const fs = require("fs");

const Twit = require("twit");

const { CONSUMER_KEY, CONSUMER_SECRET, ACCESS_TOKEN, ACCESS_TOKEN_SECRET } = process.env;

const tweetLength = 280;

// Twitter always considers t.co links to be 23 chars, see https://help.twitter.com/en/using-twitter/how-to-tweet-a-link

const twitterLinkLength = 23;

const T = new Twit({

consumer_key: CONSUMER_KEY,

consumer_secret: CONSUMER_SECRET,

access_token: ACCESS_TOKEN,

access_token_secret: ACCESS_TOKEN_SECRET,

});

(async () => {

const githubEvent = JSON.parse(fs.readFileSync(0).toString());

const tweets = [];

for (const commit of githubEvent["commits"]) {

const authorLine = `Author: ${commit["author"]["name"]}`;

const maxMessageLength = tweetLength - authorLine.length - twitterLinkLength - 2; // -2 for newlines

const commitMessage =

commit["message"].length > maxMessageLength

? commit["message"].substring(0, maxMessageLength - 2) + "…" // Ellipsis counts as 2 characters

: commit["message"];

tweets.push(`${commitMessage}\n${authorLine}\n${commit["url"]}`);

}

for (const tweet of tweets) {

try {

await T.post("statuses/update", { status: tweet });

} catch (e) {

console.error("Failed to post a tweet!", e.message);

}

}

})();