GenerateVersionHeader.cmake

# this cmake file is part of the following project, which is licensed under
# an MIT license. Please see version.LICENSE for details.
# https://github.com/nocnokneo/cmake-git-versioning-example


if(GIT_EXECUTABLE)
    get_filename_component(SRC_DIR ${SRC} DIRECTORY)
    # Generate a git-describe version string from Git repository tags
    execute_process(
            COMMAND ${GIT_EXECUTABLE} describe --tags --dirty --match "v*"
            WORKING_DIRECTORY ${SRC_DIR}
            OUTPUT_VARIABLE GIT_DESCRIBE_VERSION
            RESULT_VARIABLE GIT_DESCRIBE_ERROR_CODE
            OUTPUT_STRIP_TRAILING_WHITESPACE
    )
    if(NOT GIT_DESCRIBE_ERROR_CODE)
        set(INJ_VERSION ${GIT_DESCRIBE_VERSION})
    endif()
endif()

# Final fallback: Just use a bogus version string that is semantically older
# than anything else and spit out a warning to the developer.
if(NOT DEFINED INJ_VERSION)
    set(INJ_VERSION v0.0.0-unknown)
    message(WARNING "Failed to determine INJ_VERSION from Git tags. Using default version \"${INJ_VERSION}\".")
endif()

configure_file(${SRC} ${DST} @ONLY)