ncr.js

function ncr(router){
  var path = process.argv.slice(2);
  var current, i;
  var next = router;

  for(i=0; i<path.length; i++){
    current = next;
    next = next[path[i]];
    if (typeof next === 'object') continue; else break;
  }

  if (typeof next === 'function'){
    var args_needed = next.toString().match(/^(function|)\s*\S*\s*\((.*?)\)/)[2]
          .split(',').filter(function(item){return item.trim() !== ''});
    var args = path.slice(i+1);
    if (args_needed.length !== 0 && args.length !== args_needed.length ){
      throw new Error('Command "'+path[i]+'" need agruments: '+args_needed.map(function(item){return '<'+item+'>'}).join(' '));
    } else {
      return next.apply(current, args);
    }
  } else if (typeof next === 'object'){
    if (typeof next['?'] === 'function') return next['?'].apply(next, path.slice(i+1));
    throw new Error('Need more arguments, like '+JSON.stringify(Object.keys(next).filter(function(item){return item !== '?'})))
  } else {
    throw new Error('Command "'+path[i]+'" not found. Do you mean '+JSON.stringify(Object.keys(current).filter(function(item){return item !== '?'})))
  }
}