Dumb Bash Goto

goto.sh

# shellcheck shell=bash

goto() {
	local current_file="$0"
	local label="$1"

	# shellcheck disable=SC1090
	source <(
		local eval_line='no'

		local regex=$'[ \t]*: :'"$label"
		while read -r line || [ -n "$line" ]; do
			if [ "$eval_line" = 'yes' ]; then
				printf '%s\n' "$line"
			else
				# Preserve line numbers
				printf '%s\n' "#$line"

				if [[ "$line" =~ $regex ]]; then
					eval_line=yes
				fi
			fi
		done < "$current_file"; unset line
	)

	exit
}

declare -i n=0
: :LABEL1
main() {
	n=$((n+1))
	printf '%d\n' "$n"

	if ((n == 10)); then
		printf '%s\n' "Done."
		return 0
	fi

	goto LABEL1
}

main "$@"