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Improvements to Derpibooru's comment section
// ==UserScript==
// @name Derpibooru Comment Enhancements
// @description Improvements to Derpibooru's comment section
// @version 1.5.2
// @author Marker
// @license MIT
// @namespace https://github.com/marktaiwan/
// @homepageURL https://github.com/marktaiwan/Derpibooru-Link-Preview
// @supportURL https://github.com/marktaiwan/Derpibooru-Link-Preview/issues
// @match https://*.derpibooru.org/*
// @match https://*.trixiebooru.org/*
// @grant none
// @inject-into content
// @noframes
// @require https://openuserjs.org/src/libs/soufianesakhi/node-creation-observer.js
// @require https://openuserjs.org/src/libs/mark.taiwangmail.com/Derpibooru_Unified_Userscript_UI_Utility.js?v1.2.1
// ==/UserScript==
(function () {
'use strict';
// ==== User Config ====
const config = ConfigManager('Derpibooru Comment Enhancements', 'derpi_comment_enhancements');
config.registerSetting({
title: 'Linkify images',
key: 'link_images',
description: 'Link embedded images to their sources. Images already containing links will be unaffected.',
type: 'checkbox',
defaultValue: false
});
config.registerSetting({
title: 'Disable native preview',
key: 'disable_native_preview',
description: 'This will disable the site\'s native feature that inserts the linked comment above the current one when clicked, and instead navigates to the targted comment.',
type: 'checkbox',
defaultValue: false
});
const spoilerSettings = config.addFieldset('Reveal spoiler...');
spoilerSettings.registerSetting({
title: '...in comment preview',
key: 'show_preview_spoiler',
description: 'Reveal spoilers in the pop-up preview.',
type: 'checkbox',
defaultValue: true
});
spoilerSettings.registerSetting({
title: '...in comment highlight',
key: 'show_highlight_spoiler',
description: 'Reveal spoilers in the highlighted comment.',
type: 'checkbox',
defaultValue: true
});
const LINK_IMAGES = config.getEntry('link_images');
const DISABLE_NATIVE_PREVIEW = config.getEntry('disable_native_preview');
const SHOW_PREVIEW_SPOILER = config.getEntry('show_preview_spoiler');
const SHOW_HIGHLIGHT_SPOILER = config.getEntry('show_highlight_spoiler');
// ==== /User Config ====
const HOVER_ATTRIBUTE = 'comment-preview-active';
const fetchCache = {};
const backlinksCache = {};
function $(selector, parent = document) {
return parent.querySelector(selector);
}
function $$(selector, parent = document) {
return parent.querySelectorAll(selector);
}
/*
Unminified code from
https://derpibooru.org/meta/booru-on-rails-inquiry/post/3823503#post_3823503
*/
function timeAgo(args) {
const strings = {
seconds: 'less than a minute',
minute: 'about a minute',
minutes: '%d minutes',
hour: 'about an hour',
hours: 'about %d hours',
day: 'a day',
days: '%d days',
month: 'about a month',
months: '%d months',
year: 'about a year',
years: '%d years',
};
function distance(time) {
return new Date() - time;
}
function substitute(key, amount) {
return strings[key].replace('%d', Math.round(amount));
}
function setTimeAgo(el) {
const date = new Date(el.getAttribute('datetime'));
const distMillis = distance(date);
/* eslint-disable no-multi-spaces */
const seconds = Math.abs(distMillis) / 1000;
const minutes = seconds / 60;
const hours = minutes / 60;
const days = hours / 24;
const months = days / 30;
const years = days / 365;
const words =
seconds < 45 && substitute('seconds', seconds) ||
seconds < 90 && substitute('minute', 1) ||
minutes < 45 && substitute('minutes', minutes) ||
minutes < 90 && substitute('hour', 1) ||
hours < 24 && substitute('hours', hours) ||
hours < 42 && substitute('day', 1) ||
days < 30 && substitute('days', days) ||
days < 45 && substitute('month', 1) ||
days < 365 && substitute('months', months) ||
years < 1.5 && substitute('year', 1) ||
substitute('years', years);
/* eslint-enable no-multi-spaces */
if (!el.getAttribute('title')) {
el.setAttribute('title', el.textContent);
}
el.textContent = words + (distMillis < 0 ? ' from now' : ' ago');
}
[].forEach.call(args, el => setTimeAgo(el));
}
function displayHover(comment, sourceLink) {
const PADDING = 5; // in pixels
comment = comment.cloneNode(true);
comment.id = 'hover_preview';
comment.style.position = 'absolute';
comment.style.maxWidth = '980px';
comment.style.minWidth = '490px';
comment.style.boxShadow = '0px 0px 12px 0px rgba(0, 0, 0, 0.4)';
if (SHOW_PREVIEW_SPOILER) {
revealSpoiler(comment);
}
// relative time
timeAgo($$('time', comment));
const container = document.getElementById('comments') || document.getElementById('content');
if (container) container.appendChild(comment);
// calculate link position
const linkRect = sourceLink.getBoundingClientRect();
const linkTop = linkRect.top + viewportPosition().top;
const linkLeft = linkRect.left + viewportPosition().left;
const commentRect = comment.getBoundingClientRect();
let commentTop;
let commentLeft;
if (sourceLink.parentElement.classList.contains('comment_backlinks')) {
// When there is room, place the preview below the link,
// otherwise place it above the link
if (document.documentElement.clientHeight - linkRect.bottom > commentRect.height + PADDING) {
commentTop = linkTop + linkRect.height + PADDING;
commentLeft = (commentRect.width + linkLeft < document.documentElement.clientWidth) ? (
linkLeft
) : (
document.documentElement.clientWidth - (commentRect.width + PADDING)
);
} else {
commentTop = linkTop - commentRect.height - PADDING;
commentLeft = (commentRect.width + linkLeft < document.documentElement.clientWidth) ? (
linkLeft
) : (
document.documentElement.clientWidth - (commentRect.width + PADDING)
);
}
} else {
// When there is room, place the preview above the link
// otherwise place it to the right and aligns it to the top of viewport
if (linkRect.top > commentRect.height + PADDING) {
commentTop = linkTop - commentRect.height - PADDING;
commentLeft = (commentRect.width + linkLeft < document.documentElement.clientWidth) ? (
linkLeft
) : (
document.documentElement.clientWidth - (commentRect.width + PADDING)
);
} else {
commentTop = viewportPosition().top + PADDING;
commentLeft = linkLeft + linkRect.width + PADDING;
}
}
comment.style.top = commentTop + 'px';
comment.style.left = commentLeft + 'px';
}
function linkEnter(sourceLink, targetCommentID, isForumPost) {
sourceLink.setAttribute(HOVER_ATTRIBUTE, 1);
const selector = isForumPost ? 'post_' : 'comment_';
const targetComment = document.getElementById(selector + targetCommentID);
if (targetComment !== null) {
highlightReplyLink(targetComment, sourceLink, isForumPost);
if (!elementInViewport(targetComment)) {
displayHover(targetComment, sourceLink);
}
if (SHOW_HIGHLIGHT_SPOILER) {
revealSpoiler(targetComment);
}
// Highlight linked post
targetComment.children[0].style.backgroundColor = 'rgba(230,230,30,0.3)';
if ($('.comment_backlinks', targetComment) !== null) targetComment.children[1].style.backgroundColor = 'rgba(230,230,30,0.3)';
}
else if (!isForumPost) {
// External post, display from cached response if possible
if (fetchCache[targetCommentID] !== undefined) {
displayHover(fetchCache[targetCommentID], sourceLink);
} else {
const imageId = getImageId(sourceLink.href);
fetch(`${window.location.origin}/images/${imageId}/comments/${targetCommentID}`, {credentials: 'same-origin'})
.then((response) => {
if (!response.ok) throw new Error('Unable to fetch external comment.');
return response.text();
})
.then((text) => {
if (fetchCache[targetCommentID] === undefined && sourceLink.getAttribute(HOVER_ATTRIBUTE) !== '0') {
const d = document.createElement('div');
d.innerHTML = text;
fetchCache[targetCommentID] = d.firstChild;
displayHover(d.firstChild, sourceLink);
}
});
}
}
}
function linkLeave(sourceLink, targetCommentID, isForumPost) {
sourceLink.setAttribute(HOVER_ATTRIBUTE, 0);
const selector = isForumPost ? 'post_' : 'comment_';
const targetComment = document.getElementById(selector + targetCommentID);
const preview = document.getElementById('hover_preview');
if (targetComment !== null) {
// remove comment highlight
targetComment.children[0].style.backgroundColor = '';
if ($('.comment_backlinks', targetComment) !== null) targetComment.children[1].style.backgroundColor = '';
// remove link highlight
let ele = sourceLink;
while (ele.parentElement !== null && !ele.matches('article')) ele = ele.parentElement;
const sourceCommentID = ele.id.slice(selector.length);
const list = $$('a[href$="#' + selector + sourceCommentID + '"]', targetComment);
for (let i = 0; i < list.length; i++) {
list[i].style.textDecoration = '';
}
// unreveal spoilers
// we use the 'reveal-preview-spoiler' attribute to avoid reverting spoilers manually revealed by users
const spoilers = $$('.spoiler-revealed[reveal-preview-spoiler]', targetComment);
const imgspoilers = $$('.imgspoiler-revealed[reveal-preview-spoiler]', targetComment);
for (const spoiler of spoilers) {
spoiler.classList.remove('spoiler-revealed');
spoiler.classList.add('spoiler');
spoiler.removeAttribute('reveal-preview-spoiler');
}
for (const imgspoiler of imgspoilers) {
imgspoiler.classList.remove('imgspoiler-revealed');
imgspoiler.classList.add('imgspoiler');
imgspoiler.removeAttribute('reveal-preview-spoiler');
}
}
if (preview !== null) preview.parentElement.removeChild(preview);
}
// Chrome/Firefox compatibility hack for getting viewport position
function viewportPosition() {
return {
top: (document.documentElement.scrollTop || document.body.scrollTop),
left: (document.documentElement.scrollLeft || document.body.scrollLeft)
};
}
function elementInViewport(el) {
// Calculate the ratio of post height and viewport height, and clamp it to a min/max value,
// and use it to decide whether to use highlight or preview on a comment that's partially in view.
// The script will prefer the use of highlights on long comments,
// when using the preview might take up most of the viewport
const rect = el.getBoundingClientRect();
const ratio = Math.max(0.25, Math.min(0.95, rect.height / document.documentElement.clientHeight));
const margin = Math.round(rect.height * ratio); // pixels outside of viewport before element is considered out of view
return (
rect.top + margin >= 0 &&
rect.bottom - margin <= document.documentElement.clientHeight
);
}
function createBacklinksContainer(commentBody) {
let ele = $('div.comment_backlinks', commentBody);
if (ele === null) {
ele = document.createElement('div');
ele.className = 'block__content comment_backlinks';
ele.style.fontSize = '12px';
// Firefox 57 Workaround: getComputedStyle(commentBody.firstChild)['border-top'] returns an empty string
ele.style.borderTopStyle = window.getComputedStyle(commentBody.firstChild)['border-top-style'];
ele.style.borderTopWidth = window.getComputedStyle(commentBody.firstChild)['border-top-width'];
ele.style.borderTopColor = window.getComputedStyle(commentBody.firstChild)['border-top-color'];
commentBody.insertBefore(ele, $('.communication__options', commentBody));
}
return ele;
}
function insertBacklink(backlink, commentID, isForumPost) {
// add to cache
if (backlinksCache[commentID] === undefined) backlinksCache[commentID] = [];
if (backlinksCache[commentID].findIndex((ele) => (ele.hash == backlink.hash)) == -1) {
backlinksCache[commentID].push(backlink);
}
const selector = isForumPost ? 'post_' : 'comment_';
const commentBody = document.getElementById(selector + commentID);
if (commentBody !== null) {
const linksContainer = createBacklinksContainer(commentBody);
// insertion sort the links so they are ordered by id
if (linksContainer.children.length > 0) {
const iLinkID = getCommentId(backlink);
for (let i = 0; i < linksContainer.children.length; i++) {
const iTempID = getCommentId(linksContainer.children[i]);
if (iLinkID == iTempID) { // prevent links to the same comment from being added multiple times
return;
}
if (iLinkID < iTempID) {
linksContainer.insertBefore(backlink, linksContainer.children[i]);
return;
}
}
}
linksContainer.appendChild(backlink);
return;
}
}
function revealSpoiler(comment) {
const spoilers = $$('.spoiler', comment);
const imgspoilers = $$('.imgspoiler', comment);
for (const spoiler of spoilers) {
spoiler.classList.remove('spoiler');
spoiler.classList.add('spoiler-revealed');
spoiler.setAttribute('reveal-preview-spoiler', '1');
}
for (const imgspoiler of imgspoilers) {
imgspoiler.classList.remove('imgspoiler');
imgspoiler.classList.add('imgspoiler-revealed');
imgspoiler.setAttribute('reveal-preview-spoiler', '1');
}
}
function highlightReplyLink(comment, sourceLink, isForumPost) {
const selector = isForumPost ? 'post_' : 'comment_';
let ele = sourceLink;
while (ele.parentElement !== null && !ele.matches('article')) ele = ele.parentElement;
const sourceCommentID = ele.id.slice(selector.length);
const list = $$('a[href$="#' + selector + sourceCommentID + '"]', comment);
for (let i = 0; i < list.length; i++) {
list[i].style.textDecoration = 'underline dashed';
}
}
function getQueryVariable(key, HTMLAnchorElement) {
const array = HTMLAnchorElement.search.substring(1).split('&');
for (let i = 0; i < array.length; i++) {
if (key == array[i].split('=')[0]) {
return array[i].split('=')[1];
}
}
}
function getImageId(url) {
const regex = new RegExp('https?://(?:www\\.|philomena\\.)?(?:(?:derpibooru\\.org|trixiebooru\\.org)/(?:images/)?(\\d+)(?:\\?.*|/|\\.html)?|derpicdn\\.net/img/(?:view/|download/)?\\d+/\\d+/\\d+/(\\d+))', 'i');
const array = url.match(regex);
return (array !== null) ? array[1] || array[2] : null;
}
function getCommentId(backlink) {
// the regex expects the comment id in the format of '#post_1234' or '#comment_5678'
const regex = new RegExp('^#(?:post_|comment_)(\\d+)$');
return parseInt(regex.exec(backlink.hash)[1], 10);
}
function insertButton(displayText) {
const commentsBlock = $('#comments');
const ele = document.createElement('div');
ele.className = 'block__header';
ele.id = 'comment_loading_button';
ele.style.textAlign = 'center';
ele.appendChild(document.createElement('a'));
ele.firstChild.style.padding = '0px';
ele.firstChild.style.width = '100%';
ele.firstChild.innerText = displayText;
commentsBlock.insertBefore(ele, commentsBlock.lastElementChild);
return ele;
}
function loadComments(e, nextPage) {
const btn = document.getElementById('comment_loading_button');
const imageId = getImageId(window.location.href);
const fetchURL = `${window.location.origin}/images/${imageId}/comments?page=${nextPage}`;
btn.firstElementChild.innerText = 'Loading...';
fetch(fetchURL, {credentials: 'same-origin'}) // cookie needed for correct pagination
.then((response) => response.text())
.then((text) => {
// response text => documentFragment
const ele = document.createElement('div');
const range = document.createRange();
ele.innerHTML = text;
range.selectNodeContents(ele);
const fragment = range.extractContents();
const commentsBlock = document.getElementById('comments');
// update pagination blocks
commentsBlock.replaceChild(fragment.firstChild, commentsBlock.firstElementChild);
commentsBlock.replaceChild(fragment.lastChild, commentsBlock.lastElementChild);
// page marker
ele.innerHTML = '';
ele.className = 'block block__header';
ele.style.textAlign = 'center';
ele.innerText = 'Page ' + nextPage;
// relative time
timeAgo($$('time', fragment));
fragment.insertBefore(ele, fragment.firstElementChild);
commentsBlock.insertBefore(fragment, commentsBlock.lastElementChild);
// configure button to load the next batch of comments
btn.remove();
const navbar = $('nav', commentsBlock);
const btnNextPage = [...navbar.childNodes].find(node => node.innerHTML === 'Next ›');
if (btnNextPage) {
const btn = insertButton('Load more comments');
btn.addEventListener('click', (e) => {
loadComments(e, nextPage + 1);
});
}
});
}
NodeCreationObserver.onCreation('article[id^="comment_"], article[id^="post_"]', function (sourceCommentBody) {
const isForumPost = sourceCommentBody.matches('[id^="post_"]');
const selector = isForumPost ? 'post_' : 'comment_';
const links = $$(`.communication__body__text a[href*="#${selector}"]`, sourceCommentBody);
const sourceCommentID = sourceCommentBody.id.slice(selector.length);
const ele = $('.communication__body__sender-name > strong', sourceCommentBody);
const sourceAuthor = (ele.firstElementChild !== null && ele.firstElementChild.matches('a')) ? ele.firstElementChild.innerText : ele.innerHTML;
links.forEach((link) => {
const targetCommentID = link.hash.slice(selector.length + 1); // Example: link.hash == "#comment_5430424" or link.hash == "#post_5430424"
// add backlink if the comment is not part of a quote
// and not fetched
if (!link.matches('blockquote a') && !sourceCommentBody.matches('.fetched-comment')) {
const backlink = document.createElement('a');
backlink.style.marginRight = '5px';
backlink.href = '#' + selector + sourceCommentID;
backlink.textContent = '►';
backlink.innerHTML += sourceAuthor;
backlink.addEventListener('mouseenter', () => {
linkEnter(backlink, sourceCommentID, isForumPost);
});
backlink.addEventListener('mouseleave', () => {
linkLeave(backlink, sourceCommentID, isForumPost);
});
backlink.addEventListener('click', () => {
// force pageload instead of trying to navigate to a nonexistent anchor on the current page
if (document.getElementById(selector + sourceCommentID) === null) window.location.reload();
});
insertBacklink(backlink, targetCommentID, isForumPost);
}
if (DISABLE_NATIVE_PREVIEW && !isForumPost) {
link.addEventListener('click', (e) => {
e.stopPropagation();
e.preventDefault();
// quoted links doesn't contain query strings, this prevents page reload on links like "derpibooru.org/1234?q=tag"
const a = document.createElement('a');
if (document.getElementById(selector + targetCommentID) === null) {
a.href = e.currentTarget.href;
} else {
a.href = window.location.pathname + window.location.search + e.currentTarget.hash;
}
// Firefox requires the element to be inserted on the page for this to work
document.body.appendChild(a);
a.click();
a.remove();
// for paginated comments, when comment for the same image is on another page
if (window.location.pathname == e.currentTarget.pathname &&
document.getElementById(selector + targetCommentID) === null) {
window.location.reload();
}
});
}
link.addEventListener('mouseenter', () => {
linkEnter(link, targetCommentID, isForumPost);
});
link.addEventListener('mouseleave', () => {
linkLeave(link, targetCommentID, isForumPost);
});
});
// If other pages had replied to this comment
if (backlinksCache[sourceCommentID] !== undefined) {
backlinksCache[sourceCommentID].forEach((backlink) => {
insertBacklink(backlink, sourceCommentID, isForumPost);
});
}
});
// Load and append more comments
NodeCreationObserver.onCreation('#comments nav.pagination', function (navbar) {
if (document.getElementById('comment_loading_button') !== null) return;
const childNodes = [...navbar.childNodes];
const btnNextPage = childNodes.find(node => node.innerHTML === 'Next ›');
if (!btnNextPage) return;
const nextPage = parseInt(getQueryVariable('page', btnNextPage), 10);
const btn = insertButton('Load more comments');
btn.addEventListener('click', (e) => {
loadComments(e, nextPage);
});
});
// Add clickable links to hotlinked images
if (LINK_IMAGES) {
NodeCreationObserver.onCreation('.communication__body__text .imgspoiler>img, .image-description .imgspoiler>img', img => {
if (img.closest('a') !== null) return; // Image is already part of link so we do nothing.
const imgParent = img.parentElement;
const anchor = document.createElement('a');
const imageId = getImageId(img.src);
if (imageId !== null) {
// image is on Derpibooru
anchor.href = `/${imageId}`;
} else {
// camo.derpicdn.net
anchor.href = decodeURIComponent(img.src.substr(img.src.indexOf('?url=') + 5));
}
anchor.appendChild(img);
imgParent.appendChild(anchor);
});
}
})();