org-protocol-github-repo.user.js

// ==UserScript==
// @name           org-protocol-github-repo
// @description    Insert Emacs links for files on github
// @author         Raimon Grau Cusco <raimonster@gmail.com>
// @include        https://github.com/*
// @version        0.1.0
// @grant          none
// @license        LGPL http://www.gnu.org/licenses/lgpl.html
// ==/UserScript==


var insertAfter = function(e,i){
     if(e.nextSibling){
         e.parentNode.insertBefore(i,e.nextSibling);
     } else {
         e.parentNode.appendChild(i);
     }
};

var url = document.URL;
var project = document.URL.match(/github.com\/([^/]+\/[^/]+)/)[1];
var repoTitle = document.querySelectorAll("get-repo");

var mydiv = document.createElement("div");
mydiv.classList = "d-none d-md-flex ml-2";
var cloneLink = document.createElement("a");
cloneLink.classList = "btn btn-primary";

cloneLink.appendChild(document.createTextNode("Clone"));

cloneLink.href = "org-protocol://github-clone://" + project;
mydiv.appendChild(cloneLink);
var title = repoTitle[0].parentNode;
insertAfter(title, mydiv);