#!/bin/sh
#(c) Copyright Barry Kauler 2007 www.puppylinux.com
#2007 Lesser GPL licence v2 (http://www.fsf.org/licensing/licenses/lgpl.html)
#utility to select the timezone.
#Note, as Puppy will mostly be on PCs coexisting with Windows,
#hardware clock (CMOS) is set to local time (see /etc/rc.d/rc.local0)
#BK oct2007: updated for 3.02
#w019 april 2009: cli mode so can run from /etc/rc.d/rc.update
# 13feb10 rewrite fully by shinobar, accept options

usage() {
  MYNAME=$(basename $0)
  echo "usage: $MYNAME [newtimezone]
	$MYNAME cli
		ask timezone with console dialog
    $MYNAME --load
        set timezone according /etc/localtime
	$MYNAME  --list
		show available choice"
  exit 1
}
loadtimezone() {
  #need to set Linux system time/date, from hardware clock...
  hwclock --hctosys --localtime
  #...--hctosys reads cmos clock to system, referencing /usr/share/zoneinfo/localtime
  #...--localtime means that cmos clock is set to local-time.

  # correct timestamp
  touch /etc/rc.d/BOOTCONFIG
}
newtimezone() {
  #validity check...
  echo "$ZONEINFO" | grep -qw "$ZONERETVAL" || return
 
  echo $ZONERETVAL| grep -q 'GMT' && \
    ZONERETVAL=$(echo $ZONERETVAL| tr '-' 'x'| tr '+' '-'| tr 'x' '+')
  echo "$ZONERETVAL" | grep -q '/' || ZONERETVAL="Etc/$ZONERETVAL"
 
  rm -f /etc/localtime
  ln -s /usr/share/zoneinfo/$ZONERETVAL /etc/localtime

  rm -f /etc/TZ #don't think need this anymore. also removed from /etc/profile.
  #.../etc/profile now reads /etc/localtime and exports TZ variable.

  loadtimezone
}

case "$1" in
  *-lo*)
    if [ -f /etc/localtime; then
      loadtimezone
      exit
    fi
    shift
	;;
esac

LANGORG=$LANG
export LANG=C

CZONE='/usr/share/zoneinfo/Etc/UTC'
[ -L /etc/localtime ] && CZONE=$(readlink /etc/localtime)
DEFTAG=$(echo $CZONE| sed -e 's%/usr/share/zoneinfo/%%' -e 's%Etc/%%')
echo $DEFTAG| grep -q 'GMT' && \
  DEFTAG=$(echo $DEFTAG| tr '-' 'x'| tr '+' '-'| tr 'x' '+') 

ZONEINFO=$(find /usr/share/zoneinfo -type f  -printf '%P\n'| grep -v -E '(GMT|\.tab$)'| sed -e 's%Etc/%%'|sort)
GMTS="GMT-12 Eniwetok
GMT-11 Samoa
GMT-10 Alaska,Hawaii
GMT-9 Alaska
GMT-8 Los_Angeles
GMT-7 Alberta,Montana,Arizona
GMT-6 Mexico_City,Saskatchewan
GMT-5 Bogota,Lima,New_York
GMT-4 Caracas,La_Paz,Canada
GMT-3 Brasilia,Buenos_Aires,Georgetown
GMT-2 mid-Atlantic
GMT-1 Azores,CapeVerdes
GMT+0 London,Dublin,Edinburgh,Lisbon,Reykjavik,Casablanca
GMT+1 Paris,Berlin,Amsterdam,Brussels,Madrid,Stockholm,Oslo
GMT+2 Athens,Helsinki,Istanbul,Jerusalem,Harare
GMT+3 Kuwait,Nairobi,Riyadh,Moscow
GMT+4 Abu_Dhabi,Muscat,Tblisi,Volgograd,Kabul
GMT+5 Islamabad,Karachi
GMT+6 Almaty,Dhaka
GMT+7 Bangkok,Jakarta
GMT+8 Perth,Singapore,Hongkong
GMT+9 Tokyo
GMT+10 Guam
GMT+11 Magadan,Soloman_Is.
GMT+12 Wellington,Fiji,Marshall_Islands
GMT+13 Rawaki_Islands
GMT+14 Line_Islands"
GMTINFO=$(echo "$GMTS"| cut -d ' ' -f1)
if [ "$DEFTAG" != "" ]; then
	ZONEINFO=$(echo $DEFTAG; echo "$ZONEINFO" |grep -v "$DEFTAG")
fi
ZONECHOICES=$(echo "$ZONEINFO"| sed -e 's/$/ ./')	# add ' .' at tail for dummy
ZONECHOICES="$ZONECHOICES
$GMTS"
ZONEINFO="$ZONEINFO
$GMTINFO"

XSTATUS="no"
[ "$DISPLAY" ] && XSTATUS="yes"
# check parameter
[ $# -le 1 ] || usage
if [ $# -eq 1 ]; then
  case "$1" in
  *-li*) 
	echo "$ZONECHOICES"
	exit
	;;
  -*) usage;;
  cli) XSTATUS="no";;
  *)
	ZONERETVAL=$1
    newtimezone || usage
    exit
	;;
  esac
fi 

if [ "$XSTATUS" = "yes" ];then
 ZONEDLG="Xdialog --stdout --title \"Puppy timezone selector\" --default-item $DEFTAG --menubox \"Please choose your timezone.\\nIf a city/region/country in your timezone is not listed, choose a GMT<number>\" 0 0 0 $ZONECHOICES"
 eval $ZONEDLG >/tmp/zoneretval
else
 ZONEDLG="dialog --aspect 10 --title \"Puppy timezone selector\" --default-item $DEFTAG --menu \"Please choose your timezone. If a city/region/country in your timezone is not listed, choose a GMT<number>\" 0 0 0 ${ZONECHOICES}"
 eval $ZONEDLG 2>/tmp/zoneretval
fi

[ $? -ne 0 ] && exit

ZONERETVAL="`cat /tmp/zoneretval`"

newtimezone

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