path: root/Program.cs

using System;
using System.Linq;
using System.Reflection;

namespace aoc2019
{
    internal static class Program
    {
        private static void Main(string[] args)
        {
            var days =
                Assembly.GetExecutingAssembly().GetTypes()
                    .Where(t => t.BaseType == typeof(Day))
                    .Select(t => (Day) Activator.CreateInstance(t))
                    .OrderBy(d => d.DayNumber);

            if (args.Length == 1 && int.TryParse(args[0], out var dayNum))
            {
                var day = days.FirstOrDefault(d => d.DayNumber == dayNum);

                if (day != null)
                    day.AllParts();
                else
                    Console.WriteLine($"{dayNum} invalid or not yet implemented");
            }
            else
            {
                foreach (var d in days) d.AllParts();
            }
        }
    }
}