filesystem.h

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/*
 * #%L
 * OME-COMMON C++ library for C++ compatibility/portability
 * %%
 * Copyright © 2006 - 2016 Open Microscopy Environment:
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 *   - National Institutes of Health
 *   - University of Dundee
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 *   - Glencoe Software, Inc.
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#ifndef OME_COMMON_FILESYSTEM_H
# define OME_COMMON_FILESYSTEM_H

# include <ome/common/config.h>

#include <boost/filesystem/operations.hpp>
#include <boost/filesystem/path.hpp>

// Older versions use get_generic_category() in place of the new
// generic_category()
# ifdef OME_HAVE_BOOST_FILESYSTEM_CANONICAL
#  ifdef BOOST_SYSTEM_NO_DEPRECATED
#   undef BOOST_SYSTEM_NO_DEPRECATED
#  endif // BOOST_SYSTEM_NO_DEPRECATED
#  include <boost/system/error_code.hpp>
# endif // OME_HAVE_BOOST_FILESYSTEM_CANONICAL

namespace ome
{

  namespace common
  {

# ifdef OME_HAVE_BOOST_FILESYSTEM_ABSOLUTE
    using boost::filesystem::absolute;
# else // OME_HAVE_BOOST_FILESYSTEM_ABSOLUTE not defined

    inline
    boost::filesystem::path
    absolute(const boost::filesystem::path& p,
             const boost::filesystem::path& base = boost::filesystem::current_path())
    {
      return boost::filesystem::complete(p, base);
    }
# endif // OME_HAVE_BOOST_FILESYSTEM_ABSOLUTE

# ifdef OME_HAVE_BOOST_FILESYSTEM_CANONICAL
    using boost::filesystem::canonical;
# else // OME_HAVE_BOOST_FILESYSTEM_CANONICAL not defined
    // Implementation derived from boost 1.55.
    inline
    boost::filesystem::path
    canonical(const boost::filesystem::path& p,
              const boost::filesystem::path& base = boost::filesystem::current_path(),
              boost::system::error_code* ec = 0)
    {
      boost::filesystem::path source (absolute(p, base));
      boost::filesystem::path result;

      boost::system::error_code local_ec;
      boost::filesystem::file_status stat (status(source, local_ec));

      if (stat.type() == boost::filesystem::file_not_found)
        {
          if (ec == 0)
            throw boost::filesystem::filesystem_error
              ("boost::filesystem::canonical", source,
               boost::system::error_code(boost::system::errc::no_such_file_or_directory,
                                         boost::system::get_generic_category()));
          ec->assign(boost::system::errc::no_such_file_or_directory,
                     boost::system::get_generic_category());
          return result;
        }
      else if (local_ec)
        {
          if (ec == 0)
            throw(boost::filesystem::filesystem_error
                  ("boost::filesystem::canonical", source, local_ec));
          *ec = local_ec;
          return result;
        }
    }
# endif // OME_HAVE_BOOST_FILESYSTEM_CANONICAL

    inline
    boost::filesystem::path
    make_relative(boost::filesystem::path from,
                  boost::filesystem::path to)
    {
      from = absolute(from);
      to = absolute(to);
      boost::filesystem::path ret;
      boost::filesystem::path::const_iterator itrFrom(from.begin());
      boost::filesystem::path::const_iterator itrTo(to.begin());

      // Find common base
      for(boost::filesystem::path::const_iterator toEnd(to.end()), fromEnd(from.end());
          itrFrom != fromEnd && itrTo != toEnd && *itrFrom == *itrTo;
          ++itrFrom, ++itrTo);

      // Navigate backwards in directory to reach previously found base
      for(boost::filesystem::path::const_iterator fromEnd(from.end());
          itrFrom != fromEnd;
          ++itrFrom )
        {
          if((*itrFrom) != ".")
            ret /= "..";
        }
      // Now navigate down the directory branch
      for (boost::filesystem::path::iterator begin = itrTo;
           begin != to.end();
           ++begin)
        ret /= *begin;

      return ret;
    }

  }
}

#endif // OME_COMMON_FILESYSTEM_H

/*
 * Local Variables:
 * mode:C++
 * End:
 */