scontents (30jul19)

git-svn-id: svn://tug.org/texlive/trunk@51779 c570f23f-e606-0410-a88d-b1316a301751

9 files changed, 2123 insertions, 1 deletions

diff --git a/Master/texmf-dist/doc/latex/scontents/README.md b/Master/texmf-dist/doc/latex/scontents/README.md
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@@ -0,0 +1,26 @@
+# scontents — Store LaTeX content in Sequences (l3seq)
+- Version: 1.0
+- Date: 2019/07/30
+- Authors: Pablo González and Phelype Oleinik
+
+## Description
+The `scontents` package stores valid `LaTeX` code in sequences using the
+`l3seq` module of `expl3`. The stored content (including verbatim) can be
+used as many times as desired in the document, additionally can be written
+to external files if desired.
+
+## Requirements
+The package requires the following packages:
+- [filecontentsdef](https://ctan.org/pkg/filecontentsdef)
+- [l3keys2e](https://ctan.org/pkg/l3keys2e)
+- [xparse](https://ctan.org/pkg/xparse)
+
+## License
+The scontents package may be modified and distributed under the terms and
+conditions of the [LaTeX Project Public License](https://www.latex-project.org/lppl/), version 1.3c or greater.
+
+## Contents
+- README.md (this file)
+- scontents.sty (the sty)
+- scontents.pdf  (documentation)
+- scontents.dtx  (master file that produced all files)
diff --git a/Master/texmf-dist/doc/latex/scontents/scontents.pdf b/Master/texmf-dist/doc/latex/scontents/scontents.pdf
new file mode 100644
index 00000000000..240570a5e1d
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/scontents/scontents.pdf
diff --git a/Master/texmf-dist/source/latex/scontents/scontents.dtx b/Master/texmf-dist/source/latex/scontents/scontents.dtx
new file mode 100644
index 00000000000..c376fd9dc2c
--- /dev/null
+++ b/Master/texmf-dist/source/latex/scontents/scontents.dtx
@@ -0,0 +1,1798 @@
+% \iffalse meta-comment
+%<*internal>
+\iffalse
+%</internal>
+%<*readme>
+# scontents — Store LaTeX content in Sequences (l3seq)
+- Version: 1.0
+- Date: 2019/07/30
+- Authors: Pablo González and Phelype Oleinik
+
+## Description
+The `scontents` package stores valid `LaTeX` code in sequences using the
+`l3seq` module of `expl3`. The stored content (including verbatim) can be
+used as many times as desired in the document, additionally can be written
+to external files if desired.
+
+## Requirements
+The package requires the following packages:
+- [filecontentsdef](https://ctan.org/pkg/filecontentsdef)
+- [l3keys2e](https://ctan.org/pkg/l3keys2e)
+- [xparse](https://ctan.org/pkg/xparse)
+
+## License
+The scontents package may be modified and distributed under the terms and
+conditions of the [LaTeX Project Public License](https://www.latex-project.org/lppl/), version 1.3c or greater.
+
+## Contents
+- README.md (this file)
+- scontents.sty (the sty)
+- scontents.pdf  (documentation)
+- scontents.dtx  (master file that produced all files)
+%</readme>
+%<*internal>
+\fi
+\def\nameofplainTeX{plain}
+\ifx\fmtname\nameofplainTeX\else
+  \expandafter\begingroup
+\fi
+%</internal>
+%<*install>
+\input l3docstrip.tex
+\keepsilent
+\askforoverwritefalse
+\nopreamble\nopostamble
+\usedir{tex/latex/scontents}
+\generate{
+  \file{\jobname.sty}{\from{\jobname.dtx}{package}}
+}
+%</install>
+%<install>\endbatchfile
+%<*internal>
+\usedir{source/latex/scontents}
+\generate{
+  \file{\jobname.ins}{\from{\jobname.dtx}{install}}
+}
+\nopreamble\nopostamble
+\usedir{doc/latex/scontents}
+\generate{
+  \file{README.md}{\from{\jobname.dtx}{readme}}
+}
+\ifx\fmtname\nameofplainTeX
+  \expandafter\endbatchfile
+\else
+  \expandafter\endgroup
+\fi
+%</internal>
+%<*driver>
+\documentclass[full]{l3doc}
+\usepackage[top=0.5in,bottom=0.5in,left=2.0in,right=1in,footskip=0.2in,headsep=10pt]{geometry}
+\usepackage{unicode-math}
+\setmathfont[Scale = 0.95]{Latin Modern Math}
+\setmainfont[
+   Numbers           = OldStyle,
+   Ligatures         = TeX,
+   Scale               = 0.95,
+   UprightFont       = *-Regular,
+   ItalicFont        = *-Italic,
+   BoldFont          = *-Bold,
+   BoldItalicFont    = *-BoldItalic,
+   SmallCapsFeatures = {Letters=SmallCaps},
+   Extension =.otf]{LibertinusSerif}
+\setsansfont[
+   Numbers           = OldStyle,
+   Ligatures         = TeX,
+   Scale             = 0.95,
+   UprightFont       = *-Regular,
+   ItalicFont        = *-Italic,
+   BoldFont          = *-Bold,
+   SmallCapsFeatures = {Letters=SmallCaps},
+   Extension = .otf]{LibertinusSans}
+\setmonofont[
+   Scale             = 0.80,
+   Extension         = .otf,
+   UprightFont       = *-Regular ,
+   ItalicFont        = *-RegularIt,
+   BoldFont          = *-Medium ,
+   BoldItalicFont    = *-MediumIt
+            ]{SourceCodePro}
+\newfontfamily\lmmitalic{lmmono10-italic.otf}[
+   Scale             = 0.95,%
+   Extension         = .otf,%
+   ItalicFont        = lmmono10-italic,%
+   SmallCapsFont     = lmmonocaps10-oblique,%
+   SlantedFont       = lmmonoslant10-regular,
+   ]
+\newfontfamily\fetamontotf{ffmw10.otf}[
+   Scale             = 0.95,%
+   RawFeature        = {+latn,+rand,+kern,+size},%
+   ]
+\usepackage[svgnames]{xcolor}
+\usepackage{fontawesome5}
+\usepackage[sf,bf,compact,medium,pagestyles]{titlesec}
+\usepackage{hyperxmp,lastpage,imakeidx,microtype,attachfile2}
+\usepackage{adjustbox,multicol,listings,accsupp,titletoc}
+\usepackage{scontents} % main
+
+\usepackage[contents]{colordoc}
+
+% Patching colordoc.sty to work with l3doc.cls
+\ExplSyntaxOn
+\cs_new_eq:cN { liii@xmacro@code } \__codedoc_xmacro_code:n
+\ExplSyntaxOff
+\begingroup
+\makeatletter
+\catcode`\[\@ne\catcode`\]\tw@
+\@makebracesactive
+\gdef{[\@openingbrace[\char'173]]
+\gdef}[\@closingbrace[\char'175]]
+\catcode`\|\z@\catcode`\%12
+\catcode`\ \active\catcode`\\\active
+|gdef|xmacro@code#1%    \end{macrocode}[|liii@xmacro@code[#1]|end[macrocode]]
+|catcode`| 12|gdef|sxmacro@code#1%    \end{macrocode*}[|liii@xmacro@code[#1]|end[macrocode*]]
+|endgroup
+
+\EnableCrossrefs
+\PageIndex
+\CodelineIndex
+\DoNotIndex{\ , \1,\^}
+\expandafter\DoNotIndex\expandafter{\string\{}
+\expandafter\DoNotIndex\expandafter{\string\}}
+\expandafter\DoNotIndex\expandafter{\string\begin}
+\newcommand{\HP}[1]{\emph{\hyperpage{#1}}\normalsize}
+\def\MYSortIndex#1#2{\index[mydoc]{#1\actualchar#2|HP}}
+
+\indexsetup{level=\section,firstpagestyle=myheader}
+\makeindex[name=mydoc,options=-s gind.ist,columnsep=15pt,title={Index of Documentation}]
+\makeindex[options=-s gind.ist,columnsep=15pt,title={Index of Implementation}]
+\setlength{\parindent}{0pt}
+
+%%-------------------- ONLY FOR DOCUMENTATION ------------------------%%
+% Colors for options
+\definecolor{optcolor}{rgb}{0.281,0.275,0.485}
+\definecolor{mypkgcolor}{RGB}{0,128,128}%
+% Custom \mymeta[...]{...}, \mymarg[...]{...} and \myoarg[...]{...} for color
+\ExplSyntaxOn
+%^^A user level commands
+\NewDocumentCommand{\mymeta}{O{}m}
+  {
+   \mydoc_mymeta_generic:Nnn \mydoc_mymeta:n { #1 } { #2 }
+  }
+\NewDocumentCommand{\mymarg}{O{}m}
+  {
+   \mydoc_mymeta_generic:Nnn \mydoc_mymarg:n { #1 } { #2 }
+  }
+\NewDocumentCommand{\myoarg}{O{}m}
+  {
+   \mydoc_mymeta_generic:Nnn \mydoc_myoarg:n { #1 } { #2 }
+  }
+%^^A variables and keys
+\tl_new:N \l_mydoc_mymeta_font_tl
+
+\keys_define:nn { mydoc / mymeta }
+  {
+   type .choice:,
+   type / tt .code:n = \tl_set:Nn \l_mydoc_mymeta_font_tl { \ttfamily },
+   type / rm .code:n = \tl_set:Nn \l_mydoc_mymeta_font_tl { \rmfamily },
+   type .initial:n = tt,
+   cf .tl_set:N = \l_mydoc_mymeta_color_tl,
+   cf .initial:n = black,
+   ac .tl_set:N = \l_mydoc_mymeta_anglecolor_tl,
+   ac .initial:n = black,
+   sbc .tl_set:N = \l_mydoc_mymeta_brackcolor_tl,
+   sbc .initial:n = black,
+   cbc .tl_set:N = \l_mydoc_mymeta_bracecolor_tl,
+   cbc .initial:n = black,
+  }
+%^^A internal commands
+\cs_new_protected:Npn \mydoc_mymeta_generic:Nnn #1 #2 #3
+  {
+   \group_begin:
+   \keys_set:nn { mydoc / mymeta } { #2 }
+   \color{ \l_mydoc_mymeta_color_tl }
+   \l_mydoc_mymeta_font_tl
+   #1 { #3 } % #1 is \mydoc_mymeta:n, \mydoc_mymarg:n or \mydoc_myoarg:n
+   \group_end:
+  }
+\cs_new_protected:Npn \mydoc_mymeta:n #1
+  {
+   \mydoc_mymeta_angle:n { \textlangle }
+   \mydoc_mymeta_mymeta:n { #1 }
+   \mydoc_mymeta_angle:n { \textrangle }
+  }
+\cs_new_protected:Npn \mydoc_mymarg:n #1
+  {
+   \mydoc_mymeta_brace:n { \textbraceleft }
+   \mydoc_mymeta:n { #1 }
+   \mydoc_mymeta_brace:n { \textbraceright }
+  }
+\cs_new_protected:Npn \mydoc_myoarg:n #1
+  {
+   \mydoc_mymeta_brack:n { [ }
+   \mydoc_mymeta:n { #1 }
+   \mydoc_mymeta_brack:n { ] }
+  }
+\cs_new_protected:Npn \mydoc_mymeta_mymeta:n #1
+  {
+   \textnormal{\textit{#1}}
+  }
+\cs_new_protected:Npn \mydoc_mymeta_angle:n #1
+  {
+   \group_begin:
+   \fontfamily{lmr}\selectfont
+   \textcolor{\l_mydoc_mymeta_anglecolor_tl}{#1}
+   \group_end:
+  }
+\cs_new_protected:Npn \mydoc_mymeta_brace:n #1
+  {
+   \group_begin:
+   \color{\l_mydoc_mymeta_bracecolor_tl}
+    #1
+   \group_end:
+  }
+\cs_new_protected:Npn \mydoc_mymeta_brack:n #1
+  {
+   \textcolor{\l_mydoc_mymeta_brackcolor_tl}{#1}
+  }
+
+% \envexamp{m}
+\newsavebox{\marginexa}
+\NewDocumentCommand{\envexamp}{m}
+  {
+   \begin{lrbox}{\marginexa}%
+    \begin{minipage}[t]{\marginparwidth}%
+     \raggedleft\ttfamily\small
+     \textcolor{gray}{\textbackslash begin\{\textcolor{mypkgcolor}{\bfseries{#1}}\}\myoarg
+     [type=tt,sbc=gray,ac=NavyBlue,cf=optcolor]{key=val}}\par%
+     \mymeta[ac=gray,cf=gray]{env ~ contents}\par%
+     \textcolor{gray}{\textbackslash end\{{\textcolor{mypkgcolor}{\bfseries{#1}}}\}}\par
+    \end{minipage}%
+   \end{lrbox}%
+   \leavevmode%
+   \marginpar{\usebox{\marginexa}}%
+   \ignorespaces%
+  }
+
+% \cmdexamp{s m o m o}
+\DeclareDocumentCommand{\cmdexamp}{s m o m o}
+  {
+  \group_begin:
+  \small\ttfamily
+  \adjustbox{outer=-0.5\marginparsep}{\textcolor{mypkgcolor}{\textbackslash#2}}
+  \IfBooleanTF{#1}{ \textcolor{red}{*} }{ \hphantom{*} }
+  \IfValueT{#3}{ \myoarg[type=tt,sbc=gray,ac=NavyBlue,cf=optcolor]{#3} }
+  \IfValueTF{#5}
+    {
+     \mymeta[ac=OrangeRed,type=tt,cf=MediumOrchid]{#5}%
+     \mymeta[type=tt,cbc=OrangeRed,ac=NavyBlue,cf=MediumOrchid]{#4}
+     \mymeta[ac=OrangeRed,type=tt,cf=MediumOrchid]{#5}%
+    }
+    { \mymarg[type=tt,cbc=OrangeRed,ac=NavyBlue,cf=MediumOrchid]{#4} }
+  \par
+  \group_end:
+  \MYSortIndex{Commands}{Commands ~ provide  ~ by  ~ \textcolor{gray}{scontents}>\texttt{\textbackslash#2}}%
+  }
+
+% \keyexamp{mmm}
+\DeclareDocumentCommand{\keyexamp}{ m m m }
+  {
+  \par
+  \adjustbox{outer=-\marginparsep}{\textcolor{mypkgcolor}{\small\ttfamily{#1}}}
+  \textcolor{gray}{\,\bfseries\texttt{=}}\,{}
+  \mymarg[type=tt,cbc=OrangeRed,ac=NavyBlue,cf=MediumOrchid]{\small{#2}}
+  \hfill\textcolor{gray}{\small\textsf{(default:  ~ \texttt{#3})}}
+  \par
+  \MYSortIndex{Keys}{Keys>\texttt{#1}}%
+  }
+
+% \mypkg{sm}
+\NewDocumentCommand{\mypkg}{sm}
+  {
+   \IfBooleanTF{#1}
+    {
+     \normalsize{\sffamily\textcolor{mypkgcolor}{s}\textcolor{OrangeRed}{content}\textcolor{mypkgcolor}{s}}
+     \MYSortIndex{packages}{Packages>\texttt{#2}}
+    }
+    {
+     \textcolor{gray}{\textsf{#2}}
+     \MYSortIndex{packages}{Packages>\texttt{#2}}%
+    }
+  }
+
+% \myenv{sm}
+\DeclareDocumentCommand{\myenv}{sm}
+  {
+   \IfBooleanTF{#1}
+    {
+     \textcolor{mypkgcolor}{\ttfamily{#2}}%
+     \MYSortIndex{environment}{Environment ~ provide ~ by ~ \textcolor{gray}{scontents}:>\texttt{#2}}
+    }
+    {
+     \textcolor{gray}{\ttfamily{#2}}%
+     \MYSortIndex{environment}{Environments>\texttt{#2}}
+    }
+  }
+
+% \ics{sm}
+\DeclareDocumentCommand{\ics}{sm}
+  {
+    \IfBooleanTF{#1}
+      {
+        \textcolor{mypkgcolor}{\ttfamily\textbackslash{#2}}
+        \MYSortIndex{Commands}{Commands ~ provide  ~ by  ~ \textcolor{gray}{scontents}>\texttt{\textbackslash#2}}
+      }
+      {
+        \textcolor{gray}{\ttfamily\textbackslash{#2}}
+        \MYSortIndex{#2}{\texttt{\textbackslash#2}}
+      }
+  }
+\ExplSyntaxOff
+
+% email https://tex.stackexchange.com/a/663
+\catcode`\_=11\relax%
+\newcommand\email[1]{\_email #1\q_nil}%
+\def\_email#1@#2\q_nil{%
+  \href{mailto:#1@#2}{{\emailfont #1\emailampersat #2}}%
+}%
+\newcommand\emailfont{\sffamily}%
+\newcommand\emailampersat{{\color{optcolor}\footnotesize @}}%
+\catcode`\_=8\relax%
+
+\makeatletter
+% Logo whit textffmw font for title
+\newsavebox{\logobox}
+\savebox{\logobox}{%
+  \normalsize\fetamontotf{\textcolor{mypkgcolor}{s}\textcolor{OrangeRed}{content}\textcolor{mypkgcolor}{s}}}
+\newcommand{\mylogo}{%
+  \settoheight{\@tempdima}{L}%
+  \resizebox{!}{\@tempdima}{\usebox{\logobox}}%
+ }
+\makeatother
+
+% don't copy numbers in code example
+\newcommand*{\noaccsupp}[1]{\BeginAccSupp{ActualText={}}#1\EndAccSupp{}}
+
+% Create a language for documentation
+\lstdefinelanguage{scontents-doc}{
+    texcsstyle=*,%
+    escapechar=`,%
+    showstringspaces=false,%
+    extendedchars=true, %
+    stringstyle = {\color{red}},%
+    basicstyle=\ttfamily\small,%
+% comments
+    morecomment=[l]{\%},%
+    commentstyle=\lmmitalic\small\itshape\color{lightgray},%
+% Important words 1
+    keywordstyle=[1]{\bfseries\color{NavyBlue}},%
+    keywords=[1]{begin,end,documentclass},%
+% Other words 2
+    keywordstyle=[2]{\color{blue!75}},%
+    keywords=[2]{usepackage,section},%
+% Other words 3
+    keywordstyle=[3]{\color{optcolor!85}},%
+    keywords=[3]{document,article},%
+% Reserved words 4(inputfile options)
+    keywordstyle=[4]{\bfseries\color{mypkgcolor}},%
+    keywords=[4]{scontents,Scontents,getstored,typestored,verbatimsc,endverbatimsc,countsc},%
+% Reserved in orange
+    keywordstyle=[5]{\color{OrangeRed}},%
+    keywords=[5]{makeatletter,makeatother,foreach,DefineVerbatimEnvironment,lstnewenvironment,newminted},%
+% Reserved in orange
+    keywordstyle=[6]{\color{red}},%
+    keywords=[6]{verb,myverb,store-cmd,store-env},%
+% literateee
+    literate=*{\{}{{\bfseries\textcolor{gray}{\{}}}{1}
+              {\}}{{\bfseries\textcolor{gray}{\}}}}{1}
+              {[}{{\bfseries\textcolor{optcolor}{[}}}{1}
+              {]}{{\bfseries\textcolor{optcolor}{]}}}{1}
+              {,}{{\textcolor{gray}{,}}}{1}
+              {\$}{{\textcolor{blue}{\$}}}{1}
+              {*}{{\bfseries\textcolor{red}{*}}}{1}
+              {@}{{\textcolor{red}{@}}}{1}
+              {=}{{\textcolor{red}{=}}}{1},%
+}[keywords,tex,comments,strings]% end languaje
+
+% \begin{examplecode}[optlst]...\end{examplecode}
+\lstnewenvironment{examplecode}[1][]{%
+\lstset{
+    language=scontents-doc,%
+    stringstyle = {\color{red}},%
+    basicstyle=\ttfamily\small,%
+    numbersep=1em,%
+    numberstyle=\tiny\color{lightgray}\noaccsupp,%
+    rulecolor=\color{gray!50},%
+    framesep=\fboxsep,%
+    framerule=\fboxrule,%
+    xleftmargin=\dimexpr\fboxsep+\fboxrule\relax,%
+    xrightmargin=\dimexpr\fboxsep+\fboxrule\relax,%
+           #1,%
+    }% close lstset
+}{}% close examplecode
+
+% \lstinline[style=inline]|...|
+\lstdefinestyle{inline}
+  {
+   language=scontents-doc,%
+   numbersep=1em,%
+   numberstyle=\tiny\color{lightgray}\noaccsupp,%
+   basicstyle=\ttfamily\small\color{gray},%
+   escapechar=`,%
+   upquote=true,%
+   literate=*{\%}{{\bfseries\textcolor{gray}{\%}}}{1}
+  }
+
+% set default style
+\lstset{style=inline}
+
+% Get file info
+\GetFileInfo{\jobname.sty}
+
+% Config hyperref
+\hypersetup{
+   linkcolor          = blue!50,
+   citecolor          = red!50,%
+   urlcolor           = magenta,%
+   colorlinks         = true,%
+   linktoc            = all,%
+   pdftitle           = {.:: The scontents package --- \fileinfo{} ::.},%
+   pdfauthor          = {Pablo González L and Phelype Oleinik},
+   pdfsubject         = {Documentation for \fileversion{} [\filedate] },%
+   pdfcopyright       = {\textcopyright 2019 by Pablo González and Phelype Oleinik},
+   pdfcontacturl      = {https://github.com/pablgonz/scontents},
+   pdfkeywords        = {filecontents, filecontentsdef, xparse, expl3, l3seq, Store contents},
+   pdfstartview       = {FitH},%
+   bookmarksopenlevel = 2,%
+  }
+
+% Configuration titleps
+\settitlemarks{section}
+\renewpagestyle{plain}[\color{gray}\small\sffamily]{
+\setfoot{}{}{\thepage/\pageref{LastPage}}}
+
+\newpagestyle{myheader}[\color{gray}\small\sffamily]{
+\renewcommand\makeheadrule{\color{gray}\rule[0.45\baselineskip]{\linewidth}{0.4pt}}
+\setfoot{\scalebox{0.8}{\mylogo}\space\textcopyright\space 2019 by Pablo González and  Phelype Oleinik}
+        {}
+        {\thepage/\pageref{LastPage}}
+\sethead{\raisebox{0.75\baselineskip}{Documentation for \fileversion\space[\filedate]}}
+        {}
+        {\raisebox{0.75\baselineskip}{\scshape\small\S.\thesection\space\sectiontitle}}
+}
+
+% add headheight
+\setlength{\headheight}{21pt}%
+
+% Table of contents
+\titlecontents{section}[0mm]{}%
+    {\bfseries\contentspush{\makebox[4mm][l]{\thecontentslabel\hfill}}}%
+    {\hspace*{-4mm}}% numberless
+    {\hspace{0.25em}\titlerule*[6pt]{.}\contentspage}%
+\titlecontents{subsection}[4mm]{}%
+    {\contentspush{\makebox[6mm][l]{\thecontentslabel\hfill}}}
+    {\hspace*{-10mm}}% numberless
+    {\hspace{0.25em}\titlerule*[6pt]{.}\contentspage}%
+\titlecontents{subsubsection}[10mm]{}%
+    {\contentspush{\makebox[8mm][l]{\thecontentslabel\hfill}}}
+    {\hspace*{-18mm}}% numberless
+    {\hspace{0.25em}\titlerule*[6pt]{.}\contentspage}%
+
+% Table of contents
+\makeatletter
+\renewcommand\tableofcontents{%
+\begingroup%
+\section*{\contentsname\quad{\color{gray}\leaders\hrule height 5pt depth -4.4pt\hfill}%
+  \@mkboth{%
+    \MakeUppercase\contentsname}{\MakeUppercase\contentsname}}%
+\vspace*{-14pt}
+\setlength{\columnsep}{10pt}%
+ \begin{multicols}{2}%
+    \@starttoc{toc}%
+\end{multicols}%
+\vspace*{-3pt}{\color{gray}\hrule height 0.6pt}%
+\vspace*{5pt}
+\endgroup
+}
+\makeatother
+
+\begingroup\expandafter\expandafter\expandafter\endgroup
+\expandafter\ifx\csname pdfxform\endcsname\relax
+  \usepackage{luatex85} % For LuaTeX
+\fi
+
+\begin{document}
+  \DocInput{\jobname.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+% \title{
+%    \scalebox{1.1}{\mylogo}\\[2pt]
+%    \large
+%    \textsf{Store \hologo{LaTeX} contents in seq}\\[3pt]
+%    \Large
+%    \fileversion{} --- \filedate\thanks{
+%    This file describes a documentation for \fileversion, last revised
+%    \filedate.}\\[25pt]
+%    \author{
+%    \large
+%    \raisebox{-1pt}{\textcopyright}{}2019 by Pablo González and Phelype Oleinik
+%    \thanks{E-mail: \textsf{\guillemotleft}\email{pablgonz@educarchile.cl}\textsf{\guillemotright}}%
+%    }
+% \small
+% \textsc{ctan}: \url{http://www.ctan.org/pkg/scontents}\\
+% \textsc{git}: \url{https://github.com/pablgonz/scontents}
+% \vspace*{-2cm}
+% }
+% \date{}
+% \maketitle
+%
+% \begin{abstract}
+% The \mypkg*{scontents} package stores valid \hologo{LaTeX} code in sequences using
+% the \mypkg{l3seq} module of \mypkg{expl3}. The stored content (including
+% \emph{verbatim}) can be used as many times as desired in the document,
+% additionally can be written to external files if desired.
+% \end{abstract}
+%
+% \tableofcontents
+%
+% \setlength{\parskip}{3pt}
+%
+% \section[Description]{Description}
+%
+% The \mypkg*{scontents} package encapsulates the \mypkg{filecontentsdef}
+% package of \textsc{Jean Fran\c{c}ois Burnol} which allows you to save the
+% content in a |\macro| and save it in external files, adding a user interface
+% style \myoarg{key = val} along with the ability to save content in sequences
+% for later use in different parts of the document.
+%
+% \section{Motivation and Acknowledgments}
+%
+% In \hologo{LaTeX} there is no direct way to record content for later use, although
+% you can do this using \verb|\macros|, recording \meta{verbatim content}  is a
+% problem, usually you can avoid this by creating external files or boxes. The
+% general idea of this package is to try to imitate this implementation
+% \emph{buffers} that has \hologo{ConTeXt} which allows you to save content in
+% memory, including \emph{verbatim}, to be used later. The package
+% \mypkg{filecontentsdef} solves this problem and since \mypkg{expl3} has an
+% excellent way to manage data, I decided to combine the best of both.
+%
+% This package would not be possible without the great work of \textsc{Jean
+% Fran\c{c}ois Burnol} who was kind enough to take my requirements into account
+% and add the \myenv{filecontentsdefmacro} environment. Also a special thanks to
+% all the \hologo{LaTeX3} team for their great work and to the different members
+% of the \href{https://tex.stackexchange.com}{TeX-SX} community who have provided
+% great answers and ideas. Here a note of the main ones:
+%
+% \begin{enumerate}[nosep]
+% \item \href{https://tex.stackexchange.com/q/45946/7832}{Stack datastructure using LaTeX}
+%
+% \item \href{https://tex.stackexchange.com/q/5338/7832}{LaTeX equivalent of ConTeXt buffers}
+%
+% \item \href{https://tex.stackexchange.com/q/215563/7832}{Storing an array of strings in a command}
+%
+% \item \href{https://tex.stackexchange.com/q/184503/7832}{Collecting contents of environment and store them for later retrieval}
+%
+% \item \href{https://tex.stackexchange.com/q/373647/7832}{Collect contents of an environment (that contains verbatim content)}
+% \end{enumerate}
+%
+% \section[License and Requirements]{License and Requirements}
+% \label{sec:Licenseandreq}
+%
+% Permission is granted to copy, distribute and/or modify this software under
+% the terms of the LaTeX Project Public License (lppl), version 1.3 or later
+% (\url{http://www.latex-project.org/lppl.txt}). The software has the status
+% \enquote{maintained}.
+%
+% The \mypkg*{scontents} package loads \mypkg{xparse},
+% \mypkg{filecontentsdef} and \mypkg{l3keys2e}. This package can be used
+% with |xelatex|, |lualatex|, |pdflatex| and the classical workflow
+% |latex|-|dvips|-|ps2pdf|.
+%
+% \thispagestyle{plain}
+%
+% \newpage
+%
+% \pagestyle{myheader}
+%
+% \section{The scontents package}
+%
+% The \mypkg*{scontents} package provides the \myenv*{scontents} environment,
+% \ics*{Scontents} and \ics*{Scontents*} command to stored contents and \ics*{getstored}
+% command to get the \meta{stored content} along with other utilities described in this
+% documentation.
+%
+% \subsection{Loading package}
+% \label{sec:loadoptpkg}
+%
+% The package is loaded in the usual way:
+% \iffalse
+%<*example>
+% \fi
+\begin{examplecode}[frame=single]
+\usepackage{scontents}
+\end{examplecode}
+% \iffalse
+%</example>
+% \fi
+% Or
+% \iffalse
+%<*example>
+% \fi
+\begin{examplecode}[frame=single]
+\usepackage`\myoarg[type=tt,cbc=OrangeRed,ac=NavyBlue,cf=optcolor]{key=val}`{scontents}
+\end{examplecode}
+% \iffalse
+%</example>
+% \fi
+% \subsection{Configuration of the options}
+% \label{sec:confopt}
+%
+% Most of the options can be passed directly to the package or can be
+% configured by means of the command \ics*{setupsc}.
+%
+% \cmdexamp{setupsc}{key=val}
+% The command \ics*{setupsc} configures the options in a global way,
+% it can be used both in the preamble and in the body of the document
+% as many times as desired.
+%
+% The summary with all possible options can be found in \ref{sec:optover}.
+%
+% \section{User interface}
+% \label{sec:userinterface}
+%
+% The user interface provided by the package provides an environment and several
+% commands with some limitations that must be taken into account.
+%
+% \subsection{The environment scontents}
+% \label{sec:envscontents}
+%
+% \envexamp{scontents}
+% The \myenv*{scontents} environment encapsulates the \ics{filecontentsdef*} and %
+% \ics{filecontentsdefmacro} environments provided by the \mypkg{filecontentsdef}
+% package. This allows you to record content including verbatim for later
+% reuse. Some considerations to keep in mind:
+%
+% \begin{enumerate}[nosep]
+% \item The environment cannot be nested.
+% \item Both \lstinline[style=inline]|\begin| and \lstinline[style=inline]|\end|
+%  must be on different lines.
+% \item The \myoarg{key=val} options must be passed on one line right after
+%  starting the environment.
+% \item The content of the environment is treated in the same way as
+% \myenv{filecontents*} environment.
+% \item If you don't want the extra space added by \hologo{TeX}, you should use
+% \ics{relax} or \lstinline[style=inline]|%| at the end of environment.
+% \end{enumerate}
+%
+% For more technical information about the environment it is better to read
+% the documentation of the \mypkg{filecontentsdef} package.
+%
+% \subsubsection*{Options for environment}
+%
+% The environment options can be configured globally using option
+% in package or the \ics*{setupsc} command and locally
+% using \myoarg{key=val} in the environment.
+%
+% \medskip
+%
+% \keyexamp{store-env}{seq name}{contents}
+% The name of the sequence in which the content recorded by the environment
+% was stored.
+%
+% \medskip
+%
+% \keyexamp{print-env}{true\textbar false}{false}
+% It will show the current content of the environment.
+%
+% \medskip
+%
+% \keyexamp{write-env}{file.ext}{not used}
+% In addition to storing the content of the environment will write this in
+% an external file.
+%
+% \medskip
+%
+% \keyexamp{write-out}{file.ext}{not used}
+% It will write the contents of the environment in an external file, but,
+% it will not store the contents of this one. It is analogous to the
+% \myenv{filecontents*} environment.
+%
+% \subsection{The command \cs{Scontents}}
+% \label{sec:Scontents}
+%
+% \cmdexamp{Scontents}[key=val]{argument}
+% The \ics*{Scontents} command reads the \meta{argument} in standard mode.
+% It is not possible to pass environments such as \meta{verbatim}, but it is
+% possible to use the implementation of \ics{Verb} provided by the
+% \mypkg{fvextra} package for contents on one line and \ics{lstinline} from
+% \mypkg{listings} package, but it is preferable to use the starred version.
+%
+% It can be used anywhere in the document and cannot be used as an \meta{argument}
+% for another command.
+%
+% \cmdexamp*{Scontents}[key=val]{argument}
+% \cmdexamp*{Scontents}[key=val]{argument}[del]
+% The \ics*{Scontents*} command reads the \meta{argument} under  verbatim
+% category code regimen. If its first delimiter is a brace, it will be assumed that
+% the \meta{argument} is nested into braces. Otherwise it will be assumed that
+% the ending of that argument is delimited by that first delimiter-like the
+% argument of \ics{verb}. Some considerations to keep in mind:
+%
+% \begin{enumerate}[nosep]
+% \item Blank lines are preserved.
+% \item The command cannot be used as an argument for another command.
+% \item If you don't want the extra space added by \hologo{TeX}, you should use
+% \ics{relax} or \lstinline[style=inline]|%| at the end.
+% \end{enumerate}
+%
+% \subsubsection*{Options for command}
+%
+% The command options (including star version) can be configured globally
+% using option in package or the \ics*{setupsc} command and locally
+% using \myoarg{key=val}.
+% \medskip
+%
+% \keyexamp{store-cmd}{seq name}{contents}
+% The name of the sequence in which the content recorded by \ics*{Scontents}
+% was stored.
+%
+% \medskip
+%
+% \keyexamp{print-cmd}{true\textbar false}{false}
+% It will show the current content of \ics*{Scontents}.
+%
+% \subsection{The command \cs{getstored}}
+% \label{sec:getstored}
+%
+% \cmdexamp{getstored}[index]{seq name}
+% The command \ics*{getstored} gets the content stored in \meta{seq name}
+% according to the index in which it was stored. The command is robust and expandable
+% and can be used as an \meta{argument} for another command. If the optional argument
+% is not passed it defaults to the last element saved in the \meta{seq name}.
+%
+% \subsection{The command \cs{typestored}}
+% \label{sec:typestored}
+%
+% \cmdexamp{typestored}[index]{seq name}
+% The command \ics*{typestored} shows the content stored in \meta{seq name} in
+% \emph{verbatim} mode. Internally places the content into the \myenv*{verbatimsc} environment.
+%
+% \cmdexamp*{typestored}[index]{seq name}
+% The command \ics*{typestored*} must be used for content stored by \ics*{Scontents*} command.
+% Internally places the content into the \myenv*{verbatimsc} environment.
+%
+% If the optional argument is not passed it defaults to the
+% last element saved in the \meta{seq name}.
+%
+% One consideration to keep in mind is that this is a \emph{representation} of the content
+% in a \meta{verbatim} environment and not a real \meta{verbatim} environment, the line ends
+% are not respected. The \myenv*{verbatimsc} environment can be in the following ways:
+%
+% Using the package \mypkg{fancyvrb}:
+% \iffalse
+%<*example>
+% \fi
+\begin{examplecode}[frame=single]
+\makeatletter
+\let\verbatimsc\@undefined
+\let\endverbatimsc\@undefined
+\makeatother
+\DefineVerbatimEnvironment{verbatimsc}{Verbatim}{numbers=left}
+\end{examplecode}
+% \iffalse
+%</example>
+% \fi
+% Using the package \mypkg{minted}:
+% \iffalse
+%<*example>
+% \fi
+\begin{examplecode}[frame=single]
+\makeatletter
+\let\verbatimsc\@undefined
+\let\endverbatimsc\@undefined
+\makeatother
+\usepackage{minted}
+\newminted{tex}{linenos}
+\newenvironment{verbatimsc}{\VerbatimEnvironment\begin{texcode}}{\end{texcode}}
+\end{examplecode}
+% \iffalse
+%</example>
+% \fi
+% Using the package \mypkg{listings}:
+% \iffalse
+%<*example>
+% \fi
+\begin{examplecode}[frame=single]
+\makeatletter
+\let\verbatimsc\@undefined
+\let\endverbatimsc\@undefined
+\makeatother
+\usepackage{listings}
+\lstnewenvironment{verbatimsc}
+  {
+   \lstset{
+           basicstyle=\small\ttfamily,
+           columns=fullflexible,
+           language=[LaTeX]TeX,
+           numbers=left,
+           numberstyle=\tiny\color{gray},
+           keywordstyle=\color{red}
+          }
+  }{}
+\end{examplecode}
+% \iffalse
+%</example>
+% \fi
+%
+% \subsection{Other commands provided}
+%
+% \subsubsection*{The command \cs{meaningsc}}
+% \label{sec:meaningsc}
+%
+% \cmdexamp{meaningsc}[index]{seq name}
+% The command \ics*{meaningsc} executes \ics{meaning} on the content stored
+% in \meta{seq name}. If the optional argument is not passed it defaults to the
+% last element saved in the \meta{seq name}.
+%
+% \subsubsection*{The command \cs{countsc}}
+% \label{sec:countsc}
+%
+% \cmdexamp{countsc}{seq name}
+% The command \ics*{countsc} count a number of contents stored in \meta{seq name}.
+%
+% \subsubsection*{The command \cs{cleansc}}
+% \label{sec:cleansc}
+%
+% \cmdexamp{cleansc}{seq name}
+% The command \ics*{cleansc} remove all contents stored in \meta{seq name}.
+%
+% \subsection{Options Overview}
+% \label{sec:optover}
+%
+% \newcommand*{\xmark}{\textcolor{red}{✘}}%
+% \newcommand*{\cmark}{\textcolor{green}{✔}}%
+%
+% Summary table of available options
+%
+%
+% \begin{tabular}{cccccc}
+% \toprule
+%  \texttt{key}       & package & \ics{setupsc} & \myenv*{scontents}  & \ics*{Scontents} & \ics*{Scontents*}\\
+% \midrule
+%  \texttt{store-env} & \cmark  & \cmark        &  \cmark             & \xmark          & \xmark          \\
+%  \texttt{store-cmd} & \cmark  & \cmark        &  \xmark             & \cmark          & \cmark          \\
+%  \texttt{print-env} & \cmark  & \cmark        &  \cmark             & \xmark          & \xmark          \\
+%  \texttt{print-cmd} & \cmark  & \cmark        &  \xmark             & \cmark          & \cmark          \\
+%  \texttt{print-all} & \cmark  & \cmark        &  \cmark             & \xmark          & \xmark          \\
+%  \texttt{write-env} & \xmark  & \xmark        &  \cmark             & \xmark          & \xmark          \\
+%  \texttt{write-out} & \xmark  & \xmark        &  \cmark             & \xmark          & \xmark          \\
+% \bottomrule
+% \end{tabular}
+%
+% \section{Examples}
+% These are some (adapted) examples that have served as inspiration for
+% the creation of this package.
+%
+% \subsection{From answers package}
+%
+% \subsubsection*{Example 1}
+%
+% \begin{VerbatimOut}{scexamp1.ltx}
+% \documentclass[12pt,a4paper]{article}
+% \usepackage[store-cmd=solutions]{scontents}
+% \usepackage{pgffor}
+% \newtheorem{ex}{Exercise}
+% \begin{document}
+% \section{Problems}
+% \begin{ex}
+%   First exercise
+%    \Scontents{
+%       First solution.
+%    }
+% \end{ex}
+% \begin{ex}
+%   Second exercise
+%   \Scontents{
+%      Second solution.
+%   }
+% \end{ex}
+% \section{Solutions}
+% \foreach \i in {1,...,\countsc{solutions}} {
+% \noindent\textbf{\i} \getstored[\i]{solutions}\par
+% }
+% \end{document}
+% \end{VerbatimOut}
+%
+% Adaptation of example 1 (ansexam1) of the package \mypkg{answers}
+% \textattachfile[color=0 0 1]{scexamp1.ltx}{\faFile*[regular]}.
+% \lstinputlisting[language=scontents-doc,numbers=left]{scexamp1.ltx}
+%
+% \subsection{From filecontentsdef package}
+%
+% \subsubsection*{Example 2}
+%
+% \begin{VerbatimOut}{scexamp2.ltx}
+% \documentclass{article}
+% \usepackage[store-env=defexercise,store-cmd=defexercise]{scontents}
+% \usepackage{pgffor}
+% \pagestyle{empty}
+% \begin{document}
+% \Scontents{
+% Prove that \[x^n+y^n=z^n\] is not solvable in positive integers if $n$ is at
+% most $-3$.\par
+% }
+% \Scontents*{Refute the existence of black holes in less than $140$ characters.\relax}
+% \begin{scontents}[write-env=\jobname-3.txt]
+% \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{scontents}
+%
+% \foreach \i in {1,...,3} {
+% \begin{itemize}
+% \item \getstored[\i]{defexercise}
+% \end{itemize}}
+%
+% \section{\getstored[2]{defexercise}} % \getstored are robust :)
+% \end{document}
+% \end{VerbatimOut}
+%
+% Adaptation of example from package \mypkg{filecontentsdef}
+% \textattachfile[color=0 0 1]{scexamp2.ltx}{\faFile*[regular]}.
+% \lstinputlisting[language=scontents-doc,numbers=left]{scexamp2.ltx}
+%
+% \subsection{From TeX-SX}
+%
+% \subsubsection*{Example 3}
+%
+% \begin{VerbatimOut}{scexamp3.ltx}
+% \documentclass{article}
+% \usepackage[store-cmd=tikz]{scontents}
+% \usepackage{tikz}
+% \pagestyle{empty}
+% \Scontents*{\matrix{ \node (a) {$a$} ; & \node (b) {$b$} ; \\ } ;}
+% \Scontents*{\matrix[ampersand replacement=\&]
+%    { \node (a) {$a$} ; \& \node (b) {$b$} ; \\ } ;}
+% \Scontents*{\matrix{\node (a) {$a$} ; & \node (b) {$b$} ; \\ } ; }
+% \begin{document}
+% \section{tikzpicture}
+% \begin{tikzpicture}
+% \getstored[1]{tikz}
+% \end{tikzpicture}
+% \begin{tikzpicture}
+% \getstored[2]{tikz}
+% \end{tikzpicture}
+% \begin{tikzpicture}
+% \getstored[3]{tikz}
+% \end{tikzpicture}
+% \section{source}
+% \foreach \i in {1,...,\countsc{tikz}}{
+% \typestored*[\i]{tikz}}
+% \end{document}
+% \end{VerbatimOut}
+% Adapted from \href{https://tex.stackexchange.com/q/5338/7832}{LaTeX equivalent of ConTeXt buffers}
+% \textattachfile[color=0 0 1]{scexamp3.ltx}{\faFile*[regular]}.
+% \lstinputlisting[language=scontents-doc,numbers=left]{scexamp3.ltx}
+%
+% \subsubsection*{Example 4}
+%
+% \begin{VerbatimOut}{scexamp4.ltx}
+% \documentclass{article}
+% \usepackage{scontents}
+% \usepackage{pgffor}
+% \pagestyle{empty}
+% \begin{document}
+% \begin{scontents}[store-env=a]
+% Something for a
+% \end{scontents}
+%
+% \begin{scontents}[store-env=a]
+% Something for b
+% \end{scontents}
+%
+% \begin{scontents}[store-env=a]
+% Something with no label
+% \end{scontents}
+%
+% \textbf{Let's print them}
+%
+% This is a: \getstored[1]{a}
+%
+% This is b: \getstored[2]{a}
+%
+% \textbf{Print all of them}
+%
+% \foreach \i in {1,...,\countsc{a}} {\getstored[\i]{a}\par}
+% \end{document}
+% \end{VerbatimOut}
+%
+% Adapted from \href{https://tex.stackexchange.com/q/184503/7832}{Collecting contents of environment and store them for later retrieval}
+% \textattachfile[color=0 0 1]{scexamp4.ltx}{\faFile*[regular]}.
+% \lstinputlisting[language=scontents-doc,numbers=left]{scexamp4.ltx}
+%
+% \subsubsection*{Example 5}
+%
+% \begin{VerbatimOut}{scexamp5.ltx}
+% \documentclass{article}
+% \usepackage{scontents}
+% \pagestyle{empty}
+% \setlength{\parindent}{0pt}
+% \begin{document}
+% \section{Problem stated the first time}
+% \begin{scontents}[print-env=true,store-env=problem]
+% This is normal text. \verb+This is from the verb command+. This is normal text.
+% \verb*|This is from the verb* command|. This is normal text.
+% \begin{verbatim}
+% This is from the verbatim environment:
+% &%{}
+% \end{verbatim}
+% \end{scontents}
+% \section{Problem restated}
+% \getstored[1]{problem}
+% \section{Problem restated once more}
+% \getstored[1]{problem}
+% \end{document}
+% \end{VerbatimOut}
+%
+% Adapted from \href{https://tex.stackexchange.com/q/373647/7832}{Collect contents of an environment (that contains verbatim content)}
+% \textattachfile[color=0 0 1]{scexamp5.ltx}{\faFile*[regular]}.
+% \lstinputlisting[language=scontents-doc,numbers=left]{scexamp5.ltx}
+%
+% \subsection{Customization of verbatimsc}
+%
+% \subsubsection*{Example 6}
+%
+% \begin{VerbatimOut}{scexamp6.ltx}
+% \documentclass{article}
+% \usepackage{scontents}
+% \makeatletter
+% \let\verbatimsc\@undefined
+% \let\endverbatimsc\@undefined
+% \makeatother
+% \usepackage{fvextra}
+% \usepackage{xcolor}
+% \definecolor{mygray}{gray}{0.9}
+% \usepackage{tcolorbox}
+% \newenvironment{verbatimsc}%
+% {\VerbatimEnvironment
+%  \begin{tcolorbox}[colback=mygray, boxsep=0pt, arc=0pt, boxrule=0pt]
+%  \begin{Verbatim}[fontsize=\scriptsize, breaklines, breakafter=*, breaksymbolsep=0.5em,
+%    breakaftersymbolpre={\,\tiny\ensuremath{\rfloor}}]}%
+% {\end{Verbatim}%
+%  \end{tcolorbox}}
+% \setlength{\parindent}{0pt}
+% \pagestyle{empty}
+% \begin{document}
+%
+% \section{Test \texttt{\textbackslash begin\{scontents\}} whit \texttt{fancyvrb}}
+% Test \verb+\begin{scontents}+ \par
+%
+% \begin{scontents}
+% Using \verb+scontents+ env no \verb+[key=val]+, save in seq \verb+contents+
+% with index 1.
+%
+% Prove new \Verb*{ fancyvrb whit braces } and environment \verb+Verbatim*+
+% \begin{verbatim}
+%     verbatim  environment
+% \end{verbatim}
+% \end{scontents}
+%
+% \section{Test \texttt{\textbackslash Scontents} whit \texttt{fancyvrb}}
+%
+% \Scontents{ We have coded this in \LaTeX: $E=mc^2$.}
+%
+% \section{Test \texttt{\textbackslash getstored}}
+%
+% \getstored[1]{contents}\par
+% \getstored[2]{contents}
+%
+% \section{Test \texttt{\textbackslash meaningsc}}
+%
+% \meaningsc[1]{contents}\par
+%
+% \meaningsc[2]{contents}
+%
+% \section{Test \texttt{\textbackslash typestored}}
+%
+% \typestored[1]{contents}
+%
+% \typestored*[2]{contents}
+% \end{document}
+% \end{VerbatimOut}
+% Customization of \myenv*{verbatimsc} using the \mypkg{fancyvrb} and \mypkg{tcolorbox} package
+% \textattachfile[color=0 0 1]{scexamp6.ltx}{\faFile*[regular]}.
+% \lstinputlisting[language=scontents-doc,numbers=left]{scexamp6.ltx}
+%
+% \subsubsection*{Example 7}
+%
+% \begin{VerbatimOut}{scexamp7.ltx}
+% \documentclass{article}
+% \usepackage{scontents}
+% \makeatletter
+% \let\verbatimsc\@undefined
+% \let\endverbatimsc\@undefined
+% \makeatother
+% \usepackage{xcolor}
+% \usepackage{listings}
+% \lstnewenvironment{verbatimsc}
+%  {
+%   \lstset{
+%           basicstyle=\small\ttfamily,
+%           breaklines=true,
+%           columns=fullflexible,
+%           language=[LaTeX]TeX,
+%           numbers=left,
+%           numbersep=1em,
+%           numberstyle=\tiny\color{gray},
+%           keywordstyle=\color{red}
+%           }
+%  }{}
+% \setlength{\parindent}{0pt}
+% \pagestyle{empty}
+% \begin{document}
+%
+% \section{Test \texttt{\textbackslash begin\{scontents\}} whit \texttt{listings}}
+% Test \verb+\begin{scontents}+ \par
+%
+% \begin{scontents}
+% Using \verb+scontents+ env no \verb+[key=val]+, save in seq \verb+contents+ with index 1.\par
+%
+% Prove \lstinline[basicstyle=\ttfamily]| lstinline | and environment \verb+Verbatim*+
+% \begin{verbatim}
+%      verbatim  environment
+% \end{verbatim}
+% \end{scontents}
+%
+% \section{Test \texttt{\textbackslash Scontents*} whit \texttt{listings}}
+%
+% \Scontents*+ We have coded this in \lstinline[basicstyle=\ttfamily]|\LaTeX: $E=mc^2$|
+% and more.+
+%
+% \section{Test \texttt{\textbackslash getstored}}
+%
+% \getstored[2]{contents}\par
+%
+% \getstored[1]{contents}
+%
+% \section{Test \texttt{\textbackslash typestored}}
+%
+% \typestored[1]{contents}
+% \typestored*[2]{contents}
+% \end{document}
+% \end{VerbatimOut}
+% Customization of \myenv*{verbatimsc} using the \mypkg{listings} package
+% \textattachfile[color=0 0 1]{scexamp7.ltx}{\faFile*[regular]}.
+% \lstinputlisting[language=scontents-doc,numbers=left]{scexamp7.ltx}
+%
+% \subsubsection*{Example 8}
+%
+% \begin{VerbatimOut}{scexamp8.ltx}
+% \documentclass{article} % need shell-escape
+% \usepackage{scontents}
+% \makeatletter
+% \let\verbatimsc\@undefined
+% \let\endverbatimsc\@undefined
+% \makeatother
+% \usepackage{minted}
+% \newminted{tex}{linenos}
+% \newenvironment{verbatimsc}{\VerbatimEnvironment\begin{texcode}}{\end{texcode}}
+% \pagestyle{empty}
+% \begin{document}
+% \section{Test \texttt{\textbackslash begin\{scontents\}} whit \texttt{minted}}
+% Test \verb+\begin{scontents}+ \par
+%
+% \begin{scontents}
+% Using \verb+scontents+ env no \verb+[key=val]+, save in seq \verb+contents+ with index 1.\par
+%
+% Prove new \Verb*{ new fvextra whit braces } and environment \verb+Verbatim*+
+% \begin{verbatim}
+%      verbatim environment
+% \end{verbatim}
+% \end{scontents}
+%
+% \section{Test \texttt{\textbackslash Scontents} whit \texttt{minted}}
+%
+% \Scontents{ We have coded \par this in \LaTeX: $E=mc^2$.}
+%
+% \section{Test \texttt{\textbackslash getstored}}
+% \getstored[2]{contents}\par
+%
+% \getstored[1]{contents}
+%
+% \section{Test \texttt{\textbackslash typestored}}
+%
+% \typestored[1]{contents}
+% \end{document}
+% \end{VerbatimOut}
+% Customization of \myenv*{verbatimsc} using the \mypkg{minted} package
+% \textattachfile[color=0 0 1]{scexamp8.ltx}{\faFile*[regular]}.
+% \lstinputlisting[language=scontents-doc,numbers=left]{scexamp8.ltx}
+%
+% \newpage
+%
+% \printindex[mydoc]
+% \newpage
+% \StopEventually{^^A
+% \newgeometry{top=0.5in,bottom=0.5in,left=1.0in,right=1in,footskip=0.2in,headsep=10pt}
+% \addtocontents{toc}{\protect\setcounter{tocdepth}{2}}
+% \cleardoublepage
+% \phantomsection
+% \printindex
+% }
+%
+% \section{Implementation}
+% \label{sec:Implementation}
+% \addtocontents{toc}{\protect\setcounter{tocdepth}{0}}
+% \iffalse
+%<*package>
+% \fi
+%
+% \subsection{Declaration of the package}
+%
+% First we set up the module name for \pkg{l3doc}:
+%    \begin{macrocode}
+%<@@=scontents>
+%    \end{macrocode}
+%
+% Then, we can give the traditional declaration of a package written with
+% \pkg{expl3} and the necessary packages for its operation.
+%    \begin{macrocode}
+\RequirePackage{filecontentsdef}[2019/04/20]
+\RequirePackage{l3keys2e}
+\RequirePackage{xparse}[2019/05/03]
+\ProvidesExplPackage{scontents}{2019/07/30}{1.0}
+  {Store LaTeX content in Sequences (l3seq)}
+%    \end{macrocode}
+% A check to make sure that \pkg{xparse} is not too old
+%    \begin{macrocode}
+\@ifpackagelater { xparse } { 2019/05/03 }
+  { }
+  {
+    \PackageError { scontents } { Support~package~xparse~too~old }
+      {
+        You~need~to~update~your~installation~of~the~bundles~
+        'l3kernel'~and~'l3packages'.\MessageBreak
+        Loading~scontents~will~abort!
+      }
+    \tex_endinput:D
+  }
+%    \end{macrocode}
+%
+% \subsection{Definition of common keys}
+%
+% We create some common keys that will be used by the options passed to
+% the package as well as by the environments and commands defined.
+%    \begin{macrocode}
+\keys_define:nn { scontents }
+  {
+    store-env .tl_set:N         = \l_@@_name_seq_env_tl,
+    store-env .initial:n        = contents,
+    print-env .bool_set:N       = \l_@@_print_env_bool,
+    print-env .initial:n        = false,
+    store-cmd .tl_set:N         = \l_@@_name_seq_cmd_tl,
+    store-cmd .initial:n        = contents,
+    print-cmd .bool_set:N       = \l_@@_print_cmd_bool,
+    print-cmd .initial:n        = false,
+    print-all .meta:n           = { print-env = true , print-cmd = true },
+    store-env .value_required:n = true,
+    store-cmd .value_required:n = true,
+    print-env .value_required:n = true,
+    print-cmd .value_required:n = true,
+    print-all .value_required:n = true
+  }
+%    \end{macrocode}
+%
+% We process the keys as options passed on to the package.
+%%^^A Process options for pkg
+%    \begin{macrocode}
+\ProcessKeysOptions { scontents }
+%    \end{macrocode}
+%
+% \subsection{Internal variables}
+%
+% Now we declare the internal variables we will use.
+%
+%%^^A Internal tl vars
+% \begin{macro}{\l_@@_macro_tmp_tl,\l_@@_fname_out_tl,\l_@@_temp_tl}
+%   \cs{l_@@_macro_tmp_tl} is a temporary token list to hold the contents
+%   of the macro/environment, \cs{l_@@_fname_out_tl} is used as the name
+%   of the output file, when there's one, and \cs{l_@@_temp_tl} is a
+%   generic temporary token list.
+%    \begin{macrocode}
+\tl_new:N \l_@@_macro_tmp_tl
+\tl_new:N \l_@@_fname_out_tl
+\tl_new:N \l_@@_temp_tl
+%    \end{macrocode}
+% \end{macro}
+%
+%%^^A Internal bool vars
+% \begin{macro}{\l_@@_typeverb_env_bool,\l_@@_writing_bool,
+%      \l_@@_storing_bool}
+%   The boolean \cs{l_@@_typeverb_env_bool} keeps track whether the
+%   starred variant of the \cs{typestored} macro was used,
+%   \cs{l_@@_writing_bool} if we should write to a file, and
+%   \cs{l_@@_storing_bool} determines whether it is in write-only mode
+%    when the |write-out| option is used.
+%    \begin{macrocode}
+\bool_new:N \l_@@_typeverb_env_bool
+\bool_set_true:N  \l_@@_typevrb_env_bool
+\bool_new:N \l_@@_writing_bool
+\bool_set_false:N \l_@@_writing_bool
+\bool_new:N \l_@@_storing_bool
+\bool_set_true:N  \l_@@_storing_bool
+%    \end{macrocode}
+% \end{macro}
+%
+%%^^A Internal quarks
+% \begin{macro}{\q_@@_stop,\q_@@_mark}
+%   Some quarks used along the code as macro delimiters.
+%    \begin{macrocode}
+\quark_new:N \q_@@_stop
+\quark_new:N \q_@@_mark
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\g_@@_end_verbatimsc_tl}
+%   A token list to match when ending verbatim environments.
+%    \begin{macrocode}
+\tl_new:N \g_@@_end_verbatimsc_tl
+\tl_gset_rescan:Nnn
+  \g_@@_end_verbatimsc_tl
+  {
+    \char_set_catcode_escape:N \|
+    \char_set_catcode_other:N \\
+    \char_set_catcode_other:N \{
+    \char_set_catcode_other:N \}
+  }
+  { \end{verbatimsc} }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{Add keys for environment}
+%
+% We define a set of keys for environment \env{scontents}.
+%%^^A Add keys to scontents environnment
+%    \begin{macrocode}
+\keys_define:nn { scontents }
+  {
+    write-env .code:n           = {
+                                    \bool_set_true:N \l_@@_writing_bool
+                                    \tl_set:Nn \l_@@_fname_out_tl {#1}
+                                  },
+    write-out .code:n           = {
+                                    \bool_set_false:N \l_@@_storing_bool
+                                    \bool_set_true:N  \l_@@_writing_bool
+                                    \tl_set:Nn \l_@@_fname_out_tl {#1}
+                                  },
+    write-env .value_required:n = true,
+    write-out .value_required:n = true
+  }
+%    \end{macrocode}
+%
+% \subsection{Define keys for command}
+%
+% A sub/keys for command |\Scontents| and |\Scontents*|
+%
+%%^^A A sub/keys for command |\Scontents|
+%    \begin{macrocode}
+\keys_define:nn { scontents / Scontents }
+  {
+    print-cmd .meta:nn = { scontents } { print-cmd = #1 },
+    store-cmd .meta:nn = { scontents } { store-cmd = #1 }
+  }
+%    \end{macrocode}
+%
+% \subsection{Programming of the sequences}
+%
+%%^^A Append content to seq
+% \begin{macro}{\@@_append_contents:nn,\@@_getfrom_seq:nn}
+%   The storage of the package is done using |seq| variables.  Here we
+%   set up the macros that will manage the variables.
+%
+%   \cs{@@_append_contents:nn} creates a seq variable if one didn't
+%   exist and appends the contents in the argument to the right of the
+%   sequence.  \cs{@@_getfrom_seq:nn} retrieves the saved item from the
+%   sequence.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_append_contents:nn #1#2
+  {
+    \tl_if_blank:nT {#1}
+      { \msg_error:nn { scontents } { empty-store-cmd } }
+    \seq_if_exist:cF { g_@@_seq_name_#1_seq }
+      { \seq_new:c { g_@@_seq_name_#1_seq } }
+    \seq_gput_right:cn { g_@@_seq_name_#1_seq } {#2}
+  }
+\cs_generate_variant:Nn \@@_append_contents:nn { Vx }
+\cs_new:Npn \@@_getfrom_seq:nn #1#2
+  { \seq_item:cn { g_@@_seq_name_#2_seq } {#1} }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{Construction of environment scontents}
+%
+% We define the environment \env{scontents}, next to the system |key=val|.
+% The environment is divided into three parts.  This implementation is taken
+% from answer by Enrico Gregorio in \url{https://tex.stackexchange.com/a/487746/7832}.
+%
+%%^^A Define |scontents| whit [key=val] (delaying)
+% \begin{macro}{scontents}
+%   This is the main environment used in the document.
+%    \begin{macrocode}
+\ProvideDocumentEnvironment { scontents } { }
+  {
+    \char_set_catcode_active:N \^^M
+    \@@_start_environment:w
+  }
+  {
+    \@@_stop_environment:
+    \@@_atend_environment:
+  }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{The environment itself}
+%
+% The environment itself
+%
+%%^^A First \cs{@@_start_environment:w}
+% \begin{macro}{\@@_start_environment:w,\@@_stop_environment:}
+%   Here we make |^^M| an active character so that the end of line can
+%   be ``seen'' to be used as a delimiter.  First we check if the line
+%   directly after |\begin{scontents}| contains an optional argument
+%   enclosed in |[...]|, or other tokens.  The trailing tokens are
+%   treated as junk and an error is raised.  The
+%   \cs{@@_environment_inline:w} macro checks for those cases.
+%    \begin{macrocode}
+\group_begin:
+  \char_set_catcode_active:N \^^M
+  \cs_new_protected:Npn \@@_start_environment:w #1 ^^M
+    {
+      \@@_environment_inline:w #1 \q_@@_mark
+      \group_begin:
+        \bool_if:NTF \l_@@_writing_bool
+          {
+            \use:c { filecontentsdef* } { \l_@@_fname_out_tl }
+                                        { \l_@@_macro_tmp_tl } ^^M
+          }
+          { \filecontentsdefmacro { \l_@@_macro_tmp_tl } ^^M }
+    }
+  \cs_new_protected:Npn \@@_stop_environment:
+    {
+        \bool_if:NTF \l_@@_writing_bool
+          { \endfilecontentsdef }
+          { \endfilecontentsdefmacro }
+      \group_end:
+    }
+\group_end:
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{key val for environment}
+%
+% Define a |key=val| for environment \env{scontents}
+%
+%%^^A key val for environment scontents
+% \begin{macro}{\@@_environment_inline:w,\@@_environment_keys:w,
+%      \@@_environment_junk:nw,\@@_environment_junk:xw}
+%   The macro \cs{@@_environment_inline:w} is called from the
+%   \env{scontents} environment with the tokens following the
+%   |\begin{scontents}|.  If the immediate next token (ignoring spaces)
+%   is a |[|, then we look for an optional argument delimited by a |]|.
+%   All the remaining tokens are treated as junk and an error is raised
+%   if they are non-blank.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_environment_inline:w
+  {
+    \peek_charcode_ignore_spaces:NTF [ % ]
+      { \@@_environment_keys:w }
+      {
+        \@@_environment_junk:xw
+          { after~\c_backslash_str begin{scontents} }
+      }
+  }
+\cs_new_protected:Npn \@@_environment_keys:w [ #1 ]
+  {
+    \keys_set_known:nn { scontents } {#1}
+    \@@_environment_junk:xw
+      { after~optional~argument~to~\c_backslash_str begin{scontents} }
+  }
+\cs_new_protected:Npn \@@_environment_junk:nw #1 #2 \q_@@_mark
+  {
+    \tl_if_blank:nF {#2}
+      { \msg_error:nnnn { scontents } { junk-after-begin } {#1} {#2} }
+  }
+\cs_generate_variant:Nn \@@_environment_junk:nw { x }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Recording of the content in the sequence}
+%
+% \begin{macro}{\@@_atend_environment:,\@@_stored_to_seq:}
+%   Finishes the environment by optionally calling \cs{@@_stored_to_seq:}
+%   and then clearing the temporary token list.
+%
+%   The \cs{@@_stored_to_seq:} function replaces a carriage return
+%   (\textsc{ascii} 13) by a new line character (\textsc{ascii} 10) for
+%   optionally logging the contents of the current \env{scontents}
+%   environment.
+%
+%^^A TODO: Perhaps replace the regex by a delimited macro to improve
+%^^A       performance... Or temporarily redefine ^^M to mean ^^J...
+%^^A Reply: Or maybe it is better to preserve the end of line with
+%^^A       \tex_newlinechar:D = 13 \scan_stop:
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_atend_environment:
+  {
+    \bool_if:NT \l_@@_storing_bool
+      {
+        \@@_stored_to_seq:
+        \bool_if:NT \l_@@_print_env_bool
+          { \@@_getfrom_seq:nn { -1 } { \l_@@_name_seq_env_tl } }
+      }
+    \tl_clear:N \l_@@_macro_tmp_tl
+  }
+\cs_gset_protected:Npn \@@_stored_to_seq:
+  {
+    \regex_replace_all:nnN { \^^M } { \^^J } \l_@@_macro_tmp_tl
+    \tl_log:N \l_@@_macro_tmp_tl
+    \@@_append_contents:Vx \l_@@_name_seq_env_tl
+      { \exp_not:N \tex_scantokens:D { \tl_use:N \l_@@_macro_tmp_tl } }
+  }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{The \cs{Scontents} command}
+%
+% User command to stored content, adapted from
+% \url{https://tex.stackexchange.com/a/500281/7832}.
+%
+%%^^A User command to stored content
+% 
+% \begin{macro}{\Scontents,\@@_norm:n,\@@_verb:w}
+%   The \cs{Scontents} macro starts by parsing an optional argument and
+%   then delegates to \cs{@@_verb:w} or \cs{@@_norm:n} depending whether
+%   a star argument is present.
+%
+%   \cs{@@_norm:n} grabs a normal argument, adds it to the |seq| varaible,
+%   and optionally prints it.
+%
+%   \cs{@@_verb:w} grabs a verbatim argument using \pkg{xparse}'s |v|
+%   argument parser.
+%
+%^^A NOTE: Any particular reason why \keys_set_known:nn instead of just
+%^^A       \keys_set:nn? The latter reports if an unknown key is used...
+%^^A Reply: The redirection of error messages has never worked well for me
+%^^A       perhaps it would be better to implement it.
+%    \begin{macrocode}
+\ProvideDocumentCommand { \Scontents }{ !s !O{} }
+  {
+    \group_begin:
+      \IfNoValueF {#2}
+        { \keys_set_known:nn { scontents / Scontents } {#2} }
+      \IfBooleanTF{#1}
+        { \@@_verb:w }
+        { \@@_norm:n }
+  }
+\cs_new_protected:Npn \@@_norm:n #1
+  {
+     \exp_args:NV \@@_append_contents:nn \l_@@_name_seq_cmd_tl {#1}
+     \bool_if:NT \l_@@_print_cmd_bool
+       { \@@_getfrom_seq:nn { -1 } { \l_@@_name_seq_cmd_tl } }
+   \group_end:
+  }
+\NewDocumentCommand { \@@_verb:w } { +v }
+  {
+      \tl_set:Nn \l_@@_temp_tl {#1}
+      \regex_replace_all:nnN { \^^M } { \^^J } \l_@@_temp_tl
+      \tl_log:N \l_@@_temp_tl
+      \exp_args:NVx \@@_append_contents:nn \l_@@_name_seq_cmd_tl
+        { \exp_not:N \tex_scantokens:D { \tl_use:N \l_@@_temp_tl } }
+      \bool_if:NT \l_@@_print_cmd_bool
+        { \@@_getfrom_seq:nn { -1 } { \l_@@_name_seq_cmd_tl } }
+    \group_end:
+  }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{The command \cs{getstored}}
+%
+%
+% \begin{macro}{\getstored}
+%   User command \cs{getstored} to extract stored content in |seq|
+%   (robust).
+%    \begin{macrocode}
+\ProvideDocumentCommand { \getstored } { O{1} m }
+  { \@@_getfrom_seq:nn {#1} {#2} }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{The \cs{typestored} command}
+%
+% This implementation is an adaptation taken from answer by Phelype Oleinik
+% in (\url{https://tex.stackexchange.com/a/497651/7832}).
+%
+% \begin{macro}{\typestored,\@@_fcdef_print:N,\@@_xverb:w,verbatimsc}
+%   The \cs{typestored} commands fetches a buffer from memory, prints it
+%   to the log file,
+%^^A NOTE: Perhaps this logging should be optional, with a key to switch
+%^^A       it on and off.
+%^^A Reply:I used * because it's easier to associate it with \Scontents*
+%   and then calls \pkg{filecontentsdef}'s \tn{filecontentsdef@get} macro
+%   to read the contents of the token list and pass them to
+%   \cs{@@_fcdef_print:N}.
+%    \begin{macrocode}
+\ProvideDocumentCommand { \typestored } { s O{1} m }
+  {
+    \group_begin:
+      \tl_set:Nx \l_@@_temp_tl { \@@_getfrom_seq:nn {#2} {#3} }
+      \tl_log:N \l_@@_temp_tl
+      \IfBooleanTF {#1}
+        { \bool_set_false:N \l_@@_typeverb_env_bool }
+        { \bool_set_true:N  \l_@@_typeverb_env_bool }
+      \use:c { filecontentsdef@get } \@@_fcdef_print:N \l_@@_temp_tl
+    \group_end:
+  }
+%    \end{macrocode}
+%   The \cs{@@_fcdef_print:N} macro is defined with active carriage return
+%   (\textsc{ascii} 13) characters to mimick an actual verbatim environment
+%   ``on the loose''. The contents of the environment are placed in a
+%   \env{verbatimsc} environment and rescanned using \tn{scantokens}.
+%    \begin{macrocode}
+\group_begin:
+ \char_set_catcode_active:N \^^M
+ \cs_new_protected:Npn \@@_fcdef_print:N #1
+    {
+      \tl_if_blank:VT #1
+        { \msg_error:nnn { scontents } { empty-variable } {#1} }
+      \cs_set_eq:NN \@@_fcdef_saved_EOL: ^^M
+      \cs_set_eq:NN ^^M \scan_stop:
+      \use:x
+        {
+          \exp_not:N \tex_scantokens:D
+            {
+              \exp_not:N \begin{verbatimsc} ^^M
+              \@@_strip_scantokens:N #1
+              \bool_if:NF \l_@@_typeverb_env_bool { ^^M }
+              \g_@@_end_verbatimsc_tl
+            }
+        }
+      \cs_set_eq:NN ^^M \@@_fcdef_saved_EOL:
+    }
+\group_end:
+%    \end{macrocode}
+%   Finally, the \env{verbatimsc} environment is defined.
+%^^A An idea taken from spverbatim
+%    \begin{macrocode}
+\use:x
+  { \cs_gset_protected:Npn \exp_not:N \@@_xverb:w ##1 \g_@@_end_verbatimsc_tl }
+      { #1 \end{verbatimsc} }
+\ProvideDocumentEnvironment { verbatimsc } { }
+  {
+    \cs_set_eq:cN { @xverbatim } \@@_xverb:w
+    \verbatim
+  }
+  { }
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{
+%     \@@_strip_scantokens:N,
+%     \@@_strip_scantokens:n,
+%     \@@_if_scantokens:Nw,
+%   }
+%   The \cs{@@_strip_scantokens:n} (\cs{@@_strip_scantokens:N}) macro
+%   takes a token list (variable) as argument and examines it. If the
+%   argument token list is \emph{exactly} |\scantokens{|\meta{stuff}|}|,
+%   then the function returns \meta{stuff}, otherwise it returns the
+%   input token list without change. The token list is wrapped in
+%   \cs{exp_not:n} to avoid further expansion.
+%    \begin{macrocode}
+\cs_new:Npn \@@_strip_scantokens:N #1
+  { \exp_args:NV \@@_strip_scantokens:n #1 }
+\cs_new:Npn \@@_strip_scantokens:n #1
+  {
+    \tl_if_head_is_N_type:nTF {#1}
+      {
+        \@@_if_scantokens:NwTF #1 \q_@@_mark
+          {
+            \exp_args:No \tl_if_single_token:nTF { \use_none:nn #1 ? }
+              { \exp_not:o { \use_ii:nn #1 } }
+              { \exp_not:n {#1} }
+          }
+          { \exp_not:n {#1} }
+      }
+      { \exp_not:n {#1} }
+  }
+\prg_new_conditional:Npnn \@@_if_scantokens:Nw #1#2 \q_@@_mark { TF }
+  {
+    \token_if_eq_meaning:NNTF \tex_scantokens:D #1
+      { \prg_return_true: }
+      { \prg_return_false: }
+  }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{The command \cs{setupsc}}
+%
+% User command \cs{setupsc} to setup module.
+%%^^A User command to setup module
+% \begin{macro}{\setupsc}
+%   A user-level wrapper for \cs{keys_set:nn}|{ scontents }|
+%    \begin{macrocode}
+\ProvideDocumentCommand { \setupsc } { m }
+  { \keys_set:nn { scontents } {#1} }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{The command meaningsc}
+%
+% \begin{macro}{\meaningsc}
+%   User command \cs{meaningsc} to see content stored in seq.
+%^^A NOTE: Perhaps replace \cs{regex_replace_all:nnN} by something more
+%^^A       efficient...
+%^^A Reply: I've only used it to avoid ΩΩ ...
+%    \begin{macrocode}
+\ProvideDocumentCommand { \meaningsc } { O{1} m }
+  {
+    \group_begin:
+      \tl_set:Nx \l_@@_temp_tl { \@@_getfrom_seq:nn {#1} {#2} }
+      \tl_log:N \l_@@_temp_tl
+      \tl_set:Nx \l_@@_temp_tl { \@@_strip_scantokens:N \l_@@_temp_tl }
+      \regex_replace_all:nnN { \v{1,} } {   } \l_@@_temp_tl
+      \ttfamily
+      \cs_replacement_spec:N \l_@@_temp_tl
+    \group_end:
+  }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{The command \cs{countsc}}
+%
+% \begin{macro}{\countsc}
+%   User command \cs{countsc} to count number of contents stored in seq.
+%    \begin{macrocode}
+\ProvideExpandableDocumentCommand { \countsc } { m }
+  { \seq_count:c { g_@@_seq_name_#1_seq } }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{The command \cs{cleanseqsc}}
+%
+% \begin{macro}{\cleanseqsc}
+%   A user command \cs{cleanseqsc} to clear (remove) a defined seq
+%    \begin{macrocode}
+\ProvideExpandableDocumentCommand { \cleanseqsc } { m }
+  { \seq_clear_new:c { g_@@_seq_name_#1_seq } }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{Messages}
+% Messages used throughout the package.
+%%^^A Messages
+%
+%    \begin{macrocode}
+\msg_new:nnn { scontents } { junk-after-begin }
+  {
+    Junk~characters~#1~\msg_line_context: :
+    \\ \\
+    #2
+  }
+\msg_new:nnn { scontents } { empty-stored-content }
+  { Empty~value~for~key~`getstored'~\msg_line_context:. }
+\msg_new:nnn { scontents } { empty-variable }
+ { Variable~`#1'~empty~\msg_line_context:. }
+%    \end{macrocode}
+%
+% \subsection{Finish package}
+% Finish package
+%%^^A Finish package
+%
+%    \begin{macrocode}
+\file_input_stop:
+%    \end{macrocode}
+% \iffalse
+%</package>
+% \fi
+% \Finale
diff --git a/Master/texmf-dist/source/latex/scontents/scontents.ins b/Master/texmf-dist/source/latex/scontents/scontents.ins
new file mode 100644
index 00000000000..2b0d3865154
--- /dev/null
+++ b/Master/texmf-dist/source/latex/scontents/scontents.ins
@@ -0,0 +1,9 @@
+\input l3docstrip.tex
+\keepsilent
+\askforoverwritefalse
+\nopreamble\nopostamble
+\usedir{tex/latex/scontents}
+\generate{
+  \file{\jobname.sty}{\from{\jobname.dtx}{package}}
+}
+\endbatchfile
diff --git a/Master/texmf-dist/tex/latex/scontents/scontents.sty b/Master/texmf-dist/tex/latex/scontents/scontents.sty
new file mode 100644
index 00000000000..2f3dca7e604
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/scontents/scontents.sty
@@ -0,0 +1,287 @@
+\RequirePackage{filecontentsdef}[2019/04/20]
+\RequirePackage{l3keys2e}
+\RequirePackage{xparse}[2019/05/03]
+\ProvidesExplPackage{scontents}{2019/07/30}{1.0}
+  {Store LaTeX content in Sequences (l3seq)}
+\@ifpackagelater { xparse } { 2019/05/03 }
+  { }
+  {
+    \PackageError { scontents } { Support~package~xparse~too~old }
+      {
+        You~need~to~update~your~installation~of~the~bundles~
+        'l3kernel'~and~'l3packages'.\MessageBreak
+        Loading~scontents~will~abort!
+      }
+    \tex_endinput:D
+  }
+\keys_define:nn { scontents }
+  {
+    store-env .tl_set:N         = \l__scontents_name_seq_env_tl,
+    store-env .initial:n        = contents,
+    print-env .bool_set:N       = \l__scontents_print_env_bool,
+    print-env .initial:n        = false,
+    store-cmd .tl_set:N         = \l__scontents_name_seq_cmd_tl,
+    store-cmd .initial:n        = contents,
+    print-cmd .bool_set:N       = \l__scontents_print_cmd_bool,
+    print-cmd .initial:n        = false,
+    print-all .meta:n           = { print-env = true , print-cmd = true },
+    store-env .value_required:n = true,
+    store-cmd .value_required:n = true,
+    print-env .value_required:n = true,
+    print-cmd .value_required:n = true,
+    print-all .value_required:n = true
+  }
+%%^^A Process options for pkg
+\ProcessKeysOptions { scontents }
+%%^^A Internal tl vars
+\tl_new:N \l__scontents_macro_tmp_tl
+\tl_new:N \l__scontents_fname_out_tl
+\tl_new:N \l__scontents_temp_tl
+%%^^A Internal bool vars
+\bool_new:N \l__scontents_typeverb_env_bool
+\bool_set_true:N  \l__scontents_typevrb_env_bool
+\bool_new:N \l__scontents_writing_bool
+\bool_set_false:N \l__scontents_writing_bool
+\bool_new:N \l__scontents_storing_bool
+\bool_set_true:N  \l__scontents_storing_bool
+%%^^A Internal quarks
+\quark_new:N \q__scontents_stop
+\quark_new:N \q__scontents_mark
+\tl_new:N \g__scontents_end_verbatimsc_tl
+\tl_gset_rescan:Nnn
+  \g__scontents_end_verbatimsc_tl
+  {
+    \char_set_catcode_escape:N \|
+    \char_set_catcode_other:N \\
+    \char_set_catcode_other:N \{
+    \char_set_catcode_other:N \}
+  }
+  { \end{verbatimsc} }
+%%^^A Add keys to scontents environnment
+\keys_define:nn { scontents }
+  {
+    write-env .code:n           = {
+                                    \bool_set_true:N \l__scontents_writing_bool
+                                    \tl_set:Nn \l__scontents_fname_out_tl {#1}
+                                  },
+    write-out .code:n           = {
+                                    \bool_set_false:N \l__scontents_storing_bool
+                                    \bool_set_true:N  \l__scontents_writing_bool
+                                    \tl_set:Nn \l__scontents_fname_out_tl {#1}
+                                  },
+    write-env .value_required:n = true,
+    write-out .value_required:n = true
+  }
+%%^^A A sub/keys for command |\Scontents|
+\keys_define:nn { scontents / Scontents }
+  {
+    print-cmd .meta:nn = { scontents } { print-cmd = #1 },
+    store-cmd .meta:nn = { scontents } { store-cmd = #1 }
+  }
+%%^^A Append content to seq
+\cs_new_protected:Npn \__scontents_append_contents:nn #1#2
+  {
+    \tl_if_blank:nT {#1}
+      { \msg_error:nn { scontents } { empty-store-cmd } }
+    \seq_if_exist:cF { g__scontents_seq_name_#1_seq }
+      { \seq_new:c { g__scontents_seq_name_#1_seq } }
+    \seq_gput_right:cn { g__scontents_seq_name_#1_seq } {#2}
+  }
+\cs_generate_variant:Nn \__scontents_append_contents:nn { Vx }
+\cs_new:Npn \__scontents_getfrom_seq:nn #1#2
+  { \seq_item:cn { g__scontents_seq_name_#2_seq } {#1} }
+%%^^A Define |scontents| whit [key=val] (delaying)
+\ProvideDocumentEnvironment { scontents } { }
+  {
+    \char_set_catcode_active:N \^^M
+    \__scontents_start_environment:w
+  }
+  {
+    \__scontents_stop_environment:
+    \__scontents_atend_environment:
+  }
+%%^^A First \cs{@@_start_environment:w}
+\group_begin:
+  \char_set_catcode_active:N \^^M
+  \cs_new_protected:Npn \__scontents_start_environment:w #1 ^^M
+    {
+      \__scontents_environment_inline:w #1 \q__scontents_mark
+      \group_begin:
+        \bool_if:NTF \l__scontents_writing_bool
+          {
+            \use:c { filecontentsdef* } { \l__scontents_fname_out_tl }
+                                        { \l__scontents_macro_tmp_tl } ^^M
+          }
+          { \filecontentsdefmacro { \l__scontents_macro_tmp_tl } ^^M }
+    }
+  \cs_new_protected:Npn \__scontents_stop_environment:
+    {
+        \bool_if:NTF \l__scontents_writing_bool
+          { \endfilecontentsdef }
+          { \endfilecontentsdefmacro }
+      \group_end:
+    }
+\group_end:
+%%^^A key val for environment scontents
+\cs_new_protected:Npn \__scontents_environment_inline:w
+  {
+    \peek_charcode_ignore_spaces:NTF [ % ]
+      { \__scontents_environment_keys:w }
+      {
+        \__scontents_environment_junk:xw
+          { after~\c_backslash_str begin{scontents} }
+      }
+  }
+\cs_new_protected:Npn \__scontents_environment_keys:w [ #1 ]
+  {
+    \keys_set_known:nn { scontents } {#1}
+    \__scontents_environment_junk:xw
+      { after~optional~argument~to~\c_backslash_str begin{scontents} }
+  }
+\cs_new_protected:Npn \__scontents_environment_junk:nw #1 #2 \q__scontents_mark
+  {
+    \tl_if_blank:nF {#2}
+      { \msg_error:nnnn { scontents } { junk-after-begin } {#1} {#2} }
+  }
+\cs_generate_variant:Nn \__scontents_environment_junk:nw { x }
+\cs_new_protected:Npn \__scontents_atend_environment:
+  {
+    \bool_if:NT \l__scontents_storing_bool
+      {
+        \__scontents_stored_to_seq:
+        \bool_if:NT \l__scontents_print_env_bool
+          { \__scontents_getfrom_seq:nn { -1 } { \l__scontents_name_seq_env_tl } }
+      }
+    \tl_clear:N \l__scontents_macro_tmp_tl
+  }
+\cs_gset_protected:Npn \__scontents_stored_to_seq:
+  {
+    \regex_replace_all:nnN { \^^M } { \^^J } \l__scontents_macro_tmp_tl
+    \tl_log:N \l__scontents_macro_tmp_tl
+    \__scontents_append_contents:Vx \l__scontents_name_seq_env_tl
+      { \exp_not:N \tex_scantokens:D { \tl_use:N \l__scontents_macro_tmp_tl } }
+  }
+%%^^A User command to stored content
+\ProvideDocumentCommand { \Scontents }{ !s !O{} }
+  {
+    \group_begin:
+      \IfNoValueF {#2}
+        { \keys_set_known:nn { scontents / Scontents } {#2} }
+      \IfBooleanTF{#1}
+        { \__scontents_verb:w }
+        { \__scontents_norm:n }
+  }
+\cs_new_protected:Npn \__scontents_norm:n #1
+  {
+     \exp_args:NV \__scontents_append_contents:nn \l__scontents_name_seq_cmd_tl {#1}
+     \bool_if:NT \l__scontents_print_cmd_bool
+       { \__scontents_getfrom_seq:nn { -1 } { \l__scontents_name_seq_cmd_tl } }
+   \group_end:
+  }
+\NewDocumentCommand { \__scontents_verb:w } { +v }
+  {
+      \tl_set:Nn \l__scontents_temp_tl {#1}
+      \regex_replace_all:nnN { \^^M } { \^^J } \l__scontents_temp_tl
+      \tl_log:N \l__scontents_temp_tl
+      \exp_args:NVx \__scontents_append_contents:nn \l__scontents_name_seq_cmd_tl
+        { \exp_not:N \tex_scantokens:D { \tl_use:N \l__scontents_temp_tl } }
+      \bool_if:NT \l__scontents_print_cmd_bool
+        { \__scontents_getfrom_seq:nn { -1 } { \l__scontents_name_seq_cmd_tl } }
+    \group_end:
+  }
+\ProvideDocumentCommand { \getstored } { O{1} m }
+  { \__scontents_getfrom_seq:nn {#1} {#2} }
+\ProvideDocumentCommand { \typestored } { s O{1} m }
+  {
+    \group_begin:
+      \tl_set:Nx \l__scontents_temp_tl { \__scontents_getfrom_seq:nn {#2} {#3} }
+      \tl_log:N \l__scontents_temp_tl
+      \IfBooleanTF {#1}
+        { \bool_set_false:N \l__scontents_typeverb_env_bool }
+        { \bool_set_true:N  \l__scontents_typeverb_env_bool }
+      \use:c { filecontentsdef@get } \__scontents_fcdef_print:N \l__scontents_temp_tl
+    \group_end:
+  }
+\group_begin:
+ \char_set_catcode_active:N \^^M
+ \cs_new_protected:Npn \__scontents_fcdef_print:N #1
+    {
+      \tl_if_blank:VT #1
+        { \msg_error:nnn { scontents } { empty-variable } {#1} }
+      \cs_set_eq:NN \__scontents_fcdef_saved_EOL: ^^M
+      \cs_set_eq:NN ^^M \scan_stop:
+      \use:x
+        {
+          \exp_not:N \tex_scantokens:D
+            {
+              \exp_not:N \begin{verbatimsc} ^^M
+              \__scontents_strip_scantokens:N #1
+              \bool_if:NF \l__scontents_typeverb_env_bool { ^^M }
+              \g__scontents_end_verbatimsc_tl
+            }
+        }
+      \cs_set_eq:NN ^^M \__scontents_fcdef_saved_EOL:
+    }
+\group_end:
+\use:x
+  { \cs_gset_protected:Npn \exp_not:N \__scontents_xverb:w ##1 \g__scontents_end_verbatimsc_tl }
+      { #1 \end{verbatimsc} }
+\ProvideDocumentEnvironment { verbatimsc } { }
+  {
+    \cs_set_eq:cN { @xverbatim } \__scontents_xverb:w
+    \verbatim
+  }
+  { }
+\cs_new:Npn \__scontents_strip_scantokens:N #1
+  { \exp_args:NV \__scontents_strip_scantokens:n #1 }
+\cs_new:Npn \__scontents_strip_scantokens:n #1
+  {
+    \tl_if_head_is_N_type:nTF {#1}
+      {
+        \__scontents_if_scantokens:NwTF #1 \q__scontents_mark
+          {
+            \exp_args:No \tl_if_single_token:nTF { \use_none:nn #1 ? }
+              { \exp_not:o { \use_ii:nn #1 } }
+              { \exp_not:n {#1} }
+          }
+          { \exp_not:n {#1} }
+      }
+      { \exp_not:n {#1} }
+  }
+\prg_new_conditional:Npnn \__scontents_if_scantokens:Nw #1#2 \q__scontents_mark { TF }
+  {
+    \token_if_eq_meaning:NNTF \tex_scantokens:D #1
+      { \prg_return_true: }
+      { \prg_return_false: }
+  }
+%%^^A User command to setup module
+\ProvideDocumentCommand { \setupsc } { m }
+  { \keys_set:nn { scontents } {#1} }
+\ProvideDocumentCommand { \meaningsc } { O{1} m }
+  {
+    \group_begin:
+      \tl_set:Nx \l__scontents_temp_tl { \__scontents_getfrom_seq:nn {#1} {#2} }
+      \tl_log:N \l__scontents_temp_tl
+      \tl_set:Nx \l__scontents_temp_tl { \__scontents_strip_scantokens:N \l__scontents_temp_tl }
+      \regex_replace_all:nnN { \v{1,} } {   } \l__scontents_temp_tl
+      \ttfamily
+      \cs_replacement_spec:N \l__scontents_temp_tl
+    \group_end:
+  }
+\ProvideExpandableDocumentCommand { \countsc } { m }
+  { \seq_count:c { g__scontents_seq_name_#1_seq } }
+\ProvideExpandableDocumentCommand { \cleanseqsc } { m }
+  { \seq_clear_new:c { g__scontents_seq_name_#1_seq } }
+%%^^A Messages
+\msg_new:nnn { scontents } { junk-after-begin }
+  {
+    Junk~characters~#1~\msg_line_context: :
+    \\ \\
+    #2
+  }
+\msg_new:nnn { scontents } { empty-stored-content }
+  { Empty~value~for~key~`getstored'~\msg_line_context:. }
+\msg_new:nnn { scontents } { empty-variable }
+ { Variable~`#1'~empty~\msg_line_context:. }
+%%^^A Finish package
+\file_input_stop:
diff --git a/Master/tlpkg/bin/tlpkg-ctan-check b/Master/tlpkg/bin/tlpkg-ctan-check
index 786d331a6e0..4011c35646f 100755
--- a/Master/tlpkg/bin/tlpkg-ctan-check
+++ b/Master/tlpkg/bin/tlpkg-ctan-check
@@ -605,7 +605,7 @@ my @TLP_working = qw(
     scale scalebar scalerel scanpages
     schedule schemabloc schemata sclang-prettifier
     schule schulschriften schwalbe-chess
-    sciposter scientific-thesis-cover
+    sciposter scientific-thesis-cover scontents
     scratch scratch3 scratchx screenplay screenplay-pkg
     scrjrnl scrlttr2copy scsnowman
     sdrt sduthesis
diff --git a/Master/tlpkg/libexec/ctan2tds b/Master/tlpkg/libexec/ctan2tds
index 6188fc81738..87916587cd1 100755
--- a/Master/tlpkg/libexec/ctan2tds
+++ b/Master/tlpkg/libexec/ctan2tds
@@ -2720,6 +2720,7 @@ my $core_latex = "$Master/texmf-dist/tex/latex";
  'psfragx'      => 'latex',  # requires interaction
  'pxrubrica'    => 'platex',
  'schedule'     => 'latex',  # requires interaction
+ 'scontents'	=> 'etex',
  'silence'      => 'latex -translate-file=empty.tcx',   # no 8-bit
  'skdoc'        => 'tex',
  'svg'		=> 'etex -interaction=nonstopmode',
diff --git a/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc b/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc
index 3abebe7bf93..3a7014b4d85 100644
--- a/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc
+++ b/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc
@@ -982,6 +982,7 @@ depend scalebar
 depend scalerel
 depend scanpages
 depend schedule
+depend scontents
 depend scrlttr2copy
 depend sdrt
 depend secdot
diff --git a/Master/tlpkg/tlpsrc/scontents.tlpsrc b/Master/tlpkg/tlpsrc/scontents.tlpsrc
new file mode 100644
index 00000000000..e69de29bb2d
--- /dev/null
+++ b/Master/tlpkg/tlpsrc/scontents.tlpsrc