Gumtreebot

bot.js

var request = require("request");
var parser = require("xml2json");
var db = require("dirty")("db.db");
var nodemailer = require("nodemailer");
var transport = nodemailer.createTransport("Sendmail");

db.on('load', function() {
  request('http://www.gumtree.com/rssfeed/single-room-flatshare/shoreditch', function (err, response, body) {
    if(err){
      throw err;
    }
    
    var json = JSON.parse(parser.toJson(body));
    
    var items = json.rss.channel.item;
    
    items.forEach(function(item){
      try {
        var title = item.title;
        var price = /([0-9]+)pw$/.exec(title)[1];
        var content = item["content:encoded"].replace(/\&\#[0-9]+;/g," ");
        var link = item.link;
      
        if(price < 150){
          return;
        }
      
        if(db.get(link) === true){
          return;
        }
        
        db.set(link, true);
      
        var emails = ["person1@example.com", "person2@example.com"];
        
        emails.forEach(function(email){
          var mailOptions = {
              from: "gumtreebot@example.com",
              to: email,
              subject: "GUMTREE: " + title,
              text: link + "\n\n\n" + content
          }
                    
          transport.sendMail(mailOptions);
        });
      
      } catch(e){
        console.error(e.stack || e);
      }
    });
  });
});

crontab

*/5 *    * * * /opt/node/bin/node /home/pita/Code/gumtreebot/bot.js > /dev/null