Merge gui-cs#3768 into sixel branch

This work by @BDisp enables us to detect sixel support on demand

Terminal.Gui/ConsoleDrivers/AnsiEscapeSequence/AnsiEscapeSequenceRequest.cs

@@ -0,0 +1,186 @@
+#nullable enable
+namespace Terminal.Gui;
+
+/// <summary>
+///     Describes an ongoing ANSI request sent to the console.
+///     Use <see cref="ResponseReceived"/> to handle the response
+///     when console answers the request.
+/// </summary>
+public class AnsiEscapeSequenceRequest
+{
+    /// <summary>
+    ///     Execute an ANSI escape sequence escape which may return a response or error.
+    /// </summary>
+    /// <param name="ansiRequest">The ANSI escape sequence to request.</param>
+    /// <returns>A <see cref="AnsiEscapeSequenceResponse"/> with the response, error, terminator and value.</returns>
+    public static AnsiEscapeSequenceResponse ExecuteAnsiRequest (AnsiEscapeSequenceRequest ansiRequest)
+    {
+        var response = new StringBuilder ();
+        var error = new StringBuilder ();
+        var savedIsReportingMouseMoves = false;
+        NetDriver? netDriver = null;
+
+        try
+        {
+            switch (Application.Driver)
+            {
+                case NetDriver:
+                    netDriver = Application.Driver as NetDriver;
+                    savedIsReportingMouseMoves = netDriver!.IsReportingMouseMoves;
+
+                    if (savedIsReportingMouseMoves)
+                    {
+                        netDriver.StopReportingMouseMoves ();
+                    }
+
+                    while (Console.KeyAvailable)
+                    {
+                        netDriver._mainLoopDriver._netEvents._waitForStart.Set ();
+                        netDriver._mainLoopDriver._netEvents._waitForStart.Reset ();
+
+                        netDriver._mainLoopDriver._netEvents._forceRead = true;
+                    }
+
+                    netDriver._mainLoopDriver._netEvents._forceRead = false;
+
+                    break;
+                case CursesDriver cursesDriver:
+                    savedIsReportingMouseMoves = cursesDriver.IsReportingMouseMoves;
+
+                    if (savedIsReportingMouseMoves)
+                    {
+                        cursesDriver.StopReportingMouseMoves ();
+                    }
+
+                    break;
+            }
+
+            if (netDriver is { })
+            {
+                NetEvents._suspendRead = true;
+            }
+            else
+            {
+                Thread.Sleep (100); // Allow time for mouse stopping and to flush the input buffer
+
+                // Flush the input buffer to avoid reading stale input
+                while (Console.KeyAvailable)
+                {
+                    Console.ReadKey (true);
+                }
+            }
+
+            // Send the ANSI escape sequence
+            Console.Write (ansiRequest.Request);
+            Console.Out.Flush (); // Ensure the request is sent
+
+            // Read the response from stdin (response should come back as input)
+            Thread.Sleep (100); // Allow time for the terminal to respond
+
+            // Read input until no more characters are available or the terminator is encountered
+            while (Console.KeyAvailable)
+            {
+                // Peek the next key
+                ConsoleKeyInfo keyInfo = Console.ReadKey (true); // true to not display on the console
+
+                // Append the current key to the response
+                response.Append (keyInfo.KeyChar);
+
+                if (keyInfo.KeyChar == ansiRequest.Terminator [^1]) // Check if the key is terminator (ANSI escape sequence ends)
+                {
+                    // Break out of the loop when terminator is found
+                    break;
+                }
+            }
+
+            if (!response.ToString ().EndsWith (ansiRequest.Terminator [^1]))
+            {
+                throw new InvalidOperationException ($"Terminator doesn't ends with: '{ansiRequest.Terminator [^1]}'");
+            }
+        }
+        catch (Exception ex)
+        {
+            error.AppendLine ($"Error executing ANSI request: {ex.Message}");
+        }
+        finally
+        {
+            if (savedIsReportingMouseMoves)
+            {
+                switch (Application.Driver)
+                {
+                    case NetDriver:
+                        NetEvents._suspendRead = false;
+                        netDriver!.StartReportingMouseMoves ();
+
+                        break;
+                    case CursesDriver cursesDriver:
+                        cursesDriver.StartReportingMouseMoves ();
+
+                        break;
+                }
+            }
+        }
+
+        var values = new string? [] { null };
+
+        if (string.IsNullOrEmpty (error.ToString ()))
+        {
+            (string? c1Control, string? code, values, string? terminator) = EscSeqUtils.GetEscapeResult (response.ToString ().ToCharArray ());
+        }
+
+        AnsiEscapeSequenceResponse ansiResponse = new ()
+        {
+            Response = response.ToString (), Error = error.ToString (),
+            Terminator = string.IsNullOrEmpty (response.ToString ()) ? "" : response.ToString () [^1].ToString (), Value = values [0]
+        };
+
+        // Invoke the event if it's subscribed
+        ansiRequest.ResponseReceived?.Invoke (ansiRequest, ansiResponse);
+
+        return ansiResponse;
+    }
+
+    /// <summary>
+    ///     Request to send e.g. see
+    ///     <see>
+    ///         <cref>EscSeqUtils.CSI_SendDeviceAttributes.Request</cref>
+    ///     </see>
+    /// </summary>
+    public required string Request { get; init; }
+
+    /// <summary>
+    ///     Invoked when the console responds with an ANSI response code that matches the
+    ///     <see cref="Terminator"/>
+    /// </summary>
+    public event EventHandler<AnsiEscapeSequenceResponse>? ResponseReceived;
+
+    /// <summary>
+    ///     <para>
+    ///         The terminator that uniquely identifies the type of response as responded
+    ///         by the console. e.g. for
+    ///         <see>
+    ///             <cref>EscSeqUtils.CSI_SendDeviceAttributes.Request</cref>
+    ///         </see>
+    ///         the terminator is
+    ///         <see>
+    ///             <cref>EscSeqUtils.CSI_SendDeviceAttributes.Terminator</cref>
+    ///         </see>
+    ///         .
+    ///     </para>
+    ///     <para>
+    ///         After sending a request, the first response with matching terminator will be matched
+    ///         to the oldest outstanding request.
+    ///     </para>
+    /// </summary>
+    public required string Terminator { get; init; }
+
+    /// <summary>
+    ///     The value expected in the response e.g.
+    ///     <see>
+    ///         <cref>EscSeqUtils.CSI_ReportTerminalSizeInChars.Value</cref>
+    ///     </see>
+    ///     which will have a 't' as terminator but also other different request may return the same terminator with a
+    ///     different value.
+    /// </summary>
+    public string? Value { get; init; }
+}

Terminal.Gui/ConsoleDrivers/AnsiEscapeSequence/AnsiEscapeSequenceResponse.cs

@@ -0,0 +1,53 @@
+#nullable enable
+namespace Terminal.Gui;
+
+/// <summary>
+///     Describes a finished ANSI received from the console.
+/// </summary>
+public class AnsiEscapeSequenceResponse
+{
+    /// <summary>
+    ///     Error received from e.g. see
+    ///     <see>
+    ///         <cref>EscSeqUtils.CSI_SendDeviceAttributes.Request</cref>
+    ///     </see>
+    /// </summary>
+    public required string Error { get; init; }
+
+    /// <summary>
+    ///     Response received from e.g. see
+    ///     <see>
+    ///         <cref>EscSeqUtils.CSI_SendDeviceAttributes.Request</cref>
+    ///     </see>
+    ///     .
+    /// </summary>
+    public required string Response { get; init; }
+
+    /// <summary>
+    ///     <para>
+    ///         The terminator that uniquely identifies the type of response as responded
+    ///         by the console. e.g. for
+    ///         <see>
+    ///             <cref>EscSeqUtils.CSI_SendDeviceAttributes.Request</cref>
+    ///         </see>
+    ///         the terminator is
+    ///         <see>
+    ///             <cref>EscSeqUtils.CSI_SendDeviceAttributes.Terminator</cref>
+    ///         </see>
+    ///     </para>
+    ///     <para>
+    ///         The received terminator must match to the terminator sent by the request.
+    ///     </para>
+    /// </summary>
+    public required string Terminator { get; init; }
+
+    /// <summary>
+    ///     The value expected in the response e.g.
+    ///     <see>
+    ///         <cref>EscSeqUtils.CSI_ReportTerminalSizeInChars.Value</cref>
+    ///     </see>
+    ///     which will have a 't' as terminator but also other different request may return the same terminator with a
+    ///     different value.
+    /// </summary>
+    public string? Value { get; init; }
+}

Terminal.Gui/ConsoleDrivers/CursesDriver/CursesDriver.cs

@@ -177,11 +177,15 @@ public override bool SetCursorVisibility (CursorVisibility visibility)
         return true;
     }
 
+    public bool IsReportingMouseMoves { get; private set; }
+
     public void StartReportingMouseMoves ()
     {
         if (!RunningUnitTests)
         {
             Console.Out.Write (EscSeqUtils.CSI_EnableMouseEvents);
+
+            IsReportingMouseMoves = true;
         }
     }
 
@@ -190,6 +194,8 @@ public void StopReportingMouseMoves ()
         if (!RunningUnitTests)
         {
             Console.Out.Write (EscSeqUtils.CSI_DisableMouseEvents);
+
+            IsReportingMouseMoves = false;
         }
     }
 

Terminal.Gui/ConsoleDrivers/EscSeqUtils/EscSeqUtils.cs

@@ -1316,13 +1316,9 @@ public enum DECSCUSR_Style
     /// <summary>
     ///     ESC [ ? 6 n - Request Cursor Position Report (?) (DECXCPR)
     ///     https://terminalguide.namepad.de/seq/csi_sn__p-6/
+    ///     The terminal reply to <see cref="CSI_RequestCursorPositionReport"/>. ESC [ ? (y) ; (x) ; 1 R
     /// </summary>
-    public static readonly string CSI_RequestCursorPositionReport = CSI + "?6n";
-
-    /// <summary>
-    ///     The terminal reply to <see cref="CSI_RequestCursorPositionReport"/>. ESC [ ? (y) ; (x) R
-    /// </summary>
-    public const string CSI_RequestCursorPositionReport_Terminator = "R";
+    public static readonly AnsiEscapeSequenceRequest CSI_RequestCursorPositionReport = new () { Request = CSI + "?6n", Terminator = "R" };
 
     /// <summary>
     ///     ESC [ 0 c - Send Device Attributes (Primary DA)
@@ -1341,37 +1337,25 @@ public enum DECSCUSR_Style
     ///     28 = Rectangular area operations
     ///     32 = Text macros
     ///     42 = ISO Latin-2 character set
+    ///     The terminator indicating a reply to <see cref="CSI_SendDeviceAttributes"/> or
+    ///     <see cref="CSI_SendDeviceAttributes2"/>
     /// </summary>
-    public static readonly string CSI_SendDeviceAttributes = CSI + "0c";
+    public static readonly AnsiEscapeSequenceRequest CSI_SendDeviceAttributes = new () { Request = CSI + "0c", Terminator = "c" };
 
     /// <summary>
     ///     ESC [ > 0 c - Send Device Attributes (Secondary DA)
     ///     Windows Terminal v1.18+ emits: "\x1b[>0;10;1c" (vt100, firmware version 1.0, vt220)
-    /// </summary>
-    public static readonly string CSI_SendDeviceAttributes2 = CSI + ">0c";
-
-    /// <summary>
     ///     The terminator indicating a reply to <see cref="CSI_SendDeviceAttributes"/> or
     ///     <see cref="CSI_SendDeviceAttributes2"/>
     /// </summary>
-    public const string CSI_ReportDeviceAttributes_Terminator = "c";
+    public static readonly AnsiEscapeSequenceRequest CSI_SendDeviceAttributes2 = new () { Request = CSI + ">0c", Terminator = "c" };
 
     /// <summary>
     ///     CSI 1 8 t  | yes | yes |  yes  | report window size in chars
     ///     https://terminalguide.namepad.de/seq/csi_st-18/
-    /// </summary>
-    public static readonly string CSI_ReportTerminalSizeInChars = CSI + "18t";
-
-    /// <summary>
     ///     The terminator indicating a reply to <see cref="CSI_ReportTerminalSizeInChars"/> : ESC [ 8 ; height ; width t
     /// </summary>
-    public const string CSI_ReportTerminalSizeInChars_Terminator = "t";
-
-    /// <summary>
-    ///     The value of the response to <see cref="CSI_ReportTerminalSizeInChars"/> indicating value 1 and 2 are the terminal
-    ///     size in chars.
-    /// </summary>
-    public const string CSI_ReportTerminalSizeInChars_ResponseValue = "8";
+    public static readonly AnsiEscapeSequenceRequest CSI_ReportTerminalSizeInChars = new () { Request = CSI + "18t", Terminator = "t", Value = "8" };
 
     #endregion
 }