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% Copyright 2006 by Will Robertson <wspr81@gmail.com>
%
% Distributable under the LaTeX Project Public License,
% version 1.3c or higher (your choice). The latest version of
% this license is at: http://www.latex-project.org/lppl.txt
%
% This work is "maintained" (as per LPPL maintenance status)
% by Will Robertson.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% The ifxetex package, version 0.3
%%
%% Usage: LaTeX - \usepackage{ifxetex}
%% Plain - \input ifxetex.sty
%%
%% Function: Provides the \ifxetex boolean for testing
%% whether XeTeX is being used for typesetting.
%%
%% Provides the \RequireXeTeX command which throws
%% an error if XeTeX is not the engine in use.
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Ensure loading a single time only
\csname ifxetexloaded\endcsname
\let\ifxetexloaded\endinput
% Declare ourselves to LaTeX
\expandafter\ifx\csname ProvidesPackage\endcsname\relax\else
\ProvidesPackage{ifxetex}
[2006/08/21 v0.3 Provides ifxetex conditional]
\fi
% Create, if necessary, the \ifxetex conditional
\expandafter\ifx\csname ifxetex\endcsname\relax
\newif\ifxetex
\fi
% Set \ifxetex accordingly
\expandafter\ifx\csname XeTeXrevision\endcsname\relax
\xetexfalse
\else
\xetextrue
\fi
%
\def\RequireXeTeX{%
\ifxetex\else
\begingroup
\errorcontextlines=-1\relax
\newlinechar=10\relax
\errmessage{^^J
********************************************^^J
* XeTeX is required to compile this document.^^J
* Sorry!^^J
********************************************}%
\endgroup
\fi}
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