How to debug mapperly in Visual Studio 2022?

[ycherkes]

Hi, I've cloned mapperly, created one more Console project, added two project references:

<ItemGroup>
    <ProjectReference Include="..\Riok.Mapperly.Abstractions\Riok.Mapperly.Abstractions.csproj" />
    <ProjectReference Include="..\Riok.Mapperly\Riok.Mapperly.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
</ItemGroup>

After these manipulations, mapperly generates all the mappers, but I can't start debugging mapperly.
I've tried: https://github.com/JoanComasFdz/dotnet-how-to-debug-source-generator-vs2022 and dotnet/roslyn-sdk#850 with no success.

Could you help me?

[latonz]

Note the compilation and therefore the execution of the source generator happens in a different process, before the command line application runs.

Mapperly uses a compile constant DEBUG_SOURCE_GENERATOR to determine whether to attach a debugger. If it is set, it tries to attach a debugger (it uses Debugger.Launch() on windows, on macos it tries to launch jetbrains rider) and waits for the connection of the debugger (up to 30seconds). If the automatic debugger attachment fails (eg. if rider can't be found on macos, you use linux, ...) you can use these 30 seconds to attach your debugger manually (for vs 2022 see attach to running processes). You can use the DefineConstants dontet build or csproj parameter to define the DEBUG_SOURCE_GENERATOR constant or temporary comment the conditional attribute on DebuggerUtil.AttachDebugger.

[ycherkes]

Thanks a lot.
First - as I have Console app targeted to .net6, I saw errors: "An instance of analyzer cannot be created".
It's fixed by adding SetTargetFramework attribute to the target console project file:

<ProjectReference Include="..\Riok.Mapperly\Riok.Mapperly.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" SetTargetFramework="TargetFramework=netstandard2.0"/>

The solution was found on stackoverflow

Second - I've defined a DEBUG_SOURCE_GENERATOR debug constant in a Riok.Mapperly project file as you said.
As result, I'm able to debug the mapperly.

[MirzaMerdovic]

Hi,

Thanks for the info here! but it might be good to add this as a part of readme or the official documentation.

[latonz]

I created #231 to track this.