lisp/vc-sccs.el

   1 ;;; vc-sccs.el --- support for SCCS 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-sccs.el,v 1.16 2002/10/08 15:35:03 monnier 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 ;;; Code:
  30
  31 (eval-when-compile
  32   (require 'vc))
  33
  34 ;;;
  35 ;;; Customization options
  36 ;;;
  37
  38 (defcustom vc-sccs-register-switches nil
  39   "*Extra switches for registering a file in SCCS.
  40 A string or list of strings passed to the checkin program by
  41 \\[vc-sccs-register]."
  42   :type '(choice (const :tag "None" nil)
  43                  (string :tag "Argument String")
  44                  (repeat :tag "Argument List"
  45                          :value ("")
  46                          string))
  47   :version "21.1"
  48   :group 'vc)
  49
  50 (defcustom vc-sccs-diff-switches nil
  51   "*A string or list of strings specifying extra switches for `vcdiff',
  52 the diff utility used for SCCS under VC."
  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-sccs-header (or (cdr (assoc 'SCCS vc-header-alist)) '("%W%"))
  62   "*Header keywords to be inserted by `vc-insert-headers'."
  63   :type '(repeat string)
  64   :group 'vc)
  65
  66 ;;;###autoload
  67 (defcustom vc-sccs-master-templates
  68   '("%sSCCS/s.%s" "%ss.%s" vc-sccs-search-project-dir)
  69   "*Where to look for SCCS master files.
  70 For a description of possible values, see `vc-check-master-templates'."
  71   :type '(choice (const :tag "Use standard SCCS file names"
  72                         ("%sSCCS/s.%s" "%ss.%s" vc-sccs-search-project-dir))
  73                  (repeat :tag "User-specified"
  74                          (choice string
  75                                  function)))
  76   :version "21.1"
  77   :group 'vc)
  78
  79 \f
  80 ;;;
  81 ;;; Internal variables
  82 ;;;
  83
  84 (defconst vc-sccs-name-assoc-file "VC-names")
  85
  86 \f
  87 ;;;
  88 ;;; State-querying functions
  89 ;;;
  90
  91 ;;;###autoload
  92 (progn (defun vc-sccs-registered (f) (vc-default-registered 'SCCS f)))
  93
  94 (defun vc-sccs-state (file)
  95   "SCCS-specific function to compute the version control state."
  96   (with-temp-buffer
  97     (if (vc-insert-file (vc-sccs-lock-file file))
  98         (let* ((locks (vc-sccs-parse-locks))
  99                (workfile-version (vc-workfile-version file))
 100                (locking-user (cdr (assoc workfile-version locks))))
 101           (if (not locking-user)
 102               (if (vc-workfile-unchanged-p file)
 103                   'up-to-date
 104                 'unlocked-changes)
 105             (if (string= locking-user (vc-user-login-name))
 106                 'edited
 107               locking-user)))
 108       'up-to-date)))
 109
 110 (defun vc-sccs-state-heuristic (file)
 111   "SCCS-specific state heuristic."
 112   (if (not (vc-mistrust-permissions file))
 113       ;;   This implementation assumes that any file which is under version
 114       ;; control and has -rw-r--r-- is locked by its owner.  This is true
 115       ;; for both RCS and SCCS, which keep unlocked files at -r--r--r--.
 116       ;; We have to be careful not to exclude files with execute bits on;
 117       ;; scripts can be under version control too.  Also, we must ignore the
 118       ;; group-read and other-read bits, since paranoid users turn them off.
 119       (let* ((attributes (file-attributes file))
 120              (owner-uid  (nth 2 attributes))
 121              (permissions (nth 8 attributes)))
 122         (if (string-match ".r-..-..-." permissions)
 123             'up-to-date
 124           (if (string-match ".rw..-..-." permissions)
 125               (if (file-ownership-preserved-p file)
 126                   'edited
 127                 (vc-user-login-name owner-uid))
 128           ;; Strange permissions.
 129           ;; Fall through to real state computation.
 130           (vc-sccs-state file)))
 131     (vc-sccs-state file))))
 132
 133 (defun vc-sccs-workfile-version (file)
 134   "SCCS-specific version of `vc-workfile-version'."
 135   (with-temp-buffer
 136     (vc-insert-file (vc-name file) "^\001e")
 137     (vc-parse-buffer "^\001d D \\([^ ]+\\)" 1)))
 138
 139 (defun vc-sccs-checkout-model (file)
 140   "SCCS-specific version of `vc-checkout-model'."
 141   'locking)
 142
 143 (defun vc-sccs-workfile-unchanged-p (file)
 144   "SCCS-specific implementation of vc-workfile-unchanged-p."
 145   (zerop (apply 'vc-do-command nil 1 "vcdiff" (vc-name file)
 146                 (list "--brief" "-q"
 147                       (concat "-r" (vc-workfile-version file))))))
 148
 149 \f
 150 ;;;
 151 ;;; State-changing functions
 152 ;;;
 153
 154 (defun vc-sccs-register (file &optional rev comment)
 155   "Register FILE into the SCCS version-control system.
 156 REV is the optional revision number for the file.  COMMENT can be used
 157 to provide an initial description of FILE.
 158
 159 `vc-register-switches' and `vc-sccs-register-switches' are passed to
 160 the SCCS command (in that order).
 161
 162 Automatically retrieve a read-only version of the file with keywords
 163 expanded if `vc-keep-workfiles' is non-nil, otherwise, delete the workfile."
 164     (let* ((switches (append
 165                      (if (stringp vc-register-switches)
 166                          (list vc-register-switches)
 167                        vc-register-switches)
 168                      (if (stringp vc-sccs-register-switches)
 169                          (list vc-sccs-register-switches)
 170                        vc-sccs-register-switches)))
 171            (dirname (or (file-name-directory file) ""))
 172            (basename (file-name-nondirectory file))
 173            (project-file (vc-sccs-search-project-dir dirname basename)))
 174       (let ((vc-name
 175              (or project-file
 176                  (format (car vc-sccs-master-templates) dirname basename)))|)
 177         (apply 'vc-do-command nil 0 "admin" vc-name
 178                (and rev (concat "-r" rev))
 179                "-fb"
 180                (concat "-i" (file-relative-name file))
 181                (and comment (concat "-y" comment))
 182                switches))
 183       (delete-file file)
 184       (if vc-keep-workfiles
 185           (vc-do-command nil 0 "get" (vc-name file)))))
 186
 187 (defun vc-sccs-responsible-p (file)
 188   "Return non-nil if SCCS thinks it would be responsible for registering FILE."
 189   ;; TODO: check for all the patterns in vc-sccs-master-templates
 190   (or (file-directory-p (expand-file-name "SCCS" (file-name-directory file)))
 191       (stringp (vc-sccs-search-project-dir (or (file-name-directory file) "")
 192                                            (file-name-nondirectory file)))))
 193
 194 (defun vc-sccs-checkin (file rev comment)
 195   "SCCS-specific version of `vc-backend-checkin'."
 196   (let ((switches (if (stringp vc-checkin-switches)
 197                       (list vc-checkin-switches)
 198                     vc-checkin-switches)))
 199     (apply 'vc-do-command nil 0 "delta" (vc-name file)
 200            (if rev (concat "-r" rev))
 201            (concat "-y" comment)
 202            switches)
 203     (if vc-keep-workfiles
 204         (vc-do-command nil 0 "get" (vc-name file)))))
 205
 206 (defun vc-sccs-find-version (file rev buffer)
 207   (apply 'vc-do-command
 208          buffer 0 "get" (vc-name file)
 209          "-s" ;; suppress diagnostic output
 210          "-p"
 211          (and rev
 212               (concat "-r"
 213                       (vc-sccs-lookup-triple file rev)))
 214          (if (stringp vc-checkout-switches)
 215              (list vc-checkout-switches)
 216            vc-checkout-switches)))
 217
 218 (defun vc-sccs-checkout (file &optional editable rev)
 219   "Retrieve a copy of a saved version of SCCS controlled FILE.
 220 EDITABLE non-nil means that the file should be writable and
 221 locked.  REV is the revision to check out."
 222   (let ((file-buffer (get-file-buffer file))
 223         switches)
 224     (message "Checking out %s..." file)
 225     (save-excursion
 226       ;; Change buffers to get local value of vc-checkout-switches.
 227       (if file-buffer (set-buffer file-buffer))
 228       (setq switches (if (stringp vc-checkout-switches)
 229                          (list vc-checkout-switches)
 230                        vc-checkout-switches))
 231       ;; Save this buffer's default-directory
 232       ;; and use save-excursion to make sure it is restored
 233       ;; in the same buffer it was saved in.
 234       (let ((default-directory default-directory))
 235         (save-excursion
 236           ;; Adjust the default-directory so that the check-out creates
 237           ;; the file in the right place.
 238           (setq default-directory (file-name-directory file))
 239
 240           (and rev (string= rev "") (setq rev nil))
 241           (apply 'vc-do-command nil 0 "get" (vc-name file)
 242                  (if editable "-e")
 243                  (and rev (concat "-r" (vc-sccs-lookup-triple file rev)))
 244                  switches))))
 245     (message "Checking out %s...done" file)))
 246
 247 (defun vc-sccs-revert (file &optional contents-done)
 248   "Revert FILE to the version it was based on."
 249   (vc-do-command nil 0 "unget" (vc-name file))
 250   (vc-do-command nil 0 "get" (vc-name file))
 251   ;; Checking out explicit versions is not supported under SCCS, yet.
 252   ;; We always "revert" to the latest version; therefore
 253   ;; vc-workfile-version is cleared here so that it gets recomputed.
 254   (vc-file-setprop file 'vc-workfile-version nil))
 255
 256 (defun vc-sccs-cancel-version (file editable)
 257   "Undo the most recent checkin of FILE.
 258 EDITABLE non-nil means previous version should be locked."
 259   (vc-do-command nil 0 "rmdel"
 260                  (vc-name file)
 261                  (concat "-r" (vc-workfile-version file)))
 262   (vc-do-command nil 0 "get"
 263                  (vc-name file)
 264                  (if editable "-e")))
 265
 266 (defun vc-sccs-steal-lock (file &optional rev)
 267   "Steal the lock on the current workfile for FILE and revision REV."
 268   (vc-do-command nil 0 "unget" (vc-name file) "-n" (if rev (concat "-r" rev)))
 269   (vc-do-command nil 0 "get" (vc-name file) "-g" (if rev (concat "-r" rev))))
 270
 271 \f
 272 ;;;
 273 ;;; History functions
 274 ;;;
 275
 276 (defun vc-sccs-print-log (file)
 277   "Get change log associated with FILE."
 278   (vc-do-command nil 0 "prs" (vc-name file)))
 279
 280 (defun vc-sccs-logentry-check ()
 281   "Check that the log entry in the current buffer is acceptable for SCCS."
 282   (when (>= (buffer-size) 512)
 283     (goto-char 512)
 284     (error "Log must be less than 512 characters; point is now at pos 512")))
 285
 286 (defun vc-sccs-diff (file &optional oldvers newvers)
 287   "Get a difference report using SCCS between two versions of FILE."
 288   (setq oldvers (vc-sccs-lookup-triple file oldvers))
 289   (setq newvers (vc-sccs-lookup-triple file newvers))
 290   (apply 'vc-do-command "*vc-diff*" 1 "vcdiff" (vc-name file)
 291          (append (list "-q"
 292                        (and oldvers (concat "-r" oldvers))
 293                        (and newvers (concat "-r" newvers)))
 294                  (vc-diff-switches-list 'SCCS))))
 295
 296 \f
 297 ;;;
 298 ;;; Snapshot system
 299 ;;;
 300
 301 (defun vc-sccs-assign-name (file name)
 302   "Assign to FILE's latest version a given NAME."
 303   (vc-sccs-add-triple name file (vc-workfile-version file)))
 304
 305 \f
 306 ;;;
 307 ;;; Miscellaneous
 308 ;;;
 309
 310 (defun vc-sccs-check-headers ()
 311   "Check if the current file has any headers in it."
 312   (save-excursion
 313     (goto-char (point-min))
 314     (re-search-forward  "%[A-Z]%" nil t)))
 315
 316 (defun vc-sccs-rename-file (old new)
 317   ;; Move the master file (using vc-rcs-master-templates).
 318   (vc-rename-master (vc-name old) new vc-sccs-master-templates)
 319   ;; Update the snapshot file.
 320   (with-current-buffer
 321       (find-file-noselect
 322        (expand-file-name vc-sccs-name-assoc-file
 323                          (file-name-directory (vc-name old))))
 324     (goto-char (point-min))
 325     ;; (replace-regexp (concat ":" (regexp-quote old) "$") (concat ":" new))
 326     (while (re-search-forward (concat ":" (regexp-quote old) "$") nil t)
 327       (replace-match (concat ":" new) nil nil))
 328     (basic-save-buffer)
 329     (kill-buffer (current-buffer))))
 330
 331 \f
 332 ;;;
 333 ;;; Internal functions
 334 ;;;
 335
 336 ;; This function is wrapped with `progn' so that the autoload cookie
 337 ;; copies the whole function itself into loaddefs.el rather than just placing
 338 ;; a (autoload 'vc-sccs-search-project-dir "vc-sccs") which would not
 339 ;; help us avoid loading vc-sccs.
 340 ;;;###autoload
 341 (progn (defun vc-sccs-search-project-dir (dirname basename)
 342   "Return the name of a master file in the SCCS project directory.
 343 Does not check whether the file exists but returns nil if it does not
 344 find any project directory."
 345   (let ((project-dir (getenv "PROJECTDIR")) dirs dir)
 346     (when project-dir
 347       (if (file-name-absolute-p project-dir)
 348           (setq dirs '("SCCS" ""))
 349         (setq dirs '("src/SCCS" "src" "source/SCCS" "source"))
 350         (setq project-dir (expand-file-name (concat "~" project-dir))))
 351       (while (and (not dir) dirs)
 352         (setq dir (expand-file-name (car dirs) project-dir))
 353         (unless (file-directory-p dir)
 354           (setq dir nil)
 355           (setq dirs (cdr dirs))))
 356       (and dir (expand-file-name (concat "s." basename) dir))))))
 357
 358 (defun vc-sccs-lock-file (file)
 359   "Generate lock file name corresponding to FILE."
 360   (let ((master (vc-name file)))
 361     (and
 362      master
 363      (string-match "\\(.*/\\)\\(s\\.\\)\\(.*\\)" master)
 364      (replace-match "p." t t master 2))))
 365
 366 (defun vc-sccs-parse-locks ()
 367   "Parse SCCS locks in current buffer.
 368 The result is a list of the form ((VERSION . USER) (VERSION . USER) ...)."
 369   (let (master-locks)
 370     (goto-char (point-min))
 371     (while (re-search-forward "^\\([0-9.]+\\) [0-9.]+ \\([^ ]+\\) .*\n?"
 372                               nil t)
 373       (setq master-locks
 374             (cons (cons (match-string 1) (match-string 2)) master-locks)))
 375     ;; FIXME: is it really necessary to reverse ?
 376     (nreverse master-locks)))
 377
 378 (defun vc-sccs-add-triple (name file rev)
 379   (with-current-buffer
 380       (find-file-noselect
 381        (expand-file-name vc-sccs-name-assoc-file
 382                          (file-name-directory (vc-name file))))
 383     (goto-char (point-max))
 384     (insert name "\t:\t" file "\t" rev "\n")
 385     (basic-save-buffer)
 386     (kill-buffer (current-buffer))))
 387
 388 (defun vc-sccs-lookup-triple (file name)
 389   "Return the numeric version corresponding to a named snapshot of FILE.
 390 If NAME is nil or a version number string it's just passed through."
 391   (if (or (null name)
 392           (let ((firstchar (aref name 0)))
 393             (and (>= firstchar ?0) (<= firstchar ?9))))
 394       name
 395     (with-temp-buffer
 396       (vc-insert-file
 397        (expand-file-name vc-sccs-name-assoc-file
 398                          (file-name-directory (vc-name file))))
 399       (vc-parse-buffer (concat name "\t:\t" file "\t\\(.+\\)") 1))))
 400
 401 (provide 'vc-sccs)
 402
 403 ;;; vc-sccs.el ends here