Using Bullseye with custom args with System.CommandLine.Experimental

bullseye-custom-args-system.cs

// dotnet add package System.CommandLine.Experimental

using System.CommandLine;
using static Bullseye.Targets;

class Program
{
    static void Main(string[] args)
    {
        var cmd = new RootCommand { TreatUnmatchedTokensAsErrors = false };
        cmd.Add(new Option("--foo", "A value used for something.") { Argument = new Argument<string>("foo") });
        var cmdLine = cmd.Parse(args);

        Target("build", () => System.Console.WriteLine($"foo = {cmdLine.ValueForOption<string>("--foo")}"));

        Target("default", DependsOn("build"));

        RunTargetsAndExit(cmdLine.UnmatchedTokens);
    }
}