xitter digits observer

Displays the post ID number after the username/date and enables chan-style greentext formatting on x.com.
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// ==UserScript==
// @name         xitter digits observer
// @namespace    https://x.com/
// @version      1.4
// @description  Displays the post ID number after the username/date and enables chan-style greentext formatting on x.com.
// @match        https://x.com/*
// @match        https://twitter.com/*
// @author       @gigagroid
// @license      GNU GPLv3
// @grant        none
// @run-at       document-end
// ==/UserScript==

(function () {
    'use strict';

    // =========================
    // GREENTEXT (UNCHANGED CORE)
    // =========================
    function processGreentext(tweet) {
        if (tweet.dataset.gtDone === "1") return;
        tweet.dataset.gtDone = "1";

        const textContainer = tweet.querySelector('[data-testid="tweetText"]');
        if (!textContainer) return;

        const walker = document.createTreeWalker(
            textContainer,
            NodeFilter.SHOW_TEXT,
            null,
            false
        );

        const nodes = [];
        let n;

        while ((n = walker.nextNode())) nodes.push(n);

        nodes.forEach(textNode => {
            const text = textNode.nodeValue;
            if (!text.includes('>')) return;

            const frag = document.createDocumentFragment();
            const parts = text.split(/(\n)/);

            for (const part of parts) {
                if (part === '\n') {
                    frag.appendChild(document.createTextNode(part));
                    continue;
                }

                if (/^\s*>/.test(part)) {
                    const span = document.createElement('span');
                    span.style.color = 'rgb(90, 150, 65)';
                    span.textContent = part;
                    frag.appendChild(span);
                } else {
                    frag.appendChild(document.createTextNode(part));
                }
            }

            textNode.parentNode.replaceChild(frag, textNode);
        });
    }

    // =========================
    // POST ID (NATIVE INLINE STYLE)
    // =========================

    function getTweetKey(tweet) {
        const link = tweet.querySelector('a[href*="/status/"]');
        return link?.href || null;
    }

    function processTweet(tweet) {
        processGreentext(tweet);

        const key = getTweetKey(tweet);
        if (!key) return;

        const match = key.match(/status\/(\d+)/);
        if (!match) return;

        const postId = match[1];

        const nameContainer = tweet.querySelector('[data-testid="User-Name"]');
        if (!nameContainer) return;

        // prevent duplicates even after X re-render
        if (tweet.dataset.xPostId === postId) return;
        tweet.dataset.xPostId = postId;

        // IMPORTANT: find last metadata text node (where " · time" lives)
        const walker = document.createTreeWalker(
            nameContainer,
            NodeFilter.SHOW_TEXT,
            null,
            false
        );

        let lastTextNode = null;
        let node;

        while ((node = walker.nextNode())) {
            lastTextNode = node;
        }

        // fallback if structure changes
        const target = lastTextNode || nameContainer;

        // insert EXACT native-style separator + id
        const injection = document.createTextNode(` · >>${postId}`);

        // if we have a text node, append to it; otherwise append to container
        if (target.nodeType === Node.TEXT_NODE) {
            target.nodeValue += ` · >>${postId}`;
        } else {
            target.appendChild(injection);
        }
    }

    // =========================
    // RESILIENT SCANNER
    // =========================
    function scan(root = document) {
        root.querySelectorAll('[data-testid="tweet"]').forEach(processTweet);
    }

    const observer = new MutationObserver((mutations) => {
        for (const m of mutations) {
            for (const node of m.addedNodes) {
                if (node.nodeType !== 1) continue;

                if (node.matches?.('[data-testid="tweet"]')) {
                    processTweet(node);
                } else {
                    node.querySelectorAll?.('[data-testid="tweet"]')?.forEach(processTweet);
                }
            }
        }
    });

    scan();

    observer.observe(document.body, {
        childList: true,
        subtree: true
    });

    // backup for full React tree rewrites
    setInterval(scan, 5000);

})();