chore: faster builds, fzf lua

modules/devshells.nix

@@ -1,10 +1,22 @@
-{ ... }:
+{
+  inputs,
+  lib,
+  ...
+}:
 {
   perSystem =
-    { pkgs, ... }:
+    { pkgs, system, ... }:
     {
       formatter = pkgs.nixfmt-tree;
 
+      packages =
+        {
+          home-manager = inputs.home-manager.packages.${system}.home-manager;
+        }
+        // lib.optionalAttrs (lib.hasSuffix "darwin" system) {
+          darwin-rebuild = inputs.nix-darwin.packages.${system}.darwin-rebuild;
+        };
+
       devShells.default = pkgs.mkShell {
         packages = with pkgs; [
           deadnix

modules/homebrew.nix

@@ -6,7 +6,9 @@
     onActivation = {
       autoUpdate = false;
       upgrade = false;
-      cleanup = "uninstall";
+      # `brew bundle --cleanup` is by far the slowest part of darwin activation
+      # on this machine. Keep switches fast and do cleanup manually when needed.
+      cleanup = "none";
     };
 
     taps = [