🐛 Fix long input position commands parsing (#650)

Allow input parsing of `position` commands with up to 500 moves

src/Lynx.Cli/Listener.cs

@@ -1,4 +1,5 @@
 using NLog;
+using System.Text;
 using System.Threading.Channels;
 
 namespace Lynx.Cli;
@@ -23,6 +24,8 @@ public async Task Run(CancellationToken cancellationToken, params string[] args)
                 await _guiInputReader.Writer.WriteAsync(arg, cancellationToken);
             }
 
+            IncreaseInputBufferSize();
+
             while (!cancellationToken.IsCancellationRequested)
             {
                 var input = Console.ReadLine();
@@ -38,4 +41,29 @@ public async Task Run(CancellationToken cancellationToken, params string[] args)
             _logger.Info("Finishing {0}", nameof(Listener));
         }
     }
+
+    /// <summary>
+    /// By default, the method reads input from a 256-character input buffer.
+    /// Because this includes the Environment.NewLine character(s), the method can read lines that contain up to 254 characters.
+    /// To read longer lines, call the OpenStandardInput(Int32) method.
+    /// Source: https://learn.microsoft.com/en-us/dotnet/api/system.console.readline?view=net-8.0
+    /// </summary>
+    private static void IncreaseInputBufferSize()
+    {
+        // Based on Lizard's solution. 4096 * 4 is enough to accept position commands with at least 500 moves
+        Console.SetIn(new StreamReader(Console.OpenStandardInput(), Encoding.UTF8, false, 4096 * 4));
+    }
+
+    /// <summary>
+    /// Something like this would work as well to read input without the input buffer limitation
+    /// </summary>
+    /// <returns></returns>
+    private static string ReadInput()
+    {
+        Span<byte> bytes = stackalloc byte[4096 * 4];
+        Stream inputStream = Console.OpenStandardInput();
+        int outputLength = inputStream.Read(bytes);
+
+        return Encoding.UTF8.GetString(bytes[..outputLength]);
+    }
 }