A userscript that adds clickable image thumbnails
当前为
// ==UserScript==
// @name GitHub Image Preview
// @version 1.2.1
// @description A userscript that adds clickable image thumbnails
// @license MIT
// @author Rob Garrison
// @namespace https://github.com/Mottie
// @include https://github.com/*
// @run-at document-idle
// @grant GM_addStyle
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_xmlhttpRequest
// @connect github.com
// @connect githubusercontent.com
// @require https://greatest.deepsurf.us/scripts/28721-mutations/code/mutations.js?version=666427
// @icon https://assets-cdn.github.com/pinned-octocat.svg
// ==/UserScript==
(() => {
"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:15px; opacity:.2; }
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:22.5%; height:180px;
margin:12px !important; /* GitHub uses !important flags now :( */ }
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; }
/* zoom doesn't work in Firefox, but "-moz-transform:scale(3);"
doesn't limit the size of the image, so it overflows */
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 img.error { border:5px solid red;
border-radius:32px; }
.ghip-image-previews .border-wrap h4 { white-space:nowrap;
text-overflow:ellipsis; margin-bottom:5px; }
.ghip-image-previews .border-wrap h4.ghip-file-name { overflow:hidden; }
.btn.ghip-tiled > *, .btn.ghip-fullw > *, .ghip-image-previews iframe {
pointer-events:none; vertical-align:baseline; }
.image .ghip-file-type { font-size:30px; top:-1.8em; position:relative;
z-index:2; }
.ghip-content span.exploregrid-item .ghip-file-name { cursor:default; }
/* override GitHub-Dark styles */
table.files img[src*='octocat-spinner'], img[src='/images/spinner.gif'] {
width:auto !important; height:auto !important; }
table.files td .simplified-path { color:#888 !important; }
`);
// supported img types
const imgExt = /(png|jpg|jpeg|gif|tif|tiff|bmp|webp)$/i,
svgExt = /svg$/i,
spinner = "https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif",
folderIconClasses = `
.octicon-file-directory,
.octicon-file-symlink-directory,
.octicon-file-submodule`,
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>
`,
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>
`,
imgTemplate = [
// not using backticks here
"<a href='${url}' class='exploregrid-item image m-3 float-left js-navigation-open' rel='nofollow'>",
"<span class='border-wrap'>${image}</span>",
"</a>"
].join(""),
spanTemplate = [
"<span class='exploregrid-item image m-3 float-left'>",
"<span class='border-wrap'>${image}</span>",
"</span>"
].join("");
function addToggles() {
if ($(".gh-img-preview")) {
return;
}
const div = document.createElement("div"),
btn = `btn btn-sm BtnGroup-item tooltipped tooltipped-n" aria-label="Show`;
div.className = "BtnGroup float-right gh-img-preview";
div.innerHTML = `
<button type="button" class="ghip-tiled ${btn} tiled files with image preview">${tiled}</button>
<button type="button" class="ghip-fullw ${btn} full width files with image preview">${fullWidth}</button>
`;
$(".file-navigation").appendChild(div);
$(".ghip-tiled", div).addEventListener("click", event => {
openView("tiled", event);
});
$(".ghip-fullw", div).addEventListener("click", event => {
openView("fullw", event);
});
}
function setInitState() {
const state = GM_getValue("gh-image-preview");
if (state) {
openView(state);
}
}
function openView(name, event) {
const el = $(".ghip-" + name);
if (el) {
if (event) {
el.classList.toggle("selected");
if (!el.classList.contains("selected")) {
return showList();
}
}
showPreview(name);
}
}
function showPreview(name) {
buildPreviews();
const table = $("table.files"),
selected = "ghip-" + name,
notSelected = "ghip-" + (name === "fullw" ? "tiled" : "fullw");
table.classList.add("ghip-show-previews", selected);
$(".btn." + selected).classList.add("selected");
table.classList.remove(notSelected);
$(".btn." + notSelected).classList.remove("selected");
GM_setValue("gh-image-preview", name);
}
function showList() {
$("table.files").classList.remove(
"ghip-show-previews", "ghip-tiled", "ghip-fullw"
);
$(".btn.ghip-tiled").classList.remove("selected");
$(".btn.ghip-fullw").classList.remove("selected");
GM_setValue("gh-image-preview", "");
}
function buildPreviews() {
let template, url, temp, noExt, fileName,
imgs = "<td colspan='4' class='ghip-content'>",
indx = 0;
const row = document.createElement("tr"),
table = $("table.files tbody:last-child"),
files = $$("tr.js-navigation-item"),
len = files.length;
row.className = "ghip-image-previews";
if ($(".ghip-image-previews")) {
temp = $(".ghip-image-previews");
temp.parentNode.removeChild(temp);
}
if (table) {
for (indx = 0; indx < len; indx++) {
// not every submodule includes a link; reference examples from
// see https://github.com/electron/electron/tree/v1.1.1/vendor
temp = $("td.content a", files[indx]) ||
$("td.content span span", files[indx]);
// use innerHTML because some links include path - see "third_party/lss"
fileName = temp ? temp.innerHTML.trim() : "";
// temp = temp && $("a", temp);
url = temp && temp.nodeName === "A" ? temp.href : "";
// add link color
template = `<h4 class="ghip-file-name ${
(url ? " text-blue" : "")}" title="${fileName}">
${fileName}
</h4>`;
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}" data-svg-url="${url}" alt="${temp}" src="${spinner}" />`;
imgs += updateTemplate(url, template);
} else {
// *** non-images (file/folder icons) ***
temp = $("td.icon svg", files[indx]);
if (temp) {
// non-files svg class: "directory", "submodule" or "symlink"
// add "ghip-folder" class for file-filters userscript
noExt = temp.matches(folderIconClasses) ? " ghip-folder" : "";
// 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${noExt}">` +
`<img class="ghip-non-image" src="data:image/svg+xml;base64,` +
window.btoa(temp) + `"/></span>`;
// get file name + extension
temp = url.substring(url.lastIndexOf("/") + 1, url.length);
// don't include extension for folders, or files with no extension,
// or files starting with a "." (e.g. ".gitignore")
template += (!noExt && temp.indexOf(".") > 0) ?
"<h4 class='ghip-file-type'>" +
temp
.substring(temp.lastIndexOf(".") + 1, temp.length)
.toUpperCase() +
"</h4>" : "";
imgs += url ?
updateTemplate(url, template) :
// empty url; use non-link template
// see "depot_tools @ 4fa73b8" at
// https://github.com/electron/electron/tree/v1.1.1/vendor
updateTemplate(url, template, spanTemplate);
} else if (files[indx].classList.contains("up-tree")) {
// Up tree link
temp = $("td:nth-child(2) a", files[indx]);
url = temp ? temp.href : "";
imgs += url ?
updateTemplate(
url,
"<h4 class='text-blue ghip-up-tree'>··</h4>"
) : "";
}
}
}
row.innerHTML = imgs + "</td>";
table.appendChild(row);
lazyLoadSVGs();
}
}
function updateTemplate(url, img, tmpl) {
return (tmpl || imgTemplate)
.replace("${url}", url)
.replace("${image}", img);
}
function lazyLoadSVGs() {
const imgs = $$("[data-svg-holder]");
if (imgs.length && "IntersectionObserver" in window) {
let imgObserver = new IntersectionObserver(entries => {
entries.forEach(entry => {
if (entry.isIntersecting) {
const img = entry.target;
setTimeout(() => {
const bounds = img.getBoundingClientRect();
// Don't load all svgs when the user scrolls down the page really
// fast
if (bounds.top <= window.innerHeight && bounds.bottom >= 0) {
getSVG(imgObserver, img);
}
}, 300);
}
});
});
imgs.forEach(function(img) {
imgObserver.observe(img);
});
} else {
console.error("IntersectionObserver is not supported");
}
}
function getSVG(observer, img) {
GM_xmlhttpRequest({
method: "GET",
url: img.dataset.svgUrl + "?raw=true",
onload: response => {
const url = response.finalUrl,
file = url.substring(url.lastIndexOf("/") + 1, url.length),
target = $("[data-svg-holder='" + file + "']"),
resp = response.responseText,
// Loading too many images at once makes GitHub returns a "You have triggered
// an abuse detection mechanism" message
abuse = resp.includes("abuse detection");
if (target && !abuse) {
const encoded = window.btoa(response.responseText);
target.src = "data:image/svg+xml;base64," + encoded;
target.title = "";
target.classList.remove("error");
observer.unobserve(img);
} else if (abuse) {
img.title = "GitHub is reporting that too many images have been loaded at once, please wait";
img.classList.add("error");
}
}
});
}
function $(selector, el) {
return (el || document).querySelector(selector);
}
function $$(selector, el) {
return [...(el || document).querySelectorAll(selector)];
}
function init() {
if ($("table.files")) {
addToggles();
setTimeout(setInitState, 0);
}
}
document.addEventListener("ghmo:container", init);
init();
})();