colorized logs

log.sh

#!/usr/bin/env bash
# colorize log thanks to Radu Cotescu  (https://radu.cotescu.com/coloured-log-outputs/)


TAIL=`which tail`
AWK=`which awk`
if [[ -z $TAIL ]]; then
    echo -e "Cannot find tail executable.\n"
    exit 1
fi
if [[ -z $AWK ]]; then
    echo -e "Cannot find awk executable.\n"
    exit 1
fi

CWD=`dirname $0`

declare -A log
log["INFO"]="BWhite"
log["ERROR"]="BRed"
log["WARN"]="BYellow"
log["DEBUG"]="BGreen"

if [[ -f "$CWD/ctail.config" ]]; then
    source "$CWD/ctail.config"
fi

declare -A colours
# Regular
colours["Black"]="\033[0;30m"
colours["Red"]="\033[0;31m"
colours["Green"]="\033[0;32m"
colours["Yellow"]="\033[0;33m"
colours["Blue"]="\033[0;34m"
colours["Purple"]="\033[0;35m"
colours["Cyan"]="\033[0;36m"
colours["White"]="\033[0;37m"
#Bold
colours["BBlack"]="\033[1;30m"
colours["BRed"]="\033[1;31m"
colours["BGreen"]="\033[1;32m"
colours["BYellow"]="\033[1;33m"
colours["BBlue"]="\033[1;34m"
colours["BPurple"]="\033[1;35m"
colours["BCyan"]="\033[1;36m"
colours["BWhite"]="\033[1;37m"
# High Intensity
colours["IBlack"]="\033[0;90m"
colours["IRed"]="\033[0;91m"
colours["IGreen"]="\033[0;92m"
colours["IYellow"]="\033[0;93m"
colours["IBlue"]="\033[0;94m"
colours["IPurple"]="\033[0;95m"
colours["ICyan"]="\033[0;96m"
colours["IWhite"]="\033[0;97m"
# Bold High Intensity
colours["BIBlack"]="\033[1;90m"
colours["BIRed"]="\033[1;91m"
colours["BIGreen"]="\033[1;92m"
colours["BIYellow"]="\033[1;93m"
colours["BIBlue"]="\033[1;94m"
colours["BIPurple"]="\033[1;95m"
colours["BICyan"]="\033[1;96m"
colours["BIWhite"]="\033[1;97m"

AWK_EXPRESSION=""
for i in "${!log[@]}"; do
    AWK_EXPRESSION="/$i/ {print \"${colours[${log[$i]}]}\" \$0 \"\033[39m\"} $AWK_EXPRESSION"
done

$TAIL "$@" | $AWK "$AWK_EXPRESSION"