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+% \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 ifluatex.dtx
+% and the derived files
+% ifluatex.sty, ifluatex.pdf, ifluatex.ins, ifluatex.drv,
+% ifluatex-test1.tex.
+%
+% Distribution:
+% CTAN:macros/latex/contrib/oberdiek/ifluatex.dtx
+% CTAN:macros/latex/contrib/oberdiek/ifluatex.pdf
+%
+% Unpacking:
+% (a) If ifluatex.ins is present:
+% tex ifluatex.ins
+% (b) Without ifluatex.ins:
+% tex ifluatex.dtx
+% (c) If you insist on using LaTeX
+% latex \let\install=y\input{ifluatex.dtx}
+% (quote the arguments according to the demands of your shell)
+%
+% Documentation:
+% (a) If ifluatex.drv is present:
+% latex ifluatex.drv
+% (b) Without ifluatex.drv:
+% latex ifluatex.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 ifluatex.dtx
+% makeindex -s gind.ist ifluatex.idx
+% pdflatex ifluatex.dtx
+% makeindex -s gind.ist ifluatex.idx
+% pdflatex ifluatex.dtx
+%
+% Installation:
+% TDS:tex/generic/oberdiek/ifluatex.sty
+% TDS:doc/latex/oberdiek/ifluatex.pdf
+% TDS:doc/latex/oberdiek/test/ifluatex-test1.tex
+% TDS:source/latex/oberdiek/ifluatex.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: ifluatex 2007/12/12 v1.0 Provides the ifluatex switch (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 ifluatex.dtx
+and the derived files
+ ifluatex.sty, ifluatex.pdf, ifluatex.ins, ifluatex.drv,
+ ifluatex-test1.tex.
+
+\endpreamble
+\let\MetaPrefix\DoubleperCent
+
+\generate{%
+ \file{ifluatex.ins}{\from{ifluatex.dtx}{install}}%
+ \file{ifluatex.drv}{\from{ifluatex.dtx}{driver}}%
+ \usedir{tex/generic/oberdiek}%
+ \file{ifluatex.sty}{\from{ifluatex.dtx}{package}}%
+ \usedir{doc/latex/oberdiek/test}%
+ \file{ifluatex-test1.tex}{\from{ifluatex.dtx}{test1}}%
+}
+
+\obeyspaces
+\Msg{************************************************************************}
+\Msg{*}
+\Msg{* To finish the installation you have to move the following}
+\Msg{* file into a directory searched by TeX:}
+\Msg{*}
+\Msg{* ifluatex.sty}
+\Msg{*}
+\Msg{* And install the following script file:}
+\Msg{*}
+\Msg{* }
+\Msg{*}
+\Msg{* To produce the documentation run the file `ifluatex.drv'}
+\Msg{* through LaTeX.}
+\Msg{*}
+\Msg{* Happy TeXing!}
+\Msg{*}
+\Msg{************************************************************************}
+
+\endbatchfile
+%</install>
+%<*ignore>
+\fi
+%</ignore>
+%<*driver>
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesFile{ifluatex.drv}%
+ [2007/12/12 v1.0 Provides the ifluatex switch (HO)]%
+\documentclass{ltxdoc}
+\usepackage{holtxdoc}[2007/11/11]
+\begin{document}
+ \DocInput{ifluatex.dtx}%
+\end{document}
+%</driver>
+% \fi
+%
+% \CheckSum{363}
+%
+% \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{ifluatex.drv}
+%
+% \title{The \xpackage{ifluatex} package}
+% \date{2007/12/12 v1.0}
+% \author{Heiko Oberdiek\\\xemail{oberdiek@uni-freiburg.de}}
+%
+% \maketitle
+%
+% \begin{abstract}
+% This package looks for \LuaTeX\ regardless of its mode
+% and provides the switch \cs{ifluatex}.
+% It works with \plainTeX\ or \LaTeX.
+% \end{abstract}
+%
+% \tableofcontents
+%
+% \section{Documentation}
+%
+% The package \xpackage{ifluatex} can be used with both \plainTeX\
+% and \LaTeX:
+% \begin{description}
+% \item[\plainTeX:] |\input ifluatex.sty|
+% \item[\LaTeXe:] |\usepackage{ifluatex}|
+% \end{description}
+%
+% \DescribeMacro{\ifluatex}
+% The package provides the switch \cs{ifluatex}:
+% \begin{quote}
+% |\ifluatex|\\
+% \hspace{1.5em}\LuaTeX\ is running\\
+% |\else|\\
+% \hspace{1.5em}Without \LuaTeX\\
+% |\fi|
+% \end{quote}
+%
+% If you want to detect the mode (DVI or PDF), then use package
+% \xpackage{ifpdf}. \LuaTeX\ has inherited \cs{pdfoutput} from \pdfTeX.
+%
+% \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@ifluatex.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{ifluatex}{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@ifluatex.sty\endcsname
+\ProvidesPackage{ifluatex}%
+ [2007/12/12 v1.0 Provides the ifluatex switch (HO)]
+% \end{macrocode}
+%
+% \subsection{Catcodes}
+%
+% \begin{macrocode}
+\begingroup
+ \catcode123 1 % {
+ \catcode125 2 % }
+ \def\x{\endgroup
+ \expandafter\edef\csname ifluatex@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\ifluatex@AtEnd{%
+ \ifluatex@AtEnd
+ \catcode#1 \the\catcode#1\relax
+ }%
+ \catcode#1 #2\relax
+}
+\TMP@EnsureCode{10}{12}% ^^J
+\TMP@EnsureCode{44}{12}% ,
+\TMP@EnsureCode{45}{12}% -
+\TMP@EnsureCode{46}{12}% .
+\TMP@EnsureCode{47}{12}% /
+\TMP@EnsureCode{58}{12}% :
+\TMP@EnsureCode{61}{12}% =
+\TMP@EnsureCode{94}{7}% ^
+% \end{macrocode}
+%
+% \subsection{Check for previously defined \cs{ifluatex}}
+%
+% \begin{macrocode}
+\begingroup
+ \expandafter\ifx\csname ifluatex\endcsname\relax
+ \else
+ \edef\i/{\expandafter\string\csname ifluatex\endcsname}%
+ \expandafter\ifx\csname PackageError\endcsname\relax
+ \def\x#1#2{%
+ \edef\z{#2}%
+ \expandafter\errhelp\expandafter{\z}%
+ \errmessage{Package ifluatex Error: #1}%
+ }%
+ \def\y{^^J}%
+ \newlinechar=10 %
+ \else
+ \def\x#1#2{%
+ \PackageError{ifluatex}{#1}{#2}%
+ }%
+ \def\y{\MessageBreak}%
+ \fi
+ \x{Name clash, \i/ is already defined}{%
+ Incompatible versions of \i/ can cause problems,\y
+ therefore package loading is aborted.%
+ }%
+ \endgroup
+ \ifluatex@AtEnd
+ \expandafter\endinput
+ \fi
+\endgroup
+% \end{macrocode}
+%
+% \subsection{\cs{ifluatex}}
+%
+% \begin{macro}{\ifluatex}
+% Create and set the switch. \cs{newif} initializes the
+% switch with \cs{iffalse}.
+% \begin{macrocode}
+\newif\ifluatex
+% \end{macrocode}
+% Test \cs{pdfoutput}. Is it defined and different from
+% \cs{relax}? Someone could have used \LaTeX\ internal
+% \cs{@ifundefined}, or something else involving.
+% Notice, \cs{csname} is executed inside a group for the test
+% to cancel the side effect of \cs{csname}.
+% \begin{macrocode}
+\begingroup\expandafter\expandafter\expandafter\endgroup
+\expandafter\ifx\csname luatexversion\endcsname\relax
+\else
+ \luatextrue
+\fi
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Protocol entry}
+%
+% Log comment:
+% \begin{macrocode}
+\begingroup
+ \expandafter\ifx\csname PackageInfo\endcsname\relax
+ \def\x#1#2{%
+ \immediate\write-1{Package #1 Info: #2.}%
+ }%
+ \else
+ \let\x\PackageInfo
+ \expandafter\let\csname on@line\endcsname\empty
+ \fi
+ \x{ifluatex}{LuaTeX \ifluatex\else not \fi detected}%
+\endgroup
+% \end{macrocode}
+% \begin{macrocode}
+\ifluatex@AtEnd
+% \end{macrocode}
+% \begin{macrocode}
+%</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 ifluatex.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}
+%
+% \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/ifluatex.dtx}] The source file.
+% \item[\CTAN{macros/latex/contrib/oberdiek/ifluatex.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{macros/latex/contrib/oberdiek/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 ifluatex.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@{}}
+% ifluatex.sty & tex/generic/oberdiek/ifluatex.sty\\
+% ifluatex.pdf & doc/latex/oberdiek/ifluatex.pdf\\
+% test/ifluatex-test1.tex & doc/latex/oberdiek/test/ifluatex-test1.tex\\
+% ifluatex.dtx & source/latex/oberdiek/ifluatex.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 ifluatex.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{ifluatex.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 ifluatex.dtx
+%makeindex -s gind.ist ifluatex.idx
+%pdflatex ifluatex.dtx
+%makeindex -s gind.ist ifluatex.idx
+%pdflatex ifluatex.dtx
+%\end{verbatim}
+% \end{quote}
+%
+% \begin{History}
+% \begin{Version}{2007/12/12 v1.0}
+% \item
+% First public version.
+% \end{Version}
+% \end{History}
+%
+% \PrintIndex
+%
+% \Finale
+\endinput