Use flake-parts

flake.nix

@@ -1,32 +1,41 @@
 {
   inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
     nixpkgs-2305.url = "github:NixOS/nixpkgs/nixos-23.05";
-
     nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
-
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
   };
 
   outputs =
-    { nixpkgs, self, ... }@inputs:
-    let
-      system = "x86_64-linux";
-      pkgs = nixpkgs.legacyPackages.${system};
-
-      lib = import ./lib { inherit inputs self; };
-
-      inherit (lib) mkNeovim mkVimPlugin;
-
-      default = mkVimPlugin { inherit system; };
-      neovim = mkNeovim { inherit system; };
-    in
-    {
-      inherit lib;
-
-      formatter.${system} = pkgs.nixfmt-rfc-style;
-
-      packages.${system} = {
-        inherit default neovim;
+    inputs@{ self, flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      flake = {
+        lib = import ./lib { inherit inputs self; };
       };
+
+      systems = [ "x86_64-linux" ];
+
+      perSystem =
+        {
+          config,
+          pkgs,
+          system,
+          ...
+        }:
+        {
+          apps = {
+            nvim = {
+              program = "${config.packages.neovim}/bin/nvim";
+              type = "app";
+            };
+          };
+
+          packages = {
+            default = self.lib.mkVimPlugin { inherit system; };
+            neovim = self.lib.mkNeovim { inherit system; };
+          };
+
+          formatter = pkgs.nixfmt-rfc-style;
+        };
     };
 }