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+;;; wdired.el --- Rename files editing their names in dired buffers
+
+;; Copyright (C) 2001, 2004  Free Software Foundation, Inc.
+
+;; Filename: wdired.el
+;; Author: Juan León Lahoz García <[email protected]>
+;; Version: 1.91
+;; Keywords: dired, environment, files, renaming
+
+;; 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.
+
+;; 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 GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; wdired.el (the "w" is for writable) provides an alternative way of
+;; renaming files.
+;;
+;; Have you ever wished to use C-x r t (string-rectangle), M-%
+;; (query-replace), M-c (capitalize-word), etc to change the name of
+;; the files in a "dired" buffer? Now you can do this. All the power
+;; of emacs commands are available to renaming files!
+;; 
+;; This package provides a function that makes the filenames of a a
+;; dired buffer editable, by changing the buffer mode (which inhibits
+;; all of the commands of dired mode). Here you can edit the names of
+;; one or more files and directories, and when you press C-c C-c, the
+;; renaming takes effect and you are back to dired mode.
+;;
+;; Another things you can do with wdired:
+;;
+;; - To move files to another directory (by typing their path,
+;;   absolute or relative, as a part of the new filename).
+;;
+;; - To change the target of symbolic links.
+;;
+;; - To change the permission bits of the filenames (in systems with a
+;;   working unix-alike `dired-chmod-program'). See and customize the
+;;   variable `wdired-allow-to-change-permissions'. To change a single
+;;   char (toggling between its two more usual values) you can press
+;;   the space bar over it or left-click the mouse. To set any char to
+;;   an specific value (this includes the SUID, SGID and STI bits) you
+;;   can use the key labeled as the letter you want. Please note that
+;;   permissions of the links cannot be changed in that way, because
+;;   the change would affect to their targets, and this would not be
+;;   WYSIWYG :-).
+;;
+;; - To mark files for deletion, by deleting their whole filename.
+;;
+;; I do not have a URL to hang wdired, but you can use the one below
+;; to find the latest version:
+;;
+;; http://groups.google.com/groups?as_ugroup=gnu.emacs.sources&as_q=wdired
+
+;;; Installation:
+
+;; Add this file (byte-compiling it is recommended) to your load-path.
+;; Then add one of these set of lines (or similar ones) to your config:
+;;
+;; This is the easy way:
+;;
+;; (require 'wdired)
+;; (define-key dired-mode-map "r" 'wdired-change-to-wdired-mode)
+;;
+;; This is recommended way for faster emacs startup time and lower
+;; memory consumption, but remind to add these lines before dired.el
+;; gets loaded (i.e., near the beginning of your .emacs file):
+;;
+;; (autoload 'wdired-change-to-wdired-mode "wdired")
+;; (add-hook 'dired-load-hook
+;;           '(lambda ()
+;;              (define-key dired-mode-map "r" 'wdired-change-to-wdired-mode)
+;;              (define-key dired-mode-map
+;;                [menu-bar immediate wdired-change-to-wdired-mode]
+;;                '("Edit File Names" . wdired-change-to-wdired-mode))))
+;;
+;;
+;; Type "M-x customize-group RET wdired" if you want make changes to
+;; the default behavior.
+
+;;; Usage:
+
+;; Then, you can start editing the names of the files by typing "r"
+;; (or whatever key you choose, or M-x wdired-change-to-wdired-mode).
+;; Use C-c C-c when finished or C-c C-k to abort. You can use also the
+;; menu options: in dired mode, "Edit File Names" under "Immediate".
+;; While editing the names, a new submenu "WDired" is available at top
+;; level. You can customize the behavior of this package from this
+;; menu.
+
+;;; Change Log:
+
+;; From 1.9 to 1.91
+;;
+;; - Fixed a bug (introduced in 1.9) so now files can be marked for
+;;   deletion again, by deleting their whole filename.
+
+;; From 1.8 to 1.9
+;;
+;; - Another alternative way of editing permissions allowed, see
+;;   `wdired-allow-to-change-permissions' for details.
+;;
+;; - Now wdired doesn`t relies in regexp so much. As a consequence of
+;;   this, you can add newlines to filenames and symlinks targets
+;;   (although this is not very usual, IMHO). Please note that dired
+;;   (at least in Emacs 21.1 and previous) does not work very well
+;;   with filenames with newlines in them, so RET is deactivated in
+;;   wdired mode. But you can activate it if you want.
+;;
+;; - Now `upcase-word' `capitalize-word' and `downcase-word' are not
+;;   advised to work better with wdired mode, but the keys binded to
+;;   them use wdired versions of that commands.
+;;
+;; - Now "undo" actions are not inherited from wdired mode when
+;;   changing to dired mode.
+;;
+;; - Code and documentation cleanups.
+;;
+;; - Fixed a bug that was making wdired to fail on users with
+;;   `dired-backup-overwrite' set to t.
+;;
+;; - C-c C-[ now abort changes.
+
+;; From 1.7 to 1.8
+;;
+;; - Now permission (access-control) bits of the files can be changed.
+;;   Please see the commentary section and the custom variable
+;;   `wdired-allow-to-change-permissions' for details.
+;;
+;; - Added another possible value for the variable
+;;   `wdired-always-move-to-filename-beginning', useful to change
+;;   permission bits of several files without the cursor jumping to
+;;   filenames when changing lines.
+
+;; From 0.1 to 1.7
+
+;; - I've moved the list of changes to another file, because it was
+;;   huge. Ask me for it or search older versions in google.
+
+;;; TODO:
+
+;; - Make it to work in XEmacs. Any volunteer?
+
+;;; Code:
+
+(eval-when-compile
+  (require 'advice)
+  (defvar make-symbolic-link) ;Avoid a compilation warning in NTEmacs
+  (defvar dired-backup-overwrite) ; Only in emacs 20.x this is a custom var
+  (set (make-local-variable 'byte-compile-dynamic) t))
+
+(eval-and-compile
+  (require 'dired)
+  (autoload 'dired-do-create-files-regexp "dired-aux")
+  (autoload 'dired-call-process "dired-aux"))
+
+(defgroup wdired nil
+  "Mode to rename files by editing their names in dired buffers."
+  :group 'dired)
+
+(defcustom wdired-use-interactive-rename nil
+  "*If t, confirmation is required before actually rename the files.
+Confirmation is required also for overwriting files.  If nil, no
+confirmation is required for change the file names, and the variable
+`wdired-is-ok-overwrite' is used to see if it is ok to overwrite files
+without asking."
+  :type 'boolean
+  :group 'wdired)
+
+(defcustom wdired-is-ok-overwrite nil
+  "*If non-nil the renames can overwrite files without asking. 
+This variable is used only if `wdired-use-interactive-rename' is nil."
+  :type 'boolean
+  :group 'wdired)
+
+(defcustom wdired-always-move-to-filename-beginning nil
+  "*If t the \"up\" and \"down\" movement is done as in dired mode.
+That is, always move the point to the beginning of the filename at line.
+
+If `sometimes, only move to the beginning of filename if the point is
+before it, and `track-eol' is honored.  This behavior is very handy
+when editing several filenames.
+
+If nil, \"up\" and \"down\" movement is done as in any other buffer."
+  :type '(choice (const :tag "As in any other mode" nil)
+		 (const :tag "Smart cursor placement" sometimes)
+		 (other :tag "As in dired mode" t))
+  :group 'wdired)
+
+(defcustom wdired-advise-functions t
+  "*If t some editing commands are advised when wdired is loaded.
+The advice only has effect in wdired mode.  These commands are
+`query-replace' `query-replace-regexp' `replace-string', and the
+advice makes them to ignore read-only regions, so no attempts to
+modify these regions are done by them, and so they don't end
+prematurely.
+
+Setting this to nil does not unadvise the functions, if they are
+already advised, but new Emacs will not advise them."
+  :type 'boolean
+  :group 'wdired)
+
+(defcustom wdired-allow-to-redirect-links t
+  "*If non-nil, the target of the symbolic links can be changed also.
+In systems without symbolic links support, this variable has no effect
+at all."
+  :type 'boolean
+  :group 'wdired)
+
+(defcustom wdired-allow-to-change-permissions nil
+  "*If non-nil, the permissions bits of the files can be changed also.
+
+If t, to change a single bit, put the cursor over it and press the
+space bar, or left click over it.  You can also hit the letter you want
+to set: if this value is allowed, the character in the buffer will be
+changed.  Anyway, the point is advanced one position, so, for example,
+you can keep the \"x\" key pressed to give execution permissions to
+everybody to that file.
+
+If `advanced, the bits are freely editable.  You can use
+`string-rectangle', `query-replace', etc.  You can put any value (even
+newlines), but if you want your changes to be useful, you better put a
+intelligible value.
+
+Anyway, the real change of the permissions is done with the external
+program `dired-chmod-program', which must exist."
+  :type '(choice (const :tag "Not allowed" nil)
+		 (const :tag "Toggle/set bits" t)
+		 (other :tag "Bits freely editable" advanced))
+  :group 'wdired)
+
+(define-key dired-mode-map [menu-bar immediate wdired-change-to-wdired-mode]
+  '("Edit File Names" . wdired-change-to-wdired-mode))
+
+(defvar wdired-mode-map nil)
+(unless wdired-mode-map
+  (setq wdired-mode-map (make-sparse-keymap))
+  (define-key wdired-mode-map "\C-x\C-s" 'wdired-finish-edit)
+  (define-key wdired-mode-map "\C-c\C-c" 'wdired-finish-edit)
+  (define-key wdired-mode-map "\C-c\C-k" 'wdired-abort-changes)
+  (define-key wdired-mode-map "\C-c\C-[" 'wdired-abort-changes)
+  (define-key wdired-mode-map [return]   'wdired-newline)
+  (define-key wdired-mode-map "\C-j"     'wdired-newline)
+  (define-key wdired-mode-map "\C-o"     'wdired-newline)
+  (define-key wdired-mode-map [up]       'wdired-previous-line)
+  (define-key wdired-mode-map "\C-p"     'wdired-previous-line)
+  (define-key wdired-mode-map [down]     'wdired-next-line)
+  (define-key wdired-mode-map "\C-n"     'wdired-next-line)
+  (define-key wdired-mode-map [menu-bar wdired]
+    (cons "WDired" (make-sparse-keymap "WDired")))
+  (define-key wdired-mode-map [menu-bar wdired wdired-customize]
+    '("Options" . wdired-customize))
+  (define-key wdired-mode-map [menu-bar wdired dashes]
+      '("--"))
+  (define-key wdired-mode-map [menu-bar wdired wdired-abort-changes]
+    '("Abort Changes" . wdired-abort-changes))
+  (define-key wdired-mode-map [menu-bar wdired wdired-finish-edit]
+    '("Validate Changes" . wdired-finish-edit))
+  (substitute-key-definition 'upcase-word 'wdired-upcase-word
+			     wdired-mode-map global-map)
+  (substitute-key-definition 'capitalize-word 'wdired-capitalize-word
+			     wdired-mode-map global-map)
+  (substitute-key-definition 'downcase-word 'wdired-downcase-word
+			     wdired-mode-map global-map))
+
+(defvar wdired-mode-hooks nil
+  "Hooks run when changing to wdired mode.")
+
+(defvar wdired-load-hooks nil
+  "Hooks run after loading wdired code.")
+
+;; Local variables (put here to avoid compilation gripes)
+(defvar wdired-col-perm) ;; Column where the permission bits start
+(defvar wdired-old-content)
+
+
+(defun wdired-mode ()
+  "\\<wdired-mode-map>File Names Editing mode.
+
+Press \\[wdired-finish-edit] to make the changes to take effect and
+exit.  To abort the edit, use \\[wdired-abort-changes].
+
+In this mode you can edit the names of the files, the target of the
+links and the permission bits of the files.  You can `customize-group'
+wdired.
+
+Editing things out of the filenames, or adding or deleting lines is
+not allowed, because the rest of the buffer is read-only."
+  (interactive)
+  (error "This mode can be enabled only by `wdired-change-to-wdired-mode'"))
+(put 'wdired-mode 'mode-class 'special)
+
+
+;;;###autoload
+(defun wdired-change-to-wdired-mode ()
+  "Put a dired buffer in a mode in which filenames are editable.
+In this mode the names of the files can be changed, and after 
+typing C-c C-c the files and directories in disk are renamed.
+
+See `wdired-mode'."
+  (interactive)
+  (set (make-local-variable 'wdired-old-content)
+       (buffer-substring (point-min) (point-max)))
+  (use-local-map wdired-mode-map)
+  (menu-bar-mode (or menu-bar-mode -1)) ;Force redisplay menu
+  (setq buffer-read-only nil)
+  (dired-unadvertise default-directory)
+  (make-local-hook 'kill-buffer-hook)
+  (add-hook 'kill-buffer-hook 'wdired-check-kill-buffer nil t)
+  (setq major-mode 'wdired-mode)
+  (setq mode-name "Edit filenames")
+  (setq revert-buffer-function 'wdired-revert)
+  ;; I temp disable undo for performance: since I'm going to clear the
+  ;; undo list, it can save more than a 9% of time with big
+  ;; directories because setting properties modify the undo-list.
+  (buffer-disable-undo)
+  (wdired-preprocess-files)
+  (if wdired-allow-to-change-permissions
+      (wdired-preprocess-perms))
+  (if (and wdired-allow-to-redirect-links (fboundp 'make-symbolic-link))
+      (wdired-preprocess-symlinks))
+  (buffer-enable-undo) ; Performance hack. See above.
+  (set-buffer-modified-p nil)
+  (setq buffer-undo-list nil)
+  (run-hooks wdired-mode-hooks)
+  (message "Press C-c C-c when finished"))
+
+
+;; Protect the buffer so only the filenames can be changed, and put
+;; properties so filenames (old and new) can be easily found.
+(defun wdired-preprocess-files ()
+  (put-text-property 1 2 'front-sticky t)
+  (save-excursion
+    (goto-char (point-min))
+    (let ((b-protection (point))
+	  filename)
+      (while (not (eobp))
+	(setq filename (dired-get-filename nil t))
+        (if (and filename (not (string-match "/\\.\\.?$" filename)))
+            (progn
+	      (dired-move-to-filename)
+	      (put-text-property (- (point) 2) (1- (point)) 'old-name filename)
+              (put-text-property b-protection (1- (point)) 'read-only t)
+              (setq b-protection (dired-move-to-end-of-filename t))))
+              (put-text-property (point) (1+ (point)) 'end-name t)
+        (forward-line))
+      (put-text-property b-protection (point-max) 'read-only t))))
+
+;; This code is a copy of some dired-get-filename lines.
+(defsubst wdired-normalize-filename (file)
+  (setq file
+	(read (concat
+	       "\"" (or (dired-string-replace-match
+			 "\\([^\\]\\|\\`\\)\"" file
+			 "\\1\\\\\"" nil t)
+			file)
+	       "\"")))
+  (and file buffer-file-coding-system
+       (not file-name-coding-system)
+       (not default-file-name-coding-system)
+       (setq file (encode-coding-string file buffer-file-coding-system)))
+  file)
+
+(defun wdired-get-filename (&optional no-dir old)
+  "Return the filename at line.
+Similar to `dired-get-filename' but it doesn't relies in regexps.  It
+relies in wdired buffer's properties.  Optional arg NO-DIR with value
+non-nil means don't include directory.  Optional arg OLD with value
+non-nil means return old filename."
+  (let (beg end file)
+    (save-excursion
+      (setq end (progn (end-of-line) (point)))
+      (beginning-of-line)
+      (setq beg (next-single-property-change (point) 'old-name nil end))
+      (if (not (eq beg end))
+	  (progn
+	    (if old
+		(setq file (get-text-property beg 'old-name))
+	      (setq end (next-single-property-change (1+ beg) 'end-name))
+	      (setq file (buffer-substring-no-properties (+ 2 beg) end)))
+	    (and file (setq file (wdired-normalize-filename file)))))
+      (if (or no-dir old)
+	  file
+	(and file (> (length file) 0)
+             (concat (dired-current-directory) file))))))
+
+
+(defun wdired-change-to-dired-mode ()
+  "Change the mode back to dired."
+  (let ((inhibit-read-only t))
+    (remove-text-properties (point-min) (point-max)
+			    '(read-only nil local-map nil)))
+  (put-text-property 1 2 'front-sticky nil)
+  (use-local-map dired-mode-map)
+  (menu-bar-mode (or menu-bar-mode -1)) ;Force redisplay menu
+  (setq buffer-read-only t)
+  (setq major-mode 'dired-mode)
+  (setq mode-name "Dired")
+  (dired-advertise)
+  (remove-hook 'kill-buffer-hook 'wdired-check-kill-buffer t)
+  (setq revert-buffer-function 'dired-revert))
+
+
+(defun wdired-abort-changes ()
+  "Abort changes and return to dired mode."
+  (interactive)
+  (let ((inhibit-read-only t))
+    (erase-buffer)
+    (insert wdired-old-content))
+  (wdired-change-to-dired-mode)
+  (set-buffer-modified-p nil)
+  (setq buffer-undo-list nil))
+
+(defun wdired-finish-edit ()
+  "Actually rename files based on your editing in the Dired buffer."
+  (interactive)
+  (wdired-change-to-dired-mode)
+  (let ((overwrite (or wdired-is-ok-overwrite 1))
+	(changes nil)
+	(files-deleted nil)
+	(errors 0)
+	file-ori file-new tmp-value)
+    (save-excursion
+      (if (and wdired-allow-to-redirect-links
+	       (fboundp 'make-symbolic-link))
+	  (progn
+	    (setq tmp-value (wdired-do-symlink-changes))
+	    (setq errors (cdr tmp-value))
+	    (setq changes (car tmp-value))))
+      (if (and wdired-allow-to-change-permissions
+	       (boundp 'wdired-col-perm)) ; could have been changed
+	  (progn
+	    (setq tmp-value (wdired-do-perm-changes))
+	    (setq errors (+ errors (cdr tmp-value)))
+	    (setq changes (or changes (car tmp-value)))))
+      (goto-char (point-max))
+      (while (not (bobp))
+	(setq file-ori (wdired-get-filename nil t))
+	(if file-ori
+	    (setq file-new (wdired-get-filename)))
+	(if (and file-ori (not (equal file-new file-ori)))
+	    (progn
+	      (setq changes t)
+	      (if (not file-new) ;empty filename!
+		  (setq files-deleted (cons file-ori files-deleted))
+		(progn
+		  (setq file-new (substitute-in-file-name file-new))
+		  (if wdired-use-interactive-rename
+		      (wdired-search-and-rename file-ori file-new)
+		    (condition-case err
+			(let ((dired-backup-overwrite nil))
+			  (dired-rename-file file-ori file-new
+					     overwrite))
+		      (error
+		       (setq errors (1+ errors))
+		       (dired-log (concat "Rename `" file-ori "' to `"
+					  file-new "' failed:\n%s\n")
+				  err))))))))
+	(forward-line -1)))
+    (if changes
+        (revert-buffer) ;The "revert" is necessary to re-sort the buffer
+      (let ((buffer-read-only nil))
+	(remove-text-properties (point-min) (point-max)
+				'(old-name nil end-name nil old-link nil
+					   end-link nil end-perm nil
+					   old-perm nil perm-changed nil))
+	(message "(No changes to be performed)")))
+    (if files-deleted
+        (wdired-flag-for-deletion files-deleted))
+    (if (> errors 0)
+        (dired-log-summary (format "%d rename actions failed" errors) nil)))
+  (set-buffer-modified-p nil)
+  (setq buffer-undo-list nil))
+
+;; Renames a file, searching it in a modified dired buffer, in order
+;; to be able to use `dired-do-create-files-regexp' and get its
+;; "benefits"
+(defun wdired-search-and-rename (filename-ori filename-new)
+  (save-excursion
+    (goto-char (point-max))
+    (forward-line -1)
+    (let ((exit-while nil)
+	  curr-filename)
+      (while (not exit-while)
+        (setq curr-filename (wdired-get-filename))
+        (if (and curr-filename
+                 (equal (substitute-in-file-name curr-filename) filename-new))
+            (progn
+              (setq exit-while t)
+              (let ((inhibit-read-only t))
+                (dired-move-to-filename)
+                (search-forward (wdired-get-filename t) nil t)
+                (replace-match (file-name-nondirectory filename-ori) t t))
+              (dired-do-create-files-regexp
+               (function dired-rename-file)
+               "Move" 1 ".*" filename-new nil t))
+          (progn
+            (forward-line -1)
+            (beginning-of-line)
+            (setq exit-while (= 1 (point)))))))))
+
+;; marks a list of files for deletion
+(defun wdired-flag-for-deletion (filenames-ori)
+  (save-excursion
+    (goto-char (point-min))
+    (while (not (eobp))
+      (if (member (dired-get-filename nil t) filenames-ori)
+          (dired-flag-file-deletion 1)
+	(forward-line)))))
+
+(defun wdired-customize ()
+  "Customize wdired options."
+  (interactive)
+  (customize-apropos "wdired" 'groups))
+
+(defun wdired-revert (&optional arg noconfirm)
+  "Discard changes in the buffer and update the changes in the disk."
+  (wdired-change-to-dired-mode)
+  (revert-buffer)
+  (wdired-change-to-wdired-mode))
+
+(defun wdired-check-kill-buffer ()
+  (if (and
+       (buffer-modified-p)
+       (not (y-or-n-p "Buffer changed. Discard changes and kill buffer? ")))
+      (error nil)))
+
+(defun wdired-next-line (arg)
+  "Move down lines then position at filename or the current column.
+See `wdired-always-move-to-filename-beginning'.  Optional prefix ARG
+says how many lines to move; default is one line."
+  (interactive "p")
+  (next-line arg)
+  (if (or (eq wdired-always-move-to-filename-beginning t)
+	  (and wdired-always-move-to-filename-beginning
+	       (< (current-column)
+		  (save-excursion (dired-move-to-filename)
+				  (current-column)))))
+      (dired-move-to-filename)))
+
+(defun wdired-previous-line (arg)
+  "Move up lines then position at filename or the current column.
+See `wdired-always-move-to-filename-beginning'.  Optional prefix ARG
+says how many lines to move; default is one line."
+  (interactive "p")
+  (previous-line arg)
+  (if (or (eq wdired-always-move-to-filename-beginning t)
+	  (and wdired-always-move-to-filename-beginning
+	       (< (current-column)
+		  (save-excursion (dired-move-to-filename)
+				  (current-column)))))
+      (dired-move-to-filename)))
+
+;; dired doesn't works well with newlines, so ...
+(defun wdired-newline ()
+  "Do nothing."
+  (interactive))
+
+;; Put the needed properties to allow the user to change links' targets
+(defun wdired-preprocess-symlinks ()
+  (let ((inhibit-read-only t))
+    (save-excursion
+      (goto-char (point-min))
+      (while (not (eobp))
+        (if (looking-at dired-re-sym)
+            (progn
+              (re-search-forward " -> \\(.*\\)$")
+	      (put-text-property (- (match-beginning 1) 2)
+				 (1- (match-beginning 1)) 'old-link
+				 (match-string-no-properties 1))
+              (put-text-property (match-end 1) (1+ (match-end 1)) 'end-link t)
+	      (put-text-property (1- (match-beginning 1))
+				 (match-end 1) 'read-only nil)))
+        (forward-line)
+	(beginning-of-line)))))
+
+
+(defun wdired-get-previous-link (&optional old move)
+  "Return the next symlink target.
+If OLD, return the old target.  If MOVE, move point before it."
+  (let (beg end target)
+    (setq beg (previous-single-property-change (point) 'old-link nil))
+    (if beg
+	(progn
+	  (if old
+	      (setq target (get-text-property (1- beg) 'old-link))
+	    (setq end (next-single-property-change beg 'end-link))
+	    (setq target (buffer-substring-no-properties (1+ beg) end)))
+	  (if move (goto-char (1- beg)))))
+    (and target (wdired-normalize-filename target))))
+
+
+
+;; Perform the changes in the target of the changed links.
+(defun wdired-do-symlink-changes()
+  (let ((changes nil)
+	(errors 0)
+	link-to-ori link-to-new link-from)
+    (goto-char (point-max))
+    (while (setq link-to-new (wdired-get-previous-link))
+      (setq link-to-ori (wdired-get-previous-link t t))
+      (setq link-from (wdired-get-filename nil t))
+      (if (not (equal link-to-new link-to-ori))
+          (progn
+            (setq changes t)
+            (if (equal link-to-new "") ;empty filename!
+                (setq link-to-new "/dev/null"))
+	    (condition-case err
+		(progn 
+		  (delete-file link-from)
+		  (make-symbolic-link
+		   (substitute-in-file-name link-to-new) link-from))
+		  (error
+		   (setq errors (1+ errors))
+		   (dired-log (concat "Link `" link-from "' to `"
+				      link-to-new "' failed:\n%s\n")
+			      err))))))
+    (cons changes errors)))
+
+;; Perform a "case command" skipping read-only words.
+(defun wdired-xcase-word (command arg)
+  (if (< arg 0)
+      (funcall command arg)
+    (progn
+      (while (> arg 0)
+	(condition-case err
+	    (progn
+	      (funcall command 1)
+	      (setq arg (1- arg)))
+	  (error
+	   (if (not (forward-word 1))
+	       (setq arg 0))))))))
+
+(defun wdired-downcase-word (arg)
+  "Wdired version of `downcase-word'.
+Like original function but it skips read-only words."
+  (interactive "p")
+  (wdired-xcase-word 'downcase-word arg))
+
+(defun wdired-upcase-word (arg)
+  "Wdired version of `upcase-word'.
+Like original function but it skips read-only words."
+  (interactive "p")
+  (wdired-xcase-word 'upcase-word arg))
+
+(defun wdired-capitalize-word (arg)
+  "Wdired version of `capitalize-word'.
+Like original function but it skips read-only words."
+  (interactive "p")
+  (wdired-xcase-word 'capitalize-word arg))
+
+;; The following code is related to advice some interactive functions
+;; to make some editing commands in wdired mode not to fail trying to
+;; change read-only text. Notice that some advises advice and unadvise
+;; them-self to another functions: search-forward and
+;; re-search-forward. This is to keep these functions advised only
+;; when is necessary. Since they are built-in commands used heavily in
+;; lots of places, to have it permanently advised would cause some
+;; performance loss.
+
+
+(defun wdired-add-skip-in-replace (command)
+  "Advice COMMAND to skip matches while they have read-only properties.
+This is useful to avoid \"read-only\" errors in search and replace
+commands.  This advice only has effect in wdired mode."
+  (eval
+    `(defadvice ,command (around wdired-discard-read-only activate)
+       ,(format "Make %s to work better with wdired,\n%s."  command
+		"skipping read-only matches when invoked without argument")
+       ad-do-it
+       (if (eq major-mode 'wdired-mode)
+	   (while (and ad-return-value
+		       (text-property-any
+			(max 1 (1- (match-beginning 0))) (match-end 0)
+			'read-only t))
+	     ad-do-it))
+       ad-return-value)))
+
+
+(defun wdired-add-replace-advice (command)
+  "Advice COMMAND to skip matches while they have read-only properties.
+This is useful to avoid \"read-only\" errors in search and replace
+commands.  This advice only has effect in wdired mode."
+  (eval
+   `(defadvice ,command (around wdired-grok-read-only activate)
+       ,(format "Make %s to work better with wdired,\n%s."  command
+		"skipping read-only matches when invoked without argument")
+       (if (eq major-mode 'wdired-mode)
+           (progn
+             (wdired-add-skip-in-replace 'search-forward)
+             (wdired-add-skip-in-replace 're-search-forward)
+             (unwind-protect 
+                 ad-do-it
+               (progn
+                 (ad-remove-advice 'search-forward
+                                   'around 'wdired-discard-read-only)
+                 (ad-remove-advice 're-search-forward
+                                   'around 'wdired-discard-read-only)
+                 (ad-update 'search-forward)
+                 (ad-update 're-search-forward))))
+         ad-do-it)
+       ad-return-value)))
+
+
+(if wdired-advise-functions
+    (progn
+      (mapcar 'wdired-add-replace-advice
+              '(query-replace query-replace-regexp replace-string))))
+
+
+;; The following code deals with changing the access bits (or
+;; permissions) of the files.
+
+(defvar wdired-perm-mode-map nil)
+(unless wdired-perm-mode-map
+  (setq wdired-perm-mode-map (copy-keymap wdired-mode-map))
+  (define-key wdired-perm-mode-map " " 'wdired-toggle-bit)
+  (define-key wdired-perm-mode-map "r" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map "w" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map "x" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map "-" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map "S" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map "s" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map "T" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map "t" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map "s" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map "l" 'wdired-set-bit)
+  (define-key wdired-perm-mode-map [down-mouse-1] 'wdired-mouse-toggle-bit))
+
+;; Put a local-map to the permission bits of the files, and store the
+;; original name and permissions as a property
+(defun wdired-preprocess-perms()
+  (let ((inhibit-read-only t)
+	filename)
+    (set (make-local-variable 'wdired-col-perm) nil)
+    (save-excursion
+      (goto-char (point-min))
+      (while (not (eobp))
+	(if (and (not (looking-at dired-re-sym))
+		 (setq filename (wdired-get-filename)))
+	    (progn
+	      (re-search-forward dired-re-perms)
+	      (or wdired-col-perm
+		  (setq wdired-col-perm (- (current-column) 9)))
+	      (if (eq wdired-allow-to-change-permissions 'advanced)
+		  (put-text-property (match-beginning 0) (match-end 0)
+				     'read-only nil)
+		(put-text-property (1+ (match-beginning 0)) (match-end 0)
+				   'local-map wdired-perm-mode-map))
+	      (put-text-property (match-end 0) (1+ (match-end 0)) 'end-perm t)
+	      (put-text-property (match-beginning 0) (1+ (match-beginning 0))
+				 'old-perm (match-string-no-properties 0))))
+        (forward-line)
+	(beginning-of-line)))))
+
+(defun wdired-perm-allowed-in-pos (char pos)
+  (cond
+   ((= char ?-)          t)
+   ((= char ?r)          (= (% pos 3) 0))
+   ((= char ?w)          (= (% pos 3) 1))
+   ((= char ?x)          (= (% pos 3) 2))
+   ((memq char '(?s ?S)) (memq pos '(2 5)))
+   ((memq char '(?t ?T)) (= pos 8))
+   ((= char ?l)          (= pos 5))))
+
+(defun wdired-set-bit ()
+  "Set a permission bit character."
+  (interactive)
+  (if (wdired-perm-allowed-in-pos last-command-char
+                                  (- (current-column) wdired-col-perm))
+      (let ((new-bit (char-to-string last-command-char))
+            (inhibit-read-only t)
+	    (pos-prop (- (point) (- (current-column) wdired-col-perm))))
+        (put-text-property 0 1 'local-map wdired-perm-mode-map new-bit)
+        (put-text-property 0 1 'read-only t new-bit)
+        (insert new-bit)
+        (delete-char 1)
+	(put-text-property pos-prop (1- pos-prop) 'perm-changed t))
+    (forward-char 1)))
+
+(defun wdired-toggle-bit()
+  "Toggle the permission bit at point."
+  (interactive)
+  (let ((inhibit-read-only t)
+	(new-bit "-")
+	(pos-prop (- (point) (- (current-column) wdired-col-perm))))
+    (if (eq (char-after (point)) ?-)
+	(setq new-bit	
+	      (if (= (% (- (current-column) wdired-col-perm) 3) 0) "r"
+		(if (= (% (- (current-column) wdired-col-perm) 3) 1) "w"
+		  "x"))))
+    (put-text-property 0 1 'local-map wdired-perm-mode-map new-bit)
+    (put-text-property 0 1 'read-only t new-bit)
+    (insert new-bit)
+    (delete-char 1)
+    (put-text-property pos-prop (1- pos-prop) 'perm-changed t)))
+
+(defun wdired-mouse-toggle-bit (event)
+  "Toggle the permission bit that was left clicked."
+  (interactive "e")
+  (mouse-set-point event)
+  (wdired-toggle-bit))
+
+;; Allowed chars for 4000 bit are Ss  in position 3
+;; Allowed chars for 2000 bit are Ssl in position 6
+;; Allowed chars for 1000 bit are Tt  in position 9
+(defun wdired-perms-to-number (perms)
+  (let ((nperm 0777))
+    (if (= (elt perms 1) ?-) (setq nperm (- nperm 400)))
+    (if (= (elt perms 2) ?-) (setq nperm (- nperm 200)))
+    (let ((p-bit (elt perms 3)))
+      (if (memq p-bit '(?- ?S)) (setq nperm (- nperm 100)))
+      (if (memq p-bit '(?s ?S)) (setq nperm (+ nperm 4000))))
+    (if (= (elt perms 4) ?-) (setq nperm (- nperm 40)))
+    (if (= (elt perms 5) ?-) (setq nperm (- nperm 20)))
+    (let ((p-bit (elt perms 6)))
+      (if (memq p-bit '(?- ?S ?l)) (setq nperm (- nperm 10)))
+      (if (memq p-bit '(?s ?S ?l)) (setq nperm (+ nperm 2000))))
+    (if (= (elt perms 7) ?-) (setq nperm (- nperm 4)))
+    (if (= (elt perms 8) ?-) (setq nperm (- nperm 2)))
+    (let ((p-bit (elt perms 9)))
+      (if (memq p-bit '(?- ?T)) (setq nperm (- nperm 1)))
+      (if (memq p-bit '(?t ?T)) (setq nperm (+ nperm 1000))))
+    nperm))
+
+;; Perform the changes in the permissions of the files that have
+;; changed.
+(defun wdired-do-perm-changes ()
+  (let ((changes nil)
+	(errors 0)
+	(prop-wanted (if (eq wdired-allow-to-change-permissions 'advanced)
+			 'old-perm 'perm-changed))
+	filename perms-ori perms-new perm-tmp)
+    (goto-char (next-single-property-change (point-min) prop-wanted
+					    nil (point-max)))
+    (while (not (eobp))
+      (setq perms-ori (get-text-property (point) 'old-perm))
+      (setq perms-new (buffer-substring-no-properties
+		       (point) (next-single-property-change (point) 'end-perm)))
+      (if (not (equal perms-ori perms-new))
+	  (progn
+	    (setq changes t)
+	    (setq filename (wdired-get-filename nil t))
+	    (if (= (length perms-new) 10)
+		(progn
+		  (setq perm-tmp
+			(int-to-string (wdired-perms-to-number perms-new)))
+		  (if (not (equal 0 (dired-call-process dired-chmod-program
+				     t perm-tmp filename)))
+		      (progn
+			(setq errors (1+ errors))
+			(dired-log (concat dired-chmod-program " " perm-tmp
+					   " `" filename "' failed\n\n")))))
+	    (setq errors (1+ errors))
+	    (dired-log (concat "Cannot parse permission `" perms-new
+			       "' for file `" filename "'\n\n")))))
+      (goto-char (next-single-property-change (1+ (point)) prop-wanted
+					      nil (point-max))))
+    (cons changes errors)))
+
+(provide 'wdired)
+(run-hooks wdired-load-hooks)
+
+;;; wdired.el ends here
+
+