macro(source_group_by_dir source_files)
  if(MSVC)
    set(sgbd_cur_dir ${CMAKE_CURRENT_SOURCE_DIR})
    foreach(sgbd_file ${${source_files}})
      string(REGEX REPLACE ${sgbd_cur_dir}/\(.*\) \\1 sgbd_fpath ${sgbd_file})
      string(REGEX REPLACE "\(.*\)/.*" \\1 sgbd_group_name ${sgbd_fpath})
      string(COMPARE EQUAL ${sgbd_fpath} ${sgbd_group_name} sgbd_nogroup)
      string(REPLACE "/" "\\" sgbd_group_name ${sgbd_group_name})
      if(sgbd_nogroup)
        set(sgbd_group_name "\\")
      endif(sgbd_nogroup)
      source_group(${sgbd_group_name} FILES ${sgbd_file})
    endforeach(sgbd_file)
  endif(MSVC)
endmacro(source_group_by_dir)