void logging()

in compat/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java [477:594]
98 lines of code
33 McCabe index (conditional complexity)

    void logging(CliRequest cliRequest) throws ExitException {
        // LOG LEVEL
        CommandLine commandLine = cliRequest.commandLine;
        cliRequest.verbose = commandLine.hasOption(CLIManager.VERBOSE) || commandLine.hasOption(CLIManager.DEBUG);
        cliRequest.quiet = !cliRequest.verbose && commandLine.hasOption(CLIManager.QUIET);
        cliRequest.showErrors = cliRequest.verbose || commandLine.hasOption(CLIManager.ERRORS);

        // LOG COLOR
        String styleColor = cliRequest.getUserProperties().getProperty("style.color", "auto");
        styleColor = cliRequest.getUserProperties().getProperty(Constants.MAVEN_STYLE_COLOR_PROPERTY, styleColor);
        styleColor = commandLine.getOptionValue(CLIManager.COLOR, styleColor);
        if ("always".equals(styleColor) || "yes".equals(styleColor) || "force".equals(styleColor)) {
            MessageUtils.setColorEnabled(true);
        } else if ("never".equals(styleColor) || "no".equals(styleColor) || "none".equals(styleColor)) {
            MessageUtils.setColorEnabled(false);
        } else if (!"auto".equals(styleColor) && !"tty".equals(styleColor) && !"if-tty".equals(styleColor)) {
            throw new IllegalArgumentException(
                    "Invalid color configuration value '" + styleColor + "'. Supported are 'auto', 'always', 'never'.");
        } else {
            boolean isBatchMode = !commandLine.hasOption(CLIManager.FORCE_INTERACTIVE)
                    && (commandLine.hasOption(CLIManager.BATCH_MODE)
                            || commandLine.hasOption(CLIManager.NON_INTERACTIVE));
            if (isBatchMode || commandLine.hasOption(CLIManager.LOG_FILE)) {
                MessageUtils.setColorEnabled(false);
            }
        }

        slf4jLoggerFactory = LoggerFactory.getILoggerFactory();
        Slf4jConfiguration slf4jConfiguration = Slf4jConfigurationFactory.getConfiguration(slf4jLoggerFactory);

        if (cliRequest.verbose) {
            cliRequest.request.setLoggingLevel(MavenExecutionRequest.LOGGING_LEVEL_DEBUG);
            slf4jConfiguration.setRootLoggerLevel(Slf4jConfiguration.Level.DEBUG);
        } else if (cliRequest.quiet) {
            cliRequest.request.setLoggingLevel(MavenExecutionRequest.LOGGING_LEVEL_ERROR);
            slf4jConfiguration.setRootLoggerLevel(Slf4jConfiguration.Level.ERROR);
        }
        // else fall back to default log level specified in conf
        // see https://issues.apache.org/jira/browse/MNG-2570

        // LOG STREAMS
        if (commandLine.hasOption(CLIManager.LOG_FILE)) {
            File logFile = new File(commandLine.getOptionValue(CLIManager.LOG_FILE));
            logFile = ResolveFile.resolveFile(logFile, cliRequest.workingDirectory);

            // redirect stdout and stderr to file
            try {
                PrintStream ps = new PrintStream(new FileOutputStream(logFile));
                System.setOut(ps);
                System.setErr(ps);
            } catch (FileNotFoundException e) {
                //
                // Ignore
                //
            }
        }

        slf4jConfiguration.activate();

        plexusLoggerManager = new Slf4jLoggerManager();
        slf4jLogger = slf4jLoggerFactory.getLogger(this.getClass().getName());

        if (commandLine.hasOption(CLIManager.FAIL_ON_SEVERITY)) {
            String logLevelThreshold = commandLine.getOptionValue(CLIManager.FAIL_ON_SEVERITY);

            if (slf4jLoggerFactory instanceof LogLevelRecorder recorder) {
                LogLevelRecorder.Level level =
                        switch (logLevelThreshold.toLowerCase(Locale.ENGLISH)) {
                            case "warn", "warning" -> LogLevelRecorder.Level.WARN;
                            case "error" -> LogLevelRecorder.Level.ERROR;
                            default -> throw new IllegalArgumentException(
                                    logLevelThreshold
                                            + " is not a valid log severity threshold. Valid severities are WARN/WARNING and ERROR.");
                        };
                recorder.setMaxLevelAllowed(level);
                slf4jLogger.info("Enabled to break the build on log level {}.", logLevelThreshold);
            } else {
                slf4jLogger.warn(
                        "Expected LoggerFactory to be of type '{}', but found '{}' instead. "
                                + "The --fail-on-severity flag will not take effect.",
                        LogLevelRecorder.class.getName(),
                        slf4jLoggerFactory.getClass().getName());
            }
        }

        // check for presence of deprecated options and print warning
        boolean fail = false;
        for (Option option : cliRequest.commandLine.getOptions()) {
            if (option.isDeprecated()) {
                StringBuilder sb = new StringBuilder();
                sb.append("The option -").append(option.getOpt());
                if (option.getLongOpt() != null) {
                    sb.append(",--").append(option.getLongOpt());
                }
                sb.append(" is deprecated ");
                if (option.getDeprecated().isForRemoval()) {
                    sb.append("and will be removed in a future version");
                }
                if (option.getDeprecated().getSince() != null) {
                    sb.append("since Maven ").append(option.getDeprecated().getSince());
                }
                boolean error = false;
                if (option.getDeprecated().getDescription() != null) {
                    sb.append(": ").append(option.getDeprecated().getDescription());
                    error = option.getDeprecated().getDescription().startsWith("UNSUPPORTED:");
                }
                if (error) {
                    slf4jLogger.error(sb.toString());
                    fail = true;
                } else {
                    slf4jLogger.warn(sb.toString());
                }
            }
        }
        if (fail) {
            throw new ExitException(1);
        }
    }