;;; Prevent killing the *scratch* buffer -- source forgotten
;;;----------------------------------------------------------------------
;;; Make the *scratch* buffer behave like "The thing your aunt gave you,
;;; which you don't know what is."
(save-excursion
(set-buffer (get-buffer-create "*scratch*"))
(make-local-variable 'kill-buffer-query-functions)
(add-hook 'kill-buffer-query-functions 'kill-scratch-buffer))
(defun kill-scratch-buffer ()
;; The next line is just in case someone calls this manually
(set-buffer (get-buffer-create "*scratch*"))
;; Kill the current (*scratch*) buffer
(remove-hook 'kill-buffer-query-functions 'kill-scratch-buffer)
(kill-buffer (current-buffer))
;; Make a brand new *scratch* buffer
(set-buffer (get-buffer-create "*scratch*"))
(lisp-interaction-mode)
(make-local-variable 'kill-buffer-query-functions)
(add-hook 'kill-buffer-query-functions 'kill-scratch-buffer)
;; Since we killed it, don't let caller do that.
nil)
;;;----------------------------------------------------------------------
(defun --scratch-buffer(&optional reset)
"Get the *scratch* buffer object.
Make new scratch buffer unless it exists.
If RESET is non-nil arrange it that it can't be killed."
(let ((R (get-buffer "*scratch*")))
(unless R
(message "Creating new *scratch* buffer")
(setq R (get-buffer-create "*scratch*") reset t))
(when reset
(save-excursion
(set-buffer R)
(lisp-interaction-mode)
(make-local-variable 'kill-buffer-query-functions)
(add-hook 'kill-buffer-query-functions '(lambda()(bury-buffer) nil)
)))
R))
在使用 。 emacs时应用这个函数:
(--scratch-buffer t)
(run-with-idle-timer 3 t '--scratch-buffer)
(defvar --scratch-directory
(save-excursion (set-buffer "*scratch*") default-directory)
"The `default-directory' local variable of the *scratch* buffer.")
(defconst --no-desktop (member "--no-desktop" command-line-args)
"True when no desktop file is loaded (--no-desktop command-line switch set).")
(defun --startup-directory ()
"Return directory from which Emacs was started: `desktop-dirname' or the `--scratch-directory'.
Note also `default-minibuffer-frame'."
(if (and (not --no-desktop) desktop-dirname)
desktop-dirname
--scratch-directory))
(defun scratch ()
"create a new scratch buffer to work in. (could be *scratch* - *scratchX*)"
(interactive)
(let ((n 0)
bufname)
(while (progn
(setq bufname (concat "*scratch"
(if (= n 0) "" (int-to-string n))
"*"))
(setq n (1+ n))
(get-buffer bufname)))
(switch-to-buffer (get-buffer-create bufname))
(if (= n 1) initial-major-mode))) ; 1, because n was incremented