a bit o' spruce, from http://play.spruce.cf

spruce.json

{"flavor":"1.16.1","prune":["meta"],"env":["HOME=/home/user"],"cherry_pick":[],"yaml":[{"filename":"file1.yml","contents":"---\n  boshes:\n    proto:\n      #tagged:  [proto] # defaults to env name, overridable\n      url:      https://sandbox.example.com:25555\n      ca_cert:  (( vault \"secret/bosh/sandbox/ssl/ca:certificate\" ))\n      username: sb-admin\n      password: (( vault \"secret/bosh/sandbox/admin:password\" ))\n      stemcells:\n      - bosh-lite\n\n      \n envs: # optional - no env = use bosh of same name\n   sandbox: {on: proto}\n   preprod: {on: proto}\n   prod:    {on: proto}\n   \n   #sandbox: {on: sandbox}\n   #preprod: {on: preprod}\n   #prod:    {on: prod}\n     \n layout: |\n   sandbox -\u003e preprod -\u003e prod\n   auto sandbox\n   auto preprod\n"}],"skip_eval":false,"fallback_append":false,"go_patch":false,"debug":false,"trace":false}