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From: "Andreas Röhler" <andreas.roehler@online.de>
To: rms@gnu.org
Cc: Juri Linkov <juri@jurta.org>,
	"Stephen J. Turnbull" <stephen@xemacs.org>,
	emacs-devel@gnu.org, Stefan Monnier <monnier@iro.umontreal.ca>,
	Miles Bader <miles@gnu.org>
Subject: Re: region-active-p
Date: Tue, 23 Oct 2007 10:53:26 +0200	[thread overview]
Message-ID: <200710231053.28105.andreas.roehler@online.de> (raw)
In-Reply-To: <E1IkDw4-0007e7-AU@fencepost.gnu.org>

Am Dienstag, 23. Oktober 2007 09:12 schrieb Richard Stallman:
>     (defun region-active-p ()
>       "..."
>       (and zmacs-regions zmacs-region-extent
> 	   (eq (current-buffer) (zmacs-region-buffer))))
>
> When commands in XEmacs call this, do they also test
> for a nonempty region?  Or do they operate on the region
> when it is empty?

No. AFAIU `zmacs-region-extent' checks for a physical extend, it may be nil or 
have a value, for example I got

,----
| `zmacs-region-extent' is a variable declared in Lisp.
|   -- loaded from "/home/speck/progarbeit/xemacs/veraendert/simple.el"
| 
| Value: #<extent [147998, 148021] 0x8e8aa24 in buffer simple.el>
| 
| Documentation:
| The extent of the zmacs region; don't use this. 
`----


`zmacs-regions' seems equivalent to
`transient-mark-mode':

,----
| `zmacs-regions' is a built-in boolean variable.
|   -- loaded 
from "/usr/src/packages/BUILD/xemacs-21.5.27.20060705/src/editfns.c"
| 
| Value: t
| 
| Documentation:
| *Whether LISPM-style active regions should be used.
| This means that commands which operate on the region (the area between the
| point and the mark) will only work while the region is in the ``active''
| state, which is indicated by highlighting.
`----

>
> I don't see any need for region-exists-p
> unless we want it specifically to run code in Emacs
> which was written for XEmacs.

AFAIS `region-exists-p' in XEmacs delivers precisely
the value `mark-active' in GNU has.

To provide respective symbols in both Emacsen would
save time for programmers.

Maybe it could be written in GNU somehow as

(defun region-exists-p ()
  mark-active)

and in XEmacs

(setq mark-active (region-exists-p))


Andreas Röhler

  reply	other threads:[~2007-10-23  8:53 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-19  9:49 region-active-p Andreas Röhler
2007-10-19 20:57 ` region-active-p Juri Linkov
2007-10-21  7:25   ` region-active-p Richard Stallman
2007-10-21 13:56     ` region-active-p Stefan Monnier
2007-10-21 14:48       ` region-active-p Miles Bader
2007-10-21 19:22         ` region-active-p Andreas Röhler
2007-10-23  7:12           ` region-active-p Richard Stallman
2007-10-23  8:53             ` Andreas Röhler [this message]
2007-10-23 17:53               ` region-active-p Richard Stallman
2007-10-24  7:33                 ` region-active-p Andreas Röhler
2007-10-25  2:10                   ` region-active-p Richard Stallman
2007-10-24 19:34             ` region-active-p Stephen J. Turnbull
2007-10-25  9:01               ` region-active-p Richard Stallman
2007-10-26  5:38                 ` region-active-p Stephen J. Turnbull
2007-10-26  8:17                   ` region-active-p Andreas Röhler
2007-10-26  9:21                     ` region-active-p Stephen J. Turnbull
2007-10-26 11:03                       ` region-active-p Andreas Röhler
2007-10-26 21:53                         ` region-active-p Stephen J. Turnbull
2007-10-27  2:28                       ` region-active-p Richard Stallman
2007-10-27  5:20                         ` region-active-p Stephen J. Turnbull
2007-10-27  6:17                           ` region-active-p Miles Bader
2007-10-27  7:57                             ` region-active-p Andreas Röhler
2007-10-28  6:55                             ` region-active-p Stephen J. Turnbull
2007-10-28  7:32                               ` region-active-p Miles Bader
2007-10-28 12:15                             ` region-active-p Johan Bockgård
2007-10-28 21:07                               ` region-active-p Stefan Monnier
2007-10-28 21:07                               ` region-active-p Stefan Monnier
2007-10-27 23:41                           ` region-active-p Richard Stallman
2007-10-28  1:21                             ` region-active-p Stefan Monnier
2007-10-28  1:27                               ` region-active-p Miles Bader
2007-10-28  2:43                                 ` region-active-p Stefan Monnier
2007-10-29  0:11                               ` region-active-p Richard Stallman
2007-10-29  1:40                                 ` region-active-p Stefan Monnier
2007-12-10 23:08                                   ` region-active-p Richard Stallman
2007-12-11  8:15                                     ` region-active-p Andreas Röhler
2007-12-11  9:57                                       ` region-active-p Juri Linkov
2007-12-11 11:52                                         ` region-active-p Andreas Röhler
2007-12-11 14:55                                           ` region-active-p Stefan Monnier
2007-12-11 17:05                                             ` region-active-p Andreas Röhler
2007-12-11 18:16                                               ` region-active-p Stefan Monnier
2007-12-11  9:07                                     ` region-active-p Andreas Röhler
2007-12-11  9:59                                       ` region-active-p Juri Linkov
2007-12-11 11:50                                         ` region-active-p Andreas Röhler
2007-10-28  7:29                             ` region-active-p Stephen J. Turnbull
2007-10-28 21:06                               ` region-active-p Stefan Monnier
2007-10-29  0:11                               ` region-active-p Richard Stallman
2007-10-30  0:12                                 ` region-active-p Stephen J. Turnbull
2007-10-30  8:22                                   ` region-active-p Richard Stallman
2007-10-30  8:59                                     ` region-active-p David Kastrup
2007-10-31  7:46                                       ` region-active-p Richard Stallman
2007-10-30 15:03                                     ` region-active-p Drew Adams
2007-10-30 19:03                                       ` region-active-p Stefan Monnier
2007-10-30 19:49                                         ` region-active-p Drew Adams
2007-10-30 20:15                                           ` region-active-p Stefan Monnier
2007-10-30 20:28                                             ` region-active-p Drew Adams
2007-10-30 21:30                                               ` region-active-p Stefan Monnier
2007-10-30 23:43                                           ` region-active-p Miles Bader
2007-10-31  6:35                                             ` region-active-p David Kastrup
2007-10-31  7:59                                               ` region-active-p Miles Bader
2007-11-03 21:08                                             ` region-active-p Stephen J. Turnbull
2007-10-31  7:47                                       ` region-active-p Richard Stallman
2007-10-31  7:47                                       ` region-active-p Richard Stallman
2007-10-31  8:00                                         ` region-active-p Miles Bader
2007-10-31 23:58                                           ` region-active-p Richard Stallman
2007-11-01  2:33                                             ` region-active-p Miles Bader
2007-11-01  2:55                                               ` region-active-p Stefan Monnier
2007-11-01 10:06                                                 ` region-active-p Kim F. Storm
2007-11-01 15:46                                                   ` region-active-p Drew Adams
2007-11-01 17:56                                                     ` region-active-p David Kastrup
2007-11-01 23:08                                                       ` region-active-p Richard Stallman
2007-11-01 19:04                                               ` region-active-p Richard Stallman
2007-11-02  0:18                                                 ` region-active-p Miles Bader
2007-11-02 15:02                                                   ` region-active-p Richard Stallman
2007-11-02 21:39                                                     ` region-active-p Stefan Monnier
2007-11-02 22:31                                                     ` region-active-p Miles Bader
2007-11-03 20:48                                                       ` region-active-p Richard Stallman
2007-11-05  6:48                                                         ` region-active-p Miles Bader
2007-10-29  8:24                               ` region-active-p Andreas Röhler
2007-10-22  6:09         ` region-active-p Andreas Röhler
2007-10-21 17:18       ` region-active-p Stephen J. Turnbull
2007-10-21 20:54         ` region-active-p Reiner Steib

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