Mastodon RSS to Twitter (via IFTTT, with some transformation)

script.ts

// Trim Mastodon RSS feed and add a reference to the original status URL
// This needs the Pro+ feature "Filter Code" blocks on IFTTT

let status_text = Feed.newFeedItem.EntryContent;
let status_url = Feed.newFeedItem.EntryUrl;
const tweet_max_length = 280;

// reference to original mastodon post
let footer = "\n\n(from ".concat(status_url).concat(")");

// if status + footer is shorter than twitter max chars, post as is
// longer ones get trimmed with ellipsis added...
let tweet_text = "";
if (status_text.length < (tweet_max_length - footer.length)) {
	tweet_text = status_text.concat(footer);
} else {
	let status_trim = status_text.substring(0, (tweet_max_length - footer.length - 3));
	tweet_text = status_trim.concat("...").concat(footer);
}

Twitter.postNewTweet.setTweet(tweet_text);