letterboxd-copy-ids.user.js

// ==UserScript==
// @name         Letterboxd IMDb/TMDB ID Copier
// @author       calliah333
// @namespace    https://letterboxd.com/
// @version      1.0.0
// @description  Copy a film's IMDb or TMDB ID by Shift-clicking its IMDb or TMDB button.
// @match        https://letterboxd.com/film/*
// @grant        GM_setClipboard
// @run-at       document-start
// ==/UserScript==

(function () {
    'use strict';

    const feedback = new WeakMap();

    function getId(service, href) {
        const pathname = new URL(href, location.href).pathname;
        const match = service === 'IMDB'
            ? pathname.match(/\/title\/(tt\d+)(?:\/|$)/i)
            : pathname.match(/\/(?:movie|tv)\/(\d+)(?:[-/]|$)/i);

        return match?.[1] ?? null;
    }

    function showCopied(button, id) {
        let state = feedback.get(button);

        if (state) {
            clearTimeout(state.timer);
        } else {
            state = {
                text: button.textContent,
                title: button.getAttribute('title'),
                timer: 0,
            };
            feedback.set(button, state);
        }

        button.textContent = 'Copied!';
        button.title = `Copied ${id}`;
        state.timer = setTimeout(() => {
            button.textContent = state.text;
            if (state.title === null) {
                button.removeAttribute('title');
            } else {
                button.title = state.title;
            }
            feedback.delete(button);
        }, 1200);
    }

    document.addEventListener('click', (event) => {
        if (!event.shiftKey || event.button !== 0 || !(event.target instanceof Element)) {
            return;
        }

        const button = event.target.closest('a[data-track-action]');
        const service = button?.dataset.trackAction?.toUpperCase();
        if (service !== 'IMDB' && service !== 'TMDB') {
            return;
        }

        const id = getId(service, button.href);
        if (!id) {
            return;
        }

        event.preventDefault();
        event.stopImmediatePropagation();
        GM_setClipboard(id, 'text');
        showCopied(button, id);
    }, true);
}());