From: Alan Mackenzie <acm@muc.de>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: "Chong Yidong" <cyd@gnu.org>,
emacs-devel@gnu.org, "João Távora" <joaotavora@gmail.com>,
"Leo Liu" <sdl.web@gmail.com>
Subject: Re: Redundant (harmful) duplication of run-hooks in define-globalized-minor-mode [patch-2]
Date: Thu, 31 Jan 2013 11:04:04 +0000 [thread overview]
Message-ID: <20130131110404.GA3459@acm.acm> (raw)
In-Reply-To: <jwv4nifbrol.fsf-monnier+emacs@gnu.org>
Hi, Stefan.
On Thu, Jan 17, 2013 at 01:31:32PM -0500, Stefan Monnier wrote:
[Note: this discussion is relevant to bug#11152.]
> The issue is how to locally turn off the globalized minor mode from
> a major-mode hook. If the globalized mode is enabled after the
> major-mode hook, you basically can't do it without resorting to
> ugly gymnastics.
> I'm not completely sure what happens (and what should happen instead) in
> your scenario, but for the case described by João, where you don't just
> want to disable it in some modes, but you want to prevent it from ever
> being enabled in such modes, obviously the current approach
> fails similarly.
> A simple solution is to activate the minor mode late, and provide
> a `disable-foo-mode' variable, that can be set in the major mode hook.
> But it's kind of ugly because it requires another var and the user needs
> to know about that magic var.
> Maybe we could do it this way:
> for a globalized minor mode `foo', before running the major-mode hook, a magic
> `disable-foo-mode' is set to nil. A function is added to `foo-mode-hook'
> which sets this var to t when foo-mode is disabled. And after running
> the major-mode hook, the globalized minor mode code checks the magic var
> to decide whether to enable the minor mode.
OK, I've bitten the bullet. Please see my patch below, which implements
this precisely. It seems to work, in that:
(i) It fixes #11152 - the new global-font-lock-mode calls font-lock-mode
_after_ the major mode hook.
(ii) Should the major mode hook do (font-lock-mode -1), this isn't
overridden by global mode.
> This way, the user doesn't need to know about the extra magic var; she
> can just call (foo-mode -1) in her major-mode hook as she can now, but
> the minor-mode is really only activated late.
> It's also kind of ugly because of all the magic, but it's the best I can
> come up with so far.
Here's the patch, based on easy-mmode.el in the emacs-24 branch:
=== modified file 'lisp/emacs-lisp/easy-mmode.el'
*** lisp/emacs-lisp/easy-mmode.el 2013-01-01 09:11:05 +0000
--- lisp/emacs-lisp/easy-mmode.el 2013-01-31 10:13:51 +0000
***************
*** 340,348 ****
enabled, then disabling and reenabling MODE should make MODE work
correctly with the current major mode. This is important to
prevent problems with derived modes, that is, major modes that
! call another major mode in their body."
(declare (doc-string 2))
(let* ((global-mode-name (symbol-name global-mode))
(pretty-name (easy-mmode-pretty-mode-name mode))
(pretty-global-name (easy-mmode-pretty-mode-name global-mode))
(group nil)
--- 340,353 ----
enabled, then disabling and reenabling MODE should make MODE work
correctly with the current major mode. This is important to
prevent problems with derived modes, that is, major modes that
! call another major mode in their body.
!
! MODE is actually turned on when a major mode is initialized, just
! after running the major mode's hook. However, MODE is not turned
! on, should the hook explicitly disable it."
(declare (doc-string 2))
(let* ((global-mode-name (symbol-name global-mode))
+ (mode-name (symbol-name mode))
(pretty-name (easy-mmode-pretty-mode-name mode))
(pretty-global-name (easy-mmode-pretty-mode-name global-mode))
(group nil)
***************
*** 353,358 ****
--- 358,369 ----
(MODE-check-buffers
(intern (concat global-mode-name "-check-buffers")))
(MODE-cmhh (intern (concat global-mode-name "-cmhh")))
+ (MODE-cancel-disable
+ (intern (concat global-mode-name "-cancel-disable")))
+ (MODE-disable-in-buffer
+ (intern (concat global-mode-name "-disable-in-buffer")))
+ (minor-MODE-hook (intern (concat mode-name "-hook")))
+ (disable-MODE (intern (concat "disable-" mode-name)))
(MODE-major-mode (intern (concat (symbol-name mode) "-major-mode")))
keyw)
***************
*** 397,403 ****
(add-hook 'after-change-major-mode-hook
',MODE-enable-in-buffers)
(add-hook 'change-major-mode-after-body-hook
! ',MODE-enable-in-buffers)
(add-hook 'find-file-hook ',MODE-check-buffers)
(add-hook 'change-major-mode-hook ',MODE-cmhh))
(remove-hook 'after-change-major-mode-hook ',MODE-enable-in-buffers)
--- 408,414 ----
(add-hook 'after-change-major-mode-hook
',MODE-enable-in-buffers)
(add-hook 'change-major-mode-after-body-hook
! ',MODE-cancel-disable)
(add-hook 'find-file-hook ',MODE-check-buffers)
(add-hook 'change-major-mode-hook ',MODE-cmhh))
(remove-hook 'after-change-major-mode-hook ',MODE-enable-in-buffers)
***************
*** 415,420 ****
--- 426,435 ----
;; up-to-here.
:autoload-end
+ ;; A function which checks whether MODE has been disabled in the major
+ ;; mode hook which has just been run.
+ (add-hook ',minor-MODE-hook ',MODE-disable-in-buffer)
+
;; List of buffers left to process.
(defvar ,MODE-buffers nil)
***************
*** 423,436 ****
(dolist (buf ,MODE-buffers)
(when (buffer-live-p buf)
(with-current-buffer buf
! (unless (eq ,MODE-major-mode major-mode)
! (if ,mode
! (progn
! (,mode -1)
! (,turn-on)
! (setq ,MODE-major-mode major-mode))
! (,turn-on)
! (setq ,MODE-major-mode major-mode)))))))
(put ',MODE-enable-in-buffers 'definition-name ',global-mode)
(defun ,MODE-check-buffers ()
--- 438,452 ----
(dolist (buf ,MODE-buffers)
(when (buffer-live-p buf)
(with-current-buffer buf
! (if ,disable-MODE
! (if ,mode (,mode -1))
! (unless (eq ,MODE-major-mode major-mode)
! (if ,mode
! (progn
! (,mode -1)
! (,turn-on))
! (,turn-on))))
! (setq ,MODE-major-mode major-mode)))))
(put ',MODE-enable-in-buffers 'definition-name ',global-mode)
(defun ,MODE-check-buffers ()
***************
*** 443,449 ****
(defun ,MODE-cmhh ()
(add-to-list ',MODE-buffers (current-buffer))
(add-hook 'post-command-hook ',MODE-check-buffers))
! (put ',MODE-cmhh 'definition-name ',global-mode))))
;;;
;;; easy-mmode-defmap
--- 459,473 ----
(defun ,MODE-cmhh ()
(add-to-list ',MODE-buffers (current-buffer))
(add-hook 'post-command-hook ',MODE-check-buffers))
! (put ',MODE-cmhh 'definition-name ',global-mode)
! (defvar ,disable-MODE nil)
! (defun ,MODE-cancel-disable ()
! (setq ,disable-MODE nil))
! (put ',MODE-cancel-disable 'definition-name ',global-mode)
! (defun ,MODE-disable-in-buffer ()
! (unless ,mode
! (setq ,disable-MODE t)))
! (put ',MODE-disable-in-buffer 'definition-name ',global-mode))))
;;;
;;; easy-mmode-defmap
> Stefan
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2013-01-31 11:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-13 19:28 Redundant (harmful) duplication of run-hooks in define-globalized-minor-mode Alan Mackenzie
2013-01-13 20:48 ` Dmitry Gutov
2013-01-14 16:30 ` Redundant (harmful) duplication of run-hooks in define-globalized-minor-mode [patch] Alan Mackenzie
2013-01-14 16:52 ` emacs24/auctex bug Camm Maguire
2013-01-14 23:58 ` Xue Fuqiao
2013-01-15 2:12 ` Redundant (harmful) duplication of run-hooks in define-globalized-minor-mode [patch] Stefan Monnier
2013-01-15 14:08 ` Alan Mackenzie
2013-01-17 13:17 ` João Távora
2013-01-17 17:51 ` Alan Mackenzie
2013-01-17 18:31 ` Stefan Monnier
2013-01-18 12:07 ` João Távora
2013-01-18 17:09 ` Alan Mackenzie
2013-01-31 11:04 ` Alan Mackenzie [this message]
2013-01-31 14:38 ` Redundant (harmful) duplication of run-hooks in define-globalized-minor-mode [patch-2] Stefan Monnier
2013-02-01 15:44 ` Alan Mackenzie
2013-02-01 16:28 ` Stefan Monnier
2013-02-01 19:53 ` Alan Mackenzie
2013-02-01 20:09 ` Achim Gratz
2013-02-01 20:15 ` Alan Mackenzie
2013-02-01 23:17 ` Stefan Monnier
2013-02-01 23:16 ` Stefan Monnier
2013-02-03 22:14 ` Alan Mackenzie
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