From: Alan Mackenzie <acm@muc.de>
To: Zhang Haijun <ccsmile2008@outlook.com>
Cc: "emacs-devel@gnu.org" <emacs-devel@gnu.org>
Subject: Re: Is it safe to use the combine-after-change-calls like this?
Date: Fri, 26 Apr 2019 10:31:39 +0000 [thread overview]
Message-ID: <20190426103139.GA4720@ACM> (raw)
In-Reply-To: <PS1PR06MB27594258895C38B6E0738AE3A8260@PS1PR06MB2759.apcprd06.prod.outlook.com>
Hello, Zhang.
On Thu, Apr 18, 2019 at 05:34:56 +0000, Zhang Haijun wrote:
> > combine-after-change-calls is ignored when before-change-functions is non-nil.
> I just recognize this. It is not nil in c++-mode buffers.
CC Mode maintains several caches of state information, which are updated
in the before-change-functions and after-change-functions hooks. This
is on the assumption that successive buffer changes are usually close to
eachother. Obviously, this is less true in iedit-mode, and it is likely
that these caches hinder rather than help in this case.
> > Also, regarding interaction with non-CC-mode buffers: you might be able
> > to improve the efficiency of the code by executing the command of the
> > various cursors starting with the one closest to point-max and finishing
> > with the one closest to point-min.
> I don’t understand this well. I see that when iedit-mode is on, it
> calls after-change-functions on change around every active cursors for
> every char inputing.
One thing which might help in the future is the macro
combine-change-calls, which is a bit like combine-after-change-calls,
but also works when before-change-functions isn't nil.
combine-change-calls is in the Emacs repository master, and should be
getting released with Emacs 27.1 in the medium future (maybe about a
year from now).
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2019-04-26 10:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-18 5:34 Is it safe to use the combine-after-change-calls like this? Zhang Haijun
2019-04-18 12:21 ` Stefan Monnier
2019-04-26 10:31 ` Alan Mackenzie [this message]
2019-04-26 12:09 ` Stefan Monnier
-- strict thread matches above, loose matches on Subject: below --
2019-04-17 0:21 Zhang Haijun
2019-04-17 1:14 ` Stefan Monnier
2019-04-17 18:28 ` Stefan Monnier
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=20190426103139.GA4720@ACM \
--to=acm@muc.de \
--cc=ccsmile2008@outlook.com \
--cc=emacs-devel@gnu.org \
/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.