BASH responsive while you type .sh

#! /bin/bash

trap 'echo "Exiting..."; exit 1' SIGINT

up='[A'
down='[B'
right='[C'
left='[D'

special=""
character=""
input=""

redraw() {
    clear
    echo "Input: $input"
}

handle_special_character() {
    echo "Special Character: $special"
}

redraw

while true
do
    if read -t 1 -n 1 -s -r
    then
        character="$( echo -e "$REPLY" | cat -v )"

        if [ "$character" = "^[" ]
        then
            special="$character"
            continue
        elif [ -n "$special" ]
        then
            special="${special}$character"
            if [ "$character" = "[" ]
            then
                continue
            else
                handle_special_character
                special=""
                continue
            fi
        fi

        if [ "$character" = "^?" ]
        then
            if [ ${#input} -gt 0 ]
            then
                input="${input:0:$((${#input}-1))}"
            fi
        elif [ ${#character} -eq 1 ]
        then
            input="${input}$character"
        elif [ ${#character} -eq 0 ]
        then
            echo "Submitted!"
            break
        fi

        redraw
    else
        :
    fi
done