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Re: [AUCTeX-devel] Check engines before running LaTeX

From: Mosè Giordano
Subject: Re: [AUCTeX-devel] Check engines before running LaTeX
Date: Fri, 21 Aug 2015 15:34:38 +0200

Hi Tassilo,

2015-08-21 8:15 GMT+02:00 Tassilo Horn <address@hidden>:
> Mosè Giordano <address@hidden> writes:
> Hi Mosè,
>> I sometimes happen to try to compile documents with a wrong engine
>> (above all example documents found on the Internet and the culprits
>> are fontspec and polyglossia, which require LuaTeX or XeTeX).  I'd
>> like to be warned by AUCTeX that I'm going to get an error, then I
>> wrote the attached patch.
>> Style authors should specify the engines required by the package (e.g.
>> LuaTeX and XeTeX for fontspec and polyglossia), then if the option
>> `TeX-check-engine' is non-nil the user will be warned before running
>> LaTeX command that a wrong engine has been selected, for example when
>> `TeX-engine' is set to `default'.
>> If you know other packages requiring a specific engine please tell us.
> No, not exactly engine dependencies.  But other packages have other
> requirements.  For example, minted requires that you use -shell-escape
> (--shell-escape with LuaTeX).  And to use pstricks with LuaTeX, you need
> something like
> \RequirePackage{ifluatex}
> \documentclass{article}
> \ifluatex
>   \usepackage{fontspec}
>   \setmainfont{TeX Gyre Pagella}
> \else
>   \usepackage{tgpagella}
>   \usepackage{pstricks}
> \fi
> \usepackage{auto-pst-pdf}
> which is not really testable.

Uhm, I'm not sure this isn't testable, but this would be anyway too
much tailored to a non basic package.  Instead, fontspec and
polyglossia are almost mandatory when using Lua/XeLaTeX.  By the way,
I once wrote down a style file for polyglossia, I should review and
update it one day.

> And hyperref, varioref, and cleveref can be used only if they are
> use-packaged in one specific order.
> So the constraints can be much more complex than just being restricted
> to some special engine, and I think the engine is the simplest part of
> it.
> But that shouldn't stop you of course.  If you think it's helpful, then
> by all means do it.

Thanks, done.


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