find_package(Git REQUIRED)

macro(get_git_commit_hash output)
  # full commit hash
  execute_process(
    COMMAND ${GIT_EXECUTABLE} log -1 --format="%H"
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
    OUTPUT_VARIABLE ${output}
    OUTPUT_STRIP_TRAILING_WHITESPACE)
endmacro()

macro(get_git_commit_date output)
  # 2024-06-02T20:17:41+00:00
  execute_process(
    COMMAND ${GIT_EXECUTABLE} log -1 --format="%cI"
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
    OUTPUT_VARIABLE ${output}
    OUTPUT_STRIP_TRAILING_WHITESPACE)
endmacro()

macro(get_git_commit_subject output)
  # message from `git commit -m "message"`
  execute_process(
    COMMAND ${GIT_EXECUTABLE} log -1 --format="%s"
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
    OUTPUT_VARIABLE GIT_COMMIT_SUBJECT
    OUTPUT_STRIP_TRAILING_WHITESPACE)
endmacro()