;;; autorevert.el --- revert buffers when files on disk change
;; Copyright (C) 1997, 1998, 1999, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007 Free Software Foundation, Inc.
+;; 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
;; Author: Anders Lindgren <andersl@andersl.com>
;; Keywords: convenience
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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 3, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, 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
;; 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, Inc., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
"Position of last known end of file.")
(add-hook 'find-file-hook
- (lambda ()
- (set (make-local-variable 'auto-revert-tail-pos)
- (nth 7 (file-attributes buffer-file-name)))))
+ (lambda ()
+ (set (make-local-variable 'auto-revert-tail-pos)
+ (nth 7 (file-attributes buffer-file-name)))))
;; Functions:
;;;###autoload
(define-minor-mode auto-revert-tail-mode
"Toggle reverting tail of buffer when file on disk grows.
-With arg, turn Tail mode on iff arg is positive.
+With arg, turn Tail mode on if arg is positive, otherwise turn it off.
When Tail mode is enabled, the tail of the file is constantly
followed, as with the shell command `tail -f'. This means that
(auto-revert-tail-mode 0)
(error "This buffer is not visiting a file"))
(if (and (buffer-modified-p)
- (not auto-revert-tail-pos) ; library was loaded only after finding file
+ (zerop auto-revert-tail-pos) ; library was loaded only after finding file
(not (y-or-n-p "Buffer is modified, so tail offset may be wrong. Proceed? ")))
(auto-revert-tail-mode 0)
+ ;; a-r-tail-pos stores the size of the file at the time of the
+ ;; last revert. After this package loads, it adds a
+ ;; find-file-hook to set this variable every time a file is
+ ;; loaded. If the package is loaded only _after_ visiting the
+ ;; file to be reverted, then we have no idea what the value of
+ ;; a-r-tail-pos should have been when the file was visited. If
+ ;; the file has changed on disk in the meantime, all we can do
+ ;; is offer to revert the whole thing. If you choose not to
+ ;; revert, then you might miss some output then happened
+ ;; between visiting the file and activating a-r-t-mode.
+ (and (zerop auto-revert-tail-pos)
+ (not (verify-visited-file-modtime (current-buffer)))
+ (y-or-n-p "File changed on disk, content may be missing. \
+Perform a full revert? ")
+ ;; Use this (not just revert-buffer) for point-preservation.
+ (auto-revert-handler))
;; else we might reappend our own end when we save
(add-hook 'before-save-hook (lambda () (auto-revert-tail-mode 0)) nil t)
(or (local-variable-p 'auto-revert-tail-pos) ; don't lose prior position
"Revert current buffer, if appropriate.
This is an internal function used by Auto-Revert Mode."
(when (or auto-revert-tail-mode (not (buffer-modified-p)))
- (let* ((buffer (current-buffer))
+ (let* ((buffer (current-buffer)) size
(revert
(or (and buffer-file-name
(not (file-remote-p buffer-file-name))
(file-readable-p buffer-file-name)
- (not (verify-visited-file-modtime buffer)))
+ (if auto-revert-tail-mode
+ (/= auto-revert-tail-pos
+ (setq size
+ (nth 7 (file-attributes buffer-file-name))))
+ (not (verify-visited-file-modtime buffer))))
(and (or auto-revert-mode
global-auto-revert-non-file-buffers)
revert-buffer-function
(push window eoblist)))
'no-mini t))
(if auto-revert-tail-mode
- (auto-revert-tail-handler)
+ (auto-revert-tail-handler size)
;; Bind buffer-read-only in case user has done C-x C-q,
;; so as not to forget that. This gives undesirable results
;; when the file's mode changes, but that is less common.
(when (or revert auto-revert-check-vc-info)
(vc-find-file-hook)))))
-(defun auto-revert-tail-handler ()
- (let ((size (nth 7 (file-attributes buffer-file-name)))
- (modified (buffer-modified-p))
+(defun auto-revert-tail-handler (size)
+ (let ((modified (buffer-modified-p))
(inhibit-read-only t) ; Ignore.
(file buffer-file-name)
(buffer-file-name nil)) ; Ignore that file has changed.
- (when (> size auto-revert-tail-pos)
+ (when (/= auto-revert-tail-pos size)
(run-hooks 'before-revert-hook)
(undo-boundary)
(save-restriction
(widen)
(save-excursion
(goto-char (point-max))
- (insert-file-contents file nil auto-revert-tail-pos size)))
+ (insert-file-contents file nil
+ (and (< auto-revert-tail-pos size)
+ auto-revert-tail-pos)
+ size)))
(run-hooks 'after-revert-hook)
(undo-boundary)
(setq auto-revert-tail-pos size)
(not (and auto-revert-stop-on-user-input
(input-pending-p))))
(let ((buf (car bufs)))
- (if (buffer-name buf) ; Buffer still alive?
+ (if (buffer-live-p buf)
(with-current-buffer buf
;; Test if someone has turned off Auto-Revert Mode in a
;; non-standard way, for example by changing major mode.
HCoop / bpt / emacs.git / blobdiff