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+;;; vc-mcvs.el --- VC backend for the Meta-CVS version-control system
+
+;; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
+;;   Free Software Foundation, Inc.
+
+;; Author:      FSF (see vc.el for full credits)
+;; Maintainer:  None
+
+;; 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 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; ********** READ THIS! **********
+;;
+;; This file apparently does not work with the new (as of Emacs 23)
+;; VC code.  Use at your own risk.  Please contact emacs-devel if you
+;; can maintain this file and update it to work correctly.
+;;
+;; ********** READ THIS! **********
+
+;; This file has been obsolete and unsupported since Emacs 23.1.
+
+
+;; The home page of the Meta-CVS version control system is at
+;;
+;;      http://users.footprints.net/~kaz/mcvs.html
+;;
+;; This is derived from vc-cvs.el as follows:
+;; - cp vc-cvs.el vc-mcvs.el
+;; - Replace CVS/ with MCVS/CVS/
+;; - Replace 'CVS with 'MCVS
+;; - Replace -cvs- with -mcvs-
+;; - Replace most of the rest of CVS to Meta-CVS
+;;
+;; Then of course started the hacking.  Only a small part of the code
+;; has been touched and not much more than that was tested, so if
+;; you bump into a bug, don't be surprised: just report it to me.
+;;
+;; What has been partly tested:
+;; - C-x v v to start editing a file that was checked out with CVSREAD on.
+;; - C-x v v to commit a file
+;; - C-x v =
+;; - C-x v l
+;; - C-x v i
+;; - C-x v g
+;; - M-x vc-rename-file RET
+
+;;; Bugs:
+
+;; - Retrieving tags doesn't filter `cvs update' output and thus
+;;   parses bogus filenames.  Don't know if it harms.
+
+;;; Code:
+
+(eval-when-compile (require 'vc))
+(require 'vc-cvs)
+
+;;;
+;;; Customization options
+;;;
+
+(defcustom vc-mcvs-global-switches nil
+  "Global switches to pass to any Meta-CVS command."
+  :type '(choice (const :tag "None" nil)
+		 (string :tag "Argument String")
+		 (repeat :tag "Argument List" :value ("") string))
+  :version "22.1"
+  :group 'vc)
+
+(defcustom vc-mcvs-register-switches nil
+  "Switches for registering a file into Meta-CVS.
+A string or list of strings passed to the checkin program by
+\\[vc-register].  If nil, use the value of `vc-register-switches'.
+If t, use no switches."
+  :type '(choice (const :tag "Unspecified" nil)
+		 (const :tag "None" t)
+		 (string :tag "Argument String")
+		 (repeat :tag "Argument List" :value ("") string))
+  :version "22.1"
+  :group 'vc)
+
+(defcustom vc-mcvs-diff-switches nil
+  "String or list of strings specifying switches for Meta-CVS diff under VC.
+If nil, use the value of `vc-diff-switches'.  If t, use no switches."
+  :type '(choice (const :tag "Unspecified" nil)
+		 (const :tag "None" t)
+		 (string :tag "Argument String")
+		 (repeat :tag "Argument List" :value ("") string))
+  :version "22.1"
+  :group 'vc)
+
+(defcustom vc-mcvs-header (or (cdr (assoc 'MCVS vc-header-alist))
+			      vc-cvs-header)
+  "Header keywords to be inserted by `vc-insert-headers'."
+  :version "22.1"
+  :type '(repeat string)
+  :group 'vc)
+
+(defcustom vc-mcvs-use-edit vc-cvs-use-edit
+  "Non-nil means to use `cvs edit' to \"check out\" a file.
+This is only meaningful if you don't use the implicit checkout model
+\(i.e. if you have $CVSREAD set)."
+  :type 'boolean
+  :version "22.1"
+  :group 'vc)
+
+;;; Properties of the backend
+
+(defalias 'vc-mcvs-revision-granularity 'vc-cvs-revision-granularity)
+(defalias 'vc-mcvs-checkout-model 'vc-cvs-checkout-model)
+
+;;;
+;;; State-querying functions
+;;;
+
+;;;###autoload (defun vc-mcvs-registered (file)
+;;;###autoload   (if (vc-find-root file "MCVS/CVS")
+;;;###autoload       (progn
+;;;###autoload         (load "vc-mcvs")
+;;;###autoload         (vc-mcvs-registered file))))
+
+(defun vc-mcvs-root (file)
+  "Return the root directory of a Meta-CVS project, if any."
+  (or (vc-file-getprop file 'mcvs-root)
+      (vc-file-setprop file 'mcvs-root (vc-find-root file "MCVS/CVS"))))
+
+(defun vc-mcvs-read (file)
+  (if (file-readable-p file)
+      (with-temp-buffer
+	(insert-file-contents file)
+	(goto-char (point-min))
+	(read (current-buffer)))))
+
+(defun vc-mcvs-map-file (dir file)
+  (let ((map (vc-mcvs-read (expand-file-name "MCVS/MAP" dir)))
+	inode)
+    (dolist (x map inode)
+      (if (equal (nth 2 x) file) (setq inode (nth 1 x))))))
+
+(defun vc-mcvs-registered (file)
+  (let (root inode cvsfile)
+    (when (and (setq root (vc-mcvs-root file))
+	       (setq inode (vc-mcvs-map-file
+			    root (file-relative-name file root))))
+      (vc-file-setprop file 'mcvs-inode inode)
+      ;; Avoid calling `mcvs diff' in vc-workfile-unchanged-p.
+      (vc-file-setprop file 'vc-checkout-time
+		       (if (vc-cvs-registered
+			    (setq cvsfile (expand-file-name inode root)))
+			   (vc-file-getprop cvsfile 'vc-checkout-time)
+			 ;; The file might not be registered yet because
+			 ;; of lazy-adding.
+			 0))
+      t)))
+
+(defun vc-mcvs-state (file)
+  ;; This would assume the Meta-CVS sandbox is synchronized.
+  ;; (vc-mcvs-cvs state file))
+  "Meta-CVS-specific version of `vc-state'."
+  (if (vc-stay-local-p file)
+      (let ((state (vc-file-getprop file 'vc-state)))
+        ;; If we should stay local, use the heuristic but only if
+        ;; we don't have a more precise state already available.
+	(if (memq state '(up-to-date edited))
+	    (vc-mcvs-state-heuristic file)
+	  state))
+    (with-temp-buffer
+      (setq default-directory (vc-mcvs-root file))
+      (vc-mcvs-command t 0 file "status")
+      (vc-cvs-parse-status t))))
+
+
+(defalias 'vc-mcvs-state-heuristic 'vc-cvs-state-heuristic)
+
+(defun vc-mcvs-working-revision (file)
+  (vc-cvs-working-revision
+   (expand-file-name (vc-file-getprop file 'mcvs-inode)
+		     (vc-file-getprop file 'mcvs-root))))
+
+;;;
+;;; State-changing functions
+;;;
+
+(defun vc-mcvs-register (files &optional rev comment)
+  "Register FILES into the Meta-CVS version-control system.
+COMMENT can be used to provide an initial description of FILE.
+Passes either `vc-mcvs-register-switches' or `vc-register-switches'
+to the Meta-CVS command."
+  ;; FIXME: multiple-file case should be made to work.
+  (if (> (length files) 1) (error "Registering filesets is not yet supported."))
+  (let* ((file (car files))
+	 (filename (file-name-nondirectory file))
+	 (extpos (string-match "\\." filename))
+	 (ext (if extpos (substring filename (1+ extpos))))
+	 (root (vc-mcvs-root file))
+	 (types-file (expand-file-name "MCVS/TYPES" root))
+	 (map-file (expand-file-name "MCVS/MAP" root))
+	 (types (vc-mcvs-read types-file)))
+    ;; Make sure meta files like MCVS/MAP are not read-only (happens with
+    ;; CVSREAD) since Meta-CVS doesn't pay attention to it at all and goes
+    ;; belly-up.
+    (unless (file-writable-p map-file)
+      (vc-checkout map-file t))
+    (unless (or (file-writable-p types-file) (not (file-exists-p types-file)))
+      (vc-checkout types-file t))
+    ;; Make sure the `mcvs add' will not fire up the CVSEDITOR
+    ;; to add a rule for the given file's extension.
+    (when (and ext (not (assoc ext types)))
+      (let ((type (completing-read "Type to use (default): "
+				   '("default" "name-only" "keep-old"
+				     "binary" "value-only")
+				   nil t nil nil "default")))
+	(push (list ext (make-symbol (upcase (concat ":" type)))) types)
+	(setq types (sort types (lambda (x y) (string< (car x) (car y)))))
+	(with-current-buffer (find-file-noselect types-file)
+	  (erase-buffer)
+	  (pp types (current-buffer))
+	  (save-buffer)
+	  (unless (get-buffer-window (current-buffer) t)
+	    (kill-buffer (current-buffer))))))
+    ;; Now do the ADD.
+    (prog1 (apply 'vc-mcvs-command nil 0 file
+                  "add"
+                  (and comment (string-match "[^\t\n ]" comment)
+                       (concat "-m" comment))
+                  (vc-switches 'MCVS 'register))
+      ;; I'm not sure exactly why, but if we don't setup the inode and root
+      ;; prop of the file, things break later on in vc-mode-line that
+      ;; ends up calling vc-mcvs-working-revision.
+      ;; We also need to set vc-checkout-time so that vc-workfile-unchanged-p
+      ;; doesn't try to call `mcvs diff' on the file.
+      (vc-mcvs-registered file))))
+
+(defalias 'vc-mcvs-responsible-p 'vc-mcvs-root
+  "Return non-nil if CVS thinks it is responsible for FILE.")
+
+(defalias 'vc-cvs-could-register 'vc-cvs-responsible-p
+  "Return non-nil if FILE could be registered in Meta-CVS.
+This is only possible if Meta-CVS is responsible for FILE's directory.")
+
+(defun vc-mcvs-checkin (files rev comment)
+  "Meta-CVS-specific version of `vc-backend-checkin'."
+  (unless (or (not rev) (vc-mcvs-valid-revision-number-p rev))
+    (if (not (vc-mcvs-valid-symbolic-tag-name-p rev))
+	(error "%s is not a valid symbolic tag name" rev)
+      ;; If the input revision is a valid symbolic tag name, we create it
+      ;; as a branch, commit and switch to it.
+      ;; This file-specific form of branching is deprecated.
+      ;; We can't use `mcvs branch' and `mcvs switch' because they cannot
+      ;; be applied just to this one file.
+      (apply 'vc-mcvs-command nil 0 files "tag" "-b" (list rev))
+      (apply 'vc-mcvs-command nil 0 files "update" "-r" (list rev))
+      (mapc (lambda (file) (vc-file-setprop file 'vc-mcvs-sticky-tag rev))
+	    files)
+      (setq rev nil)))
+  ;; This commit might cvs-commit several files (e.g. MAP and TYPES)
+  ;; so using numbered revs here is dangerous and somewhat meaningless.
+  (when rev (error "Cannot commit to a specific revision number"))
+  (let ((status (apply 'vc-mcvs-command nil 1 files
+		       "ci" "-m" comment
+		       (vc-switches 'MCVS 'checkin))))
+    (set-buffer "*vc*")
+    (goto-char (point-min))
+    (when (not (zerop status))
+      ;; Check checkin problem.
+      (cond
+       ((re-search-forward "Up-to-date check failed" nil t)
+	(mapc (lambda (file) (vc-file-setprop file 'vc-state 'needs-merge))
+	      files)
+        (error "%s" (substitute-command-keys
+                (concat "Up-to-date check failed: "
+                        "type \\[vc-next-action] to merge in changes"))))
+       (t
+        (pop-to-buffer (current-buffer))
+        (goto-char (point-min))
+        (shrink-window-if-larger-than-buffer)
+        (error "Check-in failed"))))
+    ;; Single-file commit?  Then update the revision by parsing the buffer.
+    ;; Otherwise we can't necessarily tell what goes with what; clear
+    ;; its properties so they have to be refetched.
+    (if (= (length files) 1)
+	(vc-file-setprop
+	 (car files) 'vc-working-revision
+	 (vc-parse-buffer "^\\(new\\|initial\\) revision: \\([0-9.]+\\)" 2))
+      (mapc (lambda (file) (vc-file-clearprops file)) files))
+    ;; Anyway, forget the checkout model of the file, because we might have
+    ;; guessed wrong when we found the file.  After commit, we can
+    ;; tell it from the permissions of the file (see
+    ;; vc-mcvs-checkout-model).
+    (mapc (lambda (file) (vc-file-setprop file 'vc-checkout-model nil))
+	    files)
+
+    ;; if this was an explicit check-in (does not include creation of
+    ;; a branch), remove the sticky tag.
+    (if (and rev (not (vc-mcvs-valid-symbolic-tag-name-p rev)))
+	(vc-mcvs-command nil 0 files "update" "-A"))))
+
+(defun vc-mcvs-find-revision (file rev buffer)
+  (apply 'vc-mcvs-command
+	 buffer 0 file
+	 "-Q"				; suppress diagnostic output
+	 "update"
+	 (and rev (not (string= rev ""))
+	      (concat "-r" rev))
+	 "-p"
+	 (vc-switches 'MCVS 'checkout)))
+
+(defun vc-mcvs-checkout (file &optional editable rev)
+  (message "Checking out %s..." file)
+  (with-current-buffer (or (get-file-buffer file) (current-buffer))
+    (vc-mcvs-update file editable rev (vc-switches 'MCVS 'checkout)))
+  (vc-mode-line file)
+  (message "Checking out %s...done" file))
+
+(defun vc-mcvs-update (file editable rev switches)
+  (if (and (file-exists-p file) (not rev))
+      ;; If no revision was specified, just make the file writable
+      ;; if necessary (using `cvs-edit' if requested).
+      (and editable (not (eq (vc-mcvs-checkout-model (list file)) 'implicit))
+	   (if vc-mcvs-use-edit
+	       (vc-mcvs-command nil 0 file "edit")
+	     (set-file-modes file (logior (file-modes file) 128))
+	     (if (equal file buffer-file-name) (toggle-read-only -1))))
+    ;; Check out a particular revision (or recreate the file).
+    (vc-file-setprop file 'vc-working-revision nil)
+    (apply 'vc-mcvs-command nil 0 file
+	   (if editable "-w")
+	   "update"
+	   ;; default for verbose checkout: clear the sticky tag so
+	   ;; that the actual update will get the head of the trunk
+	   (if (or (not rev) (string= rev ""))
+	       "-A"
+	     (concat "-r" rev))
+	   switches)))
+
+(defun vc-mcvs-rename-file (old new)
+  (vc-mcvs-command nil 0 new "move" (file-relative-name old)))
+
+(defun vc-mcvs-revert (file &optional contents-done)
+  "Revert FILE to the working revision it was based on."
+  (vc-default-revert 'MCVS file contents-done)
+  (unless (eq (vc-mcvs-checkout-model (list file)) 'implicit)
+    (if vc-mcvs-use-edit
+        (vc-mcvs-command nil 0 file "unedit")
+      ;; Make the file read-only by switching off all w-bits
+      (set-file-modes file (logand (file-modes file) 3950)))))
+
+(defun vc-mcvs-merge (file first-revision &optional second-revision)
+  "Merge changes into current working copy of FILE.
+The changes are between FIRST-REVISION and SECOND-REVISION."
+  (vc-mcvs-command nil 0 file
+		   "update" "-kk"
+		   (concat "-j" first-revision)
+		   (concat "-j" second-revision))
+  (vc-file-setprop file 'vc-state 'edited)
+  (with-current-buffer (get-buffer "*vc*")
+    (goto-char (point-min))
+    (if (re-search-forward "conflicts during merge" nil t)
+        1				; signal error
+      0)))				; signal success
+
+(defun vc-mcvs-merge-news (file)
+  "Merge in any new changes made to FILE."
+  (message "Merging changes into %s..." file)
+  ;; (vc-file-setprop file 'vc-working-revision nil)
+  (vc-file-setprop file 'vc-checkout-time 0)
+  (vc-mcvs-command nil 0 file "update")
+  ;; Analyze the merge result reported by Meta-CVS, and set
+  ;; file properties accordingly.
+  (with-current-buffer (get-buffer "*vc*")
+    (goto-char (point-min))
+    ;; get new working revision
+    (if (re-search-forward
+	 "^Merging differences between [0-9.]* and \\([0-9.]*\\) into" nil t)
+	(vc-file-setprop file 'vc-working-revision (match-string 1))
+      (vc-file-setprop file 'vc-working-revision nil))
+    ;; get file status
+    (prog1
+        (if (eq (buffer-size) 0)
+            0 ;; there were no news; indicate success
+          (if (re-search-forward
+               (concat "^\\([CMUP] \\)?"
+                       ".*"
+                       "\\( already contains the differences between \\)?")
+               nil t)
+              (cond
+               ;; Merge successful, we are in sync with repository now
+               ((or (match-string 2)
+                    (string= (match-string 1) "U ")
+                    (string= (match-string 1) "P "))
+                (vc-file-setprop file 'vc-state 'up-to-date)
+                (vc-file-setprop file 'vc-checkout-time
+                                 (nth 5 (file-attributes file)))
+                0);; indicate success to the caller
+               ;; Merge successful, but our own changes are still in the file
+               ((string= (match-string 1) "M ")
+                (vc-file-setprop file 'vc-state 'edited)
+                0);; indicate success to the caller
+               ;; Conflicts detected!
+               (t
+                (vc-file-setprop file 'vc-state 'edited)
+                1);; signal the error to the caller
+               )
+            (pop-to-buffer "*vc*")
+            (error "Couldn't analyze mcvs update result")))
+      (message "Merging changes into %s...done" file))))
+
+(defun vc-mcvs-modify-change-comment (files rev comment)
+  "Modify the change comments for FILES on a specified REV.
+Will fail unless you have administrative privileges on the repo."
+  (vc-mcvs-command nil 0 files "rcs" (concat "-m" comment ":" rev)))
+
+
+;;;
+;;; History functions
+;;;
+
+(defun vc-mcvs-print-log (files &optional buffer)
+  "Get change log associated with FILES."
+  (let ((default-directory (vc-mcvs-root (car files))))
+    ;; Run the command from the root dir so that `mcvs filt' returns
+    ;; valid relative names.
+    (vc-mcvs-command
+     buffer
+     (if (vc-stay-local-p files) 'async 0)
+     files "log")))
+
+(defun vc-mcvs-diff (files &optional oldvers newvers buffer)
+  "Get a difference report using Meta-CVS between two revisions of FILES."
+    (let* ((async (and (not vc-disable-async-diff)
+                       (vc-stay-local-p files)))
+	   ;; Run the command from the root dir so that `mcvs filt' returns
+	   ;; valid relative names.
+	   (default-directory (vc-mcvs-root (car files)))
+	   (status
+	    (apply 'vc-mcvs-command (or buffer "*vc-diff*")
+		   (if async 'async 1)
+		   files "diff"
+		   (and oldvers (concat "-r" oldvers))
+		   (and newvers (concat "-r" newvers))
+		   (vc-switches 'MCVS 'diff))))
+      (if async 1 status)))	       ; async diff, pessimistic assumption.
+
+(defun vc-mcvs-annotate-command (file buffer &optional revision)
+  "Execute \"mcvs annotate\" on FILE, inserting the contents in BUFFER.
+Optional arg REVISION is a revision to annotate from."
+  (vc-mcvs-command
+   buffer
+   (if (vc-stay-local-p file) 'async 0)
+   file "annotate" (if revision (concat "-r" revision)))
+  (with-current-buffer buffer
+    (goto-char (point-min))
+    (re-search-forward "^[0-9]")
+    (delete-region (point-min) (1- (point)))))
+
+(defalias 'vc-mcvs-annotate-current-time 'vc-cvs-annotate-current-time)
+(defalias 'vc-mcvs-annotate-time 'vc-cvs-annotate-time)
+
+;;;
+;;; Tag system
+;;;
+
+(defun vc-mcvs-create-tag (dir name branchp)
+  "Assign to DIR's current revision a given NAME.
+If BRANCHP is non-nil, the name is created as a branch (and the current
+workspace is immediately moved to that new branch)."
+  (if (not branchp)
+      (vc-mcvs-command nil 0 dir "tag" "-c" name)
+    (vc-mcvs-command nil 0 dir "branch" name)
+    (vc-mcvs-command nil 0 dir "switch" name)))
+
+(defun vc-mcvs-retrieve-tag (dir name update)
+  "Retrieve a tag at and below DIR.
+NAME is the name of the tag; if it is empty, do a `cvs update'.
+If UPDATE is non-nil, then update (resynch) any affected buffers."
+  (with-current-buffer (get-buffer-create "*vc*")
+    (let ((default-directory dir)
+	  (sticky-tag))
+      (erase-buffer)
+      (if (or (not name) (string= name ""))
+	  (vc-mcvs-command t 0 nil "update")
+	(vc-mcvs-command t 0 nil "update" "-r" name)
+	(setq sticky-tag name))
+      (when update
+	(goto-char (point-min))
+	(while (not (eobp))
+	  (if (looking-at "\\([CMUP]\\) \\(.*\\)")
+	      (let* ((file (expand-file-name (match-string 2) dir))
+		     (state (match-string 1))
+		     (buffer (find-buffer-visiting file)))
+		(when buffer
+		  (cond
+		   ((or (string= state "U")
+			(string= state "P"))
+		    (vc-file-setprop file 'vc-state 'up-to-date)
+		    (vc-file-setprop file 'vc-working-revision nil)
+		    (vc-file-setprop file 'vc-checkout-time
+				     (nth 5 (file-attributes file))))
+		   ((or (string= state "M")
+			(string= state "C"))
+		    (vc-file-setprop file 'vc-state 'edited)
+		    (vc-file-setprop file 'vc-working-revision nil)
+		    (vc-file-setprop file 'vc-checkout-time 0)))
+		  (vc-file-setprop file 'vc-mcvs-sticky-tag sticky-tag)
+		  (vc-resynch-buffer file t t))))
+	  (forward-line 1))))))
+
+
+;;;
+;;; Miscellaneous
+;;;
+
+(defalias 'vc-mcvs-make-version-backups-p 'vc-stay-local-p
+  "Return non-nil if version backups should be made for FILE.")
+(defalias 'vc-mcvs-check-headers 'vc-cvs-check-headers)
+
+
+;;;
+;;; Internal functions
+;;;
+
+(defun vc-mcvs-command (buffer okstatus file &rest flags)
+  "A wrapper around `vc-do-command' for use in vc-mcvs.el.
+The difference to vc-do-command is that this function always invokes `mcvs',
+and that it passes `vc-mcvs-global-switches' to it before FLAGS."
+  (let ((args (append '("--error-terminate")
+		      (if (stringp vc-mcvs-global-switches)
+			  (cons vc-mcvs-global-switches flags)
+			(append vc-mcvs-global-switches flags)))))
+    (if (not (member (car flags) '("diff" "log" "status")))
+	;; No need to filter: do it the easy way.
+	(apply 'vc-do-command (or buffer "*vc*") okstatus "mcvs" file args)
+      ;; We need to filter the output.
+      ;; The output of the filter uses filenames relative to the root,
+      ;; so we need to change the default-directory.
+      ;; (assert (equal default-directory (vc-mcvs-root file)))
+      (vc-do-command
+       (or buffer "*vc*") okstatus "sh" nil "-c"
+       (concat "mcvs "
+	       (mapconcat
+		'shell-quote-argument
+		(append (remq nil args)
+			(if file (list (file-relative-name file))))
+		" ")
+	       " | mcvs filt")))))
+
+(defun vc-mcvs-repository-hostname (dirname)
+  (vc-cvs-repository-hostname (vc-mcvs-root dirname)))
+
+(defun vc-mcvs-dir-state-heuristic (dir)
+  "Find the Meta-CVS state of all files in DIR, using only local information."
+  (with-temp-buffer
+    (vc-cvs-get-entries dir)
+    (goto-char (point-min))
+    (while (not (eobp))
+      ;; Meta-MCVS-removed files are not taken under VC control.
+      (when (looking-at "/\\([^/]*\\)/[^/-]")
+	(let ((file (expand-file-name (match-string 1) dir)))
+	  (unless (vc-file-getprop file 'vc-state)
+	    (vc-cvs-parse-entry file t))))
+      (forward-line 1))))
+
+(defalias 'vc-mcvs-valid-symbolic-tag-name-p 'vc-cvs-valid-symbolic-tag-name-p)
+(defalias 'vc-mcvs-valid-revision-number-p 'vc-cvs-valid-revision-number-p)
+
+(provide 'vc-mcvs)
+
+;; ********** READ THIS! **********
+;;
+;; This file apparently does not work with the new (as of Emacs 23)
+;; VC code.  Use at your own risk.  Please contact emacs-devel if you
+;; can maintain this file and update it to work correctly.
+;;
+;; ********** READ THIS! **********
+
+;; arch-tag: a39c7c1c-5247-429d-88df-dd7187d2e704
+;;; vc-mcvs.el ends here