dvidrv.sty

\ProvidesPackage{dvidrv}[2001/05/23 Set the DVI driver name (JH)]
% dvidrv.sty
%  LaTeX file to help set the name of the dvi driver from the command line.
%
% BACKGROUND
%   I want to use different dvi drivers on the same source file.
% Some packages (e.g., graphics) must be told who they are outputting 
% specials to.  Something like this. 
%    > latex ``\def\dvidrv{dvips}\input myfile''
% (tested under Linux with bash) means that myfile.tex can have calls 
% like \usepackage[\dvidrv]{graphics} or \usepackage[\dvidrv]{hyperref}.
%   This package gives \dvidrv a default definition, so you can have
% \usepackage calls as above, but still leave the \def\dvidrv off of
% the command line.
%
% USAGE
%  With this in your source file
%    \documentclass{article}
%    \usepackage{dvidrv}
% the package will:
%  (1) if the command line is 
%      > latex ``\def\dvidrv{dvipdfm}\input myfile''
%    then \dvidrv will expand to `dvipdfm'.
%  (3) if the command line is 
%      > latex myfile
%    then the package will try to grab the default dvi driver from 
%    the graphics package's color.cfg.  If there is no such file then
%    the default is set to `dvips'.
% Also possible is to get a per-document default.  Call the package as
%    \documentclass{article}
%    \usepackage[dvipsone]{dvidrv}
% in which case, absent (1) above we have
%  (2) the package will set \dvidrv to `dvipsone'.
%
% HISTORY
% 2001-May-23 Jim Hefferon jim@joshua.smcvt.edu Written.
%               Donald Arseneau on ctt got me past an ExecuteOptions*
%               point that I didn't understand.  (Thanks!)
%
\usepackage{ifpdf}

% The INITIAL CODE part
\def\dvidrv@fungle#1{\@ifundefined{dvidrv}% only take first driver named
                       {\xdef\dvidrv{#1}\typeout{SETTING DVI DRIVER TO #1}
}%
                       {}}

% The DECLARATION OF OPTIONS part
\DeclareOption*{\dvidrv@fungle{\CurrentOption}}

% The EXECUTION OF OPTIONS part
\ProcessOptions\relax % grab any options off the options list for (2) above

\ifpdf
  \dvidrv@fungle{pdftex}%
\else
\@ifundefined{dvidrv}%
  {\InputIfFileExists{color.cfg}{\typeout{COLOR.CFG EXISTS}}{\dvidrv@fungle{pdftex}}}%
  {}
\def\strip@def#1.def{#1}
\typeout{THE DVI DRIVER IS \dvidrv}
\@ifundefined{Gin@driver}{}{\typeout{DVI DRIVER FOUND}\dvidrv@fungle{\expandafter\strip@def\Gin@driver}}
\fi

%  {{\let\ExecuteOptions=\dvidrv@fungle % inside of a group
%    \InputIfFileExists{color.cfg}{}{\dvidrv@fungle{dvipsk}}% default for (3)
%   }% leave group; restore meaning of ExecuteOptions
%  }%
%  {}

% The PACKAGE LOADING part

% The MAIN CODE part
\typeout{  The DVI driver is set to \dvidrv.}

% ========test file==========
%  This sets the driver to the graphicx package as described above.
%\documentclass{article}
%\usepackage[dvips]{dvidrv}
%\usepackage[\dvidrv]{graphicx}
%
%\begin{document}
%Hello. \dvidrv
%\end{document}