yt4github.js

// ==UserScript==
// @name         Serokell YouTrack link renderer for github pull requests.
// @namespace    http://serokell/io
// @version      1.0
// @description  Turns Serokell YT ticket id in PR's name into a link.
// @author       Martoon
// @match        https://github.com/*/pull*
// @grant        none
// ==/UserScript==

function applyYt4Github() {
    'use strict';

    var logName = "yt4github: "

    var titleElem = document.getElementsByClassName("js-issue-title")[0]
    if (titleElem == undefined) {
        return;
    }

    var title = titleElem.innerHTML.trim()

    if (title.charAt(0) != '['){
        return;
    }

    var splitTitle = title.split("]", 2)
    var ticket=splitTitle[0].split("[", 2)[1]
    var bareTitle=splitTitle[1].trim()

    titleElem.innerHTML = '<a href="https://issues.serokell.io/issue/' + ticket + '" target="_blank">[' + ticket + ']</a> ' + bareTitle
};

// Thanks to AJAX, we cannot perform the action once.
setInterval(applyYt4Github, 500)