#!/usr/bin/env python3

import sys
import json
import yaml
import subprocess

jqexpression = sys.argv[1]

jqprocess = subprocess.Popen(["jq", "-r", jqexpression], stdin=subprocess.PIPE, text=True)

document = [d for d in yaml.safe_load_all(sys.stdin)][-1]

json.dump(document, jqprocess.stdin)