express recursive routing with namespace

express-recursive-routing.js

var fs = require('fs');
var path = require('path');

var walk = function(dir, done) {
  var results = {};
  fs.readdir(dir, function(err, list) {
    if (err) {
      return done(err);
    }
    var i = 0;
    var next = function() {
      var file = list[i];
      i += 1;
      if (!file) {
        return done(null, results);
      }
      file = dir + '/' + file;
      fs.stat(file, function(err, stat) {
        if (stat && stat.isDirectory()) {
          walk(file, function(err, res) {
            results[path.basename(file)] = res;
            next();
          });
        } else {
          results[path.basename(file, '.js')] = file;
          next();
        }
      });
    };
    next();
  });
};

var addNamespace = function(app, ns, tree) {
  app.namespace('/' + ns, function() {
    addRoute(app, tree);
  });
};

var addRoute = function(app, tree) {
  for ( var i in tree) {
    if (typeof tree[i] == 'string') {
      var module = require(tree[i]);
      if (module.routes) {
        module.routes(app);
      }
    } else {
      addNamespace(app, i, tree[i]);
    }
  }
};

module.exports = function(app) {
  walk('./routes', function(err, tree) {
    addRoute(app, tree);
  });
};