[Boost-bugs] [Boost C++ Libraries] #5897: Make path relative function.

Subject: [Boost-bugs] [Boost C++ Libraries] #5897: Make path relative function.
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-09-13 22:51:59

#5897: Make path relative function.
---------------------------------+------------------------------------------
 Reporter:  jmckesson@…          |       Owner:  bemandawes
     Type:  Feature Requests     |      Status:  new       
Milestone:  To Be Determined     |   Component:  filesystem
  Version:  Boost 1.47.0         |    Severity:  Problem   
 Keywords:                       |  
---------------------------------+------------------------------------------
 It is often useful to take a path that is absolute and make it relative to
 some other path. For example, if you're copying from directory A to
 directory B using a recursive_directory_iterator, it is often the case
 that you will do the following:

 {{{
 for_each(bfs::recursive_directory_iterator(directoryA),
 bfs::recursive_directory_iterator(), [=](const bfs::directory_entry
 &entry)
 {
   if(bfs::is_file(entry.status()))
   {
     bfs::path dstPath = directoryB / make_relative(directoryA,
 entry.path());
     bfs::copy_file(entry.path(), dstPath);
   }
 });
 }}}

 The `make_relative` function would iterate through the path components of
 the two arguments, removing entries until it found different ones. Then,
 it would add ".." to the beginning of the second path argument, until it
 ran out of directories in the first path. What you are left with is the
 second path relative to the first one.

 Obviously, this would not work if both paths are absolute. But this is
 such a common operation that there has to be some way to make it work.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5897>
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