server.js

var express = require("express");

var hbs = require("handlebars");

var exphbs = require("express-handlebars");

var app = express();

var PORT = process.env.PORT || 8080;

// Serve static content for the app from the "public" directory in the application directory.
app.use(express.static("public"));

// Parse application body as JSON
app.use(express.urlencoded({ extended: true }));
app.use(express.json());

app.engine("handlebars", exphbs({ defaultLayout: "main" }));
hbs.registerHelper("ifCond", function(v1, operator, v2, options) {
  switch (operator) {
    case "==":
      return v1 == v2 ? options.fn(this) : options.inverse(this);
    case "===":
      return v1 === v2 ? options.fn(this) : options.inverse(this);
    case "!=":
      return v1 != v2 ? options.fn(this) : options.inverse(this);
    case "!==":
      return v1 !== v2 ? options.fn(this) : options.inverse(this);
    case "<":
      return v1 < v2 ? options.fn(this) : options.inverse(this);
    case "<=":
      return v1 <= v2 ? options.fn(this) : options.inverse(this);
    case ">":
      return v1 > v2 ? options.fn(this) : options.inverse(this);
    case ">=":
      return v1 >= v2 ? options.fn(this) : options.inverse(this);
    case "&&":
      return v1 && v2 ? options.fn(this) : options.inverse(this);
    case "||":
      return v1 || v2 ? options.fn(this) : options.inverse(this);
    default:
      return options.inverse(this);
  }
});
app.set("view engine", "handlebars");

// Import routes and give the server access to them.
var routes = require("./controllers/grocery_controller.js");

app.use(routes);

// Start our server so that it can begin listening to client requests.
app.listen(PORT, function() {
  // Log (server-side) when our server has started
  console.log("Server listening on: http://localhost:" + PORT);
});