text: var gulp = require('gulp');
  var runSequence = require('run-sequence');
  var express     = require('express');
  var createError = require('http-errors');
  var express = require('express');
  var path = require('path');
  var cookieParser = require('cookie-parser');
  var logger = require('morgan');
  
  var indexRouter = require('./routes/index');
  var studentsRouter = require('./routes/students');
  
  gulp.task('server:start', function(callback){
    
    const port = 8080;
    const app = express();
    
    //view engine setup
    app.set('views', path.join(__dirname, 'views'));
    app.set('view engine', 'pug');
  
    app.use(logger('dev'));
    app.use(express.json());
    app.use(express.urlencoded({ extended: false }));
    app.use(cookieParser());
    app.use(express.static(path.join(__dirname, 'public')));
  
    app.use('/', indexRouter);
    app.use('/students', studentsRouter);
  
    // catch 404 and forward to error handler
    app.use(function(req, res, next) {
      next(createError(404));
    });
  
    // error handler
    app.use(function(err, req, res, next) {
      // set locals, only providing error in development
      res.locals.message = err.message;
      res.locals.error = req.app.get('env') === 'development' ? err : {};
  
      // render the error page
      res.status(err.status || 500);
      res.render('error');
    });
    
    app.listen(port, () => console.log(`Example app listening on port ${port}!`));  
    
    callback();
  });
  
  gulp.task('build', function(callback){
    
    console.log('Running build gulp task...');
    
    callback();
  });