RE: something like linum.el ought to be added

From: <brianjiang@gdnt.com.cn>
To: <rms@gnu.org>, <monnier@iro.umontreal.ca>
Cc: lekktu@gmail.com, markus.triska@gmx.at, emacs-devel@gnu.org
Subject: RE: something like linum.el ought to be added
Date: Mon, 17 Sep 2007 13:12:36 +0800	[thread overview]
Message-ID: <63F95800EDD046419F17688AAFD41CCF01DE55D0@rnd-ex01.rnd.gdnt.local> (raw)
In-Reply-To: <E1IX7l9-0007kR-1h@fencepost.gnu.org>

sometimes we can use outline- or hs- and others functions to hide a lot of lines.  it seems linum mode create/move overlays for every line between window-start and window-end. So even the line is already hide, linum still create/move overlay for it. If there are many line hiden within the window, it will consume a lot of memory, also impact the performance/efficience of the linum mode.  Is it possible to avoid the create linum overly for the invisible line? 

-----Original Message-----
From: emacs-devel-bounces+brianjiang=gdnt.com.cn@gnu.org [mailto:emacs-devel-bounces+brianjiang=gdnt.com.cn@gnu.org] On Behalf Of Richard Stallman
Sent: 2007年9月17日 11:59
To: Stefan Monnier
Cc: lekktu@gmail.com; markus.triska@gmx.at; emacs-devel@gnu.org
Subject: Re: something like linum.el ought to be added

    > I think that means we need to add a suitable hook which redisplay can
    > call to inform Lisp code that visibility changes may have altered the
    > position of the bottom of the window.

    OTOH, using jit-lock would make this unnecessary.

jit-lock implements a specific functionality, fontification, and nothing else.

I thought that the hooks used by jit-lock ought to be sufficient for linum as well.  But it turns out they are not, because the code to run Vfontification_functions checks specifically for the `fontified' property.

We could add another similar hook, or a more general mechanism to implement similar hooks for various uses.  But I think that is the wrong way to go, because it depends on putting text properties on the text, to indicate which parts have been processed.  (Fontified, in the case of jit-lock.)

We don't want linum to put on text properties to say where it has put the line numbers.  So I think my idea of using the same hooks jit-lock uses was a mistake.

We seem to have another solution, which I suggested and Markus Triska implemened. 

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