Interactive display for terminals

src/Platform/Microsoft.Testing.Platform/Helpers/System/IConsole.cs

@@ -10,6 +10,12 @@ internal interface IConsole
 {
     event ConsoleCancelEventHandler? CancelKeyPress;
 
+    public int BufferHeight { get; }
+
+    public int BufferWidth { get; }
+
+    public bool IsOutputRedirected { get; }
+
     void SetForegroundColor(ConsoleColor color);
 
     void SetBackgroundColor(ConsoleColor color);
@@ -36,5 +42,7 @@ internal interface IConsole
 
     void Write(string? value);
 
+    void Write(char value);
+
     void Clear();
 }

src/Platform/Microsoft.Testing.Platform/Helpers/System/SystemConsole.cs

@@ -11,6 +11,22 @@ internal sealed class SystemConsole : IConsole
 {
     private const int WriteBufferSize = 256;
     private static readonly StreamWriter CaptureConsoleOutWriter;
+
+    /// <summary>
+    /// Gets the height of the buffer area.
+    /// </summary>
+    public int BufferHeight => Console.BufferHeight;
+
+    /// <summary>
+    /// Gets the width of the buffer area.
+    /// </summary>
+    public int BufferWidth => Console.BufferWidth;
+
+    /// <summary>
+    /// Gets a value indicating whether output has been redirected from the standard output stream.
+    /// </summary>
+    public bool IsOutputRedirected => Console.IsOutputRedirected;
+
     private bool _suppressOutput;
 
     static SystemConsole()
@@ -134,6 +150,14 @@ public void Write(string? value)
         }
     }
 
+    public void Write(char value)
+    {
+        if (!_suppressOutput)
+        {
+            CaptureConsoleOutWriter.Write(value);
+        }
+    }
+
     public void SetForegroundColor(ConsoleColor color)
     {
 #if NET8_0_OR_GREATER

src/Platform/Microsoft.Testing.Platform/Hosts/TestHostBuilder.cs

@@ -344,6 +344,7 @@ await LogTestHostCreatedAsync(
             TestHostControllerConfiguration testHostControllers = await ((TestHostControllersManager)TestHostControllers).BuildAsync(testHostControllersServiceProvider);
             if (testHostControllers.RequireProcessRestart)
             {
+                testHostControllerInfo.CurrentProcessIsTestHostController = true;
                 TestHostControllersTestHost testHostControllersTestHost = new(testHostControllers, testHostControllersServiceProvider, systemEnvironment, loggerFactory, systemClock, dotnetTestPipeClient);
 
                 await LogTestHostCreatedAsync(
@@ -364,6 +365,8 @@ await LogTestHostCreatedAsync(
         ApplicationStateGuard.Ensure(currentWorkingDirectory is not null);
         configuration.SetTestHostWorkingDirectory(currentWorkingDirectory);
 
+        testHostControllerInfo.CurrentProcessIsTestHostController = false;
+
         // If we're under test controllers and currently we're inside the started test host we connect to the out of process
         // test controller manager.
         NamedPipeClient? testControllerConnection = await ConnectToTestHostProcessMonitorIfAvailableAsync(

src/Platform/Microsoft.Testing.Platform/OutputDevice/Console/AnsiCodes.cs

@@ -0,0 +1,144 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace Microsoft.Testing.Platform.OutputDevice.Console;
+
+/// <summary>
+/// A collection of standard ANSI/VT100 control codes.
+/// </summary>
+internal static class AnsiCodes
+{
+    /// <summary>
+    ///  Escape character.
+    /// </summary>
+    public const string Esc = "\x1b";
+
+    /// <summary>
+    /// The control sequence introducer.
+    /// </summary>
+    public const string CSI = "\x1b[";
+
+    /// <summary>
+    /// Select graphic rendition.
+    /// </summary>
+    /// <remarks>
+    /// Print <see cref="CSI"/>color-code<see cref="SetColor"/> to change text color.
+    /// </remarks>
+    public const string SetColor = ";1m";
+
+    /// <summary>
+    /// Select graphic rendition - set bold mode.
+    /// </summary>
+    /// <remarks>
+    /// Print <see cref="CSI"/><see cref="SetBold"/> to change text to bold.
+    /// </remarks>
+    public const string SetBold = "1m";
+
+    /// <summary>
+    /// A shortcut to reset color back to normal.
+    /// </summary>
+    public const string SetDefaultColor = CSI + "m";
+
+    /// <summary>
+    /// Non-xterm extension to render a hyperlink.
+    /// </summary>
+    /// <remarks>
+    /// Print <see cref="LinkPrefix"/>url<see cref="LinkInfix"/>text<see cref="LinkSuffix"/> to render a hyperlink.
+    /// </remarks>
+    public const string LinkPrefix = "\x1b]8;;";
+
+    /// <summary>
+    /// <see cref="LinkPrefix"/>.
+    /// </summary>
+    public const string LinkInfix = "\x1b\\";
+
+    /// <summary>
+    /// <see cref="LinkPrefix"/>.
+    /// </summary>
+    public const string LinkSuffix = "\x1b]8;;\x1b\\";
+
+    /// <summary>
+    /// Moves up the specified number of lines and puts cursor at the beginning of the line.
+    /// </summary>
+    /// <remarks>
+    /// Print <see cref="CSI"/>N<see cref="MoveUpToLineStart"/> to move N lines up.
+    /// </remarks>
+    public const string MoveUpToLineStart = "F";
+
+    /// <summary>
+    /// Moves forward (to the right) the specified number of characters.
+    /// </summary>
+    /// <remarks>
+    /// Print <see cref="CSI"/>N<see cref="MoveForward"/> to move N characters forward.
+    /// </remarks>
+    public const string MoveForward = "C";
+
+    /// <summary>
+    /// Moves backward (to the left) the specified number of characters.
+    /// </summary>
+    /// <remarks>
+    /// Print <see cref="CSI"/>N<see cref="MoveBackward"/> to move N characters backward.
+    /// </remarks>
+    public const string MoveBackward = "D";
+
+    /// <summary>
+    /// Clears everything from cursor to end of screen.
+    /// </summary>
+    /// <remarks>
+    /// Print <see cref="CSI"/><see cref="EraseInDisplay"/> to clear.
+    /// </remarks>
+    public const string EraseInDisplay = "J";
+
+    /// <summary>
+    /// Clears everything from cursor to the end of the current line.
+    /// </summary>
+    /// <remarks>
+    /// Print <see cref="CSI"/><see cref="EraseInLine"/> to clear.
+    /// </remarks>
+    public const string EraseInLine = "K";
+
+    /// <summary>
+    /// Hides the cursor.
+    /// </summary>
+    public const string HideCursor = "\x1b[?25l";
+
+    /// <summary>
+    /// Shows/restores the cursor.
+    /// </summary>
+    public const string ShowCursor = "\x1b[?25h";
+
+    /// <summary>
+    /// Set progress state to a busy spinner. <br/>
+    /// Note: this code works only on ConEmu terminals, and conflicts with push a notification code on iTerm2.
+    /// </summary>
+    /// <remarks>
+    /// <see href="https://conemu.github.io/en/AnsiEscapeCodes.html#ConEmu_specific_OSC">ConEmu specific OSC codes.</see><br/>
+    /// <see href="https://iterm2.com/documentation-escape-codes.html">iTerm2 proprietary escape codes.</see>
+    /// </remarks>
+    public const string SetBusySpinner = "\x1b]9;4;3;\x1b\\";
+
+    /// <summary>
+    /// Remove progress state, restoring taskbar status to normal. <br/>
+    /// Note: this code works only on ConEmu terminals, and conflicts with push a notification code on iTerm2.
+    /// </summary>
+    /// <remarks>
+    /// <see href="https://conemu.github.io/en/AnsiEscapeCodes.html#ConEmu_specific_OSC">ConEmu specific OSC codes.</see><br/>
+    /// <see href="https://iterm2.com/documentation-escape-codes.html">iTerm2 proprietary escape codes.</see>
+    /// </remarks>
+    public const string RemoveBusySpinner = "\x1b]9;4;0;\x1b\\";
+
+    public static string Colorize(string? s, TerminalColor color)
+        => RoslynString.IsNullOrWhiteSpace(s) ? s ?? string.Empty : $"{CSI}{(int)color}{SetColor}{s}{SetDefaultColor}";
+
+    public static string MakeBold(string? s)
+        => RoslynString.IsNullOrWhiteSpace(s) ? s ?? string.Empty : $"{CSI}{SetBold}{s}{SetDefaultColor}";
+
+    public static string MoveCursorBackward(int count) => $"{CSI}{count}{MoveBackward}";
+
+    /// <summary>
+    /// Moves cursor to the specified column, or the rightmost column if <paramref name="column"/> is greater than the width of the terminal.
+    /// </summary>
+    /// <param name="column">Column index.</param>
+    /// <returns>Control codes to set the desired position.</returns>
+    public static string SetCursorHorizontal(int column) => $"{CSI}{column}G";
+}

src/Platform/Microsoft.Testing.Platform/OutputDevice/Console/AnsiDetector.cs

@@ -0,0 +1,40 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+// Portions of the code in this file were ported from the spectre.console by Patrik Svensson, Phil Scott, Nils Andresen
+// https://github.com/spectreconsole/spectre.console/blob/main/src/Spectre.Console/Internal/Backends/Ansi/AnsiDetector.cs
+// and from the supports-ansi project by Qingrong Ke
+// https://github.com/keqingrong/supports-ansi/blob/master/index.js
+using System.Text.RegularExpressions;
+
+namespace Microsoft.Testing.Platform.OutputDevice.Console;
+
+/// <summary>
+/// Works together with the <see cref="NativeMethods"/> to figure out if the current console is capable of using ANSI output codes.
+/// </summary>
+internal class AnsiDetector
+{
+    private static readonly Regex[] TerminalsRegexes =
+    {
+        new("^xterm"), // xterm, PuTTY, Mintty
+        new("^rxvt"), // RXVT
+        new("^(?!eterm-color).*eterm.*"), // Accepts eterm, but not eterm-color, which does not support moving the cursor, see #9950.
+        new("^screen"), // GNU screen, tmux
+        new("tmux"), // tmux
+        new("^vt100"), // DEC VT series
+        new("^vt102"), // DEC VT series
+        new("^vt220"), // DEC VT series
+        new("^vt320"), // DEC VT series
+        new("ansi"), // ANSI
+        new("scoansi"), // SCO ANSI
+        new("cygwin"), // Cygwin, MinGW
+        new("linux"), // Linux console
+        new("konsole"), // Konsole
+        new("bvterm"), // Bitvise SSH Client
+        new("^st-256color"), // Suckless Simple Terminal, st
+        new("alacritty"), // Alacritty
+    };
+
+    public static bool IsAnsiSupported(string? termType)
+        => !RoslynString.IsNullOrEmpty(termType) && TerminalsRegexes.Any(regex => regex.IsMatch(termType));
+}