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#!/bin/bash
if [ "a$1" == "a--help" ] || [ "a$1" == "a-h" ]; then
cat <<EOF
Usage: $0 [-i] \`tty\` "Option A" "Option B"
Displays the user in the provided tty all the options and lets the user select an option with their keys.
Prints the selected option (or the (0-based) index of that option with the -i flag) to the default stdout.
Exits with code 1 if the user aborted the selection with q.
EOF
fi
printidx=0
if [ "a$1" == "a-i" ]; then
printidx=1
shift
fi
tty="$1"
shift
options=("${@}")
optionslength=${#options[@]}
sel=0
printf "\e[s" >"$tty"
while true; do
printf "\e[u\e[s\e[K" >"$tty"
for ((i = 0; i < optionslength; i++)); do
if [ "$i" -eq $sel ]; then
printf "\e[30;47m" >"$tty"
fi
printf "%s\e[40;37m " "${options[$i]}" >"$tty"
done
case "$(./readkey <"$tty")" in
left)
sel=$((sel - 1))
;;
right)
sel=$((sel + 1))
;;
q)
printf "\e[u\e[KSelection aborted\n" >"$tty"
exit 1
;;
enter)
break
;;
esac
if ((sel < 0)); then
sel=0
fi
if ((sel >= optionslength)); then
sel=$((optionslength - 1))
fi
done
printf "\e[u\e[KSelected %s\n" "${options[$sel]}" >"$tty"
if [ "$printidx" -eq 1 ]; then
echo "$sel"
else
echo "${options[$sel]}"
fi
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