Add a button on Github commit page which allow you to nevigate to the first commit page
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// ==UserScript==
// @name Go To Initial Commit
// @namespace https://github.com/Liu233w/
// @version 0.1
// @description Add a button on Github commit page which allow you to nevigate to the first commit page
// @author Liu233w
// @license BSD 3-Clause License
// @icon https://assets-cdn.github.com/pinned-octocat.svg
// @match https://github.com/*/commits/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
function openFirstCommit(args) {
// args[1] is the `orgname/repo` url fragment
// args[2] is the optional branch or hash
return fetch('https://api.github.com/repos/' + args[1] + '/commits?sha=' + (args[2] || ''))
// the link header has additional urls for paging
// parse the original JSON for the case where no other pages exist
.then(res => Promise.all([res.headers.get('link'), res.json()]))
// get last page of commits
.then(results => {
// results[0] is the link
// results[1] is the first page of commits
if (results[0]) {
// the link contains two urls in the form
// <https://github.com/...>; rel=blah, <https://github.com/...>; rel=thelastpage
// split the url out of the string
var pageurl = results[0].split(',')[1].split(';')[0].slice(2, -1);
// fetch the last page
return fetch(pageurl).then(res => res.json());
}
// if no link, we know we're on the only page
return results[1];
})
// get the last commit and extract the url
.then(commits => commits.pop().html_url)
// navigate there
.then(url => window.location = url);
}
// add button
var nav = document.querySelector('.file-navigation');
var tempDom = document.createElement('div');
tempDom.innerHTML = '<span type="button" class="btn btn-sm" title="go to the initial(first) commit">initial commit</button>';
var button = tempDom.firstChild;
button.addEventListener('click', function () {
openFirstCommit(window.location.pathname.match(/\/([^\/]+\/[^\/]+)(?:\/tree\/([^\/]+))?/));
});
nav.appendChild(button);
})();