# Copyright 2004 Perforce Corporation, Inc. All rights reserved.

import os
import marshal
def runp4cmd(p4cmd):
	""" Return the output from the Perforce command,
	and assume that the user put the '-G' in the options
	to get us marshall output.  We always return an array
	for the results."""

	fd = os.popen(p4cmd, 'rb')
	results = []
	while 1:
		try:
			d = marshal.load(fd)
			results.append(d)
		except EOFError:
			break
	fd.close()
	return results

def SubtractTwoHashes(list1, list2):
   '''find the things in list1 that aren't in list2,
   those in list2 (but not list1), and in common.
   Return those three results as a three-tuple.
   '''
   OnlyList1res = []
   OnlyList2res = []
   Duplicates = []
   for l in list1.keys():
     if list2.has_key(l) and list2[l]:
        Duplicates.append(l)
     else:
        OnlyList1res.append(l)
   for l in list2.keys():
     if list1.has_key(l) and list1[l]:
        pass   # no need to duplicate the above entirely
     else:
        OnlyList2res.append(l)
   return [OnlyList1res, OnlyList2res, Duplicates]