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* question about "Making change-major-mode-hook buffer-local while locally let-bound!"
@ 2010-06-20 16:51 Drew Adams
  2010-06-20 18:31 ` question about "Making change-major-mode-hook buffer-local whilelocally let-bound!" Drew Adams
                   ` (2 more replies)
  0 siblings, 3 replies; 10+ messages in thread
From: Drew Adams @ 2010-06-20 16:51 UTC (permalink / raw)
  To: emacs-devel

I use a modified definition of `pp-display-expression' that binds these two
hooks to nil around the call (emacs-lisp-mode), to prevent the hooks from
running:

(let ((emacs-lisp-mode-hook    nil)
      (change-major-mode-hook  nil))
  (emacs-lisp-mode))

That is the only change - otherwise, emacs -Q.

(No, I do not remember just why I added the c-m-m-h binding (years ago), but I
probably did so because of some problem or annoyance the hook sometimes caused.)

The c-m-m-h binding now results in this message being displayed:

"Making change-major-mode-hook buffer-local while locally let-bound!"

Question:
What is the right way to prevent these hooks from running here?

Do I need to use remove-hook followed by add-hook: saving, emptying and
repopulating the hook? What's the right approach?

---

Also, out of curiosity, where is `change-major-mode-hook' being made
buffer-local?  Grepping the lisp sources shows only these hits that seem to
involve making it local:

gnus/gnus-msg.el:449: (gnus-make-local-hook 'change-major-mode-hook)
arc-mode.el:771: (set (make-local-variable 'change-major-mode-hook)
'archive-desummarize)

But arc* and gnus* are not present in `features'.  A wild guess suggests maybe
something in font-lock is the culprit (emacs -Q shows `(font-lock-change-mode
t)' as the local value), but I haven't found anything.  I didn't find anything
by skimming the C code either.

GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2010-06-14 on 3249CTO




^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2010-06-22  5:44 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-06-20 16:51 question about "Making change-major-mode-hook buffer-local while locally let-bound!" Drew Adams
2010-06-20 18:31 ` question about "Making change-major-mode-hook buffer-local whilelocally let-bound!" Drew Adams
2010-06-20 20:56   ` Davis Herring
2010-06-20 21:24     ` Drew Adams
2010-06-20 23:15 ` question about "Making change-major-mode-hook buffer-local while locally let-bound!" Johan Bockgård
2010-06-20 23:29   ` question about "Making change-major-mode-hook buffer-localwhile " Drew Adams
2010-06-22  0:28 ` question about "Making change-major-mode-hook buffer-local while " Stefan Monnier
2010-06-22  4:10   ` Drew Adams
2010-06-22  5:01     ` Davis Herring
2010-06-22  5:44       ` Drew Adams

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