#!/bin/bash
#################################
#   Author - Kulbir Saini       #
#   Home - http://sain.ico.in/  #
#################################
 
#shell script to filter mails.
echo -e -n "\033[32mWelcome to the mail filter system \nWhat do you want to do? \nCheck mails on basis of \n1) Sender... \n2) Receiver... \n3) Subject... \n4) Quit... \nPress(1,2,3,4): \033[0m"
read int <&2
while [[ 1 ]];do
while [[ 1 ]];do
count=0;	line=""
if [[ $int == 1 ]];then
	echo -n -e "\033[32mFrom:\033[0m "
	read from <&2
	i=0
	clear
	while read line ;do
	loopbreak=0;	nextmessagestatus=1;	mailtostatus=1;		mailsubstatus=1;	stat=1;
	toecho=`echo $line | grep -E "^From:+" | grep -E "${from}"`
	if [ "$toecho" != "" ];then
		i=`expr $i + 1`
		echo -e "${toecho}"
		while read line ; do
		mailto=`echo $line | grep -E "^To:+"`
		mailsub=`echo $line | grep -E "^Subject:+"`
		if [[ "$mailto" != "" ]] && [[ $mailtostatus == 1 ]];then
			echo $mailto
			mailtostatus=0
		fi
		if [[ "$mailsub" != "" ]] && [[ $mailsubstatus == 1 ]];then
			echo $mailsub
			mailsubstatus=0
		fi
		if [[ $mailtostatus == 0 ]] && [[ $mailsubstatus == 0 ]] && [[ $stat == 1 ]];then
			echo -e "\033[33mStarting of the Message${i}:\033[0m"
			stat=0
		fi
		fromstatus=`echo $line | grep -E "^X-UID:+"`
			if [[ $fromstatus != "" ]];then
			while read line; do
				loopstatus=`echo $line | grep -E "^From +"`
				if [[ $loopstatus != "" ]];then
				loopbreak=1
				break
				fi
				echo $line
			done
			if [[ $loopbreak == 1 ]];then
			echo -e -n "\033[33mEnd of the Message${i}.\nDisplay next message(y/n):\033[0m"
			read messagestatus <&2
			if [[ "$messagestatus" == "y" ]];then
				clear
			else
				nextmessagestatus=0
			fi
			break
			fi
			fi
		done
		count=`expr $count + 1`
	fi
	if [[ $nextmessagestatus == 0 ]];then
		break
	fi
	done
	if [[ $count == 0 ]];then
		echo -e "\033[32mNo mail(s) From: ${from}.\n\033[0m"
	else
		echo -e "\033[32mTotal $count mail(s) From: ${from}.\n\033[0m"
	fi
elif [[ $int == 2 ]];then
	echo -n -e "\033[32mTo: \033[0m"
	read to <&2
	i=0
	clear
	while read line ;do
	loopbreak=0;	nextmessagestatus=1
	toecho=`echo $line | grep -E "^To:+" | grep -E "${to}"`
	if [[ "$toecho" != "" ]];then
		echo -e "$toecho"
		i=`expr $i + 1`
		while read line; do
			tostatus=`echo $line | grep -E "^X-UID:+"`
			if [[ $tostatus != "" ]];then
			echo -e "\033[33mStarting of the Message${i}:\033[0m"
			while read line; do
				loopstatus=`echo $line | grep -E "^From +"`
				if [[ $loopstatus != "" ]];then
				loopbreak=1
				break
				fi
				echo $line
			done
			if [[ $loopbreak == 1 ]];then
			echo -e -n "\033[33mEnd of the Message${i}. \nDisplay next message(y/n): \033[0m"
			read messagestatus <&2
			if [[ $messagestatus == "y" ]];then
				clear
			else
				nextmessagestatus=0
			fi
			break
			fi
			fi
		done
		count=`expr $count + 1`
	fi
	if [[ $nextmessagestatus == 0 ]];then
		break
	fi
	done
	if [[ $count == 0 ]];then
		echo -e "\033[32mNo mail(s) to: ${to}.\n\033[0m"
	else 
		echo -e "\033[32mTotal $count mail(s) To: ${to}.\n\033[0m"
	fi
elif [[ $int == 3 ]];then
	echo -n -e "\033[32mSubject:\033[0m "
 
	read subject <&2
	clear
	i=0
	while read line ;do
	loopbreak=0;	nextmessagestatus=1
	toecho=`echo $line | grep -E "^Subject:+" | grep -E "${subject}"`
	if [[ "$toecho" != "" ]];then
		echo "$toecho"
		i=`expr $i + 1`
		while read line; do
		substatus=`echo $line | grep -E "^X-UID:+"`
		if [[ $substatus != "" ]];then
		echo -e "\033[33mStarting of the Message${i}:\033[0m"
		while read line ; do
			loopstatus=`echo $line | grep -E "^From +"`
			if [[ $loopstatus != "" ]];then
			loopbreak=1
			break
			fi
			echo $line
		done
		if [[ $loopbreak == 1 ]];then
		echo -e -n "\033[33mEnd of the message${i}. \nDisplay next message(y/n): \033[0m"
		read messagestatus <&2
		if [[ $messagestatus == "y" ]];then
			clear
		else
			nextmessagestatus=0
		fi
		break
		fi
		fi
		done
		count=`expr $count + 1`
	fi
	if [[ $nextmessagestatus == 0 ]];then
		break
	fi
	done
	if [[ $count == 0 ]];then
		echo -e "\033[32mNo mail(s) with Subject: ${subject}.\n\033[0m"
	else
		echo -e "\033[32mTotal $count mail(s) with Subject: ${subject}.\033[0m\n"
	fi
elif [[ $int == 4 ]];then
	echo -e "\033[32mThank you for using this utility. \nPlease visit again.\033[0m"
	exit
else
	echo -e "\033[32mI could not understand that. \nPlease try again.\033[0m\n"
fi
echo -e -n "\033[32m1) Sender... \n2) Receiver... \n3) Subject... \n4) Quit... \nPress(1,2,3,4):\033[0m "
read int <&2
break
done < mbox 
done