find_package(Git)

if (GIT_FOUND)
  execute_process(
    COMMAND ${GIT_EXECUTABLE} describe --tags --always
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
    OUTPUT_VARIABLE ENGINE_VERSION
    RESULT_VARIABLE GIT_DESCRIBE_ERROR_CODE
    OUTPUT_STRIP_TRAILING_WHITESPACE
    ERROR_QUIET
  )

  execute_process(
    COMMAND ${GIT_EXECUTABLE} log -1 --format=%h
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
    OUTPUT_VARIABLE ENGINE_HASH
    RESULT_VARIABLE GIT_HASH_ERROR_CODE
    OUTPUT_STRIP_TRAILING_WHITESPACE
    ERROR_QUIET
  )
endif()
# Fallback

if (NOT ENGINE_VERSION OR GIT_DESCRIBE_ERROR_CODE)
    set(ENGINE_VERSION "0.0.0")
    message(WARNING "No Git tag found, using default version ${ENGINE_VERSION}, fix this....")
endif()

if (NOT ENGINE_HASH OR GIT_HASH_ERROR_CODE)
    set(ENGINE_HASH "0000000")
    message(WARNING "No Git hash found, using default hash ${ENGINE_HASH}")
endif()

string(REGEX REPLACE "^v" "" ENGINE_VERSION "${ENGINE_VERSION}")