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Go To Initial Commit

Add a button on Github commit page which allow you to nevigate to the first commit page

当前为 2018-02-07 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Go To Initial Commit
  3. // @namespace    https://github.com/Liu233w/
  4. // @version      0.1
  5. // @description  Add a button on Github commit page which allow you to nevigate to the first commit page
  6. // @author       Liu233w
  7. // @license      BSD 3-Clause License
  8. // @icon         https://assets-cdn.github.com/pinned-octocat.svg
  9. // @match        https://github.com/*/commits/*
  10. // @grant        none
  11. // ==/UserScript==
  12.  
  13. (function() {
  14.   'use strict';
  15.  
  16.   function openFirstCommit(args) {
  17.     // args[1] is the `orgname/repo` url fragment
  18.     // args[2] is the optional branch or hash
  19.  
  20.     return fetch('https://api.github.com/repos/' + args[1] + '/commits?sha=' + (args[2] || ''))
  21.  
  22.     // the link header has additional urls for paging
  23.     // parse the original JSON for the case where no other pages exist
  24.       .then(res => Promise.all([res.headers.get('link'), res.json()]))
  25.  
  26.     // get last page of commits
  27.       .then(results => {
  28.       // results[0] is the link
  29.       // results[1] is the first page of commits
  30.  
  31.       if (results[0]) {
  32.         // the link contains two urls in the form
  33.         // <https://github.com/...>; rel=blah, <https://github.com/...>; rel=thelastpage
  34.         // split the url out of the string
  35.         var pageurl = results[0].split(',')[1].split(';')[0].slice(2, -1);
  36.         // fetch the last page
  37.         return fetch(pageurl).then(res => res.json());
  38.       }
  39.  
  40.       // if no link, we know we're on the only page
  41.       return results[1];
  42.     })
  43.  
  44.     // get the last commit and extract the url
  45.       .then(commits => commits.pop().html_url)
  46.  
  47.     // navigate there
  48.       .then(url => window.location = url);
  49.   }
  50.  
  51.   // add button
  52.   var nav = document.querySelector('.file-navigation');
  53.   var tempDom = document.createElement('div');
  54.   tempDom.innerHTML = '<span type="button" class="btn btn-sm" title="go to the initial(first) commit">initial commit</button>';
  55.   var button = tempDom.firstChild;
  56.   button.addEventListener('click', function () {
  57.     openFirstCommit(window.location.pathname.match(/\/([^\/]+\/[^\/]+)(?:\/tree\/([^\/]+))?/));
  58.   });
  59.   nav.appendChild(button);
  60. })();