Fwd: CC Mode 5.32.4 (Java/lahw); Hooks in cc-mode seems run twice

[Xiao H. <xia...@gm...>]

Sorry, just forgot to cc cc-mode mailing list.

---------- Forwarded message ----------
From: Xiao Hanyu <xia...@gm...>
Date: Sun, Oct 20, 2013 at 10:29 PM
Subject: Re: CC Mode 5.32.4 (Java/lahw); Hooks in cc-mode seems run twice
To: Alan Mackenzie <ac...@mu...>


Hi, Alan:

Thanks for your response.

First I want to make sure that you mean that in the lastest cc-mode
release, this hook will called once, right?

Second, I found this quirk since I'm doing my own dotemacs project(
http://github.com/xiaohanyu/oh-my-emacs) and trying to adopt emacs-eclim(
https://github.com/senny/emacs-eclim/<https://github.com/senny/emacs-eclim/pull/118>)
and auto-complete(https://github.com/auto-complete/auto-complete) and found
auto-complete's "ac-sources" would contains same ac backend, thus results
in a poor auto-completion performance. After hours of investigation, I
finally found this quirk. That's the story.

And it seems that GNU recommend hooks functions to be idempotent, so I've
made a patch for emacs-eclim project(
https://github.com/senny/emacs-eclim/pull/118).


On Sun, Oct 20, 2013 at 6:09 PM, Alan Mackenzie <ac...@mu...> wrote:

> Hello, Hanyu.
>
> On Wed, Oct 16, 2013 at 01:41:08PM +0800, Xiao Hanyu wrote:
> > I've found that the mode hooks of cc-mode will run twice, same problems
> > here:
>
> >
> http://stackoverflow.com/questions/11911266/c-mode-hook-and-c-mode-hook-appears-to-run-twice
>
> > I'm not sure whether this is a normal case or a bug.
>
> This is a bit of friction between CC Mode and the Emacs core.  For a few
> years now, Emacs has declared java-mode (and friends) using the macro
> `defined-derived-mode'.  This macro rigidly inserts a call to
> `java-mode-hook' after the body of `java-mode'.  However, the body of
> `java-mode' itself calls the hook, since it needs to do something after
> that call.
>
> Basically, things just don't jell together quite that well.  In the
> standalone CC Mode (available from
> <http://cc-mode.sourceforge.net/release.php>) the hook only gets called
> once.
>
> But the big question is, does this double call cause you any actual
> problems?
>
> Anyhow, thanks for taking the trouble to report this quirk.
>
> > The following is the details of my environment:
>
> [ .... ]
>
> > --
>
> > Best regards
>
> > Hanyu Xiao ^_^ 肖晗宇
>
> --
> Alan Mackenzie (Nuremberg, Germany).
>



-- 

Best regards

Hanyu Xiao ^_^ 肖晗宇



-- 

Best regards

Hanyu Xiao ^_^ 肖晗宇