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>

namespace ome
{

  namespace common
  {

    using boost::filesystem::absolute;
    using 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

/*
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 * mode:C++
 * End:
 */