From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Modernize frame-title-format: "%b - GNU Emacs"
Date: Mon, 31 Aug 2020 17:19:33 +0300
Message-ID: <83y2lux5hm.fsf@gnu.org>
References: <CADwFkmnhA7TNqVpgG3jvPL+_33gYRwSK0z2ddvDpYXUu9qw-EQ@mail.gmail.com>
 <CADwFkmk1dtqB8jjSgUHY0u0cetCUkhsDLTWF7JFT+8dxiAa3WA@mail.gmail.com>
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="10337"; mail-complaints-to="usenet@ciao.gmane.io"
Cc: emacs-devel@gnu.org
To: Stefan Kangas <stefan@marxist.se>
Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Aug 31 16:20:21 2020
Return-path: <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Envelope-to: ged-emacs-devel@m.gmane-mx.org
Original-Received: from lists.gnu.org ([209.51.188.17])
	by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1kCkfU-0002Xu-Sx
	for ged-emacs-devel@m.gmane-mx.org; Mon, 31 Aug 2020 16:20:20 +0200
Original-Received: from localhost ([::1]:36378 helo=lists1p.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.90_1)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1kCkfT-0001kQ-VF
	for ged-emacs-devel@m.gmane-mx.org; Mon, 31 Aug 2020 10:20:19 -0400
Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:34434)
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <eliz@gnu.org>) id 1kCkey-0001Kj-Et
 for emacs-devel@gnu.org; Mon, 31 Aug 2020 10:19:48 -0400
Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:56869)
 by eggs.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <eliz@gnu.org>)
 id 1kCkex-0007Or-Ne; Mon, 31 Aug 2020 10:19:47 -0400
Original-Received: from [176.228.60.248] (port=2925 helo=home-c4e4a596f7)
 by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256)
 (Exim 4.82) (envelope-from <eliz@gnu.org>)
 id 1kCkew-0004Jf-T3; Mon, 31 Aug 2020 10:19:47 -0400
In-Reply-To: <CADwFkmk1dtqB8jjSgUHY0u0cetCUkhsDLTWF7JFT+8dxiAa3WA@mail.gmail.com>
 (message from Stefan Kangas on Sun, 30 Aug 2020 16:59:39 -0700)
X-BeenThere: emacs-devel@gnu.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "Emacs development discussions." <emacs-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/emacs-devel>
List-Post: <mailto:emacs-devel@gnu.org>
List-Help: <mailto:emacs-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=subscribe>
Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org
Original-Sender: "Emacs-devel"
 <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Xref: news.gmane.io gmane.emacs.devel:254442
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/254442>

> From: Stefan Kangas <stefan@marxist.se>
> Date: Sun, 30 Aug 2020 16:59:39 -0700
> 
> I therefore suggest:
> 
>   (setq frame-title-format
>         '(multiple-frames "%B"
>                           ("" "%B - GNU Emacs at " system-name))
> 
> The main new feature is that we will show the current buffer or file
> name in the frame title, even when there is only one frame.
> 
> The new "%B" specifier, added by me here, is equivalent to:
> 
>   (if buffer-file-name
>       (abbreviate-file-name buffer-file-name)
>     buffer-name))

The display engine calls the function which produces the frame's title
very frequently.  You have just made redisplay much slower due to this
call (abbreviate-file-name is a large and complex function, and you
call Lisp on top of that), and caused most redisplay cycles prfoduce
more garbage.  Is it really worth it?