XML podcast feed utility

item-adder.js

const fs = require('fs');
const xml2js = require('xml2js');

const parser = new xml2js.Parser();
const builder = new xml2js.Builder();

const createFeedItem = ({
  title,
  filePath,
  callback
}) => {
  const fileName = filePath.split('/').slice(-1)[0];
  const size = fs.statSync(filePath).size;
  const guessedDuration = Math.round(size/1000000) + 2;
  let duration = '01:00:00';
  if (guessedDuration >= 60) {
    duration = `01:0${guessedDuration - 60}:00`;
  } else {
    duration = `00:${guessedDuration}:00`;
  }

  return {
    title: [title],
    guid: [`http://----/ricky-gervais-show-xfm/episodes/${fileName}`],
    description: [title],
    enclosure: [{
      '$': {
        url: `http://----/ricky-gervais-show-xfm/episodes/${fileName}`,
        length: String(size),
        type: 'audio/mpeg',
      },
    }],
    category: ['Comedy'],
    pubDate: [new Date().toUTCString()],
    'itunes:author': ['Ricky Gervais, Stephen Merchant, Karl Pilkington'],
    'itunes:subtitle': [title],
    'itunes:summary': [title],
    'itunes:duration': [duration],
  };
}

const feed = fs.readFileSync(`${__dirname}/feed.xml`);
parser.parseString(feed, (error, result) => {
  result.rss.channel[0].lastBuildDate = new Date().toUTCString();
  result.rss.channel[0].item = [];
  fs.readdirSync(`${__dirname}/episodes`).forEach(file => {
    result.rss.channel[0].item.push(createFeedItem({
      title: file,
      filePath: `${__dirname}/episodes/${file}`,
    }));
  });
  fs.writeFileSync('feed.xml', builder.buildObject(result));
});