RE: *scratch* lost

["Rancier, Jeffrey" <Jeffrey.Rancier@xerox.com>]

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Would the following help?

(require 'protbuf)
(protect-buffer-from-kill-mode nil (get-buffer "*scratch*")) 

|-----Original Message-----
|From: help-gnu-emacs-bounces+jeffrey.rancier=xerox.com@gnu.org 
|[mailto:help-gnu-emacs-bounces+jeffrey.rancier=xerox.com@gnu.or
|g] On Behalf Of B. T. Raven
|Sent: Wednesday, June 17, 2009 8:25 AM
|To: help-gnu-emacs@gnu.org
|Subject: Re: *scratch* lost
|
|Stefan Kamphausen wrote:
|> Hi Pascal,
|> 
|> pjb@informatimago.com (Pascal J. Bourguignon) writes:
|> 
|>>> Hm, I don't seem to need that.  I can always M-x switch-to-buffer
|>>> *scratch* RET (having to type "*scratch*" without completion since 
|>>> it may have been killed) and end up in a perfect 
|stracth-buffer with 
|>>> lisp-interaction-mode.  It even works with iswitchb-buffer which 
|>>> asks before creating the new buffer.
|>> Of course, but if you want to insert the initial-scratch-message...
|> 
|> OK, I loose that.  I understand that it is meant for 
|newcomers anyway. 
|> 
|>> And switch-to-buffer creates a buffer in default-major-mode, not 
|>> emacs-lisp-mode.
|> 
|> My default-major-mode is fundamental-mode and my scratch buffer is 
|> always in lisp-interaction-mode.  I tried to find out where 
|that comes 
|> from but without success.  Nothing in auto-mode-alist, 
|> magic-mode-alist, interpreter-mode-alist.  No configuration 
|found with 
|> grep -ir lisp-interaction-mode ~/.emacs.d/.  Nothing found using 
|> apropos-value lisp-interaction-mode.  Funny that it, but very handy 
|> ;-)
|> 
|> 
|> Best,
|> Stefan
|
|Thanks for insight, Stefan. My problem was that I had a 
|*scratch* buffer sans message, in Fundamental mode immediately 
|after restarting Emacs. 
|Impossible, no? But it was caused by some anomaly in specifing (via
|custom) 'org-agenda-files and in some way that debug-init 
|didn't catch. 
|After fixing that, the normal *scratch* was generated spontaneously. 
|Also I learned that most of .emacs's (not all) can be gotten 
|by evaluating .emacs piecewise after running emac -Q. When I 
|was thinking elisp had gone crazy I discovered that I had 
|invoked another keyboard (Italian instead of U.S Dvorak) that 
|I had neglected to unload after testing something. The whole 
|experience was so bizarre that I don't even want to understand 
|what happened.
|
|
|Ed
|

[-- Attachment #2: protbuf.el --]
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;;; protbuf.el --- protect buffers from accidental killing

;; Copyright (C) 1994, 1999 Noah S. Friedman

;; Author: Noah Friedman <friedman@splode.com>
;; Maintainer: friedman@splode.com
;; Keywords: extensions
;; Status: Works with emacs 19.23 or later.
;; Created: 1994-06-21

;; $Id: protbuf.el,v 1.7 2000/08/21 10:45:38 friedman Exp $

;; 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 2, 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.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, you can either send email to this
;; program's maintainer or write to: The Free Software Foundation,
;; Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.

;;; Commentary:

;; This package allows you to make it harder to kill buffers accidentally,
;; e.g. by being too trigger happy selecting items in the buffer menu.
;; protect-process-buffer-from-kill-mode is perhaps the more useful of the
;; two, making it harder to accidentally kill shell buffers without
;; terminating the process in them first.

;;; Code:

(defvar protect-buffer-verbose t
  "*If non-nil, print a message when attempting to kill a protected buffer.")

(defvar protect-buffer-bury-p t
  "*If non-nil, bury buffer when attempting to kill it.
This only has an effect if the buffer to be killed is the one
visible in the selected window.")

\f
;;;###autoload
(defvar protect-buffer-from-kill-mode nil
  "*If non-`nil', then prevent buffer from being accidentally killed.
This variable is local to all buffers.")
(progn
  (make-variable-buffer-local 'protect-buffer-from-kill-mode)
  (put 'protect-buffer-from-kill-mode 'permanent-local t)
  (or (assq 'protect-buffer-from-kill-mode minor-mode-alist)
      (setq minor-mode-alist (cons '(protect-buffer-from-kill-mode " ProtBuf")
                                   minor-mode-alist))))

;;;###autoload
(defvar protect-process-buffer-from-kill-mode nil
  "*If non-`nil', then protect buffer with live process from being killed.
This variable is local to all buffers.")
(progn
  (make-variable-buffer-local 'protect-process-buffer-from-kill-mode)
  (put 'protect-process-buffer-from-kill-mode 'permanent-local t)
  (or (assq 'protect-process-buffer-from-kill-mode minor-mode-alist)
      (setq minor-mode-alist
            (cons '(protect-process-buffer-from-kill-mode " ProtProcBuf")
                  minor-mode-alist))))

;;;###autoload
(defvar protect-process-buffer-from-kill-preserve-function nil
  "*Function to run to determine whether to kill a process buffer.
If function returns non-nil, buffer is preserved.  Otherwise, the buffer
may be killed.

If this variable is undefined, default action is to test whether a process
object is using this buffer as a process buffer.

This variable is buffer-local when set.")
(make-variable-buffer-local 'protect-process-buffer-from-kill-preserve-function)
(put 'protect-process-buffer-from-kill-preserve-function 'permanent-local t)


\f
;;;###autoload
(defun protect-buffer-from-kill-mode (&optional prefix buffer)
  "Protect buffer from being killed.
To remove this protection, call this command with a negative prefix argument."
  (interactive "P")
  (or buffer (setq buffer (current-buffer)))
  (save-excursion
    ;; Each cond does its own set-buffer *after* comparing prefix just in
    ;; case there's a buffer-local variable `prefix' to screw up the works.
    (cond
     ((null prefix)
      (set-buffer buffer)
      (setq protect-buffer-from-kill-mode
            (not protect-buffer-from-kill-mode)))
     ((>= prefix 0)
      (set-buffer buffer)
      (setq protect-buffer-from-kill-mode t))
     (t
      (set-buffer buffer)
      (setq protect-buffer-from-kill-mode nil)))
    ;; This is always done because kill-buffer-query-functions might have
    ;; been buffer-local when this package was initially loaded, leaving
    ;; the global value unchanged.
    (add-hook 'kill-buffer-query-functions 'protect-buffer-from-kill)))

;; This function is listed in kill-buffer-query-functions; it should return
;; nil if the buffer should not be killed, t otherwise.
(defun protect-buffer-from-kill ()
  (cond
   (protect-buffer-from-kill-mode
    (and protect-buffer-verbose
         (message "Buffer \"%s\" is protected from being killed."
                  (buffer-name)))
    (and protect-buffer-bury-p
         (eq (current-buffer)
             (window-buffer (selected-window)))
         (bury-buffer))
    nil)
   (t)))

\f
;;;###autoload
(defun protect-process-buffer-from-kill-mode (&optional prefix buffer)
  "Protect buffer from being killed as long as it has an active process.
To remove this protection, call this command with a negative prefix argument."
  (interactive "P")
  (or buffer (setq buffer (current-buffer)))
  (save-excursion
    ;; Each cond does its own set-buffer *after* comparing prefix just in
    ;; case there's a buffer-local variable `prefix' to screw up the works.
    (cond
     ((null prefix)
      (set-buffer buffer)
      (setq protect-process-buffer-from-kill-mode
            (not protect-process-buffer-from-kill-mode)))
     ((>= prefix 0)
      (set-buffer buffer)
      (setq protect-process-buffer-from-kill-mode t))
     (t
      (set-buffer buffer)
      (setq protect-process-buffer-from-kill-mode nil)))
    ;; This is always done because kill-buffer-query-functions might have
    ;; been buffer-local when this package was initially loaded, leaving
    ;; the global value unchanged.
    (add-hook 'kill-buffer-query-functions 'protect-process-buffer-from-kill)))

;; This function is listed in kill-buffer-query-functions; it should return
;; nil if the buffer should be protected, t if buffer should be killed.
(defun protect-process-buffer-from-kill ()
  (cond
   ((not protect-process-buffer-from-kill-mode) t)
   ((or (and (boundp 'protect-process-buffer-from-kill-preserve-function)
             protect-process-buffer-from-kill-preserve-function
             (funcall protect-process-buffer-from-kill-preserve-function))
        (get-buffer-process (current-buffer)))
    (and protect-buffer-verbose
         (message "Buffer \"%s\" has live process; not killing."
                  (buffer-name)))
    (and protect-buffer-bury-p
         (eq (current-buffer)
             (window-buffer (selected-window)))
         (bury-buffer))
    nil)
   (t t)))

(add-hook 'kill-buffer-query-functions 'protect-buffer-from-kill)
(add-hook 'kill-buffer-query-functions 'protect-process-buffer-from-kill)

(provide 'protbuf)

;;; protbuf.el ends here