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+;;; vc-sccs.el --- support for SCCS version-control
+
+;; Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
+;;   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+;;   Free Software Foundation, Inc.
+
+;; Author:     FSF (see vc.el for full credits)
+;; Maintainer: Andre Spiegel <spiegel@gnu.org>
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Proper function of the SCCS diff commands requires the shellscript vcdiff
+;; to be installed somewhere on Emacs's path for executables.
+;;
+
+;;; Code:
+
+(eval-when-compile
+  (require 'vc))
+
+;;;
+;;; Customization options
+;;;
+
+;; ;; Maybe a better solution is to not use "get" but "sccs get".
+;; (defcustom vc-sccs-path
+;;   (let ((path ()))
+;;     (dolist (dir '("/usr/sccs" "/usr/lib/sccs" "/usr/libexec/sccs"))
+;;       (if (file-directory-p dir)
+;;           (push dir path)))
+;;     path)
+;;   "List of extra directories to search for SCCS commands."
+;;   :type '(repeat directory)
+;;   :group 'vc)
+
+(defcustom vc-sccs-register-switches nil
+  "Switches for registering a file in SCCS.
+A string or list of strings passed to the checkin program by
+\\[vc-register].  If nil, use the value of `vc-register-switches'.
+If t, use no switches."
+  :type '(choice (const :tag "Unspecified" nil)
+		 (const :tag "None" t)
+		 (string :tag "Argument String")
+		 (repeat :tag "Argument List" :value ("") string))
+  :version "21.1"
+  :group 'vc)
+
+(defcustom vc-sccs-diff-switches nil
+  "String or list of strings specifying switches for SCCS diff under VC.
+If nil, use the value of `vc-diff-switches'.  If t, use no switches."
+  :type '(choice (const :tag "Unspecified" nil)
+		 (const :tag "None" t)
+		 (string :tag "Argument String")
+		 (repeat :tag "Argument List" :value ("") string))
+  :version "21.1"
+  :group 'vc)
+
+(defcustom vc-sccs-header (or (cdr (assoc 'SCCS vc-header-alist)) '("%W%"))
+  "Header keywords to be inserted by `vc-insert-headers'."
+  :type '(repeat string)
+  :group 'vc)
+
+;;;###autoload
+(defcustom vc-sccs-master-templates
+  (purecopy '("%sSCCS/s.%s" "%ss.%s" vc-sccs-search-project-dir))
+  "Where to look for SCCS master files.
+For a description of possible values, see `vc-check-master-templates'."
+  :type '(choice (const :tag "Use standard SCCS file names"
+			("%sSCCS/s.%s" "%ss.%s" vc-sccs-search-project-dir))
+		 (repeat :tag "User-specified"
+			 (choice string
+				 function)))
+  :version "21.1"
+  :group 'vc)
+
+
+;;;
+;;; Internal variables
+;;;
+
+(defconst vc-sccs-name-assoc-file "VC-names")
+
+
+;;; Properties of the backend
+
+(defun vc-sccs-revision-granularity () 'file)
+(defun vc-sccs-checkout-model (files) 'locking)
+
+;;;
+;;; State-querying functions
+;;;
+
+;; The autoload cookie below places vc-sccs-registered directly into
+;; loaddefs.el, so that vc-sccs.el does not need to be loaded for
+;; every file that is visited.  The definition is repeated below
+;; so that Help and etags can find it.
+
+;;;###autoload (defun vc-sccs-registered(f) (vc-default-registered 'SCCS f))
+(defun vc-sccs-registered (f) (vc-default-registered 'SCCS f))
+
+(defun vc-sccs-state (file)
+  "SCCS-specific function to compute the version control state."
+  (if (not (vc-sccs-registered file))
+      'unregistered
+    (with-temp-buffer
+      (if (vc-insert-file (vc-sccs-lock-file file))
+	  (let* ((locks (vc-sccs-parse-locks))
+		 (working-revision (vc-working-revision file))
+		 (locking-user (cdr (assoc working-revision locks))))
+	    (if (not locking-user)
+		(if (vc-workfile-unchanged-p file)
+		    'up-to-date
+		  'unlocked-changes)
+	      (if (string= locking-user (vc-user-login-name file))
+		  'edited
+		locking-user)))
+	'up-to-date))))
+
+(defun vc-sccs-state-heuristic (file)
+  "SCCS-specific state heuristic."
+  (if (not (vc-mistrust-permissions file))
+      ;;   This implementation assumes that any file which is under version
+      ;; control and has -rw-r--r-- is locked by its owner.  This is true
+      ;; for both RCS and SCCS, which keep unlocked files at -r--r--r--.
+      ;; We have to be careful not to exclude files with execute bits on;
+      ;; scripts can be under version control too.  Also, we must ignore the
+      ;; group-read and other-read bits, since paranoid users turn them off.
+      (let* ((attributes  (file-attributes file 'string))
+             (owner-name  (nth 2 attributes))
+             (permissions (nth 8 attributes)))
+	(if (string-match ".r-..-..-." permissions)
+            'up-to-date
+          (if (string-match ".rw..-..-." permissions)
+              (if (file-ownership-preserved-p file)
+                  'edited
+                owner-name)
+            ;; Strange permissions.
+            ;; Fall through to real state computation.
+            (vc-sccs-state file))))
+    (vc-sccs-state file)))
+
+(defun vc-sccs-dir-status (dir update-function)
+  ;; FIXME: this function should be rewritten, using `vc-expand-dirs'
+  ;; is not TRTD because it returns files from multiple backends.
+  ;; It should also return 'unregistered files.
+
+  ;; Doing lots of individual VC-state calls is painful, but
+  ;; there is no better option in SCCS-land.
+  (let ((flist (vc-expand-dirs (list dir)))
+	(result nil))
+    (dolist (file flist)
+      (let ((state (vc-state file))
+	    (frel (file-relative-name file)))
+	(when (and (eq (vc-backend file) 'SCCS)
+		   (not (eq state 'up-to-date)))
+	  (push (list frel state) result))))
+    (funcall update-function result)))
+
+(defun vc-sccs-working-revision (file)
+  "SCCS-specific version of `vc-working-revision'."
+  (with-temp-buffer
+    ;; The working revision is always the latest revision number.
+    ;; To find this number, search the entire delta table,
+    ;; rather than just the first entry, because the
+    ;; first entry might be a deleted ("R") revision.
+    (vc-insert-file (vc-name file) "^\001e\n\001[^s]")
+    (vc-parse-buffer "^\001d D \\([^ ]+\\)" 1)))
+
+(defun vc-sccs-workfile-unchanged-p (file)
+  "SCCS-specific implementation of `vc-workfile-unchanged-p'."
+  (zerop (apply 'vc-do-command "*vc*" 1 "vcdiff" (vc-name file)
+                (list "--brief" "-q"
+                      (concat "-r" (vc-working-revision file))))))
+
+
+;;;
+;;; State-changing functions
+;;;
+
+(defun vc-sccs-do-command (buffer okstatus command file-or-list &rest flags)
+  ;; (let ((load-path (append vc-sccs-path load-path)))
+  ;;   (apply 'vc-do-command buffer okstatus command file-or-list flags))
+  (apply 'vc-do-command (or buffer "*vc*") okstatus "sccs" file-or-list command flags))
+
+(defun vc-sccs-create-repo ()
+  "Create a new SCCS repository."
+  ;; SCCS is totally file-oriented, so all we have to do is make the directory
+  (make-directory "SCCS"))
+
+(defun vc-sccs-register (files &optional rev comment)
+  "Register FILES into the SCCS version-control system.
+REV is the optional revision number for the file.  COMMENT can be used
+to provide an initial description of FILES.
+Passes either `vc-sccs-register-switches' or `vc-register-switches'
+to the SCCS command.
+
+Automatically retrieve a read-only version of the files with keywords
+expanded if `vc-keep-workfiles' is non-nil, otherwise, delete the workfile."
+  (dolist (file files)
+    (let* ((dirname (or (file-name-directory file) ""))
+	   (basename (file-name-nondirectory file))
+	   (project-file (vc-sccs-search-project-dir dirname basename)))
+      (let ((vc-name
+	     (or project-file
+		 (format (car vc-sccs-master-templates) dirname basename))))
+	(apply 'vc-sccs-do-command nil 0 "admin" vc-name
+	       (and rev (not (string= rev "")) (concat "-r" rev))
+	       "-fb"
+	       (concat "-i" (file-relative-name file))
+	       (and comment (concat "-y" comment))
+	       (vc-switches 'SCCS 'register)))
+      (delete-file file)
+      (if vc-keep-workfiles
+	  (vc-sccs-do-command nil 0 "get" (vc-name file))))))
+
+(defun vc-sccs-responsible-p (file)
+  "Return non-nil if SCCS thinks it would be responsible for registering FILE."
+  ;; TODO: check for all the patterns in vc-sccs-master-templates
+  (or (file-directory-p (expand-file-name "SCCS" (file-name-directory file)))
+      (stringp (vc-sccs-search-project-dir (or (file-name-directory file) "")
+					   (file-name-nondirectory file)))))
+
+(defun vc-sccs-checkin (files rev comment &optional extra-args-ignored)
+  "SCCS-specific version of `vc-backend-checkin'."
+  (dolist (file (vc-expand-dirs files))
+    (apply 'vc-sccs-do-command nil 0 "delta" (vc-name file)
+	   (if rev (concat "-r" rev))
+	   (concat "-y" comment)
+	   (vc-switches 'SCCS 'checkin))
+    (if vc-keep-workfiles
+	(vc-sccs-do-command nil 0 "get" (vc-name file)))))
+
+(defun vc-sccs-find-revision (file rev buffer)
+  (apply 'vc-sccs-do-command
+	 buffer 0 "get" (vc-name file)
+	 "-s" ;; suppress diagnostic output
+	 "-p"
+	 (and rev
+	      (concat "-r"
+		      (vc-sccs-lookup-triple file rev)))
+	 (vc-switches 'SCCS 'checkout)))
+
+(defun vc-sccs-checkout (file &optional editable rev)
+  "Retrieve a copy of a saved revision of SCCS controlled FILE.
+If FILE is a directory, all version-controlled files beneath are checked out.
+EDITABLE non-nil means that the file should be writable and
+locked.  REV is the revision to check out."
+  (if (file-directory-p file)
+      (mapc 'vc-sccs-checkout (vc-expand-dirs (list 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 'SCCS '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))
+
+	    (and rev (or (string= rev "")
+			 (not (stringp rev)))
+		 (setq rev nil))
+	    (apply 'vc-sccs-do-command nil 0 "get" (vc-name file)
+		   (if editable "-e")
+		   (and rev (concat "-r" (vc-sccs-lookup-triple file rev)))
+		   switches))))
+      (message "Checking out %s...done" file))))
+
+(defun vc-sccs-rollback (files)
+  "Roll back, undoing the most recent checkins of FILES.  Directories
+are expanded to all version-controlled subfiles."
+  (setq files (vc-expand-dirs files))
+  (if (not files)
+      (error "SCCS backend doesn't support directory-level rollback"))
+  (dolist (file files)
+	  (let ((discard (vc-working-revision file)))
+	    (if (null (yes-or-no-p (format "Remove version %s from %s history? "
+					   discard file)))
+		(error "Aborted"))
+	    (message "Removing revision %s from %s..." discard file)
+	    (vc-sccs-do-command nil 0 "rmdel"
+                                (vc-name file) (concat "-r" discard))
+	    (vc-sccs-do-command nil 0 "get" (vc-name file) nil))))
+
+(defun vc-sccs-revert (file &optional contents-done)
+  "Revert FILE to the version it was based on. If FILE is a directory,
+revert all subfiles."
+  (if (file-directory-p file)
+      (mapc 'vc-sccs-revert (vc-expand-dirs (list file)))
+    (vc-sccs-do-command nil 0 "unget" (vc-name file))
+    (vc-sccs-do-command nil 0 "get" (vc-name file))
+    ;; Checking out explicit revisions is not supported under SCCS, yet.
+    ;; We always "revert" to the latest revision; therefore
+    ;; vc-working-revision is cleared here so that it gets recomputed.
+    (vc-file-setprop file 'vc-working-revision nil)))
+
+(defun vc-sccs-steal-lock (file &optional rev)
+  "Steal the lock on the current workfile for FILE and revision REV."
+  (if (file-directory-p file)
+      (mapc 'vc-sccs-steal-lock (vc-expand-dirs (list file)))
+    (vc-sccs-do-command nil 0 "unget"
+			(vc-name file) "-n" (if rev (concat "-r" rev)))
+    (vc-sccs-do-command nil 0 "get"
+			(vc-name file) "-g" (if rev (concat "-r" rev)))))
+
+(defun vc-sccs-modify-change-comment (files rev comment)
+  "Modify (actually, append to) the change comments for FILES on a specified REV."
+  (dolist (file (vc-expand-dirs files))
+    (vc-sccs-do-command nil 0 "cdc" (vc-name file)
+                        (concat "-y" comment) (concat "-r" rev))))
+
+
+;;;
+;;; History functions
+;;;
+
+(defun vc-sccs-print-log (files buffer &optional shortlog start-revision-ignored limit)
+  "Get change log associated with FILES."
+  (setq files (vc-expand-dirs files))
+  (vc-sccs-do-command buffer 0 "prs" (mapcar 'vc-name files))
+  (when limit 'limit-unsupported))
+
+(defun vc-sccs-diff (files &optional oldvers newvers buffer)
+  "Get a difference report using SCCS between two filesets."
+  (setq files (vc-expand-dirs files))
+  (setq oldvers (vc-sccs-lookup-triple (car files) oldvers))
+  (setq newvers (vc-sccs-lookup-triple (car files) newvers))
+  (apply 'vc-do-command (or buffer "*vc-diff*")
+	 1 "vcdiff" (mapcar 'vc-name (vc-expand-dirs files))
+         (append (list "-q"
+                       (and oldvers (concat "-r" oldvers))
+                       (and newvers (concat "-r" newvers)))
+                 (vc-switches 'SCCS 'diff))))
+
+
+;;;
+;;; Tag system.  SCCS doesn't have tags, so we simulate them by maintaining
+;;; our own set of name-to-revision mappings.
+;;;
+
+(defun vc-sccs-create-tag (backend dir name branchp)
+  (when branchp
+    (error "SCCS backend %s does not support module branches" backend))
+  (let ((result (vc-tag-precondition dir)))
+    (if (stringp result)
+	(error "File %s is not up-to-date" result)
+      (vc-file-tree-walk
+       dir
+       (lambda (f)
+	 (vc-sccs-add-triple name f (vc-working-revision f)))))))
+
+
+;;;
+;;; Miscellaneous
+;;;
+
+(defun vc-sccs-previous-revision (file rev)
+  (vc-call-backend 'RCS 'previous-revision file rev))
+
+(defun vc-sccs-next-revision (file rev)
+  (vc-call-backend 'RCS 'next-revision file rev))
+
+(defun vc-sccs-check-headers ()
+  "Check if the current file has any headers in it."
+  (save-excursion
+    (goto-char (point-min))
+    (re-search-forward  "%[A-Z]%" nil t)))
+
+(defun vc-sccs-rename-file (old new)
+  ;; Move the master file (using vc-rcs-master-templates).
+  (vc-rename-master (vc-name old) new vc-sccs-master-templates)
+  ;; Update the tag file.
+  (with-current-buffer
+      (find-file-noselect
+       (expand-file-name vc-sccs-name-assoc-file
+			 (file-name-directory (vc-name old))))
+    (goto-char (point-min))
+    ;; (replace-regexp (concat ":" (regexp-quote old) "$") (concat ":" new))
+    (while (re-search-forward (concat ":" (regexp-quote old) "$") nil t)
+      (replace-match (concat ":" new) nil nil))
+    (basic-save-buffer)
+    (kill-buffer (current-buffer))))
+
+(defun vc-sccs-find-file-hook ()
+  ;; 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 (stringp (vc-state buffer-file-name 'SCCS))
+       (setq buffer-read-only t)))
+
+
+;;;
+;;; Internal functions
+;;;
+
+;; This function is wrapped with `progn' so that the autoload cookie
+;; copies the whole function itself into loaddefs.el rather than just placing
+;; a (autoload 'vc-sccs-search-project-dir "vc-sccs") which would not
+;; help us avoid loading vc-sccs.
+;;;###autoload
+(progn (defun vc-sccs-search-project-dir (dirname basename)
+  "Return the name of a master file in the SCCS project directory.
+Does not check whether the file exists but returns nil if it does not
+find any project directory."
+  (let ((project-dir (getenv "PROJECTDIR")) dirs dir)
+    (when project-dir
+      (if (file-name-absolute-p project-dir)
+	  (setq dirs '("SCCS" ""))
+	(setq dirs '("src/SCCS" "src" "source/SCCS" "source"))
+	(setq project-dir (expand-file-name (concat "~" project-dir))))
+      (while (and (not dir) dirs)
+	(setq dir (expand-file-name (car dirs) project-dir))
+	(unless (file-directory-p dir)
+	  (setq dir nil)
+	  (setq dirs (cdr dirs))))
+      (and dir (expand-file-name (concat "s." basename) dir))))))
+
+(defun vc-sccs-lock-file (file)
+  "Generate lock file name corresponding to FILE."
+  (let ((master (vc-name file)))
+    (and
+     master
+     (string-match "\\(.*/\\)\\(s\\.\\)\\(.*\\)" master)
+     (replace-match "p." t t master 2))))
+
+(defun vc-sccs-parse-locks ()
+  "Parse SCCS locks in current buffer.
+The result is a list of the form ((REVISION . USER) (REVISION . USER) ...)."
+  (let (master-locks)
+    (goto-char (point-min))
+    (while (re-search-forward "^\\([0-9.]+\\) [0-9.]+ \\([^ ]+\\) .*\n?"
+			      nil t)
+      (setq master-locks
+	    (cons (cons (match-string 1) (match-string 2)) master-locks)))
+    ;; FIXME: is it really necessary to reverse ?
+    (nreverse master-locks)))
+
+(defun vc-sccs-add-triple (name file rev)
+  (with-current-buffer
+      (find-file-noselect
+       (expand-file-name vc-sccs-name-assoc-file
+			 (file-name-directory (vc-name file))))
+    (goto-char (point-max))
+    (insert name "\t:\t" file "\t" rev "\n")
+    (basic-save-buffer)
+    (kill-buffer (current-buffer))))
+
+(defun vc-sccs-lookup-triple (file name)
+  "Return the numeric revision corresponding to a named tag of FILE.
+If NAME is nil or a revision number string it's just passed through."
+  (if (or (null name)
+	  (let ((firstchar (aref name 0)))
+	    (and (>= firstchar ?0) (<= firstchar ?9))))
+      name
+    (with-temp-buffer
+      (vc-insert-file
+       (expand-file-name vc-sccs-name-assoc-file
+			 (file-name-directory (vc-name file))))
+      (vc-parse-buffer (concat name "\t:\t" file "\t\\(.+\\)") 1))))
+
+(provide 'vc-sccs)
+
+;; arch-tag: d751dee3-d7b3-47e1-95e3-7ae98c052041
+;;; vc-sccs.el ends here