GNU bug report logs - #7492
23.2; cl loop over the windows: infinite loop, info doc

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 23.2; cl loop over the windows: infinite loop, info doc
Date: Fri, 26 Nov 2010 21:38:16 +0100

In GNU Emacs 23.2.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2010-08-14 on raven, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
configured using `configure  '--build' 'i486-linux-gnu' '--build' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.2/leim' '--with-x=yes' '--with-x-toolkit=lucid' '--with-toolkit-scroll-bars' '--without-gconf' 'build_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''

Hello,

if you evaluate the following sexp in Emacs -Q, you get an infinitive
loop:

(progn
  (require 'cl)
  (select-window (minibuffer-window))
  (loop for win being the windows do 'nothing))

This should be fixed.


Moreover, the "CL" info manual should be clarified here:
  (cl)Top > Control Structure > Loop Facility > For Clauses

For looping over "the windows", it only says:

`for VAR being the windows [of FRAME]'
     This clause iterates over the windows (in the Emacs sense) of the
     current frame, or of the specified FRAME.

It's not clear if/when the minibuffer window is included and in which
order the iteration is done.

Message #8 received at 7492 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: michael_heerdegen <at> web.de
Cc: 7492 <at> debbugs.gnu.org
Subject: Re: bug#7492: 23.2; cl loop over the windows: infinite loop, info doc
Date: Mon, 29 Nov 2010 19:29:26 -0500

Michael Heerdegen wrote:

> For looping over "the windows", it only says:
>
> `for VAR being the windows [of FRAME]'
>      This clause iterates over the windows (in the Emacs sense) of the
>      current frame, or of the specified FRAME.
>
> It's not clear if/when the minibuffer window is included and in which
> order the iteration is done.

By experiment, the minibuffer is not included, which is why it loops
forever if you force it to start there. Does the order matter? Anyway,
it's the order that `next-window' gives.

`loop' can probably be improved, but I suggest using `walk-windows'
(which has well-defined, flexible behaviour wrt the minibuffer)
instead and will add a note to cl.texi to this effect.

Message #13 received at 7492-done <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: 7492-done <at> debbugs.gnu.org
Subject: Re: bug#7492: 23.2; cl loop over the windows: infinite loop, info doc
Date: Thu, 02 Dec 2010 12:47:40 -0500

Version: 24.1

Fixed the manual in 23.3; fixed the infinite loop in 24.1.

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