Options.cs

using System;

namespace DisplayNudger;

// --------- PowerShell-friendly argument parsing ----------
public class Options
{
    public string DisplaySelector = "1"; // default to display 1
    public int? Width, Height, Hz, Bits, DelaySeconds;
    public bool ListOnly, ShowHelp;

    public static Options Parse(string[] a)
    {
        var o = new Options();
        for (int i = 0; i < a.Length; i++)
        {
            var k = a[i].Trim().ToLowerInvariant();
            string Next() => (i + 1 < a.Length) ? a[++i] : throw new ArgumentException($"Missing value after {k}");

            switch (k)
            {
                case "-display":
                case "-d": o.DisplaySelector = Next(); break;
                case "-width":
                case "-w": o.Width = int.Parse(Next()); break;
                case "-height":
                case "-h": o.Height = int.Parse(Next()); break;
                case "-hz":
                case "-r": o.Hz = int.Parse(Next()); break;
                case "-bpp":
                case "-bits": o.Bits = int.Parse(Next()); break;
                case "-wait":
                case "-delay": o.DelaySeconds = int.Parse(Next()); break;
                case "-list":
                case "--list": o.ListOnly = true; break;
                case "-?":
                case "--help":
                case "-help": o.ShowHelp = true; break;
                default: throw new ArgumentException($"Unknown option: {k}");
            }
        }
        return o;
    }

    public static void PrintHelpToConsole()
    {
        Console.WriteLine(@"
DisplayNudger - set resolution/refresh on a specific display.

Usage:
  DisplayNudger -display <index|\\.\DISPLAYx|name-substring> [-w 3840 -h 2160] -hz 120
  DisplayNudger -display 1 -hz 120
  DisplayNudger -display G80SD -w 3440 -h 1440 -hz 120
  DisplayNudger -display 2 -list

Options:
  -display, -d   Target display by index (1-based), \\.\DISPLAYx, or name substring (e.g., G80SD)
  -width, -w     Width in pixels
  -height, -h    Height in pixels
  -hz, -r        Refresh rate (e.g., 120)
  -bpp, -bits    Bits per pixel (optional; usually leave unset)
  -list          List available modes for that display
  -help          Show this help
");
    }
}