Had this working well in Emacs 23.1.x but it appears to have broke in the move to Emacs 23.2
I want to use ediff when comparing working copy of a file with SVN HEAD.
Normally I press C-x v = and ediff runs because of the following configuration in my .emacs
;; Use ediff and not diff
(setq diff-command "ediff")
But, alas I still get the normal vc-diff buffer appearing and no ediff session...
Has anyone else encountered this and know what might be the problem?
Am a bit skeptical that the above setting did what you say it did.
That said, this will bind '=' to use 'ediff-revision:
(eval-after-load "vc-hooks"
'(define-key vc-prefix-map "=" 'ediff-revision))
Found out I could just rebind C-x v = to the following:
(defun ediff-current-buffer-revision ()
"Run Ediff to diff current buffer's file against VC depot.
Uses `vc.el' or `rcs.el' depending on `ediff-version-control-package'."
(interactive)
(let ((file (or (buffer-file-name)
(error "Current buffer is not visiting a file"))))
(if (and (buffer-modified-p)
(y-or-n-p (message "Buffer %s is modified. Save buffer? "
(buffer-name))))
(save-buffer (current-buffer)))
(ediff-load-version-control)
(funcall
(intern (format "ediff-%S-internal" ediff-version-control-package))
"" "" nil)))
This approach means you avoid having to specify the versions to compare as it defaults to comparing HEAD and the current file state.