path: root/Master/texmf-dist/source/latex/oberdiek/etexcmds.dtx

% \iffalse meta-comment
%
% Copyright (C) 2007 by Heiko Oberdiek <oberdiek@uni-freiburg.de>
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either
% version 1.3 of this license or (at your option) any later
% version. The latest version of this license is in
%    http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of
% LaTeX version 2005/12/01 or later.
%
% This work has the LPPL maintenance status "maintained".
%
% This Current Maintainer of this work is Heiko Oberdiek.
%
% This work consists of the main source file etexcmds.dtx
% and the derived files
%    etexcmds.sty, etexcmds.pdf, etexcmds.ins, etexcmds.drv,
%    etexcmds-test1.tex, etexcmds-test2.tex, etexcmds-test3.tex,
%    etexcmds-test4.tex.
%
% Distribution:
%    CTAN:macros/latex/contrib/oberdiek/etexcmds.dtx
%    CTAN:macros/latex/contrib/oberdiek/etexcmds.pdf
%
% Unpacking:
%    (a) If etexcmds.ins is present:
%           tex etexcmds.ins
%    (b) Without etexcmds.ins:
%           tex etexcmds.dtx
%    (c) If you insist on using LaTeX
%           latex \let\install=y\input{etexcmds.dtx}
%        (quote the arguments according to the demands of your shell)
%
% Documentation:
%    (a) If etexcmds.drv is present:
%           latex etexcmds.drv
%    (b) Without etexcmds.drv:
%           latex etexcmds.dtx; ...
%    The class ltxdoc loads the configuration file ltxdoc.cfg
%    if available. Here you can specify further options, e.g.
%    use A4 as paper format:
%       \PassOptionsToClass{a4paper}{article}
%
%    Programm calls to get the documentation (example):
%       pdflatex etexcmds.dtx
%       makeindex -s gind.ist etexcmds.idx
%       pdflatex etexcmds.dtx
%       makeindex -s gind.ist etexcmds.idx
%       pdflatex etexcmds.dtx
%
% Installation:
%    TDS:tex/generic/oberdiek/etexcmds.sty
%    TDS:doc/latex/oberdiek/etexcmds.pdf
%    TDS:doc/latex/oberdiek/test/etexcmds-test1.tex
%    TDS:doc/latex/oberdiek/test/etexcmds-test2.tex
%    TDS:doc/latex/oberdiek/test/etexcmds-test3.tex
%    TDS:doc/latex/oberdiek/test/etexcmds-test4.tex
%    TDS:source/latex/oberdiek/etexcmds.dtx
%
%<*ignore>
\begingroup
  \def\x{LaTeX2e}%
\expandafter\endgroup
\ifcase 0\ifx\install y1\fi\expandafter
         \ifx\csname processbatchFile\endcsname\relax\else1\fi
         \ifx\fmtname\x\else 1\fi\relax
\else\csname fi\endcsname
%</ignore>
%<*install>
\input docstrip.tex
\Msg{************************************************************************}
\Msg{* Installation}
\Msg{* Package: etexcmds 2007/12/12 v1.2 Prefix for e-TeX command names (HO)}
\Msg{************************************************************************}

\keepsilent
\askforoverwritefalse

\let\MetaPrefix\relax
\preamble

This is a generated file.

Copyright (C) 2007 by Heiko Oberdiek <oberdiek@uni-freiburg.de>

This work may be distributed and/or modified under the
conditions of the LaTeX Project Public License, either
version 1.3 of this license or (at your option) any later
version. The latest version of this license is in
   http://www.latex-project.org/lppl.txt
and version 1.3 or later is part of all distributions of
LaTeX version 2005/12/01 or later.

This work has the LPPL maintenance status "maintained".

This Current Maintainer of this work is Heiko Oberdiek.

This work consists of the main source file etexcmds.dtx
and the derived files
   etexcmds.sty, etexcmds.pdf, etexcmds.ins, etexcmds.drv,
   etexcmds-test1.tex, etexcmds-test2.tex, etexcmds-test3.tex,
   etexcmds-test4.tex.

\endpreamble
\let\MetaPrefix\DoubleperCent

\generate{%
  \file{etexcmds.ins}{\from{etexcmds.dtx}{install}}%
  \file{etexcmds.drv}{\from{etexcmds.dtx}{driver}}%
  \usedir{tex/generic/oberdiek}%
  \file{etexcmds.sty}{\from{etexcmds.dtx}{package}}%
  \usedir{doc/latex/oberdiek/test}%
  \file{etexcmds-test1.tex}{\from{etexcmds.dtx}{test1}}%
  \file{etexcmds-test2.tex}{\from{etexcmds.dtx}{test2}}%
  \file{etexcmds-test3.tex}{\from{etexcmds.dtx}{test3}}%
  \file{etexcmds-test4.tex}{\from{etexcmds.dtx}{test4}}%
}

\obeyspaces
\Msg{************************************************************************}
\Msg{*}
\Msg{* To finish the installation you have to move the following}
\Msg{* file into a directory searched by TeX:}
\Msg{*}
\Msg{*     etexcmds.sty}
\Msg{*}
\Msg{* And install the following script file:}
\Msg{*}
\Msg{*     }
\Msg{*}
\Msg{* To produce the documentation run the file `etexcmds.drv'}
\Msg{* through LaTeX.}
\Msg{*}
\Msg{* Happy TeXing!}
\Msg{*}
\Msg{************************************************************************}

\endbatchfile
%</install>
%<*ignore>
\fi
%</ignore>
%<*driver>
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile{etexcmds.drv}%
  [2007/12/12 v1.2 Prefix for e-TeX command names (HO)]%
\documentclass{ltxdoc}
\usepackage{holtxdoc}[2008/08/11]
\begin{document}
  \DocInput{etexcmds.dtx}%
\end{document}
%</driver>
% \fi
%
% \CheckSum{479}
%
% \CharacterTable
%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%   Digits        \0\1\2\3\4\5\6\7\8\9
%   Exclamation   \!     Double quote  \"     Hash (number) \#
%   Dollar        \$     Percent       \%     Ampersand     \&
%   Acute accent  \'     Left paren    \(     Right paren   \)
%   Asterisk      \*     Plus          \+     Comma         \,
%   Minus         \-     Point         \.     Solidus       \/
%   Colon         \:     Semicolon     \;     Less than     \<
%   Equals        \=     Greater than  \>     Question mark \?
%   Commercial at \@     Left bracket  \[     Backslash     \\
%   Right bracket \]     Circumflex    \^     Underscore    \_
%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%   Right brace   \}     Tilde         \~}
%
% \GetFileInfo{etexcmds.drv}
%
% \title{The \xpackage{etexcmds} package}
% \date{2007/12/12 v1.2}
% \author{Heiko Oberdiek\\\xemail{oberdiek@uni-freiburg.de}}
%
% \maketitle
%
% \begin{abstract}
% New primitive commands are introduced in \eTeX. Sometimes the
% names collide with existing macros. This package solves this
% name clashes by adding a prefix to \eTeX's commands. For example,
% \eTeX's \cs{unexpanded} is provided as \cs{etex@unexpanded}.
% \end{abstract}
%
% \tableofcontents
%
% \section{Documentation}
%
% \subsection{\cs{unexpanded}}
%
% \begin{declcs}{etex@unexpanded}
% \end{declcs}
% New primitive commands are introduced in \eTeX. Unhappily
% \cs{unexpanded} collides with a macro in Con\TeX t with the
% same name. This also affects the \LaTeX\ world. For example,
% package \xpackage{m-ch-de} loads \xfile{base/syst-gen.tex}
% that redefines \cs{unexpanded}. Thus this package defines
% \cs{etex@unexpanded} to get rid of the name clash.
%
% \begin{declcs}{ifetex@unexpanded}
% \end{declcs}
% Package \xpackage{etexcmds} can be loaded even if \eTeX\ is not
% present or \cs{unexpanded} cannot be found. The switch
% \cs{ifetex@unexpanded} tells whether it is safe to use
% \cs{etex@unexpanded}.
% The switch is true (\cs{iftrue}) only if the
% primitive \cs{unexpanded} has been found and \cs{etex@unexpanded}
% is available.
%
% \subsection{\cs{expanded}}
%
% Probably \cs{expanded} will be added in \pdfTeX\ 1.50.4 and
% \LuaTeX. Again Con\TeX t defines this as macro.
% Therefore version 1.2 of this packages also provides
% \cs{etex@expanded} and \cs{ifetex@unexpanded}.
%
% \StopEventually{
% }
%
% \section{Implementation}
%
%    \begin{macrocode}
%<*package>
%    \end{macrocode}
%
% \subsection{Reload check and package identification}
%    Reload check, especially if the package is not used with \LaTeX.
%    \begin{macrocode}
\begingroup
  \catcode44 12 % ,
  \catcode45 12 % -
  \catcode46 12 % .
  \catcode58 12 % :
  \catcode64 11 % @
  \expandafter\let\expandafter\x\csname ver@etexcmds.sty\endcsname
  \ifcase 0%
    \ifx\x\relax % plain
    \else
      \ifx\x\empty % LaTeX
      \else
        1%
      \fi
    \fi
  \else
    \catcode35 6 % #
    \catcode123 1 % {
    \catcode125 2 % }
    \expandafter\ifx\csname PackageInfo\endcsname\relax
      \def\x#1#2{%
        \immediate\write-1{Package #1 Info: #2.}%
      }%
    \else
      \def\x#1#2{\PackageInfo{#1}{#2, stopped}}%
    \fi
    \x{etexcmds}{The package is already loaded}%
    \endgroup
    \expandafter\endinput
  \fi
\endgroup
%    \end{macrocode}
%    Package identification:
%    \begin{macrocode}
\begingroup
  \catcode35 6 % #
  \catcode40 12 % (
  \catcode41 12 % )
  \catcode44 12 % ,
  \catcode45 12 % -
  \catcode46 12 % .
  \catcode47 12 % /
  \catcode58 12 % :
  \catcode64 11 % @
  \catcode123 1 % {
  \catcode125 2 % }
  \expandafter\ifx\csname ProvidesPackage\endcsname\relax
    \def\x#1#2#3[#4]{\endgroup
      \immediate\write-1{Package: #3 #4}%
      \xdef#1{#4}%
    }%
  \else
    \def\x#1#2[#3]{\endgroup
      #2[{#3}]%
      \ifx#1\relax
        \xdef#1{#3}%
      \fi
    }%
  \fi
\expandafter\x\csname ver@etexcmds.sty\endcsname
\ProvidesPackage{etexcmds}%
  [2007/12/12 v1.2 Prefix for e-TeX command names (HO)]
%    \end{macrocode}
%
% \subsection{Catcodes}
%
%    \begin{macrocode}
\begingroup
  \catcode123 1 % {
  \catcode125 2 % }
  \def\x{\endgroup
    \expandafter\edef\csname etexcmds@AtEnd\endcsname{%
      \catcode35 \the\catcode35\relax
      \catcode64 \the\catcode64\relax
      \catcode123 \the\catcode123\relax
      \catcode125 \the\catcode125\relax
    }%
  }%
\x
\catcode35 6 % #
\catcode64 11 % @
\catcode123 1 % {
\catcode125 2 % }
\def\TMP@EnsureCode#1#2{%
  \edef\etexcmds@AtEnd{%
    \etexcmds@AtEnd
    \catcode#1 \the\catcode#1\relax
  }%
  \catcode#1 #2\relax
}
\TMP@EnsureCode{44}{12}% ,
\TMP@EnsureCode{45}{12}% -
\TMP@EnsureCode{46}{12}% .
\TMP@EnsureCode{47}{12}% /
\TMP@EnsureCode{61}{12}% =
\edef\etexcmds@AtEnd{%
  \etexcmds@AtEnd
  \escapechar\the\escapechar\relax
}
\escapechar=92 % backslash
%    \end{macrocode}
%
% \subsection{Load package \xpackage{infwarerr}}
%
%    \begin{macrocode}
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname RequirePackage\endcsname\relax
  \input infwarerr.sty\relax
\else
  \RequirePackage{infwarerr}[2007/09/09]%
\fi
%    \end{macrocode}
%
% \subsection{\cs{unexpanded}}
%
%    \begin{macro}{\ifetex@unexpanded}
%    \begin{macrocode}
\newif\ifetex@unexpanded
%    \end{macrocode}
%    \end{macro}
%
%    \begin{macro}{\etex@unexpanded}
%    \begin{macrocode}
\begingroup
\edef\x{\string\unexpanded}%
\edef\y{\meaning\unexpanded}%
\ifx\x\y
  \endgroup
  \let\etex@unexpanded\unexpanded
  \etex@unexpandedtrue
\else
  \edef\y{\meaning\normalunexpanded}%
  \ifx\x\y
    \endgroup
    \let\etex@unexpanded\normalunexpanded
    \etex@unexpandedtrue
  \else
    \edef\y{\meaning\@@unexpanded}%
    \ifx\y
      \endgroup
      \let\etex@unexpanded\@@unexpanded
      \etex@unexpandedtrue
    \else
      \endgroup
      \@PackageInfoNoLine{etexcmds}{%
        Could not find \string\unexpanded.\MessageBreak
        That can mean that you are not using e-TeX or\MessageBreak
        that some package has redefined \string\unexpanded.\MessageBreak
        In the latter case, load this package earlier%
      }%
      \etex@unexpandedfalse
    \fi
  \fi
\fi
%    \end{macrocode}
%    \end{macro}
%
% \subsection{\cs{expanded}}
%
%    \begin{macro}{\ifetex@expanded}
%    \begin{macrocode}
\newif\ifetex@expanded
%    \end{macrocode}
%    \end{macro}
%
%    \begin{macro}{\etex@expanded}
%    \begin{macrocode}
\begingroup
\edef\x{\string\expanded}%
\edef\y{\meaning\expanded}%
\ifx\x\y
  \endgroup
  \let\etex@expanded\expanded
  \etex@expandedtrue
\else
  \edef\y{\meaning\normalexpanded}%
  \ifx\x\y
    \endgroup
    \let\etex@expanded\normalexpanded
    \etex@expandedtrue
  \else
    \edef\y{\meaning\@@expanded}%
    \ifx\y
      \endgroup
      \let\etex@expanded\@@expanded
      \etex@expandedtrue
    \else
      \endgroup
      \@PackageInfoNoLine{etexcmds}{%
        Could not find \string\expanded.\MessageBreak
        That can mean that you are not using pdfTeX 1.50 or\MessageBreak
        that some package has redefined \string\expanded.\MessageBreak
        In the latter case, load this package earlier%
      }%
      \etex@expandedfalse
    \fi
  \fi
\fi
%    \end{macrocode}
%    \end{macro}
%
%    \begin{macrocode}
\etexcmds@AtEnd
%</package>
%    \end{macrocode}
%
% \section{Test}
%
% \subsection{Catcode checks for loading}
%
%    \begin{macrocode}
%<*test1>
%    \end{macrocode}
%    \begin{macrocode}
\catcode`\{=1 %
\catcode`\}=2 %
\catcode`\#=6 %
\catcode`\@=11 %
\expandafter\ifx\csname count@\endcsname\relax
  \countdef\count@=255 %
\fi
\expandafter\ifx\csname @gobble\endcsname\relax
  \long\def\@gobble#1{}%
\fi
\expandafter\ifx\csname @firstofone\endcsname\relax
  \long\def\@firstofone#1{#1}%
\fi
\expandafter\ifx\csname loop\endcsname\relax
  \expandafter\@firstofone
\else
  \expandafter\@gobble
\fi
{%
  \def\loop#1\repeat{%
    \def\body{#1}%
    \iterate
  }%
  \def\iterate{%
    \body
      \let\next\iterate
    \else
      \let\next\relax
    \fi
    \next
  }%
  \let\repeat=\fi
}%
\def\RestoreCatcodes{}
\count@=0 %
\loop
  \edef\RestoreCatcodes{%
    \RestoreCatcodes
    \catcode\the\count@=\the\catcode\count@\relax
  }%
\ifnum\count@<255 %
  \advance\count@ 1 %
\repeat

\def\RangeCatcodeInvalid#1#2{%
  \count@=#1\relax
  \loop
    \catcode\count@=15 %
  \ifnum\count@<#2\relax
    \advance\count@ 1 %
  \repeat
}
\expandafter\ifx\csname LoadCommand\endcsname\relax
  \def\LoadCommand{\input etexcmds.sty\relax}%
\fi
\def\Test{%
  \RangeCatcodeInvalid{0}{47}%
  \RangeCatcodeInvalid{58}{64}%
  \RangeCatcodeInvalid{91}{96}%
  \RangeCatcodeInvalid{123}{255}%
  \catcode`\@=12 %
  \catcode`\\=0 %
  \catcode`\{=1 %
  \catcode`\}=2 %
  \catcode`\#=6 %
  \catcode`\[=12 %
  \catcode`\]=12 %
  \catcode`\%=14 %
  \catcode`\ =10 %
  \catcode13=5 %
  \LoadCommand
  \RestoreCatcodes
}
\Test
\csname @@end\endcsname
\end
%    \end{macrocode}
%    \begin{macrocode}
%</test1>
%    \end{macrocode}
%
% \subsection{Macro tests}
%
%    \begin{macrocode}
%<*test2>
\immediate\write16{etexcmds-test2.tex: test file for plainTeX}
\input etexcmds.sty\relax
\catcode`\@=11 %
\edef\x{\string\unexpanded}
\edef\y{\meaning\etex@unexpanded}
\ifx\x\y
\else
  \@PackageError{etexcmds-test2}{Test failed}\@ehc
\fi
\end
%</test2>
%    \end{macrocode}
%
%    \begin{macrocode}
%<*test3>
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile{etexcmds-test3.tex}[2007/12/12 v1.2 Test file for LaTeX]
\RequirePackage{etexcmds}
\makeatletter
\edef\x{\string\unexpanded}
\edef\y{\meaning\etex@unexpanded}
\ifx\x\y
\else
  \@PackageError{etexcmds-test3}{Test failed}\@ehc
\fi
\stop
%</test3>
%    \end{macrocode}
%
%    \begin{macrocode}
%<*test4>
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile{etexcmds-test4.tex}[2007/12/12 v1.2 Test file for LaTeX]
\documentclass{article}
\usepackage{m-pictex}
\usepackage{m-ch-de}
\usepackage{etexcmds}
\makeatletter
\ifetex@unexpanded
  \edef\x{\string\unexpanded}%
  \edef\y{\meaning\etex@unexpanded}%
  \ifx\x\y
  \else
    \@PackageWarningNoLine{etexcmds-test4}{Test failed}%
  \fi
\else
  \@PackageWarningNoLine{etexcmds-test4}{%
    Test failed because of ConTeXt%
  }%
\fi
\stop
%</test4>
%    \end{macrocode}
%
% \section{Installation}
%
% \subsection{Download}
%
% \paragraph{Package.} This package is available on
% CTAN\footnote{\url{ftp://ftp.ctan.org/tex-archive/}}:
% \begin{description}
% \item[\CTAN{macros/latex/contrib/oberdiek/etexcmds.dtx}] The source file.
% \item[\CTAN{macros/latex/contrib/oberdiek/etexcmds.pdf}] Documentation.
% \end{description}
%
%
% \paragraph{Bundle.} All the packages of the bundle `oberdiek'
% are also available in a TDS compliant ZIP archive. There
% the packages are already unpacked and the documentation files
% are generated. The files and directories obey the TDS standard.
% \begin{description}
% \item[\CTAN{install/macros/latex/contrib/oberdiek.tds.zip}]
% \end{description}
% \emph{TDS} refers to the standard ``A Directory Structure
% for \TeX\ Files'' (\CTAN{tds/tds.pdf}). Directories
% with \xfile{texmf} in their name are usually organized this way.
%
% \subsection{Bundle installation}
%
% \paragraph{Unpacking.} Unpack the \xfile{oberdiek.tds.zip} in the
% TDS tree (also known as \xfile{texmf} tree) of your choice.
% Example (linux):
% \begin{quote}
%   |unzip oberdiek.tds.zip -d ~/texmf|
% \end{quote}
%
% \paragraph{Script installation.}
% Check the directory \xfile{TDS:scripts/oberdiek/} for
% scripts that need further installation steps.
% Package \xpackage{attachfile2} comes with the Perl script
% \xfile{pdfatfi.pl} that should be installed in such a way
% that it can be called as \texttt{pdfatfi}.
% Example (linux):
% \begin{quote}
%   |chmod +x scripts/oberdiek/pdfatfi.pl|\\
%   |cp scripts/oberdiek/pdfatfi.pl /usr/local/bin/|
% \end{quote}
%
% \subsection{Package installation}
%
% \paragraph{Unpacking.} The \xfile{.dtx} file is a self-extracting
% \docstrip\ archive. The files are extracted by running the
% \xfile{.dtx} through \plainTeX:
% \begin{quote}
%   \verb|tex etexcmds.dtx|
% \end{quote}
%
% \paragraph{TDS.} Now the different files must be moved into
% the different directories in your installation TDS tree
% (also known as \xfile{texmf} tree):
% \begin{quote}
% \def\t{^^A
% \begin{tabular}{@{}>{\ttfamily}l@{ $\rightarrow$ }>{\ttfamily}l@{}}
%   etexcmds.sty & tex/generic/oberdiek/etexcmds.sty\\
%   etexcmds.pdf & doc/latex/oberdiek/etexcmds.pdf\\
%   test/etexcmds-test1.tex & doc/latex/oberdiek/test/etexcmds-test1.tex\\
%   test/etexcmds-test2.tex & doc/latex/oberdiek/test/etexcmds-test2.tex\\
%   test/etexcmds-test3.tex & doc/latex/oberdiek/test/etexcmds-test3.tex\\
%   test/etexcmds-test4.tex & doc/latex/oberdiek/test/etexcmds-test4.tex\\
%   etexcmds.dtx & source/latex/oberdiek/etexcmds.dtx\\
% \end{tabular}^^A
% }^^A
% \sbox0{\t}^^A
% \ifdim\wd0>\linewidth
%   \begingroup
%     \advance\linewidth by\leftmargin
%     \advance\linewidth by\rightmargin
%   \edef\x{\endgroup
%     \def\noexpand\lw{\the\linewidth}^^A
%   }\x
%   \def\lwbox{^^A
%     \leavevmode
%     \hbox to \linewidth{^^A
%       \kern-\leftmargin\relax
%       \hss
%       \usebox0
%       \hss
%       \kern-\rightmargin\relax
%     }^^A
%   }^^A
%   \ifdim\wd0>\lw
%     \sbox0{\small\t}^^A
%     \ifdim\wd0>\linewidth
%       \ifdim\wd0>\lw
%         \sbox0{\footnotesize\t}^^A
%         \ifdim\wd0>\linewidth
%           \ifdim\wd0>\lw
%             \sbox0{\scriptsize\t}^^A
%             \ifdim\wd0>\linewidth
%               \ifdim\wd0>\lw
%                 \sbox0{\tiny\t}^^A
%                 \ifdim\wd0>\linewidth
%                   \lwbox
%                 \else
%                   \usebox0
%                 \fi
%               \else
%                 \lwbox
%               \fi
%             \else
%               \usebox0
%             \fi
%           \else
%             \lwbox
%           \fi
%         \else
%           \usebox0
%         \fi
%       \else
%         \lwbox
%       \fi
%     \else
%       \usebox0
%     \fi
%   \else
%     \lwbox
%   \fi
% \else
%   \usebox0
% \fi
% \end{quote}
% If you have a \xfile{docstrip.cfg} that configures and enables \docstrip's
% TDS installing feature, then some files can already be in the right
% place, see the documentation of \docstrip.
%
% \subsection{Refresh file name databases}
%
% If your \TeX~distribution
% (\teTeX, \mikTeX, \dots) relies on file name databases, you must refresh
% these. For example, \teTeX\ users run \verb|texhash| or
% \verb|mktexlsr|.
%
% \subsection{Some details for the interested}
%
% \paragraph{Attached source.}
%
% The PDF documentation on CTAN also includes the
% \xfile{.dtx} source file. It can be extracted by
% AcrobatReader 6 or higher. Another option is \textsf{pdftk},
% e.g. unpack the file into the current directory:
% \begin{quote}
%   \verb|pdftk etexcmds.pdf unpack_files output .|
% \end{quote}
%
% \paragraph{Unpacking with \LaTeX.}
% The \xfile{.dtx} chooses its action depending on the format:
% \begin{description}
% \item[\plainTeX:] Run \docstrip\ and extract the files.
% \item[\LaTeX:] Generate the documentation.
% \end{description}
% If you insist on using \LaTeX\ for \docstrip\ (really,
% \docstrip\ does not need \LaTeX), then inform the autodetect routine
% about your intention:
% \begin{quote}
%   \verb|latex \let\install=y\input{etexcmds.dtx}|
% \end{quote}
% Do not forget to quote the argument according to the demands
% of your shell.
%
% \paragraph{Generating the documentation.}
% You can use both the \xfile{.dtx} or the \xfile{.drv} to generate
% the documentation. The process can be configured by the
% configuration file \xfile{ltxdoc.cfg}. For instance, put this
% line into this file, if you want to have A4 as paper format:
% \begin{quote}
%   \verb|\PassOptionsToClass{a4paper}{article}|
% \end{quote}
% An example follows how to generate the
% documentation with pdf\LaTeX:
% \begin{quote}
%\begin{verbatim}
%pdflatex etexcmds.dtx
%makeindex -s gind.ist etexcmds.idx
%pdflatex etexcmds.dtx
%makeindex -s gind.ist etexcmds.idx
%pdflatex etexcmds.dtx
%\end{verbatim}
% \end{quote}
%
% \begin{History}
%   \begin{Version}{2007/05/06 v1.0}
%   \item
%     First version.
%   \end{Version}
%   \begin{Version}{2007/09/09 v1.1}
%   \item
%     Documentation for \cs{ifetex@unexpanded} added.
%   \item
%     Catcode section rewritten.
%   \end{Version}
%   \begin{Version}{2007/12/12 v1.2}
%   \item
%     \cs{etex@expanded} added.
%   \end{Version}
% \end{History}
%
% \PrintIndex
%
% \Finale
\endinput