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-% \iffalse meta-comment
-%<=*COPYRIGHT>
-%% Copyright (C) 2011-2018 by Martin Scharrer <martin@scharrer-online.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'.
-%%
-%% The Current Maintainer of this work is Martin Scharrer.
-%%
-%% This work consists of the files ifetex.dtx and ifetex.ins
-%% and the derived filebase ifetex.sty.
-%%
-%<=/COPYRIGHT>
-% \fi
-%
-% \iffalse
-%<*driver>
-\ProvidesFile{ifetex.dtx}[%
-%<=*DATE>
- 2018/03/31
-%<=/DATE>
-%<=*VERSION>
- v1.2a
-%<=/VERSION>
- Conditional to test for e-TeX]
-\documentclass{ydoc}
-\GetFileInfo{ifetex.dtx}
-\usepackage{ifetex}[\filedate]
-\EnableCrossrefs
-\CodelineIndex
-\RecordChanges
-\begin{document}
- \DocInput{\jobname.dtx}
- \PrintChanges
- \PrintIndex
-\end{document}
-%</driver>
-% \fi
-%
-% \CheckSum{73}
-%
-% \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 \~}
-%
-%
-% \changes{v1.0}{2011/10/31}{First version.}
-% \changes{v1.1}{2011/11/06}{Changes to manual, local declaration of \cs{ifetex}.}
-% \changes{v1.2}{2011/12/15}{Added \cs{NeedsETeX} \protect\LaTeX\ macro.}
-% \changes{v1.2a}{2018/03/31}{Improvements to manual.}
-%
-%
-% \DoNotIndex{\newcommand,\newenvironment}
-%
-% \GetFileInfo{ifetex.dtx}
-% \author{Martin Scharrer}
-% \email{martin@scharrer-online.de}
-%
-% \maketitle
-%
-% \providecommand\eTeX{$\epsilon$-\TeX}
-% \begin{abstract}\noindent
-% This small package provides the if-switch \Macro\ifetex which
-% indicated whether \eTeX\ is available or not.
-% \end{abstract}
-%
-% \smallskip
-% \begin{multicols}{2}
-% \setcounter{tocdepth}{2}
-% \tableofcontents
-% \end{multicols}
-%
-% \section*{Links}
-% This package is developed using an
-% \href{https://bitbucket.org/martin_scharrer/ifetex/downloads/}{Mercurial}
-% (HG) revision control repository on \href{https://bitbucket.org/}{Bitbucket.org}.
-% It is published on the \href{http://www.ctan.org/}{Comprehensive \TeX\ Archive Network} (CTAN)
-% and available with the main \TeX\ distributions \TeX Live and Mik\TeX.
-%
-% Bug reports and feature requests should be submitted using the issue tracker linked below.
-%
-% The following table lists the location of the package, its downloadable files, both on CTAN and
-% on the package website.
-%
-% \begin{center}\small
-% \begin{tabular}{ll}
-% \toprule
-% CTAN & \small\url{https://www.ctan.org/pkg/ifetex}\\
-% PDF Manual & \small\url{http://mirrors.ctan.org/macros/latex/contrib/ifetex/ifetex.pdf}\\
-% TDS ZIP & \small\url{http://mirrors.ctan.org/install/macros/latex/contrib/ifetex.tds.zip}\\
-% \midrule
-% Website & \small\url{https://bitbucket.org/martin_scharrer/ifetex/}\\
-% HG Repository & \small\url{https://bitbucket.org/martin_scharrer/ifetex/}\\
-% Issue Tracker & \small\url{https://bitbucket.org/martin_scharrer/ifetex/issues}\\
-% Downloads & \small\url{https://bitbucket.org/martin_scharrer/ifetex/downloads/}\\
-% PDF Manual & \small\url{https://bitbucket.org/martin_scharrer/ifetex/downloads/ifetex.pdf}\\
-% TDS ZIP & \small\url{https://bitbucket.org/martin_scharrer/ifetex/downloads/ifetex.tds.zip}\\
-% Source ZIP & \small\url{https://bitbucket.org/martin_scharrer/ifetex/downloads/ifetex.zip}\\
-% \bottomrule
-% \end{tabular}
-% \end{center}
-%
-%
-%
-% \clearpage
-% \section{Usage}
-% The package can be loaded as \LaTeX\ package using \Macro\usepackage{ifetex} or in plain\TeX\ using \Macro\input' ifetex'.
-% In both cases it aborts silently if the \Macro\ifetex macro is already defined.
-%
-% The package currently test if \Macro\eTeXversion is defined as a primitive and assumes \eTeX\ if so.
-%
-% Note that almost all modern \LaTeX\ distributions use \eTeX.
-% The two major distributions \TeX\ Live and Mik\TeX\ support it and use it by default (except for the classic |tex|).
-% The \LaTeX\ which comes with \emph{Scientific Work Place} by MacKichan seems to not support \eTeX\ yet.
-% Package authors can use this package to test for missing \eTeX\ and provide fall-back code.
-%
-% \DescribeMacro\ifetex
-% Equal to \Macro\iftrue if \eTeX\ support is present and \Macro\iffalse otherwise.
-%
-% \DescribeMacro\NeedsETeX[<version>]
-% The \LaTeX\ package provides this macro which can be used in packages or classes to produce an error if \eTeX\ is not available,
-% similar to \Macro\NeedsTeXFormat. In addition an optional version number can be given in the format x.y, where x is the main version and y the revision.
-% This number is checked against \Macro\eTeXversion and \Macro\eTeXrevision and an appropriate error is raised if the available
-% \eTeX\ is too old.
-%
-% \StopEventually{}
-% \clearpage
-% \section{Implementation}
-%
-% \subsection{\texttt{ifetex.sty}}
-% \iffalse
-%<*ifetex.sty>
-% \fi
-% \begin{macrocode}
-%<!COPYRIGHT>
-\ProvidesPackage{ifetex}[%
-%<!DATE>
-%<!VERSION>
-%<*DRIVER>
- 2099/01/01 develop
-%</DRIVER>
- ifetex]
-% \end{macrocode}
-%
-% \begin{macrocode}
-\@@input ifetex
-% \end{macrocode}
-%
-%
-% \begin{macro}{\NeedsETeX}[1]{optional version number (x.y)}
-% Produces error if e-TeX is not available or if its version is too old.
-% \begin{macrocode}
-\newcommand*\NeedsETeX[1][]{%
- \ifetex
- \ifx\@nnil#1\@nnil\else
- \ifdim\the\eTeXversion\eTeXrevision\p@<#1\p@\relax
- \@latex@error{This file needs e-TeX with version #1%
- \MessageBreak but only version \the\eTeXversion\eTeXrevision is available}{%
- The current input file will not be processed
- further,\MessageBreak
- because it was written for a newer version of e-TeX.
- \MessageBreak\@ehd}%
- \endinput
- \fi\fi
- \else
- \@latex@error{This file needs e-TeX}{%
- The current input file will not be processed
- further,\MessageBreak
- because it was written for e-TeX which is not available.
- \MessageBreak\@ehd}%
- \endinput
- \fi
-}
-% \end{macrocode}
-% \end{macro}
-%
-% \iffalse
-%</ifetex.sty>
-% \fi
-%
-% \subsection{\texttt{ifetex.tex}}
-% \iffalse
-%<*ifetex.tex>
-% \fi
-% \begin{macrocode}
-%<!COPYRIGHT>
-% \end{macrocode}
-%
-% Abort if \Macro{ifetex} is already defined.
-% \begin{macrocode}
-\expandafter\ifx\csname ifetex\endcsname\relax\else
- \expandafter\endinput
-\fi
-% \end{macrocode}
-%
-% \begin{macro}{ifetex}
-% Checks if \Macro\eTeXversion is a primitive.
-% \begin{macrocode}
-\begingroup
-\edef\tempa{\meaning\eTeXversion}%
-\edef\tempb{\string\eTeXversion}%
-\ifx\tempa\tempb
- \endgroup
- \expandafter\let\csname ifetex\expandafter\endcsname\csname iftrue\endcsname
-\else
- \endgroup
- \expandafter\let\csname ifetex\expandafter\endcsname\csname iffalse\endcsname
-\fi
-% \end{macrocode}
-% \end{macro}
-% \iffalse
-%</ifetex.tex>
-% \fi
-%
-% \Finale
-\endinput