Java (jshell) program to find "Top 10" worst accuracies (of analysed Lichess games)

worst.jsh

String userId = "tors42";  // User to check "Top" 10 worst accuracies for


// Optional token (download a bit faster) https://lichess.org/account/oauth/token/create
String token  = "";

if (! Files.exists(Path.of("chariot.jar"))) {
    Files.write(Path.of("chariot.jar"), URI.create(
        "https://repo1.maven.org/maven2/io/github/tors42/chariot/0.0.86/chariot-0.0.86.jar"
        ).toURL().openStream().readAllBytes());
}
/env --class-path chariot.jar

import chariot.*;
import chariot.model.*;
import chariot.model.Player.*;

void showWorstGames(Client client, User user) {

    var dateFormat = java.time.format.DateTimeFormatter.ISO_LOCAL_DATE;
    var counter = new java.util.concurrent.atomic.AtomicInteger();

    Consumer<Game> peekaboo = game -> {
        if(Integer.valueOf(counter.getAndIncrement()) instanceof Integer count && count % 10 == 0)
            System.out.print("\rFound %d games. Currently at %s".formatted(
                count, game.createdAt().format(dateFormat)));
    };

    Function<Game, Player> pointOfView = game -> user.name().equals(game.players().white().name()) ?
        game.players().white() : game.players().black();

    record GameAccuracy(Game game, int accuracy) {}

    var games = client.games().byUserId(user.id(), p -> p.analysed().accuracy()).stream().
        peek(peekaboo).
        map(game -> new GameAccuracy(game,
            switch(pointOfView.apply(game)) {
                case Analysed(_, Analysis(_,_,_,_,Some(var accuracy))) -> accuracy;
                default -> 0;
                })).
        sorted(Comparator.comparingInt(GameAccuracy::accuracy)).
        toList();

    System.out.println();
    games.stream().limit(10).map(entry -> "https://lichess.org/%s - %d%% - %s".formatted(
            entry.game().id(), entry.accuracy(), entry.game().createdAt().format(dateFormat))).
        forEach(System.out::println);
}

var client = Client.basic();
if (! token.isEmpty()) client = client.withToken(token);

var result = client.users().byId(userId);
if (result instanceof Entry(var user)) {
    showWorstGames(client, user);
} else {
    System.out.println("Failed to find " + userId);
}

/exit

Runs with Java 22 - https://jdk.java.net/22/

Example run,

$ jshell worst.jsh

Progress info every 10 games,

Found 10 games. Currently at 2024-01-28

And upon finish, "top" 10 list is shown,

Found 270 games. Currently at 2018-06-13
https://lichess.org/9kI6chE2 - 34% - 2020-04-25
https://lichess.org/PvtBYKg3 - 36% - 2020-04-17
https://lichess.org/nZgxW2YM - 39% - 2023-05-17
https://lichess.org/qdoqT7tO - 40% - 2020-10-29
https://lichess.org/UNeUgd9H - 42% - 2023-10-12
https://lichess.org/ZxP4isRo - 42% - 2020-04-29
https://lichess.org/WoPb2dat - 43% - 2022-11-27
https://lichess.org/qHW9gXhM - 44% - 2020-05-01
https://lichess.org/DPlUpj8t - 46% - 2024-03-28
https://lichess.org/TtWXS34W - 46% - 2019-10-01

Example video of downloading Java and running the script on Windows