parts/pkgs: init custom packages

parts/pkgs/default.nix

@@ -0,0 +1,28 @@
+{inputs, ...}: {
+  # NOTE: We use flake-parts' easyOverlay module to extend our default packages with some extra packages I want to have.
+  #
+  imports = [inputs.flake-parts.flakeModules.easyOverlay];
+  perSystem = {
+    config,
+    lib,
+    pkgs,
+    ...
+  }: {
+
+    # Attributes to add to overlays.default.
+    # The overlays.default overlay will re-evaluate perSystem with the “prev” (or “super”) overlay argument value
+    # as the pkgs module argument. The easyOverlay module also adds the final module argument, for the result of applying the overlay.
+
+    # When not in an overlay, final defaults to pkgs plus the generated overlay.
+    # This requires Nixpkgs to be re-evaluated, which is more expensive than setting
+    # pkgs to a Nixpkgs that already includes the necessary overlays that are required
+    # for the flake itself.
+    overlayAttrs = config.extraPackages;
+
+    # https://noogle.dev/f/lib/filesystem/packagesFromDirectoryRecursive
+    extraPackages = lib.packagesFromDirectoryRecursive {
+      inherit (pkgs) callPackage;
+      directory = ./extraPackages;
+    };
+  };
+}