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bug#3224: 23.0.92; vc-dir vs uniquify: wrong directory used

From: Juanma Barranquero
Subject: bug#3224: 23.0.92; vc-dir vs uniquify: wrong directory used
Date: Wed, 6 Jan 2010 05:00:38 +0100

On Tue, Aug 4, 2009 at 13:30, Dan Nicolaescu <address@hidden> wrote:

> I am not familiar with uniquify, but after binding default-directory in
> vc-dir-prepare-status-buffer, I get the result above.
> And it is identical to what happens when doing:
> (progn
>  (require 'uniquify)
>  (setq uniquify-buffer-name-style 'post-forward)
>  (cd "/tmp")
>  (make-directory "foo")
>  (make-directory "bar")
>  (cd "/tmp/foo")
>  (create-file-buffer "*vc-dir*")
>  (cd "/tmp/bar")
>  (create-file-buffer "*vc-dir*"))

In fact, I think the two problems are not exactly the same, though
they are related. If my analysis, and the following patch, are
correct, Dan's example is caused by a bug in
`uniquify-rationalize-file-buffer-names', which sometimes, while
trying to refresh the dirname of a candidate, fails to check that it
is setting it to nil. Fixing that problem makes Dan's example to work,
but Magnus' vc-dir example still fails.

The reason of the other bug is twofold:

On one hand, vc-dir (specifically `vc-dir-prepare-status-buffer') is
calling `create-file-buffer' passing "*vc-dir*" to it; but that
function expects to be passed a filename; in this case, the difference
is relevant because uniquify tries to use that filename's directory
information to decide the dirname for the candidates.

On the other hand, `uniquify-buffer-file-name' should return a
directory, but fails to deal with the case that the "filename" is
already a directory (which can happen, for example, when it is getting
this "filename" from `list-buffers-directory'). In this case it should
just remove any trailing slash and pass it back unscathed.

Please, try the attached patch to see whether it helps.



2010-01-06  Juanma Barranquero  <address@hidden>

        * uniquify.el (uniquify-rationalize-file-buffer-names):
        Don't set uniquify-item-dirname to nil.
        (uniquify-buffer-file-name): If the "filename" is already a directory
        name, do not modify it.

        * vc-dir.el (vc-dir-prepare-status-buffer): Pass a (fake) filename
        to `create-file-buffer' as it expects, not just a buffer name.

=== modified file 'lisp/uniquify.el'
--- lisp/uniquify.el    2010-01-04 05:35:18 +0000
+++ lisp/uniquify.el    2010-01-06 03:22:51 +0000
@@ -232,9 +232,9 @@
            ;; of code like in set-visited-file-name:
            ;; (or (string= new-name (buffer-name)) (rename-buffer new-name t))
            ;; So we need to refresh the dirname of the uniquify-item.
-           (setf (uniquify-item-dirname (car items))
-                 (uniquify-buffer-file-name
-                  (uniquify-item-buffer (car items))))
+           (let ((bfn (uniquify-buffer-file-name (uniquify-item-buffer (car
+             (when bfn
+               (setf (uniquify-item-dirname (car items)) bfn)))
            ;; This shouldn't happen, but maybe there's no dirname any more.
            (unless (uniquify-item-dirname (car items))
              (with-current-buffer (uniquify-item-buffer (car items))
@@ -265,9 +265,11 @@
       (when filename
-        (file-name-directory
-         (expand-file-name
-          (directory-file-name filename))))))))
+        (if (file-directory-p filename)
+            (file-name-as-directory filename)
+          (file-name-directory
+           (expand-file-name
+            (directory-file-name filename)))))))))

 (defun uniquify-rerationalize-w/o-cb (fix-list)
   "Re-rationalize the buffers in FIX-LIST, but ignoring `current-buffer'."

=== modified file 'lisp/vc-dir.el'
--- lisp/vc-dir.el      2009-12-05 00:24:03 +0000
+++ lisp/vc-dir.el      2010-01-06 03:26:33 +0000
@@ -101,7 +101,7 @@
                       (return buffer))))))))
     (or buf
         ;; Create a new buffer named BNAME.
-        (with-current-buffer (create-file-buffer bname)
+        (with-current-buffer (create-file-buffer (expand-file-name bname dir))
           (cd dir)
           (vc-setup-buffer (current-buffer))
           ;; Reset the vc-parent-buffer-name so that it does not appear

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