dotnet-tool-create-program-cs

dotnet-tool-create-program-cs

using System;
using System.Reflection;

//namespace matches what is in the csproj attributes
namespace SayHowdy
{
    class Program
    {
        static void Main(string[] args)
        {
            //we expect the caller to pass in a simple string on the command line
            //if they don't, then we simply echo back what's expected from them
            if (args.Length == 0)
            {
                var versionString = (Assembly.GetEntryAssembly() ?? throw new InvalidOperationException())
                    .GetCustomAttribute<AssemblyInformationalVersionAttribute>()
                    .InformationalVersion;

                Console.WriteLine($"sayhowdy v{versionString}");
                Console.WriteLine("-------------");
                Console.WriteLine("\nUsage:");
                Console.WriteLine("  sayhowdy <message>");
                return;
            }

            SayHowdy(string.Join(' ', args));
        }

        static void SayHowdy(string message)
        {
            string bot = $"Howdy, {message}";
            Console.WriteLine(bot);
        }
    }
}