--- /dev/null
+;;; saveplace.el --- automatically save place in files.
+
+;; Copyright (C) 1993 Free Software Foundation, Inc.
+
+;; Author: Karl Fogel <kfogel@cs.oberlin.edu>
+;; Maintainer: FSF
+;; Created: July, 1993
+;; Version: 1.0
+;; Keywords: bookmarks, placeholders
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;; Automatically save place in files, so that visiting them later
+;; (even during a different Emacs session) automatically moves point
+;; to the saved position, when the file is first found. Uses the
+;; value of buffer-local variable save-place to determine whether to
+;; save position or not.
+;;
+;; Don't autoload this, rather, load it, since it modifies
+;; find-file-hooks and other hooks.
+
+;; this is what I was using during testing:
+;; (define-key ctl-x-map "p" 'toggle-save-place)
+
+(defvar save-place-alist nil
+ "Alist of saved places to go back to when revisiting files.
+Each element looks like (FILENAME . POSITION);
+visiting file FILENAME goes automatically to position POSITION
+rather than the beginning of the buffer.
+This alist is saved between Emacs sessions.")
+
+(defvar save-place nil
+ "*Non-nil means automatically save place in each file.
+This means when you visit a file, point goes to the last place
+where it was when you previously visited the same file.
+This variable is automatically buffer-local.
+
+If you wish your place in any file to always be automatically saved,
+simply put this in your `~/.emacs' file:
+
+\(setq-default save-place t\)")
+
+(make-variable-buffer-local 'save-place)
+
+(defvar save-place-file "~/.emacs-places"
+ "*Name of the file that records `save-place-alist' value.")
+
+(defvar save-place-loaded nil
+ "Non-nil means that the `save-place-file' has been loaded.")
+
+(defun toggle-save-place (&optional parg)
+ "Toggle whether to save your place in this file between sessions.
+If this mode is enabled, point is recorded when you kill the buffer
+or exit Emacs. Visiting this file again will go to that position,
+even in a later Emacs session.
+
+If called with a prefix arg, the mode is enabled if and only if
+the argument is positive.
+
+To save places automatically in all files, put this in your `.emacs' file:
+
+\(setq-default save-place t\)"
+ (interactive "P")
+ (if (not buffer-file-name)
+ (message
+ (format "Buffer \"%s\" not visiting a file." (buffer-name)))
+ (if (and save-place (or (not parg) (<= parg 0)))
+ (progn
+ (message "No place will be saved in this file.")
+ (setq save-place nil))
+ (message "Place will be saved.")
+ (setq save-place t))))
+
+(defun save-place-to-alist ()
+ ;; put filename and point in a cons box and then cons that onto the
+ ;; front of the save-place-alist, if save-place is non-nil.
+ ;; Otherwise, just delete that file from the alist.
+ ;; first check to make sure alist has been loaded in from the master
+ ;; file. If not, do so, then feel free to modify the alist. It
+ ;; will be saved again when Emacs is killed.
+ (or save-place-loaded (load-save-place-alist-from-file))
+ (if buffer-file-name
+ (progn
+ (let ((cell (assoc buffer-file-name save-place-alist)))
+ (if cell
+ (setq save-place-alist (delq cell save-place-alist))))
+ (if save-place
+ (setq save-place-alist
+ (cons (cons buffer-file-name (point))
+ save-place-alist))))))
+
+(defun save-place-alist-to-file ()
+ (let ((file (expand-file-name save-place-file)))
+ (save-excursion
+ (message (format "Saving places to %s..." file))
+ (set-buffer (get-buffer-create " *Saved Places*"))
+ (delete-region (point-min) (point-max))
+ (if (file-readable-p file)
+ (insert-file-contents file))
+ (delete-region (point-min) (point-max))
+ (goto-char (point-min))
+ (print save-place-alist (current-buffer))
+ (write-file file)
+ (kill-buffer (current-buffer))
+ (message (format "Saving places to %s... done." file)))))
+
+(defun load-save-place-alist-from-file ()
+ (if (not save-place-loaded)
+ (progn
+ (setq save-place-loaded t)
+ (let ((file (expand-file-name save-place-file)))
+ ;; make sure that the alist does not get overwritten, and then
+ ;; load it if it exists:
+ (if (file-readable-p file)
+ (save-excursion
+ (message (format "Loading places from %s..."
+ save-place-file))
+ ;; don't want to use find-file because we have been
+ ;; adding hooks to it.
+ (set-buffer (get-buffer-create " *Saved Places*"))
+ (delete-region (point-min) (point-max))
+ (insert-file-contents file)
+ (goto-char (point-min))
+ (setq save-place-alist
+ (car (read-from-string
+ (buffer-substring (point-min) (point-max)))))
+ (kill-buffer (current-buffer))
+ (message (format "Loading places from %s... done." file))
+ t)
+ t)
+ nil))))
+
+(defun save-places-to-alist ()
+ ;; go through buffer-list, saving places to alist if save-place is
+ ;; non-nil, deleting them from alist if it is nil.
+ (let ((buf-list (buffer-list)))
+ (while buf-list
+ ;; put this into a save-excursion in case someone is counting on
+ ;; another function in kill-emacs-hook to act on the last buffer
+ ;; they were in:
+ (save-excursion
+ (set-buffer (car buf-list))
+ ;; save-place checks buffer-file-name too, but we can avoid
+ ;; overhead of function call by checking here too.
+ (and buffer-file-name (save-place-to-alist))
+ (setq buf-list (cdr buf-list))))))
+
+(add-hook
+ 'find-file-hooks
+ (function
+ (lambda ()
+ (or save-place-loaded (load-save-place-alist-from-file))
+ (let ((cell (assoc buffer-file-name save-place-alist)))
+ (if cell
+ (progn
+ (goto-char (cdr cell))
+ ;; and make sure it will be saved again for later.
+ (setq save-place t)))))))
+
+(add-hook 'kill-emacs-hook
+ (function
+ (lambda ()
+ (progn
+ (save-places-to-alist)
+ (save-place-alist-to-file)))))
+
+(add-hook 'kill-buffer-hook 'save-place-to-alist)
+
+(provide 'saveplace) ; why not...
+
+;;; saveplace.el ends here
+
HCoop / bpt / emacs.git / commitdiff