############################################################################
#
# Copyright (c) 2017 PX4 Development Team. All rights reserved.
#
# 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 above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. 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.
# 3. Neither the name PX4 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 OWNER 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.
#
############################################################################

# cmake include guard
if(px4_git_included)
	return()
endif(px4_git_included)
set(px4_git_included true)

#=============================================================================
#
#	px4_add_git_submodule
#
#	This function add a git submodule target.
#
#	Usage:
#		px4_add_git_submodule(TARGET <target> PATH <path>)
#
#	Input:
#		PATH		: git submodule path
#
#	Output:
#		TARGET		: git target
#
#	Example:
#		px4_add_git_submodule(TARGET git_nuttx PATH "NuttX")
#
function(px4_add_git_submodule)
	px4_parse_function_args(
		NAME px4_add_git_submodule
		ONE_VALUE TARGET PATH
		REQUIRED TARGET PATH
		ARGN ${ARGN})

	set(REL_PATH)

	if(IS_ABSOLUTE ${PATH})
		file(RELATIVE_PATH REL_PATH ${PX4_SOURCE_DIR} ${PATH})
	else()
		file(RELATIVE_PATH REL_PATH ${PX4_SOURCE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/${PATH})
	endif()

	execute_process(
		COMMAND Tools/check_submodules.sh ${REL_PATH}
		WORKING_DIRECTORY ${PX4_SOURCE_DIR}
		)

	string(REPLACE "/" "_" NAME ${PATH})
	string(REPLACE "." "_" NAME ${NAME})

	add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/git_init_${NAME}.stamp
		COMMAND Tools/check_submodules.sh ${REL_PATH}
		COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/git_init_${NAME}.stamp
		DEPENDS ${PX4_SOURCE_DIR}/.gitmodules ${PATH}/.git
		COMMENT "git submodule ${REL_PATH}"
		WORKING_DIRECTORY ${PX4_SOURCE_DIR}
		USES_TERMINAL
		)

	add_custom_target(${TARGET} DEPENDS git_init_${NAME}.stamp)
endfunction()