Program.cs

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using System;
using CodeGen.generators;
using CommandLine;

namespace CodeGen
{
    internal class Options
    {
        public Options(string lang, string file, int? spaces, bool stdout)
        {
            Lang = lang;
            File = file;
            Spaces = spaces;
            Stdout = stdout;
        }

        [Option('l', "lang", Default = Program.DefaultLang, HelpText = "Languege of output")]
        public string Lang { get; }

//      // Omitting long name, defaults to name of property, ie "--verbose"
//      [Option(Default = false, HelpText = "Prints all messages to standard output.")]
//      public bool Verbose { get; set; }

        [Option('f', "file", Default = "", HelpText = "File or url from which to read data")]
        public string File { get; }

        [Option('s', "spaces", Default = -1, HelpText = "Spaces offset (if not set or negative - using tabs)")]
        public int? Spaces { get; }

        // Set Default to false in production
        [Option('o', "stdout", Default = true, HelpText = "")]
        public bool Stdout { get; }

        public override string ToString()
        {
            return $"{{ -l=\"{Lang}\" -f=\"{File}\" -s={Spaces} {(Stdout ? "-o" : "")}}}";
        }
    }

    internal static class Program
    {
        public const string DefaultLang = "vb";

        public static readonly Package DefaultPkg = GeneratorConf.ExamplePkg;

        public static Options Opts;

        private static void Main(string[] args)
        {
            Parser.Default.ParseArguments<Options>(args)
                .WithParsed(opts => Opts = opts)
                .WithNotParsed(Console.WriteLine);
            try
            {
            #if DEBUG
//              Console.Out.WriteLine("Opts = {0}", Opts);              
            #endif
                var langName = Opts != null ? Opts.Lang : DefaultLang;
                ExecuteConf.Execute(langName, Opts?.File, Opts != null && Opts.Stdout);
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }
    }
}