From: "Davis Herring" <herring@lanl.gov>
To: "Alan Mackenzie" <acm@muc.de>
Cc: Chong Yidong <cyd@stupidchicken.com>, emacs-devel@gnu.org
Subject: Re: Documentation of transient-mark-mode is sloppy, wrong, and confused.
Date: Thu, 28 May 2009 16:53:14 -0700 (PDT) [thread overview]
Message-ID: <44395.130.55.118.19.1243554794.squirrel@webmail.lanl.gov> (raw)
In-Reply-To: <20090528230359.GA1474@muc.de>
>> Some commands, which ordinarily operate on the region when the mark is
>> active, instead act on the entire buffer.
>
> That is a definition of "active", surely, as I suggested above. Surely,
> it is better to regard the mark and region as being inactive when t-m-m
> is disabled?
It seems to me that there are two kinds of activeness of the mark (and the
region; they have between them only one state). The first kind (call it
active1) is associated with commands like `kill-region', which refuse to
do anything unless the region is active1. Outside of transient mark mode,
the mark is always active1 if it exists at all; with tmm, the mark is
frequently activated1 and deactivated1.
The other kind (active2) is associated with commands like `undo',
`insert-parentheses', and `how-many', which restrict, extend, or change
(respectively) their area of effect to be the region iff it is active2.
Outside of transient mark mode, the mark is never active2 at all; with
tmm, the mark is active2 iff it is active1.
So we see that while there are two predicates, they can be resolved as (or
(not transient-mark-mode) (mark-active)) and (and transient-mark-mode
(mark-active)). Since my imaginary function `mark-active' is only ever
called when tmm is on, we may take it to return nil otherwise and replace
active2 with just (mark-active). There is then only one variable
"active", but tmm has different effects on different interpretations of
its value.
Sidebar: I like the 22 feature of turning tmm on temporarily; I don't like
it in general (partly because I like the mark being active1), but
otherwise I cannot have an active2 mark at all.
Davis
--
This product is sold by volume, not by mass. If it appears too dense or
too sparse, it is because mass-energy conversion has occurred during
shipping.
next prev parent reply other threads:[~2009-05-28 23:53 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-28 12:29 Documentation of transient-mark-mode is sloppy, wrong, and confused Alan Mackenzie
2009-05-28 16:54 ` Chong Yidong
2009-05-28 20:15 ` Alan Mackenzie
2009-05-28 20:48 ` Chong Yidong
2009-05-28 23:03 ` Alan Mackenzie
2009-05-28 23:53 ` Davis Herring [this message]
2009-05-29 11:01 ` Alan Mackenzie
2009-05-29 0:21 ` Chong Yidong
2009-05-29 1:55 ` Stefan Monnier
2009-05-29 4:30 ` Kevin Rodgers
2009-05-29 5:47 ` Andreas Roehler
2009-05-29 8:25 ` Stephen J. Turnbull
2009-05-29 8:58 ` Alan Mackenzie
2009-06-01 2:34 ` Stephen J. Turnbull
2009-06-01 9:40 ` Lennart Borgman
2009-06-02 6:23 ` Andreas Roehler
2009-06-02 11:50 ` Stephen J. Turnbull
2009-05-29 8:37 ` Eli Zaretskii
2009-05-29 9:27 ` Alan Mackenzie
2009-05-29 10:11 ` Eli Zaretskii
2009-05-29 13:13 ` Alan Mackenzie
2009-05-29 14:19 ` Stefan Monnier
2009-05-29 16:40 ` Drew Adams
2009-05-29 22:20 ` Alan Mackenzie
2009-05-30 0:11 ` Drew Adams
2009-05-29 9:55 ` Stephen J. Turnbull
2009-05-29 10:14 ` Eli Zaretskii
2009-06-01 2:09 ` Stephen J. Turnbull
2009-05-29 10:45 ` Andreas Roehler
2009-05-29 8:38 ` Eli Zaretskii
2009-05-29 9:35 ` Alan Mackenzie
2009-05-29 9:48 ` Eli Zaretskii
2009-05-29 13:17 ` Alan Mackenzie
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