#
# Copyright (C) 2018 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
#

set(_template_file "${CMAKE_CURRENT_LIST_DIR}/LiriGitRevision.h.in")

function(liri_create_git_head_revision_file _file)
    if(NOT GIT_FOUND)
        find_package(Git QUIET)
    endif()

    set(_git_rev "")

    if(GIT_FOUND)
        execute_process(
            COMMAND "${GIT_EXECUTABLE}" rev-parse HEAD
            WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
            OUTPUT_VARIABLE _git_rev
        )
        string(STRIP "${_git_rev}" _git_rev)
    endif()

    if("x${_git_rev}" STREQUAL "x")
        set(_git_rev "tarball")
    endif()

    configure_file("${_template_file}" "${CMAKE_CURRENT_BINARY_DIR}/${_file}" @ONLY)
endfunction()
