bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

[Tassilo Horn]

When using `rcirc-track-minor-mode', the mode line contains an activity
indicator like

  [#e,#gnus,#gnu]

that tells users that there's been activity in #emacs, #gnus, and #gnu
since they've last visited those buffers.  Once you switch to, say, the
#emacs rcirc buffer, the #e indicator is removed again.

However, since quite some time, the activity indicator is cleared
periodically without me switching to the channel buffers.  That is, the
one second I have the activity above, the next second it's [] again,
meaning there hasn't been any activity.

I've verified that I get that behavior also with emacs -Q and only a
minimal rcirc config, e.g., setting my `rcirc-default-nick' etc.
However, with emacs -Q the clearing happens way fewer than with my
normal emacs with dozens of packages loaded.

If you give me some hints on how to debug that, I'm happy to do whatever
you want me to do.



In GNU Emacs 24.3.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.8.6)
 of 2013-10-21 on tsdh
Bzr revision: dgutov@yandex.ru-20131021061547-ppqioz0w4dd5b5sm
Windowing system distributor `The X.Org Foundation', version 11.0.11403000
System Description:	NAME=Gentoo

Configured using:
 `configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --libdir=/usr/lib64 --disable-silent-rules
 --disable-dependency-tracking --program-suffix=-emacs-24-vcs
 --infodir=/usr/share/info/emacs-24-vcs
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --with-gameuser=games --without-compress-info
 --with-file-notification=inotify --disable-acl --with-dbus
 --with-gnutls --with-gpm --without-hesiod --without-kerberos
 --without-kerberos5 --with-xml2 --without-selinux --without-wide-int
 --with-zlib --with-sound=alsa --with-x --without-ns --without-gconf
 --with-gsettings --with-toolkit-scroll-bars --with-gif --with-jpeg
 --with-png --with-rsvg --with-tiff --with-xpm --with-imagemagick
 --with-xft --with-libotf --with-m17n-flt --with-x-toolkit=gtk3
 GENTOO_PACKAGE=app-editors/emacs-vcs-24.3.9999 EBZR_BRANCH=trunk
 EBZR_REVNO=114733 'CFLAGS=-march=native -pipe -g3 -ggdb' CPPFLAGS=
 'LDFLAGS=-Wl,-O1 -Wl,--as-needed''

Important settings:
  value of $LC_COLLATE: C
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: rcirc

Minor modes in effect:
  rcirc-track-minor-mode: t
  global-company-mode: t
  shell-dirtrack-mode: t
  global-edit-server-edit-mode: t
  recentf-mode: t
  helm-occur-match-plugin-mode: t
  global-subword-mode: t
  subword-mode: t
  savehist-mode: t
  show-paren-mode: t
  icomplete-mode: t
  minibuffer-depth-indicate-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  use-hard-newlines: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x p a c k <tab> l i s <tab> <return> U x y <help-echo> 
<help-echo> <help-echo> y <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> q M-x 
g n u s <return> <escape> <escape> <escape> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <return> $ q <return> c <return> c <return> 
$ $ q <return> c l s <return> c <return> c <return> 
c <return> c <return> C-n SPC <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <up> 
c l s <up> <up> <up> <up> <return> B <backspace> q 
l s M-x r c i r <tab> <return> C-c C-SPC C-c C-SPC 
M-x d e b b <tab> - s <tab> <return> r c i r c SPC 
t r a c k <return> <return> <return> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> C-e C-a <down> <return> 
<return> <return> <return> <down> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <down> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <down> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <down> <return> 
<down> <return> c q M-x r c i r <tab> - b <tab> <tab> 
C-g M-x r e p o <tab> <return>

Recent messages:
Connecting to irc.gnome.org...done
Connecting to irc.gimp.org...
Rcirc-Omit mode enabled
Connecting to irc.gimp.org...done
Rcirc-Omit mode enabled [19 times]
Contacting host: debbugs.gnu.org:80 [3 times]
Wrote /tmp/gnus-temp-group-3372xMs
20131023T095720.854> Opening nndoc server on /tmp/gnus-temp-group-3372xMs-ephemeral...
20131023T095720.854> Opening nndoc server on /tmp/gnus-temp-group-3372xMs-ephemeral...done
20131023T095902.246> Exiting summary buffer and applying spam rules
Quit

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Features:
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gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int gnus-range
gnus-win gnus gnus-ems gnus-compat nnheader google-contacts xml
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url-cookie url-domsuf mailcap url-util url-parse auth-source eieio
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helm-elscreen helm-utils dired compile comint ansi-color ring helm
helm-config helm-aliases uniquify multiple-cursors
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x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list
newcomment lisp-mode prog-mode register page menu-bar rfn-eshadow timer
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frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
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custom widget hashtable-print-readable backquote make-network-process
dbusbind inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)

bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

[Leo Liu]

On 2013-10-23 16:18 +0800, Tassilo Horn wrote:
> I've verified that I get that behavior also with emacs -Q and only a
> minimal rcirc config, e.g., setting my `rcirc-default-nick' etc.
> However, with emacs -Q the clearing happens way fewer than with my
> normal emacs with dozens of packages loaded.
>
> If you give me some hints on how to debug that, I'm happy to do whatever
> you want me to do.

I am using rcirc on emacs 24.3 and never had this problem. Could you
check if something modifies rcirc-activity-string?

Leo

bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

[Tassilo Horn]

Leo Liu <sdl.web@gmail.com> writes:

Hi Leo,

>> I've verified that I get that behavior also with emacs -Q and only a
>> minimal rcirc config, e.g., setting my `rcirc-default-nick' etc.
>> However, with emacs -Q the clearing happens way fewer than with my
>> normal emacs with dozens of packages loaded.
>>
>> If you give me some hints on how to debug that, I'm happy to do
>> whatever you want me to do.
>
> I am using rcirc on emacs 24.3 and never had this problem. Could you
> check if something modifies rcirc-activity-string?

The only function doing that in rcirc should be
`rcirc-update-activity-string'.  So I've edebugged that, but sometimes
it occurs that the activity string changes without me being put in the
debugger.

Is there a way to be put into the debugger whenever a variable is set,
no matter what function does it?

Bye,
Tassilo

bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

[Stefan Monnier]

> The only function doing that in rcirc should be
> `rcirc-update-activity-string'.  So I've edebugged that, but sometimes
> it occurs that the activity string changes without me being put in the
> debugger.

Better put a `message' in there, in case the function is called from
a context where debugging is inhibited (e.g. redisplay).

> Is there a way to be put into the debugger whenever a variable is set,
> no matter what function does it?

No.  It wouldn't be very hard to add, tho.


        Stefan

bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

[Tassilo Horn]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> The only function doing that in rcirc should be
>> `rcirc-update-activity-string'.  So I've edebugged that, but
>> sometimes it occurs that the activity string changes without me being
>> put in the debugger.
>
> Better put a `message' in there, in case the function is called from a
> context where debugging is inhibited (e.g. redisplay).

Ok, within a few minutes and without ever switching to any of the rcirc
buffers, I get

Setting rcirc-activity-string from [] to [#git].
Setting rcirc-activity-string from [#git] to [].
Setting rcirc-activity-string from [] to [#git].
Setting rcirc-activity-string from [#git] to [].
Setting rcirc-activity-string from [] to [#git].
Setting rcirc-activity-string from [#git] to [].
Setting rcirc-activity-string from [] to [#git].
Setting rcirc-activity-string from [#git] to [].
Setting rcirc-activity-string from [] to [#git].
Setting rcirc-activity-string from [#git] to [].
Setting rcirc-activity-string from [] to [#ema].
Setting rcirc-activity-string from [#ema] to [#git,#ema].
Setting rcirc-activity-string from [#git,#ema] to [].

The switches from [<something>] to [] should never have happened.

Hm, debugging a bit further, the problem is that `rcirc-activity' is
already wrong, i.e., it's oftentimes set to nil although there should
still be buffers with unseen activity.  So then I tried to edebug
`rcirc-record-activity', and I got an error about a void-function
`pushnew'.  I guess that edebugging interprets the function, so pushnew
is undefined because cl was only required at compile-time.  Ok, now I
did (require 'cl)...

I also added a message in there plus a (debug) when rcirc-activity turns
nil, but of course since I've done that it's working properly for a much
too long time...  Really strange.  Is there any chance that the bug
occurs only in compiled code?

>> Is there a way to be put into the debugger whenever a variable is
>> set, no matter what function does it?
>
> No.  It wouldn't be very hard to add, tho.

It's definititely not the first time where I could need something like
that.  Maybe it could also be a bit more general, e.g., one could add a
watcher function to a symbol that's called whenever the symbol-value is
set.

Bye,
Tassilo

bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

[Tassilo Horn]

Tassilo Horn <tsdh@gnu.org> writes:

> I also added a message in there plus a (debug) when rcirc-activity
> turns nil, but of course since I've done that it's working properly
> for a much too long time...  Really strange.  Is there any chance that
> the bug occurs only in compiled code?

It really seems so.  To be sure I've restarted emacs, turned on rcirc,
and then the activity indicator frequently switched back to [] (i.e.,
rcirc-activity was somehow switched to nil) as I've reported.

But as soon as I evaluate the definition of `rcirc-record-activity'
using C-x C-e, the resetting of `rcirc-activity' to nil doesn't happen
anymore.  That's absolutely reproducible.

Bye,
Tassilo

bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

[Stefan Monnier]

>> No.  It wouldn't be very hard to add, tho.
> It's definititely not the first time where I could need something like
> that.  Maybe it could also be a bit more general, e.g., one could add a
> watcher function to a symbol that's called whenever the symbol-value is
> set.

The way to implement it, I think is to take the "read-only" bit of
symbols, and extend it with a third value ("watched").
So assignment to such a variable would be a variation of "read-only",
except that instead of signally an error, it would call some Elisp code.
The point being that the "normal execution path" can stay unchanged, so
we don't slow down normal execution.

Of course, it wouldn't work on those Elisp variable that are defined in
C (i.e. defined via DEFVAR_LISP, DEFVAR_BOOL, or DEFVAR_INT), where the
value can be directly changed by the C code without going through
those tests.  Kind of like advice on subrs.


        Stefan

bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

[Stefan Monnier]

> But as soon as I evaluate the definition of `rcirc-record-activity'
> using C-x C-e, the resetting of `rcirc-activity' to nil doesn't happen
> anymore.  That's absolutely reproducible.

Indeed, there was an error in the compiler-macro of add-to-list which
caused it to return the wrong value (it is rare for code to use the
return value of add-to-list, but the docstring documents it all too
clearly).
Should be fixed now (tho you'll have to recompile rcirc.el after
recompiling subr.el and rebuilding emacs).


        Stefan

bug#15692: 24.3.50; rcirc activity mode-line indicator gets cleared automatically

[Tassilo Horn]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> But as soon as I evaluate the definition of `rcirc-record-activity'
>> using C-x C-e, the resetting of `rcirc-activity' to nil doesn't
>> happen anymore.  That's absolutely reproducible.
>
> Indeed, there was an error in the compiler-macro of add-to-list which
> caused it to return the wrong value (it is rare for code to use the
> return value of add-to-list, but the docstring documents it all too
> clearly).

I see.

> Should be fixed now (tho you'll have to recompile rcirc.el after
> recompiling subr.el and rebuilding emacs).

I did so, and I confirm the problem is gone.  Thanks a lot!

Bye,
Tassilo