Hides comments with low rating.
// ==UserScript==
// @name Habr Comments Filter
// @name:ru Хабр Фильтр комментов
// @namespace habr_comments_filter
// @version 2.0.1
// @description Hides comments with low rating.
// @description:ru Спрятать комменты с оценкой ниже выбранной.
// @author Dystopian
// @license WTFPL
// @match https://habr.com/*
// @icon https://habr.com/favicon.ico
// @grant GM_log
// @run-at document-end
// ==/UserScript==
(function() {
'use strict';
const COMMENT_HIGHLIGHT_LIGHT = '#fff7d7';
const COMMENT_HIGHLIGHT_DARK = '#484028';
let DEBUG = 0;
let currentThreshold = null;
let observer;
let isCreatingButton = false;
// custom log - useful for mobile version debug
let isCustomLog = false;
let isCustomLogCollapsed = true;
const customLogBoxID = 'custom-log-box';
const customLogBuffer = [];
function getTimestamp() {
const d = new Date();
const pad = (n, z = 2) => ('00' + n).slice(-z);
return `${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}.${pad(d.getMilliseconds(), 3)}`;
}
function formatElement(el) {
if (!(el instanceof Element)) return String(el);
let s = `<${el.tagName.toLowerCase()}`;
if (el.id) s += `#${el.id}`;
if (el.className) s += '.' + el.className.trim().replace(/\s+/g, '.');
return s + '>';
}
function smartFormat(x) {
if (x instanceof Event) return `[Event ${x.type} ${x.constructor.name}] target=${formatElement(x.target)}`;
if (x instanceof Element) return formatElement(x);
try {return JSON.stringify(x);}
catch {return String(x);}
}
function customLog(...args) {
const maxLines = 100;
const msg = args.map(smartFormat).join(' ');
customLogBuffer.push(`${getTimestamp()} ${msg}`);
if (customLogBuffer.length > maxLines) customLogBuffer.shift();
renderCustomLog();
}
function renderCustomLog() {
let pre = document.getElementById(customLogBoxID);
if (!pre) {
const box = document.createElement('div');
Object.assign(box.style, {
position: 'fixed',
bottom: '0',
left: '0',
width: '100%',
maxHeight: '10em',
overflowY: 'auto',
color: 'lime',
fontSize: '10px',
fontFamily: 'monospace',
zIndex: '999999',
padding: '4px',
});
const btn = document.createElement('button');
Object.assign(btn.style, {
position: 'fixed',
right: '4px',
background: 'rgba(0,0,0,0.8)',
border: '1px solid lime',
color: 'inherit',
});
btn.onclick = () => {
isCustomLogCollapsed = !isCustomLogCollapsed;
if (isCustomLogCollapsed) {
pre.style.display = 'none';
box.style.height = '1.5em';
box.style.background = '';
btn.textContent = '+';
} else {
pre.style.display = '';
box.style.height = '';
box.style.background = 'rgba(0,0,0,0.8)';
btn.textContent = '−';
pre.textContent = customLogBuffer.join('\n');
box.scrollTop = box.scrollHeight;
}
};
box.appendChild(btn);
pre = document.createElement('pre');
pre.id = customLogBoxID;
Object.assign(pre.style, {
margin: '0',
whiteSpace: 'pre-wrap',
fontFamily: 'inherit',
fontSize: 'inherit',
color: 'inherit',
});
box.appendChild(pre);
document.body.appendChild(box);
isCustomLogCollapsed = !isCustomLogCollapsed;
btn.click(); // init state
}
if (!isCustomLogCollapsed) {
pre.textContent = customLogBuffer.join('\n');
pre.parentElement.scrollTop = pre.parentElement.scrollHeight;
}
}
function log(level, ...args) {
if (DEBUG < level) return;
if (isCustomLog) customLog(...args);
console.log('[comments-filter]', ...args);
}
const cssVarName = '--good-comment-background';
const cssColor = `var(${cssVarName})`;
function isDarkTheme() {
const darkLink = document.querySelector('#dark-colors');
const lightLink = document.querySelector('#light-colors');
if (darkLink?.media === 'all' && !darkLink.disabled) return true;
if (lightLink?.media === 'all' && !lightLink.disabled) return false;
return window.matchMedia('(prefers-color-scheme: dark)').matches;
}
function applyHighlightColor() {
const newValue = isDarkTheme() ? COMMENT_HIGHLIGHT_DARK : COMMENT_HIGHLIGHT_LIGHT;
const rootStyle = document.documentElement.style;
const current = rootStyle.getPropertyValue(cssVarName).trim();
if (current !== newValue) {
log(1, "applyHighlightColor", current, newValue);
rootStyle.setProperty(cssVarName, newValue);
}
}
function initHighlightColors() {
applyHighlightColor();
const observer = new MutationObserver(applyHighlightColor);
observer.observe(document.head, { attributes: true, subtree: true });
const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
mediaQuery.addEventListener('change', applyHighlightColor);
}
function findCommentsWrapper() {
return document.querySelector('div.tm-comments-wrapper__wrapper');
}
function findCommentsTree(wrapper) {
return wrapper.querySelector('div.tm-comments__tree');
}
function findCommentsHeader(wrapper) {
return wrapper.querySelector('header.tm-comments-wrapper__header');
}
function getAllSections(tree) {
return tree.querySelectorAll('section.tm-comment-thread');
}
function getChildSections(section) {
return section.querySelectorAll(':scope > div.tm-comment-thread__children > section.tm-comment-thread');
}
function getSectionChildrenBlock(section) {
return section.querySelector(':scope > div.tm-comment-thread__children');
}
function getSectionHeader(section) {
return section.querySelector(':scope > article > div > div.tm-comment > header.tm-comment__header');
}
function getSectionBody(section) {
return section.querySelector(':scope > article > div, :scope > article > span.tm-comment-thread__ufo');
}
function extractCommentScore(section) {
const span = section.querySelector(':scope > article span:is(.tm-votes-meter__value, .tm-votes-lever__score-counter)');
if (!span) return 0;
log(3, "extractCommentScore", span.textContent);
return parseInt(span.textContent.trim(), 10) || 0;
}
function setFlag(el, key, value) {
el.dataset[key] = value ? "1" : "";
}
function getFlag(el, key) {
return el.dataset[key] === "1";
}
function resetCommentsFilter(tree) {
log(1, 'resetCommentsFilter');
tree.querySelectorAll('a.comment-placeholder').forEach(p => p.remove());
getAllSections(tree).forEach(section => {
section.style.display = '';
getSectionBody(section)?.style?.setProperty('display', '');
getSectionChildrenBlock(section)?.style?.setProperty('display', '');
getSectionHeader(section)?.style?.setProperty('background-image', '');
section.dataset.isGood = '';
section.dataset.hasGood = '';
section.dataset.hasGoodChild = '';
});
}
function markComments(section, parentComment = null) {
const score = extractCommentScore(section);
section.dataset.score = score; // for debug
const isGood = score >= currentThreshold;
setFlag(section, "isGood", isGood);
if (parentComment && isGood) setFlag(parentComment, "hasGoodChild", true);
let hasGood = isGood;
getChildSections(section).forEach(childSection => {
if (markComments(childSection, section)) {
hasGood = true;
}
});
setFlag(section, "hasGood", hasGood);
log(2, 'mark', {score, isGood, hasGood});
return hasGood;
}
function collapseCommentWithPlaceholder(section, withChildren = true) {
log(2, 'collapseCommentWithPlaceholder', section, withChildren);
const article = section.querySelector(':scope > article');
if (!article) return;
const articleUfoSelector = ':scope > span.tm-comment-thread__ufo';
const sectionChildrenBlock = getSectionChildrenBlock(section);
// do not hide UFO without children
if (!sectionChildrenBlock && article.querySelector(articleUfoSelector)) return;
if (withChildren && sectionChildrenBlock) {
sectionChildrenBlock.style.setProperty('display', 'none');
}
const placeholder = document.createElement('a');
placeholder.textContent = 'раскрыть';
placeholder.href = '#';
placeholder.className = 'comment-placeholder';
placeholder.style.textDecoration = 'none';
const articleContent = article.querySelector(':scope > div, ' + articleUfoSelector);
if (articleContent) {
placeholder.className += ' ' + articleContent.className; // copy margin
articleContent.style.display = 'none';
}
article.appendChild(placeholder);
}
function processCommentThread(section, isRoot = false) {
log(2, 'processCommentThread', section, isRoot, {score: section.dataset.score, isGood: section.dataset.isGood, hasGood: section.dataset.hasGood, hasGoodChild: section.dataset.hasGoodChild});
if (getFlag(section, "isGood") || getFlag(section, "hasGoodChild")) {
log(2, 'isGood or hasGoodChild', section);
if (getFlag(section, "isGood")) {
const header = getSectionHeader(section);
log(2, 'check header=', header);
if (header) {
// if header is already colored, blend it; else fill
const headerCurrentBackgroundColor = getComputedStyle(header).backgroundColor;
log(2, 'header color', headerCurrentBackgroundColor);
const emptyColorComputedString = 'rgba(0, 0, 0, 0)'; // getComputedStyle returns exactly this
// cssColor here handles cleared background right after resetCommentsFilter
const firstGradientColor = [emptyColorComputedString, cssColor].includes(headerCurrentBackgroundColor) ? cssColor : emptyColorComputedString;
header.style.backgroundImage = `linear-gradient(to right, ${firstGradientColor}, ${cssColor})`;
}
}
getChildSections(section).forEach(childSection => {
log(3, 'childSection', childSection, {score: childSection.dataset.score, isGood: childSection.dataset.isGood, hasGood: childSection.dataset.hasGood, hasGoodChild: childSection.dataset.hasGoodChild});
if (getFlag(childSection, "hasGood")) {
processCommentThread(childSection);
} else {
collapseCommentWithPlaceholder(childSection);
}
});
} else if (getFlag(section, "hasGood")) {
log(2, 'hasGood', section);
collapseCommentWithPlaceholder(section, false);
getChildSections(section).forEach(childSection => {
if (getFlag(childSection, "hasGood")) {
processCommentThread(childSection);
} else {
childSection.style.display = 'none';
}
});
} else {
if (isRoot) {
log(2, 'bad root', section);
section.style.display = 'none';
} else {
log(2, 'bad non-root', section);
collapseCommentWithPlaceholder(section);
}
}
}
function applyCommentsFilter(tree) {
log(0, 'applyCommentsFilter threshold=', currentThreshold);
const roots = tree.querySelectorAll(':scope > section.tm-comment-thread');
roots.forEach(root => {
markComments(root);
processCommentThread(root, true);
});
}
function onPlaceholderClick(e) {
const placeholder = e.target.closest('a.comment-placeholder');
if (!placeholder) return;
e.preventDefault();
const section = placeholder.parentElement.parentElement;
placeholder.remove();
log(1, 'placeholder clicked', section);
section.style.pointerEvents = 'none'; // remove pointerEvents to prevent hover popup
section.style.display = '';
getSectionBody(section)?.style?.setProperty('display', '');
getSectionChildrenBlock(section)?.style?.setProperty('display', '');
getChildSections(section).forEach(childSection => {
if (!getFlag(childSection, "hasGood")) collapseCommentWithPlaceholder(childSection);
});
// get pointerEvents back
const events = ['pointermove','mousemove','scroll'];
const restore = (e) => {
section.style.pointerEvents = '';
log(1, 'event restore', e);
events.forEach(evt => document.removeEventListener(evt, restore));
};
events.forEach(evt => {
document.addEventListener(evt, restore, { passive: true });
});
}
function onVotesClick(e) {
const a = e.target.closest('a.votes-summary__item');
if (!a) return;
e.preventDefault();
const score = parseInt(a.dataset.score, 10);
log(0,'filter click score=', score, 'current=', currentThreshold);
const wrapper = findCommentsWrapper();
const tree = findCommentsTree(wrapper);
if (currentThreshold === score) {
resetCommentsFilter(tree);
currentThreshold = null;
} else {
if (currentThreshold !== null) resetCommentsFilter(tree);
currentThreshold = score;
applyCommentsFilter(tree);
}
// (un)highlight summary votes
wrapper.querySelectorAll('a.votes-summary__item').forEach(item => {
const itemScore = parseInt(item.dataset.score, 10);
if (currentThreshold !== null && itemScore >= currentThreshold) {
item.style.background = cssColor;
} else {
item.style.background = '';
}
});
}
async function scrollAllComments() {
log(1,"scrolling");
const oldY = window.pageYOffset;
const oldVis = document.body.style.visibility;
// делаем невидимым, чтобы не мельтешило
document.body.style.visibility = "hidden";
for (let y = window.scrollY + window.innerHeight; y < document.scrollingElement.scrollHeight + window.innerHeight; y += window.innerHeight) {
window.scrollTo(0, y);
// await new Promise(r => setTimeout(r, 0)); // дать движку отработать
await new Promise(r => requestAnimationFrame(r)); // дать движку отработать
}
window.scrollTo(0, oldY);
document.body.style.visibility = oldVis;
}
async function buildVotesSummary(button) {
if (observer) observer.disconnect();
await scrollAllComments();
const wrapper = findCommentsWrapper();
const votes = {};
const allSections = getAllSections(findCommentsTree(wrapper));
const total = allSections.length;
allSections.forEach(section => {
const score = extractCommentScore(section);
votes[score] = (votes[score] || 0) + 1;
log(2, section, score);
});
const sorted = Object.entries(votes).sort((a,b)=>b[0]-a[0]);
log(0, 'votes summary built', total, sorted);
const frag = document.createDocumentFragment();
const totalSpan = document.createElement('span');
totalSpan.textContent = total + ': ';
frag.appendChild(totalSpan);
sorted.forEach(([score, count]) => {
const a = document.createElement('a');
a.href='#';
a.textContent = score;
a.className = 'votes-summary__item tm-votes-lever__score-counter';
a.style.textDecoration = 'none';
a.style.padding = '3px';
if (score > 0) {
a.classList.add('tm-votes-lever__score-counter_positive');
} else if (score < 0) {
a.classList.add('tm-votes-lever__score-counter_negative');
}
a.dataset.score = score;
frag.appendChild(a);
frag.append(count <= 1 ? ' ' : "(" + count + ") ");
});
wrapper.querySelector('#votes-summary')?.remove();
const summary = document.createElement('div');
summary.id = 'votes-summary';
summary.style.color = 'var(--mine-shaft)'; // for dark theme
summary.appendChild(frag);
findCommentsHeader(wrapper).insertAdjacentElement('afterend', summary);
button.disabled = false;
}
function createVotesButton(header) {
log(0, 'createVotesButton', header);
const button = document.createElement('button');
button.id = 'comments-votes-button';
button.textContent = 'Оценки';
button.onclick = () => {
button.disabled = true;
// если есть кнопка "Показать все комментарии"
document.querySelector('button.tm-height-limiter__expand-button')?.click();
setTimeout(() => buildVotesSummary(button), 0); // wait for expand button
};
header.appendChild(button);
isCreatingButton = false;
}
function ensureVotesButton(caller) {
log(1, "ensureVotesButton", caller);
// sometimes button disappears when comments load. We have to recreate it. We stop observer on button click
if (isCreatingButton || document.getElementById('comments-votes-button')) return;
const wrapper = findCommentsWrapper();
if (!wrapper) return;
if (!findCommentsTree(wrapper)) return;
const header = findCommentsHeader(wrapper);
if (!header) return;
isCreatingButton = true;
createVotesButton(header);
}
function init() {
log(0, 'init start');
if (!document.querySelector('div.tm-article-comments, div.tm-article-blocks')) return; // ignore pages without comments
document.body.addEventListener('click', onVotesClick);
document.body.addEventListener('click', onPlaceholderClick);
ensureVotesButton(0);
observer = new MutationObserver((mutations) => {
for (const m of mutations) {if (m.target.closest('#' + customLogBoxID)) return;} // ignore custom log changes
ensureVotesButton(1)
});
observer.observe(document.body, { childList: true, subtree: true });
initHighlightColors();
}
window.addEventListener('load', init);
})();