`settings.global.on-unmatched` does not match up with `treefmt` behaviour

[PigeonF]

Describe the bug

As far as I can tell treefmt ignores the generated global.on-unmatched setting in the generated config file.

To Reproduce

1. Create a new treefmt-nix configuration

# flake.nix
{
  inputs.treefmt-nix.url = "github:numtide/treefmt-nix";

  outputs =
    {
      self,
      nixpkgs,
      systems,
      treefmt-nix,
    }:
    let
      # Small tool to iterate over each systems
      eachSystem = f: nixpkgs.lib.genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});

      # Eval the treefmt modules from ./treefmt.nix
      treefmtEval = eachSystem (
        pkgs:
        treefmt-nix.lib.evalModule pkgs {
          projectRootFile = "flake.nix";
          settings.global.on-unmatched = "debug";
        }
      );
    in
    {
      formatter = eachSystem (pkgs: treefmtEval.${pkgs.system}.config.build.wrapper);
    };
}

2. Run nix fmt

$ nix fmt
2025/01/08 11:31:28 INFO using config file: /nix/store/5gvl2dmgcz24kkz81lqr3sd1bc041vjv-treefmt.toml
WARN no formatter for path: flake.nix
traversed 2 files
emitted 0 files for processing
formatted 0 files (0 changed) in 107ms
$ cat /nix/store/5gvl2dmgcz24kkz81lqr3sd1bc041vjv-treefmt.toml
[formatter]

[global]
excludes = ["*.lock", "*.patch", "package-lock.json", "go.mod", "go.sum", ".gitignore", ".gitmodules", ".hgignore", ".svnignore"]
on-unmatched = "debug"

As you can see the setting is written successfully to the config file, but treefmt does not seem to read global.on-unmatched

3. Removing the global prefix fixes the configuration (but this does not match up with the module-options.nix)

treefmt-nix.lib.evalModule pkgs {
  projectRootFile = "flake.nix";
  # NOTE: settings.on-unmatched without the global
  settings.on-unmatched = "debug";
}

$ nix fmt
2025/01/08 11:34:35 INFO using config file: /nix/store/8zn08cfwxxb2253zg9qzvrbmbhggkbn7-treefmt.toml
traversed 2 files
emitted 0 files for processing
formatted 0 files (0 changed) in 139ms
$ cat /nix/store/8zn08cfwxxb2253zg9qzvrbmbhggkbn7-treefmt.toml
on-unmatched = "debug"
[formatter]

[global]
excludes = ["*.lock", "*.patch", "package-lock.json", "go.mod", "go.sum", ".gitignore", ".gitmodules", ".hgignore", ".svnignore"]
on-unmatched = "warn"

Expected behavior

Either treefmt should read the global.on-unmatched config setting, or treefmt-nix should change the module-options.nix to remove the global settings prefix for on-unmatched.

System information

I am using commit 13c913f5deb3a5c08bb810efd89dc8cb24dd968b, on NixOS 24.11.

[brianmcgee]

In recent versions, the global section has been deprecated.

global.excludes is supported for backwards compatibility, but all other settings should go at the root.

https://treefmt.com/latest/getting-started/configure.

[zimbatm]

Ok that might be solved by #268 then

[brianmcgee]

I just created #298 as well