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import string
import iutil
import os
from time import *
from snack import *
from textw.constants import *
from text import _

class TimezoneWindow:

    def getTimezoneList(self, test):
	if not os.access("/usr/lib/timezones.gz", os.R_OK):
            if test:
                cmd = "./gettzlist"
                stdin = None
            else:
                zoneList = iutil.findtz('/usr/share/zoneinfo', '')
                cmd = ""
                stdin = None
	else:
	    cmd = "/usr/bin/gunzip"
	    stdin = os.open("/usr/lib/timezones.gz", 0)

        if cmd != "":
            zones = iutil.execWithCapture(cmd, [ cmd ], stdin = stdin)
            zoneList = string.split(zones)

	if (stdin != None):
            os.close(stdin)

	return zoneList

    def updateSysClock(self):
	if os.access("/sbin/hwclock", os.X_OK):
	    args = [ "/sbin/hwclock" ]
	else:
	    args = [ "/usr/sbin/hwclock" ]

	args.append("--hctosys")
	if self.c.selected():
	    args.append("--utc")

	iutil.execWithRedirect(args[0], args)
	self.g.setTimer(500)
	self.updateClock()

    def updateClock(self):
	if os.access("/usr/share/zoneinfo/" + self.l.current(), os.R_OK):
	    os.environ['TZ'] = self.l.current()
	    self.label.setText(self.currentTime())
	else:
	    self.label.setText("")

    def currentTime(self):
	return "Current time: " + strftime("%X %Z", localtime(time()))

    def __call__(self, screen, todo, test):
	timezones = self.getTimezoneList(test)
	rc = todo.getTimezoneInfo()
	if rc:
	    (default, asUtc, asArc) = rc
	else:
	    default = "US/Eastern"
	    asUtc = 0

	bb = ButtonBar(screen, [(_("OK"), "ok"), (_("Back"), "back")])
	t = TextboxReflowed(30, 
			_("What time zone are you located in?"))

	self.label = Label(self.currentTime())
		
	self.l = Listbox(5, scroll = 1, returnExit = 0)

        for tz in timezones:
	    self.l.append(tz, tz)

	self.l.setCurrent(default)
	self.l.setCallback(self.updateClock)
	self.updateClock()

	self.c = Checkbox(_("Hardware clock set to GMT?"), isOn = asUtc)
	self.c.setCallback(self.updateSysClock)

	self.g = GridForm(screen, _("Time Zone Selection"), 1, 5)
	self.g.add(t, 0, 0)
	self.g.add(self.label, 0, 1, padding = (0, 1, 0, 0), anchorLeft = 1)
	self.g.add(self.c, 0, 2, padding = (0, 1, 0, 1), anchorLeft = 1)
	self.g.add(self.l, 0, 3, padding = (0, 0, 0, 1))
	self.g.add(bb, 0, 4, growx = 1)
	self.g.setTimer(500)

	result = "TIMER"
	while result == "TIMER":
	    result = self.g.run()
	    if result == "TIMER":
		self.updateClock()

	screen.popWindow()

        button = bb.buttonPressed(result)

        if button == "back":
            return INSTALL_BACK

	todo.setTimezoneInfo(self.l.current(), asUtc = self.c.selected())

	return INSTALL_OK