Godot-Mono

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Godot-Mono is Godot's game engine supporting C# language for creating both 2D and 3D games.

Installation

Add pkgs.godot-mono (GDScript + C#) to environment.systemPackages.

Export Templates

On Godot upgrade, the new export template version can be automatically provisioned this way:

home.file.".local/share/godot/export_templates/${builtins.replaceStrings [ "-" ] [ "." ] pkgs.godot-mono_4-export-templates.version}".source = pkgs.godot-mono_4-export-templates;

Note: `pkgs.godot-mono_4-export-templates` package is still pending in nixpkgs.

Configuring VSCode Editor for Godot-Mono (C#)

As Godot editor has poor support for C#, VSCode editor is recommended.

Install and configure VSCode as such:

programs.vscode = {
  enable = true;
  package = pkgs.codium;
  profiles.default = {
    "godotTools.lsp.serverPort" = 6005; # port should match your Godot configuration
    "dotnetAcquisitionExtension.sharedExistingDotnetPath" = "${pkgs.dotnet-sdk_8}/bin/dotnet";
    "dotnetAcquisitionExtension.existingDotnetPath" = [
       {
          "extensionId" = "ms-dotnettools.csharp";
          "path" = "${pkgs.dotnet-sdk_8}/bin/dotnet";
       }
       {
          "extensionId" = "ms-dotnettools.csdevkit";
          "path" = "${pkgs.dotnet-sdk_8}/bin/dotnet";
       }
    ];
  extensions = with pkgs.vscode-extensions; [
    geequlim.godot-tools # For Godot GDScript
    ms-dotnettools.csdevkit
    ms-dotnettools.csharp
    ms-dotnettools.vscode-dotnet-runtime
  ];
};

Configure Godot's Editor → Editor Settings menu:

Set Dotnet -> Editor -> External Editor to Visual Studio Code.

Configure Godot 4 for External VSCode Integration

Click Editor [top menu] -> Editor Settings [menu item] -> General [Tab] -> Text Editor [Category] -> External [Sub-Category]:

Exec Path -> Add the output of which codium, on my case would be: /etc/profiles/per-user/REPLACE-USERNAME/bin/codium
Exec Flags -> {project} --goto {file}:{line}:{col}
Use External Editor -> On