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;;; vc-dispatcher.el -- generic command-dispatcher facility.

;; Copyright (C) 2008
;;   Free Software Foundation, Inc.

;; Author:     FSF (see below for full credits)
;; Maintainer: Eric S. Raymond <esr@thyrsus.com>
;; Keywords: tools

;; 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 3, 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, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Credits:

;; Designed and implemented by Eric S. Raymond, originally as part of VC mode.

;;; Commentary:

;; Goals:
;;
;; There is a class of front-ending problems that Emacs might be used
;; to address that involves selecting sets of files, or possibly
;; directories, and passing the selection set to slave commands.  The
;; prototypical example, from which this code is derived, is talking
;; to version-control systems. 
;;
;; vc-dispatcher.el is written to decouple the UI issues in such front
;; ends from their application-specific logic. It also provides a
;; service layer for running the slave commands either synchronously
;; or asynchronously and managing the message/error logs from the
;; command runs.
;;
;; Similar UI problems can be expected to come up in applications
;; areas other than VCSes; IDEs and document search are two obvious ones.
;; This mode is intended to ensure that the Emacs interfaces for all such
;; beasts are consistent and carefully designed.  But even if nothing
;; but VC ever uses it, getting the layer separation right will be
;; a valuable thing.

;; Dispatcher's universe:
;;
;; The universe consists of the file tree rooted at the current
;; directory. The dispatcher's upper layer deduces some subset 
;; of the file tree from the state of the currently visited buffer 
;; and returns that subset, presumably to a client mode.
;;
;; The user may be attempting to select one of three contexts: an
;; explicitly selected fileset, the current working directory, or a
;; global (null) context.  The user may be looking at either of two
;; different views; a buffer visiting a file, or a directory buffer
;; generated by vc-dispatcher.  The main UI problem connected with
;; this mode is that the user may need to be able to select any of
;; these three contexts from either view.
;;
;; The lower layer of this mode runs commands in subprocesses, either
;; synchronously or asynchronously.  Commands may be launched in one
;; of two ways: they may be run immediately, or the calling mode can
;; create a closure associated with a text-entry buffer, to be
;; executed when the user types C-c to ship the buffer contents. In
;; either case the command messages and error (if any) will remain
;; available in a status buffer.

(provide 'vc-dispatcher)

(eval-when-compile
  (require 'cl)
  (require 'dired)      ; for dired-map-over-marks macro
  (require 'dired-aux))	; for dired-kill-{line,tree}

(defcustom vc-delete-logbuf-window t
  "If non-nil, delete the *VC-log* buffer and window after each logical action.
If nil, bury that buffer instead.
This is most useful if you have multiple windows on a frame and would like to
preserve the setting."
  :type 'boolean
  :group 'vc)

(defcustom vc-command-messages nil
  "If non-nil, display run messages from back-end commands."
  :type 'boolean
  :group 'vc)

(defcustom vc-dired-listing-switches "-al"
  "Switches passed to `ls' for vc-dired.  MUST contain the `l' option."
  :type 'string
  :group 'vc
  :version "21.1")

(defcustom vc-dired-recurse t
  "If non-nil, show directory trees recursively in VC Dired."
  :type 'boolean
  :group 'vc
  :version "20.3")

(defcustom vc-dired-terse-display t
  "If non-nil, show only locked or locally modified files in VC Dired."
  :type 'boolean
  :group 'vc
  :version "20.3")

(defcustom vc-dir-mode-hook nil
  "Normal hook run by `vc-dir-mode'.
See `run-hooks'."
  :type 'hook
  :group 'vc)

(defvar vc-log-fileset)
(defvar vc-dired-mode nil)
(make-variable-buffer-local 'vc-dired-mode)

;; Common command execution logic

(defun vc-process-filter (p s)
  "An alternative output filter for async process P.
One difference with the default filter is that this inserts S after markers.
Another is that undo information is not kept."
  (let ((buffer (process-buffer p)))
    (when (buffer-live-p buffer)
      (with-current-buffer buffer
        (save-excursion
          (let ((buffer-undo-list t)
                (inhibit-read-only t))
            (goto-char (process-mark p))
            (insert s)
            (set-marker (process-mark p) (point))))))))

(defun vc-setup-buffer (&optional buf)
  "Prepare BUF for executing a VC command and make it current.
BUF defaults to \"*vc*\", can be a string and will be created if necessary."
  (unless buf (setq buf "*vc*"))
  (let ((camefrom (current-buffer))
	(olddir default-directory))
    (set-buffer (get-buffer-create buf))
    (kill-all-local-variables)
    (set (make-local-variable 'vc-parent-buffer) camefrom)
    (set (make-local-variable 'vc-parent-buffer-name)
	 (concat " from " (buffer-name camefrom)))
    (setq default-directory olddir)
    (let ((buffer-undo-list t)
          (inhibit-read-only t))
      (erase-buffer))))

(defvar vc-sentinel-movepoint)          ;Dynamically scoped.

(defun vc-process-sentinel (p s)
  (let ((previous (process-get p 'vc-previous-sentinel))
        (buf (process-buffer p)))
    ;; Impatient users sometime kill "slow" buffers; check liveness
    ;; to avoid "error in process sentinel: Selecting deleted buffer".
    (when (buffer-live-p buf)
      (when previous (funcall previous p s))
      (with-current-buffer buf
        (setq mode-line-process
              (let ((status (process-status p)))
                ;; Leave mode-line uncluttered, normally.
                (unless (eq 'exit status)
                  (format " (%s)" status))))
        (let (vc-sentinel-movepoint)
          ;; Normally, we want async code such as sentinels to not move point.
          (save-excursion
            (goto-char (process-mark p))
            (let ((cmds (process-get p 'vc-sentinel-commands)))
              (process-put p 'vc-sentinel-commands nil)
              (dolist (cmd cmds)
                ;; Each sentinel may move point and the next one should be run
                ;; at that new point.  We could get the same result by having
                ;; each sentinel read&set process-mark, but since `cmd' needs
                ;; to work both for async and sync processes, this would be
                ;; difficult to achieve.
                (vc-exec-after cmd))))
          ;; But sometimes the sentinels really want to move point.
          (when vc-sentinel-movepoint
	    (let ((win (get-buffer-window (current-buffer) 0)))
	      (if (not win)
		  (goto-char vc-sentinel-movepoint)
		(with-selected-window win
		  (goto-char vc-sentinel-movepoint))))))))))

(defun vc-set-mode-line-busy-indicator ()
  (setq mode-line-process
	(concat " " (propertize "[waiting...]"
                                'face 'mode-line-emphasis
                                'help-echo
                                "A VC command is in progress in this buffer"))))

(defun vc-exec-after (code)
  "Eval CODE when the current buffer's process is done.
If the current buffer has no process, just evaluate CODE.
Else, add CODE to the process' sentinel."
  (let ((proc (get-buffer-process (current-buffer))))
    (cond
     ;; If there's no background process, just execute the code.
     ;; We used to explicitly call delete-process on exited processes,
     ;; but this led to timing problems causing process output to be
     ;; lost.  Terminated processes get deleted automatically
     ;; anyway. -- cyd
     ((or (null proc) (eq (process-status proc) 'exit))
      ;; Make sure we've read the process's output before going further.
      (when proc (accept-process-output proc))
      (eval code))
     ;; If a process is running, add CODE to the sentinel
     ((eq (process-status proc) 'run)
      (vc-set-mode-line-busy-indicator)
      (let ((previous (process-sentinel proc)))
        (unless (eq previous 'vc-process-sentinel)
          (process-put proc 'vc-previous-sentinel previous))
        (set-process-sentinel proc 'vc-process-sentinel))
      (process-put proc 'vc-sentinel-commands
                   ;; We keep the code fragments in the order given
                   ;; so that vc-diff-finish's message shows up in
                   ;; the presence of non-nil vc-command-messages.
                   (append (process-get proc 'vc-sentinel-commands)
                           (list code))))
     (t (error "Unexpected process state"))))
  nil)

(defvar vc-post-command-functions nil
  "Hook run at the end of `vc-do-command'.
Each function is called inside the buffer in which the command was run
and is passed 3 arguments: the COMMAND, the FILES and the FLAGS.")

(defvar w32-quote-process-args)

(defun vc-delistify (filelist)
  "Smash a FILELIST into a file list string suitable for info messages."
  ;; FIXME what about file names with spaces?
  (if (not filelist) "."  (mapconcat 'identity filelist " ")))

;;;###autoload
(defun vc-do-command (buffer okstatus command file-or-list &rest flags)
  "Execute a VC command, notifying user and checking for errors.
Output from COMMAND goes to BUFFER, or *vc* if BUFFER is nil or the
current buffer if BUFFER is t.  If the destination buffer is not
already current, set it up properly and erase it.  The command is
considered successful if its exit status does not exceed OKSTATUS (if
OKSTATUS is nil, that means to ignore error status, if it is `async', that
means not to wait for termination of the subprocess; if it is t it means to
ignore all execution errors).  FILE-OR-LIST is the name of a working file;
it may be a list of files or be nil (to execute commands that don't expect
a file name or set of files).  If an optional list of FLAGS is present,
that is inserted into the command line before the filename."
  ;; FIXME: file-relative-name can return a bogus result because
  ;; it doesn't look at the actual file-system to see if symlinks
  ;; come into play.
  (let* ((files
	  (mapcar (lambda (f) (file-relative-name (expand-file-name f)))
		  (if (listp file-or-list) file-or-list (list file-or-list))))
	 (full-command
	  ;; What we're doing here is preparing a version of the command
	  ;; for display in a debug-progess message.  If it's fewer than
	  ;; 20 characters display the entire command (without trailing
	  ;; newline).  Otherwise display the first 20 followed by an ellipsis.
	  (concat (if (string= (substring command -1) "\n")
		      (substring command 0 -1)
		    command)
		  " "
		  (vc-delistify (mapcar (lambda (s) (if (> (length s) 20) (concat (substring s 0 2) "...")  s)) flags))
		  " " (vc-delistify files))))
    (save-current-buffer
      (unless (or (eq buffer t)
		  (and (stringp buffer)
		       (string= (buffer-name) buffer))
		  (eq buffer (current-buffer)))
	(vc-setup-buffer buffer))
      ;; If there's some previous async process still running, just kill it.
      (let ((oldproc (get-buffer-process (current-buffer))))
        ;; If we wanted to wait for oldproc to finish before doing
        ;; something, we'd have used vc-eval-after.
        ;; Use `delete-process' rather than `kill-process' because we don't
        ;; want any of its output to appear from now on.
        (if oldproc (delete-process oldproc)))
      (let ((squeezed (remq nil flags))
	    (inhibit-read-only t)
	    (status 0))
	(when files
	  (setq squeezed (nconc squeezed files)))
	(let ((exec-path (append vc-path exec-path))
	      ;; Add vc-path to PATH for the execution of this command.
	      (process-environment
	       (cons (concat "PATH=" (getenv "PATH")
			     path-separator
			     (mapconcat 'identity vc-path path-separator))
		     process-environment))
	      (w32-quote-process-args t))
	  (when (and (eq okstatus 'async) (file-remote-p default-directory))
	    ;; start-process does not support remote execution
	    (setq okstatus nil))
	  (if (eq okstatus 'async)
	      ;; Run asynchronously.
	      (let ((proc
		     (let ((process-connection-type nil))
		       (apply 'start-file-process command (current-buffer)
                              command squeezed))))
		(if vc-command-messages
		    (message "Running %s in background..." full-command))
		;;(set-process-sentinel proc (lambda (p msg) (delete-process p)))
		(set-process-filter proc 'vc-process-filter)
		(vc-exec-after
		 `(if vc-command-messages
		      (message "Running %s in background... done" ',full-command))))
	    ;; Run synchrously
	    (when vc-command-messages
	      (message "Running %s in foreground..." full-command))
	    (let ((buffer-undo-list t))
	      (setq status (apply 'process-file command nil t nil squeezed)))
	    (when (and (not (eq t okstatus))
		       (or (not (integerp status))
			   (and okstatus (< okstatus status))))
              (unless (eq ?\s (aref (buffer-name (current-buffer)) 0))
                (pop-to-buffer (current-buffer))
                (goto-char (point-min))
                (shrink-window-if-larger-than-buffer))
	      (error "Running %s...FAILED (%s)" full-command
		     (if (integerp status) (format "status %d" status) status))))
	  ;; We're done.  But don't emit a status message if running
	  ;; asychronously, it would just mislead.
	  (if (and vc-command-messages (not (eq okstatus 'async)))
	      (message "Running %s...OK = %d" full-command status)))
	(vc-exec-after
	 `(run-hook-with-args 'vc-post-command-functions
			      ',command ',file-or-list ',flags))
	status))))

;; Context management

(defun vc-position-context (posn)
  "Save a bit of the text around POSN in the current buffer.
Used to help us find the corresponding position again later
if markers are destroyed or corrupted."
  ;; A lot of this was shamelessly lifted from Sebastian Kremer's
  ;; rcs.el mode.
  (list posn
	(buffer-size)
	(buffer-substring posn
			  (min (point-max) (+ posn 100)))))

(defun vc-find-position-by-context (context)
  "Return the position of CONTEXT in the current buffer.
If CONTEXT cannot be found, return nil."
  (let ((context-string (nth 2 context)))
    (if (equal "" context-string)
	(point-max)
      (save-excursion
	(let ((diff (- (nth 1 context) (buffer-size))))
	  (when (< diff 0) (setq diff (- diff)))
	  (goto-char (nth 0 context))
	  (if (or (search-forward context-string nil t)
		  ;; Can't use search-backward since the match may continue
		  ;; after point.
		  (progn (goto-char (- (point) diff (length context-string)))
			 ;; goto-char doesn't signal an error at
			 ;; beginning of buffer like backward-char would
			 (search-forward context-string nil t)))
	      ;; to beginning of OSTRING
	      (- (point) (length context-string))))))))

(defun vc-context-matches-p (posn context)
  "Return t if POSN matches CONTEXT, nil otherwise."
  (let* ((context-string (nth 2 context))
	 (len (length context-string))
	 (end (+ posn len)))
    (if (> end (1+ (buffer-size)))
	nil
      (string= context-string (buffer-substring posn end)))))

(defun vc-buffer-context ()
  "Return a list (POINT-CONTEXT MARK-CONTEXT REPARSE).
Used by `vc-restore-buffer-context' to later restore the context."
  (let ((point-context (vc-position-context (point)))
	;; Use mark-marker to avoid confusion in transient-mark-mode.
	(mark-context  (when (eq (marker-buffer (mark-marker)) (current-buffer))
			 (vc-position-context (mark-marker))))
	;; Make the right thing happen in transient-mark-mode.
	(mark-active nil)
	;; The new compilation code does not use compilation-error-list any
	;; more, so the code below is now ineffective and might as well
	;; be disabled.  -- Stef
	;; ;; We may want to reparse the compilation buffer after revert
	;; (reparse (and (boundp 'compilation-error-list) ;compile loaded
	;; 	      ;; Construct a list; each elt is nil or a buffer
	;; 	      ;; if that buffer is a compilation output buffer
	;; 	      ;; that contains markers into the current buffer.
	;; 	      (save-current-buffer
	;; 		(mapcar (lambda (buffer)
	;; 			  (set-buffer buffer)
	;; 			  (let ((errors (or
	;; 					 compilation-old-error-list
	;; 					 compilation-error-list))
	;; 				(buffer-error-marked-p nil))
	;; 			    (while (and (consp errors)
	;; 					(not buffer-error-marked-p))
	;; 			      (and (markerp (cdr (car errors)))
	;; 				   (eq buffer
	;; 				       (marker-buffer
	;; 					(cdr (car errors))))
	;; 				   (setq buffer-error-marked-p t))
	;; 			      (setq errors (cdr errors)))
	;; 			    (if buffer-error-marked-p buffer)))
	;; 			(buffer-list)))))
	(reparse nil))
    (list point-context mark-context reparse)))

(defun vc-restore-buffer-context (context)
  "Restore point/mark, and reparse any affected compilation buffers.
CONTEXT is that which `vc-buffer-context' returns."
  (let ((point-context (nth 0 context))
	(mark-context (nth 1 context))
	;; (reparse (nth 2 context))
        )
    ;; The new compilation code does not use compilation-error-list any
    ;; more, so the code below is now ineffective and might as well
    ;; be disabled.  -- Stef
    ;; ;; Reparse affected compilation buffers.
    ;; (while reparse
    ;;   (if (car reparse)
    ;; 	  (with-current-buffer (car reparse)
    ;; 	    (let ((compilation-last-buffer (current-buffer)) ;select buffer
    ;; 		  ;; Record the position in the compilation buffer of
    ;; 		  ;; the last error next-error went to.
    ;; 		  (error-pos (marker-position
    ;; 			      (car (car-safe compilation-error-list)))))
    ;; 	      ;; Reparse the error messages as far as they were parsed before.
    ;; 	      (compile-reinitialize-errors '(4) compilation-parsing-end)
    ;; 	      ;; Move the pointer up to find the error we were at before
    ;; 	      ;; reparsing.  Now next-error should properly go to the next one.
    ;; 	      (while (and compilation-error-list
    ;; 			  (/= error-pos (car (car compilation-error-list))))
    ;; 		(setq compilation-error-list (cdr compilation-error-list))))))
    ;;   (setq reparse (cdr reparse)))

    ;; if necessary, restore point and mark
    (if (not (vc-context-matches-p (point) point-context))
	(let ((new-point (vc-find-position-by-context point-context)))
	  (when new-point (goto-char new-point))))
    (and mark-active
         mark-context
         (not (vc-context-matches-p (mark) mark-context))
         (let ((new-mark (vc-find-position-by-context mark-context)))
           (when new-mark (set-mark new-mark))))))

(defvar vc-dired-window-configuration)

;; Command closures

;; FIXME: The rev argument is VCS-specific and needs to be factored out   
(defun vc-start-entry (files rev comment initial-contents msg action &optional after-hook)
  "Accept a comment for an operation on FILES revision REV.
If COMMENT is nil, pop up a VC-log buffer, emit MSG, and set the
action on close to ACTION.  If COMMENT is a string and
INITIAL-CONTENTS is non-nil, then COMMENT is used as the initial
contents of the log entry buffer.  If COMMENT is a string and
INITIAL-CONTENTS is nil, do action immediately as if the user had
entered COMMENT.  If COMMENT is t, also do action immediately with an
empty comment.  Remember the file's buffer in `vc-parent-buffer'
\(current one if no file).  AFTER-HOOK specifies the local value
for `vc-log-after-operation-hook'."
  (let ((parent
         (if (or (eq major-mode 'vc-dired-mode) (eq major-mode 'vc-dir-mode))
             ;; If we are called from VC dired, the parent buffer is
             ;; the current buffer.
             (current-buffer)
           (if (and files (equal (length files) 1))
               (get-file-buffer (car files))
             (current-buffer)))))
    (when vc-before-checkin-hook
      (if files
	  (with-current-buffer parent
	    (run-hooks 'vc-before-checkin-hook))
	(run-hooks 'vc-before-checkin-hook)))
    (if (and comment (not initial-contents))
	(set-buffer (get-buffer-create "*VC-log*"))
      (pop-to-buffer (get-buffer-create "*VC-log*")))
    (set (make-local-variable 'vc-parent-buffer) parent)
    (set (make-local-variable 'vc-parent-buffer-name)
	 (concat " from " (buffer-name vc-parent-buffer)))
    ;;(if file (vc-mode-line file))
    (vc-log-edit files)
    (make-local-variable 'vc-log-after-operation-hook)
    (when after-hook
      (setq vc-log-after-operation-hook after-hook))
    (setq vc-log-operation action)
    (setq vc-log-revision rev)
    (when comment
      (erase-buffer)
      (when (stringp comment) (insert comment)))
    (if (or (not comment) initial-contents)
	(message "%s  Type C-c C-c when done" msg)
      (vc-finish-logentry (eq comment t)))))

;; FIXME: Reference to vc-call-backend should go.
(defun vc-finish-logentry (&optional nocomment)
  "Complete the operation implied by the current log entry.
Use the contents of the current buffer as a check-in or registration
comment.  If the optional arg NOCOMMENT is non-nil, then don't check
the buffer contents as a comment."
  (interactive)
  ;; Check and record the comment, if any.
  (unless nocomment
    ;; Comment too long?
    (vc-call-backend (or (when vc-log-fileset (vc-backend vc-log-fileset))
			 (vc-responsible-backend default-directory))
		     'logentry-check)
    (run-hooks 'vc-logentry-check-hook))
  ;; Sync parent buffer in case the user modified it while editing the comment.
  ;; But not if it is a vc-dired buffer.
  (with-current-buffer vc-parent-buffer
    (or vc-dired-mode (eq major-mode 'vc-dir-mode) (vc-buffer-sync)))
  (unless vc-log-operation
    (error "No log operation is pending"))
  ;; save the parameters held in buffer-local variables
  (let ((log-operation vc-log-operation)
	(log-fileset vc-log-fileset)
	(log-revision vc-log-revision)
	(log-entry (buffer-string))
	(after-hook vc-log-after-operation-hook)
	(tmp-vc-parent-buffer vc-parent-buffer))
    (pop-to-buffer vc-parent-buffer)
    ;; OK, do it to it
    (save-excursion
      (funcall log-operation
	       log-fileset
	       log-revision
	       log-entry))
    ;; Remove checkin window (after the checkin so that if that fails
    ;; we don't zap the *VC-log* buffer and the typing therein).
    ;; -- IMO this should be replaced with quit-window
    (let ((logbuf (get-buffer "*VC-log*")))
      (cond ((and logbuf vc-delete-logbuf-window)
	     (delete-windows-on logbuf (selected-frame))
	     ;; Kill buffer and delete any other dedicated windows/frames.
	     (kill-buffer logbuf))
	    (logbuf (pop-to-buffer "*VC-log*")
		    (bury-buffer)
		    (pop-to-buffer tmp-vc-parent-buffer))))
    ;; Now make sure we see the expanded headers
    (when log-fileset
      (mapc
       (lambda (file) (vc-resynch-buffer file vc-keep-workfiles t))
       log-fileset))
    (when vc-dired-mode
      (dired-move-to-filename))
    (when (eq major-mode 'vc-dir-mode)
      (vc-dir-move-to-goal-column))
    (run-hooks after-hook 'vc-finish-logentry-hook)))


;; The VC directory major mode.  Coopt Dired for this.
;; All VC commands get mapped into logical equivalents.

(defvar vc-dired-switches)
(defvar vc-dired-terse-mode)

(defvar vc-dired-mode-map
  (let ((map (make-sparse-keymap))
	(vmap (make-sparse-keymap)))
    (define-key map "\C-xv" vmap)
    (define-key map "v" vmap)
    (set-keymap-parent vmap vc-prefix-map)
    (define-key vmap "t" 'vc-dired-toggle-terse-mode)
    map))

(define-derived-mode vc-dired-mode dired-mode "Dired under "
  "The major mode used in VC directory buffers.

It works like Dired, but lists only files under version control, with
the current VC state of each file being indicated in the place of the
file's link count, owner, group and size.  Subdirectories are also
listed, and you may insert them into the buffer as desired, like in
Dired.

All Dired commands operate normally, with the exception of `v', which
is redefined as the version control prefix, so that you can type
`vl', `v=' etc. to invoke `vc-print-log', `vc-diff', and the like on
the file named in the current Dired buffer line.  `vv' invokes
`vc-next-action' on this file, or on all files currently marked.
There is a special command, `*l', to mark all files currently locked."
  ;; define-derived-mode does it for us in Emacs-21, but not in Emacs-20.
  ;; We do it here because dired might not be loaded yet
  ;; when vc-dired-mode-map is initialized.
  (set-keymap-parent vc-dired-mode-map dired-mode-map)
  (add-hook 'dired-after-readin-hook 'vc-dired-hook nil t)
  ;; The following is slightly modified from files.el,
  ;; because file lines look a bit different in vc-dired-mode
  ;; (the column before the date does not end in a digit).
  ;; albinus: It should be done in the original declaration.  Problem
  ;; is the optional empty state-info; otherwise ")" would be good
  ;; enough as delimeter.
  (set (make-local-variable 'directory-listing-before-filename-regexp)
  (let* ((l "\\([A-Za-z]\\|[^\0-\177]\\)")
         ;; In some locales, month abbreviations are as short as 2 letters,
         ;; and they can be followed by ".".
         (month (concat l l "+\\.?"))
         (s " ")
         (yyyy "[0-9][0-9][0-9][0-9]")
         (dd "[ 0-3][0-9]")
         (HH:MM "[ 0-2][0-9]:[0-5][0-9]")
         (seconds "[0-6][0-9]\\([.,][0-9]+\\)?")
         (zone "[-+][0-2][0-9][0-5][0-9]")
         (iso-mm-dd "[01][0-9]-[0-3][0-9]")
         (iso-time (concat HH:MM "\\(:" seconds "\\( ?" zone "\\)?\\)?"))
         (iso (concat "\\(\\(" yyyy "-\\)?" iso-mm-dd "[ T]" iso-time
                      "\\|" yyyy "-" iso-mm-dd "\\)"))
         (western (concat "\\(" month s "+" dd "\\|" dd "\\.?" s month "\\)"
                          s "+"
                          "\\(" HH:MM "\\|" yyyy "\\)"))
         (western-comma (concat month s "+" dd "," s "+" yyyy))
         ;; Japanese MS-Windows ls-lisp has one-digit months, and
         ;; omits the Kanji characters after month and day-of-month.
         (mm "[ 0-1]?[0-9]")
         (japanese
          (concat mm l "?" s dd l "?" s "+"
                  "\\(" HH:MM "\\|" yyyy l "?" "\\)")))
    ;; the .* below ensures that we find the last match on a line
    (concat ".*" s
            "\\(" western "\\|" western-comma "\\|" japanese "\\|" iso "\\)"
            s "+")))
  (and (boundp 'vc-dired-switches)
       vc-dired-switches
       (set (make-local-variable 'dired-actual-switches)
            vc-dired-switches))
  (set (make-local-variable 'vc-dired-terse-mode) vc-dired-terse-display)
  ;; FIXME: This needs to be factored out
  (let ((backend-name (symbol-name (vc-responsible-backend
				    default-directory))))
    (setq mode-name (concat mode-name backend-name))
    ;; Add menu after `vc-dired-mode-map' has `dired-mode-map' as the parent.
    (let ((vc-dire-menu-map (copy-keymap vc-menu-map)))
      (define-key-after (lookup-key vc-dired-mode-map [menu-bar]) [vc]
	(cons backend-name vc-dire-menu-map) 'subdir)))
  (setq vc-dired-mode t))

(defun vc-dired-toggle-terse-mode ()
  "Toggle terse display in VC Dired."
  (interactive)
  (if (not vc-dired-mode)
      nil
    (setq vc-dired-terse-mode (not vc-dired-terse-mode))
    (if vc-dired-terse-mode
        (vc-dired-hook)
      (revert-buffer))))

(defun vc-dired-mark-locked ()
  "Mark all files currently locked."
  (interactive)
  (dired-mark-if (let ((f (dired-get-filename nil t)))
		   (and f
			(not (file-directory-p f))
			(not (vc-up-to-date-p f))))
		 "locked file"))

(define-key vc-dired-mode-map "*l" 'vc-dired-mark-locked)

(defun vc-dired-reformat-line (vc-info)
  "Reformat a directory-listing line.
Replace various columns with version control information, VC-INFO.
This code, like dired, assumes UNIX -l format."
  (beginning-of-line)
  (when (re-search-forward
         ;; Match link count, owner, group, size.  Group may be missing,
         ;; and only the size is present in OS/2 -l format.
         "^..[drwxlts-]+ \\( *[0-9]+\\( [^ ]+ +\\([^ ]+ +\\)?[0-9]+\\)?\\) "
         (line-end-position) t)
      (replace-match (substring (concat vc-info "          ") 0 10)
                     t t nil 1)))

;; FIXME: VCS-specific knowledge in here needs to be factored out
(defun vc-dired-ignorable-p (filename)
  "Should FILENAME be ignored in VC-Dired listings?"
  (catch t
    ;; Ignore anything that wouldn't be found by completion (.o, .la, etc.)
    (dolist (ignorable completion-ignored-extensions)
      (let ((ext (substring filename
			      (- (length filename)
				 (length ignorable)))))
	(if (string= ignorable ext) (throw t t))))
    ;; Ignore Makefiles derived from something else
    (when (string= (file-name-nondirectory filename) "Makefile")
      (let* ((dir (file-name-directory filename))
	    (peers (directory-files (or dir default-directory))))
	(if (or (member "Makefile.in" peers) (member "Makefile.am" peers))
	   (throw t t))))
    nil))

(defun vc-dired-purge ()
  "Remove empty subdirs."
  (goto-char (point-min))
  (while (dired-get-subdir)
    (forward-line 2)
    (if (dired-get-filename nil t)
	(if (not (dired-next-subdir 1 t))
	    (goto-char (point-max)))
      (forward-line -2)
      (if (not (string= (dired-current-directory) default-directory))
	  (dired-do-kill-lines t "")
	;; We cannot remove the top level directory.
	;; Just make it look a little nicer.
	(forward-line 1)
	(or (eobp) (kill-line))
	(if (not (dired-next-subdir 1 t))
	    (goto-char (point-max))))))
  (goto-char (point-min)))

(defun vc-dired-buffers-for-dir (dir)
  "Return a list of all vc-dired buffers that currently display DIR."
  (let (result)
    ;; Check whether dired is loaded.
    (when (fboundp 'dired-buffers-for-dir)
      (dolist (buffer (dired-buffers-for-dir dir))
        (with-current-buffer buffer
          (when vc-dired-mode
	    (push buffer result)))))
    (nreverse result)))

(defun vc-directory-resynch-file (file)
  "Update the entries for FILE in any VC Dired buffers that list it."
  ;;FIXME This needs to be implemented so it works for vc-dir
  (let ((buffers (vc-dired-buffers-for-dir (file-name-directory file))))
    (when buffers
      (mapcar (lambda (buffer)
		(with-current-buffer buffer
		  (when (dired-goto-file file)
		    ;; bind vc-dired-terse-mode to nil so that
		    ;; files won't vanish when they are checked in
		    (let ((vc-dired-terse-mode nil))
		      (dired-do-redisplay 1)))))
	      buffers))))

;;;###autoload
(defun vc-directory (dir read-switches)
  "Create a buffer in VC Dired Mode for directory DIR.

See Info node `VC Dired Mode'.

With prefix arg READ-SWITCHES, specify a value to override
`dired-listing-switches' when generating the listing."
  (interactive "DDired under VC (directory): \nP")
  (let ((vc-dired-switches (concat vc-dired-listing-switches
                                   (if vc-dired-recurse "R" ""))))
    (if read-switches
        (setq vc-dired-switches
              (read-string "Dired listing switches: "
                           vc-dired-switches)))
    (require 'dired)
    (require 'dired-aux)
    (switch-to-buffer
     (dired-internal-noselect (expand-file-name (file-name-as-directory dir))
                              vc-dired-switches
                              'vc-dired-mode))))

;; VC status implementation

;; Used to store information for the files displayed in the *VC status* buffer.
;; Each item displayed corresponds to one of these defstructs.
(defstruct (vc-dir-fileinfo
            (:copier nil)
            (:type list)            ;So we can use `member' on lists of FIs.
            (:constructor
             ;; We could define it as an alias for `list'.
	     vc-dir-create-fileinfo (name state &optional extra marked directory))
            (:conc-name vc-dir-fileinfo->))
  name                                  ;Keep it as first, for `member'.
  state
  ;; For storing backend specific information.
  extra
  marked
  ;; To keep track of not updated files during a global refresh
  needs-update
  ;; To distinguish files and directories.
  directory)

(defvar vc-ewoc nil)

(defun vc-default-status-extra-headers (backend dir)
  ;; Be loud by default to remind people to add coded to display
  ;; backend specific headers.
  ;; XXX: change this to return nil before the release.
  "Extra      : Add backend specific headers here")

(defun vc-dir-headers (backend dir)
  "Display the headers in the *VC status* buffer.
It calls the `status-extra-headers' backend method to display backend
specific headers."
  (concat
   (propertize "VC backend : " 'face 'font-lock-type-face)
   (propertize (format "%s\n" backend) 'face 'font-lock-variable-name-face)
   (propertize "Working dir: " 'face 'font-lock-type-face)
   (propertize (format "%s\n" dir) 'face 'font-lock-variable-name-face)
   (vc-call-backend backend 'status-extra-headers dir)
   "\n"))

(defun vc-default-status-printer (backend fileentry)
  "Pretty print FILEENTRY."
  ;; If you change the layout here, change vc-dir-move-to-goal-column.
  (let ((state
	 (if (vc-dir-fileinfo->directory fileentry)
	     'DIRECTORY
	   (vc-dir-fileinfo->state fileentry))))
    (insert
     (propertize
      (format "%c" (if (vc-dir-fileinfo->marked fileentry) ?* ? ))
      'face 'font-lock-type-face)
     "   "
     (propertize
      (format "%-20s" state)
      'face (cond ((eq state 'up-to-date) 'font-lock-builtin-face)
		  ((memq state '(missing conflict)) 'font-lock-warning-face)
		  (t 'font-lock-variable-name-face))
      'mouse-face 'highlight)
     " "
     (propertize
      (format "%s" (vc-dir-fileinfo->name fileentry))
      'face 'font-lock-function-name-face
      'mouse-face 'highlight))))

(defun vc-dir-printer (fileentry)
  (let ((backend (vc-responsible-backend default-directory)))
    (vc-call-backend backend 'status-printer fileentry)))

(defun vc-dir-move-to-goal-column ()
  ;; Used to keep the cursor on the file name column.
  (beginning-of-line)
  ;; Must be in sync with vc-default-status-printer.
  (forward-char 25))

(defun vc-dir-prepare-status-buffer (dir &optional create-new)
  "Find a *vc-dir* buffer showing DIR, or create a new one."
  (setq dir (expand-file-name dir))
  (let* ((bname "*vc-dir*")
	 ;; Look for another *vc-dir* buffer visiting the same directory.
	 (buf (save-excursion
		(unless create-new
		  (dolist (buffer (buffer-list))
		    (set-buffer buffer)
		    (when (and (eq major-mode 'vc-dir-mode)
			       (string= (expand-file-name default-directory) dir))
		      (return buffer)))))))
    (or buf
        ;; Create a new *vc-dir* buffer.
        (with-current-buffer (create-file-buffer bname)
          (cd dir)
          (vc-setup-buffer (current-buffer))
          ;; Reset the vc-parent-buffer-name so that it does not appear
          ;; in the mode-line.
          (setq vc-parent-buffer-name nil)
          (current-buffer)))))

;;;###autoload
(defun vc-dir (dir)
  "Show the VC status for DIR."
  (interactive "DVC status for directory: ")
  (pop-to-buffer (vc-dir-prepare-status-buffer dir))
  (if (eq major-mode 'vc-dir-mode)
      (vc-dir-refresh)
    (vc-dir-mode)))

(defvar vc-dir-menu-map
  (let ((map (make-sparse-keymap "VC-dir")))
    (define-key map [quit]
      '(menu-item "Quit" quit-window
		  :help "Quit"))
    (define-key map [kill]
      '(menu-item "Kill Update Command" vc-dir-kill-dir-status-process
		  :enable (vc-dir-busy)
		  :help "Kill the command that updates VC status buffer"))
    (define-key map [refresh]
      '(menu-item "Refresh" vc-dir-refresh
		  :enable (not (vc-dir-busy))
		  :help "Refresh the contents of the VC status buffer"))
    (define-key map [remup]
      '(menu-item "Hide up-to-date" vc-dir-hide-up-to-date
		  :help "Hide up-to-date items from display"))
    ;; Movement.
    (define-key map [sepmv] '("--"))
    (define-key map [next-line]
      '(menu-item "Next line" vc-dir-next-line
		  :help "Go to the next line" :keys "n"))
    (define-key map [previous-line]
      '(menu-item "Previous line" vc-dir-previous-line
		  :help "Go to the previous line"))
    ;; Marking.
    (define-key map [sepmrk] '("--"))
    (define-key map [unmark-all]
      '(menu-item "Unmark All" vc-dir-unmark-all-files
		  :help "Unmark all files that are in the same state as the current file\
\nWith prefix argument unmark all files"))
    (define-key map [unmark-previous]
      '(menu-item "Unmark previous " vc-dir-unmark-file-up
		  :help "Move to the previous line and unmark the file"))

    (define-key map [mark-all]
      '(menu-item "Mark All" vc-dir-mark-all-files
		  :help "Mark all files that are in the same state as the current file\
\nWith prefix argument mark all files"))
    (define-key map [unmark]
      '(menu-item "Unmark" vc-dir-unmark
		  :help "Unmark the current file or all files in the region"))

    (define-key map [mark]
      '(menu-item "Mark" vc-dir-mark
		  :help "Mark the current file or all files in the region"))

    (define-key map [sepopn] '("--"))
    (define-key map [open-other]
      '(menu-item "Open in other window" vc-dir-find-file-other-window
		  :help "Find the file on the current line, in another window"))
    (define-key map [open]
      '(menu-item "Open file" vc-dir-find-file
		  :help "Find the file on the current line"))
    ;; VC info details
    (define-key map [sepvcdet] '("--"))
    ;; FIXME: This needs a key binding.  And maybe a better name
    ;; ("Insert" like PCL-CVS uses does not sound that great either)...
    (define-key map [ins]
      '(menu-item "Show File" vc-dir-show-fileentry
		  :help "Show a file in the VC status listing even though it might be up to date"))
    (define-key map [annotate]
      '(menu-item "Annotate" vc-annotate
		  :help "Display the edit history of the current file using colors"))
    (define-key map [diff]
      '(menu-item "Compare with Base Version" vc-diff
		  :help "Compare file set with the base version"))
    (define-key map [log]
     '(menu-item "Show history" vc-print-log
     :help "List the change log of the current file set in a window"))
    ;; VC commands.
    (define-key map [sepvccmd] '("--"))
    (define-key map [update]
      '(menu-item "Update to latest version" vc-update
		  :help "Update the current fileset's files to their tip revisions"))
    (define-key map [revert]
      '(menu-item "Revert to base version" vc-revert
		  :help "Revert working copies of the selected fileset to their repository contents."))
    (define-key map [next-action]
      ;; FIXME: This really really really needs a better name!
      ;; And a key binding too.
      '(menu-item "Check In/Out" vc-next-action
		  :help "Do the next logical version control operation on the current fileset"))
    (define-key map [register]
      '(menu-item "Register" vc-dir-register
		  :help "Register file set into the version control system"))
    map)
  "Menu for VC status")

(defalias 'vc-dir-menu-map vc-dir-menu-map)

(defvar vc-dir-mode-map
  (let ((map (make-keymap)))
    (suppress-keymap map)
    ;; Marking.
    (define-key map "m" 'vc-dir-mark)
    (define-key map "M" 'vc-dir-mark-all-files)
    (define-key map "u" 'vc-dir-unmark)
    (define-key map "U" 'vc-dir-unmark-all-files)
    (define-key map "\C-?" 'vc-dir-unmark-file-up)
    (define-key map "\M-\C-?" 'vc-dir-unmark-all-files)
    ;; Movement.
    (define-key map "n" 'vc-dir-next-line)
    (define-key map " " 'vc-dir-next-line)
    (define-key map "\t" 'vc-dir-next-line)
    (define-key map "p" 'vc-dir-previous-line)
    (define-key map [backtab] 'vc-dir-previous-line)
    ;; VC commands.
    (define-key map "=" 'vc-diff)   ;; C-x v =
    (define-key map "a" 'vc-dir-register)
    (define-key map "+" 'vc-update) ;; C-x v +
    (define-key map "R" 'vc-revert) ;; u is taken by unmark.

    ;; Can't be "g" (as in vc map), so "A" for "Annotate".
    (define-key map "A" 'vc-annotate)
    (define-key map "l" 'vc-print-log) ;; C-x v l
    ;; The remainder.
    (define-key map "f" 'vc-dir-find-file)
    (define-key map "\C-m" 'vc-dir-find-file)
    (define-key map "o" 'vc-dir-find-file-other-window)
    (define-key map "x" 'vc-dir-hide-up-to-date)
    (define-key map "q" 'quit-window)
    (define-key map "g" 'vc-dir-refresh)
    (define-key map "\C-c\C-c" 'vc-dir-kill-dir-status-process)
    (define-key map [(down-mouse-3)] 'vc-dir-menu)
    (define-key map [(mouse-2)] 'vc-dir-toggle-mark)

    ;; Hook up the menu.
    (define-key map [menu-bar vc-dir-mode]
      '(menu-item
	;; This is used to that VC backends could add backend specific
	;; menu items to vc-dir-menu-map.
	"VC Status" vc-dir-menu-map :filter vc-dir-menu-map-filter))
    map)
  "Keymap for VC status")

(defun vc-default-extra-status-menu (backend)
  nil)

;; This is used to that VC backends could add backend specific menu
;; items to vc-dir-menu-map.
(defun vc-dir-menu-map-filter (orig-binding)
  (when (and (symbolp orig-binding) (fboundp orig-binding))
    (setq orig-binding (indirect-function orig-binding)))
  (let ((ext-binding
	 (vc-call-backend (vc-responsible-backend default-directory)
			  'extra-status-menu)))
    (if (null ext-binding)
	orig-binding
      (append orig-binding
	      '("----")
	      ext-binding))))

(defmacro vc-at-event (event &rest body)
  "Evaluate `body' wich point located at event-start of `event'.
If `body' uses `event', it should be a variable,
 otherwise it will be evaluated twice."
  (let ((posn (gensym "vc-at-event-posn")))
    `(let ((,posn (event-start ,event)))
       (save-excursion
         (set-buffer (window-buffer (posn-window ,posn)))
         (goto-char (posn-point ,posn))
         ,@body))))

(defun vc-dir-menu (e)
  "Popup the VC status menu."
  (interactive "e")
  (vc-at-event e (popup-menu vc-dir-menu-map e)))

(defvar vc-dir-tool-bar-map
  (let ((map (make-sparse-keymap)))
    (tool-bar-local-item-from-menu 'vc-dir-find-file "open"
				   map vc-dir-mode-map)
    (tool-bar-local-item "bookmark_add"
			 'vc-dir-toggle-mark 'vc-dir-toggle-mark map
			 :help "Toggle mark on current item")
    (tool-bar-local-item-from-menu 'vc-dir-previous-line "left-arrow"
				   map vc-dir-mode-map
				   :rtl "right-arrow")
    (tool-bar-local-item-from-menu 'vc-dir-next-line "right-arrow"
				   map vc-dir-mode-map
				   :rtl "left-arrow")
    (tool-bar-local-item-from-menu 'vc-print-log "info"
				   map vc-dir-mode-map)
    (tool-bar-local-item-from-menu 'vc-dir-refresh "refresh"
				   map vc-dir-mode-map)
    (tool-bar-local-item-from-menu 'nonincremental-search-forward
				   "search" map)
    (tool-bar-local-item-from-menu 'vc-dir-kill-dir-status-process "cancel"
				   map vc-dir-mode-map)
    (tool-bar-local-item-from-menu 'quit-window "exit"
				   map vc-dir-mode-map)
    map))

(defvar vc-dir-process-buffer nil
  "The buffer used for the asynchronous call that computes the VC status.")

(defun vc-dir-mode ()
  "Major mode for showing the VC status for a directory.
Marking/Unmarking key bindings and actions:
m - marks a file/directory or ff the region is active, mark all the files
     in region.
    Restrictions: - a file cannot be marked if any parent directory is marked
                  - a directory cannot be marked if any child file or
                    directory is marked
u - marks a file/directory or if the region is active, unmark all the files
     in region.
M - if the cursor is on a file: mark all the files with the same VC state as
      the current file
  - if the cursor is on a directory: mark all child files
  - with a prefix argument: mark all files
U - if the cursor is on a file: unmark all the files with the same VC state
      as the current file
  - if the cursor is on a directory: unmark all child files
  - with a prefix argument: unmark all files


\\{vc-dir-mode-map}"
  (setq mode-name "VC Status")
  (setq major-mode 'vc-dir-mode)
  (setq buffer-read-only t)
  (use-local-map vc-dir-mode-map)
  (set (make-local-variable 'tool-bar-map) vc-dir-tool-bar-map)
  (let ((buffer-read-only nil)
	(backend (vc-responsible-backend default-directory))
	entries)
    (erase-buffer)
    (set (make-local-variable 'vc-dir-process-buffer) nil)
    (set (make-local-variable 'vc-ewoc)
	 (ewoc-create #'vc-dir-printer
		      (vc-dir-headers backend default-directory)))
    (add-hook 'after-save-hook 'vc-dir-mark-buffer-changed)
    ;; Make sure that if the VC status buffer is killed, the update
    ;; process running in the background is also killed.
    (add-hook 'kill-buffer-query-functions 'vc-dir-kill-query nil t)
    (vc-dir-refresh))
  (run-hooks 'vc-dir-mode-hook))

(put 'vc-dir-mode 'mode-class 'special)

;; t if directories should be shown in vc-dir.
;; WORK IN PROGRESS!  DO NOT SET this! ONLY set it if you want to help
;; write code for this feature.  This variable will likely disappear
;; when the work is done.
(defvar vc-dir-insert-directories nil)

(defun vc-dir-update (entries buffer &optional noinsert)
  "Update BUFFER's ewoc from the list of ENTRIES.
If NOINSERT, ignore elements on ENTRIES which are not in the ewoc."
  ;; Add ENTRIES to the vc-dir buffer BUFFER.
  (with-current-buffer buffer
    ;; Insert the entries sorted by name into the ewoc.
    ;; We assume the ewoc is sorted too, which should be the
    ;; case if we always add entries with vc-dir-update.
    (setq entries
	  ;; Sort: first files and then subdirectories.
	  ;; XXX: this is VERY inefficient, it computes the directory
	  ;; names too many times
	  (sort entries
		(lambda (entry1 entry2)
		  (let ((dir1 (file-name-directory (expand-file-name (car entry1))))
			(dir2 (file-name-directory (expand-file-name (car entry2)))))
		    (cond
		     ((string< dir1 dir2) t)
		     ((not (string= dir1 dir2)) nil)
		     ((string< (car entry1) (car entry2))))))))
    (if (not vc-dir-insert-directories)
	(let ((entry (car entries))
	      (node (ewoc-nth vc-ewoc 0)))
	  (while (and entry node)
	    (let ((entryfile (car entry))
		  (nodefile (vc-dir-fileinfo->name (ewoc-data node))))
	      (cond
	       ((string-lessp nodefile entryfile)
		(setq node (ewoc-next vc-ewoc node)))
	       ((string-lessp entryfile nodefile)
		(unless noinsert
		  (ewoc-enter-before vc-ewoc node
				     (apply 'vc-dir-create-fileinfo entry)))
		(setq entries (cdr entries) entry (car entries)))
	       (t
		(setf (vc-dir-fileinfo->state (ewoc-data node)) (nth 1 entry))
		(setf (vc-dir-fileinfo->extra (ewoc-data node)) (nth 2 entry))
		(setf (vc-dir-fileinfo->needs-update (ewoc-data node)) nil)
		(ewoc-invalidate vc-ewoc node)
		(setq entries (cdr entries) entry (car entries))
		(setq node (ewoc-next vc-ewoc node))))))
	  (unless (or node noinsert)
	    ;; We're past the last node, all remaining entries go to the end.
	    (while entries
	      (ewoc-enter-last vc-ewoc
			       (apply 'vc-dir-create-fileinfo (pop entries))))))
  ;; Insert directory entries in the right places.
  (let ((entry (car entries))
	(node (ewoc-nth vc-ewoc 0)))
    ;; Insert . if it is not present.
    (unless node
      (let ((rd (file-relative-name default-directory)))
	(ewoc-enter-last
	 vc-ewoc (vc-dir-create-fileinfo
		  rd nil nil nil (expand-file-name default-directory))))
      (setq node (ewoc-nth vc-ewoc 0)))

    (while (and entry node)
      (let* ((entryfile (car entry))
	     (entrydir (file-name-directory (expand-file-name entryfile)))
	     (nodedir
	      (or (vc-dir-fileinfo->directory (ewoc-data node))
		  (file-name-directory
		       (expand-file-name
			(vc-dir-fileinfo->name (ewoc-data node)))))))
	(cond
	 ;; First try to find the directory.
	 ((string-lessp nodedir entrydir)
	  (setq node (ewoc-next vc-ewoc node)))
	 ((string-equal nodedir entrydir)
	  ;; Found the directory, find the place for the file name.
	  (let ((nodefile (vc-dir-fileinfo->name (ewoc-data node))))
	    (cond
	     ((string-lessp nodefile entryfile)
	      (setq node (ewoc-next vc-ewoc node)))
	      ((string-equal nodefile entryfile)
	       (setf (vc-dir-fileinfo->state (ewoc-data node)) (nth 1 entry))
	       (setf (vc-dir-fileinfo->extra (ewoc-data node)) (nth 2 entry))
	       (setf (vc-dir-fileinfo->needs-update (ewoc-data node)) nil)
	       (ewoc-invalidate vc-ewoc node)
	       (setq entries (cdr entries) entry (car entries))
	       (setq node (ewoc-next vc-ewoc node)))
	      (t
	       (ewoc-enter-before vc-ewoc node
				  (apply 'vc-dir-create-fileinfo entry))
	       (setq entries (cdr entries) entry (car entries))))))
	 (t
	  ;; We need to insert a directory node
	  (let ((rd (file-relative-name entrydir)))
	    (ewoc-enter-last
	     vc-ewoc (vc-dir-create-fileinfo rd nil nil nil entrydir)))
	  ;; Now insert the node itself.
	  (ewoc-enter-before vc-ewoc node
			     (apply 'vc-dir-create-fileinfo entry))
	  (setq entries (cdr entries) entry (car entries))))))
    ;; We're past the last node, all remaining entries go to the end.
    (unless (or node noinsert)
      (let* ((lastnode (ewoc-nth vc-ewoc -1))
	     (lastdir
	      (or (vc-dir-fileinfo->directory (ewoc-data lastnode))
		  (file-name-directory
		       (expand-file-name
			(vc-dir-fileinfo->name (ewoc-data lastnode)))))))
	(dolist (entry entries)
	  (let ((entrydir (file-name-directory (expand-file-name (car entry)))))
	    ;; Insert a directory node if needed.
	    (unless (string-equal lastdir entrydir)
	      (setq lastdir entrydir)
	      (let ((rd (file-relative-name entrydir)))
		(ewoc-enter-last
		 vc-ewoc (vc-dir-create-fileinfo rd nil nil nil entrydir))))
	    ;; Now insert the node itself.
	    (ewoc-enter-last vc-ewoc
			     (apply 'vc-dir-create-fileinfo entry))))))))))

(defun vc-dir-busy ()
  (and (buffer-live-p vc-dir-process-buffer)
       (get-buffer-process vc-dir-process-buffer)))

(defun vc-dir-refresh-files (files default-state)
  "Refresh some files in the VC status buffer."
  (let ((backend (vc-responsible-backend default-directory))
        (status-buffer (current-buffer))
        (def-dir default-directory))
    (vc-set-mode-line-busy-indicator)
    ;; Call the `dir-status-file' backend function.
    ;; `dir-status-file' is supposed to be asynchronous.
    ;; It should compute the results, and then call the function
    ;; passed as an argument in order to update the vc-dir buffer
    ;; with the results.
    (unless (buffer-live-p vc-dir-process-buffer)
      (setq vc-dir-process-buffer
            (generate-new-buffer (format " *VC-%s* tmp status" backend))))
    (lexical-let ((buffer (current-buffer)))
      (with-current-buffer vc-dir-process-buffer
        (cd def-dir)
        (erase-buffer)
        (vc-call-backend
         backend 'dir-status-files def-dir files default-state
         (lambda (entries &optional more-to-come)
           ;; ENTRIES is a list of (FILE VC_STATE EXTRA) items.
           ;; If MORE-TO-COME is true, then more updates will come from
           ;; the asynchronous process.
           (with-current-buffer buffer
             (vc-dir-update entries buffer)
             (unless more-to-come
               (setq mode-line-process nil)
               ;; Remove the ones that haven't been updated at all.
               ;; Those not-updated are those whose state is nil because the
               ;; file/dir doesn't exist and isn't versioned.
               (ewoc-filter vc-ewoc
                            (lambda (info)
                              (not (vc-dir-fileinfo->needs-update info))))))))))))

(defun vc-dir-refresh ()
  "Refresh the contents of the VC status buffer.
Throw an error if another update process is in progress."
  (interactive)
  (if (vc-dir-busy)
      (error "Another update process is in progress, cannot run two at a time")
    (let ((backend (vc-responsible-backend default-directory))
	  (status-buffer (current-buffer))
	  (def-dir default-directory))
      (vc-set-mode-line-busy-indicator)
      ;; Call the `dir-status' backend function.
      ;; `dir-status' is supposed to be asynchronous.
      ;; It should compute the results, and then call the function
      ;; passed as an argument in order to update the vc-dir buffer
      ;; with the results.

      ;; Create a buffer that can be used by `dir-status' and call
      ;; `dir-status' with this buffer as the current buffer.  Use
      ;; `vc-dir-process-buffer' to remember this buffer, so that
      ;; it can be used later to kill the update process in case it
      ;; takes too long.
      (unless (buffer-live-p vc-dir-process-buffer)
        (setq vc-dir-process-buffer
              (generate-new-buffer (format " *VC-%s* tmp status" backend))))
      ;; set the needs-update flag on all entries
      (ewoc-map (lambda (info) (setf (vc-dir-fileinfo->needs-update info) t) nil)
                vc-ewoc)
      (lexical-let ((buffer (current-buffer)))
        (with-current-buffer vc-dir-process-buffer
          (cd def-dir)
          (erase-buffer)
          (vc-call-backend
           backend 'dir-status def-dir
           (lambda (entries &optional more-to-come)
             ;; ENTRIES is a list of (FILE VC_STATE EXTRA) items.
             ;; If MORE-TO-COME is true, then more updates will come from
             ;; the asynchronous process.
             (with-current-buffer buffer
               (vc-dir-update entries buffer)
               (unless more-to-come
                 (let ((remaining
                        (ewoc-collect
                         vc-ewoc 'vc-dir-fileinfo->needs-update)))
                   (if remaining
                       (vc-dir-refresh-files
                        (mapcar 'vc-dir-fileinfo->name remaining)
                        'up-to-date)
                     (setq mode-line-process nil))))))))))))

(defun vc-dir-kill-dir-status-process ()
  "Kill the temporary buffer and associated process."
  (interactive)
  (when (buffer-live-p vc-dir-process-buffer)
    (let ((proc (get-buffer-process vc-dir-process-buffer)))
      (when proc (delete-process proc))
      (setq vc-dir-process-buffer nil)
      (setq mode-line-process nil))))

(defun vc-dir-kill-query ()
  ;; Make sure that when the VC status buffer is killed the update
  ;; process running in background is also killed.
  (if (vc-dir-busy)
    (when (y-or-n-p "Status update process running, really kill status buffer?")
      (vc-dir-kill-dir-status-process)
      t)
    t))

(defun vc-dir-next-line (arg)
  "Go to the next line.
If a prefix argument is given, move by that many lines."
  (interactive "p")
  (ewoc-goto-next vc-ewoc arg)
  (vc-dir-move-to-goal-column))

(defun vc-dir-previous-line (arg)
  "Go to the previous line.
If a prefix argument is given, move by that many lines."
  (interactive "p")
  (ewoc-goto-prev vc-ewoc arg)
  (vc-dir-move-to-goal-column))

(defun vc-dir-mark-unmark (mark-unmark-function)
  (if (use-region-p)
      (let ((firstl (line-number-at-pos (region-beginning)))
	    (lastl (line-number-at-pos (region-end))))
	(save-excursion
	  (goto-char (region-beginning))
	  (while (<= (line-number-at-pos) lastl)
	    (funcall mark-unmark-function))))
    (funcall mark-unmark-function)))

(defun vc-dir-parent-marked-p (arg)
  (when vc-dir-insert-directories
    ;; Return nil if none of the parent directories of arg is marked.
    (let* ((argdata (ewoc-data arg))
	   (argdir
	    (let ((crtdir (vc-dir-fileinfo->directory argdata)))
	      (if crtdir
		  crtdir
		(file-name-directory (expand-file-name
				      (vc-dir-fileinfo->name argdata))))))
	   (arglen (length argdir))
	   (crt arg)
	   data dir)
      ;; Go through the predecessors, checking if any directory that is
      ;; a parent is marked.
      (while (setq crt (ewoc-prev vc-ewoc crt))
	(setq data (ewoc-data crt))
	(setq dir
	      (let ((crtdir (vc-dir-fileinfo->directory data)))
		(if crtdir
		    crtdir
		  (file-name-directory (expand-file-name
					(vc-dir-fileinfo->name data))))))

	(when (and (vc-dir-fileinfo->directory data)
		   (string-equal (substring argdir 0 (length dir)) dir))
	  (when (vc-dir-fileinfo->marked data)
	    (error "Cannot mark `%s', parent directory `%s' marked"
		   (vc-dir-fileinfo->name argdata)
		   (vc-dir-fileinfo->name data)))))
      nil)))

(defun vc-dir-children-marked-p (arg)
  ;; Return nil if none of the children of arg is marked.
  (when vc-dir-insert-directories
    (let* ((argdata (ewoc-data arg))
	   (argdir (vc-dir-fileinfo->directory argdata))
	   (arglen (length argdir))
	   (is-child t)
	   (crt arg)
	   data dir)
      (while (and is-child (setq crt (ewoc-next vc-ewoc crt)))
	(setq data (ewoc-data crt))
	(setq dir
	      (let ((crtdir (vc-dir-fileinfo->directory data)))
		(if crtdir
		    crtdir
		  (file-name-directory (expand-file-name
					(vc-dir-fileinfo->name data))))))
	(if (string-equal argdir (substring dir 0 arglen))
	    (when (vc-dir-fileinfo->marked data)
	      (error "Cannot mark `%s', child `%s' marked"
		     (vc-dir-fileinfo->name argdata)
		     (vc-dir-fileinfo->name data)))
	  ;; We are done, we got to an entry that is not a child of `arg'.
	  (setq is-child nil)))
      nil)))

(defun vc-dir-mark-file (&optional arg)
  ;; Mark ARG or the current file and move to the next line.
  (let* ((crt (or arg (ewoc-locate vc-ewoc)))
         (file (ewoc-data crt))
	 (isdir (vc-dir-fileinfo->directory file)))
    (when (or (and isdir (not (vc-dir-children-marked-p crt)))
	      (and (not isdir) (not (vc-dir-parent-marked-p crt))))
      (setf (vc-dir-fileinfo->marked file) t)
      (ewoc-invalidate vc-ewoc crt)
      (unless (or arg (mouse-event-p last-command-event))
	(vc-dir-next-line 1)))))

(defun vc-dir-mark ()
  "Mark the current file or all files in the region.
If the region is active, mark all the files in the region.
Otherwise mark the file on the current line and move to the next
line."
  (interactive)
  (vc-dir-mark-unmark 'vc-dir-mark-file))

(defun vc-dir-mark-all-files (arg)
  "Mark all files with the same state as the current one.
With a prefix argument mark all files.
If the current entry is a directory, mark all child files.

The VC commands operate on files that are on the same state.
This command is intended to make it easy to select all files that
share the same state."
  (interactive "P")
  (if arg
      ;; Mark all files.
      (progn
	;; First check that no directory is marked, we can't mark
	;; files in that case.
	(ewoc-map
	 (lambda (filearg)
	   (when (and (vc-dir-fileinfo->directory filearg)
		      (vc-dir-fileinfo->directory filearg))
	     (error "Cannot mark all files, directory `%s' marked"
		    (vc-dir-fileinfo->name filearg))))
	 vc-ewoc)
	(ewoc-map
	 (lambda (filearg)
	   (unless (vc-dir-fileinfo->marked filearg)
	     (setf (vc-dir-fileinfo->marked filearg) t)
	     t))
	 vc-ewoc))
    (let ((data (ewoc-data (ewoc-locate vc-ewoc))))
      (if (vc-dir-fileinfo->directory data)
	  ;; It's a directory, mark child files.
	  (let ((crt (ewoc-locate vc-ewoc)))
	    (unless (vc-dir-children-marked-p crt)
	      (while (setq crt (ewoc-next vc-ewoc crt))
		(let ((crt-data (ewoc-data crt)))
		  (unless (vc-dir-fileinfo->directory crt-data)
		    (setf (vc-dir-fileinfo->marked crt-data) t)
		    (ewoc-invalidate vc-ewoc crt))))))
	;; It's a file
	(let ((state (vc-dir-fileinfo->state data))
	      (crt (ewoc-nth vc-ewoc 0)))
	  (while crt
	    (let ((crt-data (ewoc-data crt)))
	      (when (and (not (vc-dir-fileinfo->marked crt-data))
			 (eq (vc-dir-fileinfo->state crt-data) state)
			 (not (vc-dir-fileinfo->directory crt-data)))
		(vc-dir-mark-file crt)))
	    (setq crt (ewoc-next vc-ewoc crt))))))))

(defun vc-dir-unmark-file ()
  ;; Unmark the current file and move to the next line.
  (let* ((crt (ewoc-locate vc-ewoc))
         (file (ewoc-data crt)))
    (setf (vc-dir-fileinfo->marked file) nil)
    (ewoc-invalidate vc-ewoc crt)
    (unless (mouse-event-p last-command-event)
      (vc-dir-next-line 1))))

(defun vc-dir-unmark ()
  "Unmark the current file or all files in the region.
If the region is active, unmark all the files in the region.
Otherwise mark the file on the current line and move to the next
line."
  (interactive)
  (vc-dir-mark-unmark 'vc-dir-unmark-file))

(defun vc-dir-unmark-file-up ()
  "Move to the previous line and unmark the file."
  (interactive)
  ;; If we're on the first line, we won't move up, but we will still
  ;; remove the mark.  This seems a bit odd but it is what buffer-menu
  ;; does.
  (let* ((prev (ewoc-goto-prev vc-ewoc 1))
	 (file (ewoc-data prev)))
    (setf (vc-dir-fileinfo->marked file) nil)
    (ewoc-invalidate vc-ewoc prev)
    (vc-dir-move-to-goal-column)))

(defun vc-dir-unmark-all-files (arg)
  "Unmark all files with the same state as the current one.
With a prefix argument unmark all files.
If the current entry is a directory, unmark all the child files.

The VC commands operate on files that are on the same state.
This command is intended to make it easy to deselect all files
that share the same state."
  (interactive "P")
  (if arg
      (ewoc-map
       (lambda (filearg)
	 (when (vc-dir-fileinfo->marked filearg)
	   (setf (vc-dir-fileinfo->marked filearg) nil)
	   t))
       vc-ewoc)
    (let* ((crt (ewoc-locate vc-ewoc))
	   (data (ewoc-data crt)))
      (if (vc-dir-fileinfo->directory data)
	  ;; It's a directory, unmark child files.
	  (while (setq crt (ewoc-next vc-ewoc crt))
	    (let ((crt-data (ewoc-data crt)))
	      (unless (vc-dir-fileinfo->directory crt-data)
		(setf (vc-dir-fileinfo->marked crt-data) nil)
		(ewoc-invalidate vc-ewoc crt))))
	;; It's a file
	(let ((crt-state (vc-dir-fileinfo->state (ewoc-data crt))))
	  (ewoc-map
	   (lambda (filearg)
	     (when (and (vc-dir-fileinfo->marked filearg)
			(eq (vc-dir-fileinfo->state filearg) crt-state))
	       (setf (vc-dir-fileinfo->marked filearg) nil)
	       t))
	   vc-ewoc))))))

(defun vc-dir-toggle-mark-file ()
  (let* ((crt (ewoc-locate vc-ewoc))
         (file (ewoc-data crt)))
    (if (vc-dir-fileinfo->marked file)
	(vc-dir-unmark-file)
      (vc-dir-mark-file))))

(defun vc-dir-toggle-mark (e)
  (interactive "e")
  (vc-at-event e (vc-dir-mark-unmark 'vc-dir-toggle-mark-file)))

(defun vc-dir-register ()
  "Register the marked files, or the current file if no marks."
  (interactive)
  ;; FIXME: Just pass the fileset to vc-register.
  (mapc (lambda (arg) (vc-register nil arg))
	(or (vc-dir-marked-files) (list (vc-dir-current-file)))))

(defun vc-dir-delete-file ()
  "Delete the marked files, or the current file if no marks."
  (interactive)
  (mapc 'vc-delete-file (or (vc-dir-marked-files)
                            (list (vc-dir-current-file)))))

(defun vc-dir-show-fileentry (file)
  "Insert an entry for a specific file into the current VC status listing.
This is typically used if the file is up-to-date (or has been added
outside of VC) and one wants to do some operation on it."
  (interactive "fShow file: ")
  (vc-dir-update (list (list (file-relative-name file) (vc-state file))) (current-buffer)))

(defun vc-dir-find-file ()
  "Find the file on the current line."
  (interactive)
  (find-file (vc-dir-current-file)))

(defun vc-dir-find-file-other-window ()
  "Find the file on the current line, in another window."
  (interactive)
  (find-file-other-window (vc-dir-current-file)))

(defun vc-dir-current-file ()
  (let ((node (ewoc-locate vc-ewoc)))
    (unless node
      (error "No file available."))
    (expand-file-name (vc-dir-fileinfo->name (ewoc-data node)))))

(defun vc-dir-marked-files ()
  "Return the list of marked files."
  (mapcar
   (lambda (elem) (expand-file-name (vc-dir-fileinfo->name elem)))
   (ewoc-collect vc-ewoc 'vc-dir-fileinfo->marked)))

(defun vc-dir-marked-only-files ()
  "Return the list of marked files, for marked directories, return child files."

  (let ((crt (ewoc-nth vc-ewoc 0))
	result)
    (while crt
      (let ((crt-data (ewoc-data crt)))
	(if (vc-dir-fileinfo->marked crt-data)
	    (if (vc-dir-fileinfo->directory crt-data)
		(let* ((dir (vc-dir-fileinfo->directory crt-data))
		       (dirlen (length dir))
		       data)
		  (while
		      (and (setq crt (ewoc-next vc-ewoc crt))
			   (string-equal
			    (substring
			     (progn
			       (setq data (ewoc-data crt))
			       (let ((crtdir (vc-dir-fileinfo->directory data)))
				 (if crtdir
				     crtdir
				   (file-name-directory
				    (expand-file-name
				     (vc-dir-fileinfo->name data))))))
			     0 dirlen)
			    dir))
		    (unless (vc-dir-fileinfo->directory data)
		      (push (vc-dir-fileinfo->name data) result))))
	      (push (expand-file-name (vc-dir-fileinfo->name crt-data)) result)
	      (setq crt (ewoc-next vc-ewoc crt)))
	  (setq crt (ewoc-next vc-ewoc crt)))))
    result))

(defun vc-dir-hide-up-to-date ()
  "Hide up-to-date items from display."
  (interactive)
  (ewoc-filter
   vc-ewoc
   (lambda (crt) (not (eq (vc-dir-fileinfo->state crt) 'up-to-date)))))

;; FIXME: VCS-specific concept of backend needs to be factored out
(defun vc-default-status-fileinfo-extra (backend file)
  nil)

(defun vc-dir-mark-buffer-changed (&optional fname)
  (let* ((file (or fname (expand-file-name buffer-file-name)))
	 (found-vc-dir-buf nil))
    (save-excursion
      (dolist (status-buf (buffer-list))
	(set-buffer status-buf)
	;; look for a vc-dir buffer that might show this file.
	(when (eq major-mode 'vc-dir-mode)
	  (setq found-vc-dir-buf t)
	  (let ((ddir (expand-file-name default-directory)))
	    ;; FIXME: VCS-specific stuff needs to be factored out.
	    ;; This test is cvs-string-prefix-p
	    (when (eq t (compare-strings file nil (length ddir) ddir nil nil))
	      (let*
		  ((file-short (substring file (length ddir)))
		   (backend (vc-backend file))
		   (state (and backend (vc-state file)))
		   (extra
		    (and backend
			 (vc-call-backend backend 'status-fileinfo-extra file)))
		   (entry
		    (list file-short (if state state 'unregistered) extra)))
		(vc-dir-update (list entry) status-buf))))))
      ;; We didn't find any vc-dir buffers, remove the hook, it is
      ;; not needed.
      (unless found-vc-dir-buf (remove-hook 'after-save-hook 'vc-dir-mark-buffer-changed)))))

;; These things should probably be generally available

(defun vc-file-tree-walk (dirname func &rest args)
  "Walk recursively through DIRNAME.
Invoke FUNC f ARGS on each VC-managed file f underneath it."
  (vc-file-tree-walk-internal (expand-file-name dirname) func args)
  (message "Traversing directory %s...done" dirname))

(defun vc-file-tree-walk-internal (file func args)
  (if (not (file-directory-p file))
      (when (vc-backend file) (apply func file args))
    (message "Traversing directory %s..." (abbreviate-file-name file))
    (let ((dir (file-name-as-directory file)))
      (mapcar
       (lambda (f) (or
               (string-equal f ".")
               (string-equal f "..")
               (member f vc-directory-exclusion-list)
               (let ((dirf (expand-file-name f dir)))
                 (or
                  (file-symlink-p dirf) ;; Avoid possible loops.
                  (vc-file-tree-walk-internal dirf func args)))))
       (directory-files dir)))))