vc.el 120 KB
Newer Older
Eric S. Raymond's avatar
Eric S. Raymond committed
1 2
;;; vc.el --- drive a version-control system from within Emacs

3
;; Copyright (C) 1992,93,94,95,96,97,98,2000  Free Software Foundation, Inc.
Eric S. Raymond's avatar
Eric S. Raymond committed
4

5 6
;; Author:     FSF (see below for full credits)
;; Maintainer: Andre Spiegel <spiegel@gnu.org>
Eric S. Raymond's avatar
Eric S. Raymond committed
7

8 9
;; $Id$

Eric S. Raymond's avatar
Eric S. Raymond committed
10 11 12 13 14 15 16 17 18 19 20 21 22
;; 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
Erik Naggum's avatar
Erik Naggum committed
23 24 25
;; 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.
Eric S. Raymond's avatar
Eric S. Raymond committed
26

27 28 29 30 31 32 33 34 35
;;; Credits:

;; VC was initially designed and implemented by Eric S. Raymond
;; <esr@snark.thyrsus.com>.  Over the years, many people have
;; contributed substantial amounts of work to VC.  These include:
;;   Per Cederqvist <ceder@lysator.liu.se>
;;   Paul Eggert <eggert@twinsun.com>
;;   Sebastian Kremer <sk@thp.uni-koeln.de>
;;   Martin Lorentzson <martinl@gnu.org>
36
;;   Dave Love <d.love@gnu.org>
37 38 39 40 41
;;   Stefan Monnier <monnier@cs.yale.edu>
;;   Andre Spiegel <spiegel@gnu.org>
;;   Richard Stallman <rms@gnu.org>
;;   ttn@netcom.com

Eric S. Raymond's avatar
Eric S. Raymond committed
42 43
;;; Commentary:

44 45
;; This mode is fully documented in the Emacs user's manual.
;;
46
;; Supported version-control systems presently include SCCS, RCS, and CVS.
47 48 49
;;
;; Some features will not work with old RCS versions.  Where
;; appropriate, VC finds out which version you have, and allows or
50
;; disallows those features (stealing locks, for example, works only
51
;; from 5.6.2 onwards).
52 53
;; Even initial checkins will fail if your RCS version is so old that ci
;; doesn't understand -t-; this has been known to happen to people running
54
;; NExTSTEP 3.0.
Eric S. Raymond's avatar
Eric S. Raymond committed
55
;;
56
;; You can support the RCS -x option by customizing vc-rcs-master-templates.
Eric S. Raymond's avatar
Eric S. Raymond committed
57 58 59 60
;;
;; Proper function of the SCCS diff commands requires the shellscript vcdiff
;; to be installed somewhere on Emacs's path for executables.
;;
61
;; If your site uses the ChangeLog convention supported by Emacs, the
62
;; function vc-comment-to-change-log should prove a useful checkin hook.
63
;;
Eric S. Raymond's avatar
Eric S. Raymond committed
64 65
;; The vc code maintains some internal state in order to reduce expensive
;; version-control operations to a minimum.  Some names are only computed
66
;; once.  If you perform version control operations with RCS/SCCS/CVS while
Eric S. Raymond's avatar
Eric S. Raymond committed
67 68 69 70 71 72 73 74
;; vc's back is turned, or move/rename master files while vc is running,
;; vc may get seriously confused.  Don't do these things!
;;
;; Developer's notes on some concurrency issues are included at the end of
;; the file.

;;; Code:

75 76 77
;;;;;;;;;;;;;;;;; Backend-specific functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; for each operation FUN, the backend should provide a function vc-BACKEND-FUN.
78
;; Operations marked with a `-' instead of a `*' are optional.
79 80 81 82 83 84 85 86 87 88

;; * registered (file)
;; * state (file)
;; - state-heuristic (file)
;;     The default behavior delegates to `state'.
;; - dir-state (dir)
;; * checkout-model (file)
;; - mode-line-string (file)
;; * workfile-version (file)
;; * revert (file)
89 90 91 92 93
;; - merge-news (file)
;;     Only needed if state `needs-merge' is possible.
;; - merge (file rev1 rev2)
;; - steal-lock (file &optional version)
;;     Only required if files can be locked by somebody else.
94
;; * register (file rev comment)
95 96
;; * unregister (file backend)
;; - receive-file (file move)
97
;; - responsible-p (file)
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
;;     Should also work if FILE is a directory (ends with a slash).
;; - could-register (file)
;; * checkout (file writable &optional rev destfile)
;;     Checkout revision REV of FILE into DESTFILE.
;;     DESTFILE defaults to FILE.
;;     The file should be made writable if WRITABLE is non-nil.
;;     REV can be nil (BASE) or "" (HEAD) or any other revision.
;; * checkin (file rev comment)
;; - logentry-check ()
;; * diff (file &optional rev1 rev2)
;;     Insert the diff for FILE into the current buffer.
;;     REV1 should default to workfile-version.
;;     REV2 should default to the current workfile
;;     Return a status of either 0 (i.e. no diff) or 1 (i.e. either non-empty
;;     diff or the diff is run asynchronously).
;; - workfile-unchanged-p (file)
;;     Return non-nil if FILE is unchanged from its current workfile version.
;;     This function should do a brief comparison of FILE's contents
;;     with those of the master version.  If the backend does not have
;;     such a brief-comparison feature, the default implementation of this
;;     function can be used, which delegates to a full vc-BACKEND-diff.
;; - clear-headers ()
;; * check-headers ()
;; - dired-state-info (file)
;; - create-snapshot (dir name branchp)
;;     Take a snapshot of the current state of files under DIR and name it NAME.
;;     This should make sure that files are up-to-date before proceeding
;;     with the action.
;;     DIR can also be a file and if BRANCHP is specified, NAME
;;     should be created as a branch and DIR should be checked out under
;;     this new branch.  The default behavior does not support branches
;;     but does a sanity check, a tree traversal and for each file calls
;;     `assign-name'.
;; * assign-name (file name)
;;     Give name NAME to the current version of FILE, assuming it is
;;     up-to-date.  Only used by the default version of `create-snapshot'.
;; - retrieve-snapshot (dir name update)
;;     Retrieve a named snapshot of all registered files at or below DIR.
136
;;     If UPDATE is non-nil, then update buffers of any files in the snapshot
137 138 139 140
;;     that are currently visited.
;; * print-log (file)
;;     Insert the revision log of FILE into the current buffer.
;; - show-log-entry (version)
141
;; - comment-history (file)
142 143 144 145
;; - update-changelog (files)
;;     Find changelog entries for FILES, or for all files at or below
;;     the default-directory if FILES is nil.
;; * latest-on-branch-p (file)
146 147 148 149 150
;; - cancel-version (file writable)
;; - rename-file (old new)
;; - annotate-command (file buf)
;; - annotate-difference (pos)
;;     Only required if `annotate-command' is defined for the backend.
151

Eric S. Raymond's avatar
Eric S. Raymond committed
152
(require 'vc-hooks)
153
(require 'ring)
154
(eval-when-compile
155
  (require 'cl)
156 157 158
  (require 'compile)
  (require 'dired)      ; for dired-map-over-marks macro
  (require 'dired-aux))	; for dired-kill-{line,tree}
159 160 161 162 163

(if (not (assoc 'vc-parent-buffer minor-mode-alist))
    (setq minor-mode-alist
	  (cons '(vc-parent-buffer vc-parent-buffer-name)
		minor-mode-alist)))
Eric S. Raymond's avatar
Eric S. Raymond committed
164 165 166

;; General customization

167 168 169 170 171 172 173 174 175
(defgroup vc nil
  "Version-control system in Emacs."
  :group 'tools)

(defcustom vc-suppress-confirm nil
  "*If non-nil, treat user as expert; suppress yes-no prompts on some things."
  :type 'boolean
  :group 'vc)

176 177 178 179 180 181 182 183
(defcustom vc-delete-logbuf-window t
  "*If non-nil, delete the *VC-log* buffer and window after each logical action.
If nil, bury that buffer instead.
This is most useful if you have multiple windows on a frame and would like to
preserve the setting."
  :type 'boolean
  :group 'vc)

184 185 186 187 188
(defcustom vc-initial-comment nil
  "*If non-nil, prompt for initial comment when a file is registered."
  :type 'boolean
  :group 'vc)

189 190
(defcustom vc-default-init-version "1.1"
  "*A string used as the default version number when a new file is registered.
191
This can be overridden by giving a prefix argument to \\[vc-register]."
192
  :type 'string
Dan Nicolaescu's avatar
Dan Nicolaescu committed
193 194
  :group 'vc
  :version "20.3")
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
(defcustom vc-command-messages nil
  "*If non-nil, display run messages from back-end commands."
  :type 'boolean
  :group 'vc)

(defcustom vc-checkin-switches nil
  "*A string or list of strings specifying extra switches for checkin.
These are passed to the checkin program by \\[vc-checkin]."
  :type '(choice (const :tag "None" nil)
		 (string :tag "Argument String")
		 (repeat :tag "Argument List"
			 :value ("")
			 string))
  :group 'vc)

(defcustom vc-checkout-switches nil
  "*A string or list of strings specifying extra switches for checkout.
These are passed to the checkout program by \\[vc-checkout]."
  :type '(choice (const :tag "None" nil)
		 (string :tag "Argument String")
		 (repeat :tag "Argument List"
			 :value ("")
			 string))
  :group 'vc)

(defcustom vc-register-switches nil
  "*A string or list of strings; extra switches for registering a file.
These are passed to the checkin program by \\[vc-register]."
  :type '(choice (const :tag "None" nil)
		 (string :tag "Argument String")
		 (repeat :tag "Argument List"
			 :value ("")
			 string))
  :group 'vc)

231 232 233 234
(defcustom vc-dired-listing-switches "-al"
  "*Switches passed to `ls' for vc-dired.  MUST contain the `l' option."
  :type 'string
  :group 'vc
235
  :version "21.1")
236

237 238 239 240 241 242 243 244 245 246 247 248
(defcustom vc-dired-recurse t
  "*If non-nil, show directory trees recursively in VC Dired."
  :type 'boolean
  :group 'vc
  :version "20.3")

(defcustom vc-dired-terse-display t
  "*If non-nil, show only locked files in VC Dired."
  :type 'boolean
  :group 'vc
  :version "20.3")

249 250 251 252
(defcustom vc-directory-exclusion-list '("SCCS" "RCS" "CVS")
  "*List of directory names to be ignored while recursively walking file trees."
  :type '(repeat string)
  :group 'vc)
253

254 255 256
(defconst vc-maximum-comment-ring-size 32
  "Maximum number of saved comments in the comment ring.")

257 258
;;; This is duplicated in diff.el.
(defvar diff-switches "-c"
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281
  "*A string or list of strings specifying switches to be passed to diff.")

;;;###autoload
(defcustom vc-checkin-hook nil
  "*Normal hook (list of functions) run after a checkin is done.
See `run-hooks'."
  :type 'hook
  :options '(vc-comment-to-change-log)
  :group 'vc)

;;;###autoload
(defcustom vc-before-checkin-hook nil
  "*Normal hook (list of functions) run before a file gets checked in.
See `run-hooks'."
  :type 'hook
  :group 'vc)

(defcustom vc-logentry-check-hook nil
  "*Normal hook run by `vc-backend-logentry-check'.
Use this to impose your own rules on the entry in addition to any the
version control backend imposes itself."
  :type 'hook
  :group 'vc)
282

283
;; Annotate customization
284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
(defcustom vc-annotate-color-map
  '(( 26.3672 . "#FF0000")
    ( 52.7344 . "#FF3800")
    ( 79.1016 . "#FF7000")
    (105.4688 . "#FFA800")
    (131.8359 . "#FFE000")
    (158.2031 . "#E7FF00")
    (184.5703 . "#AFFF00")
    (210.9375 . "#77FF00")
    (237.3047 . "#3FFF00")
    (263.6719 . "#07FF00")
    (290.0391 . "#00FF31")
    (316.4063 . "#00FF69")
    (342.7734 . "#00FFA1")
    (369.1406 . "#00FFD9")
    (395.5078 . "#00EEFF")
    (421.8750 . "#00B6FF")
    (448.2422 . "#007EFF"))
  "*Association list of age versus color, for \\[vc-annotate].
Ages are given in units of 2**-16 seconds.
Default is eighteen steps using a twenty day increment."
305
  :type 'alist
306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321
  :group 'vc)

(defcustom vc-annotate-very-old-color "#0046FF"
  "*Color for lines older than CAR of last cons in `vc-annotate-color-map'."
  :type 'string
  :group 'vc)

(defcustom vc-annotate-background "black"
  "*Background color for \\[vc-annotate].
Default color is used if nil."
  :type 'string
  :group 'vc)

(defcustom vc-annotate-menu-elements '(2 0.5 0.1 0.01)
  "*Menu elements for the mode-specific menu of VC-Annotate mode.
List of factors, used to expand/compress the time scale.  See `vc-annotate'."
322
  :type '(repeat number)
323 324
  :group 'vc)

325 326 327
;; vc-annotate functionality (CVS only).
(defvar vc-annotate-mode nil
  "Variable indicating if VC-Annotate mode is active.")
328

329 330 331 332 333
(defvar vc-annotate-mode-map
  (let ((m (make-sparse-keymap)))
    (define-key m [menu-bar] (make-sparse-keymap "VC-Annotate"))
    m)
  "Local keymap used for VC-Annotate mode.")
334

335 336
(defvar vc-annotate-mode-menu nil
  "Local keymap used for VC-Annotate mode's menu bar menu.")
337

Eric S. Raymond's avatar
Eric S. Raymond committed
338 339
;; Header-insertion hair

340
(defcustom vc-static-header-alist
Eric S. Raymond's avatar
Eric S. Raymond committed
341 342
  '(("\\.c$" .
     "\n#ifndef lint\nstatic char vcid[] = \"\%s\";\n#endif /* lint */\n"))
343 344
  "*Associate static header string templates with file types.
A \%s in the template is replaced with the first string associated with
345
the file's version control type in `vc-header-alist'."
346 347 348 349
  :type '(repeat (cons :format "%v"
		       (regexp :tag "File Type")
		       (string :tag "Header String")))
  :group 'vc)
350

351
(defcustom vc-comment-alist
Eric S. Raymond's avatar
Eric S. Raymond committed
352 353
  '((nroff-mode ".\\\"" ""))
  "*Special comment delimiters to be used in generating vc headers only.
354 355
Add an entry in this list if you need to override the normal `comment-start'
and `comment-end' variables.  This will only be necessary if the mode language
356 357 358 359 360 361
is sensitive to blank lines."
  :type '(repeat (list :format "%v"
		       (symbol :tag "Mode")
		       (string :tag "Comment Start")
		       (string :tag "Comment End")))
  :group 'vc)
Eric S. Raymond's avatar
Eric S. Raymond committed
362

363
;; Default is to be extra careful for super-user.
364 365
;; TODO: This variable is no longer used; the corresponding checks
;;       are always done now.  If that turns out to be fast enough,
366
;;       the variable can be obsoleted.
367
(defcustom vc-checkout-carefully (= (user-uid) 0)
368 369
  "*Non-nil means be extra-careful in checkout.
Verify that the file really is not locked
370 371 372
and that its contents match what the master file says."
  :type 'boolean
  :group 'vc)
373

374 375 376 377 378 379

;;; The main keymap

(defvar vc-prefix-map
  (let ((map (make-sparse-keymap)))
    (define-key map "a" 'vc-update-change-log)
380
    (define-key map "b" 'vc-switch-backend)
381 382 383 384 385 386 387 388 389 390 391 392 393 394 395
    (define-key map "c" 'vc-cancel-version)
    (define-key map "d" 'vc-directory)
    (define-key map "g" 'vc-annotate)
    (define-key map "h" 'vc-insert-headers)
    (define-key map "i" 'vc-register)
    (define-key map "l" 'vc-print-log)
    (define-key map "m" 'vc-merge)
    (define-key map "r" 'vc-retrieve-snapshot)
    (define-key map "s" 'vc-create-snapshot)
    (define-key map "u" 'vc-revert-buffer)
    (define-key map "v" 'vc-next-action)
    (define-key map "=" 'vc-diff)
    (define-key map "~" 'vc-version-other-window)
    map))
(fset 'vc-prefix-map vc-prefix-map)
396

397 398 399 400 401 402 403 404 405 406 407
;; Initialization code, to be done just once at load-time
(defvar vc-log-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "\M-n" 'vc-next-comment)
    (define-key map "\M-p" 'vc-previous-comment)
    (define-key map "\M-r" 'vc-comment-search-reverse)
    (define-key map "\M-s" 'vc-comment-search-forward)
    (define-key map "\C-c\C-c" 'vc-finish-logentry)
    map))
;; Compatibility with old name.  Should we bother ?
(defvar vc-log-entry-mode vc-log-mode-map)
408

409

Eric S. Raymond's avatar
Eric S. Raymond committed
410 411
;; Variables the user doesn't need to know about.
(defvar vc-log-operation nil)
412
(defvar vc-log-after-operation-hook nil)
413
(defvar vc-annotate-buffers nil
414 415
  "Alist of current \"Annotate\" buffers and their corresponding backends.
The keys are \(BUFFER . BACKEND\).  See also `vc-annotate-get-backend'.")
Richard M. Stallman's avatar
Richard M. Stallman committed
416 417 418
;; In a log entry buffer, this is a local variable
;; that points to the buffer for which it was made
;; (either a file, or a VC dired buffer).
419
(defvar vc-parent-buffer nil)
420
(put 'vc-parent-buffer 'permanent-local t)
421
(defvar vc-parent-buffer-name nil)
422
(put 'vc-parent-buffer-name 'permanent-local t)
Eric S. Raymond's avatar
Eric S. Raymond committed
423

424 425 426
(defvar vc-log-file)
(defvar vc-log-version)

427
(defvar vc-dired-mode nil)
428 429
(make-variable-buffer-local 'vc-dired-mode)

430
(defvar vc-comment-ring (make-ring vc-maximum-comment-ring-size))
431
(defvar vc-comment-ring-index nil)
432
(defvar vc-last-comment-match "")
433

434 435 436
;;; functions that operate on RCS revision numbers.  This code should
;;; also be moved into the backends.  It stays for now, however, since
;;; it is used in code below.
437
(defun vc-trunk-p (rev)
438
  "Return t if REV is a revision on the trunk."
439 440
  (not (eq nil (string-match "\\`[0-9]+\\.[0-9]+\\'" rev))))

441
(defun vc-branch-p (rev)
442
  "Return t if REV is a branch revision."
443 444
  (not (eq nil (string-match "\\`[0-9]+\\(\\.[0-9]+\\.[0-9]+\\)*\\'" rev))))

445
(defun vc-branch-part (rev)
446
  "Return the branch part of a revision number REV."
447 448
  (substring rev 0 (string-match "\\.[0-9]+\\'" rev)))

449
(defun vc-minor-part (rev)
450
  "Return the minor version number of a revision number REV."
451 452 453 454
  (string-match "[0-9]+\\'" rev)
  (substring rev (match-beginning 0) (match-end 0)))

(defun vc-previous-version (rev)
455
  "Guess the version number immediately preceding REV."
456 457 458 459 460 461 462 463 464 465 466 467 468
  (let ((branch (vc-branch-part rev))
        (minor-num (string-to-number (vc-minor-part rev))))
    (if (> minor-num 1)
        ;; version does probably not start a branch or release
        (concat branch "." (number-to-string (1- minor-num)))
      (if (vc-trunk-p rev)
          ;; we are at the beginning of the trunk --
          ;; don't know anything to return here
          ""
        ;; we are at the beginning of a branch --
        ;; return version of starting point
        (vc-branch-part branch)))))

Eric S. Raymond's avatar
Eric S. Raymond committed
469 470
;; File property caching

471 472 473 474 475 476
(defun vc-clear-context ()
  "Clear all cached file properties and the comment ring."
  (interactive)
  (fillarray vc-file-prop-obarray nil)
  ;; Note: there is potential for minor lossage here if there is an open
  ;; log buffer with a nonzero local value of vc-comment-ring-index.
477
  (setq vc-comment-ring (make-ring vc-maximum-comment-ring-size)))
478

479 480 481 482 483 484 485 486 487 488 489 490 491 492 493
(defmacro with-vc-properties (file form settings)
  "Execute FORM, then set per-file properties for FILE, but only those
that have not been set during the execution of FORM.  SETTINGS is a list 
of two-element lists, each of which has the form (PROPERTY VALUE)."
  `(let ((vc-touched-properties (list t))
	 (filename ,file))
     ,form
     (mapcar (lambda (setting)
	       (let ((property (nth 0 setting))
		     (value (nth 1 setting)))
		 (unless (memq property vc-touched-properties)
		   (put (intern filename vc-file-prop-obarray) 
			property value))))
	     ,settings)))

Eric S. Raymond's avatar
Eric S. Raymond committed
494 495
;; Random helper functions

496 497
(defsubst vc-editable-p (file)
  (or (eq (vc-checkout-model file) 'implicit)
498
      (memq (vc-state file) '(edited needs-merge))))
499

500 501 502
;;; Two macros for elisp programming
;;;###autoload
(defmacro with-vc-file (file comment &rest body)
503 504 505 506
  "Check out a writable copy of FILE if necessary and execute the body.
Check in FILE with COMMENT (a string) after BODY has been executed.
FILE is passed through `expand-file-name'; BODY executed within
`save-excursion'.  If FILE is not under version control, or locked by
507 508
somebody else, signal error."
  `(let ((file (expand-file-name ,file)))
509
     (or (vc-backend file)
510
	 (error (format "File not under version control: `%s'" file)))
511 512 513 514
     (unless (vc-editable-p file)
       (let ((state (vc-state file)))
	 (if (stringp state) (error (format "`%s' is locking `%s'" state file))
	   (vc-checkout file t))))
515 516 517 518 519 520
     (save-excursion
       ,@body)
     (vc-checkin file nil ,comment)))

;;;###autoload
(defmacro edit-vc-file (file comment &rest body)
521 522
  "Edit FILE under version control, executing body.
Checkin with COMMENT after executing BODY.
523 524 525 526
This macro uses `with-vc-file', passing args to it.
However, before executing BODY, find FILE, and after BODY, save buffer."
  `(with-vc-file
    ,file ,comment
527
    (set-buffer (find-file-noselect ,file))
528 529 530
    ,@body
    (save-buffer)))

531
(defun vc-ensure-vc-buffer ()
532
  "Make sure that the current buffer visits a version-controlled file."
533 534 535 536 537 538 539 540
  (if vc-dired-mode
      (set-buffer (find-file-noselect (dired-get-filename)))
    (while vc-parent-buffer
      (pop-to-buffer vc-parent-buffer))
    (if (not (buffer-file-name))
	(error "Buffer %s is not associated with a file" (buffer-name))
      (if (not (vc-backend (buffer-file-name)))
	  (error "File %s is not under version control" (buffer-file-name))))))
541

Eric S. Raymond's avatar
Eric S. Raymond committed
542
(defvar vc-binary-assoc nil)
543 544 545 546
(defvar vc-binary-suffixes
  (if (memq system-type '(ms-dos windows-nt))
      '(".exe" ".com" ".bat" ".cmd" ".btm" "")
    '("")))
547 548

(defun vc-process-filter (p s)
549
  "An alternative output filter for async process P.
550 551 552 553 554 555 556 557 558
The only difference with the default filter is to insert S after markers."
  (with-current-buffer (process-buffer p)
    (save-excursion
      (let ((inhibit-read-only t))
	(goto-char (process-mark p))
	(insert s)
	(set-marker (process-mark p) (point))))))

(defun vc-setup-buffer (&optional buf)
559
  "Prepare BUF for executing a VC command and make it the current buffer.
560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591
BUF defaults to \"*vc*\", can be a string and will be created if necessary."
  (unless buf (setq buf "*vc*"))
  (let ((camefrom (current-buffer))
	(olddir default-directory))
    (set-buffer (get-buffer-create buf))
    (kill-all-local-variables)
    (set (make-local-variable 'vc-parent-buffer) camefrom)
    (set (make-local-variable 'vc-parent-buffer-name)
	 (concat " from " (buffer-name camefrom)))
    (setq default-directory olddir)
    (let ((inhibit-read-only t))
      (erase-buffer))))

(defun vc-exec-after (code)
  "Eval CODE when the current buffer's process is done.
If the current buffer has no process, just evaluate CODE.
Else, add CODE to the process' sentinel."
  (let ((proc (get-buffer-process (current-buffer))))
    (cond
     ;; If there's no background process, just execute the code.
     ((null proc) (eval code))
     ;; If the background process has exited, reap it and try again
     ((eq (process-status proc) 'exit)
      (delete-process proc)
      (vc-exec-after code))
     ;; If a process is running, add CODE to the sentinel
     ((eq (process-status proc) 'run)
      (let ((sentinel (process-sentinel proc)))
	(set-process-sentinel proc
	  `(lambda (p s)
	     (with-current-buffer ',(current-buffer)
	       (goto-char (process-mark p))
592
	       ,@(append (cdr (cdr (cdr ;strip off `with-current-buffer buf
593 594 595 596 597 598 599 600 601 602 603 604 605
                                        ;             (goto-char...)'
			   (car (cdr (cdr ;strip off `lambda (p s)'
			    sentinel))))))
			 (list `(vc-exec-after ',code))))))))
     (t (error "Unexpected process state"))))
  nil)

(defvar vc-post-command-functions nil
  "Hook run at the end of `vc-do-command'.
Each function is called inside the buffer in which the command was run
and is passed 3 argument: the COMMAND, the FILE and the FLAGS.")

(defun vc-do-command (buffer okstatus command file &rest flags)
606
  "Execute a version control command, notifying user and checking for errors.
607 608
Output from COMMAND goes to BUFFER, or *vc* if BUFFER is nil or the current
buffer (which is assumed to be properly setup) if BUFFER is t.  The
609
command is considered successful if its exit status does not exceed
610 611
OKSTATUS (if OKSTATUS is nil, that means to ignore errors, if it is 'async,
that means not to wait for termination of the subprocess).  FILE is
612
the name of the working file (may also be nil, to execute commands
613
that don't expect a file name).  If an optional list of FLAGS is present,
614
that is inserted into the command line before the filename."
615
  (and file (setq file (expand-file-name file)))
Eric S. Raymond's avatar
Eric S. Raymond committed
616
  (if vc-command-messages
617
      (message "Running %s on %s..." command file))
618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656
  (save-current-buffer
    (unless (eq buffer t) (vc-setup-buffer buffer))
    (let ((squeezed nil)
	  (inhibit-read-only t)
	  (status 0))
      (setq squeezed (delq nil (copy-sequence flags)))
      (when file
	;; FIXME: file-relative-name can return a bogus result because
	;; it doesn't look at the actual file-system to see if symlinks
	;; come into play.
	(setq squeezed (append squeezed (list (file-relative-name file)))))
      (let ((exec-path (append vc-path exec-path))
	    ;; Add vc-path to PATH for the execution of this command.
	    (process-environment
	     (cons (concat "PATH=" (getenv "PATH")
			   path-separator
			   (mapconcat 'identity vc-path path-separator))
		   process-environment))
	    (w32-quote-process-args t))
	(if (eq okstatus 'async)
	    (let ((proc (apply 'start-process command (current-buffer) command
			       squeezed)))
	      (message "Running %s in the background..." command)
	      ;;(set-process-sentinel proc (lambda (p msg) (delete-process p)))
	      (set-process-filter proc 'vc-process-filter)
	      (vc-exec-after
	       `(message "Running %s in the background... done" ',command)))
	  (setq status (apply 'call-process command nil t nil squeezed))
	  (when (or (not (integerp status)) (and okstatus (< okstatus status)))
	    (pop-to-buffer (current-buffer))
	    (goto-char (point-min))
	    (shrink-window-if-larger-than-buffer)
	    (error "Running %s...FAILED (%s)" command
		   (if (integerp status) (format "status %d" status) status))))
	(if vc-command-messages
	    (message "Running %s...OK" command)))
      (vc-exec-after
       `(run-hook-with-args 'vc-post-command-functions ',command ',file ',flags))
      status)))
Eric S. Raymond's avatar
Eric S. Raymond committed
657

658
(defun vc-position-context (posn)
659 660 661
  "Save a bit of the text around POSN in the current buffer.
Used to help us find the corresponding position again later
if markers are destroyed or corrupted."
662 663
  ;; A lot of this was shamelessly lifted from Sebastian Kremer's
  ;; rcs.el mode.
664 665 666 667 668 669
  (list posn
	(buffer-size)
	(buffer-substring posn
			  (min (point-max) (+ posn 100)))))

(defun vc-find-position-by-context (context)
670
  "Return the position of CONTEXT in the current buffer, or nil if not found."
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
  (let ((context-string (nth 2 context)))
    (if (equal "" context-string)
	(point-max)
      (save-excursion
	(let ((diff (- (nth 1 context) (buffer-size))))
	  (if (< diff 0) (setq diff (- diff)))
	  (goto-char (nth 0 context))
	  (if (or (search-forward context-string nil t)
		  ;; Can't use search-backward since the match may continue
		  ;; after point.
		  (progn (goto-char (- (point) diff (length context-string)))
			 ;; goto-char doesn't signal an error at
			 ;; beginning of buffer like backward-char would
			 (search-forward context-string nil t)))
	      ;; to beginning of OSTRING
	      (- (point) (length context-string))))))))

688
(defun vc-context-matches-p (posn context)
689
  "Return t if POSN matches CONTEXT, nil otherwise."
690 691 692 693 694 695 696
  (let* ((context-string (nth 2 context))
	 (len (length context-string))
	 (end (+ posn len)))
    (if (> end (1+ (buffer-size)))
	nil
      (string= context-string (buffer-substring posn end)))))

697
(defun vc-buffer-context ()
698 699
  "Return a list (POINT-CONTEXT MARK-CONTEXT REPARSE).
Used by `vc-restore-buffer-context' to later restore the context."
700
  (let ((point-context (vc-position-context (point)))
701 702 703 704
	;; Use mark-marker to avoid confusion in transient-mark-mode.
	(mark-context  (if (eq (marker-buffer (mark-marker)) (current-buffer))
			   (vc-position-context (mark-marker))))
	;; Make the right thing happen in transient-mark-mode.
705 706 707 708 709 710 711 712
	(mark-active nil)
	;; We may want to reparse the compilation buffer after revert
	(reparse (and (boundp 'compilation-error-list) ;compile loaded
		      (let ((curbuf (current-buffer)))
			;; Construct a list; each elt is nil or a buffer
			;; iff that buffer is a compilation output buffer
			;; that contains markers into the current buffer.
			(save-excursion
713
			  (mapcar (lambda (buffer)
714 715 716 717 718
				    (set-buffer buffer)
				    (let ((errors (or
						   compilation-old-error-list
						   compilation-error-list))
					  (buffer-error-marked-p nil))
719
				      (while (and (consp errors)
720
						  (not buffer-error-marked-p))
721
					(and (markerp (cdr (car errors)))
722 723
					     (eq buffer
						 (marker-buffer
724
						  (cdr (car errors))))
725
					     (setq buffer-error-marked-p t))
726
					(setq errors (cdr errors)))
727
				      (if buffer-error-marked-p buffer)))
728
				  (buffer-list)))))))
729 730 731
    (list point-context mark-context reparse)))

(defun vc-restore-buffer-context (context)
732
  "Restore point/mark, and reparse any affected compilation buffers.
733
CONTEXT is that which `vc-buffer-context' returns."
734 735 736
  (let ((point-context (nth 0 context))
	(mark-context (nth 1 context))
	(reparse (nth 2 context)))
737 738 739
    ;; Reparse affected compilation buffers.
    (while reparse
      (if (car reparse)
740
	  (with-current-buffer (car reparse)
741 742 743 744 745 746 747 748 749 750
	    (let ((compilation-last-buffer (current-buffer)) ;select buffer
		  ;; Record the position in the compilation buffer of
		  ;; the last error next-error went to.
		  (error-pos (marker-position
			      (car (car-safe compilation-error-list)))))
	      ;; Reparse the error messages as far as they were parsed before.
	      (compile-reinitialize-errors '(4) compilation-parsing-end)
	      ;; Move the pointer up to find the error we were at before
	      ;; reparsing.  Now next-error should properly go to the next one.
	      (while (and compilation-error-list
751
			  (/= error-pos (car (car compilation-error-list))))
752 753
		(setq compilation-error-list (cdr compilation-error-list))))))
      (setq reparse (cdr reparse)))
754

755 756 757 758
    ;; if necessary, restore point and mark
    (if (not (vc-context-matches-p (point) point-context))
	(let ((new-point (vc-find-position-by-context point-context)))
	  (if new-point (goto-char new-point))))
759 760 761 762 763
    (and mark-active
         mark-context
         (not (vc-context-matches-p (mark) mark-context))
         (let ((new-mark (vc-find-position-by-context mark-context)))
           (if new-mark (set-mark new-mark))))))
764

765
(defun vc-revert-buffer1 (&optional arg no-confirm)
766 767 768 769
  "Revert buffer, trying to keep point and mark where user expects them.
Tries to be clever in the face of changes due to expanded version control
key words.  This is important for typeahead to work as expected.
ARG and NO-CONFIRM are passed on to `revert-buffer'."
770 771 772
  (interactive "P")
  (widen)
  (let ((context (vc-buffer-context)))
773 774
    ;; Use save-excursion here, because it may be able to restore point
    ;; and mark properly even in cases where vc-restore-buffer-context
775
    ;; would fail.  However, save-excursion might also get it wrong --
776 777
    ;; in this case, vc-restore-buffer-context gives it a second try.
    (save-excursion
778
      ;; t means don't call normal-mode;
779 780
      ;; that's to preserve various minor modes.
      (revert-buffer arg no-confirm t))
781 782
    (vc-restore-buffer-context context)))

Eric S. Raymond's avatar
Eric S. Raymond committed
783

784
(defun vc-buffer-sync (&optional not-urgent)
785
  "Make sure the current buffer and its working file are in sync.
786
NOT-URGENT means it is ok to continue if the user says not to save."
787
  (if (buffer-modified-p)
788 789 790
      (if (or vc-suppress-confirm
	      (y-or-n-p (format "Buffer %s modified; save it? " (buffer-name))))
	  (save-buffer)
791
	(unless not-urgent
792 793
	  (error "Aborted")))))

794
(defun vc-workfile-unchanged-p (file)
795
  "Has FILE changed since last checkout?"
Eric S. Raymond's avatar
Eric S. Raymond committed
796
  (let ((checkout-time (vc-file-getprop file 'vc-checkout-time))
797 798 799 800 801 802 803 804
        (lastmod (nth 5 (file-attributes file))))
    (if checkout-time
        (equal checkout-time lastmod)
      (let ((unchanged (vc-call workfile-unchanged-p file)))
        (vc-file-setprop file 'vc-checkout-time (if unchanged lastmod 0))
        unchanged))))
      
(defun vc-default-workfile-unchanged-p (file)
805
  "Default check whether FILE is unchanged: diff against master version."
806
  (zerop (vc-call diff file (vc-workfile-version file))))
Eric S. Raymond's avatar
Eric S. Raymond committed
807

808 809 810 811 812
(defun vc-recompute-state (file)
  "Force a recomputation of the version control state of FILE.
The state is computed using the exact, and possibly expensive
function `vc-BACKEND-state', not the heuristic."
  (vc-file-setprop file 'vc-state (vc-call state file)))
813

814 815 816 817 818 819 820 821 822 823 824 825
(defun vc-next-action-on-file (file verbose &optional comment)
  "Do The Right Thing for a given version-controlled FILE.
If COMMENT is specified, it will be used as an admin or checkin comment.
If VERBOSE is non-nil, query the user rather than using default parameters."
  (let ((visited (get-file-buffer file))
	state version)
    (when visited
      ;; Check relation of buffer and file, and make sure
      ;; user knows what he's doing.  First, finding the file
      ;; will check whether the file on disk is newer.
      (if vc-dired-mode
	  (find-file-other-window file)
826
	(set-buffer (find-file-noselect file)))
827 828 829 830 831 832 833 834 835 836 837
      (if (not (verify-visited-file-modtime (current-buffer)))
	  (if (yes-or-no-p "Replace file on disk with buffer contents? ")
	      (write-file (buffer-file-name))
	    (error "Aborted"))
	;; Now, check if we have unsaved changes.
	(vc-buffer-sync t)
	(if (buffer-modified-p)
	    (or (y-or-n-p "Operate on disk file, keeping modified buffer? ")
		(error "Aborted")))))
    
    ;; Do the right thing
838
    (if (not (vc-registered file))
839 840
	(vc-register verbose comment)
      (vc-recompute-state file)
841
      (if visited (vc-mode-line file))
842 843 844 845 846 847 848 849
      (setq state (vc-state file))
      (cond
       ;; up-to-date
       ((or (eq state 'up-to-date)
	    (and verbose (eq state 'needs-patch)))
	(cond
	 (verbose
	  ;; go to a different version
850
	  (setq version
851
		(read-string "Branch, version, or backend to move to: "))
852
	  (let ((vsym (intern-soft (upcase version))))
853 854
	    (if (member vsym vc-handled-backends)
		(vc-transfer-file file vsym)
855
	      (vc-checkout file (eq (vc-checkout-model file) 'implicit)
856
			   version))))
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
	 ((not (eq (vc-checkout-model file) 'implicit))
	  ;; check the file out
	  (vc-checkout file t))
	 (t
	  ;; do nothing
	  (message "%s is up-to-date" file))))
       
       ;; Abnormal: edited but read-only
       ((and visited (eq state 'edited) buffer-read-only)
	;; Make the file+buffer read-write.  If the user really wanted to
	;; commit, he'll get a chance to do that next time around, anyway.
	(message "File is edited but read-only; making it writable")
	(set-file-modes buffer-file-name
			(logior (file-modes buffer-file-name) 128))
	(toggle-read-only -1))
       
       ;; edited
       ((eq state 'edited)
875
	(cond
876 877 878 879 880 881 882 883 884 885 886 887 888 889
	 ;; For files with locking, if the file does not contain
	 ;; any changes, just let go of the lock, i.e. revert.
	 ((and (not (eq (vc-checkout-model file) 'implicit))
	       (vc-workfile-unchanged-p file)
	       ;; If buffer is modified, that means the user just
	       ;; said no to saving it; in that case, don't revert,
	       ;; because the user might intend to save after
	       ;; finishing the log entry.
	       (not (and visited (buffer-modified-p))))
	  ;; DO NOT revert the file without asking the user!
	  (if (not visited) (find-file-other-window file))
	  (if (yes-or-no-p "Revert to master version? ")
	      (vc-revert-buffer)))
	 (t ;; normal action
890 891 892 893 894 895 896
	  (if (not verbose)
	      (vc-checkin file nil comment)
	    (setq version (read-string "New version or backend: "))
	    (let ((vsym (intern (upcase version))))
	      (if (member vsym vc-handled-backends)
		  (vc-transfer-file file vsym)
		(vc-checkin file version comment)))))))
897 898 899 900 901 902 903 904 905 906 907 908 909
       
       ;; locked by somebody else
       ((stringp state)
	(if comment
	    (error "Sorry, you can't steal the lock on %s this way"
		   (file-name-nondirectory file)))
	(vc-steal-lock file
                       (if verbose (read-string "Version to steal: ")
                         (vc-workfile-version file))
		       state))
       
       ;; needs-patch
       ((eq state 'needs-patch)
910
	(if (yes-or-no-p (format
911 912 913 914 915 916 917 918 919 920
			  "%s is not up-to-date.  Get latest version? "
			  (file-name-nondirectory file)))
	    (vc-checkout file (eq (vc-checkout-model file) 'implicit) "")
	  (if (and (not (eq (vc-checkout-model file) 'implicit))
		   (yes-or-no-p "Lock this version? "))
	      (vc-checkout file t)
	    (error "Aborted"))))
       
       ;; needs-merge
       ((eq state 'needs-merge)
921
	(if (yes-or-no-p (format
922 923 924 925 926 927 928 929 930 931 932
			  "%s is not up-to-date.  Merge in changes now? "
			  (file-name-nondirectory file)))
	    (vc-maybe-resolve-conflicts file (vc-call merge-news file))
	  (error "Aborted")))
       
       ;; unlocked-changes
       ((eq state 'unlocked-changes)
	(if (not visited) (find-file-other-window file))
	(if (save-window-excursion
	      (vc-version-diff file (vc-workfile-version file) nil)
	      (goto-char (point-min))
933 934 935
	      (let ((inhibit-read-only t))
		(insert-string
		 (format "Changes to %s since last lock:\n\n" file)))
936 937 938 939 940 941 942 943 944 945 946 947 948
	      (not (beep))
	      (yes-or-no-p (concat "File has unlocked changes.  "
				   "Claim lock retaining changes? ")))
	    (progn (vc-call steal-lock file)
		   ;; Must clear any headers here because they wouldn't
		   ;; show that the file is locked now.
		   (vc-clear-headers file)
		   (vc-mode-line file))
	  (if (not (yes-or-no-p
		    "Revert to checked-in version, instead? "))
	      (error "Checkout aborted")
	    (vc-revert-buffer1 t t)
	    (vc-checkout file t))))))))
949

950 951
(defvar vc-dired-window-configuration)

952
(defun vc-next-action-dired (file rev comment)
953 954
  "Call `vc-next-action-on-file' on all the marked files.
Ignores FILE and REV, but passes on COMMENT."
955
  (let ((dired-buffer (current-buffer))
956
	(dired-dir default-directory))
957
    (dired-map-over-marks
958
     (let ((file (dired-get-filename)))
959
       (message "Processing %s..." file)
960 961
       (vc-next-action-on-file file nil comment)
       (set-buffer dired-buffer)
962
       (set-window-configuration vc-dired-window-configuration)
963
       (message "Processing %s...done" file))
964 965
    nil t))
  (dired-move-to-filename))
966

Jim Blandy's avatar
Jim Blandy committed
967
;; Here's the major entry point.
Eric S. Raymond's avatar
Eric S. Raymond committed
968

Jim Blandy's avatar
Jim Blandy committed
969
;;;###autoload
Eric S. Raymond's avatar
Eric S. Raymond committed
970 971
(defun vc-next-action (verbose)
  "Do the next logical checkin or checkout operation on the current file.
972 973

If you call this from within a VC dired buffer with no files marked,
974
it will operate on the file in the current line.
975 976

If you call this from within a VC dired buffer, and one or more
977 978 979 980
files are marked, it will accept a log message and then operate on
each one.  The log message will be used as a comment for any register
or checkin operations, but ignored when doing checkouts.  Attempted
lock steals will raise an error.
981 982

A prefix argument lets you specify the version number to use.
983 984

For RCS and SCCS files:
Eric S. Raymond's avatar
Eric S. Raymond committed
985
   If the file is not already registered, this registers it for version
986
control.
Eric S. Raymond's avatar
Eric S. Raymond committed
987
   If the file is registered and not locked by anyone, this checks out
988
a writable and locked file ready for editing.
Eric S. Raymond's avatar
Eric S. Raymond committed
989 990 991
   If the file is checked out and locked by the calling user, this
first checks to see if the file has changed since checkout.  If not,
it performs a revert.
992 993
   If the file has been changed, this pops up a buffer for entry
of a log message; when the message has been entered, it checks in the
Eric S. Raymond's avatar
Eric S. Raymond committed
994
resulting changes along with the log message as change commentary.  If
995
the variable `vc-keep-workfiles' is non-nil (which is its default), a
Eric S. Raymond's avatar
Eric S. Raymond committed
996 997
read-only copy of the changed file is left in place afterwards.
   If the file is registered and locked by someone else, you are given
998
the option to steal the lock.
999 1000 1001 1002 1003 1004 1005 1006 1007 1008

For CVS files:
   If the file is not already registered, this registers it for version
control.  This does a \"cvs add\", but no \"cvs commit\".
   If the file is added but not committed, it is committed.
   If your working file is changed, but the repository file is
unchanged, this pops up a buffer for entry of a log message; when the
message has been entered, it checks in the resulting changes along
with the logmessage as change commentary.  A writable file is retained.
   If the repository file is changed, you are asked if you want to
1009
merge in the changes into your working copy."
1010

Eric S. Raymond's avatar
Eric S. Raymond committed
1011
  (interactive "P")
1012 1013 1014
  (catch 'nogo
    (if vc-dired-mode
	(let ((files (dired-get-marked-files)))
1015 1016
          (set (make-local-variable 'vc-dired-window-configuration)
               (current-window-configuration))
1017
	  (if (string= ""
1018
		 (mapconcat
1019 1020
	             (lambda (f)
		       (if (not (vc-up-to-date-p f)) "@" ""))
1021 1022
		     files ""))
		(vc-next-action-dired nil nil "dummy")
1023
	      (vc-start-entry nil nil nil nil
1024 1025
			      "Enter a change comment for the marked files."
			      'vc-next-action-dired))
1026
	    (throw 'nogo nil)))
1027 1028 1029 1030 1031
    (while vc-parent-buffer
      (pop-to-buffer vc-parent-buffer))
    (if buffer-file-name
        (vc-next-action-on-file buffer-file-name verbose)
      (error "Buffer %s is not associated with a file" (buffer-name)))))
Eric S. Raymond's avatar
Eric S. Raymond committed
1032 1033 1034

;;; These functions help the vc-next-action entry point

Jim Blandy's avatar
Jim Blandy committed
1035
;;;###autoload
1036
(defun vc-register (&optional set-version comment)
1037
  "Register the current file into a version control system.
1038
With prefix argument SET-VERSION, allow user to specify initial version
1039 1040
level.  If COMMENT is present, use that as an initial comment.

1041
The version control system to use is found by cycling through the list
1042 1043 1044 1045 1046
`vc-handled-backends'.  The first backend in that list which declares
itself responsible for the file (usually because other files in that
directory are already registered under that backend) will be used to
register the file.  If no backend declares itself responsible, the
first backend that could register the file is used."
Eric S. Raymond's avatar
Eric S. Raymond committed
1047
  (interactive "P")
1048
  (unless buffer-file-name (error "No visited file"))
1049 1050 1051 1052 1053
  (when (vc-backend buffer-file-name)
    (if (vc-registered buffer-file-name)
	(error "This file is already registered")
      (unless (y-or-n-p "Previous master file has vanished.  Make a new one? ")
	(error "Aborted"))))
1054 1055 1056 1057 1058 1059
  ;; Watch out for new buffers of size 0: the corresponding file
  ;; does not exist yet, even though buffer-modified-p is nil.
  (if (and (not (buffer-modified-p))
	   (zerop (buffer-size))
	   (not (file-exists-p buffer-file-name)))
      (set-buffer-modified-p t))
Eric S. Raymond's avatar
Eric S. Raymond committed
1060
  (vc-buffer-sync)
1061 1062 1063
  
  (vc-start-entry buffer-file-name
                  (if set-version