bug#13547: svn annotate - incorrect previous/next revision

[Lars Ljung]

Hi,

The functions vc-svn-previous-revision and vc-svn-next-revision just add
or subtract 1 from the revision number. The is usually not correct.

This patch uses "svn log" to get the correct previous/next revision of
the file.

Kind regards,
Lars Ljung

=== modified file 'lisp/vc/vc-svn.el'
*** lisp/vc/vc-svn.el   2013-01-02 16:13:04 +0000
--- lisp/vc/vc-svn.el   2013-01-25 08:26:53 +0000
*************** RESULT is a list of conses (FILE . STATE
*** 259,279 ****
  ;; works just fine.

  (defun vc-svn-previous-revision (file rev)
!   (let ((newrev (1- (string-to-number rev))))
!     (when (< 0 newrev)
!       (number-to-string newrev))))

  (defun vc-svn-next-revision (file rev)
!   (let ((newrev (1+ (string-to-number rev))))
!     ;; The "working revision" is an uneasy conceptual fit under
Subversion;
!     ;; we use it as the upper bound until a better idea comes along.
If the
!     ;; workfile version W coincides with the tree's latest revision R,
then
!     ;; this check prevents a "no such revision: R+1" error.  Otherwise, it
!     ;; inhibits showing of W+1 through R, which could be considered
anywhere
!     ;; from gracious to impolite.
!     (unless (< (string-to-number (vc-file-getprop file
'vc-working-revision))
!                newrev)
!       (number-to-string newrev))))


  ;;;
--- 259,280 ----
  ;; works just fine.

  (defun vc-svn-previous-revision (file rev)
!   (with-temp-buffer
!     (vc-svn-command t 0 file "log" "-q" "--limit" "2"
!                   (format "-r%s:1" rev))
!     (let ((revision-list '()))
!       (while (re-search-backward "^r\\([0-9]+\\)" nil t)
!       (setq revision-list (cons (match-string 1) revision-list)))
!       (cadr revision-list))))

  (defun vc-svn-next-revision (file rev)
!   (with-temp-buffer
!     (vc-svn-command t 0 file "log" "-q" "--limit" "2"
!                   (format "-r%s:HEAD" rev))
!     (let ((revision-list '()))
!       (while (re-search-backward "^r\\([0-9]+\\)" nil t)
!       (setq revision-list (cons (match-string 1) revision-list)))
!       (cadr revision-list))))


  ;;;