#!/bin/bash
#
#Author: Adam Bumpus <adam@bumpus.com>
#Date: 01/19/2001
#Last Modified: 08/13/2001
#
#This script compares my mail spool against a 30 second old copy. If there
# are any differences it sends a message to my cellular phone containing
#the From: and Subject lines of the message that changed.
#
#08/13/2110: fixed some bonehead bugs. If you have the 08/06/2001 version
#change to this one now.
#
#08/06/2001: updated script. Renamed some variables for clarity and improved
#system for checking for new mail. The new system counts messages rather than
#lines in the spool, this should help prevent blank or duplicate messages from
#being sent to a phone.
#Also added a configuration values section to make it easier for people who are
#not me to use this script.
#
#phonenumber should be pretty easy to fill in
#mailspool describes where your mail is stored on your unix system
#a common place is /var/mail/username or /var/spool/mail/username.
#url1 and url2 will depend on your provider. The example values filled
#in here are for US Cellular. Other systems will be similar in format,
#but different in the exact details.
#
#Todo: 	Update to avoid messages on deleteing mail. DONE
#	Change to send web requests rather than e-mail DONE
#	Include some message body of incoming e-mail
#	Fix Problems after deleting e-mails DONE
#	eliminate need to copy mail spool DONE
#

#CONFIGURATION VALUES
phonenumber=###########
mailspool=/var/spool/mail/username
url1="http://scripts.textmsg.com/xscripts/senduscc.idc?number=$phonenumber&message="
url2="&Send=Send"
deletefile="senduscc.idc*"
#********

#setup baselines for mailbox
oldlines=`wc $mailspool | awk '{print $1}'`
oldmessages=`grep ^Message-I $mailspool -c | awk '{print $1}'`

#initialize currentlines and currentmessages to known safe values
currentlines=$oldlines
currentmessages=$oldmessages

while true ; do
currentlines=`wc $mailspool | awk '{print $1}'`
currentmessages=`grep ^Message-I $mailspool -c | awk '{print $1}'`
sendalert=`echo "$currentmessages > $oldmessages" | bc`
boxempty=`echo "$currentmessages < $oldmessages" | bc`

###Reset counters if mailbox size decreases
if [ $boxempty = "1" ]
then
        oldmessages=$currentmessages
        oldlines=$currentlines
fi

###Send the alert if there is new mail
if [  $sendalert = "1"  ] ;
then
	tail -n `echo "$currentlines - $oldlines" | bc` $mailspool >> temp
	fromline=`grep ^From: temp`
	subjectline=`grep ^Subject: temp`
        wget "$url1$fromline$subjectline$url2" > /dev/null
	rm temp
	rm $deletefile
	oldmessages=$currentmessages
	oldlines=$currentlines
fi
sleep 30
done