First cut at vc-svn.el.

2 files changed, 690 insertions, 2 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 2b1f04dbd84..dc91744f090 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,7 +1,30 @@
+2003-05-05  Stefan Monnier  <monnier@cs.yale.edu>
+
+        * vc-svn.el: New file.
+
 2003-05-05  John Paul Wallington  <jpw@gnu.org>
 
-        * emacs-lisp/autoload.el (batch-update-autoloads): Call
-        `update-directory-autoloads'.
+        * emacs-lisp/autoload.el (batch-update-autoloads):
+        Call `update-directory-autoloads'.
+
+2003-05-04  Stefan Monnier  <monnier@cs.yale.edu>
+
+        * uniquify.el: Move provide to end of file.
+        (uniquify-ref-base, uniquify-ref-filename, uniquify-ref-buffer)
+        (uniquify-ref-proposed, uniquify-set-proposed): Remove.
+        (uniquify-item): New struct.  Update users of uniquify-ref-*.
+        (uniquify-get-proposed-name, uniquify-rationalize-a-list):
+        Make `depth' optional.
+        (uniquify-non-file-buffer-names): Remove.
+        (uniquify-rationalize-file-buffer-names): Don't set it up.
+        Use uniquify-make-item and don't pass the now-optional depth.
+        (uniquify-rationalize-conflicting-sublist): Check the new buffer
+        name directly instead of relying on uniquify-non-file-buffer-names.
+        (uniquify-rename-buffer): Use with-current-buffer and pass
+        the `unique' arg to rename-buffer.
+
+        * vc-mcvs.el (vc-mcvs-mode-line-string): Fix thinko.
+        (vc-mcvs-rename-file): New function.
 
 2003-05-04  Emmanuel Briot  <briot@gnat.com>
 
@@ -21,6 +44,20 @@
         toolbar/gud-run.pbm, toolbar/gud-step.pbm, toolbar/gud-up.pbm:
         Correct size for cleaner bitmaps.
 
+2003-05-03  Stefan Monnier  <monnier@cs.yale.edu>
+
+        * emacs-lisp/cl-extra.el (cl-map-keymap): Redefine as alias.
+        (cl-map-keymap-recursively): Use map-keymap.
+        (cl-macroexpand-all): Don't quote functions.
+
+        * emacs-lisp/lucid.el (cl-map-keymap): Be careful with aliases.
+
+        * emacs-lisp/advice.el (ad-get-enabled-advices, ad-special-forms)
+        (ad-arglist, ad-subr-arglist): Use push and match-string.
+        (ad-make-advised-docstring): Extract & reinsert the usage info.
+
+        * help-fns.el (help-add-fundoc-usage): Allow arglist to be a string.
+
 2003-05-03  Nick Roberts  <nick@nick.uklinux.net>
 
         * gdb-ui.el (breakpoint-enabled-icon, breakpoint-disabled-icon):
@@ -62,6 +99,13 @@
 
 2003-04-30  Stefan Monnier  <monnier@cs.yale.edu>
 
+        * pcvs.el (cvs-vc-command-advice): Don't parse "cvs update -p" output.
+        (cvs-mode-find-file): Don't complain if bound to a non-mouse event.
+
+        * textmodes/fill.el (text-property-default-nonsticky): Add fill-space.
+        (fill-delete-newlines): Respect the new property.
+        (fill-newline): Use the property instead of leaving "spurious" spaces.
+
         * emacs-lisp/easymenu.el (easy-menu-get-map): Correctly handle
         non-submap bindings.
 
diff --git a/lisp/vc-svn.el b/lisp/vc-svn.el
new file mode 100644
index 00000000000..780b71746ce
--- /dev/null
+++ b/lisp/vc-svn.el
@@ -0,0 +1,644 @@
+;;; vc-svn.el --- non-resident support for Subversion version-control
+
+;; Copyright (C) 1995,98,99,2000,2001,2002  Free Software Foundation, Inc.
+
+;; Author:      FSF (see vc.el for full credits)
+;; Maintainer:  Stefan Monnier <monnier@gnu.org>
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This is preliminary support for Subversion (http://subversion.tigris.org/).
+;; It started as `sed s/cvs/svn/ vc.cvs.el' (from version 1.56)
+;; and hasn't been completely fixed since.
+
+;; Sync'd with Subversion's vc-svn.el as of revision 5801.
+
+;;; Bugs:
+
+;; - VC-dired is either not working or (really) dog slow.
+;; - vc-print-log does not always jump to the proper log entry because
+;;   it tries to jump to version 1234 even if there's only an entry
+;;   for 1232 (because the file hasn't changed since).
+
+;;; Code:
+
+(eval-when-compile
+  (require 'vc))
+
+;;;
+;;; Customization options
+;;;
+
+(defcustom vc-svn-global-switches nil
+  "*Global switches to pass to any SVN command."
+  :type '(choice (const :tag "None" nil)
+                 (string :tag "Argument String")
+                 (repeat :tag "Argument List"
+                         :value ("")
+                         string))
+  :version "21.4"
+  :group 'vc)
+
+(defcustom vc-svn-register-switches nil
+  "*Extra switches for registering a file into SVN.
+A string or list of strings passed to the checkin program by
+\\[vc-register]."
+  :type '(choice (const :tag "None" nil)
+                 (string :tag "Argument String")
+                 (repeat :tag "Argument List"
+                         :value ("")
+                         string))
+  :version "21.1"
+  :group 'vc)
+
+(defcustom vc-svn-diff-switches nil
+  "*A string or list of strings specifying extra switches for svn diff under VC."
+    :type '(choice (const :tag "None" nil)
+                 (string :tag "Argument String")
+                 (repeat :tag "Argument List"
+                         :value ("")
+                         string))
+  :version "21.1"
+  :group 'vc)
+
+(defcustom vc-svn-header (or (cdr (assoc 'SVN vc-header-alist)) '("\$Id\$"))
+  "*Header keywords to be inserted by `vc-insert-headers'."
+  :version "21.1"
+  :type '(repeat string)
+  :group 'vc)
+
+(defcustom vc-svn-use-edit nil
+  "*Non-nil means to use `svn edit' to \"check out\" a file.
+This is only meaningful if you don't use the implicit checkout model
+\(i.e. if you have $SVNREAD set)."
+  :type 'boolean
+  :version "21.1"
+  :group 'vc)
+
+(defcustom vc-svn-stay-local t
+  "*Non-nil means use local operations when possible for remote repositories.
+This avoids slow queries over the network and instead uses heuristics
+and past information to determine the current status of a file.
+
+The value can also be a regular expression or list of regular
+expressions to match against the host name of a repository; then VC
+only stays local for hosts that match it.  Alternatively, the value
+can be a list of regular expressions where the first element is the 
+symbol `except'; then VC always stays local except for hosts matched 
+by these regular expressions."
+  :type '(choice (const :tag "Always stay local" t)
+                (const :tag "Don't stay local" nil)
+                 (list :format "\nExamine hostname and %v" :tag "Examine hostname ..." 
+                       (set :format "%v" :inline t (const :format "%t" :tag "don't" except))
+                       (regexp :format " stay local,\n%t: %v" :tag "if it matches")
+                       (repeat :format "%v%i\n" :inline t (regexp :tag "or"))))
+  :version "21.1"
+  :group 'vc)
+
+;;;
+;;; State-querying functions
+;;;
+
+;;;###autoload (defun vc-svn-registered (f)
+;;;###autoload   (when (file-readable-p (expand-file-name
+;;;###autoload                    ".svn/entries" (file-name-directory f)))
+;;;###autoload       (load "vc-svn")
+;;;###autoload       (vc-svn-registered f)))
+
+(defun vc-svn-registered (file)
+  "Check if FILE is SVN registered."
+  (when (file-readable-p (expand-file-name ".svn/entries"
+                                           (file-name-directory file)))
+    (with-temp-buffer
+      (cd (file-name-directory file))
+      (condition-case nil
+          (vc-svn-command t 0 file "status" "-v")
+        ;; We can't find an `svn' executable.  We could also deregister SVN.
+        (file-error nil)
+      (vc-svn-parse-status t)
+      (eq 'SVN (vc-file-getprop file 'vc-backend)))))
+
+(defun vc-svn-state (file &optional localp)
+  "SVN-specific version of `vc-state'."
+  (setq localp (or localp (vc-svn-stay-local-p file)))
+  (with-temp-buffer
+    (cd (file-name-directory file))
+    (vc-svn-command t 0 file "status" (if localp "-v" "-u"))
+    (vc-svn-parse-status localp)
+    (vc-file-getprop file 'vc-state)))
+
+(defun vc-svn-state-heuristic (file)
+  "SVN-specific state heuristic."
+  (vc-svn-state file 'local))
+
+(defun vc-svn-dir-state (dir &optional localp)
+  "Find the SVN state of all files in DIR."
+  (setq localp (or localp (vc-svn-stay-local-p dir)))
+  (let ((default-directory dir))
+    ;; Don't specify DIR in this command, the default-directory is
+    ;; enough.  Otherwise it might fail with remote repositories.
+    (with-temp-buffer
+      (vc-svn-command t 0 nil "status" (if localp "-v" "-u"))
+      (vc-svn-parse-status localp))))
+
+(defun vc-svn-workfile-version (file)
+  "SVN-specific version of `vc-workfile-version'."
+  ;; There is no need to consult RCS headers under SVN, because we
+  ;; get the workfile version for free when we recognize that a file
+  ;; is registered in SVN.
+  (vc-svn-registered file)
+  (vc-file-getprop file 'vc-workfile-version))
+
+(defun vc-svn-checkout-model (file)
+  "SVN-specific version of `vc-checkout-model'."
+  ;; It looks like Subversion has no equivalent of CVSREAD.
+  'implicit)
+
+(defun vc-svn-mode-line-string (file)
+  "Return string for placement into the modeline for FILE.
+Compared to the default implementation, this function does two things:
+Handle the special case of a SVN file that is added but not yet
+committed and support display of sticky tags."
+  (let* ((state   (vc-state file))
+         (rev     (vc-workfile-version file))
+         (sticky-tag (vc-file-getprop file 'vc-svn-sticky-tag))
+         (sticky-tag-printable (and sticky-tag
+                                    (not (string= sticky-tag ""))
+                                    (concat "[" sticky-tag "]"))))
+    (cond ((string= rev "0")
+           ;; A file that is added but not yet committed.
+           "SVN @@")
+          ((or (eq state 'up-to-date)
+               (eq state 'needs-patch))
+           (concat "SVN-" rev sticky-tag-printable))
+          ((stringp state)
+           (concat "SVN:" state ":" rev sticky-tag-printable))
+          (t
+           ;; Not just for the 'edited state, but also a fallback
+           ;; for all other states.  Think about different symbols
+           ;; for 'needs-patch and 'needs-merge.
+           (concat "SVN:" rev sticky-tag-printable)))))
+
+(defun vc-svn-dired-state-info (file)
+  "SVN-specific version of `vc-dired-state-info'."
+  (let* ((svn-state (vc-state file))
+         (state (cond ((eq svn-state 'edited)   "modified")
+                      ((eq svn-state 'needs-patch)      "patch")
+                      ((eq svn-state 'needs-merge)      "merge")
+                      ;; FIXME: those two states cannot occur right now
+                      ((eq svn-state 'unlocked-changes) "conflict")
+                      ((eq svn-state 'locally-added)    "added")
+                      )))
+    (if state (concat "(" state ")"))))
+
+
+;;;
+;;; State-changing functions
+;;;
+
+(defun vc-svn-register (file &optional rev comment)
+  "Register FILE into the SVN version-control system.
+COMMENT can be used to provide an initial description of FILE.
+
+`vc-register-switches' and `vc-svn-register-switches' are passed to
+the SVN command (in that order)."
+  (let ((switches (append
+                   (if (stringp vc-register-switches)
+                       (list vc-register-switches)
+                     vc-register-switches)
+                   (if (stringp vc-svn-register-switches)
+                       (list vc-svn-register-switches)
+                     vc-svn-register-switches))))
+
+    (apply 'vc-svn-command nil 0 file
+           "add"
+           ;; (and comment (string-match "[^\t\n ]" comment)
+           ;;   (concat "-m" comment))
+           switches)))
+
+(defun vc-svn-responsible-p (file)
+  "Return non-nil if SVN thinks it is responsible for FILE."
+  (file-directory-p (expand-file-name ".svn"
+                                      (if (file-directory-p file)
+                                          file
+                                        (file-name-directory file)))))
+
+(defalias 'vc-svn-could-register 'vc-svn-responsible-p
+  "Return non-nil if FILE could be registered in SVN.
+This is only possible if SVN is responsible for FILE's directory.")
+
+(defun vc-svn-checkin (file rev comment)
+  "SVN-specific version of `vc-backend-checkin'."
+  (let ((switches (if (stringp vc-checkin-switches)
+                      (list vc-checkin-switches)
+                    vc-checkin-switches))
+        status)
+    (setq status (apply 'vc-svn-command nil 1 file
+                        "ci" (list* "-m" comment switches)))
+    (set-buffer "*vc*")
+    (goto-char (point-min))
+    (unless (equal status 0)
+      ;; Check checkin problem.
+      (cond
+       ((re-search-forward "Up-to-date check failed" nil t)
+        (vc-file-setprop file 'vc-state 'needs-merge)
+        (error (substitute-command-keys
+                (concat "Up-to-date check failed: "
+                        "type \\[vc-next-action] to merge in changes"))))
+       (t
+        (pop-to-buffer (current-buffer))
+        (goto-char (point-min))
+        (shrink-window-if-larger-than-buffer)
+        (error "Check-in failed"))))
+    ;; Update file properties
+    ;; (vc-file-setprop
+    ;;  file 'vc-workfile-version
+    ;;  (vc-parse-buffer "^\\(new\\|initial\\) revision: \\([0-9.]+\\)" 2))
+    ))
+
+(defun vc-svn-find-version (file rev buffer)
+  (apply 'vc-svn-command
+         buffer 0 file
+         "cat"
+         (and rev (not (string= rev ""))
+              (concat "-r" rev))
+         (if (stringp vc-checkout-switches)
+             (list vc-checkout-switches)
+           vc-checkout-switches)))
+
+(defun vc-svn-checkout (file &optional editable rev)
+  (message "Checking out %s..." file)
+  (with-current-buffer (or (get-file-buffer file) (current-buffer))
+    (let ((switches (if (stringp vc-checkout-switches)
+                        (list vc-checkout-switches)
+                      vc-checkout-switches)))
+      (vc-call update file editable rev switches)))
+  (vc-mode-line file)
+  (message "Checking out %s...done" file))
+
+(defun vc-svn-update (file editable rev switches)
+  (if (and (file-exists-p file) (not rev))
+      ;; If no revision was specified, just make the file writable
+      ;; if necessary (using `svn-edit' if requested).
+      (and editable (not (eq (vc-svn-checkout-model file) 'implicit))
+           (if vc-svn-use-edit
+               (vc-svn-command nil 0 file "edit")
+             (set-file-modes file (logior (file-modes file) 128))
+             (if (equal file buffer-file-name) (toggle-read-only -1))))
+    ;; Check out a particular version (or recreate the file).
+    (vc-file-setprop file 'vc-workfile-version nil)
+    (apply 'vc-svn-command nil 0 file
+           "-w"
+           "update"
+           ;; default for verbose checkout: clear the sticky tag so
+           ;; that the actual update will get the head of the trunk
+           (if (or (not rev) (string= rev ""))
+               "-A"
+             (concat "-r" rev))
+           switches)))
+
+(defun vc-svn-revert (file &optional contents-done)
+  "Revert FILE to the version it was based on."
+  (unless contents-done
+    (vc-svn-command nil 0 file "revert"))
+  (unless (eq (vc-checkout-model file) 'implicit)
+    (if vc-svn-use-edit
+        (vc-svn-command nil 0 file "unedit")
+      ;; Make the file read-only by switching off all w-bits
+      (set-file-modes file (logand (file-modes file) 3950)))))
+
+(defun vc-svn-merge (file first-version &optional second-version)
+  "Merge changes into current working copy of FILE.
+The changes are between FIRST-VERSION and SECOND-VERSION."
+  (vc-svn-command nil 0 file
+                 "update" "-kk"
+                 (concat "-j" first-version)
+                 (concat "-j" second-version))
+  (vc-file-setprop file 'vc-state 'edited)
+  (with-current-buffer (get-buffer "*vc*")
+    (goto-char (point-min))
+    (if (re-search-forward "conflicts during merge" nil t)
+        1                               ; signal error
+      0)))                              ; signal success
+
+(defun vc-svn-merge-news (file)
+  "Merge in any new changes made to FILE."
+  (message "Merging changes into %s..." file)
+  ;; (vc-file-setprop file 'vc-workfile-version nil)
+  (vc-file-setprop file 'vc-checkout-time 0)
+  (vc-svn-command nil 0 file "update")
+  ;; Analyze the merge result reported by SVN, and set
+  ;; file properties accordingly.
+  (with-current-buffer (get-buffer "*vc*")
+    (goto-char (point-min))
+    ;; get new workfile version
+    (if (re-search-forward
+         "^Merging differences between [0-9.]* and \\([0-9.]*\\) into" nil t)
+        (vc-file-setprop file 'vc-workfile-version (match-string 1))
+      (vc-file-setprop file 'vc-workfile-version nil))
+    ;; get file status
+    (prog1
+        (if (eq (buffer-size) 0)
+            0 ;; there were no news; indicate success
+          (if (re-search-forward
+               (concat "^\\([CMUP] \\)?"
+                       (regexp-quote (file-name-nondirectory file))
+                       "\\( already contains the differences between \\)?")
+               nil t)
+              (cond
+               ;; Merge successful, we are in sync with repository now
+               ((or (match-string 2)
+                    (string= (match-string 1) "U ")
+                    (string= (match-string 1) "P "))
+                (vc-file-setprop file 'vc-state 'up-to-date)
+                (vc-file-setprop file 'vc-checkout-time
+                                 (nth 5 (file-attributes file)))
+                0);; indicate success to the caller
+               ;; Merge successful, but our own changes are still in the file
+               ((string= (match-string 1) "M ")
+                (vc-file-setprop file 'vc-state 'edited)
+                0);; indicate success to the caller
+               ;; Conflicts detected!
+               (t
+                (vc-file-setprop file 'vc-state 'edited)
+                1);; signal the error to the caller
+               )
+            (pop-to-buffer "*vc*")
+            (error "Couldn't analyze svn update result")))
+      (message "Merging changes into %s...done" file))))
+
+
+;;;
+;;; History functions
+;;;
+
+(defun vc-svn-print-log (file)
+  "Get change log associated with FILE."
+  (save-current-buffer
+    (vc-setup-buffer nil)
+    (let ((inhibit-read-only t))
+      (goto-char (point-min))
+      ;; Add a line to tell log-view-mode what file this is.
+      (insert "Working file: " (file-relative-name file) "\n"))
+    (vc-svn-command
+     t
+     (if (and (vc-svn-stay-local-p file) (fboundp 'start-process)) 'async 0)
+     file "log")))
+
+(defun vc-svn-diff (file &optional oldvers newvers)
+  "Get a difference report using SVN between two versions of FILE."
+  (let (status (diff-switches-list (vc-diff-switches-list 'SVN)))
+    (if (string= (vc-workfile-version file) "0")
+        ;; This file is added but not yet committed; there is no master file.
+        (if (or oldvers newvers)
+            (error "No revisions of %s exist" file)
+          ;; We regard this as "changed".
+          ;; Diff it against /dev/null.
+          ;; Note: this is NOT a "svn diff".
+          (apply 'vc-do-command "*vc-diff*"
+                 1 "diff" file
+                 (append diff-switches-list '("/dev/null"))))
+      (setq status
+            (apply 'vc-svn-command "*vc-diff*"
+                   (if (and (vc-svn-stay-local-p file)
+                            (or oldvers newvers) ; Svn diffs those locally.
+                            (fboundp 'start-process))
+                       'async
+                     1)
+                   file "diff"
+                   (append
+                    (when oldvers
+                      (list "-r"
+                            (if newvers (concat oldvers ":" newvers) oldvers)))
+                    (when diff-switches-list
+                      (list "-x" (mapconcat 'identity diff-switches-list " "))))))
+      (if (vc-svn-stay-local-p file)
+          1 ;; async diff, pessimistic assumption
+        status))))
+
+(defun vc-svn-diff-tree (dir &optional rev1 rev2)
+  "Diff all files at and below DIR."
+  (with-current-buffer "*vc-diff*"
+    (setq default-directory dir)
+    (if (vc-svn-stay-local-p dir)
+        ;; local diff: do it filewise, and only for files that are modified
+        (vc-file-tree-walk
+         dir
+         (lambda (f)
+           (vc-exec-after
+            `(let ((coding-system-for-read (vc-coding-system-for-diff ',f)))
+               ;; possible optimization: fetch the state of all files
+               ;; in the tree via vc-svn-dir-state-heuristic
+               (unless (vc-up-to-date-p ',f)
+                 (message "Looking at %s" ',f)
+                 (vc-diff-internal ',f ',rev1 ',rev2))))))
+      ;; svn diff: use a single call for the entire tree
+      (let ((coding-system-for-read (or coding-system-for-read 'undecided))
+            (diff-switches-list (vc-diff-switches-list 'SVN)))
+        (apply 'vc-svn-command "*vc-diff*" 1 nil "diff"
+               (append
+                (when oldvers
+                  (list "-r"
+                        (if rev2 (concat rev1 ":" rev2) rev1)))
+                (when diff-switches-list
+                  (list "-x" (mapconcat 'identity diff-switches-list " ")))))))))
+
+;;;
+;;; Snapshot system
+;;;
+
+(defun vc-svn-create-snapshot (dir name branchp)
+  "Assign to DIR's current version a given NAME.
+If BRANCHP is non-nil, the name is created as a branch (and the current
+workspace is immediately moved to that new branch)."
+  (vc-svn-command nil 0 dir "tag" "-c" (if branchp "-b") name)
+  (when branchp (vc-svn-command nil 0 dir "update" "-r" name)))
+
+(defun vc-svn-retrieve-snapshot (dir name update)
+  "Retrieve a snapshot at and below DIR.
+NAME is the name of the snapshot; if it is empty, do a `svn update'.
+If UPDATE is non-nil, then update (resynch) any affected buffers."
+  (with-current-buffer (get-buffer-create "*vc*")
+    (let ((default-directory dir)
+          (sticky-tag))
+      (erase-buffer)
+      (if (or (not name) (string= name ""))
+          (vc-svn-command t 0 nil "update")
+        (vc-svn-command t 0 nil "update" "-r" name)
+        (setq sticky-tag name))
+      (when update
+        (goto-char (point-min))
+        (while (not (eobp))
+          (if (looking-at "\\([CMUP]\\) \\(.*\\)")
+              (let* ((file (expand-file-name (match-string 2) dir))
+                     (state (match-string 1))
+                     (buffer (find-buffer-visiting file)))
+                (when buffer
+                  (cond
+                   ((or (string= state "U")
+                        (string= state "P"))
+                    (vc-file-setprop file 'vc-state 'up-to-date)
+                    (vc-file-setprop file 'vc-workfile-version nil)
+                    (vc-file-setprop file 'vc-checkout-time
+                                     (nth 5 (file-attributes file))))
+                   ((or (string= state "M")
+                        (string= state "C"))
+                    (vc-file-setprop file 'vc-state 'edited)
+                    (vc-file-setprop file 'vc-workfile-version nil)
+                    (vc-file-setprop file 'vc-checkout-time 0)))
+                  (vc-file-setprop file 'vc-svn-sticky-tag sticky-tag)
+                  (vc-resynch-buffer file t t))))
+          (forward-line 1))))))
+
+
+;;;
+;;; Miscellaneous
+;;;
+
+;; Subversion makes backups for us, so don't bother.
+;; (defalias 'vc-svn-make-version-backups-p 'vc-svn-stay-local-p
+;;   "Return non-nil if version backups should be made for FILE.")
+
+(defun vc-svn-check-headers ()
+  "Check if the current file has any headers in it."
+  (save-excursion
+    (goto-char (point-min))
+    (re-search-forward "\\$[A-Za-z\300-\326\330-\366\370-\377]+\
+\\(: [\t -#%-\176\240-\377]*\\)?\\$" nil t)))
+
+
+;;;
+;;; Internal functions
+;;;
+
+(defun vc-svn-command (buffer okstatus file &rest flags)
+  "A wrapper around `vc-do-command' for use in vc-svn.el.
+The difference to vc-do-command is that this function always invokes `svn',
+and that it passes `vc-svn-global-switches' to it before FLAGS."
+  (apply 'vc-do-command buffer okstatus "svn" file
+         (if (stringp vc-svn-global-switches)
+             (cons vc-svn-global-switches flags)
+           (append vc-svn-global-switches
+                   flags))))
+
+(defun vc-svn-stay-local-p (file)
+  "Return non-nil if VC should stay local when handling FILE.
+See `vc-svn-stay-local'."
+  (when vc-svn-stay-local
+    (let* ((dirname (if (file-directory-p file)
+                        (directory-file-name file)
+                      (file-name-directory file)))
+           (prop
+            (or (vc-file-getprop dirname 'vc-svn-stay-local-p)
+                (vc-file-setprop
+                 dirname 'vc-svn-stay-local-p
+                 (let ((rootname (expand-file-name ".svn/entries" dirname)))
+                   (cond
+                    ((not (file-readable-p rootname)) 'no)
+                    ((stringp vc-svn-stay-local)
+                     (with-temp-buffer
+                       (let ((coding-system-for-read
+                              (or file-name-coding-system
+                                  default-file-name-coding-system)))
+                         (vc-insert-file rootname))
+                       (goto-char (point-min))
+                       (when (re-search-forward
+                              (concat "name=\"svn:this_dir\"[\n\t ]*"
+                                      "url=\"\\([^\"]+\\)\"") nil t)
+                         (let ((hostname (match-string 1)))
+                           (if (not hostname)
+                               'no
+                             (let* ((stay-local t)
+                                    (rx
+                                     (cond
+                                      ;; vc-svn-stay-local: rx
+                                      ((stringp vc-svn-stay-local)
+                                       vc-svn-stay-local)
+                                      ;; vc-svn-stay-local: '( [except] rx ... )
+                                      ((consp vc-svn-stay-local)
+                                       (mapconcat
+                                        'identity
+                                        (if (not (eq (car vc-svn-stay-local)
+                                                     'except))
+                                            vc-svn-stay-local
+                                          (setq stay-local nil)
+                                          (cdr vc-svn-stay-local))
+                                        "\\|")))))
+                               (if (not rx)
+                                   'yes
+                                 (if (not (string-match rx hostname))
+                                     (setq stay-local (not stay-local)))
+                                 (if stay-local
+                                     'yes
+                                   'no))))))))))))))
+      (if (eq prop 'yes) t nil))))
+
+(defun vc-svn-parse-status (localp)
+  "Parse output of \"svn status\" command in the current buffer.
+Set file properties accordingly.  Unless FULL is t, parse only
+essential information."
+  (let (file status)
+    (goto-char (point-min))
+    (while (re-search-forward
+            "^[ ADMCI?!~][ MC][ L][ +][ S]..\\([ *]\\) +\\([0-9]+\\) +\\([0-9?]+\\) +\\([^ ]+\\) +" nil t)
+      (setq file (expand-file-name
+                  (buffer-substring (point) (line-end-position))))
+      (setq status (char-after (line-beginning-position)))
+      (unless (eq status ??)
+        (vc-file-setprop file 'vc-backend 'SVN)
+        (vc-file-setprop file 'vc-workfile-version (match-string 2))
+        (vc-file-setprop
+         file 'vc-state
+         (cond
+          ((eq status ?\ )
+           (if (eq (char-after (match-beginning 1)) ?*)
+               'needs-patch
+             (vc-file-setprop file 'vc-checkout-time
+                              (nth 5 (file-attributes file)))
+             'up-to-date))
+          ((eq status ?A)
+           (vc-file-setprop file 'vc-checkout-time 0)
+           'edited)
+          ((memq status '(?M ?C))
+           (if (eq (char-after (match-beginning 1)) ?*)
+               'needs-merge
+             'edited))
+          (t 'edited)))))))
+
+(defun vc-svn-dir-state-heuristic (dir)
+  "Find the SVN state of all files in DIR, using only local information."
+  (vc-svn-dir-state dir 'local))
+
+(defun vc-svn-valid-symbolic-tag-name-p (tag)
+  "Return non-nil if TAG is a valid symbolic tag name."
+  ;; According to the SVN manual, a valid symbolic tag must start with
+  ;; an uppercase or lowercase letter and can contain uppercase and
+  ;; lowercase letters, digits, `-', and `_'.
+  (and (string-match "^[a-zA-Z]" tag)
+       (not (string-match "[^a-z0-9A-Z-_]" tag))))
+
+(defun vc-svn-valid-version-number-p (tag)
+  "Return non-nil if TAG is a valid version number."
+  (and (string-match "^[0-9]" tag)
+       (not (string-match "[^0-9]" tag))))
+
+(provide 'vc-svn)
+
+;;; vc-svn.el ends here