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References: <20210420080026.GA823@polynum.com>
            <0127509d-02b8-daa7-a49f-6bf459e75cd7@morningstar2.co.uk>
            <20210420113548.GA5053@polynum.com>
            <6bd6d821-150d-ec6e-d9d3-a8abde6d87dd@morningstar2.co.uk>
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Message-ID:  <20210420142249.GA8673@polynum.com>
Date:         Tue, 20 Apr 2021 16:22:49 +0200
Reply-To:     Mailing list for the LaTeX3 project
              <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
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From:         LARONDE Thierry <tlaronde@POLYNUM.COM>
Subject: Re: LaTeX required primitives: some questions
To:           LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
In-Reply-To:  <6bd6d821-150d-ec6e-d9d3-a8abde6d87dd@morningstar2.co.uk>
Precedence: list
Envelope-To: <rainer.schoepf@gmx.net>
Status: R

On Tue, Apr 20, 2021 at 02:13:12PM +0100, Joseph Wright wrote:
> 
> >>The PDF level
> >
> >>does have some impact on output features but in a simply 'Sorry, not doable'
> >>sense.  Note that XeTeX uses XDV, which is a version of DVI dedicated to
> >>this engine. It's not necessary to test the DVI version at the macro level:
> >>what's important is for example which method to include imagines, which uses
> >>an engine test.
> >>
> >>>\outfmtset: setting the output format, that shall be amongst the formats
> >>>	supported. If not, it returns an error and set the output format to
> >>>	the default one. Shall be set before \shipout and errors if used
> >>>	after output has started.
> >>>
> >>>\outfmt: a token identifying the current output format.
> >>
> >>See above: data in the same format as other engines is strongly preferred.
> >
> >Well, since there is no real consensus and these are not amongst the
> >required---and with the identification of the engine, one could \input
> >ad hoc macros---I will for now stick to my proposal.
> 
> Currently we can do something like
> 
>     \catcode`\@=11
>     \ifdefined\pdfoutput
>       \let\pdf@output\pdfoutput
>     \else
>       \ifdefined\outputmode
>         \let\pdf@output\outputmode
>       \else
>         \newcount\pdf@output
>       \fi
>     \fi
> 
> then can use \pdf@output as a one-shot to know if we are in PDF or DVI mode,
> and if we are using pdfTeX/LuaTeX we can also set it. With a token-based
> indicator, we can of course set up something similar but it gets longer.
> However, this is of course your call, and as you are not making PDF, it's
> not so important (it's most useful for pdfTeX and LuaTeX where both DVI and
> PDF are possible).
> 

Well, I will see during implementation. I want it to be fairly stable on
the primitives side.

Best,
-- 
        Thierry Laronde <tlaronde +AT+ polynum +dot+ com>
                     http://www.kergis.com/
                    http://kertex.kergis.com/
                       http://www.sbfa.fr/
Key fingerprint = 0FF7 E906 FBAF FE95 FD89  250D 52B1 AE95 6006 F40C