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GitHub Image Preview

A userscript that adds clickable image thumbnails

当前为 2016-05-22 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name          GitHub Image Preview
  3. // @version       1.0.5
  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:.2; }",
  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.     // zoom doesn't work in Firefox, but `-moz-transform:scale(3);` doesn't limit the size of the image, so it overflows
  32.     "table.files.ghip-tiled .image:hover img:not(.ghip-non-image) { zoom:3; }",
  33.     ".ghip-image-previews .border-wrap img, .ghip-image-previews .border-wrap svg { max-width:95%; }",
  34.     ".ghip-image-previews .border-wrap h4 { overflow:hidden; white-space:nowrap; text-overflow:ellipsis; margin-bottom:5px; }",
  35.     ".btn.ghip-tiled > *, .btn.ghip-fullw > *, .ghip-image-previews iframe { pointer-events:none; }",
  36.     ".image .ghip-file-type { font-size:30px; top:-65px; position:relative; z-index:2; }",
  37.     // override GitHub-Dark styles
  38.     "table.files img[src*='octocat-spinner'], img[src='/images/spinner.gif'] { width:auto !important; height:auto !important; }"
  39.   ].join(""));
  40.  
  41.   var busy = false,
  42.  
  43.   // supported img types
  44.   imgExt = /(png|jpg|jpeg|gif|tif|tiff|bmp|webp)$/,
  45.   svgExt = /svg$/,
  46.  
  47.   tiled = [
  48.     "<svg class='octicon' xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'>",
  49.       "<path d='M0 0h7v7H0zM9 9h7v7H9zM9 0h7v7H9zM0 9h7v7H0z'/>",
  50.     "</svg>"
  51.   ].join(""),
  52.  
  53.   fullWidth = [
  54.     "<svg class='octicon' xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'>",
  55.       "<path d='M0 0h16v7H0zM0 9h16v7H0z'/>",
  56.     "</svg>"
  57.   ].join(""),
  58.  
  59.   imgTemplate = [
  60.     "<a href='${url}' class='exploregrid-item image js-navigation-open' rel='nofollow'>",
  61.       "<span class='border-wrap'>${image}</span>",
  62.     "</a>"
  63.   ].join(""),
  64.  
  65.   addToggles = function() {
  66.     if (document.querySelector(".gh-img-preview")) { return; }
  67.     busy = true;
  68.     var div = document.createElement("div"),
  69.       btn = " btn btn-sm tooltipped tooltipped-n' aria-label='Show ";
  70.     div.className = "btn-group right gh-img-preview";
  71.     div.innerHTML = [
  72.       "<div class='ghip-tiled" + btn + "tiled files with image preview'>" + tiled + "</div>",
  73.       "<div class='ghip-fullw" + btn + "full width files with image preview'>" + fullWidth + "</div>"
  74.     ].join("");
  75.     document.querySelector(".file-navigation").appendChild(div);
  76.  
  77.     div.querySelector(".ghip-tiled").addEventListener("click", function() {
  78.       openView("tiled");
  79.     });
  80.     div.querySelector(".ghip-fullw").addEventListener("click", function() {
  81.       openView("fullw");
  82.     });
  83.     busy = false;
  84.   },
  85.  
  86.   setInitState = function() {
  87.     var view = GM_getValue("gh-image-preview");
  88.     if (view) {
  89.       openView(view);
  90.     }
  91.   },
  92.  
  93.   openView = function(name) {
  94.     var el = document.querySelector(".ghip-" + name);
  95.     if (el) {
  96.       el.classList.toggle("selected");
  97.       if (el.classList.contains("selected")) {
  98.         GM_setValue("gh-image-preview", name);
  99.         showPreview(name);
  100.       } else {
  101.         GM_setValue("gh-image-preview", "");
  102.         showList();
  103.       }
  104.     }
  105.   },
  106.  
  107.   showPreview = function(size) {
  108.     buildPreviews();
  109.     var table = document.querySelector("table.files"),
  110.       btn1 = "ghip-" + size,
  111.       btn2 = "ghip-" + (size === "fullw" ? "tiled" : "fullw");
  112.     table.classList.add("ghip-show-previews");
  113.     table.classList.add(btn1);
  114.     document.querySelector(".btn." + btn1).classList.add("selected");
  115.     table.classList.remove(btn2);
  116.     document.querySelector(".btn." + btn2).classList.remove("selected");
  117.   },
  118.  
  119.   showList = function() {
  120.     var table = document.querySelector("table.files");
  121.     table.classList.remove("ghip-show-previews");
  122.     table.classList.remove("ghip-tiled");
  123.     table.classList.remove("ghip-fullw");
  124.     document.querySelector(".btn.ghip-tiled").classList.remove("selected");
  125.     document.querySelector(".btn.ghip-fullw").classList.remove("selected");
  126.   },
  127.  
  128.   buildPreviews = function() {
  129.     busy = true;
  130.     var template, url, temp, noExt,
  131.       indx = 0,
  132.       row = document.createElement("tr"),
  133.       imgs = "<td colspan='4' class='ghip-content'>",
  134.       table = document.querySelector("table.files tbody:last-child"),
  135.       files = document.querySelectorAll("tr.js-navigation-item"),
  136.       len = files.length;
  137.     row.className = "ghip-image-previews";
  138.     if (document.querySelector(".ghip-image-previews")) {
  139.       temp = document.querySelector(".ghip-image-previews");
  140.       temp.parentNode.removeChild(temp);
  141.     }
  142.     if (table) {
  143.       for (indx = 0; indx < len; indx++) {
  144.         temp = files[indx].querySelector("td.content a");
  145.         template = temp ? "<h4>" + temp.textContent.trim() + "</h4>" : "";
  146.         url = temp ? temp.href : "";
  147.         if (imgExt.test(url)) {
  148.           // *** image preview ***
  149.           template += "<img src='" + url + "?raw=true'/>";
  150.           imgs += imgTemplate.replace("${url}", url).replace("${image}", template);
  151.         } else if (svgExt.test(url)) {
  152.           // *** svg preview ***
  153.           // loaded & encoded because GitHub sets content-type headers as a string
  154.           temp = url.substring(url.lastIndexOf("/") + 1, url.length);
  155.           template += "<img data-svg-holder='" + temp + "' alt='" + temp + "' />";
  156.           imgs += updateTemplate(url, template);
  157.           getSVG(url + "?raw=true");
  158.         } else {
  159.           // *** non-images (file/folder icons) ***
  160.           temp = files[indx].querySelector("td.icon svg");
  161.           if (temp) {
  162.             noExt = temp.classList.contains("octicon-file-directory");
  163.             // add xmlns otherwise the svg won't work inside an img
  164.             // GitHub doesn't include this attribute on any svg octicons
  165.             temp = temp.outerHTML.replace("<svg", "<svg xmlns='http://www.w3.org/2000/svg'");
  166.             // include "leaflet-tile-container" to invert icon for GitHub-Dark
  167.             template += "<span class='leaflet-tile-container'>" +
  168.               "<img class='ghip-non-image' src='data:image/svg+xml;base64," + window.btoa(temp) + "'/>" +
  169.               "</span>";
  170.             // get file name + extension
  171.             temp = url.substring(url.lastIndexOf("/") + 1, url.length);
  172.             // don't include extension for folders, or files with no extension, or
  173.             // files starting with a "." (e.g. ".gitignore")
  174.             if (!noExt && temp.indexOf(".") > 0) {
  175.               template += "<h4 class='ghip-file-type'>" +
  176.                 temp.substring(temp.lastIndexOf(".") + 1, temp.length).toUpperCase() + "</h4>";
  177.             }
  178.             imgs += updateTemplate(url, template);
  179.           } else if (files[indx].classList.contains("up-tree")) {
  180.             // Up tree link
  181.             temp = files[indx].querySelector("td:nth-child(2) a");
  182.             url = temp ? temp.href : "";
  183.             if (url) {
  184.               imgs += updateTemplate(url, "<h4>&middot;&middot</h4>");
  185.             }
  186.           }
  187.         }
  188.       }
  189.       row.innerHTML = imgs + "</td>";
  190.       table.appendChild(row);
  191.     }
  192.     busy = false;
  193.   },
  194.  
  195.   updateTemplate = function(url, img) {
  196.     return imgTemplate
  197.       .replace("${url}", url)
  198.       .replace("${image}", img);
  199.   },
  200.  
  201.   getSVG = function(url) {
  202.     GM_xmlhttpRequest({
  203.       method: "GET",
  204.       url: url,
  205.       onload : function(response) {
  206.         busy = true;
  207.         var encoded,
  208.           url = response.finalUrl,
  209.           file = url.substring(url.lastIndexOf("/") + 1, url.length),
  210.           target = document.querySelector("[data-svg-holder='" + file+ "']");
  211.         if (target) {
  212.           encoded = window.btoa(response.responseText);
  213.           target.src = "data:image/svg+xml;base64," + encoded;
  214.         }
  215.         busy = false;
  216.       }
  217.     });
  218.   },
  219.  
  220.   init = function() {
  221.     if (document.querySelector("table.files")) {
  222.       addToggles();
  223.       setInitState();
  224.     }
  225.   },
  226.  
  227.   // timer needed for file list to update?
  228.   timer,
  229.  
  230.   // DOM targets - to detect GitHub dynamic ajax page loading
  231.   targets = document.querySelectorAll([
  232.     "#js-repo-pjax-container",
  233.     ".context-loader-container",
  234.     "[data-pjax-container]"
  235.   ].join(","));
  236.  
  237.   Array.prototype.forEach.call(targets, function(target) {
  238.     new MutationObserver(function(mutations) {
  239.       mutations.forEach(function(mutation) {
  240.         // preform checks before adding code wrap to minimize function calls
  241.         if (!busy && mutation.target === target) {
  242.           clearTimeout(timer);
  243.           timer = setTimeout(init, 200);
  244.         }
  245.       });
  246.     }).observe(target, {
  247.       childList: true,
  248.       subtree: true
  249.     });
  250.   });
  251.  
  252.   init();
  253.  
  254. })();

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