lisp/vc-svn.el

   1 ;;; vc-svn.el --- non-resident support for Subversion version-control
   2
   3 ;; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   4 ;;   Free Software Foundation, Inc.
   5
   6 ;; Author:      FSF (see vc.el for full credits)
   7 ;; Maintainer:  Stefan Monnier <monnier@gnu.org>
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Sync'd with Subversion's vc-svn.el as of revision 5801. but this version
  27 ;; has been extensively modified since to handle filesets.
  28
  29 ;;; Code:
  30
  31 (eval-when-compile
  32   (require 'vc))
  33
  34 ;; Clear up the cache to force vc-call to check again and discover
  35 ;; new functions when we reload this file.
  36 (put 'SVN 'vc-functions nil)
  37
  38 ;;;
  39 ;;; Customization options
  40 ;;;
  41
  42 ;; FIXME there is also svnadmin.
  43 (defcustom vc-svn-program "svn"
  44   "Name of the SVN executable."
  45   :type 'string
  46   :group 'vc)
  47
  48 (defcustom vc-svn-global-switches nil
  49   "Global switches to pass to any SVN command."
  50   :type '(choice (const :tag "None" nil)
  51                  (string :tag "Argument String")
  52                  (repeat :tag "Argument List"
  53                          :value ("")
  54                          string))
  55   :version "22.1"
  56   :group 'vc)
  57
  58 (defcustom vc-svn-register-switches nil
  59   "Switches for registering a file into SVN.
  60 A string or list of strings passed to the checkin program by
  61 \\[vc-register].  If nil, use the value of `vc-register-switches'.
  62 If t, use no switches."
  63   :type '(choice (const :tag "Unspecified" nil)
  64                  (const :tag "None" t)
  65                  (string :tag "Argument String")
  66                  (repeat :tag "Argument List" :value ("") string))
  67   :version "22.1"
  68   :group 'vc)
  69
  70 (defcustom vc-svn-diff-switches
  71   t                        ;`svn' doesn't support common args like -c or -b.
  72   "String or list of strings specifying extra switches for svn diff under VC.
  73 If nil, use the value of `vc-diff-switches' (or `diff-switches'),
  74 together with \"-x --diff-cmd=diff\" (since svn diff does not
  75 support the default \"-c\" value of `diff-switches').  If you
  76 want to force an empty list of arguments, use t."
  77   :type '(choice (const :tag "Unspecified" nil)
  78                  (const :tag "None" t)
  79                  (string :tag "Argument String")
  80                  (repeat :tag "Argument List"
  81                          :value ("")
  82                          string))
  83   :version "22.1"
  84   :group 'vc)
  85
  86 (defcustom vc-svn-header (or (cdr (assoc 'SVN vc-header-alist)) '("\$Id\$"))
  87   "Header keywords to be inserted by `vc-insert-headers'."
  88   :version "22.1"
  89   :type '(repeat string)
  90   :group 'vc)
  91
  92 ;; We want to autoload it for use by the autoloaded version of
  93 ;; vc-svn-registered, but we want the value to be compiled at startup, not
  94 ;; at dump time.
  95 ;; ;;;###autoload
  96 (defconst vc-svn-admin-directory
  97   (cond ((and (memq system-type '(cygwin windows-nt ms-dos))
  98               (getenv "SVN_ASP_DOT_NET_HACK"))
  99          "_svn")
 100         (t ".svn"))
 101   "The name of the \".svn\" subdirectory or its equivalent.")
 102
 103 ;;; Properties of the backend
 104
 105 (defun vc-svn-revision-granularity () 'repository)
 106 (defun vc-svn-checkout-model (files) 'implicit)
 107
 108 ;;;
 109 ;;; State-querying functions
 110 ;;;
 111
 112 ;;; vc-svn-admin-directory is generally not defined when the
 113 ;;; autoloaded function is called.
 114
 115 ;;;###autoload (defun vc-svn-registered (f)
 116 ;;;###autoload   (let ((admin-dir (cond ((and (eq system-type 'windows-nt)
 117 ;;;###autoload                                (getenv "SVN_ASP_DOT_NET_HACK"))
 118 ;;;###autoload                           "_svn")
 119 ;;;###autoload                          (t ".svn"))))
 120 ;;;###autoload     (when (file-readable-p (expand-file-name
 121 ;;;###autoload                             (concat admin-dir "/entries")
 122 ;;;###autoload                             (file-name-directory f)))
 123 ;;;###autoload       (load "vc-svn")
 124 ;;;###autoload       (vc-svn-registered f))))
 125
 126 (defun vc-svn-registered (file)
 127   "Check if FILE is SVN registered."
 128   (when (file-readable-p (expand-file-name (concat vc-svn-admin-directory
 129                                                    "/entries")
 130                                            (file-name-directory file)))
 131     (with-temp-buffer
 132       (cd (file-name-directory file))
 133       (let* (process-file-side-effects
 134              (status
 135              (condition-case nil
 136                  ;; Ignore all errors.
 137                  (vc-svn-command t t file "status" "-v")
 138                ;; Some problem happened.  E.g. We can't find an `svn'
 139                ;; executable.  We used to only catch `file-error' but when
 140                ;; the process is run on a remote host via Tramp, the error
 141                ;; is only reported via the exit status which is turned into
 142                ;; an `error' by vc-do-command.
 143                (error nil))))
 144         (when (eq 0 status)
 145           (let ((parsed (vc-svn-parse-status file)))
 146             (and parsed (not (memq parsed '(ignored unregistered))))))))))
 147
 148 (defun vc-svn-state (file &optional localp)
 149   "SVN-specific version of `vc-state'."
 150   (let (process-file-side-effects)
 151     (setq localp (or localp (vc-stay-local-p file 'SVN)))
 152     (with-temp-buffer
 153       (cd (file-name-directory file))
 154       (vc-svn-command t 0 file "status" (if localp "-v" "-u"))
 155       (vc-svn-parse-status file))))
 156
 157 (defun vc-svn-state-heuristic (file)
 158   "SVN-specific state heuristic."
 159   (vc-svn-state file 'local))
 160
 161 ;; FIXME it would be better not to have the "remote" argument,
 162 ;; but to distinguish the two output formats based on content.
 163 (defun vc-svn-after-dir-status (callback &optional remote)
 164   (let ((state-map '((?A . added)
 165                      (?C . conflict)
 166                      (?I . ignored)
 167                      (?M . edited)
 168                      (?D . removed)
 169                      (?R . removed)
 170                      (?? . unregistered)
 171                      ;; This is what vc-svn-parse-status does.
 172                      (?~ . edited)))
 173         (re (if remote "^\\(.\\)......? \\([ *]\\) +\\(?:[-0-9]+\\)?   \\(.*\\)$"
 174               ;; Subexp 2 is a dummy in this case, so the numbers match.
 175               "^\\(.\\)....\\(.\\) \\(.*\\)$"))
 176        result)
 177     (goto-char (point-min))
 178     (while (re-search-forward re nil t)
 179       (let ((state (cdr (assq (aref (match-string 1) 0) state-map)))
 180             (filename (match-string 3)))
 181         (and remote (string-equal (match-string 2) "*")
 182              ;; FIXME are there other possible combinations?
 183              (cond ((eq state 'edited) (setq state 'needs-merge))
 184                    ((not state) (setq state 'needs-update))))
 185         (when (and state (not (string= "." filename)))
 186          (setq result (cons (list filename state) result)))))
 187     (funcall callback result)))
 188
 189 (defun vc-svn-dir-status (dir callback)
 190   "Run 'svn status' for DIR and update BUFFER via CALLBACK.
 191 CALLBACK is called as (CALLBACK RESULT BUFFER), where
 192 RESULT is a list of conses (FILE . STATE) for directory DIR."
 193   ;; FIXME should this rather be all the files in dir?
 194   ;; FIXME: the vc-stay-local-p logic below is disabled, it ends up
 195   ;; calling synchronously (vc-svn-registered DIR) => calling svn status -v DIR
 196   ;; which is VERY SLOW for big trees and it makes emacs
 197   ;; completely unresponsive during that time.
 198   (let* ((local (and nil (vc-stay-local-p dir 'SVN)))
 199          (remote (or t (not local) (eq local 'only-file))))
 200     (vc-svn-command (current-buffer) 'async nil "status"
 201                     (if remote "-u"))
 202   (vc-exec-after
 203      `(vc-svn-after-dir-status (quote ,callback) ,remote))))
 204
 205 (defun vc-svn-dir-status-files (dir files default-state callback)
 206   (apply 'vc-svn-command (current-buffer) 'async nil "status" files)
 207   (vc-exec-after
 208    `(vc-svn-after-dir-status (quote ,callback))))
 209
 210 (defun vc-svn-dir-extra-headers (dir)
 211   "Generate extra status headers for a Subversion working copy."
 212   (let (process-file-side-effects)
 213     (vc-svn-command "*vc*" 0 nil "info"))
 214   (let ((repo
 215          (save-excursion
 216            (and (progn
 217                   (set-buffer "*vc*")
 218                   (goto-char (point-min))
 219                   (re-search-forward "Repository Root: *\\(.*\\)" nil t))
 220                 (match-string 1)))))
 221     (concat
 222      (cond (repo
 223             (concat
 224              (propertize "Repository : " 'face 'font-lock-type-face)
 225              (propertize repo 'face 'font-lock-variable-name-face)))
 226            (t "")))))
 227
 228 (defun vc-svn-working-revision (file)
 229   "SVN-specific version of `vc-working-revision'."
 230   ;; There is no need to consult RCS headers under SVN, because we
 231   ;; get the workfile version for free when we recognize that a file
 232   ;; is registered in SVN.
 233   (vc-svn-registered file)
 234   (vc-file-getprop file 'vc-working-revision))
 235
 236 ;; vc-svn-mode-line-string doesn't exist because the default implementation
 237 ;; works just fine.
 238
 239 (defun vc-svn-previous-revision (file rev)
 240   (let ((newrev (1- (string-to-number rev))))
 241     (when (< 0 newrev)
 242       (number-to-string newrev))))
 243
 244 (defun vc-svn-next-revision (file rev)
 245   (let ((newrev (1+ (string-to-number rev))))
 246     ;; The "working revision" is an uneasy conceptual fit under Subversion;
 247     ;; we use it as the upper bound until a better idea comes along.  If the
 248     ;; workfile version W coincides with the tree's latest revision R, then
 249     ;; this check prevents a "no such revision: R+1" error.  Otherwise, it
 250     ;; inhibits showing of W+1 through R, which could be considered anywhere
 251     ;; from gracious to impolite.
 252     (unless (< (string-to-number (vc-file-getprop file 'vc-working-revision))
 253                newrev)
 254       (number-to-string newrev))))
 255
 256
 257 ;;;
 258 ;;; State-changing functions
 259 ;;;
 260
 261 (defun vc-svn-create-repo ()
 262   "Create a new SVN repository."
 263   (vc-do-command "*vc*" 0 "svnadmin" '("create" "SVN"))
 264   (vc-do-command "*vc*" 0 vc-svn-program '(".")
 265                  "checkout" (concat "file://" default-directory "SVN")))
 266
 267 (defun vc-svn-register (files &optional rev comment)
 268   "Register FILES into the SVN version-control system.
 269 The COMMENT argument is ignored  This does an add but not a commit.
 270 Passes either `vc-svn-register-switches' or `vc-register-switches'
 271 to the SVN command."
 272   (apply 'vc-svn-command nil 0 files "add" (vc-switches 'SVN 'register)))
 273
 274 (defun vc-svn-responsible-p (file)
 275   "Return non-nil if SVN thinks it is responsible for FILE."
 276   (file-directory-p (expand-file-name vc-svn-admin-directory
 277                                       (if (file-directory-p file)
 278                                           file
 279                                         (file-name-directory file)))))
 280
 281 (defalias 'vc-svn-could-register 'vc-svn-responsible-p
 282   "Return non-nil if FILE could be registered in SVN.
 283 This is only possible if SVN is responsible for FILE's directory.")
 284
 285 (defun vc-svn-checkin (files rev comment)
 286   "SVN-specific version of `vc-backend-checkin'."
 287   (if rev (error "Committing to a specific revision is unsupported in SVN"))
 288   (let ((status (apply
 289                  'vc-svn-command nil 1 files "ci"
 290                  (nconc (list "-m" comment) (vc-switches 'SVN 'checkin)))))
 291     (set-buffer "*vc*")
 292     (goto-char (point-min))
 293     (unless (equal status 0)
 294       ;; Check checkin problem.
 295       (cond
 296        ((search-forward "Transaction is out of date" nil t)
 297         (mapc (lambda (file) (vc-file-setprop file 'vc-state 'needs-merge))
 298               files)
 299         (error (substitute-command-keys
 300                 (concat "Up-to-date check failed: "
 301                         "type \\[vc-next-action] to merge in changes"))))
 302        (t
 303         (pop-to-buffer (current-buffer))
 304         (goto-char (point-min))
 305         (shrink-window-if-larger-than-buffer)
 306         (error "Check-in failed"))))
 307     ;; Update file properties
 308     ;; (vc-file-setprop
 309     ;;  file 'vc-working-revision
 310     ;;  (vc-parse-buffer "^\\(new\\|initial\\) revision: \\([0-9.]+\\)" 2))
 311     ))
 312
 313 (defun vc-svn-find-revision (file rev buffer)
 314   "SVN-specific retrieval of a specified version into a buffer."
 315   (let (process-file-side-effects)
 316     (apply 'vc-svn-command
 317            buffer 0 file
 318            "cat"
 319            (and rev (not (string= rev ""))
 320                 (concat "-r" rev))
 321            (vc-switches 'SVN 'checkout))))
 322
 323 (defun vc-svn-checkout (file &optional editable rev)
 324   (message "Checking out %s..." file)
 325   (with-current-buffer (or (get-file-buffer file) (current-buffer))
 326     (vc-svn-update file editable rev (vc-switches 'SVN 'checkout)))
 327   (vc-mode-line file 'SVN)
 328   (message "Checking out %s...done" file))
 329
 330 (defun vc-svn-update (file editable rev switches)
 331   (if (and (file-exists-p file) (not rev))
 332       ;; If no revision was specified, there's nothing to do.
 333       nil
 334     ;; Check out a particular version (or recreate the file).
 335     (vc-file-setprop file 'vc-working-revision nil)
 336     (apply 'vc-svn-command nil 0 file
 337            "--non-interactive"          ; bug#4280
 338            "update"
 339            (cond
 340             ((null rev) "-rBASE")
 341             ((or (eq rev t) (equal rev "")) nil)
 342             (t (concat "-r" rev)))
 343            switches)))
 344
 345 (defun vc-svn-delete-file (file)
 346   (vc-svn-command nil 0 file "remove"))
 347
 348 (defun vc-svn-rename-file (old new)
 349   (vc-svn-command nil 0 new "move" (file-relative-name old)))
 350
 351 (defun vc-svn-revert (file &optional contents-done)
 352   "Revert FILE to the version it was based on."
 353   (unless contents-done
 354     (vc-svn-command nil 0 file "revert")))
 355
 356 (defun vc-svn-merge (file first-version &optional second-version)
 357   "Merge changes into current working copy of FILE.
 358 The changes are between FIRST-VERSION and SECOND-VERSION."
 359   (vc-svn-command nil 0 file
 360                  "merge"
 361                  "-r" (if second-version
 362                         (concat first-version ":" second-version)
 363                       first-version))
 364   (vc-file-setprop file 'vc-state 'edited)
 365   (with-current-buffer (get-buffer "*vc*")
 366     (goto-char (point-min))
 367     (if (looking-at "C  ")
 368         1                               ; signal conflict
 369       0)))                              ; signal success
 370
 371 (defun vc-svn-merge-news (file)
 372   "Merge in any new changes made to FILE."
 373   (message "Merging changes into %s..." file)
 374   ;; (vc-file-setprop file 'vc-working-revision nil)
 375   (vc-file-setprop file 'vc-checkout-time 0)
 376   (vc-svn-command nil 0 file "--non-interactive" "update") ; see bug#7152
 377   ;; Analyze the merge result reported by SVN, and set
 378   ;; file properties accordingly.
 379   (with-current-buffer (get-buffer "*vc*")
 380     (goto-char (point-min))
 381     ;; get new working revision
 382     (if (re-search-forward
 383          "^\\(Updated to\\|At\\) revision \\([0-9]+\\)" nil t)
 384         (vc-file-setprop file 'vc-working-revision (match-string 2))
 385       (vc-file-setprop file 'vc-working-revision nil))
 386     ;; get file status
 387     (goto-char (point-min))
 388     (prog1
 389         (if (looking-at "At revision")
 390             0 ;; there were no news; indicate success
 391           (if (re-search-forward
 392                ;; Newer SVN clients have 3 columns of chars (one for the
 393                ;; file's contents, then second for its properties, and the
 394                ;; third for lock-grabbing info), before the 2 spaces.
 395                ;; We also used to match the filename in column 0 without any
 396                ;; meta-info before it, but I believe this can never happen.
 397                (concat "^\\(\\([ACGDU]\\)\\(.[B ]\\)?  \\)"
 398                        (regexp-quote (file-name-nondirectory file)))
 399                nil t)
 400               (cond
 401                ;; Merge successful, we are in sync with repository now
 402                ((string= (match-string 2) "U")
 403                 (vc-file-setprop file 'vc-state 'up-to-date)
 404                 (vc-file-setprop file 'vc-checkout-time
 405                                  (nth 5 (file-attributes file)))
 406                 0);; indicate success to the caller
 407                ;; Merge successful, but our own changes are still in the file
 408                ((string= (match-string 2) "G")
 409                 (vc-file-setprop file 'vc-state 'edited)
 410                 0);; indicate success to the caller
 411                ;; Conflicts detected!
 412                (t
 413                 (vc-file-setprop file 'vc-state 'edited)
 414                 1);; signal the error to the caller
 415                )
 416             (pop-to-buffer "*vc*")
 417             (error "Couldn't analyze svn update result")))
 418       (message "Merging changes into %s...done" file))))
 419
 420 (defun vc-svn-modify-change-comment (files rev comment)
 421   "Modify the change comments for a specified REV.
 422 You must have ssh access to the repository host, and the directory Emacs
 423 uses locally for temp files must also be writable by you on that host.
 424 This is only supported if the repository access method is either file://
 425 or svn+ssh://."
 426   (let (tempfile host remotefile directory fileurl-p)
 427     (with-temp-buffer
 428       (vc-do-command (current-buffer) 0 vc-svn-program nil "info")
 429       (goto-char (point-min))
 430       (unless (re-search-forward "Repository Root: \\(file://\\(/.*\\)\\)\\|\\(svn\\+ssh://\\([^/]+\\)\\(/.*\\)\\)" nil t)
 431         (error "Repository information is unavailable"))
 432       (if (match-string 1)
 433           (progn
 434             (setq fileurl-p t)
 435             (setq directory (match-string 2)))
 436         (setq host (match-string 4))
 437         (setq directory (match-string 5))
 438         (setq remotefile (concat host ":" tempfile))))
 439     (with-temp-file (setq tempfile (make-temp-file user-mail-address))
 440       (insert comment))
 441     (if fileurl-p
 442         ;; Repository Root is a local file.
 443         (progn
 444           (unless (vc-do-command
 445                    "*vc*" 0 "svnadmin" nil
 446                    "setlog" "--bypass-hooks" directory
 447                    "-r" rev (format "%s" tempfile))
 448             (error "Log edit failed"))
 449           (delete-file tempfile))
 450
 451       ;; Remote repository, using svn+ssh.
 452       (unless (vc-do-command "*vc*" 0 "scp" nil "-q" tempfile remotefile)
 453         (error "Copy of comment to %s failed" remotefile))
 454       (unless (vc-do-command
 455                "*vc*" 0 "ssh" nil "-q" host
 456                (format "svnadmin setlog --bypass-hooks %s -r %s %s; rm %s"
 457                        directory rev tempfile tempfile))
 458         (error "Log edit failed")))))
 459
 460 ;;;
 461 ;;; History functions
 462 ;;;
 463
 464 (defvar log-view-per-file-logs)
 465
 466 (define-derived-mode vc-svn-log-view-mode log-view-mode "SVN-Log-View"
 467   (require 'add-log)
 468   (set (make-local-variable 'log-view-per-file-logs) nil))
 469
 470 (defun vc-svn-print-log (files buffer &optional shortlog start-revision limit)
 471   "Get change log(s) associated with FILES."
 472   (save-current-buffer
 473     (vc-setup-buffer buffer)
 474     (let ((inhibit-read-only t))
 475       (goto-char (point-min))
 476       (if files
 477           (dolist (file files)
 478                   (insert "Working file: " file "\n")
 479                   (apply
 480                    'vc-svn-command
 481                    buffer
 482                    'async
 483                    ;; (if (and (= (length files) 1) (vc-stay-local-p file 'SVN)) 'async 0)
 484                    (list file)
 485                    "log"
 486                    (append
 487                     (list
 488                      (if start-revision
 489                          (format "-r%s" start-revision)
 490                        ;; By default Subversion only shows the log up to the
 491                        ;; working revision, whereas we also want the log of the
 492                        ;; subsequent commits.  At least that's what the
 493                        ;; vc-cvs.el code does.
 494                        "-rHEAD:0"))
 495                     (when limit (list "--limit" (format "%s" limit))))))
 496         ;; Dump log for the entire directory.
 497         (apply 'vc-svn-command buffer 0 nil "log"
 498                (append
 499                 (list
 500                  (if start-revision (format "-r%s" start-revision) "-rHEAD:0"))
 501                 (when limit (list "--limit" (format "%s" limit)))))))))
 502
 503 (defun vc-svn-diff (files &optional oldvers newvers buffer)
 504   "Get a difference report using SVN between two revisions of fileset FILES."
 505   (and oldvers
 506        (not newvers)
 507        files
 508        (catch 'no
 509          (dolist (f files)
 510            (or (equal oldvers (vc-working-revision f))
 511                (throw 'no nil)))
 512          t)
 513        ;; Use nil rather than the current revision because svn handles
 514        ;; it better (i.e. locally).  Note that if _any_ of the files
 515        ;; has a different revision, we fetch the lot, which is
 516        ;; obviously sub-optimal.
 517        (setq oldvers nil))
 518   (let* ((switches
 519             (if vc-svn-diff-switches
 520                 (vc-switches 'SVN 'diff)
 521               (list "--diff-cmd=diff" "-x"
 522                     (mapconcat 'identity (vc-switches nil 'diff) " "))))
 523            (async (and (not vc-disable-async-diff)
 524                        (vc-stay-local-p files 'SVN)
 525                        (or oldvers newvers)))) ; Svn diffs those locally.
 526       (apply 'vc-svn-command buffer
 527              (if async 'async 0)
 528              files "diff"
 529              (append
 530               switches
 531               (when oldvers
 532                 (list "-r" (if newvers (concat oldvers ":" newvers)
 533                              oldvers)))))
 534       (if async 1                     ; async diff => pessimistic assumption
 535         ;; For some reason `svn diff' does not return a useful
 536         ;; status w.r.t whether the diff was empty or not.
 537         (buffer-size (get-buffer buffer)))))
 538
 539 ;;;
 540 ;;; Tag system
 541 ;;;
 542
 543 (defun vc-svn-create-tag (dir name branchp)
 544   "Assign to DIR's current revision a given NAME.
 545 If BRANCHP is non-nil, the name is created as a branch (and the current
 546 workspace is immediately moved to that new branch).
 547 NAME is assumed to be a URL."
 548   (vc-svn-command nil 0 dir "copy" name)
 549   (when branchp (vc-svn-retrieve-tag dir name nil)))
 550
 551 (defun vc-svn-retrieve-tag (dir name update)
 552   "Retrieve a tag at and below DIR.
 553 NAME is the name of the tag; if it is empty, do a `svn update'.
 554 If UPDATE is non-nil, then update (resynch) any affected buffers.
 555 NAME is assumed to be a URL."
 556   (vc-svn-command nil 0 dir "switch" name)
 557   ;; FIXME: parse the output and obey `update'.
 558   )
 559
 560 ;;;
 561 ;;; Miscellaneous
 562 ;;;
 563
 564 ;; Subversion makes backups for us, so don't bother.
 565 ;; (defun vc-svn-make-version-backups-p (file)
 566 ;;   "Return non-nil if version backups should be made for FILE."
 567 ;;  (vc-stay-local-p file 'SVN))
 568
 569 (defun vc-svn-check-headers ()
 570   "Check if the current file has any headers in it."
 571   (save-excursion
 572     (goto-char (point-min))
 573     (re-search-forward "\\$[A-Za-z\300-\326\330-\366\370-\377]+\
 574 \\(: [\t -#%-\176\240-\377]*\\)?\\$" nil t)))
 575
 576
 577 ;;;
 578 ;;; Internal functions
 579 ;;;
 580
 581 (defun vc-svn-command (buffer okstatus file-or-list &rest flags)
 582   "A wrapper around `vc-do-command' for use in vc-svn.el.
 583 The difference to vc-do-command is that this function always invokes `svn',
 584 and that it passes `vc-svn-global-switches' to it before FLAGS."
 585   (apply 'vc-do-command (or buffer "*vc*") okstatus vc-svn-program file-or-list
 586          (if (stringp vc-svn-global-switches)
 587              (cons vc-svn-global-switches flags)
 588            (append vc-svn-global-switches
 589                    flags))))
 590
 591 (defun vc-svn-repository-hostname (dirname)
 592   (with-temp-buffer
 593     (let ((coding-system-for-read
 594            (or file-name-coding-system
 595                default-file-name-coding-system)))
 596       (vc-insert-file (expand-file-name (concat vc-svn-admin-directory
 597                                                 "/entries")
 598                                         dirname)))
 599     (goto-char (point-min))
 600     (when (re-search-forward
 601            ;; Old `svn' used name="svn:this_dir", newer use just name="".
 602            (concat "name=\"\\(?:svn:this_dir\\)?\"[\n\t ]*"
 603                    "\\(?:[-a-z]+=\"[^\"]*\"[\n\t ]*\\)*?"
 604                    "url=\"\\(?1:[^\"]+\\)\""
 605                    ;; Yet newer ones don't use XML any more.
 606                    "\\|^\ndir\n[0-9]+\n\\(?1:.*\\)") nil t)
 607       ;; This is not a hostname but a URL.  This may actually be considered
 608       ;; as a feature since it allows vc-svn-stay-local to specify different
 609       ;; behavior for different modules on the same server.
 610       (match-string 1))))
 611
 612 (defun vc-svn-resolve-when-done ()
 613   "Call \"svn resolved\" if the conflict markers have been removed."
 614   (save-excursion
 615     (goto-char (point-min))
 616     (unless (re-search-forward "^<<<<<<< " nil t)
 617       (vc-svn-command nil 0 buffer-file-name "resolved")
 618       ;; Remove the hook so that it is not called multiple times.
 619       (remove-hook 'after-save-hook 'vc-svn-resolve-when-done t))))
 620
 621 ;; Inspired by vc-arch-find-file-hook.
 622 (defun vc-svn-find-file-hook ()
 623   (when (eq ?C (vc-file-getprop buffer-file-name 'vc-svn-status))
 624     ;; If the file is marked as "conflicted", then we should try and call
 625     ;; "svn resolved" when applicable.
 626     (if (save-excursion
 627           (goto-char (point-min))
 628           (re-search-forward "^<<<<<<< " nil t))
 629         ;; There are conflict markers.
 630         (progn
 631           (smerge-start-session)
 632           (add-hook 'after-save-hook 'vc-svn-resolve-when-done nil t))
 633       ;; There are no conflict markers.  This is problematic: maybe it means
 634       ;; the conflict has been resolved and we should immediately call "svn
 635       ;; resolved", or it means that the file's type does not allow Svn to
 636       ;; use conflict markers in which case we don't really know what to do.
 637       ;; So let's just punt for now.
 638       nil)
 639     (message "There are unresolved conflicts in this file")))
 640
 641 (defun vc-svn-parse-status (&optional filename)
 642   "Parse output of \"svn status\" command in the current buffer.
 643 Set file properties accordingly.  Unless FILENAME is non-nil, parse only
 644 information about FILENAME and return its status."
 645   (let (file status)
 646     (goto-char (point-min))
 647     (while (re-search-forward
 648             ;; Ignore the files with status X.
 649             "^\\(?:\\?\\|[ ACDGIMR!~][ MC][ L][ +][ S]..\\([ *]\\) +\\([-0-9]+\\) +\\([0-9?]+\\) +\\([^ ]+\\)\\) +" nil t)
 650       ;; If the username contains spaces, the output format is ambiguous,
 651       ;; so don't trust the output's filename unless we have to.
 652       (setq file (or filename
 653                      (expand-file-name
 654                       (buffer-substring (point) (line-end-position)))))
 655       (setq status (char-after (line-beginning-position)))
 656       (if (eq status ??)
 657           (vc-file-setprop file 'vc-state 'unregistered)
 658         ;; Use the last-modified revision, so that searching in vc-print-log
 659         ;; output works.
 660         (vc-file-setprop file 'vc-working-revision (match-string 3))
 661         ;; Remember Svn's own status.
 662         (vc-file-setprop file 'vc-svn-status status)
 663         (vc-file-setprop
 664          file 'vc-state
 665          (cond
 666           ((eq status ?\ )
 667            (if (eq (char-after (match-beginning 1)) ?*)
 668                'needs-update
 669              (vc-file-setprop file 'vc-checkout-time
 670                               (nth 5 (file-attributes file)))
 671              'up-to-date))
 672           ((eq status ?A)
 673            ;; If the file was actually copied, (match-string 2) is "-".
 674            (vc-file-setprop file 'vc-working-revision "0")
 675            (vc-file-setprop file 'vc-checkout-time 0)
 676            'added)
 677           ((eq status ?C)
 678            (vc-file-setprop file 'vc-state 'conflict))
 679           ((eq status '?M)
 680            (if (eq (char-after (match-beginning 1)) ?*)
 681                'needs-merge
 682              'edited))
 683           ((eq status ?I)
 684            (vc-file-setprop file 'vc-state 'ignored))
 685           ((memq status '(?D ?R))
 686            (vc-file-setprop file 'vc-state 'removed))
 687           (t 'edited)))))
 688     (when filename (vc-file-getprop filename 'vc-state))))
 689
 690 (defun vc-svn-valid-symbolic-tag-name-p (tag)
 691   "Return non-nil if TAG is a valid symbolic tag name."
 692   ;; According to the SVN manual, a valid symbolic tag must start with
 693   ;; an uppercase or lowercase letter and can contain uppercase and
 694   ;; lowercase letters, digits, `-', and `_'.
 695   (and (string-match "^[a-zA-Z]" tag)
 696        (not (string-match "[^a-z0-9A-Z-_]" tag))))
 697
 698 (defun vc-svn-valid-revision-number-p (tag)
 699   "Return non-nil if TAG is a valid revision number."
 700   (and (string-match "^[0-9]" tag)
 701        (not (string-match "[^0-9]" tag))))
 702
 703 ;; Support for `svn annotate'
 704
 705 (defun vc-svn-annotate-command (file buf &optional rev)
 706   (vc-svn-command buf 'async file "annotate" (if rev (concat "-r" rev))))
 707
 708 (defun vc-svn-annotate-time-of-rev (rev)
 709   ;; Arbitrarily assume 10 commmits per day.
 710   (/ (string-to-number rev) 10.0))
 711
 712 (defvar vc-annotate-parent-rev)
 713
 714 (defun vc-svn-annotate-current-time ()
 715   (vc-svn-annotate-time-of-rev vc-annotate-parent-rev))
 716
 717 (defconst vc-svn-annotate-re "[ \t]*\\([0-9]+\\)[ \t]+[^\t ]+ ")
 718
 719 (defun vc-svn-annotate-time ()
 720   (when (looking-at vc-svn-annotate-re)
 721     (goto-char (match-end 0))
 722     (vc-svn-annotate-time-of-rev (match-string 1))))
 723
 724 (defun vc-svn-annotate-extract-revision-at-line ()
 725   (save-excursion
 726     (beginning-of-line)
 727     (if (looking-at vc-svn-annotate-re) (match-string 1))))
 728
 729 (defun vc-svn-revision-table (files)
 730   (let ((vc-svn-revisions '()))
 731     (with-current-buffer "*vc*"
 732       (vc-svn-command nil 0 files "log" "-q")
 733       (goto-char (point-min))
 734       (forward-line)
 735       (let ((start (point-min))
 736             (loglines (buffer-substring-no-properties (point-min)
 737                                                       (point-max))))
 738         (while (string-match "^r\\([0-9]+\\) " loglines)
 739           (push (match-string 1 loglines) vc-svn-revisions)
 740           (setq start (+ start (match-end 0)))
 741           (setq loglines (buffer-substring-no-properties start (point-max)))))
 742     vc-svn-revisions)))
 743
 744 (provide 'vc-svn)
 745
 746 ;; arch-tag: 02f10c68-2b4d-453a-90fc-1eee6cfb268d
 747 ;;; vc-svn.el ends here