nyks/child_process/exec.js

"use strict";

const cp = require('child_process');
const once  = require('../function/once');

//callback(err, exit, lastline);
module.exports = function(cmd /*, options, chain*/) {

  var args = Array.from(arguments);
  var chain    = once(args.pop());
  cmd      = args.shift();
  var options  = args.shift() || {};

  if(Array.isArray(options))
    options = { args : options};

  var ps   = cp.spawn(cmd, options.args || [], options);
  var _stdout = "";
  var _stderr = "";

  ps.on('error', chain);

  ps.stdout.on('data', function(data) { _stdout += data; });
  ps.stderr.on('data', function(data) { _stderr += data; });

  ps.on('close', function(exit) {
    return chain(exit, _stdout, _stderr);
  });

  return ps;
};