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-% File: ifvtex.sty
-% Version: 2001/09/26 v1.0
-% Author: Heiko Oberdiek
-% Email: <oberdiek@uni-freiburg.de>
-%
-% Copyright: Copyright (C) 2001 Heiko Oberdiek.
-%
-% This program may be distributed and/or modified under
-% the conditions of the LaTeX Project Public License,
-% either version 1.2 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 1.2 or later is part of all distributions
-% of LaTeX version 1999/12/01 or later.
-%
-% Function: This package looks for VTeX and implements
-% and sets the switches \ifvtex, \ifvtex<mode>,
-% and \ifvtexgex.
-% It works with plain or LaTeX formats.
-%
-% Use: LaTeX: \usepackage{ifvtex}
-% plain: \input ifvtex.sty
-% The package provides the switch \ifvtex:
-% \ifvtex
-% ... do things, if VTeX is running ...
-% \else
-% ... other TeX ...
-% \fi
-% The package can also be used to set global
-% documentclass options:
-% \RequirePackage{ifvtex}
-% \ifvtex
-% \documentclass[vtex,...]{...}
-% \else
-% \documentclass[...]{...}
-% \fi
-%
-% For the different output modes the following switches
-% can be used:
-% \ifvtexdvi, \ifvtexpdf, \ifvtexps, \ifvtexhtml
-% And for GeX mode:
-% \ifvtexgex
-%
-% For detecting VTeX \VTeXversion and \OpMode
-% has to be defined. The modes are detected by
-% \OpMode and GeX by \gexmode.
-%
-% History: 2001/09/26 v1.0:
-% * first public version,
-%
-% Prevent reloading more than one:
-\begingroup
- \expandafter\let\expandafter\x\csname ver@ifvtex.sty\endcsname
- \ifcase 0%
- \ifx\x\relax % plain
- \else
- \ifx\x\empty % LaTeX
- \else
- 1%
- \fi
- \fi
- \else
- \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{ifvtex}{The package is already loaded}%
- \endgroup
- \expandafter\endinput
- \fi
-\endgroup
-%
-% Package identification:
-\begingroup
- \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@ifvtex.sty\endcsname
-\ProvidesPackage{ifvtex}%
- [2001/06/14 v1.0 *TEST* Providing %
- \expandafter\string\csname ifvtex\endcsname\space switches (HO)]
-%
-% Check, whether \ifvtex is already defined:
-\begingroup
- \expandafter\ifx\csname ifvtex\endcsname\relax
- \else
- \edef\i/{\expandafter\string\csname ifvtex\endcsname}%
- \expandafter\ifx\csname PackageError\endcsname\relax
- \def\x#1#2{%
- \edef\z{#2}%
- \expandafter\errhelp\expandafter{\z}%
- \errmessage{Package ifvtex Error: #1}%
- }%
- \def\y{^^J}%
- \newlinechar=10
- \else
- \def\x#1#2{%
- \PackageError{ifvtex}{#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
- \expandafter\endinput
- \fi
-\endgroup
-%
-% Implementing the switch \ifvtex:
-\newif\ifvtex
-\ifx\VTeXversion\undefined
-\else
- \ifx\VTeXversion\relax
- \else
- \ifx\OpMode\undefined
- \else
- \ifx\OpMode\relax
- \else
- \vtextrue
- \fi
- \fi
- \fi
-\fi
-%
-% Implementing the mode and GeX switches:
-\newif\ifvtexdvi
-\newif\ifvtexpdf
-\newif\ifvtexps
-\newif\ifvtexhtml
-\newif\ifvtexgex
-\ifvtex
- \ifcase\OpMode\relax
- \vtexdvitrue
- \or % 1
- \vtexpdftrue
- \or % 2
- \vtexpstrue
- \or % 3
- \vtexpstrue
- \or\or\or\or\or\or\or % 10
- \vtexhtmltrue
- \fi
- \ifx\gexmode\undefined
- \else
- \ifx\gexmode\relax
- \else
- \ifnum\gexmode>0 %
- \vtexgextrue
- \fi
- \fi
- \fi
-\fi
-%
-% Log comment:
-\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{ifvtex}{%
- VTeX %
- \ifvtex
- in \ifvtexdvi DVI\fi
- \ifvtexpdf PDF\fi
- \ifvtexps PS\fi
- \ifvtexhtml HTML\fi
- \space mode %
- with\ifvtexgex\else out\fi\space GeX %
- \else
- not %
- \fi
- detected%
- }%
-\endgroup
-\endinput