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Re: Hl-line and visual-line
From: |
David Reitter |
Subject: |
Re: Hl-line and visual-line |
Date: |
Sun, 23 May 2010 15:13:42 -0400 |
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.)
- Hl-line and visual-line, David Reitter, 2010/05/20
- Re: Hl-line and visual-line, Eli Zaretskii, 2010/05/20
- Re: Hl-line and visual-line, David Reitter, 2010/05/20
- Re: Hl-line and visual-line, Tassilo Horn, 2010/05/21
- Re: Hl-line and visual-line, Eli Zaretskii, 2010/05/21
- Re: Hl-line and visual-line, Tassilo Horn, 2010/05/21
- Re: Hl-line and visual-line, David Reitter, 2010/05/21
- Re: Hl-line and visual-line, Eli Zaretskii, 2010/05/21
- Re: Hl-line and visual-line, Eli Zaretskii, 2010/05/23
- Re: Hl-line and visual-line,
David Reitter <=
- Re: Hl-line and visual-line, Eli Zaretskii, 2010/05/23
- Re: Hl-line and visual-line, David Reitter, 2010/05/23
- Re: Hl-line and visual-line, Eli Zaretskii, 2010/05/24
- Re: Hl-line and visual-line, Stefan Monnier, 2010/05/24
- Re: Hl-line and visual-line, Lennart Borgman, 2010/05/24
- Re: Hl-line and visual-line, Eli Zaretskii, 2010/05/24
- Re: Hl-line and visual-line, Lennart Borgman, 2010/05/24
- Re: Hl-line and visual-line, David Reitter, 2010/05/24
- Re: Hl-line and visual-line, Lennart Borgman, 2010/05/24
- Re: Hl-line and visual-line, Lennart Borgman, 2010/05/21