+(defun vc-rcs-workfile-unchanged-p (file)
+ "RCS-specific implementation of vc-workfile-unchanged-p."
+ ;; Try to use rcsdiff --brief. If rcsdiff does not understand that,
+ ;; do a double take and remember the fact for the future
+ (let* ((version (concat "-r" (vc-workfile-version file)))
+ (status (if (eq vc-rcsdiff-knows-brief 'no)
+ (vc-do-command nil 1 "rcsdiff" file version)
+ (vc-do-command nil 2 "rcsdiff" file "--brief" version))))
+ (if (eq status 2)
+ (if (not vc-rcsdiff-knows-brief)
+ (setq vc-rcsdiff-knows-brief 'no
+ status (vc-do-command nil 1 "rcsdiff" file version))
+ (error "rcsdiff failed"))
+ (if (not vc-rcsdiff-knows-brief) (setq vc-rcsdiff-knows-brief 'yes)))
+ ;; The workfile is unchanged if rcsdiff found no differences.
+ (zerop status)))
+
+\f
+;;;
+;;; State-changing functions
+;;;
+
+(defun vc-rcs-register (file &optional rev comment)
+ "Register FILE into the RCS version-control system.
+REV is the optional revision number for the file. COMMENT can be used
+to provide an initial description of FILE.
+
+`vc-register-switches' and `vc-rcs-register-switches' are passed to
+the RCS command (in that order).
+
+Automatically retrieve a read-only version of the file with keywords
+expanded if `vc-keep-workfiles' is non-nil, otherwise, delete the workfile."
+ (let ((subdir (expand-file-name "RCS" (file-name-directory file))))
+ (and (not (file-exists-p subdir))
+ (not (directory-files (file-name-directory file)
+ nil ".*,v$" t))
+ (yes-or-no-p "Create RCS subdirectory? ")
+ (make-directory subdir))
+ (apply 'vc-do-command nil 0 "ci" file
+ ;; if available, use the secure registering option
+ (and (vc-rcs-release-p "5.6.4") "-i")
+ (concat (if vc-keep-workfiles "-u" "-r") rev)
+ (and comment (concat "-t-" comment))
+ (vc-switches 'RCS 'register))
+ ;; parse output to find master file name and workfile version
+ (with-current-buffer "*vc*"
+ (goto-char (point-min))
+ (let ((name (if (looking-at (concat "^\\(.*\\) <-- "
+ (file-name-nondirectory file)))
+ (match-string 1))))
+ (if (not name)
+ ;; if we couldn't find the master name,
+ ;; run vc-rcs-registered to get it
+ ;; (will be stored into the vc-name property)
+ (vc-rcs-registered file)
+ (vc-file-setprop file 'vc-name
+ (if (file-name-absolute-p name)
+ name
+ (expand-file-name
+ name
+ (file-name-directory file))))))
+ (vc-file-setprop file 'vc-workfile-version
+ (if (re-search-forward
+ "^initial revision: \\([0-9.]+\\).*\n"
+ nil t)
+ (match-string 1))))))
+
+(defun vc-rcs-responsible-p (file)
+ "Return non-nil if RCS thinks it would be responsible for registering FILE."
+ ;; TODO: check for all the patterns in vc-rcs-master-templates
+ (file-directory-p (expand-file-name "RCS" (file-name-directory file))))
+
+(defun vc-rcs-receive-file (file rev)
+ "Implementation of receive-file for RCS."
+ (let ((checkout-model (vc-checkout-model file)))
+ (vc-rcs-register file rev "")
+ (when (eq checkout-model 'implicit)
+ (vc-rcs-set-non-strict-locking file))
+ (vc-rcs-set-default-branch file (concat rev ".1"))))
+
+(defun vc-rcs-unregister (file)
+ "Unregister FILE from RCS.
+If this leaves the RCS subdirectory empty, ask the user
+whether to remove it."
+ (let* ((master (vc-name file))
+ (dir (file-name-directory master))
+ (backup-info (find-backup-file-name master)))
+ (if (not backup-info)
+ (delete-file master)
+ (rename-file master (car backup-info) 'ok-if-already-exists)
+ (dolist (f (cdr backup-info)) (ignore-errors (delete-file f))))
+ (and (string= (file-name-nondirectory (directory-file-name dir)) "RCS")
+ ;; check whether RCS dir is empty, i.e. it does not
+ ;; contain any files except "." and ".."
+ (not (directory-files dir nil
+ "^\\([^.]\\|\\.[^.]\\|\\.\\.[^.]\\).*"))
+ (yes-or-no-p (format "Directory %s is empty; remove it? " dir))
+ (delete-directory dir))))
+
+(defun vc-rcs-checkin (file rev comment)
+ "RCS-specific version of `vc-backend-checkin'."
+ (let ((switches (vc-switches 'RCS 'checkin)))
+ (let ((old-version (vc-workfile-version file)) new-version
+ (default-branch (vc-file-getprop file 'vc-rcs-default-branch)))
+ ;; Force branch creation if an appropriate
+ ;; default branch has been set.
+ (and (not rev)
+ default-branch
+ (string-match (concat "^" (regexp-quote old-version) "\\.")
+ default-branch)
+ (setq rev default-branch)
+ (setq switches (cons "-f" switches)))
+ (if (and (not rev) old-version)
+ (setq rev (vc-branch-part old-version)))
+ (apply 'vc-do-command nil 0 "ci" (vc-name file)
+ ;; if available, use the secure check-in option
+ (and (vc-rcs-release-p "5.6.4") "-j")
+ (concat (if vc-keep-workfiles "-u" "-r") rev)
+ (concat "-m" comment)
+ switches)
+ (vc-file-setprop file 'vc-workfile-version nil)
+
+ ;; determine the new workfile version
+ (set-buffer "*vc*")
+ (goto-char (point-min))
+ (when (or (re-search-forward
+ "new revision: \\([0-9.]+\\);" nil t)
+ (re-search-forward
+ "reverting to previous revision \\([0-9.]+\\)" nil t))
+ (setq new-version (match-string 1))
+ (vc-file-setprop file 'vc-workfile-version new-version))
+
+ ;; if we got to a different branch, adjust the default
+ ;; branch accordingly
+ (cond
+ ((and old-version new-version
+ (not (string= (vc-branch-part old-version)
+ (vc-branch-part new-version))))
+ (vc-rcs-set-default-branch file
+ (if (vc-trunk-p new-version) nil
+ (vc-branch-part new-version)))
+ ;; If this is an old RCS release, we might have
+ ;; to remove a remaining lock.
+ (if (not (vc-rcs-release-p "5.6.2"))
+ ;; exit status of 1 is also accepted.
+ ;; It means that the lock was removed before.
+ (vc-do-command nil 1 "rcs" (vc-name file)
+ (concat "-u" old-version))))))))
+
+(defun vc-rcs-find-version (file rev buffer)
+ (apply 'vc-do-command
+ buffer 0 "co" (vc-name file)
+ "-q" ;; suppress diagnostic output
+ (concat "-p" rev)
+ (vc-switches 'RCS 'checkout)))
+
+(defun vc-rcs-checkout (file &optional editable rev)
+ "Retrieve a copy of a saved version of FILE."
+ (let ((file-buffer (get-file-buffer file))
+ switches)
+ (message "Checking out %s..." file)
+ (save-excursion
+ ;; Change buffers to get local value of vc-checkout-switches.
+ (if file-buffer (set-buffer file-buffer))
+ (setq switches (vc-switches 'RCS 'checkout))
+ ;; Save this buffer's default-directory
+ ;; and use save-excursion to make sure it is restored
+ ;; in the same buffer it was saved in.
+ (let ((default-directory default-directory))
+ (save-excursion
+ ;; Adjust the default-directory so that the check-out creates
+ ;; the file in the right place.
+ (setq default-directory (file-name-directory file))
+ (let (new-version)
+ ;; if we should go to the head of the trunk,
+ ;; clear the default branch first
+ (and rev (string= rev "")
+ (vc-rcs-set-default-branch file nil))
+ ;; now do the checkout
+ (apply 'vc-do-command
+ nil 0 "co" (vc-name file)
+ ;; If locking is not strict, force to overwrite
+ ;; the writable workfile.
+ (if (eq (vc-checkout-model file) 'implicit) "-f")
+ (if editable "-l")
+ (if (stringp rev)
+ ;; a literal revision was specified
+ (concat "-r" rev)
+ (let ((workrev (vc-workfile-version file)))
+ (if workrev
+ (concat "-r"
+ (if (not rev)
+ ;; no revision specified:
+ ;; use current workfile version
+ workrev
+ ;; REV is t ...
+ (if (not (vc-trunk-p workrev))
+ ;; ... go to head of current branch
+ (vc-branch-part workrev)
+ ;; ... go to head of trunk
+ (vc-rcs-set-default-branch file
+ nil)
+ ""))))))
+ switches)
+ ;; determine the new workfile version
+ (with-current-buffer "*vc*"
+ (setq new-version
+ (vc-parse-buffer "^revision \\([0-9.]+\\).*\n" 1)))
+ (vc-file-setprop file 'vc-workfile-version new-version)
+ ;; if necessary, adjust the default branch
+ (and rev (not (string= rev ""))
+ (vc-rcs-set-default-branch
+ file
+ (if (vc-rcs-latest-on-branch-p file new-version)
+ (if (vc-trunk-p new-version) nil
+ (vc-branch-part new-version))
+ new-version)))))
+ (message "Checking out %s...done" file)))))
+
+(defun vc-rcs-revert (file &optional contents-done)
+ "Revert FILE to the version it was based on."
+ (vc-do-command nil 0 "co" (vc-name file) "-f"
+ (concat (if (eq (vc-state file) 'edited) "-u" "-r")
+ (vc-workfile-version file))))
+
+(defun vc-rcs-cancel-version (file editable)
+ "Undo the most recent checkin of FILE.
+EDITABLE non-nil means previous version should be locked."
+ (let* ((target (vc-workfile-version file))
+ (previous (if (vc-trunk-p target) "" (vc-branch-part target)))
+ (config (current-window-configuration))
+ (done nil))
+ (vc-do-command nil 0 "rcs" (vc-name file) (concat "-o" target))
+ ;; Check out the most recent remaining version. If it fails, because
+ ;; the whole branch got deleted, do a double-take and check out the
+ ;; version where the branch started.
+ (while (not done)
+ (condition-case err
+ (progn
+ (vc-do-command nil 0 "co" (vc-name file) "-f"
+ (concat (if editable "-l" "-u") previous))
+ (setq done t))
+ (error (set-buffer "*vc*")
+ (goto-char (point-min))
+ (if (search-forward "no side branches present for" nil t)
+ (progn (setq previous (vc-branch-part previous))
+ (vc-rcs-set-default-branch file previous)
+ ;; vc-do-command popped up a window with
+ ;; the error message. Get rid of it, by
+ ;; restoring the old window configuration.
+ (set-window-configuration config))
+ ;; No, it was some other error: re-signal it.
+ (signal (car err) (cdr err))))))))
+
+(defun vc-rcs-merge (file first-version &optional second-version)
+ "Merge changes into current working copy of FILE.
+The changes are between FIRST-VERSION and SECOND-VERSION."
+ (vc-do-command nil 1 "rcsmerge" (vc-name file)
+ "-kk" ; ignore keyword conflicts
+ (concat "-r" first-version)
+ (if second-version (concat "-r" second-version))))
+
+(defun vc-rcs-steal-lock (file &optional rev)
+ "Steal the lock on the current workfile for FILE and revision REV.
+Needs RCS 5.6.2 or later for -M."
+ (vc-do-command nil 0 "rcs" (vc-name file) "-M" (concat "-u" rev))
+ ;; Do a real checkout after stealing the lock, so that we see
+ ;; expanded headers.
+ (vc-do-command nil 0 "co" (vc-name file) "-f" (concat "-l" rev)))
+
+
+\f
+;;;
+;;; History functions
+;;;
+
+(defun vc-rcs-print-log (file)
+ "Get change log associated with FILE."
+ (vc-do-command nil 0 "rlog" (vc-name file)))
+
+(defun vc-rcs-diff (file &optional oldvers newvers)
+ "Get a difference report using RCS between two versions of FILE."
+ (if (not oldvers) (setq oldvers (vc-workfile-version file)))
+ (apply 'vc-do-command "*vc-diff*" 1 "rcsdiff" file
+ (append (list "-q"
+ (concat "-r" oldvers)
+ (and newvers (concat "-r" newvers)))
+ (vc-switches 'RCS 'diff))))
+
+\f
+;;;
+;;; Snapshot system
+;;;
+
+(defun vc-rcs-assign-name (file name)
+ "Assign to FILE's latest version a given NAME."
+ (vc-do-command nil 0 "rcs" (vc-name file) (concat "-n" name ":")))
+
+\f
+;;;
+;;; Miscellaneous
+;;;
+
+(defun vc-rcs-check-headers ()
+ "Check if the current file has any headers in it."
+ (save-excursion
+ (goto-char (point-min))
+ (re-search-forward "\\$[A-Za-z\300-\326\330-\366\370-\377]+\
+\\(: [\t -#%-\176\240-\377]*\\)?\\$" nil t)))
+
+(defun vc-rcs-clear-headers ()
+ "Implementation of vc-clear-headers for RCS."
+ (let ((case-fold-search nil))
+ (goto-char (point-min))
+ (while (re-search-forward
+ (concat "\\$\\(Author\\|Date\\|Header\\|Id\\|Locker\\|Name\\|"
+ "RCSfile\\|Revision\\|Source\\|State\\): [^$\n]+\\$")
+ nil t)
+ (replace-match "$\\1$"))))
+
+(defun vc-rcs-rename-file (old new)
+ ;; Just move the master file (using vc-rcs-master-templates).
+ (vc-rename-master (vc-name old) new vc-rcs-master-templates))
+
+\f
+;;;
+;;; Internal functions
+;;;
+
+(defun vc-rcs-workfile-is-newer (file)
+ "Return non-nil if FILE is newer than its RCS master.
+This likely means that FILE has been changed with respect
+to its master version."
+ (let ((file-time (nth 5 (file-attributes file)))
+ (master-time (nth 5 (file-attributes (vc-name file)))))
+ (or (> (nth 0 file-time) (nth 0 master-time))
+ (and (= (nth 0 file-time) (nth 0 master-time))
+ (> (nth 1 file-time) (nth 1 master-time))))))