#[[
© 2024 AO Kaspersky Lab

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]

include_guard(GLOBAL)


find_package(Git QUIET)


if(NOT Git_FOUND)
    find_package(Git REQUIRED)
    message("Git found: ${GIT_EXECUTABLE}.")
endif()


function(add_git_submodule dir)
    # Add a Git submodule directory to CMake, assuming the
    # Git submodule directory is a CMake project.

    set(project_list "${dir}/CMakeLists.txt")

    if(NOT EXISTS "${project_list}")
        message(STATUS "Adding submodule \"${dir}\"...")
        if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
            execute_process(COMMAND "${GIT_EXECUTABLE}" submodule update --init --recursive --depth 1 -- "${dir}"
                            WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
                            COMMAND_ERROR_IS_FATAL ANY)
        endif()
    endif()

    if(EXISTS "${project_list}")
        # get_filename_component(build_dir "${dir}" NAME)
        set(CMAKE_VERIFY_INTERFACE_HEADER_SETS OFF)
        add_subdirectory("${dir}" EXCLUDE_FROM_ALL)
    endif()

endfunction()