chr() {

[ "$1" -lt 256 ] || return 1

printf "\\$(printf '%03o' "$1")"

}

ord() {

LC_CTYPE=C printf '%d' "'$1"

}

DEMOS=(Blank Hello Chatroom Notes TodoMVC)

export DEMOS_AMOUNT=${#DEMOS[@]}

CONT=true

while [ "$CONT" == "true" ]

echo

for i in "${!DEMOS[@]}"

do

printf "%s: %s\n" "$(chr $((97 + $i )))" "${DEMOS[$i]}"

done

echo -n -e "\nChoose demonstration to launch ('a'…'$(chr $((96 + $DEMOS_AMOUNT)))'): "

read DEMO

export FILE=${DEMOS[$(($(ord $DEMO) - 97))]}

[ -f examples/$FILE/main.rb ] && cd examples && CONT=false && ruby -I../atlastk $FILE/main.rb