ansible/hosts.py

#!/usr/bin/env python3

import json
import sys
import yaml

def parse(path):
  with open(path, 'r') as stream:
    try:
      data = yaml.safe_load(stream)
    except yaml.YAMLError as e:
      return AnsibleError(e)
  ret = { "all": { "hosts": list(), "vars": dict(), "children": list() } , "_meta": { "hostvars": {} } }
  for host, groups in data.items():
    ret["all"]["hosts"].append(host)
    if groups is not None:
      for group in groups:
        if not group in ret:
          ret[group] = dict()
          ret[group]["hosts"] = list()
          ret[group]["vars"] = dict()
          ret[group]["children"] = list()
        if not host in ret[group]["hosts"]:
          ret[group]["hosts"].append(host)
  return ret

print(json.dumps(parse("hosts.yml")))