redoer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reactive.Linq;
using System.Reactive.Subjects;

namespace KeystrokeRedo
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create an observable sequence of keystrokes from the Console.KeyPress event
            IObservable<string> keystrokes = Observable.FromEvent<ConsoleKeyInfo>(
                handler => Console.KeyPress += handler,
                handler => Console.KeyPress -= handler
            ).Select(key => key.KeyChar.ToString());

            // Create a subject that holds the last 10 keystrokes pressed
            Subject<string> keystrokeBuffer = new Subject<string>();

            // Add keystrokes to the buffer when the button to redo keystrokes is pressed
            keystrokes.Buffer(keystrokes.Where(key => key == "R"))
                .Subscribe(keystrokeList => keystrokeBuffer.OnNext(keystrokeList));

            // Redo the last keystrokes and clear the buffer when the button to redo keystrokes is pressed
            keystrokeBuffer.Do(keystrokeList =>
            {
                foreach (string keystroke in keystrokeList)
                {
                    Console.Write(keystroke);
                }

                Console.WriteLine();
                keystrokeBuffer.OnNext(new List<string>());
            }).Subscribe();

            // Clear the buffer when the button to clear the buffer is pressed
            keystrokes.Where(key => key == "C")
                .Subscribe(_ => keystrokeBuffer.OnNext(new List<string>()));
        }
    }
}

by chatgpt