# Copyright (c) 2022, ETH Zurich and UNC Chapel Hill.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#
#     * Neither the name of ETH Zurich and UNC Chapel Hill nor the names of
#       its contributors may be used to endorse or promote products derived
#       from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# Author: Johannes L. Schoenberger (jsch-at-demuc-dot-de)

if (DEFINED GIT_COMMIT_ID OR DEFINED GIT_COMMIT_DATE)
    message(STATUS "Using custom-defined GIT_COMMIT_ID (${GIT_COMMIT_ID}) "
            "and GIT_COMMIT_DATE (${GIT_COMMIT_DATE})")
elseif(Git_FOUND AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.git")
    execute_process(COMMAND
        "${GIT_EXECUTABLE}" rev-parse --short HEAD
        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
        OUTPUT_VARIABLE GIT_COMMIT_ID
        ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)

    execute_process(COMMAND
        "${GIT_EXECUTABLE}" log -1 --format=%ad --date=short
        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
        OUTPUT_VARIABLE GIT_COMMIT_DATE
        ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
else()
    set(GIT_COMMIT_ID "Unknown")
    set(GIT_COMMIT_DATE "Unknown")
endif()

configure_file("${CMAKE_CURRENT_SOURCE_DIR}/src/util/version.h.in"
               "${CMAKE_CURRENT_SOURCE_DIR}/src/util/version.h")