My Edited Version of Casey Liss's Auto Tweet Posting in the Camel Blogging Engine

tweetLatestPost.js

// Automatic posting to Twitter
function tweetLatestPost() {
  if (twitterClient !== null && typeof(process.env.TWITTER_CONSUMER_KEY) !== 'undefined') {
    twitterClient.get('statuses/user_timeline', {screen_name: twitterUsername}, function (error, tweets) {
      if (error) {
        console.log(JSON.stringify(error, undefined, 2));
        return;
      }

      var lastUrl = null, i = 0;
      while (lastUrl === null && i < tweets.length) {
        if (tweets[i].source.has(twitterClientNeedle) &&
          tweets[i].entities &&
          tweets[i].entities.urls &&
          tweets[i].entities.urls.length > 0) {
          lastUrl = tweets[i].entities.urls[0].expanded_url;
        } else {
          i += 1;
        }
      }

      allPostsSortedAndGrouped(function (postsByDay) {
        // Defines the latest post
        var latestPost = postsByDay[0].articles[0];
        // Link for the Tweet
        var link = latestPost.metadata.SiteRoot + latestPost.metadata.relativeLink;
        // Prefix of the Tweet
        if (latestPost.metadata.Link !== 'undefined') {
          var prefix = '→ ';
        } else {
            var prefix = '🐺 ';
        }

        // Title/text for the Tweet
        if (lastUrl !== link) {
          console.log('Tweeting new link: ' + link);

          // Figure out how many characters we have to play with.
          // Aka: what should comprise the tweet?
          twitterClient.get('help/configuration', function (error, configuration, response) {

            // Image for the Tweet
            // This assumes that every `Image:` will be a self-hosted one
            var image = latestPost.metadata.SiteRoot + latestPost.metadata.Image;

            // I didn't want a new line after the title
            // var suffix = " \n\n";
            var suffix = " ";

            // The 140 --> 280 change happened sometime in 2017 I think
            var maxSize = 240 - configuration.short_url_length_https - prefix.length - suffix.length - image.length;

            // Shorten the title if need be.
            var title = latestPost.metadata.Title;
            if (title.length > maxSize) {
              title = title.substring(0, maxSize - 3) + '...' + ' ';
            }

            var params = {
              status: prefix + title + link + suffix + image
            };
            twitterClient.post('statuses/update', params, function (error, tweet, response) {
                if (error) {
                  console.log(JSON.stringify(error, undefined, 2));
                }
            });
          });
        } else {
            console.log('Twitter is up to date.');
        }
      });
    });
  }
}