flake.nix

# SPDX-License-Identifier: Unlicense
{
  inputs = {
    # nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    # systems.url = "github:nix-systems/default";
    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      treefmt-nix,
      ...
    }@inputs:
    let
      eachSystem =
        f:
        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
          system: f system nixpkgs.legacyPackages.${system}
        );

      treefmtEval = eachSystem (_system: pkgs: treefmt-nix.lib.evalModule pkgs ./treefmt.nix);
    in
    {
      packages = eachSystem (
        _system: pkgs: {
          # default = pkgs.hello;
        }
      );

      devShells = eachSystem (
        _system: pkgs: {
          default = pkgs.mkShell (
            with pkgs;
            {
              buildInputs = [
                # Add development dependencies here
              ];
            }
          );
        }
      );

      # Run `nix fmt [FILE_OR_DIR]...` to execute formatters configured in treefmt.nix.
      formatter = eachSystem (system: _pkgs: treefmtEval.${system}.config.build.wrapper);

      checks = eachSystem (
        system: _pkgs: {
          # Throws an error if any of the source files are not correctly formatted
          # when you run `nix flake check --print-build-logs`. Useful for CI
          treefmt = treefmtEval.${system}.config.build.check self;
        }
      );
    };
}