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Re: installing emacs and X11 on OS X
From: |
Eli Zaretskii |
Subject: |
Re: installing emacs and X11 on OS X |
Date: |
Mon, 28 Oct 2002 08:00:59 +0200 (IST) |
On 27 Oct 2002, Thomas F. Burdick wrote:
> This doesn't let me differentiate between Carbon-Emacs on OS X, and
> X11-Emacs on the same OS. system-type is darwin on both, and
> display-graphic-p is t on both. However, it makes a lot of sense (to
> me) that someone might want to make the Carbon one behave more like a
> Carbon application, and the X11 one behave like an X11 application.
If there's a difference between these two configurations, there should be
a way to distinguish between them. Doesn't system-configuration fit the
bill? or maybe system-configuration-options?
> Out of curiosity, why is it depricated? Because people abuse it where
> specific feature tests would be better?
Yes. And that makes application code, including users' .emacs, bitrot
alot when functionality of some window-system changes due to
development. I already mentioned the problem with .emacs files that
assumed window-system being nil means no colors.
> If so, that seems like a bad
> reason ... people can abuse anything
People will abuse less if they have less opportunities for abuse.
> but AFAIK, window-system is the
> only way to determine what window system you're on.
A small study into the uses of window-system in Emacs's own code that we
did shows that it is used to test for a small number of features, but those
features are implicit: they are neither stated clearly in the code nor
even clearly understood in some cases. So it seems like window-system is
a powerful tool for obfuscating Lisp code.
By contrast, the explicit predicates such as display-multi-font-p
actually say exactly what is the feature that's being tested. And the
maintenance effort needed to keep a small number of predicates in sync
with Emacs development is much less than what would be needed to go
through all the *.el files and modify them whenever some window-system
gets an extra feature it didn't have before. As an example, consider a
future development of drop-down menus on a character terminal.
> Or is there a
> plan to replace this with a more competant introspection api?
Such a plan is already in place: those are the display-*-p predicates
advertized by NEWS in the same item which says window-system should not
be used.
> [ It would be cool to be able to have something like a window-system-p
> function, so I could ask (window-system-p 'carbon) or
> (window-system-p 'x11) or (window-system-p 'gtk).
I think system-configuration and/or system-configuration-options should
allow you to do this.
- Re: installing emacs and X11 on OS X, (continued)
- Message not available
- Re: installing emacs and X11 on OS X, Hugo Wolf, 2002/10/26
- Re: installing emacs and X11 on OS X, Eli Zaretskii, 2002/10/26
- Message not available
- Re: installing emacs and X11 on OS X, Hugo Wolf, 2002/10/26
- Re: installing emacs and X11 on OS X, Eli Zaretskii, 2002/10/26
- Message not available
- Re: installing emacs and X11 on OS X, Hugo Wolf, 2002/10/27
- Re: installing emacs and X11 on OS X, Piet van Oostrum, 2002/10/27
- Re: installing emacs and X11 on OS X, Hugo Wolf, 2002/10/27
- Re: installing emacs and X11 on OS X, Eli Zaretskii, 2002/10/27
- Re: installing emacs and X11 on OS X, Thomas F. Burdick, 2002/10/27
- Re: installing emacs and X11 on OS X, Hugo Wolf, 2002/10/27
- Re: installing emacs and X11 on OS X,
Eli Zaretskii <=
- Message not available
- Re: installing emacs and X11 on OS X, Hugo Wolf, 2002/10/27
- Re: installing emacs and X11 on OS X, Chris Lott, 2002/10/27
Re: installing emacs and X11 on OS X, Hugo Wolf, 2002/10/23
Re: installing emacs and X11 on OS X, John Paul Wallington, 2002/10/24
Re: installing emacs and X11 on OS X, Hugo Wolf, 2002/10/28
Re: installing emacs and X11 on OS X, Thomas F. Burdick, 2002/10/28