class CmdDisplayChangedUSEs(Command):

	"""List all packages that have had their USE flags changed"""

	def __init__(self):

		self.default_opts = {

			"rawoutput": 0

			}

	def parseArgs(self, args):

		opts = self.default_opts

		need_help = 0		

		for i in args:

			if i in ["-r", "--rawoutput"]:

				opts["rawoutput"] = 1

			if i in ["-h", "--help"]:

				need_help = 1

		if need_help:

			print self.longHelp()

			sys.exit(-1)

		return opts

	def perform(self, args):

		opts = self.parseArgs(args)

		raw = opts["rawoutput"]

		output = []

		if not raw:

			print "Fetching list of installed packages ..."

		matches = gentoolkit.find_all_installed_packages()

		if not raw:

			print "Comparing USE flags ..."

			print

		num = len(matches)

		current = 0

		nrchars = 0

		for p in matches:

			bestver = "=" + p.get_cpv()

			# Don't continue if the package no longer exists in portage

			if not gentoolkit.find_packages(bestver):

				continue

			useflags = gentoolkit.settings["USE"].split()

			iuse = p.get_env_var("IUSE")

			if iuse:

				usevar = iuse.split()

			else:

				usevar = []

			used = p.get_use_vars().split()

			list = []

			for u in usevar:

				inuse = 0

				inused = 0

				if u in useflags:

					inuse = 1

				if u in used:

					inused = 1

				list.append((inuse, inused, u))

			doprint = 0

			uselist = []

			if list:

				for inuse, inused, u in list:

					if inuse != inused:

						# These USE flags shouldn't be set by users anyway.

						if u not in ["bootstrap", "build", "livecd", "selinux"]:

							doprint = 1

							if inuse:

								uselist.append(red("+" + u))

							else:

								uselist.append(blue("-" + u))

			current += 1

			if doprint:

				if raw:

					print bestver

				output.append((bestver, uselist))

			s = str(len(matches) - current) + " packages to go (" + str(len(output)) + " candidates found)"

			if not raw:

				sys.stdout.write(nrchars * "\b \b" + s)

				sys.stdout.flush()

			nrchars = len(s)

		if not raw:

			sys.stdout.write(nrchars * "\b \b")

			sys.stdout.flush()

			print "Done!"

			print

			if len(output):

				print "These are the packages with changed USE flags:"

				print

				for pkg, uselist in output:

					print "  " + darkgreen(pkg[1:]) + " ",

					for u in uselist:

						print u,

					print

			else:

				print "All packages are compiled with the current USE flags.  Exiting ..."

			print

	def shortHelp(self):

		return yellow("<local-opts>") + " - list packages that have had their USE flags changed"

	def longHelp(self):

		return "List all packages that have had their USE flags changed\n" + \

		     "\n" + \

		     "Syntax:\n" + \

				 "  " + green("changeduse") + yellow(" <local-opts>\n") + \

				 "\n" + \

				 yellow("<local-opts>") + " is either of:\n" + \

				 "  " + yellow("-r, --rawoutput") + " - output raw depend atoms\n"

	"changeduse": CmdDisplayChangedUSEs(),