From: Alan Mackenzie <acm@muc.de>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: 17453@debbugs.gnu.org
Subject: bug#17453: Isearch doesn't work properly with Follow Mode.
Date: Sun, 11 May 2014 20:40:17 +0000 [thread overview]
Message-ID: <20140511204017.GB2759@acm.acm> (raw)
In-Reply-To: <jwvr4405eu9.fsf-monnier+emacsbugs@gnu.org>
Hello, Stefan.
On Sun, May 11, 2014 at 03:05:17PM -0400, Stefan Monnier wrote:
> >> It shouldn't be too difficult. It's just a matter of refactoring:
> >> change your patch so that on isearch.el's side it only adds some hooks,
> >> which are then set follow-mode.el.
> > Do you mean "set to a function in follow-mode.el". I think you're
> > suggesting writing more functions in follow-mode.el. Do you mean
> > something like a Follow Mode equivalent of `window-start'?
> Right, I think introducing new functions/hooks to get the beginning/end of the
> visible part of the buffer, which can then be overridden by follow-mode
> would probably be part of the solution.
OK, but it really needs a window list as a parameter, and that needs to
be stored in a variable somewhere.
> > I know the motivation for the change. For what functionalities should
> > code be come up with that will be incorporated into these hooks? What
> > will the hooks do, specifically?
> I don't know. You know the code better than I do, so hopefully you can
> come up with good ideas.
I don't really see opportunities for this whose costs don't outweigh
them. We can make a variable called `window-start-function', but then
everybody has to start using
(funcall window-start-function w)
which is a little more obfuscated and confusing than
(window-start w)
just to save a (very) few calls of
(window-start (car foo-windows))
. The last form is typically going to be much faster when Follow Mode is
active (see below).
[ Snipped bit about pre-redisplay-function. Thanks. ]
> > Is it for "bring-region-into-sight" and friends that you envisage adding
> > hooks?
> Yes.
> > I'm not sure how well a hook would work for this functionality, since in
> > the "plain" hook function you'd want to pass it a window, whereas in the
> > "follow" hook function you'd want to pass it a list of windows.
> I don't see why you'd need to pass anything like a window or a list
> of windows. All it needs is a region and a point. The window (or set
> thereof) would be passed implicitly via selected-window, as usual.
Because each time the Follow Mode window list would have to be
recalculated, and this is a moderately expensive calculation, involving
filtering and sorting the windows in a frame (`follow-all-followers').
This is no big deal once per command, but if done much more often will
start to drag.
[ .... ]
> Right, designing an API is often tricky.
:-)
> > The whole patch addresses the main bug; forming generally useful
> > subroutines out of isearch-string-out-of-window and friends is the other
> > bug, which I'm suggesting be dealt with separately.
> I don't want to add code specific to follow-mode directly in Isearch.
There is one place where I think it is unavoidable, and that is adding
lazy highlight overlays. These are currently given a `window' property
to restrict their effect to the current window. In my patch, a
particular match gets _two_ (or even several) overlays when it spans two
or more Follow Mode windows. This can surely not be abstracted away in
any sensible way.
> So the way to fix the bug is in 2 steps:
> - refactor Isearch so that it adds the hooks we need (some of this,
> may involve creating new functions in subr.el such as discussed above).
> - change follow-mode.el to set those hooks as appropriate.
> There's then a 3rd step which is to make other packages than Isearch use
> those same new functions/hooks, but that one can be postponed.
> Stefan
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2014-05-11 20:40 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-09 22:44 bug#17453: Isearch doesn't work properly with Follow Mode Alan Mackenzie
2014-05-10 2:40 ` Stefan Monnier
2014-05-11 12:58 ` Alan Mackenzie
2014-05-11 16:09 ` Stefan Monnier
2014-05-11 18:18 ` Alan Mackenzie
2014-05-11 19:05 ` Stefan Monnier
2014-05-11 20:40 ` Alan Mackenzie [this message]
2014-05-11 21:46 ` Stefan Monnier
2015-10-29 23:23 ` Alan Mackenzie
2015-10-31 22:35 ` John Wiegley
2015-10-31 22:35 ` John Wiegley
2015-10-31 23:25 ` Alan Mackenzie
2015-10-31 23:41 ` John Wiegley
2015-11-01 11:59 ` Alan Mackenzie
2015-11-01 11:59 ` Alan Mackenzie
2015-10-31 23:41 ` John Wiegley
2015-10-31 23:25 ` Alan Mackenzie
2015-11-01 0:17 ` Drew Adams
2015-11-01 0:17 ` Drew Adams
2015-10-31 23:13 ` Artur Malabarba
2015-10-31 23:32 ` Alan Mackenzie
2015-10-31 23:32 ` Alan Mackenzie
2015-11-01 12:20 ` Artur Malabarba
2015-11-01 12:23 ` Artur Malabarba
2015-11-01 13:52 ` Alan Mackenzie
2015-11-01 16:50 ` Eli Zaretskii
2015-11-01 18:27 ` Alan Mackenzie
2015-11-01 19:46 ` Artur Malabarba
2015-11-01 20:15 ` Alan Mackenzie
2015-11-01 21:37 ` Artur Malabarba
2015-11-01 20:42 ` Artur Malabarba
2015-11-01 20:54 ` Eli Zaretskii
2015-11-01 22:19 ` Alan Mackenzie
2015-11-01 12:23 ` Artur Malabarba
2015-11-01 12:20 ` Artur Malabarba
2015-10-31 23:13 ` Artur Malabarba
2015-10-31 23:35 ` Juri Linkov
2015-10-31 23:35 ` Juri Linkov
2015-10-31 23:56 ` Alan Mackenzie
2015-11-02 0:14 ` Juri Linkov
2015-11-02 3:35 ` Eli Zaretskii
2015-11-02 3:35 ` Eli Zaretskii
2015-11-02 9:28 ` Alan Mackenzie
2015-11-02 11:53 ` Artur Malabarba
2015-11-02 12:14 ` Artur Malabarba
2015-11-02 12:14 ` Artur Malabarba
2015-11-02 12:39 ` Alan Mackenzie
2015-11-02 12:39 ` Alan Mackenzie
2015-11-02 12:35 ` Alan Mackenzie
2015-11-02 12:35 ` Alan Mackenzie
2015-11-02 13:10 ` Artur Malabarba
2015-11-02 14:18 ` Artur Malabarba
2015-11-02 14:18 ` Artur Malabarba
2015-11-02 15:44 ` Alan Mackenzie
2015-11-02 15:44 ` Alan Mackenzie
2015-11-02 16:26 ` Artur Malabarba
2015-11-02 16:35 ` Drew Adams
2015-11-02 19:18 ` Artur Malabarba
2015-11-02 19:28 ` Drew Adams
2015-11-02 23:45 ` Juri Linkov
2015-11-02 22:09 ` Alan Mackenzie
2015-11-02 23:00 ` Artur Malabarba
2015-11-03 9:18 ` Alan Mackenzie
2015-11-02 17:45 ` Eli Zaretskii
2015-11-02 23:22 ` Juri Linkov
2015-11-03 12:31 ` Alan Mackenzie
2015-11-03 15:49 ` Eli Zaretskii
2015-11-03 16:18 ` Artur Malabarba
2015-11-03 22:11 ` Alan Mackenzie
2015-11-04 0:28 ` Juri Linkov
2015-11-04 9:01 ` Alan Mackenzie
2015-11-04 10:17 ` Artur Malabarba
2015-11-05 12:38 ` Alan Mackenzie
2015-11-05 17:13 ` Artur Malabarba
2015-11-07 12:59 ` Alan Mackenzie
2015-11-07 13:38 ` Eli Zaretskii
2015-11-08 10:32 ` Alan Mackenzie
2015-11-03 16:39 ` Alan Mackenzie
2015-11-03 12:31 ` Alan Mackenzie
2015-11-02 23:22 ` Juri Linkov
2015-11-02 23:28 ` Juri Linkov
2015-11-02 23:28 ` Juri Linkov
2015-11-02 13:10 ` Artur Malabarba
2015-11-02 15:46 ` Eli Zaretskii
2015-11-02 16:09 ` Alan Mackenzie
2015-11-02 17:49 ` Eli Zaretskii
2015-11-02 20:35 ` John Wiegley
2015-11-03 8:35 ` Alan Mackenzie
[not found] ` <<831tc8xv39.fsf@gnu.org>
2015-11-02 16:05 ` Drew Adams
2015-11-02 11:53 ` Artur Malabarba
2015-11-02 23:33 ` Juri Linkov
2015-11-02 23:33 ` Juri Linkov
2015-11-02 0:14 ` Juri Linkov
2015-10-31 23:56 ` Alan Mackenzie
2015-10-29 23:23 ` Alan Mackenzie
[not found] ` <handler.17453.B.139967578531952.ack@debbugs.gnu.org>
2015-12-20 12:59 ` bug#17453: Acknowledgement (Isearch doesn't work properly with Follow Mode.) Alan Mackenzie
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20140511204017.GB2759@acm.acm \
--to=acm@muc.de \
--cc=17453@debbugs.gnu.org \
--cc=monnier@iro.umontreal.ca \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.