void logging()

in daemon-m40/src/main/java/org/apache/maven/cli/DaemonMavenCli.java [411:475]
50 lines of code
16 McCabe index (conditional complexity)

    void logging(CliRequest cliRequest) {
        // 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);

        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 COLOR
        String styleColor = cliRequest.getUserProperties().getProperty(STYLE_COLOR_PROPERTY, "auto");
        if ("always".equals(styleColor)) {
            MessageUtils.setColorEnabled(true);
        } else if ("never".equals(styleColor)) {
            MessageUtils.setColorEnabled(false);
        } else if (!"auto".equals(styleColor)) {
            throw new IllegalArgumentException("Invalid color configuration option [" + styleColor
                    + "]. Supported values are (auto|always|never).");
        } else {
            boolean isBatchMode = !commandLine.hasOption(FORCE_INTERACTIVE)
                    && (commandLine.hasOption(BATCH_MODE) || commandLine.hasOption(NON_INTERACTIVE));
            if (isBatchMode || commandLine.hasOption(CLIManager.LOG_FILE)) {
                MessageUtils.setColorEnabled(false);
            }
        }

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

            // redirect stdout and stderr to file
            try {
                PrintStream ps = new PrintStream(new FileOutputStream(logFile), true);
                System.setOut(ps);
                System.setErr(ps);
            } catch (FileNotFoundException e) {
                //
                // Ignore
                //
            }
        } else if (!Environment.MVND_RAW_STREAMS
                .asOptional()
                .map(Boolean::parseBoolean)
                .orElse(Boolean.FALSE)) {
            MvndSimpleLogger stdout = (MvndSimpleLogger) slf4jLoggerFactory.getLogger("stdout");
            MvndSimpleLogger stderr = (MvndSimpleLogger) slf4jLoggerFactory.getLogger("stderr");
            stdout.setLogLevel(LocationAwareLogger.INFO_INT);
            stderr.setLogLevel(LocationAwareLogger.INFO_INT);
            System.setOut(new LoggingOutputStream(s -> stdout.info("[stdout] " + s)).printStream());
            System.setErr(new LoggingOutputStream(s -> stderr.warn("[stderr] " + s)).printStream());
        }

        slf4jConfiguration.activate();
    }