refactoring

FindMETIS.cmake
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			set(_paths "${METIS_DIR}"
			ENV METIS_DIR
			ENV METIS_ROOT
			ENV METIS_HOME
			)

			find_path(METIS_INCLUDE_DIR metis.h
			PATHS ${_paths}
			PATH_SUFFIXES include
			)

			find_library(METIS_LIBRARY NAMES metis
			PATHS ${_paths}
			PATH_SUFFIXES lib
			)

			mark_as_advanced(METIS_LIBRARY METIS_INCLUDE_DIR)

			#===============================================================================
			include(FindPackageHandleStandardArgs)
			if(CMAKE_VERSION VERSION_GREATER 2.8.12)
			if(METIS_INCLUDE_DIR)
			file(STRINGS ${METIS_INCLUDE_DIR}/metis.h _versions
			REGEX "^#define\ +METIS_VER_(MAJOR\|MINOR\|SUBMINOR) .*")
			foreach(_ver ${_versions})
			string(REGEX MATCH "METIS_VER_(MAJOR\|MINOR\|SUBMINOR) *([0-9.]+)" _tmp "${_ver}")
			set(_metis_${CMAKE_MATCH_1} ${CMAKE_MATCH_2})
			endforeach()
			set(METIS_VERSION "${_metis_MAJOR}.${_metis_MINOR}" CACHE INTERNAL "")
			endif()

			find_package_handle_standard_args(METIS
			REQUIRED_VARS
			METIS_LIBRARY
			METIS_INCLUDE_DIR
			VERSION_VAR
			METIS_VERSION)
			else()
			find_package_handle_standard_args(METIS DEFAULT_MSG
			METIS_LIBRARY METIS_INCLUDE_DIR)
			endif()