code: function discover(cb) {
    return function (host, args) {
      if (!args) {
        args = host || {};
        host = 'localhost';
      }
      function resultCb(result) {
        console.log(text.__('Jenkins ver. %s is running on %s'),
            result.hudson.version[0],
            (result.hudson.url && result.hudson.url[0]) ? result.hudson.url[0] : host);
      }
      function jenkinsCb(jenkins) {
        jenkins.discover(host, cli.exitCb(null, resultCb));
      }
      cb(args, jenkinsCb);
    };
  }
docs: Get a handler that calls Jenkins API to discover a Jenkins instance on specified host.
  
  @param {Function} cb: callback for argument handling
  @return Jenkins API handler function