;;; autorevert.el --- revert buffers when files on disk change
-;; Copyright (C) 1997-1999, 2001-2012 Free Software Foundation, Inc.
+;; Copyright (C) 1997-1999, 2001-2014 Free Software Foundation, Inc.
;; Author: Anders Lindgren <andersl@andersl.com>
;; Keywords: convenience
;; Auto-Revert Mode applies to all file buffers. (If the user option
;; `global-auto-revert-non-file-buffers' is non-nil, it also applies
;; to some non-file buffers. This option is disabled by default.)
-;; Since checking a remote file is too slow, these modes do not check
-;; or revert remote files.
+;;
+;; Since checking a remote file is slow, these modes check or revert
+;; remote files only if the user option `auto-revert-remote-files' is
+;; non-nil. It is recommended to disable version control for remote
+;; files.
;;
;; Both modes operate by checking the time stamp of all files at
;; intervals of `auto-revert-interval'. The default is every five
;; Emacs. You should never even notice that this package is active
;; (except that your buffers will be reverted, of course).
;;
+;; If Emacs is compiled with file notification support, notifications
+;; are used instead of checking the time stamp of the files. You can
+;; disable this by setting the user option `auto-revert-use-notify' to
+;; nil. Alternatively, a regular expression of directories to be
+;; excluded from file notifications can be specified by
+;; `auto-revert-notify-exclude-dir-regexp'.
+;;
;; After reverting a file buffer, Auto Revert Mode normally puts point
;; at the same position that a regular manual revert would. However,
;; there is one exception to this rule. If point is at the end of the
;; change by growing at the end. It only appends the new output,
;; instead of reverting the entire buffer. It does so even if the
;; buffer contains unsaved changes. (Because they will not be lost.)
-;; Auto Revert Tail Mode works also for remote files.
;; Usage:
;;
;; Dependencies:
+(eval-when-compile (require 'cl-lib))
(require 'timer)
+(require 'filenotify)
;; Custom Group:
;;
This variable becomes buffer local when set in any fashion.")
(make-variable-buffer-local 'global-auto-revert-ignore-buffer)
+(defcustom auto-revert-remote-files nil
+ "If non-nil remote files are also reverted."
+ :group 'auto-revert
+ :type 'boolean
+ :version "24.4")
+
+(defcustom auto-revert-use-notify t
+ "If non-nil Auto Revert Mode uses file notification functions.
+You should set this variable through Custom."
+ :group 'auto-revert
+ :type 'boolean
+ :set (lambda (variable value)
+ (set-default variable value)
+ (unless (symbol-value variable)
+ (dolist (buf (buffer-list))
+ (with-current-buffer buf
+ (when (symbol-value 'auto-revert-notify-watch-descriptor)
+ (auto-revert-notify-rm-watch))))))
+ :initialize 'custom-initialize-default
+ :version "24.4")
+
+(defcustom auto-revert-notify-exclude-dir-regexp
+ (concat
+ ;; No mounted file systems.
+ "^" (regexp-opt '("/afs/" "/media/" "/mnt" "/net/" "/tmp_mnt/"))
+ ;; No remote files.
+ (unless auto-revert-remote-files "\\|^/[^/|:][^/|]+:"))
+ "Regular expression of directories to be excluded from file notifications."
+ :group 'auto-revert
+ :type 'regexp
+ :version "24.4")
+
;; Internal variables:
(defvar auto-revert-buffer-list ()
(set (make-local-variable 'auto-revert-tail-pos)
(nth 7 (file-attributes buffer-file-name)))))
+(defvar auto-revert-notify-watch-descriptor-hash-list
+ (make-hash-table :test 'equal)
+ "A hash table collecting all file watch descriptors.
+Hash key is a watch descriptor, hash value is a list of buffers
+which are related to files being watched and carrying the same
+default directory.")
+
+(defvar auto-revert-notify-watch-descriptor nil
+ "The file watch descriptor active for the current buffer.")
+(make-variable-buffer-local 'auto-revert-notify-watch-descriptor)
+(put 'auto-revert-notify-watch-descriptor 'permanent-local t)
+
+(defvar auto-revert-notify-modified-p nil
+ "Non-nil when file has been modified on the file system.
+This has been reported by a file notification event.")
+(make-variable-buffer-local 'auto-revert-notify-modified-p)
+
;; Functions:
;;;###autoload
(if auto-revert-mode
(if (not (memq (current-buffer) auto-revert-buffer-list))
(push (current-buffer) auto-revert-buffer-list))
+ (when auto-revert-use-notify (auto-revert-notify-rm-watch))
(setq auto-revert-buffer-list
(delq (current-buffer) auto-revert-buffer-list)))
(auto-revert-set-timer)
(when auto-revert-mode
- (auto-revert-buffers)
- (setq auto-revert-tail-mode nil)))
+ (let (auto-revert-use-notify)
+ (auto-revert-buffers)
+ (setq auto-revert-tail-mode nil))))
;;;###autoload
(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))
+ (let (auto-revert-use-notify)
+ (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
specifies in the mode line."
:global t :group 'auto-revert :lighter global-auto-revert-mode-text
(auto-revert-set-timer)
- (when global-auto-revert-mode
- (auto-revert-buffers)))
-
+ (if global-auto-revert-mode
+ (let (auto-revert-use-notify)
+ (auto-revert-buffers))
+ (dolist (buf (buffer-list))
+ (with-current-buffer buf
+ (when auto-revert-use-notify
+ (auto-revert-notify-rm-watch))))))
(defun auto-revert-set-timer ()
"Restart or cancel the timer used by Auto-Revert Mode.
auto-revert-interval
'auto-revert-buffers))))
+(defun auto-revert-notify-rm-watch ()
+ "Disable file notification for current buffer's associated file."
+ (when auto-revert-notify-watch-descriptor
+ (maphash
+ (lambda (key value)
+ (when (equal key auto-revert-notify-watch-descriptor)
+ (setq value (delete (current-buffer) value))
+ (if value
+ (puthash key value auto-revert-notify-watch-descriptor-hash-list)
+ (remhash key auto-revert-notify-watch-descriptor-hash-list)
+ (ignore-errors
+ (file-notify-rm-watch auto-revert-notify-watch-descriptor)))))
+ auto-revert-notify-watch-descriptor-hash-list)
+ (remove-hook 'kill-buffer-hook 'auto-revert-notify-rm-watch))
+ (setq auto-revert-notify-watch-descriptor nil
+ auto-revert-notify-modified-p nil))
+
+(defun auto-revert-notify-add-watch ()
+ "Enable file notification for current buffer's associated file."
+ ;; We can assume that `buffer-file-name' and
+ ;; `auto-revert-use-notify' are non-nil.
+ (when (or (string-match auto-revert-notify-exclude-dir-regexp
+ (expand-file-name default-directory))
+ (file-symlink-p buffer-file-name))
+ ;; Fallback to file checks.
+ (set (make-local-variable 'auto-revert-use-notify) nil))
+
+ (when (not auto-revert-notify-watch-descriptor)
+ (setq auto-revert-notify-watch-descriptor
+ (ignore-errors
+ (file-notify-add-watch
+ (expand-file-name buffer-file-name default-directory)
+ '(change attribute-change) 'auto-revert-notify-handler)))
+ (if auto-revert-notify-watch-descriptor
+ (progn
+ (puthash
+ auto-revert-notify-watch-descriptor
+ (cons (current-buffer)
+ (gethash auto-revert-notify-watch-descriptor
+ auto-revert-notify-watch-descriptor-hash-list))
+ auto-revert-notify-watch-descriptor-hash-list)
+ (add-hook (make-local-variable 'kill-buffer-hook)
+ 'auto-revert-notify-rm-watch))
+ ;; Fallback to file checks.
+ (set (make-local-variable 'auto-revert-use-notify) nil))))
+
+(defun auto-revert-notify-handler (event)
+ "Handle an EVENT returned from file notification."
+ (with-demoted-errors
+ (let* ((descriptor (car event))
+ (action (nth 1 event))
+ (file (nth 2 event))
+ (file1 (nth 3 event)) ;; Target of `renamed'.
+ (buffers (gethash descriptor
+ auto-revert-notify-watch-descriptor-hash-list)))
+ ;; Check, that event is meant for us.
+ (cl-assert descriptor)
+ ;; We do not handle `deleted', because nothing has to be refreshed.
+ (unless (eq action 'deleted)
+ (cl-assert (memq action '(attribute-changed changed created renamed))
+ t)
+ ;; Since we watch a directory, a file name must be returned.
+ (cl-assert (stringp file))
+ (when (eq action 'renamed) (cl-assert (stringp file1)))
+ ;; Loop over all buffers, in order to find the intended one.
+ (cl-dolist (buffer buffers)
+ (when (buffer-live-p buffer)
+ (with-current-buffer buffer
+ (when (and (stringp buffer-file-name)
+ (or
+ (and (memq action '(attribute-changed changed
+ created))
+ (string-equal
+ (file-name-nondirectory file)
+ (file-name-nondirectory buffer-file-name)))
+ (and (eq action 'renamed)
+ (string-equal
+ (file-name-nondirectory file1)
+ (file-name-nondirectory buffer-file-name)))))
+ ;; Mark buffer modified.
+ (setq auto-revert-notify-modified-p t)
+ ;; No need to check other buffers.
+ (cl-return)))))))))
+
(defun auto-revert-active-p ()
"Check if auto-revert is active (in current buffer or globally)."
(or auto-revert-mode
This is an internal function used by Auto-Revert Mode."
(when (or auto-revert-tail-mode (not (buffer-modified-p)))
(let* ((buffer (current-buffer)) size
+ ;; Tramp caches the file attributes. Setting
+ ;; `remote-file-name-inhibit-cache' forces Tramp to reread
+ ;; the values.
+ (remote-file-name-inhibit-cache t)
(revert
(or (and buffer-file-name
+ (or auto-revert-remote-files
+ (not (file-remote-p buffer-file-name)))
+ (or (not auto-revert-use-notify)
+ auto-revert-notify-modified-p)
(if auto-revert-tail-mode
- ;; Tramp caches the file attributes. Setting
- ;; `remote-file-name-inhibit-cache' forces Tramp
- ;; to reread the values.
- (let ((remote-file-name-inhibit-cache t))
- (and (file-readable-p buffer-file-name)
- (/= auto-revert-tail-pos
- (setq size
- (nth 7 (file-attributes
- buffer-file-name))))))
- (and (not (file-remote-p buffer-file-name))
- (file-readable-p buffer-file-name)
- (not (verify-visited-file-modtime buffer)))))
+ (and (file-readable-p buffer-file-name)
+ (/= auto-revert-tail-pos
+ (setq size
+ (nth 7 (file-attributes
+ buffer-file-name)))))
+ (funcall (or buffer-stale-function
+ #'buffer-stale--default-function)
+ t)))
(and (or auto-revert-mode
global-auto-revert-non-file-buffers)
- revert-buffer-function
- (boundp 'buffer-stale-function)
- (functionp buffer-stale-function)
- (funcall buffer-stale-function t))))
+ (funcall (or buffer-stale-function
+ #'buffer-stale--default-function)
+ t))))
eob eoblist)
+ (setq auto-revert-notify-modified-p nil)
(when revert
(when (and auto-revert-verbose
(not (eq revert 'fast)))
are checked.
Non-file buffers that have a custom `revert-buffer-function' and
-a `buffer-stale-function' are reverted either when Auto-Revert
+`buffer-stale-function' are reverted either when Auto-Revert
Mode is active in that buffer, or when the variable
`global-auto-revert-non-file-buffers' is non-nil and Global
Auto-Revert Mode is active.
(memq buf auto-revert-buffer-list))
(setq auto-revert-buffer-list
(delq buf auto-revert-buffer-list)))
- (when (auto-revert-active-p) (auto-revert-handler)))
+ (when (auto-revert-active-p)
+ ;; Enable file notification.
+ (when (and auto-revert-use-notify buffer-file-name
+ (not auto-revert-notify-watch-descriptor))
+ (auto-revert-notify-add-watch))
+ (auto-revert-handler)))
;; Remove dead buffer from `auto-revert-buffer-list'.
(setq auto-revert-buffer-list
(delq buf auto-revert-buffer-list))))
HCoop / bpt / emacs.git / blobdiff