From: ts <decoux@...>
Date: 2002-04-27T01:40:08+09:00
Subject: Re: expand_path and overlap

>>>>> "M" == Morris, Chris <chris.morris@snelling.com> writes:

M>       assert_equal("/a/b", collapse_path_ts("/a/b", "/"))
M>       assert_equal("/m/n", collapse_path_ts("/m/n", "/a/b"))

 Well, 

   def collapse_path_ts(p, m)
      if %r{^([^\0]*/)([^\0]+)(?:/|\z)[^\0]*\0\2(.*)} =~  m + "\0" + p
         $1+ $2 + $3
      else 
         if p[0] == ?/
            p
         else
	    m + "/" + p
         end
      end
   end


p.s.: but verify it :-)


Guy Decoux