refactor(lib): add lib output to flake

This is needed so we can use subattributes of flake.lib

nix/flake-parts/lib.nix

@@ -0,0 +1,14 @@
+{ lib, inputs, ... }:
+let
+  inherit (lib.options) mkOption;
+  inherit (lib.types) lazyAttrsOf raw;
+  inherit (inputs.flake-parts.lib) mkSubmoduleOptions;
+in
+{
+  options.flake = mkSubmoduleOptions {
+    lib = mkOption {
+      type = lazyAttrsOf raw;
+      default = { };
+    };
+  };
+}

nix/lib/modules.nix

@@ -4,7 +4,7 @@ let
   inherit (lib.attrsets) mapAttrs;
 in
 {
-  flake.lib = {
+  flake.lib.modules = {
     /**
       Return an attribute set for use with a option that needs to be used for all users.
 

nix/lib/options.nix

@@ -0,0 +1,15 @@
+{ lib, ... }:
+let
+  inherit (lib.options) mkOption;
+  inherit (lib.types) str;
+in
+{
+  flake.lib.options = {
+    mkStrOption =
+      default:
+      mkOption {
+        inherit default;
+        type = str;
+      };
+  };
+}

nix/modules/home-manager.nix

@@ -1,6 +1,6 @@
 { inputs, config, ... }:
 let
-  inherit (cfg.lib) forAllUsers';
+  inherit (cfg.lib.modules) forAllUsers';
   cfg = config.flake;
   hm = inputs.home-manager;
   globalCfg = {

nix/modules/shell.nix

@@ -1,7 +1,7 @@
 { config, lib, ... }:
 let
   cfg = config.flake;
-  inherit (cfg.lib) forAllUsers';
+  inherit (cfg.lib.modules) forAllUsers';
   inherit (lib.attrsets) mapAttrs';
 in
 {

nix/modules/users.nix

@@ -1,7 +1,7 @@
 { config, lib, ... }:
 let
   cfg = config.flake;
-  inherit (cfg.lib) forAllUsers';
+  inherit (cfg.lib.modules) forAllUsers';
   inherit (lib.lists) optional;
 in
 {