2 files changed, 12 insertions, 7 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index c4141905890..067f561293b 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2009-01-15  Dan Nicolaescu  <dann@ics.uci.edu>
+
+        * vc-hg.el (vc-hg-diff): Pass relative file names.  (Bug#1903)
+
 2009-01-15  Martin Rudalics  <rudalics@gmx.at>
 
         * window.el (special-display-p): Revert 2009-01-14 change.
diff --git a/lisp/vc-hg.el b/lisp/vc-hg.el
index 05a1ae5473d..d47df2a7b3f 100644
--- a/lisp/vc-hg.el
+++ b/lisp/vc-hg.el
@@ -44,8 +44,8 @@
 ;; - state-heuristic (file)                    NOT NEEDED
 ;; - dir-status (dir update-function)          OK
 ;; - dir-status-files (dir files ds uf)        OK
-;; - dir-extra-headers (dir)                OK
-;; - dir-printer (fileinfo)                 OK
+;; - dir-extra-headers (dir)                   OK
+;; - dir-printer (fileinfo)                    OK
 ;; * working-revision (file)                   OK
 ;; - latest-on-branch-p (file)                 ??
 ;; * checkout-model (files)                    OK
@@ -80,8 +80,8 @@
 ;; - annotate-current-time ()                  NOT NEEDED
 ;; - annotate-extract-revision-at-line ()      OK
 ;; TAG SYSTEM
-;; - create-tag (dir name branchp)       NEEDED
-;; - retrieve-tag (dir name update)       NEEDED
+;; - create-tag (dir name branchp)             NEEDED
+;; - retrieve-tag (dir name update)            NEEDED
 ;; MISCELLANEOUS
 ;; - make-version-backups-p (file)             ??
 ;; - repository-hostname (dirname)             ??
@@ -259,15 +259,16 @@ If nil, use the value of `vc-diff-switches'.  If t, use no switches."
 (defun vc-hg-diff (files &optional oldvers newvers buffer)
   "Get a difference report using hg between two revisions of FILES."
   (let* ((firstfile (car files))
+         (cwd (if firstfile (file-name-directory firstfile)
+                (expand-file-name default-directory)))
          (working (and firstfile (vc-working-revision firstfile))))
     (when (and (equal oldvers working) (not newvers))
       (setq oldvers nil))
     (when (and (not oldvers) newvers)
       (setq oldvers working))
     (apply #'vc-hg-command (or buffer "*vc-diff*") nil
-           (mapcar (lambda (file) (file-name-nondirectory file)) files)
-           "--cwd" (or (when firstfile (file-name-directory firstfile))
-                       (expand-file-name default-directory))
+           (mapcar (lambda (file) (file-relative-name file cwd)) files)
+           "--cwd" cwd
            "diff"
            (append
             (vc-switches 'hg 'diff)