#! /usr/bin/env python

import sys, os

def main():
	"""u2m.py [infiles]\n\nConvert UNIX-style line breaks ('\\n') to mac style ('\\r')."""
	
	# note the excessive error-checking!
	
	args = sys.argv[1:]
	if len(args) == 0 or args[0].lower() in 'h -h help -help'.split():
		print main.__doc__
		sys.exit(0)
		
	for arg in args:
		try:
			instr = open(arg).read()
		except IOError:
			print "Error reading file %s" % arg
			continue
		
		filename = os.path.split(arg)[1]
		tempname = '/tmp/' + filename
		
		try:
			outfile = open(tempname,'w')
			outfile.write(instr.replace('\n','\r'))
		except IOError:
			print "Error creating file %s" % tempname
			continue
			
		try:
			os.rename(tempname, arg)
		except IOError:
			print "Error moving %s to %s" % (tempname, arg)
			continue
			
		print 'Converted %s to mac format'	% arg
			
main()