`choose_from_menu()` bash function

choose_from_menu.sh

# in-place shell selection list
# original by Guss: https://askubuntu.com/a/1386907
# improvements: syntax cleanup, shellcheck-linted, cyclic menu selection, compatible with `set -e`
#
# example usage:
#   apples=("Red Delicious" "Granny" "Cosmic Crisp")
#   choose_from_menu "Select an apple:" chosen "${apples[@]}"
#   echo "You chose: $chosen"
function choose_from_menu() {
	local -r prompt="$1" outvar="$2" options=("${@:3}")
	local -i cur=0 count=${#options[@]} index=0
	local esc
	esc=$(echo -en "\e") # cache ESC as test doesn't allow esc codes
	printf "%s\n" "$prompt"
	while true; do
		# list all options (option list is zero-based)
		index=0
		for o in "${options[@]}"; do
			if ((index == cur)); then
				echo -e " >\e[7m$o\e[0m" # mark & highlight the current option
			else
				echo "  $o"
			fi
			index=$((index+1))
		done
		IFS= read -rs -n3 key             # wait for user to key in arrows or ENTER
		if [[ $key == "${esc}[A" ]]; then # up arrow
			cur=$((cur-1))
			((cur < 0)) && cur=$((count - 1))
		elif [[ $key == "${esc}[B" ]]; then # down arrow
			cur=$((cur+1))
			((cur >= count)) && cur=0
		elif [[ $key == "" ]]; then # nothing, i.e the read delimiter - ENTER
			break
		fi
		echo -en "\e[${count}A" # go up to the beginning to re-render
	done
	# export the selection to the requested output variable
	printf -v "$outvar" "%s" "${options[$cur]}"
}