from systemfuncs import systemFunctions
from outpututils import rewriteIfChanged

import sys

def iterSystemFuncsHeader(functionResults):
	yield '// Automatically generated by build system.'
	for makeName in sorted(
		func.getMakeName() for func in systemFunctions
		):
		yield '#define HAVE_%s %d' % (makeName, functionResults[makeName])

def getSystemFuncsInfo():
	return dict.fromkeys(
		(func.getMakeName() for func in systemFunctions),
		False
		)

if __name__ == '__main__':
	if len(sys.argv) == 2:
		rewriteIfChanged(
			sys.argv[1],
			iterSystemFuncsHeader(getSystemFuncsInfo())
			)
	else:
		print('Usage: python3 systemfuncs2code.py CONFIG_HEADER ', file=sys.stderr)
		print(
			'Note: Should only be called directly on systems '
			'where the probe does not work.',
			file=sys.stderr
			)
		sys.exit(2)