Add file-local-name

* doc/lispref/files.texi (Magic File Names): Add `file-local-name'.
(Unique File Names): Use it.

* etc/NEWS: Mention `file-local-name'.

* lisp/files.el (file-local-name): New defun.
(file-expand-wildcards):
* lisp/eshell/em-tramp.el (eshell/su, eshell/sudo):
* lisp/eshell/esh-ext.el (eshell-remote-command):
* lisp/eshell/esh-proc.el (eshell-gather-process-output):
* lisp/org/ob-core.el (org-babel-local-file-name):
* lisp/progmodes/gud.el (gud-common-init, gud-format-command):
* lisp/progmodes/python.el (python-shell-send-file):
* lisp/shell.el (shell):
* lisp/vc/ediff-diff.el (ediff-same-file-contents):
* lisp/vc/vc-git.el (vc-git-checkin): Use it.

1 files changed, 2 insertions, 4 deletions

diff --git a/lisp/vc/ediff-diff.el b/lisp/vc/ediff-diff.el
index b1ac32d7019..56bfebb579c 100644
--- a/lisp/vc/ediff-diff.el
+++ b/lisp/vc/ediff-diff.el
@@ -1347,10 +1347,8 @@ arguments to `skip-chars-forward'."
                  ;; located on the same remote host.
                  (apply 'process-file ediff-cmp-program nil nil nil
                         (append ediff-cmp-options
-                                (list (or (file-remote-p f1 'localname)
-                                          (expand-file-name f1))
-                                      (or (file-remote-p f2 'localname)
-                                          (expand-file-name f2)))))
+                                (list (expand-file-name (file-local-name f1))
+                                      (expand-file-name (file-local-name f2)))))
                  ))
             (and (numberp res) (eq res 0)))