flake.nix

{
  description = "A basic flake with a shell";
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-parts.url = "github:hercules-ci/flake-parts";
    treefmt-nix.url = "github:numtide/treefmt-nix";
  };

  outputs =
    inputs@{ flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      imports = [ inputs.treefmt-nix.flakeModule ];

      systems = [ "x86_64-linux" ];

      perSystem =
        { pkgs, ... }:
        {
          devShells.default = pkgs.mkShell {
            packages = with pkgs; [
              jdk21
              jdt-language-server
              maven
              gradle
              git-cliff
            ];
          };

          treefmt = {
            programs = {
              actionlint.enable = true;
              nixfmt.enable = true;
            };
            flakeCheck = true;
          };
        };
    };
}