Re: Synchronizing or merging undo across platforms

Christian Brabandt wrote:

> On Wed, November 16, 2011 9:38 pm, Paul wrote:
> > On Nov 16, 1:42 am, "Christian Brabandt" <cbli...@256bit.org> wrote:
> >
> >> Well, first check that
> >> :echo undofile(@%) points to the same undofile across each platform.
> >
> > Aha, thanks. That helped me determine that my Vim silently ignores me
> > when I try to set relative directories for undodir.
> >
> > :set undodir=. works fine, but no undo file is created when I :set
> > undodir=./undodir
> >
> > This seems to be a different behavior than that of backupdir, even
> > though :help undodir says "See |'backupdir'| for details of the
> > format." Is this expected/documented/fixable?
>
> Hm, setting 'undodir' to a relative directory works for me. I can't
> reproduce this. However there is a bug when using rundo with those
> files.
>
> When using a separate 'undodir' directory to store the undofiles, Vim
> uses the complete path of the file as filename, replacing the path
> separators ('/') by '%'. So far this works as documented by :h
> 'undodir'.
>
> Now when using :rundo with a filename, that contains the complete path
> and using '%' as directory separators, those '%' will be replaced by
> the current file name (as documented by :h filename-modifiers) and
> surprise surprise Vim won't be able to read the undofile.
>
> So this is just plain wrong in this case. So here is a patch, that
> fixes that. This applies only to :rundo and I am not sure, whether
> this should also apply to :wundo (I tend not to apply it there) but
> this should be kept in mind.
>
> Bram, please check and apply.

In most places where you can use a file name % is expanded. And it's
also useful, especially in the form "%:h" to get the directory.

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/// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net \\\
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