Analyze ratings from friends on Letterboxd, including paginated ratings, and show a histogram below the global one.
当前为
// ==UserScript==
// @name Letterboxd Friend Ratings Analyzer
// @namespace http://tampermonkey.net/
// @version 3.1
// @description Analyze ratings from friends on Letterboxd, including paginated ratings, and show a histogram below the global one.
// @author https://github.com/liam-h
// @match https://letterboxd.com/film/*
// @grant none
// @license GPLv3
// @run-at document-end
// ==/UserScript==
// Sleep function
const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
// Extract username and film name from the URL
const extractUserAndFilm = async () => {
let attempt = 0;
while (!document.querySelector('.activity-from-friends > h2 > a') && attempt < 100) {
await sleep(100);
attempt++;
}
const linkElement = document.querySelector('.activity-from-friends > h2 > a');
const [username, film] = linkElement.href.split('/').slice(3, 8).filter((_, i) => i === 0 || i === 3);
return { username, film };
};
// Fetch all ratings, including paginated pages
const fetchAllRatings = async (user, film) => {
let page = 1;
let allRatings = [];
let hasMorePages = true;
while (hasMorePages) {
const ratingsFromPage = await fetchRatingsPage(user, film, page);
allRatings = [...allRatings, ...ratingsFromPage];
hasMorePages = ratingsFromPage.length > 0;
page++;
}
return allRatings;
};
// Fetch ratings from a single page
const fetchRatingsPage = async (user, film, page) => {
const url = `https://letterboxd.com/${user}/friends/film/${film}/rated/.5-5/page/${page}`;
const response = await fetch(url);
const doc = new DOMParser().parseFromString(await response.text(), 'text/html');
return Array.from(doc.querySelectorAll('.person-table.film-table tbody tr'))
.map(row => {
const ratingClass = [...row.querySelector('.film-detail-meta .rating').classList]
.find(cls => cls.startsWith('rated-'));
return ratingClass ? parseFloat(ratingClass.replace('rated-', '')) / 2 : null;
}).filter(Boolean);
};
// Calculate average rating for friends
const calculateAverage = ratings => (ratings.reduce((sum, rating) => sum + rating, 0) / ratings.length).toFixed(1);
// Construct the friends' rating histogram with links
const constructHistogram = (ratings, user, film) => {
const bins = Array(10).fill(0);
ratings.forEach(rating => bins[Math.floor((rating - 0.5) * 2)]++);
const maxCount = Math.max(...bins);
return `
<section class="section ratings-histogram-chart">
<div class="rating-histogram rating-histogram-exploded">
<span class="rating-green rating-green-tiny rating-1"><span class="rating rated-2">★</span></span>
<ul>
${bins.map((count, index) => {
const stars = ((index / 2) + 0.5).toFixed(1);
const ratingLink = `/${user}/friends/film/${film}/rated/${stars}/`;
const barHtml = `<i style="height: ${(maxCount ? (count / maxCount) * 44 : 1)}px;"></i>`;
return `
<li class="rating-histogram-bar" style="width: 15px; left: ${index * 16}px">
${count > 0
? `<a href="${ratingLink}" class="ir tooltip" title="${count} ratings">${stars}★ ${barHtml}</a>`
: `${stars}★ ${barHtml}`}
</li>
`;
}).join('')}
</ul>
<span class="rating-green rating-green-tiny rating-5"><span class="rating rated-10">★★★★★</span></span>
</div>
</section>
`;
};
// Place histogram below the global one, adding links
const placeHistogram = (histogramHtml, averageRating, user, film) => {
const globalHistogramSection = document.querySelector('.ratings-histogram-chart');
if (globalHistogramSection) {
const friendsRatingsLink = `/${user}/friends/film/${film}/rated/.5-5/`;
const friendsHistogramSection = document.createElement('section');
friendsHistogramSection.classList.add('section', 'ratings-histogram-chart');
friendsHistogramSection.innerHTML = `
<h2 class="section-heading">
<a href="${friendsRatingsLink}">Ratings from friends</a>
<span class="average-rating">
<a href="${friendsRatingsLink}">
<span class="display-rating">${averageRating}</span>
</a>
</span>
</h2>
${histogramHtml}
`;
globalHistogramSection.parentNode.insertBefore(friendsHistogramSection, globalHistogramSection.nextSibling);
}
};
// Main function to run the script
(async () => {
const { username, film } = await extractUserAndFilm();
const ratings = await fetchAllRatings(username, film);
if (ratings.length) {
const averageRating = calculateAverage(ratings);
placeHistogram(constructHistogram(ratings, username, film), averageRating, username, film);
}
})();