flake_env/flake.nix

{
  description = "Yet another flake plugin for direnv";
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-parts = {
      url = "github:hercules-ci/flake-parts";
      inputs.nixpkgs-lib.follows = "nixpkgs";
    };
    pre-commit-hooks = { url = "github:cachix/pre-commit-hooks.nix"; };
    nix-filter = { url = "github:numtide/nix-filter"; };
  };

  outputs =
    inputs @ { flake-parts
    , nix-filter
    , pre-commit-hooks
    , ...
    }:
    flake-parts.lib.mkFlake { inherit inputs; } ({ lib, ... }: {
      systems = [
        "aarch64-linux"
        "x86_64-linux"

        "x86_64-darwin"
        "aarch64-darwin"
      ];
      imports = [ pre-commit-hooks.flakeModule ];
      perSystem =
        { config
        , pkgs
        , self'
        , ...
        }: {
          packages = {
            flake_env = pkgs.ocamlPackages.callPackage ./default.nix {
              inherit nix-filter;
            };
            default = config.packages.flake_env;
          };
          devShells.default = pkgs.mkShell {
            inputsFrom = [ self'.packages.default ];
            packages = builtins.attrValues {
              inherit (pkgs)
                just
                nil
                pre-commit
                ;
              inherit (pkgs.ocamlPackages)
                dune_3
                findlib
                ocaml
                ocaml-lsp
                ocamlformat
                ocamlformat-rpc-lib
                ;
            };
            shellHook = config.pre-commit.installationScript;
          };
          pre-commit = {
            check.enable = true;
            settings.hooks = {
              nixpkgs-fmt.enable = true;
              dune-fmt.enable = true;
            };
          };
        };
      flake = {
        overlays.default = final: _prev: {
          flake_env = final.ocamlPackages.callPackage ./default.nix {
            inherit nix-filter;
          };
        };
      };
    });
}