From ffded645119011854c6137bcb09d049d66c058f5 Mon Sep 17 00:00:00 2001
From: Karl Berry <karl@freefriends.org>
Date: Tue, 13 Mar 2018 22:00:35 +0000
Subject: duckuments (13mar18)

git-svn-id: svn://tug.org/texlive/trunk@46950 c570f23f-e606-0410-a88d-b1316a301751
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diff --git a/Master/texmf-dist/source/latex/duckuments/duckuments.dtx b/Master/texmf-dist/source/latex/duckuments/duckuments.dtx
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+% \iffalse meta-comment
+%
+% File: duckuments.dtx Copyright (C) 2018 Jonathan P. Spratte
+%
+% It may be distributed and/or modified under the conditions of the LaTeX
+% Project Public License (LPPL), either version 1.3c of this license or (at your
+% option) any later version.  The latest version of this license is in the file
+%
+%   https://www.latex-project.org/lppl.txt
+%
+% ------------------------------------------------------------------------------
+%
+%<*driver>
+\def\nameofplainTeX{plain}
+\ifx\fmtname\nameofplainTeX\else
+  \expandafter\begingroup
+\fi
+\input l3docstrip.tex
+\askforoverwritefalse
+\preamble
+
+--------------------------------------------------------------
+duckuments -- minimal working duckuments
+E-mail: jspratte@yahoo.de
+Released under the LaTeX Project Public License v1.3c or later
+See http://www.latex-project.org/lppl.txt
+--------------------------------------------------------------
+
+Copyright (C) 2018 Jonathan P. Spratte
+
+This  work may be  distributed and/or  modified under  the conditions  of the
+LaTeX Project Public License (LPPL),  either version 1.3c  of this license or
+(at your option) any later version.  The latest version of this license is in
+the file:
+
+  http://www.latex-project.org/lppl.txt
+
+This work is "maintained" (as per LPPL maintenance status) by
+  Jonathan P. Spratte.
+
+This work consists of the file  duckuments.dtx
+and the derived files           duckuments.pdf,
+                                duckuments.sty and
+                                example-image-duck.tex
+
+\endpreamble
+% stop docstrip adding \endinput
+\postamble
+\endpostamble
+\generate{\file{duckuments.sty}{\from{duckuments.dtx}{pkg}}}
+\generate{\file{example-image-duck.tex}{\from{duckuments.dtx}{eid}}}
+\ifx\fmtname\nameofplainTeX
+  \expandafter\endbatchfile
+\else
+  \expandafter\endgroup
+\fi
+%</driver>
+%
+%<*driver|pkg>
+\RequirePackage{xparse,letltxmacro,l3keys2e}
+%</driver|pkg>
+%
+%<*driver>
+\ProvidesFile{duckuments.dtx}[2018/03/13 minimal working duckuments]
+\documentclass{l3doc}
+\usepackage{enumitem}
+\newenvironment{options}
+  {\begin{description}[style=nextline,font=\normalfont\ttfamily]}
+  {\end{description}}
+\begin{document}
+  \DocInput{duckuments.dtx}
+\end{document}
+%</driver>
+%
+%<*eid>
+\documentclass[tikz,multi]{standalone}
+
+\usepackage{tikzducks}
+\usepackage{duckuments}
+
+\begin{document}
+\duckumentsDrawRandomDucks
+\end{document}
+%</eid>
+%
+%<*pkg>
+\def\duckuments@version{v0.1}
+\def\duckuments@date{2018/03/13}
+\ProvidesExplPackage
+  {duckuments}          {\duckuments@date}
+  {\duckuments@version} {minimal working duckuments}
+%</pkg>
+% \fi
+%
+% \title{The \pkg{duckuments} package}
+% \author{Jonathan P. Spratte\thanks{E-mail: jspratte@yahoo.de}}
+% \date{Released 2018/03/13}
+% \maketitle
+% \tableofcontents
+%
+% \begin{documentation}
+%
+% \section{Introduction}
+%
+% This package was inspired by the question
+% \href{https://tex.stackexchange.com/questions/419751}
+% {getting ducks in example images}.
+% It began on the idea to patch \cs{includegraphics} to automatically change its
+% behaviour if |example-image-duck| is used, but then it turned out to be a
+% simple alternative to the \pkg{blindtext} package.
+%
+% It is written as a docstrip file: executing |latex duckuments.dtx| generates
+% the \file{duckuments.sty} and \file{example-image-duck.tex} file and typesets
+% this duckumentation; execute |tex duckuments.dtx| to only generate the files
+% \file{duckuments.sty} and \file{example-image-duck.tex}.
+%
+% For its functionality \file{example-image-duck.tex} must be compiled at least
+% once. The sources are hosted on
+% \href{https://github.com/Skillmon/ltx_duckuments}{github}.
+%
+% \textbf{The package does currently only work on \pdfTeX\ and \LuaTeX}.
+%
+% \section{Duckumentation}
+%
+% \subsection{Dummy content}
+%
+% \begin{function}{\duckument}
+%   \begin{syntax}
+%     \cs{duckument}\oarg{key=value}
+%   \end{syntax}
+%   Produces a duckument with one sectioning entry of each level starting at
+%   \cs{chapter} (if available) and two variants of the list environment
+%   \env{itemize}, \env{enumerate}, and \env{description}, one only at top
+%   level and one with 4~environments nested. The \meta{key=value}s accept every
+%   key as explained in \autoref{sec:keys}, but not every key has an effect.
+% \end{function}
+%
+% \begin{function}{\blindduck}
+%   \begin{syntax}
+%     \cs{blindduck}\oarg{key=value}
+%   \end{syntax}
+%   Produces one paragraph of dummy content. The \meta{key=value}s accept every
+%   key as explained in \autoref{sec:keys}, but not every key has an effect.
+% \end{function}
+%
+% \begin{function}{\ducklist}
+%   \begin{syntax}
+%     \cs{ducklist}\meta{*}\marg{environment}
+%   \end{syntax}
+%   Sets a list of the specified \meta{environment}, if \meta{*} is given
+%   \cs{item}\oarg{dummy} is used instead of only \cs{item}. For |description|
+%   the starred version is used automatically.
+% \end{function}
+%
+% \begin{function}{\ducklistlist}
+%   \begin{syntax}
+%     \cs{ducklistlist}\meta{*}\marg{list}
+%   \end{syntax}
+%   Sets 4~levels of a nested list of the specified \meta{environment}, if
+%   \meta{*} is given \cs{item}\oarg{dummy} is used instead of only \cs{item}.
+%   For |description| the starred version is used automatically.
+% \end{function}
+%
+% \begin{function}{\duckitemize}
+%   Abbreviation for \cs{ducklist}|{itemize}|.
+% \end{function}
+%
+% \begin{function}{\duckenumerate}
+%   Abbreviation for \cs{ducklist}|{enumerate}|.
+% \end{function}
+%
+% \begin{function}{\duckdescription}
+%   Abbreviation for \cs{ducklist}|{description}|.
+% \end{function}
+%
+% \subsection{Other Macros}
+%
+% \begin{function}{\duckumentsCreateExampleFile}
+%   Creates the file \file{example-image-duck.tex} in the current working
+%   directory.
+% \end{function}
+%
+% \begin{function}{\duckumentsDrawRandomDucks}
+%   Draws \cs{duckuments@randoms} random \pkg{tikzducks} using
+%   \pkg{Ti\textit{k}Z}. Note that \pkg{duckuments} doesn't load
+%   \pkg{Ti\textit{k}Z}, this macro is for the use in
+%   \file{example-image-duck.tex}.
+% \end{function}
+%
+% \subsection{Patches}
+%
+% The package patches \cs{includegraphics} if it is defined at the time the
+% patch is applied (see \autoref{sec:keys}, |immediate|). The patch changes the
+% behaviour if |example-image-duck| is used. If that is the case, a random page
+% of that document is used. There shouldn't be any change in behaviour if other
+% files are used.
+%
+% The patch is done so that one can use \pkg{tikzducks} ducks without the need
+% of loading \pkg{tikz} in a minimal working duckument as example images.
+%
+% \subsection{Options}\label{sec:keys}
+%
+% The package and commands which take a \oarg{key=value} accept the following
+% options. Some of which only make sense as package options. The
+% \textbf{\texttt{bold}} printed value is the one used if you don't specify a
+% value.
+% \begin{options}
+%   \item[toc=\textbf{true}$\vert$false]
+%     If |true| the \cs{duckument} contains a ToC.
+%   \item[maths=\textbf{both}$\vert$inline$\vert$display$\vert$none]
+%     If |both| the \cs{blindduck} (which is also used by \cs{duckument})
+%     contains both inline and displayed math. With |inline| and |display| the
+%     respective maths is activated. |none| disables both.
+%   \item[immediate=\textbf{true}$\vert$false]
+%     If |true| \cs{includegraphics} is patched during package load time, else
+%     the patching is done \cs{AtBeginDocument}.
+% \end{options}
+%
+% \end{documentation}
+%
+% \begin{implementation}
+%
+% \section{Implementation}
+%
+%    \begin{macrocode}
+%<*pkg>
+%    \end{macrocode}
+% 
+%    \begin{macrocode}
+%<@@=duckuments>
+%    \end{macrocode}
+%
+% \subsection{Check for possible problems}
+%
+% Check which engine is used.
+%    \begin{macrocode}
+\bool_if:nF { \sys_if_engine_luatex_p: || \sys_if_engine_pdftex_p: }
+  { %>>>
+    \msg_new:nnnn { duckuments } { incompatible } 
+      {
+        The~duckuments~package~is~currently~only~compatible~with~pdfTeX~and~
+        LuaTeX!
+      }
+      {
+        Sorry~for~that.
+      }
+    \msg_error:nn { duckuments } { incompatible }
+    \endinput
+  }%<<<
+%    \end{macrocode}
+%
+% Check whether \file{example-image-duck.pdf} exists.
+%    \begin{macrocode}
+\file_if_exist:nF { example-image-duck.pdf }
+  {%>>>
+%    \end{macrocode}
+% If the current \cs{jobname} doesn't match \file{example-image-duck} throw a
+% warning.
+%    \begin{macrocode}
+    \str_if_eq:VnF \c_sys_jobname_str { example-image-duck }
+      {
+        \msg_new:nnnn { duckuments } { missing-file }
+        {
+          The~file~`#1`~can't~be~found.~Make~sure~to~create~it
+          \tl_if_empty:nF{#2}{~#2}.
+        }
+        { Sorry~for~the~inconvenience.~#3 }
+        \msg_error:nnnnn { duckuments } { missing-file }
+          { example-image-duck.pdf }
+          {
+            by~compiling~example-image-duck.tex~at~least~once
+          }
+          {
+            If~you~don't~find~the~file~on~your~machine~you~can~use~
+            `\duckumentsCreateExampleFile`~in~your~document~to~produce~a~copy~
+            in~the~current~working~directory.
+          }
+      }
+  }%<<<
+%    \end{macrocode}
+%
+% \subsection{Variables}
+%
+% \begin{variable}{\duckuments@randoms}
+%   Stores the number of random ducks in \file{example-image-duck.pdf}.
+%    \begin{macrocode}
+\newcommand*\duckuments@randoms{100}
+%    \end{macrocode}
+% \end{variable}
+%
+%
+% \begin{variable}{\l_duckuments_immediate_bool}
+%   Stores whether the patch is to be done during package load time.
+%    \begin{macrocode}
+\bool_new:N \l_duckuments_immediate_bool
+%    \end{macrocode}
+% \end{variable}
+%
+% \begin{variable}{\l_duckuments_toc_bool}
+%   Stores whether to display a ToC in \cs{duckument}.
+%    \begin{macrocode}
+\bool_new:N \l_duckuments_toc_bool
+%    \end{macrocode}
+% \end{variable}
+%
+% \begin{variable}{\l_duckuments_math_inline_bool}
+%   Stores whether to display inline math in \cs{blindduck}.
+%    \begin{macrocode}
+\bool_new:N \l_duckuments_math_inline_bool
+%    \end{macrocode}
+% \end{variable}
+%
+% \begin{variable}{\l_duckuments_math_display_bool}
+%   Stores whether to display displayed math in \cs{blindduck}.
+%    \begin{macrocode}
+\bool_new:N \l_duckuments_math_display_bool
+%    \end{macrocode}
+% \end{variable}
+%
+% \subsection{Constants}
+%
+% \begin{variable}{\c_duckuments_regex}
+%   Regex against which the patch of \cs{includegraphics} is testing.
+%    \begin{macrocode}
+\regex_const:Nn \c_duckuments_regex
+  { example-image-duck|example-image-duck.pdf }
+%    \end{macrocode}
+% \end{variable}
+%
+% \subsection{Options and Configurations}
+%    \begin{macrocode}
+\keys_define:nn { duckuments }
+  {%>>>
+    ,toc   .bool_set:N = \l_duckuments_toc_bool
+    ,toc   .default:n = true
+    ,maths .choice:
+    ,maths / both    .code:n =
+      {
+        \bool_set_true:N \l_duckuments_math_inline_bool
+        \bool_set_true:N \l_duckuments_math_display_bool
+      }
+    ,maths / none    .code:n =
+      {
+        \bool_set_false:N \l_duckuments_math_inline_bool
+        \bool_set_false:N \l_duckuments_math_display_bool
+      }
+    ,maths / inline  .code:n = \bool_set_true:N \l_duckuments_math_inline_bool
+    ,maths / display .code:n = \bool_set_true:N \l_duckuments_math_display_bool
+    ,maths .default:n = both
+    ,immediate .bool_set:N = \l_duckuments_immediate_bool
+    ,immediate .default:n = true
+  }%<<<
+\ProcessKeysOptions { duckuments }
+\bool_if:NTF \l_duckuments_immediate_bool
+  { \AtEndOfPackage { \duckuments_patch_includegraphics: } }
+  { \AtBeginDocument { \duckuments_patch_includegraphics: } }
+%    \end{macrocode}
+%
+% \subsection{Functions}
+%
+% \subsubsection{Duckument Level}
+%
+% \begin{macro}{\duckument}
+%    \begin{macrocode}
+\NewDocumentCommand \duckument { O{} }
+  {%>>>
+    \group_begin:
+    \keys_set:nn { duckuments } { #1 }
+    \bool_if:NT \l_duckuments_toc_bool { \tableofcontents }
+    \cs_if_exist_use:NT \chapter
+      { {\duckuments@headings@text{0}} \blindduck }
+    \duckuments@headings{1} \blindduck
+    \duckuments@headings{2} \blindduck
+    \duckuments@headings{3} \blindduck
+    \duckuments@headings{4} \blindduck
+    \section {Lists}
+    \duckuments_list_example:n { itemize }
+    \duckuments_list_example:n { enumerate }
+    \duckuments_list_example:n { description }
+    \group_end:
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\blindduck}
+%    \begin{macrocode}
+\NewDocumentCommand \blindduck { O{} }
+  {%>>>
+    \group_begin:
+    \keys_set:nn { duckuments } { #1 }
+    \duckuments@blindduck@text
+    \group_end:
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ducklist}
+%    \begin{macrocode}
+\NewDocumentCommand \ducklist {s m}
+  {%>>>
+    \begin{#2}
+      \IfBooleanTF { #1 }
+        {\ducklists@content@starred}
+        {
+          \str_if_eq:nnTF { #2 } { description }
+            \ducklists@content@starred
+            \ducklists@content
+        }
+    \end{#2}
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ducklistlist}
+%    \begin{macrocode}
+\NewDocumentCommand \ducklistlist { s m }
+  {%>>>
+    \IfBooleanTF { #1 }
+      { \duckuments@listlist@starred { #2 } }
+      {
+        \str_if_eq:nnTF { #2 } { description }
+          { \duckuments@listlist@starred { description } }
+          { \duckuments@listlist{#2} }
+      }
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{\duckenumerate}
+%    \begin{macrocode}
+\newcommand*\duckenumerate{\ducklist{enumerate}}
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\duckitemize}
+%    \begin{macrocode}
+\newcommand*\duckitemize{\ducklist{itemize}}
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\duckdescription}
+%    \begin{macrocode}
+\newcommand*\duckdescription{\ducklist{description}}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckumentsCreateExampleFile}
+%    \begin{macrocode}
+\newcommand*\duckumentsCreateExampleFile
+  {%>>>
+    \iow_new:N \duckuments_example_file_iow
+    \iow_open:Nn \duckuments_example_file_iow { example-image-duck.tex }
+    \iow_now:Nn \duckuments_example_file_iow
+      { \documentclass[tikz,multi]{standalone} }
+    \iow_now:Nn \duckuments_example_file_iow
+      { \usepackage{tikzducks} }
+    \iow_now:Nn \duckuments_example_file_iow
+      { \usepackage{duckuments} }
+    \iow_now:Nn \duckuments_example_file_iow
+      { \begin{document} }
+    \iow_now:Nn \duckuments_example_file_iow
+      { \duckumentsDrawRandomDucks }
+    \iow_now:Nn \duckuments_example_file_iow
+      { \end{document} }
+    \iow_close:N \duckuments_example_file_iow
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckumentsDrawRandomDucks}
+%    \begin{macrocode}
+\newcommand*\duckumentsDrawRandomDucks
+  {%>>>
+    \foreach\x in {1,2,...,\duckuments@randoms}
+      {\begin{tikzpicture}
+        \draw[black,fill=gray!50] (0,0) rectangle (6,4);
+          \draw[gray,thin] (0,0) -- (6,4);
+          \draw[gray,thin] (0,4) -- (6,0);
+          \draw[gray,thin] (3,0) -- (3,4);
+          \draw[gray,thin] (0,2) -- (6,2);
+          \node at (3,2) {\tikz\randuck;};
+      \end{tikzpicture}}
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+% \subsubsection{Intern}
+%
+% \begin{macro}{\duckuments@headings}
+%    \begin{macrocode}
+\newcommand*\duckuments@headings[1]
+  {%>>>
+    \ifcase#1\relax
+      \expandafter\chapter
+    \or \expandafter\section
+    \or \expandafter\subsection
+    \or \expandafter\subsubsection
+    \or \expandafter\paragraph
+    \else \expandafter\@gobble
+    \fi
+    {\duckuments@headings@text{#1}}
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments@headings@level}
+%    \begin{macrocode}
+\newcommand*\duckuments@headings@level[1]
+  {%>>>
+    (
+    \ifcase#1
+      chapter
+    \or section
+    \or subsection
+    \or subsubsection
+    \or paragraph
+    \fi
+    )
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments@ifinline}
+%    \begin{macrocode}
+\newcommand*\duckuments@ifinline[2][]
+  { \bool_if:NTF \l_duckuments_math_inline_bool { #2 } { #1 } }
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments@ifdisplay}
+%    \begin{macrocode}
+\newcommand*\duckuments@ifdisplay[2][]
+  { \bool_if:NTF \l_duckuments_math_display_bool { #2 } { #1 } }
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments_list_example:n}
+%    \begin{macrocode}
+\cs_new_protected_nopar:Nn \duckuments_list_example:n
+  {%>>>
+    \subsection{Example\ for\ ducks\ (#1)}
+    \ducklist { #1 }
+    \subsubsection{Nested\ ducks}
+    \ducklistlist { #1 }
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments@enquote}
+%    \begin{macrocode}
+\newcommand*\duckuments@enquote [1]
+  {%>>>
+    \cs_if_exist_use:NTF
+      \enquote { #1 }
+      {``#1''}
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments_patch_includegraphics:}
+%    \begin{macrocode}
+\cs_new_protected_nopar:Nn \duckuments_patch_includegraphics:
+  {%>>>
+    \cs_if_exist:NT \includegraphics
+      {
+        \LetLtxMacro\duckuments@includegraphicsBAK\includegraphics
+        \RenewDocumentCommand \includegraphics
+          { >{\duckuments_starred:n}s O{} m }
+          {
+            \regex_match:NnTF \c_duckuments_regex { ##3 }
+              {
+                \duckuments@includegraphicsBAK##1
+                  [page=\int_rand:nn{1}{\duckuments@randoms},##2] { ##3 }
+              }
+              {
+                \duckuments@includegraphicsBAK##1[##2]{##3}
+              }
+          }
+      }
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments_starred:n}
+%    \begin{macrocode}
+\cs_new_protected:Nn \duckuments_starred:n
+  {%>>>
+    \IfBooleanTF { #1 }
+      { \def\ProcessedArgument{*} }
+      { \def\ProcessedArgument{} } 
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+%    \begin{macrocode}
+\ExplSyntaxOff
+%    \end{macrocode}
+%
+% \begin{macro}{\duckuments@blindduck@text}
+%    \begin{macrocode}
+\newcommand*\duckuments@blindduck@text
+  {%>>>
+    There once was a very smart but sadly blind duck. When it was still a small
+    duckling it was renowned for its good vision. But sadly as the duck grew
+    older it caught a sickness which caused its eyesight to worsen. It became so
+    bad, that the duck couldn't read the notes it once took containing much of
+    inline math\duckuments@ifinline{ just like its favoured equation: $d = u_c
+    \cdot k$}. Only displayed equations remained legible%
+    \duckuments@ifdisplay[.]{ so it could still read \begin{equation}d = r a^k
+    e\hbox{.}\end{equation}} That annoyed the smart duck, as it wasn't able to
+    do its research any longer. It called for its underduckling and said:
+    \duckuments@enquote{Go, find me the best eye ducktor there is. He shall
+    heal me from my disease!}%
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments@headings@text}
+%    \begin{macrocode}
+\newcommand*\duckuments@headings@text[1]
+  {A friendly duck at level #1 \duckuments@headings@level{#1}}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ducklists@content}
+%    \begin{macrocode}
+\newcommand*\ducklists@content
+  {%>>>
+    \item First swims father drake
+    \item Then floats mother duck
+    \item After her paddles baby duckling
+    \item And over there bathes uncle canard
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ducklists@content@starred}
+%    \begin{macrocode}
+\newcommand*\ducklists@content@starred
+  {%>>>
+    \item[drake] is the swimming father
+    \item[duck] is the floating mother
+    \item[duckling] is the paddling baby
+    \item[canard] is the bathing uncle
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments@listlist}
+%    \begin{macrocode}
+\newcommand*\duckuments@listlist[1]
+  {%>>>
+    \begin{#1}
+      \item swimming father drake
+        \begin{#1}
+          \item swimming father drake
+            \begin{#1}
+              \item swimming father drake
+                \begin{#1}
+                  \item swimming father drake
+                  \item floating mother duck
+                \end{#1}
+              \item floating mother duck
+            \end{#1}
+          \item floating mother duck
+        \end{#1}
+      \item floating mother duck
+    \end{#1}%
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\duckuments@listlist@starred}
+%    \begin{macrocode}
+\newcommand*\duckuments@listlist@starred[1]
+  {%>>>
+    \begin{#1}
+      \item[drake] is the swimming father
+        \begin{#1}
+          \item[drake] is the swimming father
+            \begin{#1}
+              \item[drake] is the swimming father
+                \begin{#1}
+                  \item[drake] is the swimming father
+                  \item[duck] is the floating mother
+                \end{#1}
+              \item[duck] is the floating mother
+            \end{#1}
+          \item[duck] is the floating mother
+        \end{#1}
+      \item[duck] is the floating mother
+    \end{#1}%
+  }%<<<
+%    \end{macrocode}
+% \end{macro}
+%
+%    \begin{macrocode}
+\endinput
+%    \end{macrocode}
+%
+% \end{implementation}
+%
+%    \begin{macrocode}
+%</pkg>
+%    \end{macrocode}
+%
+%^^A vim: fdm=marker foldmarker=>>>,<<<
-- 
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