bug#8159: file-name-sans-version fails for some git files

[Eli Zaretskii]

> Date: Sat, 5 Mar 2011 16:42:40 +0000
> From: Reuben Thomas <rrt@sc3d.org>
> Cc: schwab@linux-m68k.org, 8159@debbugs.gnu.org
> 
> >> \\(?:~\\|\\.~[-[:alnum:]:#@^._]+\\(~[[:digit:]]+\\)?~\\)
> >>
> >> would cope with just the git version scheme, while not swallowing
> >> multiple backup suffixes.
> >
> > I would suggest a comment mentioning the git case with an example.
> 
> So, something like:
> 
> (defvar file-name-version-regexp
>   "\\(?:~\\|\\.~[-[:alnum:]:#@^._]+\\(~[[:digit:]]+\\)?~\\)"
>   ;; The optional ~[[:digit]]+ matches relative versions in git like `HEAD~2'
>   "Regular expression matching the backup/version part of a file name.
> Used by `file-name-sans-versions'.")
> 
> ?

Yes, that's fine.  Thanks.