From: David Reitter <david.reitter@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: tassilo@member.fsf.org, emacs-devel@gnu.org
Subject: Re: Hl-line and visual-line
Date: Sun, 23 May 2010 15:13:42 -0400 [thread overview]
Message-ID: <47101594-5A7C-4FF1-8C58-C77AF33F35F2@gmail.com> (raw)
In-Reply-To: <83r5l2o7fx.fsf@gnu.org>
On May 23, 2010, at 1:26 PM, Eli Zaretskii wrote:
> I have one request, though: could you (or someone else) please post
> requirements for what these functions should do? That is, of course,
> trivial with unidirectional text, but what about reordered text?
>
> Let's say we have buffer text
>
> abcde ABCDE FGHIJ xyz
>
> which will be displayed under Visual Line mode as
>
> abcde JIHGF
> EDCBA xyz
>
> Where should beginning/end-of-visual-line put point in each one of
> these two screen lines?
The first use case would be to jump to beginning and end of a visual line. That means, if point is at any of {abcde JIHGF}, beginning would be at "a" and the end at " " (between "E " and "F").
If point is at any of {ABCDE xyz}, then beginning would be at "E" and end would be after "z".
This would cover my use case and C-a, C-e.
C-k (kill-visual-line) would probably need to be rewritten anyway.
A quick grep through the Emacs and Aquamacs source codes does not reveal uses in different contexts.
The second use case would be to actually capture a whole line. I have functions that kill the whole line (from left to right). They would use `kill-region' from X to Y. The same goes for hl-line-mode, where ONE overlay is drawn.
So, these functions would need a new function such as "regions-within-visual-line" or so, returning a list of (from . to) regions, or some other means of identifying the region.
So far for two requirements.
Are we going to have discontinuous regions? When I set the Mark at "c" in your example, and point at "G", what is highlighted (transient-mark-mode), and what is killed?
I'm not quite sure what the general interface will be for other functions in such situations, so I can't help further with that... (NB You're throwing some of the most basic assumptions away. This could get interesting.)
next prev parent reply other threads:[~2010-05-23 19:13 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-20 20:30 Hl-line and visual-line David Reitter
2010-05-20 21:02 ` Eli Zaretskii
2010-05-21 2:35 ` David Reitter
2010-05-21 6:34 ` Tassilo Horn
2010-05-21 8:17 ` Eli Zaretskii
2010-05-21 10:16 ` Tassilo Horn
2010-05-21 14:22 ` David Reitter
2010-05-21 14:57 ` Eli Zaretskii
2010-05-23 17:26 ` Eli Zaretskii
2010-05-23 19:13 ` David Reitter [this message]
2010-05-23 20:33 ` Eli Zaretskii
2010-05-23 23:04 ` David Reitter
2010-05-24 18:16 ` Eli Zaretskii
2010-05-24 18:46 ` Stefan Monnier
2010-05-24 19:06 ` Lennart Borgman
2010-05-24 22:24 ` Eli Zaretskii
2010-05-24 22:37 ` Lennart Borgman
2010-05-24 22:47 ` David Reitter
2010-05-24 23:03 ` Lennart Borgman
2010-05-21 16:54 ` Lennart Borgman
2010-05-21 17:39 ` Eli Zaretskii
2010-05-21 20:24 ` Stefan Monnier
2010-05-21 22:31 ` Lennart Borgman
2010-05-22 0:18 ` Stefan Monnier
2010-05-22 2:35 ` Lennart Borgman
2010-05-22 13:10 ` Lennart Borgman
2010-05-22 17:04 ` Lennart Borgman
2010-05-21 6:36 ` Eli Zaretskii
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