vc / vc-sccs.el

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
;;; 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 Free Software Foundation, Inc.

;; Author:     FSF (see vc.el for full credits)
;; Maintainer: Andre Spiegel <spiegel@gnu.org>

;; $Id$

;; 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, 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
;;;

;;; 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."
  (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 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.
      ;; XEmacs change: no 2nd arg to `file-attributes'
      (let* ((attributes  (file-attributes file))
             (owner-uid   (nth 2 attributes))
             (owner-name  (or (user-login-name owner-uid)
                              (number-to-string owner-uid)))
             (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-workfile-version (file)
  "SCCS-specific version of `vc-workfile-version'."
  (with-temp-buffer
    ;; The workfile version is always the latest version 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") version.
    (vc-insert-file (vc-name file) "^\001e\n\001[^s]")
    (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* ((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))
	       (vc-switches 'SCCS 'register)))
      (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'."
  (apply 'vc-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-do-command nil 0 "get" (vc-name file))))

(defun vc-sccs-find-version (file rev buffer)
  (apply 'vc-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 version of SCCS controlled FILE.
EDITABLE non-nil means that the file should be writable and
locked.  REV is the revision to check out."
  (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-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-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 &optional buffer)
  "Get change log associated with FILE."
  (vc-do-command buffer 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 buffer)
  "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 (or buffer "*vc-diff*") 1 "vcdiff" (vc-name file)
         (append (list "-q"
                       (and oldvers (concat "-r" oldvers))
                       (and newvers (concat "-r" newvers)))
                 (vc-switches 'SCCS 'diff))))


;;;
;;; 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)
     ;; XEmacs change: don't use replace-match here; our API differs from GNU
     (concat (match-string 1 master) "p." (match-string 3 master)))))

(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)

;; arch-tag: d751dee3-d7b3-47e1-95e3-7ae98c052041
;;; vc-sccs.el ends here
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.