lisp/vc-svn.el

   1 ;;; vc-svn.el --- non-resident support for Subversion version-control
   2
   3 ;; Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
   4
   5 ;; Author:      FSF (see vc.el for full credits)
   6 ;; Maintainer:  Stefan Monnier <monnier@gnu.org>
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 3, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; Sync'd with Subversion's vc-svn.el as of revision 5801. but this version
  28 ;; has been extensively modified since to handle filesets.
  29
  30 ;;; Bugs:
  31
  32 ;; - VC-dired is (really) slow.
  33
  34 ;;; Code:
  35
  36 (eval-when-compile
  37   (require 'vc))
  38
  39 ;;;
  40 ;;; Customization options
  41 ;;;
  42
  43 (defcustom vc-svn-global-switches nil
  44   "*Global switches to pass to any SVN command."
  45   :type '(choice (const :tag "None" nil)
  46                  (string :tag "Argument String")
  47                  (repeat :tag "Argument List"
  48                          :value ("")
  49                          string))
  50   :version "22.1"
  51   :group 'vc)
  52
  53 (defcustom vc-svn-register-switches nil
  54   "*Extra switches for registering a file into SVN.
  55 A string or list of strings passed to the checkin program by
  56 \\[vc-register]."
  57   :type '(choice (const :tag "None" nil)
  58                  (string :tag "Argument String")
  59                  (repeat :tag "Argument List"
  60                          :value ("")
  61                          string))
  62   :version "22.1"
  63   :group 'vc)
  64
  65 (defcustom vc-svn-diff-switches
  66   t                        ;`svn' doesn't support common args like -c or -b.
  67   "String or list of strings specifying extra switches for svn diff under VC.
  68 If nil, use the value of `vc-diff-switches'.
  69 If you want to force an empty list of arguments, use t."
  70   :type '(choice (const :tag "Unspecified" nil)
  71                  (const :tag "None" t)
  72                  (string :tag "Argument String")
  73                  (repeat :tag "Argument List"
  74                          :value ("")
  75                          string))
  76   :version "22.1"
  77   :group 'vc)
  78
  79 (defcustom vc-svn-header (or (cdr (assoc 'SVN vc-header-alist)) '("\$Id\$"))
  80   "*Header keywords to be inserted by `vc-insert-headers'."
  81   :version "22.1"
  82   :type '(repeat string)
  83   :group 'vc)
  84
  85 ;; We want to autoload it for use by the autoloaded version of
  86 ;; vc-svn-registered, but we want the value to be compiled at startup, not
  87 ;; at dump time.
  88 ;; ;;;###autoload
  89 (defconst vc-svn-admin-directory
  90   (cond ((and (memq system-type '(cygwin windows-nt ms-dos))
  91               (getenv "SVN_ASP_DOT_NET_HACK"))
  92          "_svn")
  93         (t ".svn"))
  94   "The name of the \".svn\" subdirectory or its equivalent.")
  95
  96 ;;; Properties of the backend
  97
  98 (defun vc-svn-revision-granularity ()
  99      'repository)
 100 ;;;
 101 ;;; State-querying functions
 102 ;;;
 103
 104 ;;; vc-svn-admin-directory is generally not defined when the
 105 ;;; autoloaded function is called.
 106
 107 ;;;###autoload (defun vc-svn-registered (f)
 108 ;;;###autoload   (let ((admin-dir (cond ((and (eq system-type 'windows-nt)
 109 ;;;###autoload                                (getenv "SVN_ASP_DOT_NET_HACK"))
 110 ;;;###autoload                           "_svn")
 111 ;;;###autoload                          (t ".svn"))))
 112 ;;;###autoload     (when (file-readable-p (expand-file-name
 113 ;;;###autoload                             (concat admin-dir "/entries")
 114 ;;;###autoload                             (file-name-directory f)))
 115 ;;;###autoload       (load "vc-svn")
 116 ;;;###autoload       (vc-svn-registered f))))
 117
 118 ;;;###autoload
 119 (add-to-list 'completion-ignored-extensions ".svn/")
 120
 121 (defun vc-svn-registered (file)
 122   "Check if FILE is SVN registered."
 123   (when (file-readable-p (expand-file-name (concat vc-svn-admin-directory
 124                                                    "/entries")
 125                                            (file-name-directory file)))
 126     (with-temp-buffer
 127       (cd (file-name-directory file))
 128       (let ((status
 129              (condition-case nil
 130                  ;; Ignore all errors.
 131                  (vc-svn-command t t file "status" "-v")
 132                ;; Some problem happened.  E.g. We can't find an `svn'
 133                ;; executable.  We used to only catch `file-error' but when
 134                ;; the process is run on a remote host via Tramp, the error
 135                ;; is only reported via the exit status which is turned into
 136                ;; an `error' by vc-do-command.
 137                (error nil))))
 138         (when (eq 0 status)
 139           (vc-svn-parse-status file))))))
 140
 141 (defun vc-svn-state (file &optional localp)
 142   "SVN-specific version of `vc-state'."
 143   (setq localp (or localp (vc-stay-local-p file)))
 144   (with-temp-buffer
 145     (cd (file-name-directory file))
 146     (vc-svn-command t 0 file "status" (if localp "-v" "-u"))
 147     (vc-svn-parse-status file)))
 148
 149 (defun vc-svn-state-heuristic (file)
 150   "SVN-specific state heuristic."
 151   (vc-svn-state file 'local))
 152
 153 (defun vc-svn-dir-state (dir &optional localp)
 154   "Find the SVN state of all files in DIR."
 155   (setq localp (or localp (vc-stay-local-p dir)))
 156   (let ((default-directory dir))
 157     ;; Don't specify DIR in this command, the default-directory is
 158     ;; enough.  Otherwise it might fail with remote repositories.
 159     (with-temp-buffer
 160       (vc-svn-command t 0 nil "status" (if localp "-v" "-u"))
 161       (vc-svn-parse-status))))
 162
 163 (defun vc-svn-workfile-version (file)
 164   "SVN-specific version of `vc-workfile-version'."
 165   ;; There is no need to consult RCS headers under SVN, because we
 166   ;; get the workfile version for free when we recognize that a file
 167   ;; is registered in SVN.
 168   (vc-svn-registered file)
 169   (vc-file-getprop file 'vc-workfile-version))
 170
 171 (defun vc-svn-checkout-model (file)
 172   "SVN-specific version of `vc-checkout-model'."
 173   ;; It looks like Subversion has no equivalent of CVSREAD.
 174   'implicit)
 175
 176 ;; vc-svn-mode-line-string doesn't exist because the default implementation
 177 ;; works just fine.
 178
 179 (defun vc-svn-dired-state-info (file)
 180   "SVN-specific version of `vc-dired-state-info'."
 181   (let ((svn-state (vc-state file)))
 182     (cond ((eq svn-state 'edited)
 183            (if (equal (vc-workfile-version file) "0")
 184                "(added)" "(modified)"))
 185           ((eq svn-state 'needs-patch) "(patch)")
 186           ((eq svn-state 'needs-merge) "(merge)"))))
 187
 188 (defun vc-svn-previous-version (file rev)
 189   (let ((newrev (1- (string-to-number rev))))
 190     (when (< 0 newrev)
 191       (number-to-string newrev))))
 192
 193 (defun vc-svn-next-version (file rev)
 194   (let ((newrev (1+ (string-to-number rev))))
 195     ;; The "workfile version" is an uneasy conceptual fit under Subversion;
 196     ;; we use it as the upper bound until a better idea comes along.  If the
 197     ;; workfile version W coincides with the tree's latest revision R, then
 198     ;; this check prevents a "no such revision: R+1" error.  Otherwise, it
 199     ;; inhibits showing of W+1 through R, which could be considered anywhere
 200     ;; from gracious to impolite.
 201     (unless (< (string-to-number (vc-file-getprop file 'vc-workfile-version))
 202                newrev)
 203       (number-to-string newrev))))
 204
 205
 206 ;;;
 207 ;;; State-changing functions
 208 ;;;
 209
 210 (defun vc-svn-create-repo ()
 211   "Create a new SVN repository."
 212   (vc-do-command nil 0 "svnadmin" '("create" "SVN"))
 213   (vc-do-command nil 0 "svn" '(".")
 214                  "checkout" (concat "file://" default-directory "SVN")))
 215
 216 (defun vc-svn-register (files &optional rev comment)
 217   "Register FILES into the SVN version-control system.
 218 The COMMENT argument is ignored  This does an add but not a commit.
 219
 220 `vc-register-switches' and `vc-svn-register-switches' are passed to
 221 the SVN command (in that order)."
 222   (apply 'vc-svn-command nil 0 files "add" (vc-switches 'SVN 'register)))
 223
 224 (defun vc-svn-responsible-p (file)
 225   "Return non-nil if SVN thinks it is responsible for FILE."
 226   (file-directory-p (expand-file-name vc-svn-admin-directory
 227                                       (if (file-directory-p file)
 228                                           file
 229                                         (file-name-directory file)))))
 230
 231 (defalias 'vc-svn-could-register 'vc-svn-responsible-p
 232   "Return non-nil if FILE could be registered in SVN.
 233 This is only possible if SVN is responsible for FILE's directory.")
 234
 235 (defun vc-svn-checkin (files rev comment)
 236   "SVN-specific version of `vc-backend-checkin'."
 237   (if rev (error "Committing to a specific revision is unsupported in SVN."))
 238   (let ((status (apply
 239                  'vc-svn-command nil 1 files "ci"
 240                  (nconc (list "-m" comment) (vc-switches 'SVN 'checkin)))))
 241     (set-buffer "*vc*")
 242     (goto-char (point-min))
 243     (unless (equal status 0)
 244       ;; Check checkin problem.
 245       (cond
 246        ((search-forward "Transaction is out of date" nil t)
 247         (mapc (lambda (file) (vc-file-setprop file 'vc-state 'needs-merge))
 248               files)
 249         (error (substitute-command-keys
 250                 (concat "Up-to-date check failed: "
 251                         "type \\[vc-next-action] to merge in changes"))))
 252        (t
 253         (pop-to-buffer (current-buffer))
 254         (goto-char (point-min))
 255         (shrink-window-if-larger-than-buffer)
 256         (error "Check-in failed"))))
 257     ;; Update file properties
 258     ;; (vc-file-setprop
 259     ;;  file 'vc-workfile-version
 260     ;;  (vc-parse-buffer "^\\(new\\|initial\\) revision: \\([0-9.]+\\)" 2))
 261     ))
 262
 263 (defun vc-svn-find-version (file rev buffer)
 264   "SVN-specific retrieval of a specified version into a buffer."
 265   (apply 'vc-svn-command
 266          buffer 0 file
 267          "cat"
 268          (and rev (not (string= rev ""))
 269               (concat "-r" rev))
 270          (vc-switches 'SVN 'checkout)))
 271
 272 (defun vc-svn-checkout (file &optional editable rev)
 273   (message "Checking out %s..." file)
 274   (with-current-buffer (or (get-file-buffer file) (current-buffer))
 275     (vc-call update file editable rev (vc-switches 'SVN 'checkout)))
 276   (vc-mode-line file)
 277   (message "Checking out %s...done" file))
 278
 279 (defun vc-svn-update (file editable rev switches)
 280   (if (and (file-exists-p file) (not rev))
 281       ;; If no revision was specified, there's nothing to do.
 282       nil
 283     ;; Check out a particular version (or recreate the file).
 284     (vc-file-setprop file 'vc-workfile-version nil)
 285     (apply 'vc-svn-command nil 0 file
 286            "update"
 287            ;; default for verbose checkout: clear the sticky tag so
 288            ;; that the actual update will get the head of the trunk
 289            (cond
 290             ((null rev) "-rBASE")
 291             ((or (eq rev t) (equal rev "")) nil)
 292             (t (concat "-r" rev)))
 293            switches)))
 294
 295 (defun vc-svn-delete-file (file)
 296   (vc-svn-command nil 0 file "remove"))
 297
 298 (defun vc-svn-rename-file (old new)
 299   (vc-svn-command nil 0 new "move" (file-relative-name old)))
 300
 301 (defun vc-svn-revert (file &optional contents-done)
 302   "Revert FILE to the version it was based on."
 303   (unless contents-done
 304     (vc-svn-command nil 0 file "revert")))
 305
 306 (defun vc-svn-merge (file first-version &optional second-version)
 307   "Merge changes into current working copy of FILE.
 308 The changes are between FIRST-VERSION and SECOND-VERSION."
 309   (vc-svn-command nil 0 file
 310                  "merge"
 311                  "-r" (if second-version
 312                         (concat first-version ":" second-version)
 313                       first-version))
 314   (vc-file-setprop file 'vc-state 'edited)
 315   (with-current-buffer (get-buffer "*vc*")
 316     (goto-char (point-min))
 317     (if (looking-at "C  ")
 318         1                               ; signal conflict
 319       0)))                              ; signal success
 320
 321 (defun vc-svn-merge-news (file)
 322   "Merge in any new changes made to FILE."
 323   (message "Merging changes into %s..." file)
 324   ;; (vc-file-setprop file 'vc-workfile-version nil)
 325   (vc-file-setprop file 'vc-checkout-time 0)
 326   (vc-svn-command nil 0 file "update")
 327   ;; Analyze the merge result reported by SVN, and set
 328   ;; file properties accordingly.
 329   (with-current-buffer (get-buffer "*vc*")
 330     (goto-char (point-min))
 331     ;; get new workfile version
 332     (if (re-search-forward
 333          "^\\(Updated to\\|At\\) revision \\([0-9]+\\)" nil t)
 334         (vc-file-setprop file 'vc-workfile-version (match-string 2))
 335       (vc-file-setprop file 'vc-workfile-version nil))
 336     ;; get file status
 337     (goto-char (point-min))
 338     (prog1
 339         (if (looking-at "At revision")
 340             0 ;; there were no news; indicate success
 341           (if (re-search-forward
 342                ;; Newer SVN clients have 3 columns of chars (one for the
 343                ;; file's contents, then second for its properties, and the
 344                ;; third for lock-grabbing info), before the 2 spaces.
 345                ;; We also used to match the filename in column 0 without any
 346                ;; meta-info before it, but I believe this can never happen.
 347                (concat "^\\(\\([ACGDU]\\)\\(.[B ]\\)?  \\)"
 348                        (regexp-quote (file-name-nondirectory file)))
 349                nil t)
 350               (cond
 351                ;; Merge successful, we are in sync with repository now
 352                ((string= (match-string 2) "U")
 353                 (vc-file-setprop file 'vc-state 'up-to-date)
 354                 (vc-file-setprop file 'vc-checkout-time
 355                                  (nth 5 (file-attributes file)))
 356                 0);; indicate success to the caller
 357                ;; Merge successful, but our own changes are still in the file
 358                ((string= (match-string 2) "G")
 359                 (vc-file-setprop file 'vc-state 'edited)
 360                 0);; indicate success to the caller
 361                ;; Conflicts detected!
 362                (t
 363                 (vc-file-setprop file 'vc-state 'edited)
 364                 1);; signal the error to the caller
 365                )
 366             (pop-to-buffer "*vc*")
 367             (error "Couldn't analyze svn update result")))
 368       (message "Merging changes into %s...done" file))))
 369
 370
 371 ;;;
 372 ;;; History functions
 373 ;;;
 374
 375 (defun vc-svn-print-log (files &optional buffer)
 376   "Get change log(s) associated with FILES."
 377   (save-current-buffer
 378     (vc-setup-buffer buffer)
 379     (let ((inhibit-read-only t))
 380       (goto-char (point-min))
 381       ;; Add a line to tell log-view-mode what file this is.
 382       ;; FIXME if there are multiple files, log-view-current-file
 383       ;; breaks.  It's trivial to adapt log-view-file-re for the
 384       ;; changed prefix, but less trivial to make
 385       ;; log-view-current-file actually do the right thing in the
 386       ;; multiple file case.
 387       (insert (format "Working file%s: "
 388                       (if (= (length files) 1)
 389                           ""
 390                         "s"))
 391                       (vc-delistify (mapcar 'file-relative-name files)) "\n"))
 392     (vc-svn-command
 393      buffer
 394      (if (and (= (length files) 1) (vc-stay-local-p (car files)) (fboundp 'start-process)) 'async 0)
 395      files "log"
 396      ;; By default Subversion only shows the log upto the working version,
 397      ;; whereas we also want the log of the subsequent commits.  At least
 398      ;; that's what the vc-cvs.el code does.
 399      "-rHEAD:0")))
 400
 401 (defun vc-svn-wash-log ()
 402   "Remove all non-comment information from log output."
 403   ;; FIXME: not implemented for SVN
 404   nil)
 405
 406 (defun vc-svn-diff (files &optional oldvers newvers buffer)
 407   "Get a difference report using SVN between two versions of fileset FILES."
 408   (and oldvers
 409        (catch 'no
 410          (dolist (f files)
 411            (or (equal oldvers (vc-workfile-version f))
 412                (throw 'no nil)))
 413          t)
 414        ;; Use nil rather than the current revision because svn handles
 415        ;; it better (i.e. locally).  Note that if _any_ of the files
 416        ;; has a different revision, we fetch the lot, which is
 417        ;; obviously sub-optimal.
 418        (setq oldvers nil))
 419   (let* ((switches
 420             (if vc-svn-diff-switches
 421                 (vc-switches 'SVN 'diff)
 422               (list "-x" (mapconcat 'identity (vc-switches nil 'diff) " "))))
 423            (async (and (not vc-disable-async-diff)
 424                        (vc-stay-local-p files)
 425                        (or oldvers newvers) ; Svn diffs those locally.
 426                        (fboundp 'start-process))))
 427       (apply 'vc-svn-command buffer
 428              (if async 'async 0)
 429              files "diff"
 430              (append
 431               switches
 432               (when oldvers
 433                 (list "-r" (if newvers (concat oldvers ":" newvers)
 434                              oldvers)))))
 435       (if async 1                     ; async diff => pessimistic assumption
 436         ;; For some reason `svn diff' does not return a useful
 437         ;; status w.r.t whether the diff was empty or not.
 438         (buffer-size (get-buffer buffer)))))
 439
 440 (defun vc-svn-diff-tree (dir &optional rev1 rev2)
 441   "Diff all files at and below DIR."
 442   (vc-svn-diff (list (file-name-as-directory dir)) rev1 rev2))
 443
 444 ;;;
 445 ;;; Snapshot system
 446 ;;;
 447
 448 (defun vc-svn-create-snapshot (dir name branchp)
 449   "Assign to DIR's current version a given NAME.
 450 If BRANCHP is non-nil, the name is created as a branch (and the current
 451 workspace is immediately moved to that new branch).
 452 NAME is assumed to be a URL."
 453   (vc-svn-command nil 0 dir "copy" name)
 454   (when branchp (vc-svn-retrieve-snapshot dir name nil)))
 455
 456 (defun vc-svn-retrieve-snapshot (dir name update)
 457   "Retrieve a snapshot at and below DIR.
 458 NAME is the name of the snapshot; if it is empty, do a `svn update'.
 459 If UPDATE is non-nil, then update (resynch) any affected buffers.
 460 NAME is assumed to be a URL."
 461   (vc-svn-command nil 0 dir "switch" name)
 462   ;; FIXME: parse the output and obey `update'.
 463   )
 464
 465 ;;;
 466 ;;; Miscellaneous
 467 ;;;
 468
 469 ;; Subversion makes backups for us, so don't bother.
 470 ;; (defalias 'vc-svn-make-version-backups-p 'vc-stay-local-p
 471 ;;   "Return non-nil if version backups should be made for FILE.")
 472
 473 (defun vc-svn-check-headers ()
 474   "Check if the current file has any headers in it."
 475   (save-excursion
 476     (goto-char (point-min))
 477     (re-search-forward "\\$[A-Za-z\300-\326\330-\366\370-\377]+\
 478 \\(: [\t -#%-\176\240-\377]*\\)?\\$" nil t)))
 479
 480
 481 ;;;
 482 ;;; Internal functions
 483 ;;;
 484
 485 (defcustom vc-svn-program "svn"
 486   "Name of the svn executable."
 487   :type 'string
 488   :group 'vc)
 489
 490 (defun vc-svn-command (buffer okstatus file-or-list &rest flags)
 491   "A wrapper around `vc-do-command' for use in vc-svn.el.
 492 The difference to vc-do-command is that this function always invokes `svn',
 493 and that it passes `vc-svn-global-switches' to it before FLAGS."
 494   (apply 'vc-do-command buffer okstatus vc-svn-program file-or-list
 495          (if (stringp vc-svn-global-switches)
 496              (cons vc-svn-global-switches flags)
 497            (append vc-svn-global-switches
 498                    flags))))
 499
 500 (defun vc-svn-repository-hostname (dirname)
 501   (with-temp-buffer
 502     (let ((coding-system-for-read
 503            (or file-name-coding-system
 504                default-file-name-coding-system)))
 505       (vc-insert-file (expand-file-name (concat vc-svn-admin-directory
 506                                                 "/entries")
 507                                         dirname)))
 508     (goto-char (point-min))
 509     (when (re-search-forward
 510            ;; Old `svn' used name="svn:this_dir", newer use just name="".
 511            (concat "name=\"\\(?:svn:this_dir\\)?\"[\n\t ]*"
 512                    "\\(?:[-a-z]+=\"[^\"]*\"[\n\t ]*\\)*?"
 513                    "url=\"\\(?1:[^\"]+\\)\""
 514                    ;; Yet newer ones don't use XML any more.
 515                    "\\|^\ndir\n[0-9]+\n\\(?1:.*\\)") nil t)
 516       ;; This is not a hostname but a URL.  This may actually be considered
 517       ;; as a feature since it allows vc-svn-stay-local to specify different
 518       ;; behavior for different modules on the same server.
 519       (match-string 1))))
 520
 521 (defun vc-svn-resolve-when-done ()
 522   "Call \"svn resolved\" if the conflict markers have been removed."
 523   (save-excursion
 524     (goto-char (point-min))
 525     (if (not (re-search-forward "^<<<<<<< " nil t))
 526         (vc-svn-command nil 0 buffer-file-name "resolved"))))
 527
 528 ;; Inspired by vc-arch-find-file-hook.
 529 (defun vc-svn-find-file-hook ()
 530   (when (eq ?C (vc-file-getprop buffer-file-name 'vc-svn-status))
 531     ;; If the file is marked as "conflicted", then we should try and call
 532     ;; "svn resolved" when applicable.
 533     (if (save-excursion
 534           (goto-char (point-min))
 535           (re-search-forward "^<<<<<<< " nil t))
 536         ;; There are conflict markers.
 537         (progn
 538           (smerge-mode 1)
 539           (add-hook 'after-save-hook 'vc-svn-resolve-when-done nil t))
 540       ;; There are no conflict markers.  This is problematic: maybe it means
 541       ;; the conflict has been resolved and we should immediately call "svn
 542       ;; resolved", or it means that the file's type does not allow Svn to
 543       ;; use conflict markers in which case we don't really know what to do.
 544       ;; So let's just punt for now.
 545       nil)
 546     (message "There are unresolved conflicts in this file")))
 547
 548 (defun vc-svn-parse-status (&optional filename)
 549   "Parse output of \"svn status\" command in the current buffer.
 550 Set file properties accordingly.  Unless FILENAME is non-nil, parse only
 551 information about FILENAME and return its status."
 552   (let (file status)
 553     (goto-char (point-min))
 554     (while (re-search-forward
 555             ;; Ignore the files with status in [IX?].
 556             "^[ ACDGMR!~][ MC][ L][ +][ S]..\\([ *]\\) +\\([-0-9]+\\) +\\([0-9?]+\\) +\\([^ ]+\\) +" nil t)
 557       ;; If the username contains spaces, the output format is ambiguous,
 558       ;; so don't trust the output's filename unless we have to.
 559       (setq file (or filename
 560                      (expand-file-name
 561                       (buffer-substring (point) (line-end-position)))))
 562       (setq status (char-after (line-beginning-position)))
 563       (unless (eq status ??)
 564         ;; `vc-BACKEND-registered' must not set vc-backend,
 565         ;; which is instead set in vc-registered.
 566         (unless filename (vc-file-setprop file 'vc-backend 'SVN))
 567         ;; Use the last-modified revision, so that searching in vc-print-log
 568         ;; output works.
 569         (vc-file-setprop file 'vc-workfile-version (match-string 3))
 570         ;; Remember Svn's own status.
 571         (vc-file-setprop file 'vc-svn-status status)
 572         (vc-file-setprop
 573          file 'vc-state
 574          (cond
 575           ((eq status ?\ )
 576            (if (eq (char-after (match-beginning 1)) ?*)
 577                'needs-patch
 578              (vc-file-setprop file 'vc-checkout-time
 579                               (nth 5 (file-attributes file)))
 580              'up-to-date))
 581           ((eq status ?A)
 582            ;; If the file was actually copied, (match-string 2) is "-".
 583            (vc-file-setprop file 'vc-workfile-version "0")
 584            (vc-file-setprop file 'vc-checkout-time 0)
 585            'edited)
 586           ((memq status '(?M ?C))
 587            (if (eq (char-after (match-beginning 1)) ?*)
 588                'needs-merge
 589              'edited))
 590           (t 'edited)))))
 591     (if filename (vc-file-getprop filename 'vc-state))))
 592
 593 (defun vc-svn-dir-state-heuristic (dir)
 594   "Find the SVN state of all files in DIR, using only local information."
 595   (vc-svn-dir-state dir 'local))
 596
 597 (defun vc-svn-valid-symbolic-tag-name-p (tag)
 598   "Return non-nil if TAG is a valid symbolic tag name."
 599   ;; According to the SVN manual, a valid symbolic tag must start with
 600   ;; an uppercase or lowercase letter and can contain uppercase and
 601   ;; lowercase letters, digits, `-', and `_'.
 602   (and (string-match "^[a-zA-Z]" tag)
 603        (not (string-match "[^a-z0-9A-Z-_]" tag))))
 604
 605 (defun vc-svn-valid-version-number-p (tag)
 606   "Return non-nil if TAG is a valid version number."
 607   (and (string-match "^[0-9]" tag)
 608        (not (string-match "[^0-9]" tag))))
 609
 610 ;; Support for `svn annotate'
 611
 612 (defun vc-svn-annotate-command (file buf &optional rev)
 613   (vc-svn-command buf 0 file "annotate" (if rev (concat "-r" rev))))
 614
 615 (defun vc-svn-annotate-time-of-rev (rev)
 616   ;; Arbitrarily assume 10 commmits per day.
 617   (/ (string-to-number rev) 10.0))
 618
 619 (defun vc-svn-annotate-current-time ()
 620   (vc-svn-annotate-time-of-rev vc-annotate-parent-rev))
 621
 622 (defconst vc-svn-annotate-re "[ \t]*\\([0-9]+\\)[ \t]+[^\t ]+ ")
 623
 624 (defun vc-svn-annotate-time ()
 625   (when (looking-at vc-svn-annotate-re)
 626     (goto-char (match-end 0))
 627     (vc-svn-annotate-time-of-rev (match-string 1))))
 628
 629 (defun vc-svn-annotate-extract-revision-at-line ()
 630   (save-excursion
 631     (beginning-of-line)
 632     (if (looking-at vc-svn-annotate-re) (match-string 1))))
 633
 634 (provide 'vc-svn)
 635
 636 ;; arch-tag: 02f10c68-2b4d-453a-90fc-1eee6cfb268d
 637 ;;; vc-svn.el ends here