flake: package: remove needless unpackPase override

flake.nix

@@ -1,58 +1,62 @@
 {
   description = "A script to patch the MonoLisa font with Nerd Fonts glyphs.";
-  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 
-  outputs = inputs @ {
-    self,
-    nixpkgs,
-  }: let
-    inherit (nixpkgs.lib) genAttrs;
-    forAllSystems = f:
-      genAttrs
-      ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"]
-      (system: f nixpkgs.legacyPackages.${system});
-  in {
-    packages = forAllSystems (
-      pkgs:
-      with pkgs; {
-        default = stdenv.mkDerivation {
-        name = "monolisa-nerdfont-patch";
-        src = ./.;
-        nativeBuildInputs = [ makeWrapper ];
-        buildInputs = [
-          fontforge
-          python3
-        ];
-        unpackPhase = ":";
-        buildPhase = ":";
-        installPhase = ''
-          mkdir -p $out/bin
-          install -m755 -D ${./patch-monolisa} $out/bin/monolisa-nerdfont-patch
-          install -m755 -D ${./font-patcher} $out/bin/font-patcher
-          cp -r ${./bin} $out/bin/bin
-          cp -r ${./src} $out/bin/src
-        '';
-        postFixup = ''
-          wrapProgram $out/bin/monolisa-nerdfont-patch \
-            --set PATH ${lib.makeBinPath [
-              fontforge
-            ]}
-          '';
-      };
-    }
-      );
-
-    devShells = forAllSystems (
-      pkgs:
-        with pkgs; {
-          default = mkShell {
-            buildInputs = [
-              fontforge
-              python3
-              pre-commit
-            ];
-          };
-        }
-    );
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    systems.url = "github:nix-systems/default-linux";
+    nixfmt.url = "github:serokell/nixfmt";
   };
+
+  outputs = { self, nixpkgs, systems, nixfmt, }:
+    let
+      inherit (nixpkgs) lib;
+      eachSystem = lib.genAttrs (import systems);
+      pkgsFor = eachSystem (system:
+        import nixpkgs {
+          localSystem.system = system;
+          overlays = [ self.overlays.default ];
+        });
+    in {
+      overlays = {
+        default = pkgs: pkgs0: {
+          monolisa-nerdfont-patch = pkgs.stdenv.mkDerivation {
+            name = "monolisa-nerdfont-patch";
+            src = ./.;
+            nativeBuildInputs = with pkgs; [ makeWrapper ];
+            buildInputs = with pkgs; [ fontforge python3 ];
+            buildPhase = ":";
+            installPhase = ''
+              mkdir -p $out/bin
+              install -m755 -D ${
+                ./patch-monolisa
+              } $out/bin/monolisa-nerdfont-patch
+              install -m755 -D ${./font-patcher} $out/bin/font-patcher
+              cp -r ${./bin} $out/bin/bin
+              cp -r ${./src} $out/bin/src
+            '';
+            postFixup = ''
+              wrapProgram $out/bin/monolisa-nerdfont-patch \
+                --set PATH ${lib.makeBinPath (with pkgs; [ fontforge ])}
+            '';
+          };
+        };
+      };
+
+      packages = eachSystem (system:
+        let pkgs = pkgsFor.${system};
+        in {
+          default = self.packages.${system}.monolisa-nerdfont-patch;
+          monolisa-nerdfont-patch = pkgs.monolisa-nerdfont-patch;
+        });
+
+      devShells = eachSystem (system:
+        let pkgs = pkgsFor.${system};
+        in {
+          default = pkgs.mkShell {
+            buildInputs = with pkgs; [ fontforge python3 pre-commit ];
+          };
+        });
+
+      formatter = eachSystem (system: nixfmt.packages.${system}.default);
+    };
 }