#!/bin/bash
#GFILE=/var/log/mail.log
GFILE=mail.log
#GFILE=test.log
if [[ -z $1 ]] || [[ $4 ]]
then
        echo 'You need to specify between 1 and 3 variables of input.'
        exit
fi

EMAIL="[A-Za-z0-9\.\$\_\-]*@[A-Za-z0-9\.\$\_\-]*"
IPADD="[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
RED="\033[1;31m&\033[0m"
GREEN="\033[1;92m&\033[0m"
BLUE="\033[1;34m&\033[0m"
PINK="\033[1;95m&\033[0m"
CYAN="\033[1;96m&\033[0m"
more=()

more+=('gsub("'"$1"'", "'"$RED"'");')
more+=('gsub("'"$EMAIL"'", "'"$GREEN"'");')
more+=('gsub("'"$IPADD"'", "'"$BLUE"'");')

if [[ $2 ]]
then
more+=('gsub("'"$2"'", "'"$CYAN"'");')
fi

if [[ $3 ]]
then
more+=('gsub("'"$3"'", "'"$PINK"'");')
fi

grep $1 $GFILE | gawk --re-interval '{ printf '%s\n' "${more[@]}"} print }'