# Test for the existence of a specified Python Module
#
# From http://ompl.hg.sourceforge.net/hgweb/ompl/ompl/file/tip/CMakeModules/FindPython.cmake


if(DEFINED PYTHON_EXECUTABLE)

function(find_python_module module)
	string(TOUPPER ${module} module_upper)
	if(NOT PY_${module_upper})
		if(ARGC GREATER 1 AND ARGV1 STREQUAL "REQUIRED")
			set(${module}_FIND_REQUIRED TRUE)
		endif()
		# A module's location is usually a directory, but for binary modules
		# it's a .so file.
		execute_process(COMMAND "${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 ${module}")
		endif(NOT _${module}_status)
	endif(NOT PY_${module_upper})
	find_package_handle_standard_args(PY_${module} DEFAULT_MSG PY_${module_upper})
endfunction(find_python_module)

endif(DEFINED PYTHON_EXECUTABLE)