gui-cs.Terminal.Gui/Terminal.Gui/ConsoleDrivers/AnsiEscapeSequenceRequest.cs

#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>
    ///     Request to send e.g. see
    ///     <see>
    ///         <cref>EscSeqUtils.CSI_SendDeviceAttributes.Request</cref>
    ///     </see>
    /// </summary>
    public required string Request { get; init; }

    // BUGBUG: Nullable issue
    /// <summary>
    ///     Invoked when the console responds with an ANSI response code that matches the
    ///     <see cref="Terminator"/>
    /// </summary>
    public Action<string> ResponseReceived;

    /// <summary>
    ///     Invoked if the console fails to responds to the ANSI response code
    /// </summary>
    public Action? Abandoned;

    /// <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>
    ///     Sends the <see cref="Request"/> to the raw output stream of the current <see cref="ConsoleDriver"/>.
    ///     Only call this method from the main UI thread. You should use <see cref="AnsiRequestScheduler"/> if
    ///     sending many requests.
    /// </summary>
    public void Send () { Application.Driver?.WriteRaw (Request); }


    /// <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; }
}