of ascii code between |128| and |255| are
  stored into the produced macro with catcode letter.
\end{enumerate}
These last two items together mean that 8bit or UTF8-encoded characters will
display as expected in a verbatim rendering, see \csa{filecontentsprint} next.
\par
\end{footnotesize}

\subsection{\textcolor[named]{PineGreen}{\texttt{filecontentsdefmacro}},
            \textcolor[named]{PineGreen}{\texttt{filecontentsgdefmacro}}}

This environment
\begin{verbatim}
    \begin{filecontentsdefmacro}{\foo or macro name}
    ... arbitrary contents ...
    \end{filecontentsdefmacro}
\end{verbatim}
was added at |v1.4|. It is like |filecontentsdef| without the
``save to file'' part... and has thus a sole mandatory argument which may be
either a control sequence or a name (or material expanding to name), as
previously described. The macro can then be either printed verbatim via
\csa{filecontentsprint} or, if it consists of \LaTeX\ code, be executed in
re-tokenized form via \csa{filecontentsexec}.

Its name is thus a bit paradoxical but was chosen to share an existing prefix
with the other package macros and environments.

\subsection{\textcolor[named]{PineGreen}{\csh{filecontentsprint}},
\textcolor[named]{PineGreen}{\csh{FCDprintenvname}},
\textcolor[named]{PineGreen}{\csh{FCDprintenvoptions}}}


\csa{filecontentsprint} has a
unique mandatory argument which will be either:
\begin{itemize}
\item a single control sequence token (for example |\foo|),
\item or anything else which then must after expansion be
  usable as a macro \emph{name} (for example |macro|). It will be handled via
  |\csname...\endcsname| encapsulation (see earlier explanations).%
\end{itemize}
The |\foo| must be of the type constructed by the environments
|filecontentsdef| or |filecontentsdefmacro|. It will be then be printed exactly as
\begingroup\makeatletter\def\x{\let\@xverbatim\relax
       \verbatim
\string\begin\string{verbatim\string}\par
<contents of \string\foo>\par
\string\end\string{verbatim\string}\par
\endverbatim%
\endgroup}\x
would have done.

This uses underneath the |verbatim| environment and has been
  tested to be compatible with the standard |verbatim|, with the one from
  package \href{http://www.ctan.org/pkg/doc}{doc} (classes |ltxdoc.cls|,
  |scrdoc.cls|) and also with the one from package
  \href{http://www.ctan.org/pkg/verbatim}{verbatim} (whose mechanism is quite
  different from the one of the default |verbatim| environment.)

\begin{framed}
  Due to limitation of the |verbatim| environment, the
  \texttt{\string\end}|{verbatim}| must not appear inside the contents... else
  it will be misconstrued as ending the external |verbatim| environment itself
  which is added by \csa{filecontentsprint}!

  This limitation only
  affects \csa{filecontentsprint}, not \csa{filecontentsexec}.
\end{framed}

The name of the used environment is held in macro
\textcolor[named]{PineGreen}{\csa{FCDprintenvname}}.\NewWith{v1.5}
Redefine it to modify the environment name from its default |verbatim|.

Furthermore\NewWith{v1.5} the macro
\textcolor[named]{PineGreen}{\csa{FCDprintenvoptions}} can be used to pass
options to that environment.

Here is a set-up using |fancyvrb| which I tested with success:
\begin{verbatim}
\documentclass{article}
\usepackage{filecontentsdef}
\usepackage{xcolor}
\usepackage{fancyvrb}
\usepackage{fvextra}

% store tabs as active characters so they can be handled by fancyvrb
{\catcode`\^^I=\active\gdef\FCDtabtomacro{\noexpand^^I}}

% Use fancyvrb Verbatim environment
\renewcommand*\FCDprintenvname{Verbatim}

% with these options. This will be submitted to an \edef, so we
% simply wrap in \unexpanded to avoid problems
\renewcommand*\FCDprintenvoptions{%
  \unexpanded{[fontsize=\scriptsize, highlightlines={1, 3-4},
               numbers=both, showspaces, spacecolor=red,
               showtabs, %tab=\rightarrowfill% incompatible with linebreaks?
               breaklines,breakbefore=\\\space]}%
}
\begin{filecontentsdefmacro}{\testfancyvrb}
some contents with long lines and tabs to test the options
\end{filecontentsdefmacro}
\end{verbatim}

Here is now a set-up with |minted| which worked also (although the syntax
highlighting was not handling correctly control sequences using the @ letter,
but I am not knowledgeable enough in the Pygmentize library):

\begin{verbatim}
\documentclass{article}% needs shell-escape
\usepackage{filecontentsdef}
\usepackage{minted}
\newminted{tex}{linenos}

\renewcommand*\FCDprintenvname{texcode}

\begin{filecontentsdefmacro}{\testminted}
some TeX macros
\end{filecontentsdefmacro}

\begin{document}
\filecontentsprint\testminted
\end{document}
\end{verbatim}

\subsection{\textcolor[named]{PineGreen}{\csh{filecontentsprintviascan}}}

It is not possible to use a |listings| environment via \csa{filecontentsprint}
and \csa{FCDprintenv}, because |listings| has a special way to identify where
it ends and this is incompatible with the \csa{filecontentsprint} approach.

At |v1.5| 
\csa{filecontentsprintviascan} is added\NewWith{v1.5} which is more powerful
than \csa{filecontentsprint} as it should work not only with verbatim
environments known to be compatible with \csa{filecontentsprint} but
also with environments of the |listings| type. But this requires \eTeX{}
\csa{scantokens} (it uses \csa{filecontentsexec}, see next).%
%
\footnote{I know that the \LaTeX{} kernel itself requires \eTeX{} for a few
  years now, but \fcdname could have been installed on an old machine...}

Here is an example of usage which worked for me (although the syntax
highlighting, like the one from |minted|, was not fully satisfying):

\begin{verbatim}
\documentclass{article}
\usepackage{filecontentsdef}
\usepackage{xcolor}
\usepackage{listings}
\lstnewenvironment{latexverbatim}
 {\lstset{
     basicstyle=\small\ttfamily,
     breaklines=true,
     columns=fullflexible,
     language=[LaTeX]TeX,
     numbers=left,
     numbersep=1em,
     numberstyle=\tiny\color{gray},
     keywordstyle=\color{red}}}{}

\renewcommand*\FCDprintenvname{latexverbatim}

\begin{document}

\begin{filecontentsdefmacro}{\testlistings}
\gdef\filecontentsprintviascan{\FCD@get\FCD@printviascan}%
\gdef\FCD@printviascan#1{%
   \toks@\expandafter{#1}%
   \edef\FCD@envwithcontents{%
        \noexpand\begin{\FCDprintenvname}\FCDprintenvoptions\noexpand^^M%
        \the\toks@\@backslashchar end{\FCDprintenvname}\noexpand^^M}%
   \FCD@exec\FCD@envwithcontents}%
\end{filecontentsdefmacro}

\filecontentsprintviascan\testlistings
\end{document}
\end{verbatim}

\subsection{\textcolor[named]{PineGreen}{\csh{filecontentsexec}}}

Although \fcdname itself generally does not require \eTeX, it provides as a
convenience \csa{filecontentsexec} which
does require it as it uses |\scantokens| to re-assign the current catcode
regime to the verbatimized tokens stored into its mandatory argument. Again
the mandatory argument may have one of the two forms described previously.

And of course this assumes that the tokens provide legitimate \LaTeX\ code.

\begin{footnotesize}
  \textbf{TeX-hacker note:} No group is used in order to not create an extra
  scoping of the executed macro contents.

  \textbf{TeX-hacker note:} In the case of storage in a macro of some \LaTeX{}
  contents, and re-parsing via |\filecontentsexec| which uses
  |\scantokens|, the last line before the
  \texttt{\string\end}|{filecontentsdef}|
  or |\end{filecontentsdefmacro}| potentially generates an end of line
  character, typically a space token (but this depends on the
  \csa{endlinechar} valid at this location
  setting). Such a space coming from the last end of line has no impact if
  the \LaTeX{} contents get executed in vertical mode. In horizontal mode it
  will be avoided if these contents end with a |%|
  or also with some control sequence such as a |\relax| or
  |\empty| (only if \csa{endlinechar} is standard).

  At |v1.5|\NewWith{v1.5} a special convention is added that if the
  \texttt{\string\end}|{filecontentsdef}| (or variants) stands on
  the same line as the last line of the contents, rather than being on
  a line of its own, then the stored contents will get postfixed with
  an added \csa{empty} token. Thus execution via
  \csa{filecontentsexec} in horizontal mode will not induce any ending
  space token (assuming the \csa{endlinechar} is then at its standard
  setting). This feature is to be used only with contents representing
  \TeX{} macros, as the \csa{empty} makes sense only in that context.
  This token will remain invisible in the PDF output from
  \csa{filecontentsprint}.

  No \csa{empty}
  gets added to the last line of the exported file (if there is one).
  The original |filecontents| environment issues a warning when there is
  contents before the end of the environment on the same line, this warning is
  now skipped.\ChangedAt{v1.5}

  This extra \csa{empty}
  added only under such special usage of the environment is not currently
  customizable, but I can add such a feature if there is a user request.

  \textbf{TeX-hacker note:} one should not think that using
  \csa{filecontentsexec} with some stored material will behave like copying
  pasting that material directly at that very location of the source code: for
  example if the last line ends with a |%|
  this does not mean that this will comment out what is next in the source
  code on the same line after the \csa{filecontentsexec}! It is more analogous
  to making first a macro definition with the contents and then execute that
  macro. But it is not possible for some macro from inside these contents to
  itself grab tokens coming next after the \csa{filecontentsexec}\csa{foo}
  (moreover, \fcdname adds tokens of its own in order restore the
  \csa{newlinechar}).


\end{footnotesize}

\subsection{\textcolor[named]{PineGreen}{\texttt{filecontentshere}}}

This environment
\begin{verbatim}
    \begin{filecontentshere}{<filename>}
    ... arbitrary contents ...
    \end{filecontentshere}
\end{verbatim}
creates on the fly a file with these contents, and simultaneously
it typesets them in a verbatim environment. It is a shortcut to doing
\begin{verbatim}
    \begin{filecontentsdef}{<filename>}{\filecontentsheremacro}
    ... arbitrary contents ...
    \end{filecontentsdef}
\end{verbatim}
and then immediately
\begin{verbatim}
    \filecontentsprint\filecontentsheremacro
\end{verbatim}
The |\filecontentsheremacro| is then available for usage as argument
of |\filecontentsexec|. Since |v1.5| its definition has only
local scope.
\ChangedAt{v1.5}

The environment has a starred variant 
|filecontentshere*| (also |filecontentsherestarred|) which does the
expected thing.

For example
\begin{verbatim}
\begin{filecontentshere*}{\jobname.test}
  \begin{framed}
    \noindent 
                We have coded this in \LaTeX: both
      $E=mc^2$ (input as \verb|$E=mc^2$|)
    and     $E=h\nu$  owe much    to \textsc{Albert Einstein}.
  \end{framed}
\end{filecontentshere*}
\filecontentsexec\filecontentsheremacro
\end{verbatim}
will produce an external file with the above contents and have this
effect in the document (verbatim framed then real framed):
\begin{filecontentshere*}{\jobname.test}
  \begin{framed}
    \noindent 
                We have coded this in \LaTeX: both
      $E=mc^2$ (input as \verb|$E=mc^2$|)
    and     $E=h\nu$  owe much    to \textsc{Albert Einstein}.
  \end{framed}
\end{filecontentshere*}
\filecontentsexec\filecontentsheremacro

\section{How to wrap usage of \texttt{filecontentsdef} in another
  environment}

Don't use the |\begin/\end| syntax but directly
|\begingroup\filecontentsdef{..}{..}| and |\endfilecontentsdef\endgroup|.
And these should come last, respectively first, in the definition of the
begin, respectively end, part of the new environment.

The extra |\begingroup...\endgroup| are mandatory with the
\fcdname environments making a local scope definition.\ChangedAt{v1.5}

For those creating global scope macros, |\begingroup...\endgroup|
is recommended, as the \LaTeX{} state is not completely clean
after |\endfilecontentsgdef| (et al.) execution. Thus it is
better to have the extra |\begingroup...\endgroup| pair always
(which are a part of the things added by the |\begin/\end| syntax).

For wrapping the starred variant one needs to use
|\csname filecontentsdef*\endcsname|, or make the definition with |*|
having catcode letter. A simpler way is to use the alias ending
in |...starred|.\NewWith{v1.5} Regarding the ending macro its
name can drop the |*|, as the starred environments defined by the
\fcdname package use the same ending macros as their non-starred
variants.

As exercise, let's imagine we want an environment which will be associated
to some counter, will automatically increment it at each usage, and will
use this counter to index the files and macros created on each
invocation.
Except if you know how to smuggle how a macro from an environment
you probably want to use |filecontentsgdef| in order for the
macro to have global scope.
\begin{filecontentsdefmacro}{\pablo}
\newcounter{pablo}
\newenvironment{defexercise}
   {\stepcounter{pablo}%
    \begingroup
    \filecontentsgdefstarred
    {\jobname-ex\the\value{pablo}}{exercise-\the\value{pablo}}}%
   {\endfilecontentsgdefstarred\endgroup}
\newcommand{\printexercise}[1]{\filecontentsexec{exercise-\the\numexpr#1\relax}}
\end{filecontentsdefmacro}
\filecontentsprint\pablo
\filecontentsexec\pablo

We can then use it this way:
\begin{filecontentsdefmacro}{\usepablo}
\begin{defexercise}
   Prove that \[x^n+y^n=z^n\]  is not solvable in positive integers if $n$ is at
   most $-3$.\par  
\end{defexercise}
\begin{defexercise}
   Refute the existence of black holes in less than 140 characters.\par 
\end{defexercise}
\begin{defexercise}
  \def\NSA{NSA}%
  Prove that factorization is easily done via probabilistic algorithms and
  advance evidence from knowledge of the names of its employees in the
  seventies that the \NSA\ has known that for 40 years.\par
\end{defexercise}
\begin{itemize}
\item \printexercise{3}
\item \printexercise{2} 
\item \printexercise{1}
\end{itemize}
\end{filecontentsdefmacro}
\filecontentsprint\usepablo

This produces in the document:
\filecontentsexec\usepablo
Additionally, three small files were created containing the \LaTeX\ mark-up
for each exercise.


\section{How to customize handling of tabulation and form feed characters}
\label{sec:tab}

\LaTeX{} assigns catcode 10 by default to |^^I| meaning that it is handled by
default as a space character:
\begin{filecontentsdefmacro}{\coucou}
\def\test{^^I}
\ifx\test\space \textcolor{blue}{OK}\else \ERROR\fi
\end{filecontentsdefmacro}
\filecontentsprint\coucou
\filecontentsexec\coucou

But \fcdname like the original |filecontents| environment assigns active
catcode to the tabulation character before parsing the contents. This allows
special treatment.

\begin{framed}
  Attention that if input as |^^I| (in opposition to the real ascii character
  of ascii code 9), it will end up simply as |^^I| in external file or macro,
  because the caret loses its special meaning in the environment.

  The discussion in this section about customizing \fcdname behaviour applies
  only to a source with a real tabulation character, not one in \TeX{} notation
  |^^I|.
\end{framed}

With
|v1.5|, \fcdname diverges from original |filecontents| by adding the means to
customize the handling of such tabulation character, rather than simply raising
a warning and exporting it as a space like original |filecontents|. And also
the handling of the form feed character can be customized.

This is controlled via four control sequences whose default definitions are
the following:\NewWith{v1.5}
\begin{verbatim}
\def\FCDtabtofile{ }%

{\catcode32\active\gdef\FCDtabtomacro{\noexpand }}%

\def\FCDformfeedtofile{^^J^^J}%

{\catcode`\^^M\active\gdef\FCDformfeedtomacro{\noexpand^^M\noexpand^^M}}%
\end{verbatim}

Each of \csa{FCDtabtofile}, \csa{FCDtabtomacro},
\csa{FCDformfeedtofile}, \csa{FCDformfeedtomacro} gets used via an
expansion inside an \csa{edef}, hence the need for \csa{noexpand} in front
of active characters. The |^^J| in \csa{FCDformfeedtofile} matches
the default newline character (ascii code 10) of \LaTeX{} for
exporting files. The active |^^M| is used for macro storage
because this is the most suitable for verbatim printing via
\csa{filecontentsprint} as typically in a verbatim environment end
of lines get converted into such active |^^M| (which will create
a |\par| token).

If you want for example tabulation characters to get converted into four
spaces, use:
\begin{verbatim}
\def\FCDtabtofile{\space\space\space\space}%
{\catcode32\active\gdef\FCDtabtomacro{\noexpand \noexpand \noexpand \noexpand }}%
\end{verbatim}
I have here used for macro storage active spaces. The \csa{noexpand} are
mandatory in such case, but they will disappear from stored contents in a
macro. We could also have defined \csa{FCDtabtofile} as an alias to
\csa{FCDtabtomacro} here because a non-expanding active space will simply give a
space in the external file. Due to \TeX{} tokenization rules
|\def\FCDtabtofile{    }| would be the same as with only one single space and
thus we used |\space\space\space\space|.

If you want an actual tabulation character stored to a file, use:
\begin{verbatim}
{\catcode`\^^I=12 \gdef\FCDtabtofile{^^I}}
\def\FCDtabtomacro{TAB}
\end{verbatim}
The second line is for demonstration only as an example of how to store the
tabulation character in a macro, use anything adequate to replace \texttt{TAB}
as used here. For example you can store in it the actual tabulation (ascii code
9) with catcode 12, via using rather |\let\FCDtabtomacro\FCDtabtofile| in the
above. Or use some Unicode symbol and appropriate font configuration.

Here is an example. This is rendered via |verbatim| which will treat the
tabulation characters as spaces, but they are there in the original:
\begin{verbatim}
{\catcode`\^^I=12 \gdef\FCDtabtofile{^^I}}
\let\FCDtabtomacro\FCDtabtofile
\begin{filecontentshere}{\jobname-tab.test}
Here is a tab	and then three in a row			.
\end{filecontentshere}
(we will see them in the PDF output via the glyph at slot 9 of the T1 encoding).
\end{verbatim}
Here is what the original produces indeed when executed:
{\catcode`\^^I=12 \gdef\FCDtabtofile{^^I}}
\let\FCDtabtomacro\FCDtabtofile
\begin{filecontentshere}{\jobname-tab.test}
Here is a tab	and then three in a row			.
\end{filecontentshere}
The way it looks in the PDF is due to our definition of \csa{FCDtabtomacro}
which gives a catcode12 character of ascii code 9, and we use T1
font-encoding. The exported file does contain on the other hand as promised a
real tabulation character.

\begin{footnotesize}
  \begin{framed}
    \LaTeX{} since 2018 uses by default |\usepackage[utf8]{inputenc}| and
    almost all control characters are given active catcode. Exceptions: |^^@|
    (illegal), |^^I| (treated as space), |^^J| (for some reason it gets catcode
    12 and thus will if printed to PDF give the glyph at slot 10 of the font
    encoding), and |^^M| (end of line).

    Notice that such a control character which in the source gets input using
    \TeX{} notation, for example |^^P|, causes no issue to \fcdname as the
    caret |^| has lost its special catcode. Thus a |^^P| will be printed to
    external file.

    If one tries to use directly in the source the CTRL-P, an error will be
    raised by \LaTeX{} triggered by the active character (\fcdname does not
    sanitize catcodes in this ascii range, as original |filecontents|
    environment does not either).

    One can always reassign catcodes, thus you can set the catcode of |^^P| to
    12 for example. However, when exporting such a control character with
    catcode 11 or 12 to a file, pdflatex uses |^^| notation in the output.
    There are three exceptions (with |pdflatex|): the horizontal tabulation (ascii code 9,
    |^^I|), the line feed (ascii code 10, |^^J|), and vertical tabulation
    (ascii code 11, |^^K|) are exported to the file as the corresponding ascii
    characters (at least this is the case with \TeX Live). \emph{These
      exceptions do not apply with} |xelatex|.

    Thus we again end up with \TeX{} notation |^^P| in the exported file. To
    get a literal CTRL-P, you need to set the catcode of |^^P| to 11 or 12, and
    to run |pdflatex| with the |-8bit| option. With Xe\LaTeX, this would be
    needed even for the horizontal tabulation CTRL-I. 
  \end{framed}
\end{footnotesize}

\begin{footnotesize}

\section{How to obtain customized verbatim in the output}

Please refer first to the discussion of \csa{filecontentsprint} and
\csa{filecontentsprintviascan} as it provides examples using |fancyvrb|,
|minted|, or |listings| environments which may be what you are looking for.

Here we make quick comments on alternatives to using \csa{filecontentsprint},
and handling directly the contents via the configuration of active spaces and
active end of lines.

Here is
some (non-\LaTeX) text snippet.
\begin{verbatim}
\begin{filecontentsdef}{\jobname.test2}{\testactive}
v1.2 \[2016/09/19\]
-------------------

Initial version.

test: éèàùÉÈÇÀÙÛÎåðñòóôõöœøùúûüýþßŸŽ§
\end{filecontentsdef}
\end{verbatim}

We can expand \csa{testactive} directly inside the \LaTeX\ document, but must
give some definitions to the active space token and the active |^^M| token
like |verbatim| environment does.

For a true verbatim printout \csa{obeyspaces} and \csa{obeylines} are not
enough because spaces at start of lines will disappear, and multiple empty
lines give multiple |\par|'s which collapse into a single one (hence no empty
line can be observed in the output). The usual |verbatim| environment uses a
special definition of |\par| which prevents the disappearance of empty lines,
and for the spaces it has macro \csa{@vobeyspaces} which makes the spaces
issue |\leavevmode| so they are not skipped at the start of lines. Let's
define:
\begin{verbatim}
\makeatletter
% this redefines active spaces, but does not make spaces active
\def\niceactivespaces{\@vobeyspaces\catcode32=10\relax}% 
\makeatother
\begingroup
% this redefines active end of lines, but does not make them active
  \catcode`\^^M\active %
  \gdef\niceactiveCRs{\def^^M{\leavevmode\par}}%
\endgroup %
\end{verbatim}

Then we can issue something like:
\begin{verbatim}
{\setlength{\parindent}{2cm}\niceactivespaces\niceactiveCRs\testactive\par}
\end{verbatim}
This allows hyphenation and ligatures, which are usually inhibited in standard
|verbatim|, and it does not switch to the monospace font. Here is what happens
if we do all of the above, as a test:

\def\testactive{testactive}
\begin{filecontentsdefmacro}{\empty\testactive}
v1.2 \[2016/09/19\]
-------------------

Initial version.

test: éèàùÉÈÇÀÙÛÎåðñòóôõöœøùúûüýþßŸŽ§
\end{filecontentsdefmacro}
\makeatletter
% this redefines active spaces, but does not make spaces active
\def\niceactivespaces{\@vobeyspaces\catcode32=10\relax}% 
\makeatother
\begingroup
% this redefines active end of lines, but does not make them active
  \catcode`\^^M\active %
  \gdef\niceactiveCRs{\def^^M{\leavevmode\par}}%
\endgroup %
{\setlength{\parindent}{2cm}\niceactivespaces\niceactiveCRs\testactive\par}
We see indeed how the |---...--| gave rise to ligatures, and that the
monospace font was not used. This was only to give an idea of how one can use
the macros created by the |filecontentsdef| or |filecontentsdefmacro|
environments for variant verbatim rendering. This technique can be used as
workaround to the problem with \csa{filecontentsprint} that the contents can
not contain \verb|\end{verbatim}|.

\end{footnotesize}

\section{Related packages}

\begin{itemize}
\item Scott~\textsc{Pakin}'s
  \href{http://www.ctan.org/pkg/filecontents}{filecontents}. Notice that the
  package functionality has been integrated into \LaTeX{} release dated
  |2019/10/01|.
\item Pablo~\textsc{González}'s
  \href{http://www.ctan.org/pkg/scontents}{scontents}. Make sure your version
  is at least |v1.3| as earlier ones had a dependency on \fcdname
  and are broken by the changes coming with |filecontentsdef v1.5|.
\end{itemize}


\StopEventually{\end{document}}

\clearpage

\makeatletter
    \let\check@percent\original@check@percent
\makeatother

\small

\section{Implementation}

See the \texttt{README.md} file for the \texttt{CHANGE LOG}.

% \indent % !!!!!!!!!!!!!!!!! Lundi 09 mars 2015 à 09:32:22


\makeatletter
\begingroup
\topsep\MacrocodeTopsep
\trivlist\parskip\z@\item[]
\macro@font
\leftskip\@totalleftmargin  \advance\leftskip\MacroIndent
\rightskip\z@  \parindent\z@  \parfillskip\@flushglue
\global\@newlistfalse \global\@minipagefalse
\ifcodeline@index
  \everypar{\global\advance\c@CodelineNo\@ne
  \llap{\theCodelineNo\ \hskip\@totalleftmargin}}%
\fi
\string\NeedsTeXFormat\string{LaTeX2e\string}[1999/12/01]\par
\string\ProvidesPackage\string{\pkgname\string}\par
\noindent\space [\pkgdate\space\pkgversion\space\pkgdescription]\par
\nointerlineskip
\global\@inlabelfalse
\endtrivlist
\endgroup
\makeatother

% The catcode hackery next is to avoid to have <*package> to be listed
% in the commented source code...
% (c) 2012/11/19 jf burnol ;-)

\MakePercentIgnore

%
% \catcode`\<=0 \catcode`\>=11 \catcode`\*=11 \catcode`\/=11
% \let</none>\relax
% \def<*package>{\catcode`\<=12 \catcode`\>=12 \catcode`\*=12 \catcode`\/=12}
%
%</none>
%<*package>
%    \begin{macrocode}
\let\FCD@global\global
\begingroup
\catcode`\^^M\active%
%    \end{macrocode}
% Attention that all end of lines must now get protected due to
% the end of line character being active.
%
% The \LaTeX{} default for active |^^L| was \csa{outer} up to the |2017-01-01|
% release (got modified in |{v2.3b}{2016/11/06}| version of |ltplain.dtx|).
% But we must still handle that possibility for usage with older formats.
%    \begin{macrocode}
\catcode`\^^L\active\let^^L\relax%
\catcode`\^^I\active%
%    \end{macrocode}
% \csa{FCD@main} is the core construct.
%
% Bulk of the code is still identical to the one in \textsc{Scott Pakin}'s
% \href{http://www.ctan.org/pkg/filecontents}{filecontents} hence to the
% original one in \LaTeX's sources regarding \csa{filec@ntents}, as
% |filecontentsdef| was conceived as an extension of the original
% |filecontents| environment, with the added feature of storing the
% verbatimized contents in a \TeX{} macro, which can then be printed (verbatim)
% or re-tokenized later via \csa{scantokens} and executed (if it represents
% \LaTeX{} material). Starting with |v1.5| some renaming of internal macros
% appears and the original coding is not only extended but starts being
% modified at some places as well.
%
% |v1.4| adds \csa{filecontentsdefmacro} which does not write to a file.
%
% |v1.5| renames all internal macros to use |\FCD@| namespace prefix. This
% applies here to \csa{FCD@main} whose name was still \csa{filec@ntentsdef} at
% |v1.4|. The change also applies to the \csa{reserved@b} and \csa{reservec@c}.
%
% |v1.5| adds customizability of how tabulation and form feed characters are
% handled either in file output or in macro storage.
%
% |v1.5| modifies |filecontentsdef| to only make a definition with local
% scope. For this we must smuggle out of the environment both the name and the
% meaning of the control sequence to define. We prepare for this a
% \csa{FCD@defmacro} which gets executed via |\endfilecontentsdef| (and
% variants). As \csa{FCD@defmacro} issues \csa{endgroup}, direct usage of
% \csa{filecontentsdef} (not as environment) must be inside an explicit
% \csa{begingroup}/\csa{endgroup} pair, mimicking the one which an environment
% would insert.
%
% The |filecontentsgdef/filecontentsgdefmacro| environments do define
% \csa{FCD@defmacro} but do not execute it.
%    \begin{macrocode}
\gdef\FCD@main#1#2{%
  \def\FCD@defmacro%
     {\toks@\expandafter{#2}%
      \edef\x{\endgroup\def\noexpand#2{\the\toks@}%
              \begingroup\def\noexpand\@currenvir{\@currenvir}}%
      \x}%
  \FCD@global\let#2\@empty%
 \if@filesw%
  \openin\@inputcheck#1 %
  \ifeof\@inputcheck%
    \@latex@warning@no@line%
        {Writing file `\@currdir#1'}%
  \else%
    \@latex@warning@no@line%
        {Overwriting file `\@currdir#1'}%
  \fi%
  \closein\@inputcheck%
  \chardef\FCD@reserved@c15 %
  \ch@ck7\FCD@reserved@c\write%
  \immediate\openout\FCD@reserved@c#1\relax%
  \if@tempswa%
    \immediate\write\FCD@reserved@c{%
      \@percentchar\@percentchar\space%
          \expandafter\@gobble\string\LaTeX2e file `#1'^^J%
      \@percentchar\@percentchar\space  generated by the %
        `\@currenvir' \expandafter\@gobblefour\string\newenvironment^^J%
      \@percentchar\@percentchar\space from source `\jobname' on %
         \number\year/\two@digits\month/\two@digits\day.^^J%
      \@percentchar\@percentchar}%
  \fi%
 \fi%
  \let\do\@makeother\dospecials%
%    \end{macrocode}
% SP's |filecontents| sets here in the loop all catcodes to |11|, but we
% need for correct rendering in verbatim that the constructed macro
% stores active characters as active characters.
%
% We don't check for unusual active characters of ascii code |<128|
% as this is not done by original or SP's |filecontents|. But if
% present then they will expand similarly both in the |\write| and
% in the construction of the macro.
%    \begin{macrocode}
  \count@=128\relax%
  \loop%
    \ifnum\catcode\count@=\active%
          \lccode`~\count@%
          \lowercase{\def~{\noexpand~}}%
    \else%
          \catcode\count@=11 %
    \fi%
    \advance\count@ by \@ne%
    \ifnum\count@<\@cclvi%
  \repeat%
%    \end{macrocode}
% The default active |^^L| was |\outer| up to |2017/01/01|.
%    \begin{macrocode}
  \let^^L\relax%
  \edef\FCD@E{\@backslashchar end\string{\@currenvir\string}}%
  \edef\FCD@reserved@b{\def\noexpand\FCD@reserved@b####1\FCD@E####2\FCD@E####3\relax}%
%    \end{macrocode}
% \csa{filecontentsdefmacro} sets \csa{if@filesw} to false.
%    \begin{macrocode}
  \FCD@reserved@b{%
    \ifx\relax##3\relax%
      \if@filesw%
        \let^^L\FCDformfeedtofile%
        \let^^I\FCDtabtofile%
        \immediate\write\FCD@reserved@c{##1}%
      \fi%
%    \end{macrocode}
% This is where the original |filecontents| is extended to store the
% parsed material in a macro (in my very first hack I simply
% patched it to redefine |\write| to also do the macro storage, but
% considerations like the one relative to active characters due to
% |inputenc| made me decide to re-write the whole thing, hence make
% a new package.)
%
% Active characters were defined with a single |\noexpand| in the
% loop, and this is enough because after each new line is processed
% the characters it contains are protected from further expansion in
% the |\xdef|'s. And the single |\noexpand| is enough also for the
% |\write| done above.
%    \begin{macrocode}
      \toks@\expandafter{#2}%
      \let^^L\FCDformfeedtomacro%
      \let^^I\FCDtabtomacro%
      \FCD@global\edef#2{\the\toks@##1\noexpand^^M}%
    \else%
      \edef^^M{\noexpand\end{\@currenvir}}%
      \ifx\relax##1\relax%
      \else%
        \if@filesw%
%    \end{macrocode}
% |v1.5| suppresses the warning issued by |filecontents| environment
% in such case.
%    \begin{macrocode}
          \let^^L\FCDformfeedtofile%
          \let^^I\FCDtabtofile%
          \immediate\write\FCD@reserved@c{##1}%
        \fi%
%    \end{macrocode}
% In such case with the end of environment not being on a line of its own,
% |v1.5| injects an extra |\empty| token at end of last line. Thus
% usage in this form is restricted to contents representing \TeX{} macros.
% We still need the final |^^M| for \csa{filecontentsprint} matters.
%    \begin{macrocode}
        \toks@\expandafter{#2}%
        \let^^L\FCDformfeedtomacro%
        \let^^I\FCDtabtomacro%
        \FCD@global\edef#2{\the\toks@##1\noexpand\empty\noexpand^^M}%
      \fi%
      \ifx\relax##2\relax%
      \else%
         \@latex@warning{%
           Ignoring text `##2' after \string\end{\@currenvir}}%
      \fi%
    \fi%
    ^^M}%
%    \end{macrocode}
% |v1.4|: sync |^^L| and |^^I| with |2018/04/01| \LaTeX{} release.
%
% |v1.5|: drop the |^^L| and |^^I| \LaTeX{} definitions in favour of
% \csa{FCDformfeedtomacro} etc...
%    \begin{macrocode}
  \catcode`\^^L\active%
  \catcode`\^^I\active%
  \catcode`\^^M\active%
  \edef^^M##1^^M{\noexpand\FCD@reserved@b##1\FCD@E\FCD@E\relax}%
%    \end{macrocode}
% We need active space characters to be active in the produced macro.
% We only need to protect them once from expansion. The definition
% will work both for writing to a file and for storage into the macro.
%    \begin{macrocode}
  \catcode32\active\lccode`~32 \lowercase{\def~{\noexpand~}}%
}%
\gdef\FCDformfeedtofile{^^J^^J}%
\gdef\FCDformfeedtomacro{\noexpand^^M\noexpand^^M}%
\gdef\FCDtabtofile{ }%
\catcode32\active\gdef\FCDtabtomacro{\noexpand }%
\endgroup%
%    \end{macrocode}
% The |v1.4| macros accept a name as alternative to a macro. Empty or
% ill-formed |#2| will break code. But |#2| can be using |\if|, |\else|,
% |\fi| tokens, the whole thing will end up |\csname|-expanded. An active
% character also will end up |\csname|-expanded. There is no check on
% whether |#2| or |\csname#2\endcsname| is an existing macro.
%
% |v1.5| replaces \csa{@tempa,b} by \csa{FCD@tempa,b}. And its
% \csa{FCD@get@aux} directly grabs |#2| rather than issuing \csa{@firstofone}.
%    \begin{macrocode}
\long\def\FCD@get@aux#1\FCD@get@aux#2{#2}%
\def\FCD@get#1#2%
{%
  \def\FCD@tempa{#1}\def\FCD@tempb{{#2}}%
  \expandafter\FCD@get@aux\@gobbletwo#2\FCD@get@aux
  \@thirdofthree
  \FCD@get@aux
  {\ifcat\relax\noexpand#2\expandafter\@gobble\else\expandafter\@firstofone\fi}%
  {\edef\FCD@tempb{{\expandafter\noexpand\csname#2\endcsname}}}%
  \expandafter\FCD@tempa\FCD@tempb
}%
%    \end{macrocode}
% |v1.4| adds \csa{filecontentsdefmacro}. I abuse the \csa{if@filesw} toggle as
% there is no \csa{if@tempswb} available. No need for a starred version as
% anyhow the commented-out header was not put into the macro by the existing
% \csa{FCD@main} code. No need to reset the toggle as documentation explains
% direct usage of the environment begin and end macros must be inside a 
% |\begingroup\endgroup| pair.
%
% |v1.5| adds the ``starred''-named variants as aliases.
%    \begin{macrocode}
\begingroup
\catcode`\*=11
\gdef\filecontentsdef #1{\let\FCD@global\@empty
                         \@tempswatrue\FCD@get{\FCD@main{#1}}}%
\gdef\filecontentsdef*#1{\let\FCD@global\@empty
                         \@tempswafalse\FCD@get{\FCD@main{#1}}}%
\global\let\filecontentsdefstarred\filecontentsdef*
\gdef\filecontentsgdef #1{\@tempswatrue\FCD@get{\FCD@main{#1}}}%
\gdef\filecontentsgdef*#1{\@tempswafalse\FCD@get{\FCD@main{#1}}}%
\global\let\filecontentsgdefstarred\filecontentsgdef*
%    \end{macrocode}
% |v1.5| can not use original \csa{endfilecontents} which makes reference to
% \csa{reserved@c} whereas \fcdname now uses in its place \csa{FCD@reserved@c}.
% Finally I drop altogether the bulk of this macro which issued a warning in
% case of an encountered form feed or tabulation character.
%
% |v1.5| adds support for definitions with local scope so we must smuggle the
% defined macro out of the environment. This is done via \csa{FCD@defmacro}
% which is set-up via \csa{FCD@main}.
%    \begin{macrocode}
\gdef\endfilecontentsdef{\immediate\closeout\FCD@reserved@c\FCD@defmacro}%
\global\let\endfilecontentsdef*\endfilecontentsdef
\global\let\endfilecontentsdefstarred\endfilecontentsdef
\gdef\endfilecontentsgdef{\immediate\closeout\FCD@reserved@c}%
\global\let\endfilecontentsgdef*\endfilecontentsgdef
\global\let\endfilecontentsgdefstarred\endfilecontentsgdef
\gdef\filecontentsdefmacro{\let\FCD@global\@empty
                           \@fileswfalse\FCD@get{\FCD@main{}}}%
\gdef\endfilecontentsdefmacro{\FCD@defmacro}%
\gdef\filecontentsgdefmacro{\@fileswfalse\FCD@get{\FCD@main{}}}%
\global\let\endfilecontentsgdefmacro\relax
\gdef\filecontentshere #1{\let\FCD@global\@empty
                           \@tempswatrue\FCD@main{#1}\filecontentsheremacro}%
\gdef\filecontentshere*#1{\let\FCD@global\@empty
                           \@tempswafalse\FCD@main{#1}\filecontentsheremacro}%
\global\let\filecontentsherestarred\filecontentshere*
\gdef\endfilecontentshere{\endfilecontentsdef\aftergroup\FCD@here}%
\global\let\endfilecontentshere*\endfilecontentshere
\global\let\endfilecontentsherestarred\endfilecontentshere
%    \end{macrocode}
% Package |verbatim.sty| modifies the standard |verbatim| environment. For
% both the original and the modified version we need to insert an active |^^M|
% upfront, else an empty first line would not be obeyed. The |verbatim.sty|'s
% |verbatim| needs that we feed it with the macro expanded once, as it uses
% active end of lines as delimiters and they thus need to be immediately
% visible. It also needs an active |^^M| after the |\end{verbatim}|. To avoid
% to check at |\AtBeginDocument| if package |verbatim.sty| is loaded, we use a
% slightly tricky common definition. The advantage is that this may help make
% the code compatible with further packages (I have not looked for them)
% modifying the |verbatim| environment. For better code readibility I use
% |^^M%|'s rather than exploiting the active ends of lines here.
%
% |v1.5| adds \csa{FCDprintenvname} which holds the name of the environment to
% be used. Initially configured to hold of course |verbatim|. And it also adds
% \csa{FCDprintenvoptions}.
%    \begin{macrocode}
\gdef\filecontentsprint{\FCD@get\FCD@print}%
\catcode`\^^M\active%
\gdef\FCD@print #1{\let\FCD@print@EOL^^M\let^^M\relax%
   \begingroup\toks@\expandafter{#1}%
    \edef\x{\endgroup%
        \noexpand\begin{\FCDprintenvname}\FCDprintenvoptions^^M%
        \the\toks@\@backslashchar end\string{\FCDprintenvname\string}}%
   \x^^M%
   \FCD@print@resetEOL}%
\gdef\FCD@print@resetEOL{\let^^M\FCD@print@EOL}%
\gdef\filecontentsprintviascan{\FCD@get\FCD@printviascan}%
%    \end{macrocode}
% |v1.5| adds \csa{filecontentsprintviascan} which uses \csa{scantokens} to wrap
% stored contents in a verbatim-like environment. This is needed for things
% such as |listings| (it uses an active backslash at start of lines).
% Attention to the \csa{scantokens} subtlety with \csa{end} which would become
% |\end<space>| and then again |listings| would not recognize the ending
% pattern.
%    \begin{macrocode}
\gdef\FCD@printviascan#1{%
   \toks@\expandafter{#1}%
   \edef\FCD@envwithcontents{%
        \noexpand\begin{\FCDprintenvname}\FCDprintenvoptions\noexpand^^M%
        \the\toks@\@backslashchar end{\FCDprintenvname}\noexpand^^M}%
   \FCD@exec\FCD@envwithcontents}%
\endgroup
\def\FCDprintenvname{verbatim}%
\let\FCDprintenvoptions\@empty
\def\FCD@here{\FCD@print\filecontentsheremacro}%
\def\filecontentsexec{\FCD@get\FCD@exec}%
%    \end{macrocode}
% |v1.5| restores \csa{newlinechar} to its prior value, rather than setting it
% to the \LaTeX{} default (10).
%    \begin{macrocode}
\def\FCD@exec #1{\edef\FCD@newlinechar{\the\newlinechar}%
    \newlinechar13 
    \scantokens\expandafter{#1}\newlinechar\FCD@newlinechar\relax}%
\endinput
%    \end{macrocode}
% \MakePercentComment
\Finale
%%
%% End of file `filecontentsdef.dtx'.
