// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System;
 
namespace Microsoft.Build.TaskHost;
 
/// <summary>
/// Represents toggleable features of the MSBuild engine.
/// </summary>
internal sealed class Traits
{
    public static Traits Instance { get; } = new Traits();
 
    private Traits()
    {
        EscapeHatches = new EscapeHatches();
 
        DebugEngine = !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("MSBuildDebugEngine"));
        DebugNodeCommunication = DebugEngine || !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("MSBUILDDEBUGCOMM"));
    }
 
    public EscapeHatches EscapeHatches { get; }
 
    public readonly bool DebugEngine;
    public readonly bool DebugNodeCommunication;
}
 
internal sealed class EscapeHatches
{
    /// <summary>
    /// Allow node reuse of TaskHost nodes. This results in task assemblies locked past the build lifetime, preventing them from being rebuilt if custom tasks change, but may improve performance.
    /// </summary>
    public readonly bool ReuseTaskHostNodes = Environment.GetEnvironmentVariable("MSBUILDREUSETASKHOSTNODES") == "1";
 
    /// <summary>
    /// Disable the use of paths longer than Windows MAX_PATH limits (260 characters) when running on a long path enabled OS.
    /// </summary>
    public readonly bool DisableLongPaths = Environment.GetEnvironmentVariable("MSBUILDDISABLELONGPATHS") == "1";
}