lisp/vc-rcs.el

   1 ;;; vc-rcs.el --- support for RCS version-control
   2
   3 ;; Copyright (C) 1992,93,94,95,96,97,98,99,2000,2001  Free Software Foundation, Inc.
   4
   5 ;; Author:     FSF (see vc.el for full credits)
   6 ;; Maintainer: Andre Spiegel <spiegel@gnu.org>
   7
   8 ;; $Id: vc-rcs.el,v 1.23 2002/02/25 22:04:29 spiegel Exp $
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25 ;; Boston, MA 02111-1307, USA.
  26
  27 ;;; Commentary:
  28
  29 ;; See vc.el
  30
  31 ;;; Code:
  32
  33 ;;;
  34 ;;; Customization options
  35 ;;;
  36
  37 (eval-when-compile
  38   (require 'cl)
  39   (require 'vc))
  40
  41 (defcustom vc-rcs-release nil
  42   "*The release number of your RCS installation, as a string.
  43 If nil, VC itself computes this value when it is first needed."
  44   :type '(choice (const :tag "Auto" nil)
  45                  (string :tag "Specified")
  46                  (const :tag "Unknown" unknown))
  47   :group 'vc)
  48
  49 (defcustom vc-rcs-register-switches nil
  50   "*Extra switches for registering a file in RCS.
  51 A string or list of strings.  These are passed to the checkin program
  52 by \\[vc-rcs-register]."
  53   :type '(choice (const :tag "None" nil)
  54                  (string :tag "Argument String")
  55                  (repeat :tag "Argument List"
  56                          :value ("")
  57                          string))
  58   :version "21.1"
  59   :group 'vc)
  60
  61 (defcustom vc-rcs-diff-switches nil
  62   "*A string or list of strings specifying extra switches for rcsdiff under VC."
  63   :type '(choice (const :tag "None" nil)
  64                  (string :tag "Argument String")
  65                  (repeat :tag "Argument List"
  66                          :value ("")
  67                          string))
  68   :version "21.1"
  69   :group 'vc)
  70
  71 (defcustom vc-rcs-header (or (cdr (assoc 'RCS vc-header-alist)) '("\$Id\$"))
  72   "*Header keywords to be inserted by `vc-insert-headers'."
  73   :type '(repeat string)
  74   :version "21.1"
  75   :group 'vc)
  76
  77 (defcustom vc-rcsdiff-knows-brief nil
  78   "*Indicates whether rcsdiff understands the --brief option.
  79 The value is either `yes', `no', or nil.  If it is nil, VC tries
  80 to use --brief and sets this variable to remember whether it worked."
  81   :type '(choice (const :tag "Work out" nil) (const yes) (const no))
  82   :group 'vc)
  83
  84 ;;;###autoload
  85 (defcustom vc-rcs-master-templates
  86   '("%sRCS/%s,v" "%s%s,v" "%sRCS/%s")
  87   "*Where to look for RCS master files.
  88 For a description of possible values, see `vc-check-master-templates'."
  89   :type '(choice (const :tag "Use standard RCS file names"
  90                         '("%sRCS/%s,v" "%s%s,v" "%sRCS/%s"))
  91                  (repeat :tag "User-specified"
  92                          (choice string
  93                                  function)))
  94   :version "21.1"
  95   :group 'vc)
  96
  97 \f
  98 ;;;
  99 ;;; State-querying functions
 100 ;;;
 101
 102 ;;;###autoload
 103 (progn (defun vc-rcs-registered (f) (vc-default-registered 'RCS f)))
 104
 105 (defun vc-rcs-state (file)
 106   "Implementation of `vc-state' for RCS."
 107   (or (boundp 'vc-rcs-headers-result)
 108       (and vc-consult-headers
 109            (vc-rcs-consult-headers file)))
 110   (let ((state
 111          ;; vc-workfile-version might not be known; in that case the
 112          ;; property is nil.  vc-rcs-fetch-master-state knows how to
 113          ;; handle that.
 114          (vc-rcs-fetch-master-state file
 115                                     (vc-file-getprop file
 116                                                      'vc-workfile-version))))
 117     (if (not (eq state 'up-to-date))
 118         state
 119       (require 'vc)
 120       (if (vc-workfile-unchanged-p file)
 121           'up-to-date
 122         (if (eq (vc-checkout-model file) 'locking)
 123             'unlocked-changes
 124           'edited)))))
 125
 126 (defun vc-rcs-state-heuristic (file)
 127   "State heuristic for RCS."
 128   (let (vc-rcs-headers-result)
 129     (if (and vc-consult-headers
 130              (setq vc-rcs-headers-result
 131                    (vc-rcs-consult-headers file))
 132              (eq vc-rcs-headers-result 'rev-and-lock))
 133         (let ((state (vc-file-getprop file 'vc-state)))
 134           ;; If the headers say that the file is not locked, the
 135           ;; permissions can tell us whether locking is used for
 136           ;; the file or not.
 137           (if (and (eq state 'up-to-date)
 138                    (not (vc-mistrust-permissions file)))
 139               (cond
 140                ((string-match ".rw..-..-." (nth 8 (file-attributes file)))
 141                 (vc-file-setprop file 'vc-checkout-model 'implicit)
 142                 (setq state
 143                       (if (vc-rcs-workfile-is-newer file)
 144                           'edited
 145                         'up-to-date)))
 146                ((string-match ".r-..-..-." (nth 8 (file-attributes file)))
 147                 (vc-file-setprop file 'vc-checkout-model 'locking))))
 148           state)
 149       (if (not (vc-mistrust-permissions file))
 150           (let* ((attributes  (file-attributes file))
 151                  (owner-uid   (nth 2 attributes))
 152                  (permissions (nth 8 attributes)))
 153             (cond ((string-match ".r-..-..-." permissions)
 154                    (vc-file-setprop file 'vc-checkout-model 'locking)
 155                    'up-to-date)
 156                   ((string-match ".rw..-..-." permissions)
 157                    (if (eq (vc-checkout-model file) 'locking)
 158                        (if (file-ownership-preserved-p file)
 159                            'edited
 160                          (vc-user-login-name owner-uid))
 161                      (if (vc-rcs-workfile-is-newer file)
 162                          'edited
 163                        'up-to-date)))
 164                   (t
 165                    ;; Strange permissions.  Fall through to
 166                    ;; expensive state computation.
 167                    (vc-rcs-state file))))
 168         (vc-rcs-state file)))))
 169
 170 (defun vc-rcs-workfile-version (file)
 171   "RCS-specific version of `vc-workfile-version'."
 172   (or (and vc-consult-headers
 173            (vc-rcs-consult-headers file)
 174            (vc-file-getprop file 'vc-workfile-version))
 175       (progn
 176         (vc-rcs-fetch-master-state file)
 177         (vc-file-getprop file 'vc-workfile-version))))
 178
 179 (defun vc-rcs-latest-on-branch-p (file &optional version)
 180   "Return non-nil if workfile version of FILE is the latest on its branch.
 181 When VERSION is given, perform check for that version."
 182   (unless version (setq version (vc-workfile-version file)))
 183   (with-temp-buffer
 184     (string= version
 185              (if (vc-trunk-p version)
 186                  (progn
 187                    ;; Compare VERSION to the head version number.
 188                    (vc-insert-file (vc-name file) "^[0-9]")
 189                    (vc-parse-buffer "^head[ \t\n]+\\([^;]+\\);" 1))
 190                ;; If we are not on the trunk, we need to examine the
 191                ;; whole current branch.
 192                (vc-insert-file (vc-name file) "^desc")
 193                (vc-rcs-find-most-recent-rev (vc-branch-part version))))))
 194
 195 (defun vc-rcs-checkout-model (file)
 196   "RCS-specific version of `vc-checkout-model'."
 197   (vc-rcs-consult-headers file)
 198   (or (vc-file-getprop file 'vc-checkout-model)
 199       (progn (vc-rcs-fetch-master-state file)
 200              (vc-file-getprop file 'vc-checkout-model))))
 201
 202 (defun vc-rcs-workfile-unchanged-p (file)
 203   "RCS-specific implementation of vc-workfile-unchanged-p."
 204   ;; Try to use rcsdiff --brief.  If rcsdiff does not understand that,
 205   ;; do a double take and remember the fact for the future
 206   (let* ((version (concat "-r" (vc-workfile-version file)))
 207          (status (if (eq vc-rcsdiff-knows-brief 'no)
 208                      (vc-do-command nil 1 "rcsdiff" file version)
 209                    (vc-do-command nil 2 "rcsdiff" file "--brief" version))))
 210     (if (eq status 2)
 211         (if (not vc-rcsdiff-knows-brief)
 212             (setq vc-rcsdiff-knows-brief 'no
 213                   status (vc-do-command nil 1 "rcsdiff" file version))
 214           (error "rcsdiff failed"))
 215       (if (not vc-rcsdiff-knows-brief) (setq vc-rcsdiff-knows-brief 'yes)))
 216     ;; The workfile is unchanged if rcsdiff found no differences.
 217     (zerop status)))
 218
 219 \f
 220 ;;;
 221 ;;; State-changing functions
 222 ;;;
 223
 224 (defun vc-rcs-register (file &optional rev comment)
 225   "Register FILE into the RCS version-control system.
 226 REV is the optional revision number for the file.  COMMENT can be used
 227 to provide an initial description of FILE.
 228
 229 `vc-register-switches' and `vc-rcs-register-switches' are passed to
 230 the RCS command (in that order).
 231
 232 Automatically retrieve a read-only version of the file with keywords
 233 expanded if `vc-keep-workfiles' is non-nil, otherwise, delete the workfile."
 234     (let ((subdir (expand-file-name "RCS" (file-name-directory file)))
 235           (switches (append
 236                      (if (stringp vc-register-switches)
 237                          (list vc-register-switches)
 238                        vc-register-switches)
 239                      (if (stringp vc-rcs-register-switches)
 240                      (list vc-rcs-register-switches)
 241                      vc-rcs-register-switches))))
 242
 243       (and (not (file-exists-p subdir))
 244            (not (directory-files (file-name-directory file)
 245                                  nil ".*,v$" t))
 246            (yes-or-no-p "Create RCS subdirectory? ")
 247            (make-directory subdir))
 248       (apply 'vc-do-command nil 0 "ci" file
 249              ;; if available, use the secure registering option
 250              (and (vc-rcs-release-p "5.6.4") "-i")
 251              (concat (if vc-keep-workfiles "-u" "-r") rev)
 252              (and comment (concat "-t-" comment))
 253              switches)
 254       ;; parse output to find master file name and workfile version
 255       (with-current-buffer "*vc*"
 256         (goto-char (point-min))
 257         (let ((name (if (looking-at (concat "^\\(.*\\)  <--  "
 258                                             (file-name-nondirectory file)))
 259                         (match-string 1))))
 260           (if (not name)
 261               ;; if we couldn't find the master name,
 262               ;; run vc-rcs-registered to get it
 263               ;; (will be stored into the vc-name property)
 264               (vc-rcs-registered file)
 265             (vc-file-setprop file 'vc-name
 266                              (if (file-name-absolute-p name)
 267                                  name
 268                                (expand-file-name
 269                                 name
 270                                 (file-name-directory file))))))
 271         (vc-file-setprop file 'vc-workfile-version
 272                          (if (re-search-forward
 273                               "^initial revision: \\([0-9.]+\\).*\n"
 274                               nil t)
 275                              (match-string 1))))))
 276
 277 (defun vc-rcs-responsible-p (file)
 278   "Return non-nil if RCS thinks it would be responsible for registering FILE."
 279   ;; TODO: check for all the patterns in vc-rcs-master-templates
 280   (file-directory-p (expand-file-name "RCS" (file-name-directory file))))
 281
 282 (defun vc-rcs-receive-file (file rev)
 283   "Implementation of receive-file for RCS."
 284   (let ((checkout-model (vc-checkout-model file)))
 285     (vc-rcs-register file rev "")
 286     (when (eq checkout-model 'implicit)
 287       (vc-rcs-set-non-strict-locking file))
 288     (vc-rcs-set-default-branch file (concat rev ".1"))))
 289
 290 (defun vc-rcs-unregister (file)
 291   "Unregister FILE from RCS.
 292 If this leaves the RCS subdirectory empty, ask the user
 293 whether to remove it."
 294   (let* ((master (vc-name file))
 295          (dir (file-name-directory master))
 296          (backup-info (find-backup-file-name master)))
 297     (if (not backup-info)
 298         (delete-file master)
 299       (rename-file master (car backup-info) 'ok-if-already-exists)
 300       (dolist (f (cdr backup-info)) (ignore-errors (delete-file f))))
 301     (and (string= (file-name-nondirectory (directory-file-name dir)) "RCS")
 302          ;; check whether RCS dir is empty, i.e. it does not
 303          ;; contain any files except "." and ".."
 304          (not (directory-files dir nil
 305                                "^\\([^.]\\|\\.[^.]\\|\\.\\.[^.]\\).*"))
 306          (yes-or-no-p (format "Directory %s is empty; remove it? " dir))
 307          (delete-directory dir))))
 308
 309 (defun vc-rcs-checkin (file rev comment)
 310   "RCS-specific version of `vc-backend-checkin'."
 311   (let ((switches (if (stringp vc-checkin-switches)
 312                       (list vc-checkin-switches)
 313                     vc-checkin-switches)))
 314     (let ((old-version (vc-workfile-version file)) new-version
 315           (default-branch (vc-file-getprop file 'vc-rcs-default-branch)))
 316       ;; Force branch creation if an appropriate
 317       ;; default branch has been set.
 318       (and (not rev)
 319            default-branch
 320            (string-match (concat "^" (regexp-quote old-version) "\\.")
 321                          default-branch)
 322            (setq rev default-branch)
 323            (setq switches (cons "-f" switches)))
 324       (apply 'vc-do-command nil 0 "ci" (vc-name file)
 325              ;; if available, use the secure check-in option
 326              (and (vc-rcs-release-p "5.6.4") "-j")
 327              (concat (if vc-keep-workfiles "-u" "-r") rev)
 328              (concat "-m" comment)
 329              switches)
 330       (vc-file-setprop file 'vc-workfile-version nil)
 331
 332       ;; determine the new workfile version
 333       (set-buffer "*vc*")
 334       (goto-char (point-min))
 335       (when (or (re-search-forward
 336                  "new revision: \\([0-9.]+\\);" nil t)
 337                 (re-search-forward
 338                  "reverting to previous revision \\([0-9.]+\\)" nil t))
 339         (setq new-version (match-string 1))
 340         (vc-file-setprop file 'vc-workfile-version new-version))
 341
 342       ;; if we got to a different branch, adjust the default
 343       ;; branch accordingly
 344       (cond
 345        ((and old-version new-version
 346              (not (string= (vc-branch-part old-version)
 347                            (vc-branch-part new-version))))
 348         (vc-rcs-set-default-branch file
 349                                    (if (vc-trunk-p new-version) nil
 350                                      (vc-branch-part new-version)))
 351         ;; If this is an old RCS release, we might have
 352         ;; to remove a remaining lock.
 353         (if (not (vc-rcs-release-p "5.6.2"))
 354             ;; exit status of 1 is also accepted.
 355             ;; It means that the lock was removed before.
 356             (vc-do-command nil 1 "rcs" (vc-name file)
 357                            (concat "-u" old-version))))))))
 358
 359 (defun vc-rcs-checkout (file &optional editable rev workfile)
 360   "Retrieve a copy of a saved version of FILE into a workfile."
 361   (let ((filename (or workfile file))
 362         (file-buffer (get-file-buffer file))
 363         switches)
 364     (message "Checking out %s..." filename)
 365     (save-excursion
 366       ;; Change buffers to get local value of vc-checkout-switches.
 367       (if file-buffer (set-buffer file-buffer))
 368       (setq switches (if (stringp vc-checkout-switches)
 369                          (list vc-checkout-switches)
 370                        vc-checkout-switches))
 371       ;; Save this buffer's default-directory
 372       ;; and use save-excursion to make sure it is restored
 373       ;; in the same buffer it was saved in.
 374       (let ((default-directory default-directory))
 375         (save-excursion
 376           ;; Adjust the default-directory so that the check-out creates
 377           ;; the file in the right place.
 378           (setq default-directory (file-name-directory filename))
 379           (if workfile  ;; RCS
 380               ;; RCS can't check out into arbitrary file names directly.
 381               ;; Use `co -p' and make stdout point to the correct file.
 382               (let ((vc-modes (logior (file-modes (vc-name file))
 383                                       (if editable 128 0)))
 384                     (failed t))
 385                 (unwind-protect
 386                     (progn
 387                       (let ((coding-system-for-read 'no-conversion)
 388                             (coding-system-for-write 'no-conversion))
 389                         (with-temp-file filename
 390                           (apply 'vc-do-command
 391                                  (current-buffer) 0 "co" (vc-name file)
 392                                  "-q" ;; suppress diagnostic output
 393                                  (if editable "-l")
 394                                  (concat "-p" rev)
 395                                  switches)))
 396                       (set-file-modes filename
 397                                       (logior (file-modes (vc-name file))
 398                                               (if editable 128 0)))
 399                       (setq failed nil))
 400                   (and failed (file-exists-p filename)
 401                        (delete-file filename))))
 402             (let (new-version)
 403               ;; if we should go to the head of the trunk,
 404               ;; clear the default branch first
 405               (and rev (string= rev "")
 406                    (vc-rcs-set-default-branch file nil))
 407               ;; now do the checkout
 408               (apply 'vc-do-command
 409                      nil 0 "co" (vc-name file)
 410                      ;; If locking is not strict, force to overwrite
 411                      ;; the writable workfile.
 412                      (if (eq (vc-checkout-model file) 'implicit) "-f")
 413                      (if editable "-l")
 414                      (if rev (concat "-r" rev)
 415                        ;; if no explicit revision was specified,
 416                        ;; check out that of the working file
 417                        (let ((workrev (vc-workfile-version file)))
 418                          (if workrev (concat "-r" workrev)
 419                            nil)))
 420                      switches)
 421               ;; determine the new workfile version
 422               (with-current-buffer "*vc*"
 423                 (setq new-version
 424                       (vc-parse-buffer "^revision \\([0-9.]+\\).*\n" 1)))
 425               (vc-file-setprop file 'vc-workfile-version new-version)
 426               ;; if necessary, adjust the default branch
 427               (and rev (not (string= rev ""))
 428                    (vc-rcs-set-default-branch
 429                     file
 430                     (if (vc-rcs-latest-on-branch-p file new-version)
 431                         (if (vc-trunk-p new-version) nil
 432                           (vc-branch-part new-version))
 433                       new-version))))))
 434         (message "Checking out %s...done" filename)))))
 435
 436 (defun vc-rcs-revert (file &optional contents-done)
 437   "Revert FILE to the version it was based on."
 438   (vc-do-command nil 0 "co" (vc-name file) "-f"
 439                  (concat "-u" (vc-workfile-version file))))
 440
 441 (defun vc-rcs-cancel-version (file editable)
 442   "Undo the most recent checkin of FILE.
 443 EDITABLE non-nil means previous version should be locked."
 444   (let* ((target (vc-workfile-version file))
 445          (previous (if (vc-trunk-p target) "" (vc-branch-part target)))
 446          (config (current-window-configuration))
 447          (done nil))
 448     (vc-do-command nil 0 "rcs" (vc-name file) (concat "-o" target))
 449     ;; Check out the most recent remaining version.  If it fails, because
 450     ;; the whole branch got deleted, do a double-take and check out the
 451     ;; version where the branch started.
 452     (while (not done)
 453       (condition-case err
 454           (progn
 455             (vc-do-command nil 0 "co" (vc-name file) "-f"
 456                            (concat (if editable "-l" "-u") previous))
 457             (setq done t))
 458         (error (set-buffer "*vc*")
 459                (goto-char (point-min))
 460                (if (search-forward "no side branches present for" nil t)
 461                    (progn (setq previous (vc-branch-part previous))
 462                           (vc-rcs-set-default-branch file previous)
 463                           ;; vc-do-command popped up a window with
 464                           ;; the error message.  Get rid of it, by
 465                           ;; restoring the old window configuration.
 466                           (set-window-configuration config))
 467                  ;; No, it was some other error: re-signal it.
 468                  (signal (car err) (cdr err))))))))
 469
 470 (defun vc-rcs-merge (file first-version &optional second-version)
 471   "Merge changes into current working copy of FILE.
 472 The changes are between FIRST-VERSION and SECOND-VERSION."
 473   (vc-do-command nil 1 "rcsmerge" (vc-name file)
 474                  "-kk"                  ; ignore keyword conflicts
 475                  (concat "-r" first-version)
 476                  (if second-version (concat "-r" second-version))))
 477
 478 (defun vc-rcs-steal-lock (file &optional rev)
 479   "Steal the lock on the current workfile for FILE and revision REV.
 480 Needs RCS 5.6.2 or later for -M."
 481   (vc-do-command nil 0 "rcs" (vc-name file) "-M" (concat "-u" rev))
 482   ;; Do a real checkout after stealing the lock, so that we see
 483   ;; expanded headers.
 484   (vc-do-command nil 0 "co" (vc-name file) "-f" (concat "-l" rev)))
 485
 486
 487 \f
 488 ;;;
 489 ;;; History functions
 490 ;;;
 491
 492 (defun vc-rcs-print-log (file)
 493   "Get change log associated with FILE."
 494   (vc-do-command nil 0 "rlog" (vc-name file)))
 495
 496 (defun vc-rcs-show-log-entry (version)
 497   (when (re-search-forward
 498          ;; also match some context, for safety
 499          (concat "----\nrevision " version
 500                  "\\(\tlocked by:.*\n\\|\n\\)date: ") nil t)
 501     ;; set the display window so that
 502     ;; the whole log entry is displayed
 503     (let (start end lines)
 504       (beginning-of-line) (forward-line -1) (setq start (point))
 505       (if (not (re-search-forward "^----*\nrevision" nil t))
 506           (setq end (point-max))
 507         (beginning-of-line) (forward-line -1) (setq end (point)))
 508       (setq lines (count-lines start end))
 509       (cond
 510        ;; if the global information and this log entry fit
 511        ;; into the window, display from the beginning
 512        ((< (count-lines (point-min) end) (window-height))
 513         (goto-char (point-min))
 514         (recenter 0)
 515         (goto-char start))
 516        ;; if the whole entry fits into the window,
 517        ;; display it centered
 518        ((< (1+ lines) (window-height))
 519         (goto-char start)
 520         (recenter (1- (- (/ (window-height) 2) (/ lines 2)))))
 521        ;; otherwise (the entry is too large for the window),
 522        ;; display from the start
 523        (t
 524         (goto-char start)
 525         (recenter 0))))))
 526
 527 (defun vc-rcs-diff (file &optional oldvers newvers)
 528   "Get a difference report using RCS between two versions of FILE."
 529   (if (not oldvers) (setq oldvers (vc-workfile-version file)))
 530   (apply 'vc-do-command "*vc-diff*" 1 "rcsdiff" file
 531          (append (list "-q"
 532                        (concat "-r" oldvers)
 533                        (and newvers (concat "-r" newvers)))
 534                  (vc-diff-switches-list 'RCS))))
 535
 536 \f
 537 ;;;
 538 ;;; Snapshot system
 539 ;;;
 540
 541 (defun vc-rcs-assign-name (file name)
 542   "Assign to FILE's latest version a given NAME."
 543   (vc-do-command nil 0 "rcs" (vc-name file) (concat "-n" name ":")))
 544
 545 \f
 546 ;;;
 547 ;;; Miscellaneous
 548 ;;;
 549
 550 (defun vc-rcs-check-headers ()
 551   "Check if the current file has any headers in it."
 552   (save-excursion
 553     (goto-char (point-min))
 554          (re-search-forward "\\$[A-Za-z\300-\326\330-\366\370-\377]+\
 555 \\(: [\t -#%-\176\240-\377]*\\)?\\$" nil t)))
 556
 557 (defun vc-rcs-clear-headers ()
 558   "Implementation of vc-clear-headers for RCS."
 559   (let ((case-fold-search nil))
 560     (goto-char (point-min))
 561     (while (re-search-forward
 562             (concat "\\$\\(Author\\|Date\\|Header\\|Id\\|Locker\\|Name\\|"
 563                     "RCSfile\\|Revision\\|Source\\|State\\): [^$\n]+\\$")
 564             nil t)
 565       (replace-match "$\\1$"))))
 566
 567 (defun vc-rcs-rename-file (old new)
 568   ;; Just move the master file (using vc-rcs-master-templates).
 569   (vc-rename-master (vc-name old) new vc-rcs-master-templates))
 570
 571 \f
 572 ;;;
 573 ;;; Internal functions
 574 ;;;
 575
 576 (defun vc-rcs-workfile-is-newer (file)
 577   "Return non-nil if FILE is newer than its RCS master.
 578 This likely means that FILE has been changed with respect
 579 to its master version."
 580   (let ((file-time (nth 5 (file-attributes file)))
 581         (master-time (nth 5 (file-attributes (vc-name file)))))
 582     (or (> (nth 0 file-time) (nth 0 master-time))
 583         (and (= (nth 0 file-time) (nth 0 master-time))
 584              (> (nth 1 file-time) (nth 1 master-time))))))
 585
 586 (defun vc-rcs-find-most-recent-rev (branch)
 587   "Find most recent revision on BRANCH."
 588   (goto-char (point-min))
 589   (let ((latest-rev -1) value)
 590     (while (re-search-forward (concat "^\\(" (regexp-quote branch)
 591                                       "\\.\\([0-9]+\\)\\)\ndate[ \t]+[0-9.]+;")
 592                               nil t)
 593       (let ((rev (string-to-number (match-string 2))))
 594         (when (< latest-rev rev)
 595           (setq latest-rev rev)
 596           (setq value (match-string 1)))))
 597     (or value
 598         (vc-branch-part branch))))
 599
 600 (defun vc-rcs-fetch-master-state (file &optional workfile-version)
 601   "Compute the master file's idea of the state of FILE.
 602 If a WORKFILE-VERSION is given, compute the state of that version,
 603 otherwise determine the workfile version based on the master file.
 604 This function sets the properties `vc-workfile-version' and
 605 `vc-checkout-model' to their correct values, based on the master
 606 file."
 607   (with-temp-buffer
 608     (vc-insert-file (vc-name file) "^[0-9]")
 609     (let ((workfile-is-latest nil)
 610           (default-branch (vc-parse-buffer "^branch[ \t\n]+\\([^;]*\\);" 1)))
 611       (vc-file-setprop file 'vc-rcs-default-branch default-branch)
 612       (unless workfile-version
 613         ;; Workfile version not known yet.  Determine that first.  It
 614         ;; is either the head of the trunk, the head of the default
 615         ;; branch, or the "default branch" itself, if that is a full
 616         ;; revision number.
 617         (cond
 618          ;; no default branch
 619          ((or (not default-branch) (string= "" default-branch))
 620           (setq workfile-version
 621                 (vc-parse-buffer "^head[ \t\n]+\\([^;]+\\);" 1))
 622           (setq workfile-is-latest t))
 623          ;; default branch is actually a revision
 624          ((string-match "^[0-9]+\\.[0-9]+\\(\\.[0-9]+\\.[0-9]+\\)*$"
 625                         default-branch)
 626           (setq workfile-version default-branch))
 627          ;; else, search for the head of the default branch
 628          (t (vc-insert-file (vc-name file) "^desc")
 629             (setq workfile-version
 630                   (vc-rcs-find-most-recent-rev default-branch))
 631             (setq workfile-is-latest t)))
 632         (vc-file-setprop file 'vc-workfile-version workfile-version))
 633       ;; Check strict locking
 634       (goto-char (point-min))
 635       (vc-file-setprop file 'vc-checkout-model
 636                        (if (re-search-forward ";[ \t\n]*strict;" nil t)
 637                            'locking 'implicit))
 638       ;; Compute state of workfile version
 639       (goto-char (point-min))
 640       (let ((locking-user
 641              (vc-parse-buffer (concat "^locks[ \t\n]+[^;]*[ \t\n]+\\([^:]+\\):"
 642                                       (regexp-quote workfile-version)
 643                                       "[^0-9.]")
 644                               1)))
 645         (cond
 646          ;; not locked
 647          ((not locking-user)
 648           (if (or workfile-is-latest
 649                   (vc-rcs-latest-on-branch-p file workfile-version))
 650               ;; workfile version is latest on branch
 651               'up-to-date
 652             ;; workfile version is not latest on branch
 653             'needs-patch))
 654          ;; locked by the calling user
 655          ((and (stringp locking-user)
 656                (string= locking-user (vc-user-login-name)))
 657           (if (or (eq (vc-checkout-model file) 'locking)
 658                   workfile-is-latest
 659                   (vc-rcs-latest-on-branch-p file workfile-version))
 660               'edited
 661             ;; Locking is not used for the file, but the owner does
 662             ;; have a lock, and there is a higher version on the current
 663             ;; branch.  Not sure if this can occur, and if it is right
 664             ;; to use `needs-merge' in this case.
 665             'needs-merge))
 666          ;; locked by somebody else
 667          ((stringp locking-user)
 668           locking-user)
 669          (t
 670           (error "Error getting state of RCS file")))))))
 671
 672 (defun vc-rcs-consult-headers (file)
 673   "Search for RCS headers in FILE, and set properties accordingly.
 674
 675 Returns: nil            if no headers were found
 676          'rev           if a workfile revision was found
 677          'rev-and-lock  if revision and lock info was found"
 678   (cond
 679    ((not (get-file-buffer file)) nil)
 680    ((let (status version locking-user)
 681      (save-excursion
 682       (set-buffer (get-file-buffer file))
 683       (goto-char (point-min))
 684       (cond
 685        ;; search for $Id or $Header
 686        ;; -------------------------
 687        ;; The `\ 's below avoid an RCS 5.7 bug when checking in this file.
 688        ((or (and (search-forward "$Id\ : " nil t)
 689                  (looking-at "[^ ]+ \\([0-9.]+\\) "))
 690             (and (progn (goto-char (point-min))
 691                         (search-forward "$Header\ : " nil t))
 692                  (looking-at "[^ ]+ \\([0-9.]+\\) ")))
 693         (goto-char (match-end 0))
 694         ;; if found, store the revision number ...
 695         (setq version (match-string-no-properties 1))
 696         ;; ... and check for the locking state
 697         (cond
 698          ((looking-at
 699            (concat "[0-9]+[/-][01][0-9][/-][0-3][0-9] "             ; date
 700             "[0-2][0-9]:[0-5][0-9]+:[0-6][0-9]+\\([+-][0-9:]+\\)? " ; time
 701                    "[^ ]+ [^ ]+ "))                       ; author & state
 702           (goto-char (match-end 0)) ; [0-6] in regexp handles leap seconds
 703           (cond
 704            ;; unlocked revision
 705            ((looking-at "\\$")
 706             (setq locking-user 'none)
 707             (setq status 'rev-and-lock))
 708            ;; revision is locked by some user
 709            ((looking-at "\\([^ ]+\\) \\$")
 710             (setq locking-user (match-string-no-properties 1))
 711             (setq status 'rev-and-lock))
 712            ;; everything else: false
 713            (nil)))
 714          ;; unexpected information in
 715          ;; keyword string --> quit
 716          (nil)))
 717        ;; search for $Revision
 718        ;; --------------------
 719        ((re-search-forward (concat "\\$"
 720                                    "Revision: \\([0-9.]+\\) \\$")
 721                            nil t)
 722         ;; if found, store the revision number ...
 723         (setq version (match-string-no-properties 1))
 724         ;; and see if there's any lock information
 725         (goto-char (point-min))
 726         (if (re-search-forward (concat "\\$" "Locker:") nil t)
 727             (cond ((looking-at " \\([^ ]+\\) \\$")
 728                    (setq locking-user (match-string-no-properties 1))
 729                    (setq status 'rev-and-lock))
 730                   ((looking-at " *\\$")
 731                    (setq locking-user 'none)
 732                    (setq status 'rev-and-lock))
 733                   (t
 734                    (setq locking-user 'none)
 735                    (setq status 'rev-and-lock)))
 736           (setq status 'rev)))
 737        ;; else: nothing found
 738        ;; -------------------
 739        (t nil)))
 740      (if status (vc-file-setprop file 'vc-workfile-version version))
 741      (and (eq status 'rev-and-lock)
 742           (vc-file-setprop file 'vc-state
 743                            (cond
 744                             ((eq locking-user 'none) 'up-to-date)
 745                             ((string= locking-user (vc-user-login-name)) 'edited)
 746                             (t locking-user)))
 747           ;; If the file has headers, we don't want to query the
 748           ;; master file, because that would eliminate all the
 749           ;; performance gain the headers brought us.  We therefore
 750           ;; use a heuristic now to find out whether locking is used
 751           ;; for this file.  If we trust the file permissions, and the
 752           ;; file is not locked, then if the file is read-only we
 753           ;; assume that locking is used for the file, otherwise
 754           ;; locking is not used.
 755           (not (vc-mistrust-permissions file))
 756           (vc-up-to-date-p file)
 757           (if (string-match ".r-..-..-." (nth 8 (file-attributes file)))
 758               (vc-file-setprop file 'vc-checkout-model 'locking)
 759             (vc-file-setprop file 'vc-checkout-model 'implicit)))
 760      status))))
 761
 762 (defun vc-release-greater-or-equal (r1 r2)
 763   "Compare release numbers, represented as strings.
 764 Release components are assumed cardinal numbers, not decimal fractions
 765 \(5.10 is a higher release than 5.9\).  Omitted fields are considered
 766 lower \(5.6.7 is earlier than 5.6.7.1\).  Comparison runs till the end
 767 of the string is found, or a non-numeric component shows up \(5.6.7 is
 768 earlier than \"5.6.7 beta\", which is probably not what you want in
 769 some cases\).  This code is suitable for existing RCS release numbers.
 770 CVS releases are handled reasonably, too \(1.3 < 1.4* < 1.5\)."
 771   (let (v1 v2 i1 i2)
 772     (catch 'done
 773       (or (and (string-match "^\\.?\\([0-9]+\\)" r1)
 774                (setq i1 (match-end 0))
 775                (setq v1 (string-to-number (match-string 1 r1)))
 776                (or (and (string-match "^\\.?\\([0-9]+\\)" r2)
 777                         (setq i2 (match-end 0))
 778                         (setq v2 (string-to-number (match-string 1 r2)))
 779                         (if (> v1 v2) (throw 'done t)
 780                           (if (< v1 v2) (throw 'done nil)
 781                             (throw 'done
 782                                    (vc-release-greater-or-equal
 783                                     (substring r1 i1)
 784                                     (substring r2 i2)))))))
 785                    (throw 'done t)))
 786           (or (and (string-match "^\\.?\\([0-9]+\\)" r2)
 787                    (throw 'done nil))
 788               (throw 'done t)))))
 789
 790 (defun vc-rcs-release-p (release)
 791   "Return t if we have RELEASE or better."
 792   (let ((installation (vc-rcs-system-release)))
 793     (if (and installation
 794              (not (eq installation 'unknown)))
 795         (vc-release-greater-or-equal installation release))))
 796
 797
 798 (defun vc-rcs-system-release ()
 799   "Return the RCS release installed on this system, as a string.
 800 Return symbol UNKNOWN if the release cannot be deducted.  The user can
 801 override this using variable `vc-rcs-release'.
 802
 803 If the user has not set variable `vc-rcs-release' and it is nil,
 804 variable `vc-rcs-release' is set to the returned value."
 805   (or vc-rcs-release
 806       (setq vc-rcs-release
 807             (or (and (zerop (vc-do-command nil nil "rcs" nil "-V"))
 808                      (with-current-buffer (get-buffer "*vc*")
 809                        (vc-parse-buffer "^RCS version \\([0-9.]+ *.*\\)" 1)))
 810                 'unknown))))
 811
 812 (defun vc-rcs-set-non-strict-locking (file)
 813   (vc-do-command nil 0 "rcs" file "-U")
 814   (vc-file-setprop file 'vc-checkout-model 'implicit)
 815   (set-file-modes file (logior (file-modes file) 128)))
 816
 817 (defun vc-rcs-set-default-branch (file branch)
 818   (vc-do-command nil 0 "rcs" (vc-name file) (concat "-b" branch))
 819   (vc-file-setprop file 'vc-rcs-default-branch branch))
 820
 821 (provide 'vc-rcs)
 822
 823 ;;; vc-rcs.el ends here