refactoring

FindParMETIS.cmake
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			set(_paths "${PARMETIS_DIR}"
			ENV PARMETIS_DIR
			ENV PARTMETIS_ROOT
			ENV PARMETIS_HOME
			)

			find_path(PARMETIS_INCLUDE_DIR parmetis.h
			PATHS ${_paths}
			PATH_SUFFIXES include
			)

			find_library(PARMETIS_LIBRARY NAMES parmetis
			PATHS ${_paths}
			PATH_SUFFIXES lib
			)

			mark_as_advanced(PARMETIS_LIBRARY PARMETIS_INCLUDE_DIR)

			#===============================================================================
			include(FindPackageHandleStandardArgs)
			if(CMAKE_VERSION VERSION_GREATER 2.8.12)
			if(PARMETIS_INCLUDE_DIR)
			file(STRINGS ${PARMETIS_INCLUDE_DIR}/parmetis.h _versions
			REGEX "^#define\ +PARMETIS_(MAJOR\|MINOR\|SUBMINOR)_VERSION .*")
			foreach(_ver ${_versions})
			string(REGEX MATCH "PARMETIS_(MAJOR\|MINOR\|SUBMINOR)_VERSION *([0-9.]+)" _tmp "${_ver}")
			set(_parmetis_${CMAKE_MATCH_1} ${CMAKE_MATCH_2})
			endforeach()
			set(PARMETIS_VERSION "${_parmetis_MAJOR}.${_parmetis_MINOR}" CACHE INTERNAL "")
			endif()

			find_package_handle_standard_args(ParMETIS
			REQUIRED_VARS
			PARMETIS_LIBRARY
			PARMETIS_INCLUDE_DIR
			VERSION_VAR
			PARMETIS_VERSION)
			else()
			find_package_handle_standard_args(ParMETIS DEFAULT_MSG
			PARMETIS_LIBRARY PARMETIS_INCLUDE_DIR)
			endif()