Turn your laptop to alarm clock

I bumped into an article describing rtcwake here, so I thought it will be cool to write a nice wrapper script around it.
It was also an excuse to master some more bash scripting and the use of "date" command.

There are many many other implementations for rtcwake script, like here for example, and I've seen some other cases in the Ubuntu forums, after I finished writing mine. So with out further a do, here is my solution, which is easy to use:

#!/bin/bash

#       GoodMorning.sh
#       
#       Copyright 2011 Oz Nahum <nahumoz_ATTNOSP_gmail.com>
#       
#       This program is free software; you can redistribute it 
#       and/or modify it under the terms of the GNU General 
#       Public License as published by the Free Software 
#       Foundation; either version 3 of the License, or
#       (at your option) any later version.
#       
#       This program is distributed in the hope that it will 
#       be useful, but WITHOUT ANY WARRANTY; without even the
#       implied warranty of MERCHANTABILITY or FITNESS FOR A
#       PARTICULAR PURPOSE.  See the GNU General Public 
#       License for more details.
#       

if [ $5 ] && [ $5 !=  "test" ]; then
    PLAYLIST=$5
    PLAYER=$4
else
    PLAYLIST=$4
fi

if [ $PLAYER ] && [ $PLAYER = "mplayer" ] ; then
   PLAYER="mplayer -playlist"
else
   PLAYER=$4
fi


#echo "player is" $PLAYER
case "$1" in

    "")
        echo "  usage: GoodMorning.sh --help to see this how to use that script"
        exit 1
        ;;
    
    "--help")
        echo "  GoodMorning.sh [--set|--configure]   "
        echo " "
        echo "  Options:"
        echo "  --set"
        echo "  --configure"
        echo ""
        echo "  GoodMorning.sh --set   [player|playlist]"
        echo "      will set the correct time for the script to wake the computer "
        echo "       with a lovely playlist."
        echo " "
        echo "  GoodMorning.sh --configure "
        echo "      will add the specified  to the sudoers list, so that rtcwake" 
        echo "      can be called without promting for password. This option is not yet"
        echo "      implemented. This option is only available with sudo or as root..."
        ;;  

    "--set")
        IN=$3
        arrIn=(${IN//:/ })
        
        echo "will set up wake up to ${arrIn[0]}:${arrIn[1]} $2"
        TODAY=`date +%F`
        TODAY_IN_SEC=`date --date=$TODAY +%s`
        TIME=`date -d "$2 00:00:00" +%s`
        
        WAKE_UP_TIME=$(($TIME+3600*${arrIn[0]}+60*${arrIn[1]}))
        
        echo "date to wake up" `date --date "1970-01-01 $WAKE_UP_TIME sec" "+%Y-%m-%d %T"`
        # check if testing mode
        if [ "$5" = "test" ] || [ "$6" = "test" ]; then

            echo "testing only", $PLAYER, $PLAYLIST
            sudo rtcwake -t $WAKE_UP_TIME -m on -v && $PLAYER $PLAYLIST         
        else
            sudo rtcwake -t $WAKE_UP_TIME -m mem -v && $PLAYER $PLAYLIST        
        fi
        ;;
    "--configure")

        if  [[ $EUID -ne 0 ]]; then
            echo "This script must be run as root" 1>&2
            exit 1
        fi
        
        echo "Will add user " $2 "to sudoers file so that,"
        echo "$2 will be able to call it without password"
      
        echo "$2 ALL= NOPASSWD: /usr/sbin/rtcwake" >> /etc/sudoers
        ;;
esac