ensure lineout does not mix stderr and stdout

src/Proc/BufferedObservableProcess.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Reactive.Disposables;
 using System.Reactive.Linq;
 using System.Threading;
@@ -16,9 +17,7 @@ namespace ProcNet
 	///
 	/// This catches all cases where <see cref="EventBasedObservableProcess"/> would fall short to capture all the process output.
 	///
-#pragma warning disable 1574
-	/// <see cref="CharactersOut"/> contains the current char[] buffer which could be fed to <see cref="Console.Write"/> directly.
-#pragma warning restore 1574
+	/// <see cref="CharactersOut"/> contains the current char[] buffer which could be fed to <see cref="Console.Write(string,object)"/> directly.
 	///
 	/// Note that there is a subclass <use cref="ObservableProcess"/> that allows you to subscribe console output per line
 	/// instead whilst still reading the actual process output using asynchronous stream readers.
@@ -36,11 +35,11 @@ public BufferedObservableProcess(StartArguments startArguments) : base(startArgu
 		private TimeSpan? WaitForStreamReadersTimeout => StartArguments.WaitForStreamReadersTimeout;
 
 		/// <summary>
-		/// Expert level setting: the maximum number of characters to read per itteration. Defaults to 256
+		/// Expert level setting: the maximum number of characters to read per iteration. Defaults to 1024
 		/// </summary>
-		public int BufferSize { get; set; } = 256;
+		public int BufferSize { get; set; } = 1024;
 
-		private CancellationTokenSource _ctx = new CancellationTokenSource();
+		private CancellationTokenSource _ctx = new();
 		private Task _stdOutSubscription;
 		private Task _stdErrSubscription;
 		private IObserver<CharactersOut> _observer;

src/Proc/ObservableProcess.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
@@ -89,11 +90,25 @@ public IDisposable Subscribe(IObserver<LineOut> observerLines, IObserver<Charact
 				.Where(o => o.EndsWithNewLine || o.StartsWithCarriage || BufferBoundary(_bufferStdOutRemainder, _bufferStdErrRemainder));
 			var buffered = published.Buffer(boundaries);
 			var newlines = buffered
-				.Select(c =>
+				.SelectMany(c =>
 				{
-					if (c.Count == 0) return null;
-					var line = new string(c.SelectMany(o => o.Characters).ToArray());
-					return new LineOut(c.First().Error, line.TrimEnd(NewlineChars));
+					if (c == null || c.Count == 0)
+						return Array.Empty<LineOut>();
+					if (c.Count == 1)
+					{
+						var cOut = c.First();
+						var chars = new string(cOut.Characters).TrimEnd(NewlineChars);
+						return new[] { new LineOut(cOut.Error, chars) };
+					}
+
+					return c
+						.GroupBy(l => l.Error)
+						.Select(g => (g.Key, new string(g.SelectMany(o => o.Characters).ToArray())))
+						.SelectMany(kv =>
+							kv.Item2.TrimEnd(NewlineChars).Split(NewlineChars)
+								.Select(line => new LineOut(kv.Key, line.TrimEnd(NewlineChars)))
+						)
+						.ToArray();
 				})
 				.TakeWhile(KeepBufferingLines)
 				.Where(l => l != null)

src/Proc/Proc.Start.cs

@@ -92,7 +92,10 @@ public static ProcessCaptureResult Start(StartArguments arguments, TimeSpan time
 			var consoleOut = new List<LineOut>();
 			composite.Add(process);
 			composite.Add(process.SubscribeLinesAndCharacters(
-					consoleOut.Add,
+					l =>
+					{
+						consoleOut.Add(l);
+					},
 					e => seenException = e,
 					consoleOutWriter.Write,
 					consoleOutWriter.Write

src/Proc/Std/ConsoleOutColorWriter.cs

@@ -1,44 +1,43 @@
 using System;
 
-namespace ProcNet.Std
+namespace ProcNet.Std;
+
+public class ConsoleOutColorWriter : ConsoleOutWriter
 {
-	public class ConsoleOutColorWriter : ConsoleOutWriter
-	{
-		public static ConsoleOutColorWriter Default { get; } = new ConsoleOutColorWriter();
+	public static ConsoleOutColorWriter Default { get; } = new();
 
-		private readonly object _lock = new object();
-		public override void Write(ConsoleOut consoleOut)
+	private readonly object _lock = new();
+	public override void Write(ConsoleOut consoleOut)
+	{
+		lock (_lock)
 		{
-			lock (_lock)
+			Console.ResetColor();
+			if (consoleOut.Error)
 			{
-				if (consoleOut.Error)
-				{
-					Console.ForegroundColor = ConsoleColor.Red;
-					consoleOut.CharsOrString(ErrorCharacters, ErrorLine);
-				}
-				else
-				{
-					Console.ResetColor();
-					consoleOut.CharsOrString(OutCharacters, OutLine);
-				}
-				Console.ResetColor();
+				Console.ForegroundColor = ConsoleColor.Yellow;
+				consoleOut.CharsOrString(ErrorCharacters, ErrorLine);
 			}
+			else
+				consoleOut.CharsOrString(OutCharacters, OutLine);
+
+			Console.ResetColor();
 		}
+	}
 
-		public override void Write(Exception e)
+	public override void Write(Exception e)
+	{
+		if (!(e is CleanExitExceptionBase ee)) throw e;
+		lock (_lock)
 		{
-			if (!(e is CleanExitExceptionBase ee)) throw e;
-			lock (_lock)
+			Console.ResetColor();
+			Console.ForegroundColor = ConsoleColor.Red;
+			Console.Write(e.Message);
+			if (!string.IsNullOrEmpty(ee.HelpText))
 			{
-				Console.ForegroundColor = ConsoleColor.Red;
-				Console.Write(e.Message);
-				if (!string.IsNullOrEmpty(ee.HelpText))
-				{
-					Console.ForegroundColor = ConsoleColor.DarkRed;
-					Console.Write(ee.HelpText);
-				}
-				Console.ResetColor();
+				Console.ForegroundColor = ConsoleColor.DarkRed;
+				Console.Write(ee.HelpText);
 			}
+			Console.ResetColor();
 		}
 	}
 }