CliFx/CliFx/Services/SystemConsole.cs

using System;
using System.IO;
using System.Threading;

namespace CliFx.Services
{
    /// <summary>
    /// Implementation of <see cref="IConsole"/> that wraps around <see cref="Console"/>.
    /// </summary>
    public class SystemConsole : IConsole
    {
        private readonly CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();

        /// <inheritdoc />
        public SystemConsole()
        {
            // Subscribe to CancelKeyPress event with cancellation token source
            // Kills app on second cancellation (hard cancellation)
            Console.CancelKeyPress += (_, args) =>
            {
                if (_cancellationTokenSource.IsCancellationRequested) 
                    return;
                args.Cancel = true;
                _cancellationTokenSource.Cancel();
            };
        }
        
        /// <inheritdoc />
        public TextReader Input => Console.In;

        /// <inheritdoc />
        public bool IsInputRedirected => Console.IsInputRedirected;

        /// <inheritdoc />
        public TextWriter Output => Console.Out;

        /// <inheritdoc />
        public bool IsOutputRedirected => Console.IsOutputRedirected;

        /// <inheritdoc />
        public TextWriter Error => Console.Error;

        /// <inheritdoc />
        public bool IsErrorRedirected => Console.IsErrorRedirected;

        /// <inheritdoc />
        public ConsoleColor ForegroundColor
        {
            get => Console.ForegroundColor;
            set => Console.ForegroundColor = value;
        }

        /// <inheritdoc />
        public ConsoleColor BackgroundColor
        {
            get => Console.BackgroundColor;
            set => Console.BackgroundColor = value;
        }

        /// <inheritdoc />
        public void ResetColor() => Console.ResetColor();

        /// <inheritdoc />
        public CancellationToken CancellationToken => _cancellationTokenSource.Token;
    }
}