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Show ratings by your friends in a histogram, similar to the one Letterboxd shows for all user ratings.
// ==UserScript==
// @name Letterboxd Friend Ratings Analyzer
// @version 3.8
// @description Show ratings by your friends in a histogram, similar to the one Letterboxd shows for all user ratings.
// @match https://letterboxd.com/film/*
// @run-at document-end
// @namespace http://tampermonkey.net/
// ==/UserScript==
const username = "YOUR_USERNAME_HERE";
const film = location.pathname.split('/').at(-2);
const ratingString = (count) => count === 1 ? "rating" : "ratings";
const fetchRatings = (user, film) =>
fetch(`/${user}/friends/film/${film}/ratings/rated/.5-5/`)
.then(response => response.text())
.then(html =>
Array.from(new DOMParser().parseFromString(html, 'text/html').querySelectorAll(".film-rating-group"))
.flatMap(section => {
const [, score] = section.querySelector("h2 > .rating")?.className.match(/rated-large-(\d+)/) || [];
const reviewCount = section.querySelectorAll("ul.avatar-list > li").length;
return score ? Array(reviewCount).fill(parseFloat(score) / 2) : [];
})
);
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" style="height: 27px;">
<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} ${'★'.repeat(stars).concat(stars % 1 === 0 ? '' : '½')} ${ratingString(count)}">${stars}★ ${barHtml}</a>`
: `${stars}★ ${barHtml}`}
</li>
`;
}).join('')}
</ul>
<span class="rating-green rating-green-tiny rating-5"><span class="rating rated-10">★★★★★</span></span>
</div>
</section>
`;
};
const placeHistogram = (histogramHtml, averageRating, user, film, count) => {
const globalHistogramSection = document.querySelector('.ratings-histogram-chart');
if (globalHistogramSection) {
const friendsRatingsLink = `/${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="${friendsRatingsLink}" title="${count} ${ratingString(count)}">
<span class="display-rating">${averageRating}</span>
</a>
</span>
</h2>
${histogramHtml}
`;
globalHistogramSection.parentNode.insertBefore(friendsHistogramSection, globalHistogramSection.nextSibling);
}
};
fetchRatings(username, film)
.then(ratings => {
if (ratings.length) {
const averageRating = (ratings.reduce((sum, rating) => sum + rating, 0) / ratings.length).toFixed(1);
placeHistogram(constructHistogram(ratings, username, film), averageRating, username, film, ratings.length);
}
});