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GitHub Image Preview

A userscript that adds clickable image thumbnails

当前为 2016-05-18 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name          GitHub Image Preview
  3. // @version       1.0.2
  4. // @description   A userscript that adds clickable image thumbnails
  5. // @license       https://creativecommons.org/licenses/by-sa/4.0/
  6. // @namespace     http://github.com/Mottie
  7. // @include       https://github.com/*
  8. // @run-at        document-idle
  9. // @grant         GM_addStyle
  10. // @grant         GM_getValue
  11. // @grant         GM_setValue
  12. // @grant         GM_xmlhttpRequest
  13. // @author        Rob Garrison
  14. // ==/UserScript==
  15. /* global GM_addStyle, GM_getValue, GM_setValue, GM_xmlhttpRequest */
  16. /*jshint unused:true */
  17. (function() {
  18.   "use strict";
  19.  
  20.   GM_addStyle([
  21.     "table.files tr.ghip-image-previews, table.files.ghip-show-previews tbody tr.js-navigation-item { display:none; }",
  22.     "table.files.ghip-show-previews tr.ghip-image-previews { display:table-row; }",
  23.     "table.files.ghip-show-previews .ghip-non-image { height:80px; margin-top:15px; opacity:.8; }",
  24.     "table.files.ghip-show-previews .image { position:relative; overflow:hidden; text-align:center; }",
  25.     ".ghip-image-previews .image { padding:10px; }",
  26.     "table.files.ghip-tiled .image { width:21.9%; }",
  27.     "table.files.ghip-tiled .image .border-wrap img, .ghip-image-previews .border-wrap svg { max-height:130px; }",
  28.     "table.files.ghip-fullw .image { width:97%; height:auto; }",
  29.     "table.files.ghip-tiled .image:hover img:not(.ghip-non-image) { zoom:3; }",
  30.     ".ghip-image-previews .border-wrap img, .ghip-image-previews .border-wrap svg { max-width:95%; }",
  31.     ".ghip-image-previews .border-wrap h4 { overflow:hidden; white-space:nowrap; text-overflow:ellipsis; margin-bottom:5px; }",
  32.     ".btn.ghip-tiled > *, .btn.ghip-fullw > *, .ghip-image-previews iframe { pointer-events:none; }",
  33.     ".image .ghip-file-type { font-size:18px; margin-top:10px; }",
  34.     // override GitHub-Dark styles
  35.     "table.files img[src*='octocat-spinner'], img[src='/images/spinner.gif'] { width:auto !important; height:auto !important; }"
  36.   ].join(""));
  37.  
  38.   var busy = false,
  39.  
  40.   // supported img types
  41.   imgExt = /(png|jpg|jpeg|gif|tif|tiff|bmp|webp)$/,
  42.   svgExt = /svg$/,
  43.  
  44.   tiled = [
  45.     "<svg class='octicon' xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'>",
  46.       "<path d='M0 0h7v7H0zM9 9h7v7H9zM9 0h7v7H9zM0 9h7v7H0z'/>",
  47.     "</svg>"
  48.   ].join(""),
  49.  
  50.   fullWidth = [
  51.     "<svg class='octicon' xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'>",
  52.       "<path d='M0 0h16v7H0zM0 9h16v7H0z'/>",
  53.     "</svg>"
  54.   ].join(""),
  55.  
  56.   imgTemplate = [
  57.     "<a href='${url}' class='exploregrid-item image js-navigation-open' rel='nofollow'>",
  58.       "<span class='border-wrap'>${image}</span>",
  59.     "</a>"
  60.   ].join(""),
  61.  
  62.   addToggles = function() {
  63.     if (document.querySelector(".gh-img-preview")) { return; }
  64.     busy = true;
  65.     var div = document.createElement("div"),
  66.       btn = " btn btn-sm tooltipped tooltipped-n' aria-label='Show ";
  67.     div.className = "btn-group right gh-img-preview";
  68.     div.innerHTML = [
  69.       "<div class='ghip-tiled" + btn + "tiled files with image preview'>" + tiled + "</div>",
  70.       "<div class='ghip-fullw" + btn + "full width files with image preview'>" + fullWidth + "</div>"
  71.     ].join("");
  72.     document.querySelector(".file-navigation").appendChild(div);
  73.  
  74.     div.querySelector(".ghip-tiled").addEventListener("click", function() {
  75.       openView("tiled");
  76.     });
  77.     div.querySelector(".ghip-fullw").addEventListener("click", function() {
  78.       openView("fullw");
  79.     });
  80.     busy = false;
  81.   },
  82.  
  83.   setInitState = function() {
  84.     var view = GM_getValue("gh-image-preview");
  85.     if (view) {
  86.       openView(view);
  87.     }
  88.   },
  89.  
  90.   openView = function(name) {
  91.     var el = document.querySelector(".ghip-" + name);
  92.     if (el) {
  93.       el.classList.toggle("selected");
  94.       if (el.classList.contains("selected")) {
  95.         GM_setValue("gh-image-preview", name);
  96.         showPreview(name);
  97.       } else {
  98.         GM_setValue("gh-image-preview", "");
  99.         showList();
  100.       }
  101.     }
  102.   },
  103.  
  104.   showPreview = function(size) {
  105.     buildPreviews();
  106.     var table = document.querySelector("table.files"),
  107.       btn1 = "ghip-" + size,
  108.       btn2 = "ghip-" + (size === "fullw" ? "tiled" : "fullw");
  109.     table.classList.add("ghip-show-previews");
  110.     table.classList.add(btn1);
  111.     document.querySelector(".btn." + btn1).classList.add("selected");
  112.     table.classList.remove(btn2);
  113.     document.querySelector(".btn." + btn2).classList.remove("selected");
  114.   },
  115.  
  116.   showList = function() {
  117.     var table = document.querySelector("table.files");
  118.     table.classList.remove("ghip-show-previews");
  119.     table.classList.remove("ghip-tiled");
  120.     table.classList.remove("ghip-fullw");
  121.     document.querySelector(".btn.ghip-tiled").classList.remove("selected");
  122.     document.querySelector(".btn.ghip-fullw").classList.remove("selected");
  123.   },
  124.  
  125.   buildPreviews = function() {
  126.     busy = true;
  127.     var template, url, temp, ext,
  128.       indx = 0,
  129.       row = document.createElement("tr"),
  130.       imgs = "<td colspan='4' class='ghip-content'>",
  131.       table = document.querySelector("table.files tbody:last-child"),
  132.       files = document.querySelectorAll("tr.js-navigation-item"),
  133.       len = files.length;
  134.     row.className = "ghip-image-previews";
  135.     if (document.querySelector(".ghip-image-previews")) {
  136.       temp = document.querySelector(".ghip-image-previews");
  137.       temp.parentNode.removeChild(temp);
  138.     }
  139.     if (table) {
  140.       for (indx = 0; indx < len; indx++) {
  141.         temp = files[indx].querySelector("td.content a");
  142.         template = temp ? "<h4>" + temp.textContent.trim() + "</h4>" : "";
  143.         url = temp ? temp.href : "";
  144.         if (imgExt.test(url)) {
  145.           // *** image preview ***
  146.           template += "<img src='" + url + "?raw=true'/>";
  147.           imgs += imgTemplate.replace("${url}", url).replace("${image}", template);
  148.         } else if (svgExt.test(url)) {
  149.           // *** svg preview ***
  150.           // loaded & encoded because GitHub sets content-type headers as a string
  151.           temp = url.substring(url.lastIndexOf("/") + 1, url.length);
  152.           template += "<img data-svg-holder='" + temp + "' alt='" + temp + "' />";
  153.           imgs += updateTemplate(url, template);
  154.           getSVG(url + "?raw=true");
  155.         } else {
  156.           // *** non-images (file/folder icons) ***
  157.           temp = files[indx].querySelector("td.icon svg");
  158.           if (temp) {
  159.             ext = temp.classList.contains("octicon-file-directory");
  160.             // add xmlns otherwise the svg won't work inside an img
  161.             // GitHub doesn't include this attribute on any svg octicons
  162.             temp = temp.outerHTML.replace("<svg", "<svg xmlns='http://www.w3.org/2000/svg'");
  163.             // include "leaflet-tile-container" to invert icon for GitHub-Dark
  164.             template += "<span class='leaflet-tile-container'>" +
  165.               "<img class='ghip-non-image' src='data:image/svg+xml;base64," + window.btoa(temp) + "'/>" +
  166.               "</span>" +
  167.               (ext ? "" : "<h4 class='ghip-file-type'>" +
  168.                 url.substring(url.lastIndexOf(".") + 1, url.length).toUpperCase() + "</h4>");
  169.             imgs += updateTemplate(url, template);
  170.           } else if (files[indx].classList.contains("up-tree")) {
  171.             // Up tree link
  172.             temp = files[indx].querySelector("td:nth-child(2) a");
  173.             url = temp ? temp.href : "";
  174.             if (url) {
  175.               imgs += updateTemplate(url, "<h4>&middot;&middot</h4>");
  176.             }
  177.           }
  178.         }
  179.       }
  180.       row.innerHTML = imgs + "</td>";
  181.       table.appendChild(row);
  182.     }
  183.     busy = false;
  184.   },
  185.  
  186.   updateTemplate = function(url, img) {
  187.     return imgTemplate
  188.       .replace("${url}", url)
  189.       .replace("${image}", img);
  190.   },
  191.  
  192.   getSVG = function(url) {
  193.     GM_xmlhttpRequest({
  194.       method: "GET",
  195.       url: url,
  196.       onload : function(response) {
  197.         busy = true;
  198.         var encoded,
  199.           url = response.finalUrl,
  200.           file = url.substring(url.lastIndexOf("/") + 1, url.length),
  201.           target = document.querySelector("[data-svg-holder='" + file+ "']");
  202.         if (target) {
  203.           encoded = window.btoa(response.responseText);
  204.           target.src = "data:image/svg+xml;base64," + encoded;
  205.         }
  206.         busy = false;
  207.       }
  208.     });
  209.   },
  210.  
  211.   init = function() {
  212.     if (document.querySelector("table.files")) {
  213.       addToggles();
  214.       setInitState();
  215.     }
  216.   },
  217.  
  218.   // timer needed for file list to update?
  219.   timer,
  220.  
  221.   // DOM targets - to detect GitHub dynamic ajax page loading
  222.   targets = document.querySelectorAll([
  223.     "#js-repo-pjax-container",
  224.     ".context-loader-container",
  225.     "[data-pjax-container]"
  226.   ].join(","));
  227.  
  228.   Array.prototype.forEach.call(targets, function(target) {
  229.     new MutationObserver(function(mutations) {
  230.       mutations.forEach(function(mutation) {
  231.         // preform checks before adding code wrap to minimize function calls
  232.         if (!busy && mutation.target === target) {
  233.           clearTimeout(timer);
  234.           timer = setTimeout(init, 200);
  235.         }
  236.       });
  237.     }).observe(target, {
  238.       childList: true,
  239.       subtree: true
  240.     });
  241.   });
  242.  
  243.   init();
  244.  
  245. })();