feat: initial project commit

src/Process.Tests.Dummy/Commands/EchoStdinCommand.cs

@@ -0,0 +1,39 @@
+using System.Buffers;
+
+using Spectre.Console.Cli;
+
+namespace Geekeey.Extensions.Process.Tests.Dummy.Commands;
+
+internal sealed class EchoStdinCommand : Command<EchoStdinCommand.Settings>
+{
+	public sealed class Settings : CommandSettings
+	{
+		[CommandOption("--target")] public OutputTarget Target { get; init; } = OutputTarget.StdOut;
+
+		[CommandOption("--length")] public long Length { get; init; } = long.MaxValue;
+	}
+
+	public override int Execute(CommandContext context, Settings settings)
+	{
+		using var buffer = MemoryPool<char>.Shared.Rent(81920);
+
+		var totalBytesRead = 0L;
+		while (totalBytesRead < settings.Length)
+		{
+			var bytesWanted = (int)Math.Min(buffer.Memory.Length, settings.Length - totalBytesRead);
+
+			var bytesRead = Console.In.Read(buffer.Memory.Span[..bytesWanted]);
+			if (bytesRead <= 0)
+				break;
+
+			foreach (var writer in settings.Target.GetWriters())
+			{
+				writer.Write(buffer.Memory.Span[..bytesRead]);
+			}
+
+			totalBytesRead += bytesRead;
+		}
+
+		return 0;
+	}
+}