AddReviewAtComment.java

///usr/bin/env jbang "$0" "$@" ; exit $?

//DEPS info.picocli:picocli:4.6.3
//DEPS org.gitlab4j:gitlab4j-api:6.0.0-rc.8
//JAVA 17

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Properties;
import java.util.concurrent.Callable;

import org.gitlab4j.api.GitLabApi;
import org.gitlab4j.api.models.MergeRequest;
import org.gitlab4j.api.models.User;

import picocli.CommandLine;
import picocli.CommandLine.Command;
import picocli.CommandLine.Option;
import picocli.CommandLine.Parameters;

@Command(name = "AddReviewAtComment", mixinStandardHelpOptions = true, version = "AddReviewAtComment 0.1", description = "Creates a comment in a GitLab MR")
class AddReviewAtComment implements Callable<Integer> {

    private static final String CONFIG_FILE_INITIAL_CONTENT = """
            GITLAB_URL=https://gitlab.com
            GITLAB_AUTH_VALUE=
            """;

    @Parameters(index = "0", description = "The project id or project path")
    private String project;

    @Parameters(index = "1", description = "The MR id")
    private Long mrId;

    @Option(names = { "-c", "--config" }, description = "configuration file location")
    String configFile;

    @Override
    public Integer call() throws Exception {
        Path file;
        if (configFile != null) {
            file = Paths.get(configFile);
        } else {
            file = configFile(Paths.get(""));
        }
        System.out.println("Reading config: " + file.toAbsolutePath());
        Properties p = configProperties(file);
        String gitLabUrl = readProperty(p, "GITLAB_URL", "https://gitlab.com");
        String gitLabAuthValue = readProperty(p, "GITLAB_AUTH_VALUE");

        try (GitLabApi gitLabApi = new GitLabApi(gitLabUrl, gitLabAuthValue)) {
            User user = gitLabApi.getUserApi()
                    .getCurrentUser();

            MergeRequest mr = gitLabApi.getMergeRequestApi()
                    .getMergeRequest(project, mrId);

            String body = "[" + user.getName() + "](" + user.getWebUrl() + ") reviewed the MR ([changes](" + mr.getWebUrl() + "/diffs?start_sha=" + mr.getSha() + ") since then)";
            gitLabApi.getNotesApi()
                    .createMergeRequestNote(project, mrId, body, null, null);

            System.out.println("Comment added on " + mr.getWebUrl());
        }
        return 0;
    }

    public static Properties configProperties(Path configFile) {
        try (InputStream is = new FileInputStream(configFile.toFile())) {
            Properties properties = new Properties();
            properties.load(is);
            return properties;
        } catch (IOException e) {
            throw new IllegalStateException("Can not read config file", e);
        }
    }

    public static Path configFile(Path root) {
        Path configFile = root.toAbsolutePath()
                .resolve("gitlab-config.properties");
        if (!Files.isRegularFile(configFile)) {
            try {
                Files.writeString(configFile, CONFIG_FILE_INITIAL_CONTENT);
                throw new IllegalStateException(String.format("Configuration file '%s' does not exist. An empty configuration file was created", configFile.toAbsolutePath()));
            } catch (IOException e) {
                throw new IllegalStateException("Can not write initial config file", e);
            }
        }
        return configFile;
    }

    public static String readProperty(Properties p, String key) {
        if (!p.containsKey(key)) {
            throw new IllegalStateException(String.format("Configuration file does not contains key '%s'", key));
        }
        String value = p.getProperty(key);
        if (value == null || value.isBlank()) {
            throw new IllegalStateException(String.format("Key '%s' is not defined in configuration file", key));
        }
        return value;
    }

    public static String readProperty(Properties p, String key, String defaultValue) {
        return p.getProperty(key, defaultValue);
    }

    public static void main(String... args) {
        int exitCode = new CommandLine(new AddReviewAtComment()).execute(args);
        System.exit(exitCode);
    }
}