GNU bug report logs - #15753
24.2; image-mode-hook does not exist

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

From: Tikhon Jelvis <tikhon <at> jelv.is>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2; image-mode-hook does not exist
Date: Tue, 29 Oct 2013 18:40:53 -0700

[Message part 1 (text/plain, inline)]

The variable image-mode-hook does not exist, so I can't easily add a hook
to image mode. This is using Emacs 24.2.1 on Fedora 18.

Here are the details from M-x report-emacs-bug, just in case:

In GNU Emacs 24.2.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.6.4)
 of 2013-07-14 on buildvm-05.phx2.fedoraproject.org
Windowing system distributor `Fedora Project', version 11.0.11303000
Configured using:
 `configure '--build=x86_64-redhat-linux-gnu'
 '--host=x86_64-redhat-linux-gnu' '--program-prefix='
 '--disable-dependency-tracking' '--prefix=/usr' '--exec-prefix=/usr'
 '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc'
 '--datadir=/usr/share' '--includedir=/usr/include'
 '--libdir=/usr/lib64' '--libexecdir=/usr/libexec'
 '--localstatedir=/var' '--sharedstatedir=/var/lib'
 '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--with-dbus'
 '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff'
 '--with-xft' '--with-xpm' '--with-x-toolkit=gtk3' '--with-gpm=no'
 '--with-wide-int' 'build_alias=x86_64-redhat-linux-gnu'
 'host_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
 --param=ssp-buffer-size=4 -m64 -mtune=generic' 'LDFLAGS=-Wl,-z,relro ''

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: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Image[svg]

Minor modes in effect:
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-netsplit-mode: t
  erc-hl-nicks-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  global-auto-revert-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  show-paren-mode: t
  global-auto-complete-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t

[Message part 2 (text/html, inline)]

Message #8 received at 15753 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Tikhon Jelvis <tikhon <at> jelv.is>
Cc: 15753 <at> debbugs.gnu.org
Subject: Re: bug#15753: 24.2; image-mode-hook does not exist
Date: Tue, 29 Oct 2013 22:54:41 -0400

> The variable image-mode-hook does not exist,

Hooks are not really variables.  So, yes it does exist.  It just doesn't
have a value, by default.

> so I can't easily add a hook to image mode.

To quote someone else: yes, you can.


        Stefan

Message #13 received at 15753-done <at> debbugs.gnu.org (full text, mbox):

From: Leo Liu <sdl.web <at> gmail.com>
To: Tikhon Jelvis <tikhon <at> jelv.is>
Cc: 15753-done <at> debbugs.gnu.org
Subject: Re: bug#15753: 24.2; image-mode-hook does not exist
Date: Wed, 30 Oct 2013 11:28:59 +0800

Not a bug.

On 2013-10-30 09:40 +0800, Tikhon Jelvis wrote:
> The variable image-mode-hook does not exist, so I can't easily add a hook
> to image mode. This is using Emacs 24.2.1 on Fedora 18.

Hook variables don't need to be defined before use. So just use it and
it will work.

Leo

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