Create flake.nix

.envrc

@@ -0,0 +1 @@
+eval "$(lorri direnv)"

default.nix

@@ -1,14 +1,3 @@
-{ pkgs ? import <nixpkgs> {} }:
-
-with pkgs;
-stdenv.mkDerivation {
-  name = "nixos-generators";
-  src = lib.cleanSource ./.;
-  meta.description = "Collection of image builders";
-  nativeBuildInputs = [ makeWrapper ];
-  installFlags = [ "PREFIX=$(out)" ];
-  postFixup = ''
-    wrapProgram $out/bin/nixos-generate \
-      --prefix PATH : ${lib.makeBinPath [ jq coreutils findutils nix ] }
-  '';
-}
+(import (builtins.fetchTarball https://github.com/edolstra/flake-compat/archive/master.tar.gz) {
+  src = ./.;
+}).defaultNix.default

flake.lock

@@ -0,0 +1,24 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1603066386,
+        "narHash": "sha256-BpO5yrRi2oqYaOHwWZBoRlLydOeYm0YhuLG4ISsaSzE=",
+        "path": "/nix/store/6mz8x91y5pbndzfcbiwf3ag8k30k6m00-source",
+        "rev": "5265d49a36bb5a18c85e6817b338b456acc3b8cc",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,40 @@
+{
+  description = "nixos-generators - one config, multiple formats";
+
+  outputs = { self, nixpkgs }: let
+    forAllSystems = nixpkgs.lib.genAttrs [ "x86_64-linux" "x86_64-darwin" "i686-linux" "aarch64-linux" ];
+  in {
+    # Packages
+    packages = forAllSystems (system: let
+      pkgs = nixpkgs.legacyPackages."${system}";
+    in {
+      nixos-generators = pkgs.stdenv.mkDerivation {
+        name = "nixos-generators";
+        src = ./.;
+        meta.description = "Collection of image builders";
+        nativeBuildInputs = with pkgs; [ makeWrapper ];
+        installFlags = [ "PREFIX=$(out)" ];
+        postFixup = ''
+          wrapProgram $out/bin/nixos-generate \
+            --prefix PATH : ${pkgs.lib.makeBinPath (with pkgs; [ jq coreutils findutils nix ])}
+        '';
+      };
+    });
+    defaultPackage = forAllSystems (system: self.packages."${system}".nixos-generators);
+
+    devShell = forAllSystems (system: let
+      pkgs = nixpkgs.legacyPackages."${system}";
+    in pkgs.mkShell {
+      buildInputs = with pkgs; [ jq coreutils findutils nix ];
+    });
+
+    # Make it runnable with `nix app`
+    apps = forAllSystems (system: {
+      nixos-generators = {
+        type    = "app";
+        program = "${self.packages."${system}".nixos-generators}/bin/nixos-generators";
+      };
+    });
+    defaultApp = forAllSystems (system: self.apps."${system}".nixos-generators);
+  };
+}

nixos-generate

@@ -1,5 +1,4 @@
-#!/usr/bin/env nix-shell
-#! nix-shell -i bash -p jq
+#!/usr/bin/env bash
 set -euo pipefail
 
 ## Configuration

shell.nix

@@ -0,0 +1,3 @@
+(import (builtins.fetchTarball https://github.com/edolstra/flake-compat/archive/master.tar.gz) {
+  src = ./.;
+}).shellNix.default