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Message-ID:  <1A8B3E0C-24D3-4D27-A649-395D2035FB34@gmail.com>
Date:         Thu, 15 May 2008 23:55:37 +0930
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From: Will Robertson <wspr81@GMAIL.COM>
Subject: Re: Replacing inputenc for XeTeX/LuaTeX
To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
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On 15/05/2008, at 11:43 PM, Rainer Sch=F6pf wrote:

> Are your proposing something like this at the beginning of =20
> inputenc.sty:
>
> \ifThisIsXeTeX
>   \switchInputEncodingTo{\optarg}
> \endinput \fi
>
> ? If so, is there a simple implementation of \ifThisIsXeTeX ?

Pretty much, yes.

The ifxetex package provides \ifxetex (simply by checking for the =20
presence of \XeTeXversion).

Here's some code that does approximately the right thing: (intended to =20=

be a self-contained package in a XeTeX-exclusive search path to =20
override the normal inputenc.sty)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ProvidesPackage{inputenc}
   [2008/05/15 v0.1 XeTeX-specific inputenc package]
\typeout{%
   Loading a XeTeX-specific package to
   override LaTeX's inputenc package.}
\RequirePackage{ifxetex}
\RequireXeTeX
\DeclareOption*{%
   \PackageWarning{inputenc}{^^J\space\space
     XeTeX input encoding set to '\CurrentOption' for the rest of^^J%
     \space\space '\jobname' and all subsequent files to be read.^^J%
     This message occured}%
   \XeTeXinputencoding "\CurrentOption"%
   \XeTeXdefaultencoding "\CurrentOption"%
}
\ExecuteOptions{utf8}
\ProcessOptions
%%%%%%%%%%%%%%%%%%%%%%%%%%%%

It's not very robust at the moment (i.e., the names XeTeX uses don't =20
always map to the inputenc names; see =
<http://www.iana.org/assignments/character-sets=20
 > for the full list of encoding names) so I'll have to do something =20
about that. But that's the general approach.

I'm happy to maintain such a package that's intended to live in tex/=20
xelatex/inputenc.sty if you like; otherwise, it should probably be =20
rolled into inputenc.sty proper.

Many thanks,
Will=

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