How to use the harp.mount function in harp

assets.cssPrecompiled()
    );
    var cssPath = '/css/' + cssFilename;
    exports.cssFiles.length = 0;
    exports.cssFiles.push(cssPath);

    /* Make the files available */
    app.use(st({ path: assetsDir, url: '/js', index: false }));
    app.use(st({ path: assetsDir, url: '/css', index: false }));
    console.log('Done');
  } else {
    /* Dev mode */
    app.use( '/js', harp.mount( path.join(process.cwd(), 'front/js') ) );
    app.use( '/css', harp.mount( path.join(process.cwd(), 'front/css') ) );
  }
  app.use( '/html', harp.mount( path.join(process.cwd(), 'front/html') ) );
  app.use( '/bower_components', harp.mount( path.join(process.cwd(), 'front/bower_components') ) );

  /* Render the main index */
  app.set( "views", viewDir );
  app.set('view engine', viewEngine);
  if (!production) app.locals.pretty = true;
  app.get('/', frontend.index);

  /* Provide routes to render the index with preloaded data */
  _(handlers).where({ method: 'get' }).forEach(function (handler) {
    var path = handler.path.replace(/^\/api/, '');
    app.get(path, function (req, res, next) {
      req.handler = handler;
      frontend.index(req, res, next);
    });
  });

var express = require('express')
var harp = require('harp')
var logfmt = require('logfmt')
var merge = require('merge')
var cors = require('cors')
var translate = require('wikipedia-translator')
var wikipedias = require('wikipedias')
var app = module.exports = express()

if (process.env.NODE_ENV !== "test") app.use(logfmt.requestLogger());
app.use(express.static(__dirname + "/public"))
app.use(harp.mount(__dirname + "/public"));
app.set('view engine', 'jade');

app.get('/', cors(), function(req, res) {

  var locals = {
    wikipedias: wikipedias,
    hostname: req.hostname
  }

  // Support the old URL format
  if (req.query.query) {
    var url = require("url").format({
      pathname: "/search",
      query:req.query
    })
    return res.redirect(url)

var express = require('express')
var harp = require('harp')
var logger = require('morgan')
var body_parser = require('body-parser')
var mailer = require('./mailer')

var app = express()

var logger_format = ':remote-addr - - [:date] ":method :url" :status ":referrer" ":user-agent"'
app.use(express.static(__dirname + '/_public'))
app.use(logger(logger_format))
app.use(harp.mount(__dirname + '/_public'))

// to get the contact form data
app.use(body_parser.json())
app.use(body_parser.urlencoded({ extended: true }))

app.post('/contact-submit', function (req, res, next) {
  var payload = {
    email: req.body.email,
    name: req.body.name,
    message: req.body.message
  }
  if (!payload.email || !payload.name || !payload.message) {
    return res.send(400, 'One of the fields is missing...')
  }

  mailer(payload, function (err, response) {

app.configure(function () {
    app.use(express.cookieParser('play me off keyboard cat'));
    app.use(express.session({ secret: "keyboard cat", cookie: { maxAge: 1000*60*60*24*365 }}));
    app.use(flash());
    app.use(express.json());
    app.use(express.urlencoded());
    app.use(express.methodOverride());
    app.use(busboy());
    app.use(harp.mount(projectPath));
    app.use(express.static(__dirname + "/public"));
    app.use(dynHelpers.helpers(editor));
    app.set("view engine", "jade");
    app.set('views', __dirname + '/views');
    // Just needed to parse html files
    app.engine('html', require('ejs').renderFile);
  });

app.use('/quill.js', respond.bind(this, 'main'));
app.use('/test/quill.js', respond.bind(this, 'test'));
app.use('/quill.snow.css', function(req, res, next) {
  res.setHeader('Content-Type', 'text/css');
  fs.readFile('./src/themes/snow/snow.styl', function(err, data) {
    var s = stylus(data.toString());
    s.include('./src/themes/snow');
    s.define('url', stylus.url());
    s.render(function(err, css) {
      res.write(css);
      res.end();
    })
  });
});
app.use(harp.mount(__dirname + '/..'));

app.listen(9000);
console.info('Quill development server listening on port 9000');

app.use(logger('dev'));
    app.use(bodyParser.json());
    app.use(bodyParser.urlencoded({
        extended: true
    }));
    app.use(cors({ origin: false }));
    app.use(cookieParser());
    app.use(compress());
    app.use(express.static(config.root + '/public'));
    app.use(methodOverride());
    app.use(passport.initialize());
    app.disable('x-powered-by');
    app.use(require('prerender-node').set('prerenderToken', process.env.PRERENDER));

    //Initialize HarpJS
    app.use(harp.mount(config.root + "/public"));

    var api    = glob.sync(config.root + "/app/modules/**/api/*.js");
    var routes = glob.sync(config.root + "/app/modules/**/routes/*.js");
    routes.forEach(function(route){
        require(route)(app);
    });

    api.forEach(function(route){
        //get api name prefix
        app.use('/api', require(route)(app));
    });

    app.get('*', function(request, response) {
        response.render("index", { user : request.user });
    });
};