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GitHub Image Preview

A userscript that adds clickable image thumbnails

当前为 2016-05-19 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name          GitHub Image Preview
  3. // @version       1.0.4
  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. // @connect       github.com
  14. // @connect       githubusercontent.com
  15. // @author        Rob Garrison
  16. // ==/UserScript==
  17. /* global GM_addStyle, GM_getValue, GM_setValue, GM_xmlhttpRequest */
  18. /*jshint unused:true */
  19. (function() {
  20.   "use strict";
  21.  
  22.   GM_addStyle([
  23.     "table.files tr.ghip-image-previews, table.files.ghip-show-previews tbody tr.js-navigation-item { display:none; }",
  24.     "table.files.ghip-show-previews tr.ghip-image-previews { display:table-row; }",
  25.     "table.files.ghip-show-previews .ghip-non-image { height:80px; margin-top:15px; opacity:.8; }",
  26.     "table.files.ghip-show-previews .image { position:relative; overflow:hidden; text-align:center; }",
  27.     ".ghip-image-previews .image { padding:10px; }",
  28.     "table.files.ghip-tiled .image { width:21.9%; }",
  29.     "table.files.ghip-tiled .image .border-wrap img, .ghip-image-previews .border-wrap svg { max-height:130px; }",
  30.     "table.files.ghip-fullw .image { width:97%; height:auto; }",
  31.     "table.files.ghip-tiled .image:hover img:not(.ghip-non-image) { zoom:3; }",
  32.     ".ghip-image-previews .border-wrap img, .ghip-image-previews .border-wrap svg { max-width:95%; }",
  33.     ".ghip-image-previews .border-wrap h4 { overflow:hidden; white-space:nowrap; text-overflow:ellipsis; margin-bottom:5px; }",
  34.     ".btn.ghip-tiled > *, .btn.ghip-fullw > *, .ghip-image-previews iframe { pointer-events:none; }",
  35.     ".image .ghip-file-type { font-size:18px; margin-top:10px; }",
  36.     // override GitHub-Dark styles
  37.     "table.files img[src*='octocat-spinner'], img[src='/images/spinner.gif'] { width:auto !important; height:auto !important; }"
  38.   ].join(""));
  39.  
  40.   var busy = false,
  41.  
  42.   // supported img types
  43.   imgExt = /(png|jpg|jpeg|gif|tif|tiff|bmp|webp)$/,
  44.   svgExt = /svg$/,
  45.  
  46.   tiled = [
  47.     "<svg class='octicon' xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'>",
  48.       "<path d='M0 0h7v7H0zM9 9h7v7H9zM9 0h7v7H9zM0 9h7v7H0z'/>",
  49.     "</svg>"
  50.   ].join(""),
  51.  
  52.   fullWidth = [
  53.     "<svg class='octicon' xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'>",
  54.       "<path d='M0 0h16v7H0zM0 9h16v7H0z'/>",
  55.     "</svg>"
  56.   ].join(""),
  57.  
  58.   imgTemplate = [
  59.     "<a href='${url}' class='exploregrid-item image js-navigation-open' rel='nofollow'>",
  60.       "<span class='border-wrap'>${image}</span>",
  61.     "</a>"
  62.   ].join(""),
  63.  
  64.   addToggles = function() {
  65.     if (document.querySelector(".gh-img-preview")) { return; }
  66.     busy = true;
  67.     var div = document.createElement("div"),
  68.       btn = " btn btn-sm tooltipped tooltipped-n' aria-label='Show ";
  69.     div.className = "btn-group right gh-img-preview";
  70.     div.innerHTML = [
  71.       "<div class='ghip-tiled" + btn + "tiled files with image preview'>" + tiled + "</div>",
  72.       "<div class='ghip-fullw" + btn + "full width files with image preview'>" + fullWidth + "</div>"
  73.     ].join("");
  74.     document.querySelector(".file-navigation").appendChild(div);
  75.  
  76.     div.querySelector(".ghip-tiled").addEventListener("click", function() {
  77.       openView("tiled");
  78.     });
  79.     div.querySelector(".ghip-fullw").addEventListener("click", function() {
  80.       openView("fullw");
  81.     });
  82.     busy = false;
  83.   },
  84.  
  85.   setInitState = function() {
  86.     var view = GM_getValue("gh-image-preview");
  87.     if (view) {
  88.       openView(view);
  89.     }
  90.   },
  91.  
  92.   openView = function(name) {
  93.     var el = document.querySelector(".ghip-" + name);
  94.     if (el) {
  95.       el.classList.toggle("selected");
  96.       if (el.classList.contains("selected")) {
  97.         GM_setValue("gh-image-preview", name);
  98.         showPreview(name);
  99.       } else {
  100.         GM_setValue("gh-image-preview", "");
  101.         showList();
  102.       }
  103.     }
  104.   },
  105.  
  106.   showPreview = function(size) {
  107.     buildPreviews();
  108.     var table = document.querySelector("table.files"),
  109.       btn1 = "ghip-" + size,
  110.       btn2 = "ghip-" + (size === "fullw" ? "tiled" : "fullw");
  111.     table.classList.add("ghip-show-previews");
  112.     table.classList.add(btn1);
  113.     document.querySelector(".btn." + btn1).classList.add("selected");
  114.     table.classList.remove(btn2);
  115.     document.querySelector(".btn." + btn2).classList.remove("selected");
  116.   },
  117.  
  118.   showList = function() {
  119.     var table = document.querySelector("table.files");
  120.     table.classList.remove("ghip-show-previews");
  121.     table.classList.remove("ghip-tiled");
  122.     table.classList.remove("ghip-fullw");
  123.     document.querySelector(".btn.ghip-tiled").classList.remove("selected");
  124.     document.querySelector(".btn.ghip-fullw").classList.remove("selected");
  125.   },
  126.  
  127.   buildPreviews = function() {
  128.     busy = true;
  129.     var template, url, temp, noExt,
  130.       indx = 0,
  131.       row = document.createElement("tr"),
  132.       imgs = "<td colspan='4' class='ghip-content'>",
  133.       table = document.querySelector("table.files tbody:last-child"),
  134.       files = document.querySelectorAll("tr.js-navigation-item"),
  135.       len = files.length;
  136.     row.className = "ghip-image-previews";
  137.     if (document.querySelector(".ghip-image-previews")) {
  138.       temp = document.querySelector(".ghip-image-previews");
  139.       temp.parentNode.removeChild(temp);
  140.     }
  141.     if (table) {
  142.       for (indx = 0; indx < len; indx++) {
  143.         temp = files[indx].querySelector("td.content a");
  144.         template = temp ? "<h4>" + temp.textContent.trim() + "</h4>" : "";
  145.         url = temp ? temp.href : "";
  146.         if (imgExt.test(url)) {
  147.           // *** image preview ***
  148.           template += "<img src='" + url + "?raw=true'/>";
  149.           imgs += imgTemplate.replace("${url}", url).replace("${image}", template);
  150.         } else if (svgExt.test(url)) {
  151.           // *** svg preview ***
  152.           // loaded & encoded because GitHub sets content-type headers as a string
  153.           temp = url.substring(url.lastIndexOf("/") + 1, url.length);
  154.           template += "<img data-svg-holder='" + temp + "' alt='" + temp + "' />";
  155.           imgs += updateTemplate(url, template);
  156.           getSVG(url + "?raw=true");
  157.         } else {
  158.           // *** non-images (file/folder icons) ***
  159.           temp = files[indx].querySelector("td.icon svg");
  160.           if (temp) {
  161.             noExt = temp.classList.contains("octicon-file-directory");
  162.             // add xmlns otherwise the svg won't work inside an img
  163.             // GitHub doesn't include this attribute on any svg octicons
  164.             temp = temp.outerHTML.replace("<svg", "<svg xmlns='http://www.w3.org/2000/svg'");
  165.             // include "leaflet-tile-container" to invert icon for GitHub-Dark
  166.             template += "<span class='leaflet-tile-container'>" +
  167.               "<img class='ghip-non-image' src='data:image/svg+xml;base64," + window.btoa(temp) + "'/>" +
  168.               "</span>";
  169.             // get file name + extension
  170.             temp = url.substring(url.lastIndexOf("/") + 1, url.length);
  171.             // don't include extension for folders, or files with no extension, or
  172.             // files starting with a "." (e.g. ".gitignore")
  173.             if (!noExt && temp.indexOf(".") > 0) {
  174.               template += "<h4 class='ghip-file-type'>" +
  175.                 temp.substring(temp.lastIndexOf(".") + 1, temp.length).toUpperCase() + "</h4>";
  176.             }
  177.             imgs += updateTemplate(url, template);
  178.           } else if (files[indx].classList.contains("up-tree")) {
  179.             // Up tree link
  180.             temp = files[indx].querySelector("td:nth-child(2) a");
  181.             url = temp ? temp.href : "";
  182.             if (url) {
  183.               imgs += updateTemplate(url, "<h4>&middot;&middot</h4>");
  184.             }
  185.           }
  186.         }
  187.       }
  188.       row.innerHTML = imgs + "</td>";
  189.       table.appendChild(row);
  190.     }
  191.     busy = false;
  192.   },
  193.  
  194.   updateTemplate = function(url, img) {
  195.     return imgTemplate
  196.       .replace("${url}", url)
  197.       .replace("${image}", img);
  198.   },
  199.  
  200.   getSVG = function(url) {
  201.     GM_xmlhttpRequest({
  202.       method: "GET",
  203.       url: url,
  204.       onload : function(response) {
  205.         busy = true;
  206.         var encoded,
  207.           url = response.finalUrl,
  208.           file = url.substring(url.lastIndexOf("/") + 1, url.length),
  209.           target = document.querySelector("[data-svg-holder='" + file+ "']");
  210.         if (target) {
  211.           encoded = window.btoa(response.responseText);
  212.           target.src = "data:image/svg+xml;base64," + encoded;
  213.         }
  214.         busy = false;
  215.       }
  216.     });
  217.   },
  218.  
  219.   init = function() {
  220.     if (document.querySelector("table.files")) {
  221.       addToggles();
  222.       setInitState();
  223.     }
  224.   },
  225.  
  226.   // timer needed for file list to update?
  227.   timer,
  228.  
  229.   // DOM targets - to detect GitHub dynamic ajax page loading
  230.   targets = document.querySelectorAll([
  231.     "#js-repo-pjax-container",
  232.     ".context-loader-container",
  233.     "[data-pjax-container]"
  234.   ].join(","));
  235.  
  236.   Array.prototype.forEach.call(targets, function(target) {
  237.     new MutationObserver(function(mutations) {
  238.       mutations.forEach(function(mutation) {
  239.         // preform checks before adding code wrap to minimize function calls
  240.         if (!busy && mutation.target === target) {
  241.           clearTimeout(timer);
  242.           timer = setTimeout(init, 200);
  243.         }
  244.       });
  245.     }).observe(target, {
  246.       childList: true,
  247.       subtree: true
  248.     });
  249.   });
  250.  
  251.   init();
  252.  
  253. })();