public KernelApplication AddKernelCommand()

in src/KernelApplication.cs [254:294]
36 lines of code
3 McCabe index (conditional complexity)

        public KernelApplication AddKernelCommand(Action<CommandLineApplication>? configure = null)
        {
            var kernelCmd = this.Command(
                "kernel",
                cmd =>
                {
                    var logEnvVarName = $"{properties.KernelName.ToUpperInvariant()}_LOG_LEVEL";
                    cmd.HelpOption();
                    cmd.Description = $"Runs the {properties.FriendlyName} kernel. Typically only run by a Jupyter client.";
                    var connectionFileArg = cmd.Argument(
                        "connection-file", "Connection file used to connect to a Jupyter client."
                    );
                    var logLevelOpt = cmd.Option<LogLevel>(
                        "-l|--log-level <LEVEL>",
                        "Level of logging messages to emit to the console. Defaults to Error." +
                        $"Can also be set with the {logEnvVarName} environment variable.",
                        CommandOptionType.SingleValue
                    );
                    cmd.OnExecute(() =>
                    {
                        var connectionFile = connectionFileArg.Value;
                        // Check if there is an environment variable set that
                        // overrides logging level, then check the command line
                        // option, and finally fall back to a reasonable default.
                        var logLevelFromEnv =
                            System.Environment.GetEnvironmentVariable(logEnvVarName);
                        var logLevel =
                            logLevelFromEnv == null
                            ? logLevelOpt.HasValue()
                               ? logLevelOpt.ParsedValue
                               : LogLevel.Error
                            : (LogLevel)Enum.Parse(typeof(LogLevel), logLevelFromEnv);

                        return ReturnExitCode(() => Run(connectionFile, logLevel));
                    });
                }
            );
            configure?.Invoke(kernelCmd);

            return this;
        }