refactor: flake.nix

flake.nix

@@ -6,12 +6,13 @@
   };
   outputs = { nixpkgs, fenix, ... }:
     let
-      system = "x86_64-linux";
+      forAllSystems = nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed;
-      pkgs = import nixpkgs { inherit system; };
     in
     {
-      formatter.${system} = pkgs.nixpkgs-fmt;
+      devShells = forAllSystems (system:
-      devShells.${system}.default = pkgs.mkShell {
+        let pkgs = import nixpkgs { inherit system; }; in
+        {
+          default = pkgs.mkShell {
             packages = with pkgs; [
               zsh
               (fenix.packages.${system}.complete.withComponents [
@@ -23,10 +24,8 @@
                 "rust-analyzer"
               ])
             ];
-        shellHook = ''
+          };
-          zsh & disown
+        }
-          exit
+      );
-        '';
-      };
     };
 }