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跳转到第一次提交

在 Github 的 commits 页面添加一个按钮，可以跳转到 repo 的第一次提交页面

当前为 2018-02-14 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Go To Initial Commit
  3. // @name:zh-CN   跳转到第一次提交
  4. // @namespace    https://github.com/Liu233w/
  5. // @version      0.1
  6. // @description  Add a button on Github commit page which allow you to nevigate to the first commit page
  7. // @description:zh-CN 在 Github 的 commits 页面添加一个按钮，可以跳转到 repo 的第一次提交页面
  8. // @author       Liu233w
  9. // @license      BSD 3-Clause License
  10. // @icon         https://assets-cdn.github.com/pinned-octocat.svg
  11. // @match        https://github.com/*/commits/*
  12. // @grant        none
  13. // ==/UserScript==
  14.  
  15. (function() {
  16.   'use strict';
  17.  
  18.   function openFirstCommit(args) {
  19.     // args[1] is the `orgname/repo` url fragment
  20.     // args[2] is the optional branch or hash
  21.  
  22.     return fetch('https://api.github.com/repos/' + args[1] + '/commits?sha=' + (args[2] || ''))
  23.  
  24.     // the link header has additional urls for paging
  25.     // parse the original JSON for the case where no other pages exist
  26.       .then(res => Promise.all([res.headers.get('link'), res.json()]))
  27.  
  28.     // get last page of commits
  29.       .then(results => {
  30.       // results[0] is the link
  31.       // results[1] is the first page of commits
  32.  
  33.       if (results[0]) {
  34.         // the link contains two urls in the form
  35.         // <https://github.com/...>; rel=blah, <https://github.com/...>; rel=thelastpage
  36.         // split the url out of the string
  37.         var pageurl = results[0].split(',')[1].split(';')[0].slice(2, -1);
  38.         // fetch the last page
  39.         return fetch(pageurl).then(res => res.json());
  40.       }
  41.  
  42.       // if no link, we know we're on the only page
  43.       return results[1];
  44.     })
  45.  
  46.     // get the last commit and extract the url
  47.       .then(commits => commits.pop().html_url)
  48.  
  49.     // navigate there
  50.       .then(url => window.location = url);
  51.   }
  52.  
  53.   // add button
  54.   var nav = document.querySelector('.file-navigation');
  55.   var tempDom = document.createElement('div');
  56.   tempDom.innerHTML = '<span type="button" class="btn btn-sm" title="go to the initial(first) commit">initial commit</button>';
  57.   var button = tempDom.firstChild;
  58.   button.addEventListener('click', function () {
  59.     openFirstCommit(window.location.pathname.match(/\/([^\/]+\/[^\/]+)(?:\/tree\/([^\/]+))?/));
  60.   });
  61.   nav.appendChild(button);
  62. })();