;;; vc-sccs.el --- support for SCCS version-control ;; Copyright (C) 1992,93,94,95,96,97,98,99,2000,2001 Free Software Foundation, Inc. ;; Author: FSF (see vc.el for full credits) ;; Maintainer: Andre Spiegel <spiegel@gnu.org> ;; $Id: vc-sccs.el,v 1.14 2002/02/25 22:05:16 spiegel Exp $ ;; This file is part of GNU Emacs. ;; GNU Emacs is free software; you can redistribute it and/or modify ;; it under the terms of the GNU General Public License as published by ;; the Free Software Foundation; either version 2, or (at your option) ;; any later version. ;; GNU Emacs is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; You should have received a copy of the GNU General Public License ;; along with GNU Emacs; see the file COPYING. If not, write to the ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, ;; Boston, MA 02111-1307, USA. ;;; Commentary: ;;; Code: (eval-when-compile (require 'vc)) ;;; ;;; Customization options ;;; (defcustom vc-sccs-register-switches nil "*Extra switches for registering a file in SCCS. A string or list of strings passed to the checkin program by \\[vc-sccs-register]." :type '(choice (const :tag "None" nil) (string :tag "Argument String") (repeat :tag "Argument List" :value ("") string)) :version "21.1" :group 'vc) (defcustom vc-sccs-diff-switches nil "*A string or list of strings specifying extra switches for `vcdiff', the diff utility used for SCCS under VC." :type '(choice (const :tag "None" nil) (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 '("%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") ;;; ;;; State-querying functions ;;; ;;;###autoload (progn (defun vc-sccs-registered (f) (vc-default-registered 'SCCS f))) (defun vc-sccs-state (file) "SCCS-specific function to compute the version control state." (with-temp-buffer (if (vc-insert-file (vc-sccs-lock-file file)) (let* ((locks (vc-sccs-parse-locks)) (workfile-version (vc-workfile-version file)) (locking-user (cdr (assoc workfile-version locks)))) (if (not locking-user) (if (vc-workfile-unchanged-p file) 'up-to-date 'unlocked-changes) (if (string= locking-user (vc-user-login-name)) '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)) (owner-uid (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 (vc-user-login-name owner-uid)) ;; Strange permissions. ;; Fall through to real state computation. (vc-sccs-state file))) (vc-sccs-state file)))) (defun vc-sccs-workfile-version (file) "SCCS-specific version of `vc-workfile-version'." (with-temp-buffer (vc-insert-file (vc-name file) "^\001e") (vc-parse-buffer "^\001d D \\([^ ]+\\)" 1))) (defun vc-sccs-checkout-model (file) "SCCS-specific version of `vc-checkout-model'." 'locking) (defun vc-sccs-workfile-unchanged-p (file) "SCCS-specific implementation of vc-workfile-unchanged-p." (zerop (apply 'vc-do-command nil 1 "vcdiff" (vc-name file) (list "--brief" "-q" (concat "-r" (vc-workfile-version file)))))) ;;; ;;; State-changing functions ;;; (defun vc-sccs-register (file &optional rev comment) "Register FILE 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 FILE. `vc-register-switches' and `vc-sccs-register-switches' are passed to the SCCS 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* ((switches (append (if (stringp vc-register-switches) (list vc-register-switches) vc-register-switches) (if (stringp vc-sccs-register-switches) (list vc-sccs-register-switches) vc-sccs-register-switches))) (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-do-command nil 0 "admin" vc-name (and rev (concat "-r" rev)) "-fb" (concat "-i" (file-relative-name file)) (and comment (concat "-y" comment)) switches)) (delete-file file) (if vc-keep-workfiles (vc-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 (file rev comment) "SCCS-specific version of `vc-backend-checkin'." (let ((switches (if (stringp vc-checkin-switches) (list vc-checkin-switches) vc-checkin-switches))) (apply 'vc-do-command nil 0 "delta" (vc-name file) (if rev (concat "-r" rev)) (concat "-y" comment) switches) (if vc-keep-workfiles (vc-do-command nil 0 "get" (vc-name file))))) (defun vc-sccs-checkout (file &optional editable rev workfile) "Retrieve a copy of a saved version of SCCS controlled FILE into a WORKFILE. EDITABLE non-nil means that the file should be writable and locked. REV is the revision to check out into WORKFILE." (let ((filename (or workfile file)) (file-buffer (get-file-buffer file)) switches) (message "Checking out %s..." filename) (save-excursion ;; Change buffers to get local value of vc-checkout-switches. (if file-buffer (set-buffer file-buffer)) (setq switches (if (stringp vc-checkout-switches) (list vc-checkout-switches) vc-checkout-switches)) ;; 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 filename)) (and rev (string= rev "") (setq rev nil)) (if workfile ;; Some SCCS implementations allow checking out directly to a ;; file using the -G option, but then some don't so use the ;; least common denominator approach and use the -p option ;; ala RCS. (let ((vc-modes (logior (file-modes (vc-name file)) (if editable 128 0))) (failed t)) (unwind-protect (progn (let ((coding-system-for-read 'no-conversion) (coding-system-for-write 'no-conversion)) (with-temp-file filename (apply 'vc-do-command (current-buffer) 0 "get" (vc-name file) "-s" ;; suppress diagnostic output (if editable "-e") "-p" (and rev (concat "-r" (vc-sccs-lookup-triple file rev))) switches))) (set-file-modes filename (logior (file-modes (vc-name file)) (if editable 128 0))) (setq failed nil)) (and failed (file-exists-p filename) (delete-file filename)))) (apply 'vc-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" filename))) (defun vc-sccs-revert (file &optional contents-done) "Revert FILE to the version it was based on." (vc-do-command nil 0 "unget" (vc-name file)) (vc-do-command nil 0 "get" (vc-name file)) ;; Checking out explicit versions is not supported under SCCS, yet. ;; We always "revert" to the latest version; therefore ;; vc-workfile-version is cleared here so that it gets recomputed. (vc-file-setprop file 'vc-workfile-version nil)) (defun vc-sccs-cancel-version (file editable) "Undo the most recent checkin of FILE. EDITABLE non-nil means previous version should be locked." (vc-do-command nil 0 "rmdel" (vc-name file) (concat "-r" (vc-workfile-version file))) (vc-do-command nil 0 "get" (vc-name file) (if editable "-e"))) (defun vc-sccs-steal-lock (file &optional rev) "Steal the lock on the current workfile for FILE and revision REV." (vc-do-command nil 0 "unget" (vc-name file) "-n" (if rev (concat "-r" rev))) (vc-do-command nil 0 "get" (vc-name file) "-g" (if rev (concat "-r" rev)))) ;;; ;;; History functions ;;; (defun vc-sccs-print-log (file) "Get change log associated with FILE." (vc-do-command nil 0 "prs" (vc-name file))) (defun vc-sccs-logentry-check () "Check that the log entry in the current buffer is acceptable for SCCS." (when (>= (buffer-size) 512) (goto-char 512) (error "Log must be less than 512 characters; point is now at pos 512"))) (defun vc-sccs-diff (file &optional oldvers newvers) "Get a difference report using SCCS between two versions of FILE." (setq oldvers (vc-sccs-lookup-triple file oldvers)) (setq newvers (vc-sccs-lookup-triple file newvers)) (apply 'vc-do-command "*vc-diff*" 1 "vcdiff" (vc-name file) (append (list "-q" (and oldvers (concat "-r" oldvers)) (and newvers (concat "-r" newvers))) (vc-diff-switches-list 'SCCS)))) ;;; ;;; Snapshot system ;;; (defun vc-sccs-assign-name (file name) "Assign to FILE's latest version a given NAME." (vc-sccs-add-triple name file (vc-workfile-version file))) ;;; ;;; Miscellaneous ;;; (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 snapshot 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)))) ;;; ;;; 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 ((VERSION . USER) (VERSION . 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 version corresponding to a named snapshot of FILE. If NAME is nil or a version 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) ;;; vc-sccs.el ends here