Bug#334868: netrw.vim does not handle properly %xx escaping and relative URLs in the "file:" URL scheme

[Stefano Zacchiroli]

Body of the previous bug report (which was missing due to a bug in
reportbug :-)

--- CUT HERE ---

Plugin netrw.vim has two issues in the handling of file:// URLs:

1) %xx escaping is not handled properly. For example, opening
   file:///a%20b.txt will result in vim opening something weird since
   the '%' sign will be expanded to the name of the file being opened(!)

   This is an issue expecially with gvim and gnome since the "open with"
   feature of nautilus escapes spaces and other special characters with
   the '%xx' notation

2) relative URLs are not properly handled. The convention is that 2
   slashes URLs in the file scheme are relative, while those with 3
   slashes are absolute. Thus, for example:

      file://a      -> a in the cwd
      file:///a     -> /a

The attached patch solves both issues implementing:
- URI %xx unescaping
- escaping of special characters for the "e:" command
- removal of "file://" prefix on autocommands

Cheers.

--- CUT HERE ---

-- 
Stefano Zacchiroli -*- Computer Science PhD student @ Uny Bologna, Italy
zack@{cs.unibo.it,debian.org,bononia.it} -%- http://www.bononia.it/zack/
If there's any real truth it's that the entire multidimensional infinity
of the Universe is almost certainly being run by a bunch of maniacs. -!-
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