A userscript that adds clickable image thumbnails
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// ==UserScript==
// @name GitHub Image Preview
// @version 1.0.1
// @description A userscript that adds clickable image thumbnails
// @license https://creativecommons.org/licenses/by-sa/4.0/
// @namespace http://github.com/Mottie
// @include https://github.com/*
// @run-at document-idle
// @grant GM_addStyle
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_xmlhttpRequest
// @author Rob Garrison
// ==/UserScript==
/* global GM_addStyle, GM_getValue, GM_setValue, GM_xmlhttpRequest */
/*jshint unused:true */
(function() {
"use strict";
GM_addStyle([
"table.files tr.ghip-image-previews, table.files.ghip-show-previews tbody tr.js-navigation-item { display:none; }",
"table.files.ghip-show-previews tr.ghip-image-previews { display:table-row; }",
"table.files.ghip-show-previews .ghip-non-image { height:80px; margin-top:20px; opacity:.8; }",
"table.files.ghip-show-previews .image { position:relative; overflow:hidden; text-align:center; }",
".ghip-image-previews .image { padding:10px; }",
"table.files.ghip-tiled .image { width:21.9%; }",
"table.files.ghip-tiled .image .border-wrap img, .ghip-image-previews .border-wrap svg { max-height:130px; }",
"table.files.ghip-fullw .image { width:97%; height:auto; }",
"table.files.ghip-tiled .image:hover img:not(.ghip-non-image) { zoom:3; }",
".ghip-image-previews .border-wrap img, .ghip-image-previews .border-wrap svg { max-width:95%; }",
".ghip-image-previews .border-wrap h4 { overflow:hidden; white-space:nowrap; text-overflow:ellipsis; margin-bottom:5px; }",
".btn.ghip-tiled > *, .btn.ghip-fullw > *, .ghip-image-previews iframe { pointer-events:none; }",
// override GitHub-Dark styles
"table.files img[src*='octocat-spinner'], img[src='/images/spinner.gif'] { width:auto !important; height:auto !important; }"
].join(""));
var busy = false,
// supported img types
imgExt = /(png|jpg|jpeg|gif|tif|tiff|bmp|webp)$/,
svgExt = /svg$/,
tiled = [
"<svg class='octicon' xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'>",
"<path d='M0 0h7v7H0zM9 9h7v7H9zM9 0h7v7H9zM0 9h7v7H0z'/>",
"</svg>"
].join(""),
fullWidth = [
"<svg class='octicon' xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'>",
"<path d='M0 0h16v7H0zM0 9h16v7H0z'/>",
"</svg>"
].join(""),
imgTemplate = [
"<a href='${url}' class='exploregrid-item image js-navigation-open' rel='nofollow'>",
"<span class='border-wrap'>${image}</span>",
"</a>"
].join(""),
addToggles = function() {
if (document.querySelector(".gh-img-preview")) { return; }
busy = true;
var div = document.createElement("div"),
btn = " btn btn-sm tooltipped tooltipped-n' aria-label='Show ";
div.className = "btn-group right gh-img-preview";
div.innerHTML = [
"<div class='ghip-tiled" + btn + "tiled files with image preview'>" + tiled + "</div>",
"<div class='ghip-fullw" + btn + "full width files with image preview'>" + fullWidth + "</div>"
].join("");
document.querySelector(".file-navigation").appendChild(div);
div.querySelector(".ghip-tiled").addEventListener("click", function() {
openView("tiled");
});
div.querySelector(".ghip-fullw").addEventListener("click", function() {
openView("fullw");
});
busy = false;
},
setInitState = function() {
var view = GM_getValue("gh-image-preview");
if (view) {
openView(view);
}
},
openView = function(name) {
var el = document.querySelector(".ghip-" + name);
if (el) {
el.classList.toggle("selected");
if (el.classList.contains("selected")) {
GM_setValue("gh-image-preview", name);
showPreview(name);
} else {
GM_setValue("gh-image-preview", "");
showList();
}
}
},
showPreview = function(size) {
buildPreviews();
var table = document.querySelector("table.files"),
btn1 = "ghip-" + size,
btn2 = "ghip-" + (size === "fullw" ? "tiled" : "fullw");
table.classList.add("ghip-show-previews");
table.classList.add(btn1);
document.querySelector(".btn." + btn1).classList.add("selected");
table.classList.remove(btn2);
document.querySelector(".btn." + btn2).classList.remove("selected");
},
showList = function() {
var table = document.querySelector("table.files");
table.classList.remove("ghip-show-previews");
table.classList.remove("ghip-tiled");
table.classList.remove("ghip-fullw");
document.querySelector(".btn.ghip-tiled").classList.remove("selected");
document.querySelector(".btn.ghip-fullw").classList.remove("selected");
},
buildPreviews = function() {
busy = true;
var template, url, temp,
indx = 0,
row = document.createElement("tr"),
imgs = "<td colspan='4' class='ghip-content'>",
table = document.querySelector("table.files tbody:last-child"),
files = document.querySelectorAll("tr.js-navigation-item"),
len = files.length;
row.className = "ghip-image-previews";
if (document.querySelector(".ghip-image-previews")) {
temp = document.querySelector(".ghip-image-previews");
temp.parentNode.removeChild(temp);
}
if (table) {
for (indx = 0; indx < len; indx++) {
temp = files[indx].querySelector("td.content a");
template = temp ? "<h4>" + temp.textContent.trim() + "</h4>" : "";
url = temp ? temp.href : "";
if (imgExt.test(url)) {
// *** image preview ***
template += "<img src='" + url + "?raw=true'/>";
imgs += imgTemplate.replace("${url}", url).replace("${image}", template);
} else if (svgExt.test(url)) {
// *** svg preview ***
// loaded & encoded because GitHub sets content-type headers as a string
temp = url.substring(url.lastIndexOf("/") + 1, url.length);
template += "<img data-svg-holder='" + temp + "' alt='" + temp + "' />";
imgs += updateTemplate(url, template);
getSVG(url + "?raw=true");
} else {
// *** non-images (file/folder icons) ***
temp = files[indx].querySelector("td.icon svg");
if (temp) {
// add xmlns otherwise the svg won't work inside an img
// GitHub doesn't include this attribute on any svg octicons
temp = temp.outerHTML.replace("<svg", "<svg xmlns='http://www.w3.org/2000/svg'");
// include "leaflet-tile-container" to invert icon for GitHub-Dark
template += "<span class='leaflet-tile-container'>" +
"<img class='ghip-non-image' src='data:image/svg+xml;base64," + window.btoa(temp) + "'/>" +
"</span>";
imgs += updateTemplate(url, template);
} else if (files[indx].classList.contains("up-tree")) {
// Up tree link
temp = files[indx].querySelector("td:nth-child(2) a");
url = temp ? temp.href : "";
if (url) {
imgs += updateTemplate(url, "<h4>··</h4>");
}
}
}
}
row.innerHTML = imgs + "</td>";
table.appendChild(row);
}
busy = false;
},
updateTemplate = function(url, img) {
return imgTemplate
.replace("${url}", url)
.replace("${image}", img);
},
getSVG = function(url) {
GM_xmlhttpRequest({
method: "GET",
url: url,
onload : function(response) {
busy = true;
var encoded,
url = response.finalUrl,
file = url.substring(url.lastIndexOf("/") + 1, url.length),
target = document.querySelector("[data-svg-holder='" + file+ "']");
if (target) {
encoded = window.btoa(response.responseText);
target.src = "data:image/svg+xml;base64," + encoded;
}
busy = false;
}
});
},
init = function() {
if (document.querySelector("table.files")) {
addToggles();
setInitState();
}
},
// timer needed for file list to update?
timer,
// DOM targets - to detect GitHub dynamic ajax page loading
targets = document.querySelectorAll([
"#js-repo-pjax-container",
".context-loader-container",
"[data-pjax-container]"
].join(","));
Array.prototype.forEach.call(targets, function(target) {
new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
// preform checks before adding code wrap to minimize function calls
if (!busy && mutation.target === target) {
clearTimeout(timer);
timer = setTimeout(init, 200);
}
});
}).observe(target, {
childList: true,
subtree: true
});
});
init();
})();