getgitversion.cmake

FIND_PACKAGE(Git)

IF(GIT_FOUND)
	EXECUTE_PROCESS(COMMAND ${GIT_EXECUTABLE} describe --match version-* WORKING_DIRECTORY ${CMAKE_SOURCE_DIR} RESULT_VARIABLE res_var OUTPUT_VARIABLE GIT_COM_ID OUTPUT_STRIP_TRAILING_WHITESPACE)
    	if( ${res_var} EQUAL 0 )
		string(REGEX MATCHALL "[^-]+|-|[^-]+$" ID_PARTS ${GIT_COM_ID})
		LIST(GET ID_PARTS 2 VERSION_ID )
		string(REGEX MATCHALL "[^.]+|.|[^.]+$" VERSION_PARTS ${VERSION_ID})
		LIST(GET VERSION_PARTS 0 VERSION_MAJOR)
		LIST(GET VERSION_PARTS 2 VERSION_MINOR)
		LIST(LENGTH VERSION_PARTS PART_COUNT )
		IF( ${PART_COUNT} LESS  5 )
			SET( VERSION_BUILD 0 )
		ELSE()
			LIST( GET VERSION_PARTS 4 VERSION_BUILD )
		ENDIF()
		STRING(REGEX REPLACE "\r|\n|\r\n" "" VERSION_MINOR ${VERSION_MINOR})
		LIST(LENGTH ID_PARTS PART_COUNT )
		IF( ${PART_COUNT} GREATER_EQUAL  5 )
			LIST( GET ID_PARTS 4 VERSION_PATCH )
			string(APPEND VERSION_BUILD "-${VERSION_PATCH}")
		ENDIF()
		message( STATUS "VERSION: Major: ${VERSION_MAJOR} Minor: ${VERSION_MINOR} Patch: ${VERSION_BUILD}")
		set( GIT_COMMIT_ID "GT")
		set( vstring "# Autogenerated file, do not change!\n" 
			"SET( VERSION_MAJOR \"${VERSION_MAJOR}\")\n"
			"SET( VERSION_MINOR \"${VERSION_MINOR}\")\n"
			"SET( VERSION_BUILD \"${VERSION_BUILD}\")\n")
 
		file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/version.cmake.txt ${vstring} )
		# copy the file to the final header only if the version changes
		# reduces needless rebuilds
		execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
                	       ${CMAKE_CURRENT_BINARY_DIR}/version.cmake.txt ${CMAKE_CURRENT_BINARY_DIR}/version.cmake)
        else()
        	message( WARNING "Git failed (not a repo, or no tags). Build will not contain git revision info." )
    	endif()
else()
    	message( WARNING "Git not found. Build will not contain git revision info." )
endif()