#!/usr/bin/python

# ==================================================
# By David M. Andersen
# University of North Carolina at Charlotte
# http://www.dmatech.org/
# danderse@uncc.edu
# ==================================================
# http://www.python.org/doc/2.2.2/lib/typesmapping.html
# http://www.python.org/doc/2.2.2/lib/types.html
# http://www.dmatech.org/~dma/epy/portage/html/
# Fixed to work with package.use, and some other minor
# fixes, by ferret <james.noble@worc.ox.ac.uk>.

import os,sys,portage,string,re,commands,traceback,types
from stat import *
from output import *

sys.path.insert(0, "/usr/lib/portage/pym")
sys.path.insert(0, "/usr/lib/gentoolkit/pym")
import gentoolkit

def intersection(a, b):
	map_a = {}
	retlist = []
	for item in a:
		map_a[item] = 1

	for item in b:
		if map_a.has_key(item):
			retlist.append(item)

	return retlist

def getcompuseflags(ebuild):
	path = vt.getebuildpath(ebuild)
	path = os.path.join(os.path.dirname(path),"USE")

	try:
		myfile = open(path,"r")
	except Exception, e:
		return ["NOT_FOUND"]

	line = string.rstrip(myfile.readline())
	myfile.close()
	return string.split(line, " ")

def diff_use(old, new):
	old.sort()
	new.sort()

	map_old = {}
	map_new = {}

	only_in_new = []
	only_in_old = []

	# Unadulterated evil ahead next 20 lines or so.

	for item in old:
		map_old[item] = 1
	
	for item in new:
		map_new[item] = 1
		if item not in map_old:
			only_in_new.append(item)
	for item in old:
		if item not in map_new:
			only_in_old.append(item)

	return len(only_in_old)+len(only_in_new)


##############################################################

if (not sys.stdout.isatty()) or (portage.settings["NOCOLOR"] in ["yes","true"]):
	nocolor()

# Current useflags:
#   portage.usesplit
#
# Relevant useflags for a package:
#   portage.portdb.aux_get(x, ["IUSE"])

#sys_use=portage.usesplit

root="/"
vt=portage.db[root]["vartree"]


for node in vt.getallnodes():
	x=vt.resolve_key(node)
	matches=vt.dbapi.match(x)
	for x in matches:
		try:
			iuse=string.split(portage.portdb.aux_get(x, ["IUSE"])[0]," ")
		except Exception, e:
			pass
		comp_use=getcompuseflags(x)
		sys_use=gentoolkit.find_packages("="+x)[0].get_settings("USE").split()
		ilc=intersection(iuse, comp_use)
		ils=intersection(iuse, sys_use)
		if (diff_use(ilc,ils)) > 0:
			print x