GNU bug report logs - #4642
diff from log-view somtime diffs the wrong file

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Dan Nicolaescu <dann <at> ics.uci.edu>
Subject: bug#4642: marked as done (diff from log-view somtime diffs the
 wrong file)
Date: Mon, 05 Oct 2009 15:20:05 +0000

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Your message dated Mon, 5 Oct 2009 08:14:20 -0700 (PDT)
with message-id <200910051514.n95FEK5r011964 <at> godzilla.ics.uci.edu>
and subject line Re: bug#4642: diff from log-view somtime diffs the wrong file
has caused the Emacs bug report #4642,
regarding diff from log-view somtime diffs the wrong file
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

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4642: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4642
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[Message part 2 (message/rfc822, inline)]

From: Dan Nicolaescu <dann <at> ics.uci.edu>
To: bug-gnu-emacs <bug-gnu-emacs <at> gnu.org>
Subject: diff from log-view somtime diffs the wrong file
Date: Mon, 5 Oct 2009 05:43:57 -0700 (PDT)

emacs -Q

C-x v d SOME_DIRECTORY RET

say the above display 2 files a and b

put the cursor on a and do:

C-x v l

put the cursor on b and

switch to the *vc-change-log* buffer.

press d in that buffer

it will show a diff for the file "b", not "a" (or it will give an error
that the diff is not found).

log-view-diff calls vc-version-diff, which calls vc-diff-internal not
using it's arguments, but by calling `vc-deduce-fileset'.  That will
trigger this code in vc-deduce-fileset:

     ((and (buffer-live-p vc-parent-buffer)
           (or (buffer-file-name vc-parent-buffer)
             (with-current-buffer
                  vc-parent-buffer
                          (derived-mode-p 'vc-dir-mode))))


but the selected file in the vc-dir buffer has changed, and this will
return the new selected file, while log-view actually wants the old one.

One way to fix this is to make log-view-diff not call vc-version-diff,
but vc-diff-internal, like so:

--- log-view.el.~1.60.~    2009-10-03 03:20:50.000000000 -0700
+++ log-view.el            2009-10-04 19:20:58.000000000 -0700
@@ -496,11 +496,12 @@ changeset that affected the currently co
         (goto-char end)
         (log-view-msg-next)
         (setq to (log-view-current-tag))))
-    (vc-version-diff
-     (if log-view-per-file-logs
-      (list (log-view-current-file))
-       log-view-vc-fileset)
-       to fr)))
+    (vc-diff-internal
+     t (list log-view-vc-backend
+          (if log-view-per-file-logs
+               (list (log-view-current-file))
+                      log-view-vc-fileset))
+     to fr)))
 
 (declare-function vc-diff-internal "vc"
                    (async vc-fileset rev1 rev2 &optional verbose))

OK to check in?

[Message part 3 (message/rfc822, inline)]

From: Dan Nicolaescu <dann <at> ics.uci.edu>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 4642-done <at> debbugs.gnu.org
Subject: Re: bug#4642: diff from log-view somtime diffs the wrong file
Date: Mon, 5 Oct 2009 08:14:20 -0700 (PDT)

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

  > > One way to fix this is to make log-view-diff not call vc-version-diff,
  > > but vc-diff-internal, like so:
  > 
  > That looks OK.  

Thanks, checked in.

  > But we should also either fix vc-version-diff so it doesn't ignore
  > its `files' argument, or otherwise remove that argument

Can you please do that, it's unclear to me how to fix this.

  > (which will be a good opportunity to go and fix the other callers).

Luckily there's only 2 callers: vc-diff and vc-root-diff (which is
clearly marked as not working correctly with vc-version-diff...).

  > 
  >         Stefan
  > 
  > 
  > > --- log-view.el.~1.60.~    2009-10-03 03:20:50.000000000 -0700
  > > +++ log-view.el            2009-10-04 19:20:58.000000000 -0700
  > > @@ -496,11 +496,12 @@ changeset that affected the currently co
  > >          (goto-char end)
  > >          (log-view-msg-next)
  > >          (setq to (log-view-current-tag))))
  > > -    (vc-version-diff
  > > -     (if log-view-per-file-logs
  > > -      (list (log-view-current-file))
  > > -       log-view-vc-fileset)
  > > -       to fr)))
  > > +    (vc-diff-internal
  > > +     t (list log-view-vc-backend
  > > +          (if log-view-per-file-logs
  > > +               (list (log-view-current-file))
  > > +                      log-view-vc-fileset))
  > > +     to fr)))
  >  
  > >  (declare-function vc-diff-internal "vc"
  > >                     (async vc-fileset rev1 rev2 &optional verbose))
  > 
  > > OK to check in?

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