bug#4366: 23.1; Can't turn off visual-line-mode via html-mode-hook

bug#4366: 23.1; Can't turn off visual-line-mode via html-mode-hook

[Allan Gottlieb]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the bug-gnu-emacs@gnu.org mailing list,
and to the gnu.emacs.bug news group.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Have /tmp/fun.el contain
(defun visual-off-fill-on ()
  "For html, turn OFF visual-line-mode and turn-ON auto fill"
  (visual-line-mode 0)
  (auto-fill-mode 1))

Start emacs -Q
(load-file "/tmp/fun.el")
(global-visual-line-mode)
(add-hook 'html-mode-hook 'visual-off-fill-on)
(find-file "/tmp/x.html")   ; non-existent file

mode line shows fill as expected, but also shows wrap, the bug.

However, if one does instead

Start emacs -Q
(load-file "/tmp/fun.el")
(global-visual-line-mode)
(find-file "/tmp/x.html")   ; non-existent file
(visual-off-fill-on)

then all is well (mode line shows fill and not wrap).

thanks for emacs,
allan

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.1/etc/DEBUG for instructions.


In GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.14.7)
 of 2009-08-17 on ajglap
Windowing system distributor `The X.Org Foundation', version 11.0.10503000
configured using `configure  '--prefix=/usr' '--build=i686-pc-linux-gnu' '--host=i686-pc-linux-gnu' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' '--localstatedir=/var/lib' '--program-suffix=-emacs-23' '--infodir=/usr/share/info/emacs-23' '--with-sound' '--with-x' '--with-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png' '--without-rsvg' '--with-tiff' '--with-xpm' '--with-xft' '--without-libotf' '--without-m17n-flt' '--with-x-toolkit=gtk' '--without-hesiod' '--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus' 'build_alias=i686-pc-linux-gnu' 'host_alias=i686-pc-linux-gnu' 'CFLAGS=-O2 -march=prescott -pipe' 'LDFLAGS=-Wl,-O1''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  gnus-mailing-list-mode: t
  iswitchb-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
. <return> <return> I SPC p l a n SPC o n SPC s u b 
<backspace> <backspace> <backspace> f i l l <backspace> 
i n g SPC a SPC b u g SPC r e p o r t SPC u n l e s 
s SPC s o m e o n e SPC e x p l a i n s SPC <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> . <return> 
<return> <help-echo> <down-mouse-1> <mouse-1> <double-down-mouse-1> 
<double-mouse-1> <triple-down-mouse-1> <mouse-movement> 
<mouse-movement> <triple-drag-mouse-1> <help-echo> 
<down-mouse-1> <mouse-1> a l l a n <return> C-c C-c 
<help-echo> <help-echo> M-x r e p o r t - e m a c s 
- u <backspace> b u g <return> c a n t <backspace> 
' t SPC t u r n SPC v i s u a l - l i n e - m o d e 
SPC o f f SPC v i a SPC h t m l - m o d e - h o o k 
<help-echo> <select-window> <down-mouse-1> <mouse-1> 
C-x b <help-echo> C-x o C-x o C-x b i n f o <return> 
u u <up> <up> <up> <return> <down> <down> <down> <down> 
<down> <down> <down> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <return> C-s h t m l C-g <next> 
<next> <next> <next> <next> <next> <next> <next> <next> 
<next> q <select-window> <help-echo> <select-window> 
<help-echo> <select-window> <help-echo> <select-window> 
M-x r e p o r t - e m a c s - b u g <return> C-g C-x 
b C-s b u C-g M-x r e p o r t - e m a c s - b u g 
<return>

Recent messages:
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bug#4366: 23.1; Can't turn off visual-line-mode via html-mode-hook

[Juanma Barranquero]

On Mon, Sep 7, 2009 at 16:14, Allan Gottlieb <gottlieb@nyu.edu> wrote:

> Start emacs -Q
> (load-file "/tmp/fun.el")
> (global-visual-line-mode)
> (add-hook 'html-mode-hook 'visual-off-fill-on)
> (find-file "/tmp/x.html")   ; non-existent file
>
> mode line shows fill as expected, but also shows wrap, the bug.
>
> However, if one does instead
>
> Start emacs -Q
> (load-file "/tmp/fun.el")
> (global-visual-line-mode)
> (find-file "/tmp/x.html")   ; non-existent file
> (visual-off-fill-on)
>
> then all is well (mode line shows fill and not wrap).

That is not a bug. When you do (global-visual-line-mode)  [which
should better be (global-visual-line-mode 1), BTW], the function adds
code to several hooks to check for new buffers (find-file-hook, etc.).

In your first case, the global mode is active (so the hooks are
active); when you run find-file, it creates the buffer, runs
html-mode-hook (disabling visual-line-mode), and finally a hook is run
which activates the mode.

In the second case, you activate the global mode, run find-file (and
the hooks check that visual mode is active, so do nothing), and
finally run visual-off-fill-on, deactivating the visual-line mode.

If you want to deactivate the mode automatically after find-file,
there are several ways, like an `after' advice for find-file, or
adding code to the relevant hooks, etc.

    Juanma

bug#4366: 23.1; Can't turn off visual-line-mode via html-mode-hook

[Lennart Borgman]

On Fri, Jan 8, 2010 at 5:12 AM, Juanma Barranquero <lekktu@gmail.com> wrote:
> On Mon, Sep 7, 2009 at 16:14, Allan Gottlieb <gottlieb@nyu.edu> wrote:
>
>> Start emacs -Q
>> (load-file "/tmp/fun.el")
>> (global-visual-line-mode)
>> (add-hook 'html-mode-hook 'visual-off-fill-on)
>> (find-file "/tmp/x.html")   ; non-existent file
>>
>> mode line shows fill as expected, but also shows wrap, the bug.
>>
>> However, if one does instead
>>
>> Start emacs -Q
>> (load-file "/tmp/fun.el")
>> (global-visual-line-mode)
>> (find-file "/tmp/x.html")   ; non-existent file
>> (visual-off-fill-on)
>>
>> then all is well (mode line shows fill and not wrap).
>
> That is not a bug. When you do (global-visual-line-mode)  [which
> should better be (global-visual-line-mode 1), BTW], the function adds
> code to several hooks to check for new buffers (find-file-hook, etc.).
>
> In your first case, the global mode is active (so the hooks are
> active); when you run find-file, it creates the buffer, runs
> html-mode-hook (disabling visual-line-mode), and finally a hook is run
> which activates the mode.
>
> In the second case, you activate the global mode, run find-file (and
> the hooks check that visual mode is active, so do nothing), and
> finally run visual-off-fill-on, deactivating the visual-line mode.
>
> If you want to deactivate the mode automatically after find-file,
> there are several ways, like an `after' advice for find-file, or
> adding code to the relevant hooks, etc.


Hm, maybe someone wants to make a picture that quickly describes the
order of the hooks. That would be useful IMO.

bug#4366: 23.1; Can't turn off visual-line-mode via html-mode-hook

[Stefan Monnier]

> That is not a bug.

Well, that's debatable.  It's clearly not a feature, but admittedly,
I do not know how to implement such global minor modes in a way that
doesn't suffer from this problem.


        Stefan

bug#4366: 23.1; Can't turn off visual-line-mode via html-mode-hook

[Juanma Barranquero]

> Well, that's debatable.  It's clearly not a feature, but admittedly,
> I do not know how to implement such global minor modes in a way that
> doesn't suffer from this problem.

We agree, I think: it's not a feature, nor a bug. It's an
epiphenomenon of the current implementation of global minor modes.

    Juanma

bug#4366: 23.1; Can't turn off visual-line-mode via html-mode-hook

[Lennart Borgman]

On Fri, Jan 8, 2010 at 6:34 PM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>> That is not a bug.
>
> Well, that's debatable.  It's clearly not a feature, but admittedly,
> I do not know how to implement such global minor modes in a way that
> doesn't suffer from this problem.


Couldn't it be handled better for derived modes at least?

bug#4366: 23.1; Can't turn off visual-line-mode via

[Stefan Monnier]

>>> That is not a bug.
>> Well, that's debatable.  It's clearly not a feature, but admittedly,
>> I do not know how to implement such global minor modes in a way that
>> doesn't suffer from this problem.
> Couldn't it be handled better for derived modes at least?

You mean for major modes which follow a particular convention
(convention which could be automatically enforced by
define-derived-mode)?

That would be good, yes,


        Stefan

bug#4366: marked as done (23.1; Can't turn off visual-line-mode via html-mode-hook)

[Emacs bug Tracking System]

[-- Attachment #1: Type: text/plain, Size: 902 bytes --]

Your message dated Fri, 8 Jan 2010 10:30:22 +0100
with message-id <f7ccd24b1001080130v1b32901fu663da50659140c2b@mail.gmail.com>
and subject line Re: bug#4366: 23.1; Can't turn off visual-line-mode via  html-mode-hook
has caused the Emacs bug report #4366,
regarding 23.1; Can't turn off visual-line-mode via html-mode-hook
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact bug-gnu-emacs@gnu.org
immediately.)


-- 
4366: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4366
Emacs Bug Tracking System
Contact bug-gnu-emacs@gnu.org with problems

[-- Attachment #2: Type: message/rfc822, Size: 6975 bytes --]

From: Allan Gottlieb <gottlieb@nyu.edu>
To: bug-gnu-emacs@gnu.org
Subject: 23.1; Can't turn off visual-line-mode via html-mode-hook
Date: Mon, 07 Sep 2009 11:14:45 -0400
Message-ID: <yu94oreaisa.fsf@nyu.edu>


Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the bug-gnu-emacs@gnu.org mailing list,
and to the gnu.emacs.bug news group.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Have /tmp/fun.el contain
(defun visual-off-fill-on ()
  "For html, turn OFF visual-line-mode and turn-ON auto fill"
  (visual-line-mode 0)
  (auto-fill-mode 1))

Start emacs -Q
(load-file "/tmp/fun.el")
(global-visual-line-mode)
(add-hook 'html-mode-hook 'visual-off-fill-on)
(find-file "/tmp/x.html")   ; non-existent file

mode line shows fill as expected, but also shows wrap, the bug.

However, if one does instead

Start emacs -Q
(load-file "/tmp/fun.el")
(global-visual-line-mode)
(find-file "/tmp/x.html")   ; non-existent file
(visual-off-fill-on)

then all is well (mode line shows fill and not wrap).

thanks for emacs,
allan

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.1/etc/DEBUG for instructions.


In GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.14.7)
 of 2009-08-17 on ajglap
Windowing system distributor `The X.Org Foundation', version 11.0.10503000
configured using `configure  '--prefix=/usr' '--build=i686-pc-linux-gnu' '--host=i686-pc-linux-gnu' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' '--localstatedir=/var/lib' '--program-suffix=-emacs-23' '--infodir=/usr/share/info/emacs-23' '--with-sound' '--with-x' '--with-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png' '--without-rsvg' '--with-tiff' '--with-xpm' '--with-xft' '--without-libotf' '--without-m17n-flt' '--with-x-toolkit=gtk' '--without-hesiod' '--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus' 'build_alias=i686-pc-linux-gnu' 'host_alias=i686-pc-linux-gnu' 'CFLAGS=-O2 -march=prescott -pipe' 'LDFLAGS=-Wl,-O1''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  gnus-mailing-list-mode: t
  iswitchb-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
. <return> <return> I SPC p l a n SPC o n SPC s u b 
<backspace> <backspace> <backspace> f i l l <backspace> 
i n g SPC a SPC b u g SPC r e p o r t SPC u n l e s 
s SPC s o m e o n e SPC e x p l a i n s SPC <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> . <return> 
<return> <help-echo> <down-mouse-1> <mouse-1> <double-down-mouse-1> 
<double-mouse-1> <triple-down-mouse-1> <mouse-movement> 
<mouse-movement> <triple-drag-mouse-1> <help-echo> 
<down-mouse-1> <mouse-1> a l l a n <return> C-c C-c 
<help-echo> <help-echo> M-x r e p o r t - e m a c s 
- u <backspace> b u g <return> c a n t <backspace> 
' t SPC t u r n SPC v i s u a l - l i n e - m o d e 
SPC o f f SPC v i a SPC h t m l - m o d e - h o o k 
<help-echo> <select-window> <down-mouse-1> <mouse-1> 
C-x b <help-echo> C-x o C-x o C-x b i n f o <return> 
u u <up> <up> <up> <return> <down> <down> <down> <down> 
<down> <down> <down> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <return> C-s h t m l C-g <next> 
<next> <next> <next> <next> <next> <next> <next> <next> 
<next> q <select-window> <help-echo> <select-window> 
<help-echo> <select-window> <help-echo> <select-window> 
M-x r e p o r t - e m a c s - b u g <return> C-g C-x 
b C-s b u C-g M-x r e p o r t - e m a c s - b u g 
<return>

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[-- Attachment #3: Type: message/rfc822, Size: 3209 bytes --]

From: Juanma Barranquero <lekktu@gmail.com>
To: Lennart Borgman <lennart.borgman@gmail.com>
Cc: 4366-done@debbugs.gnu.org, Allan Gottlieb <gottlieb@nyu.edu>
Subject: Re: bug#4366: 23.1; Can't turn off visual-line-mode via  html-mode-hook
Date: Fri, 8 Jan 2010 10:30:22 +0100
Message-ID: <f7ccd24b1001080130v1b32901fu663da50659140c2b@mail.gmail.com>

tags 4366  + notabug
quit

On Fri, Jan 8, 2010 at 08:04, Lennart Borgman <lennart.borgman@gmail.com> wrote:

> Hm, maybe someone wants to make a picture that quickly describes the
> order of the hooks. That would be useful IMO.

All hooks? That's quite a task.

    Juanma