playground/flake.nix at main · mccurdyc/playground · GitHub

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{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
    # https://lazamar.co.uk/nix-versions/?package=yarn&version=1.22.19&fullName=yarn-1.22.19&keyName=yarn&revision=336eda0d07dc5e2be1f923990ad9fdb6bc8e28e3&channel=nixpkgs-unstable#instructions
    # nixpkgs-foo.url = "https://github.com/NixOS/nixpkgs/archive/336eda0d07dc5e2be1f923990ad9fdb6bc8e28e3.tar.gz";
    flake-parts.url = "github:hercules-ci/flake-parts";
  };

  outputs = inputs@{ self, nixpkgs, nixpkgs-unstable, flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      flake = { };

      systems = [
        "aarch64-darwin"
        "x86_64-linux"
      ];

      # This is needed for pkgs-unstable - https://github.com/hercules-ci/flake-parts/discussions/105
      imports = [ flake-parts.flakeModules.easyOverlay ];

      perSystem = { system, ... }:
        let
          pkgs = import nixpkgs {
            inherit system;
            config.allowUnfree = true;
          };
          pkgs-unstable = import nixpkgs-unstable {
            inherit system;
            config.allowUnfree = true;
          };
          # pkgs-foo = import nixpkgs-foo {
          #   inherit system;
          #   config.allowUnfree = true;
          # };


          ci_packages = {
            # Nix
            nix-fmt = pkgs.nixpkgs-fmt;

            # General
            inherit (pkgs-unstable) just; # need just >1.33 for working-directory setting
          };

          packages = (builtins.attrValues ci_packages) ++ [
            pkgs.just
            pkgs.statix
            pkgs.nixpkgs-fmt
            pkgs-unstable.nil
            pkgs.hadolint
          ];
        in
        {
          # This is needed for pkgs-unstable - https://github.com/hercules-ci/flake-parts/discussions/105
          overlayAttrs = { inherit pkgs-unstable; };

          formatter = pkgs.nixpkgs-fmt;

          packages = ci_packages;

          devShells.default = pkgs.mkShell {
            inherit packages;
          };
        };
    };
}