Support for .NET NativeAOT

[bsdayo]

I'm trying to build a command line tool with Spectre.Console.Cli and .NET NativeAOT enabled in .NET 7 (by <PublishAot>true</PublishAot> in csproj). But when I publish this project I get the following warnings:

MSBuild version 17.4.1+9a89d02ff for .NET
  正在确定要还原的项目…
  所有项目均是最新的，无法还原。
  RenameX -> D:\Code\RenameX\RenameX\bin\Release\net7.0\win-x64\renx.dll
  Generating native code
C:\Users\b1acksoil\.nuget\packages\spectre.console.cli\0.46.1-preview.0.6\lib\net7.0\Spectre.Console.Cli.dll
: warning IL2104: Assembly 'Spectre.Console.Cli' produced trim warnings. For more information see https://aka
.ms/dotnet-illink/libraries [D:\Code\RenameX\RenameX\RenameX.csproj]
C:\Users\b1acksoil\.nuget\packages\spectre.console.cli\0.46.1-preview.0.6\lib\net7.0\Spectre.Console.Cli.dll
: warning IL3053: Assembly 'Spectre.Console.Cli' produced AOT analysis warnings. [D:\Code\RenameX\RenameX\Ren
ameX.csproj]
C:\Users\b1acksoil\.nuget\packages\runtime.win-x64.microsoft.dotnet.ilcompiler\7.0.2\framework\System.Private
.Xml.dll : warning IL3053: Assembly 'System.Private.Xml' produced AOT analysis warnings. [D:\Code\RenameX\Ren
ameX\RenameX.csproj]
C:\Users\b1acksoil\.nuget\packages\runtime.win-x64.microsoft.dotnet.ilcompiler\7.0.2\framework\System.Net.Htt
p.dll : warning IL3053: Assembly 'System.Net.Http' produced AOT analysis warnings. [D:\Code\RenameX\RenameX\R
enameX.csproj]
    正在创建库 bin\Release\net7.0\win-x64\native\renx.lib 和对象 bin\Release\net7.0\win-x64\native\renx.exp
  RenameX -> D:\Code\RenameX\RenameX\bin\Release\net7.0\win-x64\publish\

After I run the published exe I get the following error:

Error: Could not find a constructor for 'NekoSpace.RenameX.MainCommand'.

The minimal reproducable program is like this:

using Spectre.Console;
using Spectre.Console.Cli;

var app = new CommandApp<MainCommand>();
return app.Run(args);

public sealed class MainCommand : Command
{
    public override int Execute(CommandContext context)
    {
        AnsiConsole.MarkupLine("[blue]Hello, world![/]");
        return 0;
    }
}

I think it will be amazing if this library could support NativeAOT, for faster startup speed, smaller packaged size, no runtime needed, etc.

[bsdayo]

Not sure if this issue is related to trimming, because I tried to remove <PublishAot> and publish the project with

dotnet publish -c Release -r win-x64 --self-contained -p:PublishTrimmed=true

After running it I got the following error:

Unhandled exception. Spectre.Console.Cli.CommandRuntimeException: Could not get settings type for command of type 'NekoSpace.RenameX.MainCommand'.
   at Spectre.Console.Cli.ConfiguredCommand.FromType[TCommand](String, Boolean ) in /_/src/Spectre.Console.Cli/Internal/Configuration/ConfiguredCommand.cs:line 53
   at Spectre.Console.Cli.Configurator.SetDefaultCommand[TDefaultCommand]() in /_/src/Spectre.Console.Cli/Internal/Configuration/Configurator.cs:line 31
   at Spectre.Console.Cli.CommandApp.SetDefaultCommand[TCommand]() in /_/src/Spectre.Console.Cli/CommandApp.cs:line 48
   at Spectre.Console.Cli.CommandApp`1..ctor(ITypeRegistrar ) in /_/src/Spectre.Console.Cli/CommandAppOfT.cs:line 22
   at Program.<Main>$(String[]) in D:\Code\RenameX\RenameX\Program.cs:line 4

Seems to be the same with this

[TomatoPuddin]

Create a xml file:

<?xml version="1.0" encoding="utf-8" ?>
<linker>
  <assembly fullname="Spectre.Console" preserve="all" />
  <assembly fullname="Spectre.Console.Cli" preserve="all" />
  <assembly fullname="YourAssemblyName" preserve="all" />
</linker>

Add this section to csproj file:

<ItemGroup>
  <TrimmerRootDescriptor Include="path/to/the/xml" />
</ItemGroup>

Then try again.
Reference: Trimming options

[bsdayo]

Thanks, that solved the problem.