File-based C# application using docopt.net for CLI parsing

docoptapp.cs

#:package [email protected]
#nullable enable

using DocoptNet;

static int Main(ProgramArguments args)
{
    foreach (var (name, value) in args)
        Console.WriteLine($"{name} = {value}");

    Console.WriteLine($@"{{
    Ship     = {args.CmdShip    },
    New      = {args.CmdNew     },
    Name     = [{string.Join(", ", args.ArgName)}],
    Move     = {args.CmdMove    },
    X        = {args.ArgX       },
    Y        = {args.ArgY       },
    Speed    = {args.OptSpeed   },
    Shoot    = {args.CmdShoot   },
    Mine     = {args.CmdMine    },
    Set      = {args.CmdSet     },
    Remove   = {args.CmdRemove  },
    Moored   = {args.OptMoored  },
    Drifting = {args.OptDrifting},
    Help     = {args.OptHelp    },
    Version  = {args.OptVersion },
}}");

    return 0;
}

static int ShowHelp(string help)
{
    var bin = Path.GetFileName(AppContext.GetData("EntryPointFilePath")?.ToString() // file-based app
                               ?? Environment.ProcessPath // published app
                               ?? ProgramArguments.Bin);
    Console.WriteLine(help.Replace(ProgramArguments.Bin, bin));
    return 0;
}

static int ShowVersion(string version) { Console.WriteLine(version); return 0; }
static int OnError(string usage) { Console.WriteLine(usage); return 1; }

return ProgramArguments.CreateParser()
                       .WithVersion("Naval Fate 2.0")
                       .Parse(args)
                       .Match(Main,
                              result => ShowHelp(result.Help),
                              result => ShowVersion(result.Version),
                              result => OnError(result.Usage));


[DocoptArguments]
partial class ProgramArguments
{
    public const string Bin = "BIN";

    const string Help = $"""
        Naval Fate.

        Usage:
          {Bin} ship new <name>...
          {Bin} ship <name> move <x> <y> [--speed=<kn>]
          {Bin} ship shoot <x> <y>
          {Bin} mine (set|remove) <x> <y> [--moored | --drifting]
          {Bin} (-h | --help)
          {Bin} --version

        Options:
          -h --help     Show this screen.
          --version     Show version.
          --speed=<kn>  Speed in knots [default: 10].
          --moored      Moored (anchored) mine.
          --drifting    Drifting mine.

        """;
}