Automatically hides posts and comments on Reddit based on keywords or subreddits you specify. Case-insensitive filtering supports plural forms. Perfect for curating your feed.
// ==UserScript==
// @name Reddit Advanced Content Filter
// @namespace https://greasyfork.org/en/users/567951-stuart-saddler
// @version 2.2
// @description Automatically hides posts and comments on Reddit based on keywords or subreddits you specify. Case-insensitive filtering supports plural forms. Perfect for curating your feed.
// @author Stuart Saddler
// @license MY
// @icon https://clipart-library.com/images_k/smoke-clipart-transparent/smoke-clipart-transparent-6.png
// @supportURL https://greasyfork.org/en/users/567951-stuart-saddler
// @match *://www.reddit.com/*
// @match *://old.reddit.com/*
// @run-at document-end
// @grant GM.getValue
// @grant GM.setValue
// @grant GM_addStyle
// @grant GM_registerMenuCommand
// @grant GM_unregisterMenuCommand
// ==/UserScript==
(async function() {
'use strict';
const postSelector = 'article, div[data-testid="post-container"], shreddit-post';
let filteredCount = 0;
let menuCommand = null;
let processedPosts = new Set();
let blocklistArray = [];
let keywordPattern = null;
let shortKeywords = new Set();
let longKeywords = [];
const CSS = `
.content-filtered { display: none !important; height: 0 !important; overflow: hidden !important; }
.reddit-filter-dialog { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: white; padding: 20px; border-radius: 8px; z-index: 1000000; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15); min-width: 300px; max-width: 350px; font-family: Arial, sans-serif; color: #333; }
.reddit-filter-dialog h2 { margin-top: 0; color: #0079d3; font-size: 1.5em; font-weight: bold; }
.reddit-filter-dialog p { font-size: 0.9em; margin-bottom: 10px; color: #555; }
.reddit-filter-dialog textarea { width: calc(100% - 16px); height: 150px; padding: 8px; margin: 10px 0; border: 1px solid #ccc; border-radius: 4px; font-family: monospace; background: #f9f9f9; color: #000; resize: vertical; }
.reddit-filter-dialog .button-container { display: flex; justify-content: flex-end; gap: 10px; margin-top: 10px; }
.reddit-filter-dialog button { display: flex; align-items: center; justify-content: center; padding: 8px 16px; border: none; border-radius: 4px; cursor: pointer; font-size: 1em; text-align: center; }
.reddit-filter-dialog .save-btn { background-color: #0079d3; color: white; }
.reddit-filter-dialog .cancel-btn { background-color: #f2f2f2; color: #333; }
.reddit-filter-dialog button:hover { opacity: 0.9; }
.reddit-filter-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0, 0, 0, 0.5); z-index: 999999; }
`;
if (typeof GM_addStyle !== 'undefined') {
GM_addStyle(CSS);
} else {
const style = document.createElement('style');
style.textContent = CSS;
document.head.appendChild(style);
}
const getKeywordPattern = (keywords) => {
const escapedKeywords = keywords.map(k => k.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')).join('|');
return new RegExp(`\\b(${escapedKeywords})(s|es|ies)?\\b`, 'i');
};
const cleanupProcessedPosts = () => {
if (processedPosts.size > 10000) {
processedPosts.clear();
}
};
setInterval(cleanupProcessedPosts, 300000);
async function showConfig() {
const overlay = document.createElement('div');
overlay.className = 'reddit-filter-overlay';
const dialog = document.createElement('div');
dialog.className = 'reddit-filter-dialog';
dialog.innerHTML = `
<h2>Reddit Filter: Blocklist</h2>
<p>Enter keywords or subreddit names one per line. Filtering is case-insensitive.</p>
<p><em>Keywords can match common plural forms (e.g., "apple" blocks "apples"). Irregular plurals (e.g., "mouse" and "mice") must be added separately. Subreddit names should be entered without the "r/" prefix (e.g., "subredditname").</em></p>
<textarea spellcheck="false" id="blocklist">${blocklistArray.join('\n')}</textarea>
<div class="button-container">
<button class="cancel-btn">Cancel</button>
<button class="save-btn">Save</button>
</div>
`;
document.body.appendChild(overlay);
document.body.appendChild(dialog);
const closeDialog = () => {
dialog.remove();
overlay.remove();
};
dialog.querySelector('.save-btn').addEventListener('click', async () => {
const blocklistInput = dialog.querySelector('#blocklist').value;
blocklistArray = blocklistInput
.split('\n')
.map(item => item.trim().toLowerCase())
.filter(item => item.length > 0);
shortKeywords = new Set(blocklistArray.filter(k => k.length < 4));
longKeywords = blocklistArray.filter(k => k.length >= 4);
keywordPattern = getKeywordPattern(longKeywords);
await GM.setValue('blocklist', blocklistArray);
closeDialog();
location.reload();
});
dialog.querySelector('.cancel-btn').addEventListener('click', closeDialog);
overlay.addEventListener('click', closeDialog);
}
function createFallbackButton() {
const button = document.createElement('button');
button.innerHTML = `Configure Blocklist (${filteredCount} blocked)`;
button.style.cssText = 'position:fixed;top:10px;right:10px;z-index:999999;padding:8px;';
button.addEventListener('click', showConfig);
document.body.appendChild(button);
}
function updateCounter() {
if (typeof GM_registerMenuCommand !== 'undefined') {
if (menuCommand !== null) {
GM_unregisterMenuCommand(menuCommand);
}
menuCommand = GM_registerMenuCommand(
`Configure Blocklist (${filteredCount} blocked)`,
showConfig
);
} else {
createFallbackButton();
}
}
async function processPostsBatch(posts) {
const batchSize = 10;
for (let i = 0; i < posts.length; i += batchSize) {
const batch = posts.slice(i, i + batchSize);
await new Promise(resolve => requestIdleCallback(resolve, { timeout: 1000 }));
batch.forEach(post => processPost(post));
}
}
function processPost(post) {
if (!post || processedPosts.has(post)) return;
processedPosts.add(post);
let shouldHide = false;
const subredditElement = post.getElementsByClassName('subreddit')[0] ||
post.querySelector('a[data-click-id="subreddit"]');
if (subredditElement) {
const subredditName = subredditElement.textContent.trim().replace(/^r\//i, '').toLowerCase();
if (blocklistArray.includes(subredditName)) {
shouldHide = true;
}
}
if (!shouldHide && (shortKeywords.size > 0 || longKeywords.length > 0)) {
const postContent = post.textContent.toLowerCase();
shouldHide = Array.from(shortKeywords).some(keyword => postContent.includes(keyword)) ||
(longKeywords.length > 0 && keywordPattern.test(postContent));
}
if (shouldHide) {
requestIdleCallback(() => {
post.classList.add('content-filtered');
const parentArticle = post.closest(postSelector);
if (parentArticle) {
parentArticle.classList.add('content-filtered');
}
filteredCount++;
updateCounter();
}, { timeout: 1000 });
}
}
const debouncedUpdate = debounce((posts) => {
processPostsBatch(Array.from(posts));
}, 100);
function debounce(func, wait) {
let timeout;
return (...args) => {
clearTimeout(timeout);
timeout = setTimeout(() => {
timeout = null;
func.apply(this, args);
}, wait);
};
}
async function init() {
blocklistArray = (await GM.getValue('blocklist', [])).map(item => item.toLowerCase());
shortKeywords = new Set(blocklistArray.filter(k => k.length < 4));
longKeywords = blocklistArray.filter(k => k.length >= 4);
keywordPattern = getKeywordPattern(longKeywords);
updateCounter();
const observerTarget = document.getElementById('main-content') || document.body;
const observer = new MutationObserver(mutations => {
const newPosts = new Set();
mutations.forEach(mutation => {
mutation.addedNodes.forEach(node => {
if (node.nodeType === Node.ELEMENT_NODE) {
if (node.matches?.(postSelector)) {
newPosts.add(node);
}
node.querySelectorAll?.(postSelector).forEach(post => newPosts.add(post));
}
});
});
if (newPosts.size > 0) {
debouncedUpdate(newPosts);
}
});
observer.observe(observerTarget, { childList: true, subtree: true });
const initialPosts = document.getElementsByClassName('thing') ||
document.querySelectorAll(postSelector);
if (initialPosts.length > 0) {
debouncedUpdate(initialPosts);
}
}
await init();
})();