01_depth_usage.mjs

// -*- coding: utf-8, tab-width: 2 -*-

import 'p-fatal';

import aux from './02_depth_aux';
import pProps from './03_depth_naive';

const { deepDump, identity, soon, detectState } = aux;

const deployment = soon({
  'host alice.test': {
    'osUser ftpalice': soon({
      props: { home: '/var/www/alice/htdocs' },
      currentState: detectState(),
    }),
    'ftpUser alice': soon({
      props: { osUser: 'ftpalice' },
      currentState: detectState(),
    }),
  },
  'host bob.test': soon({
    'osUser ftpbob': {
      props: { remove: true },
      currentState: detectState(),
    },
    'ftpUser bob': soon({
      props: { remove: true },
      currentState: detectState(),
    }),
  }),
});

const managedStuff = pProps(deployment, identity, { depth: 1 });
deepDump(managedStuff);
const survey = pProps(deployment, identity, { depth: 2 });
deepDump(survey);

02_depth_aux.mjs

// -*- coding: utf-8, tab-width: 2 -*-

import nodeUtil from 'util';
import pDelay from 'promise-delay';

const aux = {

  async deepDump(pr) {
    const x = await pr;
    console.log(nodeUtil.inspect(x, { depth: null }));
  },

  async identity(x) { return x; },

  async soon(x) {
    await pDelay(5);
    return x;
  },


  async detectState() {
    await pDelay(3e3);
    return 'ok';
  },

};

export default aux;

03_depth_naive.mjs

// -*- coding: utf-8, tab-width: 2 -*-

import pPropsOrig from 'p-props';

async function pProps(dictPr, refine, opts) {
  const { depth } = opts;
  const dict =  await dictPr;
  if (!dict) { return dict; }
  if (!depth) { return pPropsOrig(dict, refine); }
  const subOpt = { depth: depth - 1 };
  function subProps(val) { return pProps(val, refine, subOpt); }
  return pPropsOrig(dict, subProps);
}

export default pProps;