############################################################################
#
# Copyright (c) 2019 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
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# 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.
#
############################################################################

#
#	px4_find_python_module
#
#	Find a required python module
#
#   Usage
#		px4_find_python_module(module_name [REQUIRED])
#
function(px4_find_python_module module)
	string(TOUPPER ${module} module_upper)
	if(NOT PY_${module_upper})
		if(ARGC GREATER 1 AND ARGV1 STREQUAL "REQUIRED")
			set(PY_${module}_FIND_REQUIRED TRUE)
		endif()
		# A module's location is usually a directory, but for binary modules
		# it's a .so file.
		execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c"
			"import re, ${module}; print(re.compile('/__init__.py.*').sub('',${module}.__file__))"
			RESULT_VARIABLE _${module}_status
			OUTPUT_VARIABLE _${module}_location
			ERROR_QUIET
			OUTPUT_STRIP_TRAILING_WHITESPACE)
		if(NOT _${module}_status)
			set(PY_${module_upper} ${_${module}_location} CACHE STRING
				"Location of Python module ${module}")
		endif()
	endif()
	find_package_handle_standard_args(PY_${module}
		"couldn't find python module ${module}:
		\nfor debian systems try: \
		\n\tsudo apt-get install python-${module} \
		\nor for all other OSs/debian: \
		\n\tsudo -H pip install ${module}\n" PY_${module_upper})
	#if (NOT PY_${module}_FOUND)
		#message(FATAL_ERROR "python module not found, exiting")
	#endif()
endfunction(px4_find_python_module)