(Custom-set, Custom-save, Custom-reset-current)

[gnu-emacs] / lisp / vc-hooks.el

diff --git a/lisp/vc-hooks.el b/lisp/vc-hooks.el
index 9fbe79508a78000e7a928124f5d8f8a15bfbc7fd..5591d4908109fc1a9c8bbd91dacf05c2227ef035 100644 (file)
--- a/lisp/vc-hooks.el
+++ b/lisp/vc-hooks.el
@@ -1,11 +1,11 @@
 ;;; vc-hooks.el --- resident support for version-control
 
 ;;; vc-hooks.el --- resident support for version-control
 

-;; Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+;; Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998 Free Software Foundation, Inc.

 
 

-;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
-;; Modified by:
-;;   Per Cederqvist <ceder@lysator.liu.se>
-;;   Andre Spiegel <spiegel@berlin.informatik.uni-stuttgart.de>
+;; Author:     Eric S. Raymond <esr@snark.thyrsus.com>
+;; Maintainer: Andre Spiegel <spiegel@inf.fu-berlin.de>
+
+;; $Id: vc-hooks.el,v 1.1 2000/01/10 13:25:12 gerd Exp gerd $

 
 ;; This file is part of GNU Emacs.
 
 
 ;; This file is part of GNU Emacs.
 


@@ -35,38 +35,52 @@
 
 ;; Customization Variables (the rest is in vc.el)
 
 
 ;; Customization Variables (the rest is in vc.el)
 

-(defvar vc-default-back-end nil
+(defcustom vc-default-back-end nil

   "*Back-end actually used by this interface; may be SCCS or RCS.
   "*Back-end actually used by this interface; may be SCCS or RCS.

-The value is only computed when needed to avoid an expensive search.")
+The value is only computed when needed to avoid an expensive search."
+  :type '(choice (const nil) (const RCS) (const SCCS))
+  :group 'vc)

 
 

-(defvar vc-handle-cvs t
+(defcustom vc-handle-cvs t

   "*If non-nil, use VC for files managed with CVS.
   "*If non-nil, use VC for files managed with CVS.

-If it is nil, don't use VC for those files.")
+If it is nil, don't use VC for those files."
+  :type 'boolean
+  :group 'vc)

 
 

-(defvar vc-rcsdiff-knows-brief nil
+(defcustom vc-rcsdiff-knows-brief nil

   "*Indicates whether rcsdiff understands the --brief option.
 The value is either `yes', `no', or nil.  If it is nil, VC tries
   "*Indicates whether rcsdiff understands the --brief option.
 The value is either `yes', `no', or nil.  If it is nil, VC tries

-to use --brief and sets this variable to remember whether it worked.")
+to use --brief and sets this variable to remember whether it worked."
+  :type '(choice (const nil) (const yes) (const no))
+  :group 'vc)

 
 

-(defvar vc-path
+(defcustom vc-path

   (if (file-directory-p "/usr/sccs")
       '("/usr/sccs")
     nil)
   (if (file-directory-p "/usr/sccs")
       '("/usr/sccs")
     nil)

-  "*List of extra directories to search for version control commands.")
+  "*List of extra directories to search for version control commands."
+  :type '(repeat directory)
+  :group 'vc)

 
 

-(defvar vc-master-templates
+(defcustom vc-master-templates

   '(("%sRCS/%s,v" . RCS) ("%s%s,v" . RCS) ("%sRCS/%s" . RCS)
     ("%sSCCS/s.%s" . SCCS) ("%ss.%s". SCCS)
   '(("%sRCS/%s,v" . RCS) ("%s%s,v" . RCS) ("%sRCS/%s" . RCS)
     ("%sSCCS/s.%s" . SCCS) ("%ss.%s". SCCS)

-    vc-find-cvs-master)
+    vc-find-cvs-master
+    vc-search-sccs-project-dir)

   "*Where to look for version-control master files.
 The first pair corresponding to a given back end is used as a template
   "*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.")
+when creating new masters.
+Setting this variable to nil turns off use of VC entirely."
+  :type '(repeat sexp)
+  :group 'vc)

 
 

-(defvar vc-make-backup-files nil
+(defcustom vc-make-backup-files nil

   "*If non-nil, backups of registered files are made as with other files.
   "*If non-nil, backups of registered files are made as with other files.

-If nil (the default), files covered by version control don't get backups.")
+If nil (the default), files covered by version control don't get backups."
+  :type 'boolean
+  :group 'vc)

 
 

-(defvar vc-follow-symlinks 'ask
+(defcustom vc-follow-symlinks 'ask

   "*Indicates what to do if you visit a symbolic link to a file
 that is under version control.  Editing such a file through the
 link bypasses the version control system, which is dangerous and
   "*Indicates what to do if you visit a symbolic link to a file
 that is under version control.  Editing such a file through the
 link bypasses the version control system, which is dangerous and


@@ -74,24 +88,45 @@ probably not what you want.
   If this variable is t, VC follows the link and visits the real file,
 telling you about it in the echo area.  If it is `ask', VC asks for
 confirmation whether it should follow the link.  If nil, the link is
   If this variable is t, VC follows the link and visits the real file,
 telling you about it in the echo area.  If it is `ask', VC asks for
 confirmation whether it should follow the link.  If nil, the link is

-visited and a warning displayed.")
+visited and a warning displayed."
+  :type '(choice (const ask) (const nil) (const t))
+  :group 'vc)

 
 

-(defvar vc-display-status t
+(defcustom vc-display-status t

   "*If non-nil, display revision number and lock status in modeline.
   "*If non-nil, display revision number and lock status in modeline.

-Otherwise, not displayed.")
+Otherwise, not displayed."
+  :type 'boolean
+  :group 'vc)
+

 
 

-(defvar vc-consult-headers t
-  "*If non-nil, identify work files by searching for version headers.")
+(defcustom vc-consult-headers t
+  "*If non-nil, identify work files by searching for version headers."
+  :type 'boolean
+  :group 'vc)

 
 

-(defvar vc-keep-workfiles t
+(defcustom vc-keep-workfiles t

   "*If non-nil, don't delete working files after registering changes.
 If the back-end is CVS, workfiles are always kept, regardless of the
   "*If non-nil, don't delete working files after registering changes.
 If the back-end is CVS, workfiles are always kept, regardless of the

-value of this flag.")
+value of this flag."
+  :type 'boolean
+  :group 'vc)

 
 

-(defvar vc-mistrust-permissions nil
+(defcustom vc-mistrust-permissions nil

   "*If non-nil, don't assume that permissions and ownership track 
 version-control status.  If nil, do rely on the permissions.
   "*If non-nil, don't assume that permissions and ownership track 
 version-control status.  If nil, do rely on the permissions.

-See also variable `vc-consult-headers'.")
+See also variable `vc-consult-headers'."
+  :type 'boolean
+  :group 'vc)
+
+(defcustom vc-ignore-vc-files nil
+  "*If non-nil don't look for version control information when finding files.
+
+It may be useful to set this if (say) you edit files in a directory
+containing corresponding RCS files but don't have RCS available;
+similarly for other version control systems."
+  :type 'boolean
+  :group 'vc
+  :version "20.3")

 
 (defun vc-mistrust-permissions (file)
   ;; Access function to the above.
 
 (defun vc-mistrust-permissions (file)
   ;; Access function to the above.


@@ -159,7 +194,7 @@ See also variable `vc-consult-headers'.")
   ;; number of the subexpression that should be returned. If there's
   ;; a third element (also the number of a subexpression), that 
   ;; subexpression is assumed to be a date field and we want the most
   ;; number of the subexpression that should be returned. If there's
   ;; a third element (also the number of a subexpression), that 
   ;; subexpression is assumed to be a date field and we want the most

-  ;; recent entry matching the template.
+  ;; recent entry matching the template; this works for RCS format dates only.

   ;; If FILE and PROPERTIES are given, the latter must be a list of
   ;; properties of the same length as PATTERNS; each property is assigned 
   ;; the corresponding value.
   ;; If FILE and PROPERTIES are given, the latter must be a list of
   ;; properties of the same length as PATTERNS; each property is assigned 
   ;; the corresponding value.


@@ -178,6 +213,13 @@ See also variable `vc-consult-headers'.")
              (let ((latest-date "") (latest-val))
                (while (re-search-forward (car p) nil t)
                  (let ((date (vc-match-substring (elt p 2))))
              (let ((latest-date "") (latest-val))
                (while (re-search-forward (car p) nil t)
                  (let ((date (vc-match-substring (elt p 2))))

+                   ;; Most (but not all) versions of RCS use two-digit years
+                   ;; to represent dates in the range 1900 through 1999.
+                   ;; The two-digit and four-digit notations can both appear
+                   ;; in the same file.  Normalize the two-digit versions.
+                   (save-match-data
+                     (if (string-match "\\`[0-9][0-9]\\." date)
+                          (setq date (concat "19" date))))

                    (if (string< latest-date date)
                        (progn
                          (setq latest-date date)
                    (if (string< latest-date date)
                        (progn
                          (setq latest-date date)


@@ -272,6 +314,45 @@ See also variable `vc-consult-headers'.")
           (error "Couldn't find version control information")))
     exec-status))
 
           (error "Couldn't find version control information")))
     exec-status))
 

+(defun vc-parse-cvs-status (&optional full)
+  ;; Parse output of "cvs status" command in the current buffer and
+  ;; set file properties accordingly.  Unless FULL is t, parse only
+  ;; essential information.
+  (let (file status)
+    (goto-char (point-min))
+    (if (re-search-forward "^File: " nil t)
+        (cond 
+         ((looking-at "no file") nil)
+         ((re-search-forward "\\=\\([^ \t]+\\)" nil t)
+          (setq file (concat default-directory (match-string 1)))
+          (vc-file-setprop file 'vc-backend 'CVS)
+          (if (not (re-search-forward "\\=[ \t]+Status: \\(.*\\)" nil t))
+              (setq status "Unknown")
+            (setq status (match-string 1)))
+          (if (and full 
+                   (re-search-forward 
+  "\\(RCS Version\\|RCS Revision\\|Repository revision\\):[\t ]+\\([0-9.]+\\)"
+                    nil t))
+              (vc-file-setprop file 'vc-latest-version (match-string 2)))
+          (cond 
+           ((string-match "Up-to-date" status)
+            (vc-file-setprop file 'vc-cvs-status 'up-to-date)
+            (vc-file-setprop file 'vc-checkout-time 
+                             (nth 5 (file-attributes file))))
+           ((vc-file-setprop file 'vc-cvs-status
+             (cond 
+              ((string-match "Locally Modified"    status) 'locally-modified)
+              ((string-match "Needs Merge"         status) 'needs-merge)
+              ((string-match "Needs \\(Checkout\\|Patch\\)" status) 
+               'needs-checkout)
+              ((string-match "Unresolved Conflict" status) 
+              'unresolved-conflict)
+             ((string-match "File had conflicts on merge" status)
+              'unresolved-conflict)
+              ((string-match "Locally Added"       status) 'locally-added)
+              ((string-match "New file!"           status) 'locally-added)
+              (t 'unknown))))))))))
+

 (defun vc-fetch-master-properties (file)
   ;; Fetch those properties of FILE that are stored in the master file.
   ;; For an RCS file, we don't get vc-latest-version vc-your-latest-version
 (defun vc-fetch-master-properties (file)
   ;; Fetch those properties of FILE that are stored in the master file.
   ;; For an RCS file, we don't get vc-latest-version vc-your-latest-version


@@ -289,7 +370,7 @@ See also variable `vc-consult-headers'.")
       (vc-parse-buffer 
        (list '("^\001d D \\([^ ]+\\)" 1)
             (list (concat "^\001d D \\([^ ]+\\) .* " 
       (vc-parse-buffer 
        (list '("^\001d D \\([^ ]+\\)" 1)
             (list (concat "^\001d D \\([^ ]+\\) .* " 

-                          (regexp-quote (user-login-name)) " ") 1))
+                          (regexp-quote (vc-user-login-name)) " ") 1))

        file
        '(vc-latest-version vc-your-latest-version)))
 
        file
        '(vc-latest-version vc-your-latest-version)))
 


@@ -335,31 +416,7 @@ See also variable `vc-consult-headers'.")
         (let ((default-directory (file-name-directory file)))
           (vc-simple-command 0 "cvs" (file-name-nondirectory file) "status"))
        (set-buffer (get-buffer "*vc-info*"))
         (let ((default-directory (file-name-directory file)))
           (vc-simple-command 0 "cvs" (file-name-nondirectory file) "status"))
        (set-buffer (get-buffer "*vc-info*"))

-       (vc-parse-buffer     
-        ;; CVS 1.3 says "RCS Version:", other releases "RCS Revision:",
-        ;; and CVS 1.4a1 says "Repository revision:".
-        '(("\\(RCS Version\\|RCS Revision\\|Repository revision\\):[\t ]+\\([0-9.]+\\)" 2)
-          ("^File: [^ \t]+[ \t]+Status: \\(.*\\)" 1))
-        file
-        '(vc-latest-version vc-cvs-status))
-       ;; Translate those status values that we understand into symbols.
-       ;; Any other value is converted to nil.
-       (let ((status (vc-file-getprop file 'vc-cvs-status)))
-        (cond 
-         ((string-match "Up-to-date" status)
-          (vc-file-setprop file 'vc-cvs-status 'up-to-date)
-          (vc-file-setprop file 'vc-checkout-time 
-                           (nth 5 (file-attributes file))))
-         ((vc-file-setprop file 'vc-cvs-status
-           (cond 
-            ((string-match "Locally Modified"    status) 'locally-modified)
-            ((string-match "Needs Merge"         status) 'needs-merge)
-            ((string-match "Needs \\(Checkout\\|Patch\\)" status) 
-                                                          'needs-checkout)
-            ((string-match "Unresolved Conflict" status) 'unresolved-conflict)
-            ((string-match "Locally Added"       status) 'locally-added)
-            (t 'unknown)
-            ))))))))
+        (vc-parse-cvs-status t))))

     (if (get-buffer "*vc-info*")
        (kill-buffer (get-buffer "*vc-info*")))))
 
     (if (get-buffer "*vc-info*")
        (kill-buffer (get-buffer "*vc-info*")))))
 


@@ -386,14 +443,16 @@ See also variable `vc-consult-headers'.")
       (cond  
        ;; search for $Id or $Header
        ;; -------------------------
       (cond  
        ;; search for $Id or $Header
        ;; -------------------------

-       ((or (and (search-forward "$Id: " nil t)
+       ;; The `\ 's below avoid an RCS 5.7 bug when checking in this file.
+       ((or (and (search-forward "$Id\ : " nil t)

                 (looking-at "[^ ]+ \\([0-9.]+\\) "))
            (and (progn (goto-char (point-min))
                 (looking-at "[^ ]+ \\([0-9.]+\\) "))
            (and (progn (goto-char (point-min))

-                       (search-forward "$Header: " nil t))
+                       (search-forward "$Header\ : " nil t))

                 (looking-at "[^ ]+ \\([0-9.]+\\) ")))
        (goto-char (match-end 0))
        ;; if found, store the revision number ...
                 (looking-at "[^ ]+ \\([0-9.]+\\) ")))
        (goto-char (match-end 0))
        ;; if found, store the revision number ...

-       (setq version (buffer-substring (match-beginning 1) (match-end 1)))
+       (setq version (buffer-substring-no-properties (match-beginning 1)
+                                                     (match-end 1)))

        ;; ... and check for the locking state
        (cond 
         ((looking-at
        ;; ... and check for the locking state
        (cond 
         ((looking-at


@@ -409,7 +468,8 @@ See also variable `vc-consult-headers'.")
           ;; revision is locked by some user
           ((looking-at "\\([^ ]+\\) \\$")
            (setq locking-user
           ;; revision is locked by some user
           ((looking-at "\\([^ ]+\\) \\$")
            (setq locking-user

-                 (buffer-substring (match-beginning 1) (match-end 1)))
+                 (buffer-substring-no-properties (match-beginning 1)
+                                                 (match-end 1)))

            (setq status 'rev-and-lock))
           ;; everything else: false
           (nil)))
            (setq status 'rev-and-lock))
           ;; everything else: false
           (nil)))


@@ -422,13 +482,15 @@ See also variable `vc-consult-headers'.")
                                   "Revision: \\([0-9.]+\\) \\$")
                           nil t)
        ;; if found, store the revision number ...
                                   "Revision: \\([0-9.]+\\) \\$")
                           nil t)
        ;; if found, store the revision number ...

-       (setq version (buffer-substring (match-beginning 1) (match-end 1)))
+       (setq version (buffer-substring-no-properties (match-beginning 1)
+                                                     (match-end 1)))

        ;; and see if there's any lock information
        (goto-char (point-min))
        (if (re-search-forward (concat "\\$" "Locker:") nil t)
            (cond ((looking-at " \\([^ ]+\\) \\$")
        ;; and see if there's any lock information
        (goto-char (point-min))
        (if (re-search-forward (concat "\\$" "Locker:") nil t)
            (cond ((looking-at " \\([^ ]+\\) \\$")

-                  (setq locking-user (buffer-substring (match-beginning 1)
-                                                       (match-end 1)))
+                  (setq locking-user (buffer-substring-no-properties
+                                      (match-beginning 1)
+                                      (match-end 1)))

                   (setq status 'rev-and-lock))
                  ((looking-at " *\\$") 
                   (setq locking-user 'none)
                   (setq status 'rev-and-lock))
                  ((looking-at " *\\$") 
                   (setq locking-user 'none)


@@ -479,21 +541,26 @@ See also variable `vc-consult-headers'.")
   "Return the master name of a file, nil if it is not registered.
 For CVS, the full name of CVS/Entries is returned."
   (or (vc-file-getprop file 'vc-name)
   "Return the master name of a file, nil if it is not registered.
 For CVS, the full name of CVS/Entries is returned."
   (or (vc-file-getprop file 'vc-name)

-      (let ((name-and-type (vc-registered file)))
-       (if name-and-type
-           (progn
-             (vc-file-setprop file 'vc-backend (cdr name-and-type))
-             (vc-file-setprop file 'vc-name (car name-and-type)))))))
+      ;; Use the caching mechanism of vc-backend, below.
+      (if (vc-backend file)
+         (vc-file-getprop file 'vc-name))))

 
 (defun vc-backend (file)
   "Return the version-control type of a file, nil if it is not registered."
 
 (defun vc-backend (file)
   "Return the version-control type of a file, nil if it is not registered."

-  (and file
-       (or (vc-file-getprop file 'vc-backend)
-          (let ((name-and-type (vc-registered file)))
-            (if name-and-type
-                (progn
-                  (vc-file-setprop file 'vc-name (car name-and-type))
-                  (vc-file-setprop file 'vc-backend (cdr name-and-type))))))))
+  ;; Note that internally, Emacs remembers unregistered 
+  ;; files by setting the property to `none'.
+  (if file
+      (let ((property (vc-file-getprop file 'vc-backend))
+           (name-and-type))
+       (cond ((eq property 'none) nil)
+             (property)
+             (t (setq name-and-type (vc-registered file))
+                (if name-and-type
+                    (progn
+                      (vc-file-setprop file 'vc-name (car name-and-type))
+                      (vc-file-setprop file 'vc-backend (cdr name-and-type)))
+                  (vc-file-setprop file 'vc-backend 'none)
+                  nil))))))

 
 (defun vc-checkout-model (file)
   ;; Return `manual' if the user has to type C-x C-q to check out FILE.
 
 (defun vc-checkout-model (file)
   ;; Return `manual' if the user has to type C-x C-q to check out FILE.


@@ -510,7 +577,16 @@ For CVS, the full name of CVS/Entries is returned."
                (vc-file-getprop file 'vc-checkout-model))))
     ((eq (vc-backend file) 'CVS)
      (vc-file-setprop file 'vc-checkout-model
                (vc-file-getprop file 'vc-checkout-model))))
     ((eq (vc-backend file) 'CVS)
      (vc-file-setprop file 'vc-checkout-model

-                     (if (getenv "CVSREAD") 'manual 'implicit))))))
+      (cond
+       ((getenv "CVSREAD") 'manual)
+       ;; If the file is not writeable, this is probably because the
+       ;; file is being "watched" by other developers.  Use "manual"
+       ;; checkout in this case.  (If vc-mistrust-permissions was t,
+       ;; we actually shouldn't trust this, but there is no other way
+       ;; to learn this from CVS at the moment (version 1.9).)
+       ((string-match "r-..-..-." (nth 8 (file-attributes file)))
+        'manual)
+       (t 'implicit)))))))

 
 ;;; properties indicating the locking state
 
 
 ;;; properties indicating the locking state
 


@@ -560,24 +636,22 @@ For CVS, the full name of CVS/Entries is returned."
               (vc-file-setprop file 'vc-locking-user 'none))
              ((and (= (nth 2 attributes) (user-uid))
                    (string-match ".rw..-..-." (nth 8 attributes)))
               (vc-file-setprop file 'vc-locking-user 'none))
              ((and (= (nth 2 attributes) (user-uid))
                    (string-match ".rw..-..-." (nth 8 attributes)))

-              (vc-file-setprop file 'vc-locking-user (user-login-name)))
+              (vc-file-setprop file 'vc-locking-user (vc-user-login-name)))

              (nil)))))
 
              (nil)))))
 

+(defun vc-user-login-name (&optional uid)
+  ;; Return the name under which the user is logged in, as a string.
+  ;; (With optional argument UID, return the name of that user.)
+  ;; This function does the same as `user-login-name', but unlike
+  ;; that, it never returns nil.  If a UID cannot be resolved, that
+  ;; UID is returned as a string.
+  (or (user-login-name uid)
+      (and uid (number-to-string uid))
+      (number-to-string (user-uid))))
+

 (defun vc-file-owner (file)
 (defun vc-file-owner (file)

-  ;; The expression below should return the username of the owner
-  ;; of the file.  It doesn't.  It returns the username if it is
-  ;; you, or otherwise the UID of the owner of the file.  The
-  ;; return value from this function is only used by
-  ;; vc-dired-reformat-line, and it does the proper thing if a UID
-  ;; is returned.
-  ;; The *proper* way to fix this would be to implement a built-in
-  ;; function in Emacs, say, (username UID), that returns the
-  ;; username of a given UID.
-  ;; The result of this hack is that vc-directory will print the
-  ;; name of the owner of the file for any files that are
-  ;; modified.
-  (let ((uid (nth 2 (file-attributes file))))
-    (if (= uid (user-uid)) (user-login-name) uid)))
+  ;; Return who owns FILE (user name, as a string).
+  (vc-user-login-name (nth 2 (file-attributes file))))

 
 (defun vc-rcs-lock-from-diff (file)
   ;; Diff the file against the master version.  If differences are found,
 
 (defun vc-rcs-lock-from-diff (file)
   ;; Diff the file against the master version.  If differences are found,


@@ -600,8 +674,7 @@ For CVS, the full name of CVS/Entries is returned."
 
 (defun vc-locking-user (file)
   ;; Return the name of the person currently holding a lock on FILE.
 
 (defun vc-locking-user (file)
   ;; Return the name of the person currently holding a lock on FILE.

-  ;; Return nil if there is no such person.  (Sometimes, not the name
-  ;; of the locking user but his uid will be returned.)
+  ;; Return nil if there is no such person.

   ;;   Under CVS, a file is considered locked if it has been modified since
   ;; it was checked out.
   ;;   The property is cached.  It is only looked up if it is currently nil.
   ;;   Under CVS, a file is considered locked if it has been modified since
   ;; it was checked out.
   ;;   The property is cached.  It is only looked up if it is currently nil.


@@ -621,10 +694,7 @@ For CVS, the full name of CVS/Entries is returned."
            (and (equal (vc-file-getprop file 'vc-checkout-time)
                        (nth 5 (file-attributes file)))
                 (vc-file-setprop file 'vc-locking-user 'none))
            (and (equal (vc-file-getprop file 'vc-checkout-time)
                        (nth 5 (file-attributes file)))
                 (vc-file-setprop file 'vc-locking-user 'none))

-           (let ((locker (vc-file-owner file)))
-             (vc-file-setprop file 'vc-locking-user
-                              (if (stringp locker) locker
-                                (format "%d" locker))))))
+           (vc-file-setprop file 'vc-locking-user (vc-file-owner file))))

 
        ((eq (vc-backend file) 'RCS)
        (let (p-lock)
 
        ((eq (vc-backend file) 'RCS)
        (let (p-lock)


@@ -698,7 +768,7 @@ For CVS, the full name of CVS/Entries is returned."
             (list (concat "^\\([0-9]+\\.[0-9.]+\\)\n"
                           "date[ \t]+\\([0-9.]+\\);[ \t]+"
                           "author[ \t]+"
             (list (concat "^\\([0-9]+\\.[0-9.]+\\)\n"
                           "date[ \t]+\\([0-9.]+\\);[ \t]+"
                           "author[ \t]+"

-                          (regexp-quote (user-login-name)) ";") 1 2))
+                          (regexp-quote (vc-user-login-name)) ";") 1 2))

        file
        '(vc-latest-version vc-your-latest-version))
       (if (get-buffer "*vc-info*")
        file
        '(vc-latest-version vc-your-latest-version))
       (if (get-buffer "*vc-info*")


@@ -764,23 +834,50 @@ For CVS, the full name of CVS/Entries is returned."
           vc-master-templates)
          nil)))))
 
           vc-master-templates)
          nil)))))
 

-(defun vc-utc-string (timeval)
-  ;; Convert a time value into universal time, and return it as a
-  ;; human-readable string.  This is for comparing CVS checkout times
-  ;; with file modification times.
-  (let (utc (high (car timeval)) (low  (nth 1 timeval))
-        (offset (car (current-time-zone timeval))))
-    (setq low (- low offset))
-    (setq utc (if (> low 65535) 
-                 (list (1+ high) (- low 65536))
-               (if (< low 0)
-                   (list (1- high) (+ 65536 low))
-                 (list high low))))
-    (current-time-string utc)))
-         
+(defun vc-sccs-project-dir () 
+  ;; Return the full pathname of the SCCS PROJECTDIR, if it exists,
+  ;; otherwise nil.  The PROJECTDIR is indicated by the environment
+  ;; variable of the same name.  If its value starts with a slash,
+  ;; it must be an absolute path name that points to the 
+  ;; directory where SCCS history files reside.  If it does not
+  ;; begin with a slash, it is taken as the name of a user,
+  ;; and history files reside in an "src" or "source" subdirectory
+  ;; of that user's home directory.
+  (let ((project-dir (getenv "PROJECTDIR")))
+    (and project-dir
+         (if (eq (elt project-dir 0) ?/)
+             (if (file-exists-p (concat project-dir "/SCCS"))
+                 (concat project-dir "/SCCS/")
+               (if (file-exists-p project-dir)
+                   project-dir))
+           (setq project-dir (expand-file-name (concat "~" project-dir)))
+           (let (trial)
+             (setq trial (concat project-dir "/src/SCCS"))
+             (if (file-exists-p trial)
+                 (concat trial "/")
+               (setq trial (concat project-dir "/src"))
+               (if (file-exists-p trial)
+                   (concat trial "/")
+                 (setq trial (concat project-dir "/source/SCCS"))
+                 (if (file-exists-p trial)
+                     (concat trial "/")
+                   (setq trial (concat project-dir "/source/"))
+                   (if (file-exists-p trial)
+                       (concat trial "/"))))))))))
+
+(defun vc-search-sccs-project-dir (dirname basename)
+  ;; Check if there is a master file for BASENAME in the 
+  ;; SCCS project directory.  If yes, throw `found' as
+  ;; expected by vc-registered.  If not, return nil.
+  (let* ((project-dir (vc-sccs-project-dir))
+         (master-file (and project-dir (concat project-dir "s." basename))))
+    (and master-file
+         (file-exists-p master-file)
+         (throw 'found (cons master-file 'SCCS)))))
+

 (defun vc-find-cvs-master (dirname basename)
   ;; Check if DIRNAME/BASENAME is handled by CVS.
 (defun vc-find-cvs-master (dirname basename)
   ;; Check if DIRNAME/BASENAME is handled by CVS.

-  ;; If it is, do a (throw 'found (cons MASTER 'CVS)).
+  ;; If it is, do a (throw 'found (cons MASTER-FILE 'CVS)).

   ;; Note: This function throws the name of CVS/Entries
   ;; NOT that of the RCS master file (because we wouldn't be able
   ;; to access it under remote CVS).
   ;; Note: This function throws the name of CVS/Entries
   ;; NOT that of the RCS master file (because we wouldn't be able
   ;; to access it under remote CVS).


@@ -788,22 +885,38 @@ For CVS, the full name of CVS/Entries is returned."
   (if (and vc-handle-cvs
           (file-directory-p (concat dirname "CVS/"))
           (file-readable-p (concat dirname "CVS/Entries")))
   (if (and vc-handle-cvs
           (file-directory-p (concat dirname "CVS/"))
           (file-readable-p (concat dirname "CVS/Entries")))

-      (let (buffer time (fold case-fold-search)
-           (file (concat dirname basename)))
+      (let ((file (concat dirname basename))
+            buffer)

        (unwind-protect
            (save-excursion
              (setq buffer (set-buffer (get-buffer-create "*vc-info*")))
              (vc-insert-file (concat dirname "CVS/Entries"))
              (goto-char (point-min))
        (unwind-protect
            (save-excursion
              (setq buffer (set-buffer (get-buffer-create "*vc-info*")))
              (vc-insert-file (concat dirname "CVS/Entries"))
              (goto-char (point-min))

-             ;; make sure the file name is searched 
-             ;; case-sensitively
+             ;; make sure that the file name is searched 
+             ;; case-sensitively - case-fold-search is a buffer-local
+             ;; variable, so setting it here won't affect any other buffers

              (setq case-fold-search nil)
              (cond
              (setq case-fold-search nil)
              (cond

+              ;; entry for a "locally added" file (not yet committed)
+              ((re-search-forward
+                (concat "^/" (regexp-quote basename) "/0/") nil t)
+               (vc-file-setprop file 'vc-checkout-time 0)
+               (vc-file-setprop file 'vc-workfile-version "0")
+               (throw 'found (cons (concat dirname "CVS/Entries") 'CVS)))
+              ;; normal entry

               ((re-search-forward
                 (concat "^/" (regexp-quote basename) 
               ((re-search-forward
                 (concat "^/" (regexp-quote basename) 

-                        "/\\([^/]*\\)/\\([^/]*\\)/")
+                         ;; revision
+                         "/\\([^/]*\\)" 
+                         ;; timestamp
+                         "/[A-Z][a-z][a-z]"       ;; week day (irrelevant)
+                         " \\([A-Z][a-z][a-z]\\)" ;; month name
+                         " *\\([0-9]*\\)"         ;; day of month
+                         " \\([0-9]*\\):\\([0-9]*\\):\\([0-9]*\\)"  ;; hms
+                         " \\([0-9]*\\)"          ;; year
+                         ;; optional conflict field
+                         "\\(+[^/]*\\)?/")

                 nil t)
                 nil t)

-               (setq case-fold-search fold)  ;; restore the old value

                ;; We found it.  Store away version number now that we 
                ;; are anyhow so close to finding it.
                (vc-file-setprop file
                ;; We found it.  Store away version number now that we 
                ;; are anyhow so close to finding it.
                (vc-file-setprop file


@@ -811,13 +924,40 @@ For CVS, the full name of CVS/Entries is returned."
                                 (match-string 1))
                ;; If the file hasn't been modified since checkout,
                ;; store the checkout-time.
                                 (match-string 1))
                ;; If the file hasn't been modified since checkout,
                ;; store the checkout-time.

-               (let ((mtime (nth 5 (file-attributes file))))
-                 (if (string= (match-string 2) (vc-utc-string mtime))
+               (let ((mtime (nth 5 (file-attributes file)))
+                     (second (string-to-number (match-string 6)))
+                     (minute (string-to-number (match-string 5)))
+                     (hour (string-to-number (match-string 4)))
+                     (day (string-to-number (match-string 3)))
+                     (year (string-to-number (match-string 7))))
+                 (if (equal mtime
+                            (encode-time
+                             second minute hour day
+                             (/ (string-match
+                                 (match-string 2)
+                                 "xxxJanFebMarAprMayJunJulAugSepOctNovDec")
+                                3)
+                             year 0))

                      (vc-file-setprop file 'vc-checkout-time mtime)
                    (vc-file-setprop file 'vc-checkout-time 0)))
                (throw 'found (cons (concat dirname "CVS/Entries") 'CVS)))
                      (vc-file-setprop file 'vc-checkout-time mtime)
                    (vc-file-setprop file 'vc-checkout-time 0)))
                (throw 'found (cons (concat dirname "CVS/Entries") 'CVS)))

-              (t (setq case-fold-search fold)  ;; restore the old value
-                 nil)))
+               ;; entry with arbitrary text as timestamp
+               ;; (this means we should consider it modified)
+              ((re-search-forward
+                (concat "^/" (regexp-quote basename) 
+                         ;; revision
+                         "/\\([^/]*\\)" 
+                         ;; timestamp (arbitrary text)
+                         "/[^/]*"
+                         ;; optional conflict field
+                         "\\(+[^/]*\\)?/")
+                nil t)
+               ;; We found it.  Store away version number now that we 
+               ;; are anyhow so close to finding it.
+               (vc-file-setprop file 'vc-workfile-version (match-string 1))
+               (vc-file-setprop file 'vc-checkout-time 0)
+               (throw 'found (cons (concat dirname "CVS/Entries") 'CVS)))
+              (t nil)))

          (kill-buffer buffer)))))
 
 (defun vc-buffer-backend ()
          (kill-buffer buffer)))))
 
 (defun vc-buffer-backend ()


@@ -830,9 +970,14 @@ For CVS, the full name of CVS/Entries is returned."
   "Change read-only status of current buffer, perhaps via version control.
 If the buffer is visiting a file registered with version control,
 then check the file in or out.  Otherwise, just change the read-only flag
   "Change read-only status of current buffer, perhaps via version control.
 If the buffer is visiting a file registered with version control,
 then check the file in or out.  Otherwise, just change the read-only flag

-of the buffer.  With prefix argument, ask for version number."
+of the buffer.
+With prefix argument, ask for version number to check in or check out.
+Check-out of a specified version number does not lock the file;
+to do that, use this command a second time with no argument."

   (interactive "P")
   (interactive "P")

-  (if (vc-backend (buffer-file-name))
+  (if (or (and (boundp 'vc-dired-mode) vc-dired-mode)
+          ;; use boundp because vc.el might not be loaded
+          (vc-backend (buffer-file-name)))

       (vc-next-action verbose)
     (toggle-read-only)))
 (define-key global-map "\C-x\C-q" 'vc-toggle-read-only)
       (vc-next-action verbose)
     (toggle-read-only)))
 (define-key global-map "\C-x\C-q" 'vc-toggle-read-only)


@@ -843,13 +988,7 @@ of the buffer.  With prefix argument, ask for version number."
   ;; not locked, and the checkout model for it is `implicit',
   ;; mark it "locked" and redisplay the mode line.
   (let ((file (buffer-file-name)))
   ;; not locked, and the checkout model for it is `implicit',
   ;; mark it "locked" and redisplay the mode line.
   (let ((file (buffer-file-name)))

-    (and (vc-file-getprop file 'vc-backend)
-        ;; ...check the property directly, not through the function of the
-        ;; same name.  Otherwise Emacs would check for a master file
-        ;; each time a non-version-controlled buffer is saved.
-        ;; The property is computed when the file is visited, so if it
-        ;; is `nil' now, it is certain that the file is NOT 
-        ;; version-controlled.
+    (and (vc-backend file)

         (or (and (equal (vc-file-getprop file 'vc-checkout-time)
                         (nth 5 (file-attributes file)))
                  ;; File has been saved in the same second in which
         (or (and (equal (vc-file-getprop file 'vc-checkout-time)
                         (nth 5 (file-attributes file)))
                  ;; File has been saved in the same second in which


@@ -859,7 +998,7 @@ of the buffer.  With prefix argument, ask for version number."
             t)
         (not (vc-locking-user file))
         (eq (vc-checkout-model file) 'implicit)
             t)
         (not (vc-locking-user file))
         (eq (vc-checkout-model file) 'implicit)

-        (vc-file-setprop file 'vc-locking-user (user-login-name))
+        (vc-file-setprop file 'vc-locking-user (vc-user-login-name))

         (or (and (eq (vc-backend file) 'CVS) 
                  (vc-file-setprop file 'vc-cvs-status nil))
             t)
         (or (and (eq (vc-backend file) 'CVS) 
                  (vc-file-setprop file 'vc-cvs-status nil))
             t)


@@ -876,13 +1015,23 @@ control system name."
          (and vc-type
               (concat " " (or label (symbol-name vc-type)) 
                       (and vc-display-status (vc-status file)))))
          (and vc-type
               (concat " " (or label (symbol-name vc-type)) 
                       (and vc-display-status (vc-status file)))))

+    ;; If the file is locked by some other user, make
+    ;; the buffer read-only.  Like this, even root
+    ;; cannot modify a file that someone else has locked.

     (and vc-type 
         (equal file (buffer-file-name))
         (vc-locking-user file)
     (and vc-type 
         (equal file (buffer-file-name))
         (vc-locking-user file)

-        ;; If the file is locked by some other user, make
-        ;; the buffer read-only.  Like this, even root
-        ;; cannot modify a file without locking it first.
-        (not (string= (user-login-name) (vc-locking-user file)))
+        (not (string= (vc-user-login-name) (vc-locking-user file)))
+        (setq buffer-read-only t))
+    ;; If the user is root, and the file is not owner-writable,
+    ;; then pretend that we can't write it
+    ;; even though we can (because root can write anything).
+    ;; This way, even root cannot modify a file that isn't locked.
+    (and vc-type
+        (equal file (buffer-file-name))
+        (not buffer-read-only)
+        (zerop (user-real-uid))
+        (zerop (logand (file-modes (buffer-file-name)) 128))

         (setq buffer-read-only t))
     (force-mode-line-update)
     ;;(set-buffer-modified-p (buffer-modified-p)) ;;use this if Emacs 18
         (setq buffer-read-only t))
     (force-mode-line-update)
     ;;(set-buffer-modified-p (buffer-modified-p)) ;;use this if Emacs 18


@@ -910,19 +1059,35 @@ control system name."
           " @@")
          ((not locker)
           (concat "-" rev))
           " @@")
          ((not locker)
           (concat "-" rev))

-         ((if (stringp locker)
-              (string= locker (user-login-name))
-            (= locker (user-uid)))
+         ((string= locker (vc-user-login-name))

           (concat ":" rev))
          (t 
           (concat ":" locker ":" rev)))))
 
           (concat ":" rev))
          (t 
           (concat ":" locker ":" rev)))))
 

+(defun vc-follow-link ()
+  ;; If the current buffer visits a symbolic link, this function makes it
+  ;; visit the real file instead.  If the real file is already visited in 
+  ;; another buffer, make that buffer current, and kill the buffer 
+  ;; that visits the link.
+  (let* ((truename (abbreviate-file-name (file-chase-links buffer-file-name)))
+         (true-buffer (find-buffer-visiting truename))
+        (this-buffer (current-buffer)))
+    (if (eq true-buffer this-buffer)
+       (progn
+         (kill-buffer this-buffer)
+         ;; In principle, we could do something like set-visited-file-name.
+         ;; However, it can't be exactly the same as set-visited-file-name.
+         ;; I'm not going to work out the details right now. -- rms.
+         (set-buffer (find-file-noselect truename)))
+      (set-buffer true-buffer)
+      (kill-buffer this-buffer))))
+

 ;;; install a call to the above as a find-file hook
 (defun vc-find-file-hook ()
   ;; Recompute whether file is version controlled,
   ;; if user has killed the buffer and revisited.
   (cond 
 ;;; install a call to the above as a find-file hook
 (defun vc-find-file-hook ()
   ;; Recompute whether file is version controlled,
   ;; if user has killed the buffer and revisited.
   (cond 

-   (buffer-file-name
+   ((and (not vc-ignore-vc-files) buffer-file-name)

     (vc-file-clearprops buffer-file-name)
     (cond
      ((vc-backend buffer-file-name)
     (vc-file-clearprops buffer-file-name)
     (cond
      ((vc-backend buffer-file-name)


@@ -933,24 +1098,31 @@ control system name."
             (make-local-variable 'backup-inhibited)
             (setq backup-inhibited t))))
      ((let* ((link (file-symlink-p buffer-file-name))
             (make-local-variable 'backup-inhibited)
             (setq backup-inhibited t))))
      ((let* ((link (file-symlink-p buffer-file-name))

-            (link-type (and link (vc-backend link))))
+            (link-type (and link (vc-backend (file-chase-links link)))))

        (if link-type
             (cond ((eq vc-follow-symlinks nil)
                    (message
         "Warning: symbolic link to %s-controlled source file" link-type))
        (if link-type
             (cond ((eq vc-follow-symlinks nil)
                    (message
         "Warning: symbolic link to %s-controlled source file" link-type))

-                  ((eq vc-follow-symlinks 'ask)
+                  ((or (not (eq vc-follow-symlinks 'ask))
+                      ;; If we already visited this file by following
+                      ;; the link, don't ask again if we try to visit
+                      ;; it again.  GUD does that, and repeated questions
+                      ;; are painful.
+                      (get-file-buffer
+                       (abbreviate-file-name (file-chase-links buffer-file-name))))
+                      
+                  (vc-follow-link)
+                  (message "Followed link to %s" buffer-file-name)
+                  (vc-find-file-hook))
+                  (t

                    (if (yes-or-no-p (format
         "Symbolic link to %s-controlled source file; follow link? " link-type))
                    (if (yes-or-no-p (format
         "Symbolic link to %s-controlled source file; follow link? " link-type))

-                       (progn (setq buffer-file-name 
-                                    (file-truename buffer-file-name))
+                       (progn (vc-follow-link)

                               (message "Followed link to %s" buffer-file-name)
                               (vc-find-file-hook))
                      (message 
         "Warning: editing through the link bypasses version control")
                               (message "Followed link to %s" buffer-file-name)
                               (vc-find-file-hook))
                      (message 
         "Warning: editing through the link bypasses version control")

-                     ))
-                  (t (setq buffer-file-name (file-truename buffer-file-name))
-                     (message "Followed link to %s" buffer-file-name)
-                     (vc-find-file-hook))))))))))
+                     ))))))))))

 
 (add-hook 'find-file-hooks 'vc-find-file-hook)
 
 
 (add-hook 'find-file-hooks 'vc-find-file-hook)
 


@@ -958,7 +1130,11 @@ control system name."
 (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."
 (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 buffer-file-name)
+  ;; When a file does not exist, ignore cached info about it
+  ;; from a previous visit.
+  (vc-file-clearprops buffer-file-name)
+  (if (and (not vc-ignore-vc-files) 
+           (vc-backend buffer-file-name))

       (save-excursion
        (require 'vc)
        (setq default-directory (file-name-directory (buffer-file-name)))
       (save-excursion
        (require 'vc)
        (setq default-directory (file-name-directory (buffer-file-name)))


@@ -987,9 +1163,11 @@ Returns t if checkout was successful, nil otherwise."
       (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-directory)
       (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-directory)

+      (define-key vc-prefix-map "g" 'vc-annotate)

       (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 "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 "m" 'vc-merge)

       (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 "r" 'vc-retrieve-snapshot)
       (define-key vc-prefix-map "s" 'vc-create-snapshot)
       (define-key vc-prefix-map "u" 'vc-revert-buffer)


@@ -1003,8 +1181,13 @@ Returns t if checkout was successful, nil otherwise."
     ()
   ;;(define-key vc-menu-map [show-files]
   ;;  '("Show Files under VC" . (vc-directory t)))
     ()
   ;;(define-key vc-menu-map [show-files]
   ;;  '("Show Files under VC" . (vc-directory t)))

-  (define-key vc-menu-map [vc-directory] '("Show Locked Files" . vc-directory))
+  (define-key vc-menu-map [vc-retrieve-snapshot]
+    '("Retrieve Snapshot" . vc-retrieve-snapshot))
+  (define-key vc-menu-map [vc-create-snapshot]
+    '("Create Snapshot" . vc-create-snapshot))
+  (define-key vc-menu-map [vc-directory] '("VC Directory Listing" . vc-directory))

   (define-key vc-menu-map [separator1] '("----"))
   (define-key vc-menu-map [separator1] '("----"))

+  (define-key vc-menu-map [vc-annotate] '("Annotate" . vc-annotate))

   (define-key vc-menu-map [vc-rename-file] '("Rename File" . vc-rename-file))
   (define-key vc-menu-map [vc-version-other-window]
     '("Show Other Version" . vc-version-other-window))
   (define-key vc-menu-map [vc-rename-file] '("Rename File" . vc-rename-file))
   (define-key vc-menu-map [vc-version-other-window]
     '("Show Other Version" . vc-version-other-window))


@@ -1018,22 +1201,25 @@ Returns t if checkout was successful, nil otherwise."
     '("Revert to Last Version" . vc-revert-buffer))
   (define-key vc-menu-map [vc-insert-header]
     '("Insert Header" . vc-insert-headers))
     '("Revert to Last Version" . vc-revert-buffer))
   (define-key vc-menu-map [vc-insert-header]
     '("Insert Header" . vc-insert-headers))

-  (define-key vc-menu-map [vc-menu-check-in] '("Check In" . vc-next-action))
-  (define-key vc-menu-map [vc-check-out] '("Check Out" . vc-toggle-read-only))
-  (define-key vc-menu-map [vc-register] '("Register" . vc-register))
-  (put 'vc-rename-file 'menu-enable 'vc-mode)
-  (put 'vc-version-other-window 'menu-enable 'vc-mode)
-  (put 'vc-diff 'menu-enable 'vc-mode)
-  (put 'vc-update-change-log 'menu-enable
-       '(eq (vc-buffer-backend) 'RCS))
-  (put 'vc-print-log 'menu-enable 'vc-mode)
-  (put 'vc-cancel-version 'menu-enable 'vc-mode)
-  (put 'vc-revert-buffer 'menu-enable 'vc-mode)
-  (put 'vc-insert-headers 'menu-enable 'vc-mode)
-  (put 'vc-next-action 'menu-enable '(and vc-mode (not buffer-read-only)))
-  (put 'vc-toggle-read-only 'menu-enable '(and vc-mode buffer-read-only))
-  (put 'vc-register 'menu-enable '(and buffer-file-name (not vc-mode)))
-  )
+  (define-key vc-menu-map [vc-next-action] '("Check In/Out" . vc-next-action))
+  (define-key vc-menu-map [vc-register] '("Register" . vc-register)))
+
+;;; These are not correct and it's not currently clear how doing it
+;;; better (with more complicated expressions) might slow things down
+;;; on older systems.
+
+;;;(put 'vc-rename-file 'menu-enable 'vc-mode)
+;;;(put 'vc-annotate 'menu-enable '(eq (vc-buffer-backend) 'CVS))
+;;;(put 'vc-version-other-window 'menu-enable 'vc-mode)
+;;;(put 'vc-diff 'menu-enable 'vc-mode)
+;;;(put 'vc-update-change-log 'menu-enable
+;;;     '(eq (vc-buffer-backend) 'RCS))
+;;;(put 'vc-print-log 'menu-enable 'vc-mode)
+;;;(put 'vc-cancel-version 'menu-enable 'vc-mode)
+;;;(put 'vc-revert-buffer 'menu-enable 'vc-mode)
+;;;(put 'vc-insert-headers 'menu-enable 'vc-mode)
+;;;(put 'vc-next-action 'menu-enable 'vc-mode)
+;;;(put 'vc-register 'menu-enable '(and buffer-file-name (not vc-mode)))

 
 (provide 'vc-hooks)
 
 
 (provide 'vc-hooks)