Tampermonkey script that converts references to JIRA on GitHub PR title

github-link-lasso-jira.user.js

// ==UserScript==
// @name         Add link to Lasso Jira on GitHub
// @namespace    io.lassomarketing.js
// @version      1.0.0.1
// @description  Converts references to Lasso JIRA issues on GitHub into clickable link
// @author       Alexey Nikitin
// @homepage     https://github.com/M-r-A
// @updateURL    https://gist.githubusercontent.com/M-r-A/8bfa49a76b31a3d6099ef5066f21ea81/raw/github-link-lasso-jira.user.js
// @downloadURL  https://gist.githubusercontent.com/M-r-A/8bfa49a76b31a3d6099ef5066f21ea81/raw/github-link-lasso-jira.user.js
// @match        https://github.com/Lasso-Marketing/*
// @run-at       document-end
// ==/UserScript==

(function () {
    'use strict';

    const jiraUrl = "https://iqviadigital.atlassian.net/browse/";
    const jiraKeyRegex = /([A-Z][A-Z0-9]{1,9}-[0-9]+)/g;

    const classMarker = "jira-link"

    const setLink = titleElement => {
        let jiraReference = titleElement.innerHTML.match(jiraKeyRegex);
        if (jiraReference != null) {
            titleElement.innerHTML = titleElement.innerHTML.replace(jiraKeyRegex, function (jiraRef) {
                return `<a href="${jiraUrl}${jiraRef}">${jiraRef}</a>`;
            });
        }
        titleElement.classList.add(classMarker);
    };

    var observer = new MutationObserver(function (mutations, me) {
        const titleElement = document.getElementsByClassName('js-issue-title')[0];
        if (titleElement && !titleElement.classList.contains(classMarker)) {
            setLink(titleElement);
            return;
        }
    });

    observer.observe(document, {
        childList: true,
        subtree: true
    });
})();