#!/bin/bash


#!/bin/bash

indent_level="-1"
print_indent () {
	for NUM in `seq 0 $indent_level`; do echo -ne '    '; done
}

while read line; do
	case "$line" in
        ('('*')'|'<'*'>')
            print_indent
            echo "$line" 
            ;;
        ('>'|')') # lone close bracket
            indent_level=$(( $indent_level - 1 ))
            print_indent
            echo "$line"
            ;; 
        (*'>'|*')') # non-lone 
            print_indent
            echo "$line" | sed 's/[)>]$//'
            indent_level=$(( $indent_level - 1 ))
            print_indent
            echo $( echo "$line" | tail -c2 )
            ;;
        ('<'*|'('*)
            print_indent
            indent_level=$(( $indent_level + 1 ))
            echo "$line"
            ;;
        (*)
            print_indent
            echo "$line"
        ;;
    esac
done <<<"$( sed 's/</\n</g' | sed 's/>/>\n/g' | sed 's/,/,\n/g' )"