Colored xtrace output

color_trace.sh

#!/bin/bash

SCRIPT="$1"

# Remove the script name from positional parameters
shift

echo "Arguments passed: $@"
echo "Total number of arguments: $#"

UNIQUE_STR='@@@'

COLOR=5

normal()
{
    tput sgr0 # tell the terminal to not style the output
}

colored()
{
    tput setaf $COLOR # tell the terminal to set forward color to $COLOR
}

export PS4="+${UNIQUE_STR}" # artificially insert $UNIQUE_STR to the trace
exec &> >(sed "s/\(\+\)*\+\(${UNIQUE_STR}\)\(.*\)$/$(colored)\1+\3$(normal)/") # see below

promptyn () {
    while true; do
        echo "$1"
        read -r yn
        case $yn in
            [Yy]* ) return 0;;
            [Nn]* ) return 1;;
            * ) echo "Please answer yes or no.";;
        esac
    done
}

promptyn 'proceed with script and args? (y/n) ?' || exit 1

set -x # set trace

source "$SCRIPT" "$@" # run the commands in the current shell so that all settings apply