lisp/vc-sccs.el

   1 ;;; vc-sccs.el --- support for SCCS version-control
   2
   3 ;; Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   4 ;;   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Author:     FSF (see vc.el for full credits)
   7 ;; Maintainer: Andre Spiegel <spiegel@gnu.org>
   8
   9 ;; $Id$
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software; you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation; either version 3, or (at your option)
  16 ;; any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  25 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  26 ;; Boston, MA 02110-1301, USA.
  27
  28 ;;; Commentary:
  29
  30 ;;; Code:
  31
  32 (eval-when-compile
  33   (require 'vc))
  34
  35 ;;;
  36 ;;; Customization options
  37 ;;;
  38
  39 (defcustom vc-sccs-register-switches nil
  40   "*Extra switches for registering a file in SCCS.
  41 A string or list of strings passed to the checkin program by
  42 \\[vc-sccs-register]."
  43   :type '(choice (const :tag "None" nil)
  44                  (string :tag "Argument String")
  45                  (repeat :tag "Argument List"
  46                          :value ("")
  47                          string))
  48   :version "21.1"
  49   :group 'vc)
  50
  51 (defcustom vc-sccs-diff-switches nil
  52   "*A string or list of strings specifying extra switches for `vcdiff',
  53 the diff utility used for SCCS under VC."
  54     :type '(choice (const :tag "None" nil)
  55                  (string :tag "Argument String")
  56                  (repeat :tag "Argument List"
  57                          :value ("")
  58                          string))
  59   :version "21.1"
  60   :group 'vc)
  61
  62 (defcustom vc-sccs-header (or (cdr (assoc 'SCCS vc-header-alist)) '("%W%"))
  63   "*Header keywords to be inserted by `vc-insert-headers'."
  64   :type '(repeat string)
  65   :group 'vc)
  66
  67 ;;;###autoload
  68 (defcustom vc-sccs-master-templates
  69   '("%sSCCS/s.%s" "%ss.%s" vc-sccs-search-project-dir)
  70   "*Where to look for SCCS master files.
  71 For a description of possible values, see `vc-check-master-templates'."
  72   :type '(choice (const :tag "Use standard SCCS file names"
  73                         ("%sSCCS/s.%s" "%ss.%s" vc-sccs-search-project-dir))
  74                  (repeat :tag "User-specified"
  75                          (choice string
  76                                  function)))
  77   :version "21.1"
  78   :group 'vc)
  79
  80 \f
  81 ;;;
  82 ;;; Internal variables
  83 ;;;
  84
  85 (defconst vc-sccs-name-assoc-file "VC-names")
  86
  87 \f
  88 ;;;
  89 ;;; State-querying functions
  90 ;;;
  91
  92 ;;; The autoload cookie below places vc-sccs-registered directly into
  93 ;;; loaddefs.el, so that vc-sccs.el does not need to be loaded for
  94 ;;; every file that is visited.  The definition is repeated below
  95 ;;; so that Help and etags can find it.
  96
  97 ;;;###autoload (defun vc-sccs-registered(f) (vc-default-registered 'SCCS f))
  98 (defun vc-sccs-registered (f) (vc-default-registered 'SCCS f))
  99
 100 (defun vc-sccs-state (file)
 101   "SCCS-specific function to compute the version control state."
 102   (with-temp-buffer
 103     (if (vc-insert-file (vc-sccs-lock-file file))
 104         (let* ((locks (vc-sccs-parse-locks))
 105                (workfile-version (vc-workfile-version file))
 106                (locking-user (cdr (assoc workfile-version locks))))
 107           (if (not locking-user)
 108               (if (vc-workfile-unchanged-p file)
 109                   'up-to-date
 110                 'unlocked-changes)
 111             (if (string= locking-user (vc-user-login-name file))
 112                 'edited
 113               locking-user)))
 114       'up-to-date)))
 115
 116 (defun vc-sccs-state-heuristic (file)
 117   "SCCS-specific state heuristic."
 118   (if (not (vc-mistrust-permissions file))
 119       ;;   This implementation assumes that any file which is under version
 120       ;; control and has -rw-r--r-- is locked by its owner.  This is true
 121       ;; for both RCS and SCCS, which keep unlocked files at -r--r--r--.
 122       ;; We have to be careful not to exclude files with execute bits on;
 123       ;; scripts can be under version control too.  Also, we must ignore the
 124       ;; group-read and other-read bits, since paranoid users turn them off.
 125       (let* ((attributes  (file-attributes file 'string))
 126              (owner-name  (nth 2 attributes))
 127              (permissions (nth 8 attributes)))
 128         (if (string-match ".r-..-..-." permissions)
 129             'up-to-date
 130           (if (string-match ".rw..-..-." permissions)
 131               (if (file-ownership-preserved-p file)
 132                   'edited
 133                 owner-name)
 134             ;; Strange permissions.
 135             ;; Fall through to real state computation.
 136             (vc-sccs-state file))))
 137     (vc-sccs-state file)))
 138
 139 (defun vc-sccs-workfile-version (file)
 140   "SCCS-specific version of `vc-workfile-version'."
 141   (with-temp-buffer
 142     ;; The workfile version is always the latest version number.
 143     ;; To find this number, search the entire delta table,
 144     ;; rather than just the first entry, because the
 145     ;; first entry might be a deleted ("R") version.
 146     (vc-insert-file (vc-name file) "^\001e\n\001[^s]")
 147     (vc-parse-buffer "^\001d D \\([^ ]+\\)" 1)))
 148
 149 (defun vc-sccs-checkout-model (file)
 150   "SCCS-specific version of `vc-checkout-model'."
 151   'locking)
 152
 153 (defun vc-sccs-workfile-unchanged-p (file)
 154   "SCCS-specific implementation of `vc-workfile-unchanged-p'."
 155   (zerop (apply 'vc-do-command nil 1 "vcdiff" (vc-name file)
 156                 (list "--brief" "-q"
 157                       (concat "-r" (vc-workfile-version file))))))
 158
 159 \f
 160 ;;;
 161 ;;; State-changing functions
 162 ;;;
 163
 164 (defun vc-sccs-register (file &optional rev comment)
 165   "Register FILE into the SCCS version-control system.
 166 REV is the optional revision number for the file.  COMMENT can be used
 167 to provide an initial description of FILE.
 168
 169 `vc-register-switches' and `vc-sccs-register-switches' are passed to
 170 the SCCS command (in that order).
 171
 172 Automatically retrieve a read-only version of the file with keywords
 173 expanded if `vc-keep-workfiles' is non-nil, otherwise, delete the workfile."
 174     (let* ((dirname (or (file-name-directory file) ""))
 175            (basename (file-name-nondirectory file))
 176            (project-file (vc-sccs-search-project-dir dirname basename)))
 177       (let ((vc-name
 178              (or project-file
 179                  (format (car vc-sccs-master-templates) dirname basename))))
 180         (apply 'vc-do-command nil 0 "admin" vc-name
 181                (and rev (concat "-r" rev))
 182                "-fb"
 183                (concat "-i" (file-relative-name file))
 184                (and comment (concat "-y" comment))
 185                (vc-switches 'SCCS 'register)))
 186       (delete-file file)
 187       (if vc-keep-workfiles
 188           (vc-do-command nil 0 "get" (vc-name file)))))
 189
 190 (defun vc-sccs-responsible-p (file)
 191   "Return non-nil if SCCS thinks it would be responsible for registering FILE."
 192   ;; TODO: check for all the patterns in vc-sccs-master-templates
 193   (or (file-directory-p (expand-file-name "SCCS" (file-name-directory file)))
 194       (stringp (vc-sccs-search-project-dir (or (file-name-directory file) "")
 195                                            (file-name-nondirectory file)))))
 196
 197 (defun vc-sccs-checkin (file rev comment)
 198   "SCCS-specific version of `vc-backend-checkin'."
 199   (apply 'vc-do-command nil 0 "delta" (vc-name file)
 200          (if rev (concat "-r" rev))
 201          (concat "-y" comment)
 202          (vc-switches 'SCCS 'checkin))
 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          (vc-switches 'SCCS 'checkout)))
 215
 216 (defun vc-sccs-checkout (file &optional editable rev)
 217   "Retrieve a copy of a saved version of SCCS controlled FILE.
 218 EDITABLE non-nil means that the file should be writable and
 219 locked.  REV is the revision to check out."
 220   (let ((file-buffer (get-file-buffer file))
 221         switches)
 222     (message "Checking out %s..." file)
 223     (save-excursion
 224       ;; Change buffers to get local value of vc-checkout-switches.
 225       (if file-buffer (set-buffer file-buffer))
 226       (setq switches (vc-switches 'SCCS 'checkout))
 227       ;; Save this buffer's default-directory
 228       ;; and use save-excursion to make sure it is restored
 229       ;; in the same buffer it was saved in.
 230       (let ((default-directory default-directory))
 231         (save-excursion
 232           ;; Adjust the default-directory so that the check-out creates
 233           ;; the file in the right place.
 234           (setq default-directory (file-name-directory file))
 235
 236           (and rev (or (string= rev "")
 237                        (not (stringp rev)))
 238                (setq rev nil))
 239           (apply 'vc-do-command nil 0 "get" (vc-name file)
 240                  (if editable "-e")
 241                  (and rev (concat "-r" (vc-sccs-lookup-triple file rev)))
 242                  switches))))
 243     (message "Checking out %s...done" file)))
 244
 245 (defun vc-sccs-revert (file &optional contents-done)
 246   "Revert FILE to the version it was based on."
 247   (vc-do-command nil 0 "unget" (vc-name file))
 248   (vc-do-command nil 0 "get" (vc-name file))
 249   ;; Checking out explicit versions is not supported under SCCS, yet.
 250   ;; We always "revert" to the latest version; therefore
 251   ;; vc-workfile-version is cleared here so that it gets recomputed.
 252   (vc-file-setprop file 'vc-workfile-version nil))
 253
 254 (defun vc-sccs-cancel-version (file editable)
 255   "Undo the most recent checkin of FILE.
 256 EDITABLE non-nil means previous version should be locked."
 257   (vc-do-command nil 0 "rmdel"
 258                  (vc-name file)
 259                  (concat "-r" (vc-workfile-version file)))
 260   (vc-do-command nil 0 "get"
 261                  (vc-name file)
 262                  (if editable "-e")))
 263
 264 (defun vc-sccs-steal-lock (file &optional rev)
 265   "Steal the lock on the current workfile for FILE and revision REV."
 266   (vc-do-command nil 0 "unget" (vc-name file) "-n" (if rev (concat "-r" rev)))
 267   (vc-do-command nil 0 "get" (vc-name file) "-g" (if rev (concat "-r" rev))))
 268
 269 \f
 270 ;;;
 271 ;;; History functions
 272 ;;;
 273
 274 (defun vc-sccs-print-log (file &optional buffer)
 275   "Get change log associated with FILE."
 276   (vc-do-command buffer 0 "prs" (vc-name file)))
 277
 278 (defun vc-sccs-logentry-check ()
 279   "Check that the log entry in the current buffer is acceptable for SCCS."
 280   (when (>= (buffer-size) 512)
 281     (goto-char 512)
 282     (error "Log must be less than 512 characters; point is now at pos 512")))
 283
 284 (defun vc-sccs-diff (file &optional oldvers newvers buffer)
 285   "Get a difference report using SCCS between two versions of FILE."
 286   (setq oldvers (vc-sccs-lookup-triple file oldvers))
 287   (setq newvers (vc-sccs-lookup-triple file newvers))
 288   (apply 'vc-do-command (or buffer "*vc-diff*") 1 "vcdiff" (vc-name file)
 289          (append (list "-q"
 290                        (and oldvers (concat "-r" oldvers))
 291                        (and newvers (concat "-r" newvers)))
 292                  (vc-switches 'SCCS 'diff))))
 293
 294 \f
 295 ;;;
 296 ;;; Snapshot system
 297 ;;;
 298
 299 (defun vc-sccs-assign-name (file name)
 300   "Assign to FILE's latest version a given NAME."
 301   (vc-sccs-add-triple name file (vc-workfile-version file)))
 302
 303 \f
 304 ;;;
 305 ;;; Miscellaneous
 306 ;;;
 307
 308 (defun vc-sccs-check-headers ()
 309   "Check if the current file has any headers in it."
 310   (save-excursion
 311     (goto-char (point-min))
 312     (re-search-forward  "%[A-Z]%" nil t)))
 313
 314 (defun vc-sccs-rename-file (old new)
 315   ;; Move the master file (using vc-rcs-master-templates).
 316   (vc-rename-master (vc-name old) new vc-sccs-master-templates)
 317   ;; Update the snapshot file.
 318   (with-current-buffer
 319       (find-file-noselect
 320        (expand-file-name vc-sccs-name-assoc-file
 321                          (file-name-directory (vc-name old))))
 322     (goto-char (point-min))
 323     ;; (replace-regexp (concat ":" (regexp-quote old) "$") (concat ":" new))
 324     (while (re-search-forward (concat ":" (regexp-quote old) "$") nil t)
 325       (replace-match (concat ":" new) nil nil))
 326     (basic-save-buffer)
 327     (kill-buffer (current-buffer))))
 328
 329 \f
 330 ;;;
 331 ;;; Internal functions
 332 ;;;
 333
 334 ;; This function is wrapped with `progn' so that the autoload cookie
 335 ;; copies the whole function itself into loaddefs.el rather than just placing
 336 ;; a (autoload 'vc-sccs-search-project-dir "vc-sccs") which would not
 337 ;; help us avoid loading vc-sccs.
 338 ;;;###autoload
 339 (progn (defun vc-sccs-search-project-dir (dirname basename)
 340   "Return the name of a master file in the SCCS project directory.
 341 Does not check whether the file exists but returns nil if it does not
 342 find any project directory."
 343   (let ((project-dir (getenv "PROJECTDIR")) dirs dir)
 344     (when project-dir
 345       (if (file-name-absolute-p project-dir)
 346           (setq dirs '("SCCS" ""))
 347         (setq dirs '("src/SCCS" "src" "source/SCCS" "source"))
 348         (setq project-dir (expand-file-name (concat "~" project-dir))))
 349       (while (and (not dir) dirs)
 350         (setq dir (expand-file-name (car dirs) project-dir))
 351         (unless (file-directory-p dir)
 352           (setq dir nil)
 353           (setq dirs (cdr dirs))))
 354       (and dir (expand-file-name (concat "s." basename) dir))))))
 355
 356 (defun vc-sccs-lock-file (file)
 357   "Generate lock file name corresponding to FILE."
 358   (let ((master (vc-name file)))
 359     (and
 360      master
 361      (string-match "\\(.*/\\)\\(s\\.\\)\\(.*\\)" master)
 362      (replace-match "p." t t master 2))))
 363
 364 (defun vc-sccs-parse-locks ()
 365   "Parse SCCS locks in current buffer.
 366 The result is a list of the form ((VERSION . USER) (VERSION . USER) ...)."
 367   (let (master-locks)
 368     (goto-char (point-min))
 369     (while (re-search-forward "^\\([0-9.]+\\) [0-9.]+ \\([^ ]+\\) .*\n?"
 370                               nil t)
 371       (setq master-locks
 372             (cons (cons (match-string 1) (match-string 2)) master-locks)))
 373     ;; FIXME: is it really necessary to reverse ?
 374     (nreverse master-locks)))
 375
 376 (defun vc-sccs-add-triple (name file rev)
 377   (with-current-buffer
 378       (find-file-noselect
 379        (expand-file-name vc-sccs-name-assoc-file
 380                          (file-name-directory (vc-name file))))
 381     (goto-char (point-max))
 382     (insert name "\t:\t" file "\t" rev "\n")
 383     (basic-save-buffer)
 384     (kill-buffer (current-buffer))))
 385
 386 (defun vc-sccs-lookup-triple (file name)
 387   "Return the numeric version corresponding to a named snapshot of FILE.
 388 If NAME is nil or a version number string it's just passed through."
 389   (if (or (null name)
 390           (let ((firstchar (aref name 0)))
 391             (and (>= firstchar ?0) (<= firstchar ?9))))
 392       name
 393     (with-temp-buffer
 394       (vc-insert-file
 395        (expand-file-name vc-sccs-name-assoc-file
 396                          (file-name-directory (vc-name file))))
 397       (vc-parse-buffer (concat name "\t:\t" file "\t\\(.+\\)") 1))))
 398
 399 (provide 'vc-sccs)
 400
 401 ;; arch-tag: d751dee3-d7b3-47e1-95e3-7ae98c052041
 402 ;;; vc-sccs.el ends here