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+;;; vc-hooks.el -- resident support for version-control
+
+;; Copyright (C) 1992 Free Software Foundation, Inc.
+
+;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
+;; Version: 4.0
+
+;;	$Id: vc-hooks.el,v 1.44 1992/07/31 06:43:05 esr Exp $	
+
+;; 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.
+
+;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; See the commentary of vc.el.
+
+;;; Code:
+
+(defvar vc-master-templates
+  '(("%sRCS/%s,v" . RCS) ("%s%s,v" . RCS) ("%sRCS/%s" . RCS)
+    ("%sSCCS/s.%s" . SCCS) ("%ss.%s". SCCS))
+  "*Where to look for version-control master files.
+The first pair corresponding to a given back end is used as a template
+when creating new masters.")
+
+(defvar vc-make-backup-files nil
+  "*If non-nil, backups of registered files are made according to
+the make-backup-files variable.  Otherwise, prevents backups being made.")
+
+;; Tell Emacs about this new kind of minor mode
+(if (not (assoc 'vc-mode-string minor-mode-alist))
+    (setq minor-mode-alist (cons '(vc-mode-string vc-mode-string)
+				 minor-mode-alist)))
+
+(make-variable-buffer-local 'vc-mode-string)
+
+;; We need a notion of per-file properties because the version
+;; control state of a file is expensive to derive --- we don't
+;; want to recompute it even on every find.
+
+(defvar vc-file-prop-obarray [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
+  "Obarray for per-file properties.")
+
+(defun vc-file-setprop (file property value)
+  ;; set per-file property
+  (put (intern file vc-file-prop-obarray) property value))
+
+(defun vc-file-getprop (file property)
+  ;; get per-file property
+  (get (intern file vc-file-prop-obarray) property))
+
+;;; actual version-control code starts here
+
+(defun vc-registered (file)
+  ;; Search for a master corresponding to the given file
+  (let ((dirname (or (file-name-directory file) ""))
+	(basename (file-name-nondirectory file)))
+    (catch 'found
+      (mapcar
+       (function (lambda (s)
+	  (let ((trial (format (car s) dirname basename)))
+	    (if (and (file-exists-p trial)
+		     ;; Make sure the file we found with name
+		     ;; TRIAL is not the source file itself.
+		     ;; That can happen with RCS-style names
+		     ;; if the file name is truncated
+		     ;; (e.g. to 14 chars).  See if either
+		     ;; directory or attributes differ.
+		     (or (not (string= dirname
+				       (file-name-directory trial)))
+			 (not (equal
+			       (file-attributes file)
+			       (file-attributes trial)))))
+		(throw 'found (cons trial (cdr s)))))))
+       vc-master-templates)
+      nil)
+    ))
+
+(defun vc-backend-deduce (file)
+  "Return the version-control type of a file, nil if it is not registered"
+  (and file
+       (or (vc-file-getprop file 'vc-backend)
+	   (vc-file-setprop file 'vc-backend (cdr (vc-registered file))))))
+
+(defun vc-toggle-read-only ()
+  "If the file in the current buffer id under version control, perform the
+logical next version-control action; otherwise, just toggle the buffer's
+read-only flag."
+  (interactive)
+  (if (vc-backend-deduce (buffer-file-name))
+      (vc-next-action nil)
+    (toggle-read-only)))
+
+(defun vc-mode-line (file &optional label)
+  "Set `vc-mode-string' to display type of version control for FILE.
+The value is set in the current buffer, which should be the buffer
+visiting FILE."
+  (let ((vc-type (vc-backend-deduce file)))
+    (if vc-type
+	(progn
+	  (if (null (current-local-map))
+	      (use-local-map (make-sparse-keymap)))
+	  (define-key (current-local-map) "\C-x\C-q" 'vc-toggle-read-only)
+	  (setq vc-mode-string
+		(concat " " (or label (symbol-name vc-type))))))
+    ;; force update of mode line
+    (set-buffer-modified-p (buffer-modified-p))
+    vc-type))
+
+;;; install a call to the above as a find-file hook
+(defun vc-find-file-hook ()
+  (if (and (vc-mode-line buffer-file-name) (not vc-make-backup-files))
+      (progn
+	(make-local-variable 'make-backup-files)
+	(setq make-backup-files nil))))
+
+(or (memq 'vc-find-file-hook find-file-hooks)
+    (setq find-file-hooks
+	  (cons 'vc-find-file-hook find-file-hooks)))
+
+;;; more hooks, this time for file-not-found
+(defun vc-file-not-found-hook ()
+  "When file is not found, try to check it out from RCS or SCCS.
+Returns t if checkout was successful, nil otherwise."
+  (if (vc-backend-deduce buffer-file-name)
+      (progn
+	(require 'vc)
+	(not (vc-error-occurred (vc-checkout buffer-file-name))))))
+
+(or (memq 'vc-file-not-found-hook find-file-not-found-hooks)
+    (setq find-file-not-found-hooks
+	  (cons 'vc-file-not-found-hook find-file-not-found-hooks)))
+
+;;; Now arrange for bindings and autoloading of the main package.
+;;; Bindings for this have to go in the global map, as it may have
+;;; to coexist with a lot of different major modes.
+
+(setq vc-prefix-map (lookup-key global-map "\C-xv"))
+(if (not (keymapp vc-prefix-map))
+    (progn
+      (setq vc-prefix-map (make-sparse-keymap))
+      (define-key global-map "\C-xv" vc-prefix-map)
+      (define-key vc-prefix-map "a" 'vc-update-change-log)
+      (define-key vc-prefix-map "c" 'vc-cancel-version)
+      (define-key vc-prefix-map "d" 'vc-diff)
+      (define-key vc-prefix-map "h" 'vc-insert-headers)
+      (define-key vc-prefix-map "i" 'vc-register)
+      (define-key vc-prefix-map "l" 'vc-print-log)
+      (define-key vc-prefix-map "r" 'vc-retrieve-snapshot)
+      (define-key vc-prefix-map "s" 'vc-create-snapshot)
+      (define-key vc-prefix-map "u" 'vc-revert-buffer)
+      (define-key vc-prefix-map "v" 'vc-next-action)
+      (define-key vc-prefix-map "=" 'vc-directory)
+      ))
+
+(autoload 'vc-update-change-log "vc.el" nil t)
+(autoload 'vc-cancel-version "vc.el" nil t)
+(autoload 'vc-diff "vc.el" nil t)
+(autoload 'vc-insert-headers "vc.el" nil t)
+(autoload 'vc-register "vc.el" nil t)
+(autoload 'vc-print-log "vc.el" nil t)
+(autoload 'vc-retrieve-snapshot "vc.el" nil t)
+(autoload 'vc-creat-snapshot "vc.el" nil t)
+(autoload 'vc-directory "vc.el" nil t)
+(autoload 'vc-revert-buffer "vc.el" nil t)
+(autoload 'vc-next-action "vc.el" nil t)
+
+(provide 'vc-hooks)
+
+;;; vc-hooks.el ends here