#!/usr/bin/env python

import os
import sys
import re

def usage():
	print """usage: %s header...""" % (os.path.basename(sys.argv[0]))

def main():
	if len(sys.argv) < 2:
		usage()
		sys.exit()

	overwrite = False
	first = 1
	if len(sys.argv) >= 2 and sys.argv[1] == '-f':
		overwrite = True
		first = 2

	p = re.compile('[a-zA-Z0-9._-]+\.h')
	for f in sys.argv[first:]:
		if not p.match(f):
			print "Invalid header filename '%s'. Header not created" % f
			continue

		if not overwrite and os.path.exists(f):
			print "Header file '%s' already exists. Use -f to override." % f
			continue

		print "Creating %s..." % f
		q = re.compile('[.-]')
		define = q.sub('_', f.upper())
		f = open(f, 'w')
		f.write('#ifndef _%s_\n' % define)
		f.write('#define _%s_\n\n' % define)
		f.write('/* TODO: Your code here */\n\n')
		f.write('#endif /* _%s_ */' % define)
		f.close()

	print "Finished"

if __name__ == '__main__':
	main()