mcgrath%paris.Berkeley.EDU@GINGER.BERKELEY.EDU (Roland McGrath) (11/27/89)
The following file implements kill-buffer-hooks, which get run when you kill a
buffer with kill-buffer. I implemented this in the primitive for version 19,
but it just now occurred to me to do it in Lisp for version 18.
I use this kill-buffer hook always:
(defun save-if-necessary ()
"Save the buffer if necessary and the user wants to."
(let ((name (buffer-file-name)))
(and name (buffer-modified-p)
(if (y-or-n-p (format "Save file %s? " name))
(save-buffer)
(set-buffer-modified-p nil)
(message "") ; Get rid of the question.
))))
I also use a buffer-local kill-buffer hook installed by my gnus-Startup-hook to
run gnus-Group-exit when I kill the *Newsgroups* buffer, and one installed by
my mh-folder-mode-hook to kill the show-+FOLDER buffer when I kill the +FOLDER
buffer (since I don't like old buffers cluttering up my life).
This approach is more general than the modified enhanced kill-buffer recently
posted, and it has the advantage that it will be standard in version 19.
;;; Run hook functions when killing buffers.
;;;
;;; Copyright (C) 1989 Roland McGrath
;;;
;;; This program is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 1, or (at your option)
;;; any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; A copy of the GNU General Public License can be obtained from this
;;; program's author (send electronic mail to roland@ai.mit.edu) or from
;;; the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA
;;; 02139, USA.
;;;
;;; Send bug reports to roland@ai.mit.edu.
;; To use this, just load it and set kill-buffer-hooks as desired.
;; You cannot autoload this file.
(defvar kill-buffer-hooks nil "\
*Hooks to run when a buffer is killed.
May be a function or a list of functions. If it is a list,
each element is called in order. Functions are called with
no arguments, with the buffer to be killed current.")
;; Rename the kill-buffer subr to basic-kill-buffer.
(let ((func (symbol-function 'kill-buffer)))
(and (subrp func)
(fset 'basic-kill-buffer func)))
(defun kill-buffer (buffer)
(interactive "bKill buffer: ")
(set-buffer buffer)
(run-hooks 'kill-buffer-hooks)
(basic-kill-buffer buffer))
(provide 'kill-buffer-hooks)