Remove generic builder expression

This was an attempt to get maximal sharing with Nixpkgs but in hindsight it's better to just have some code duplication.

default.nix

@@ -1,6 +1,20 @@
-{ lib }:
-(import ./generic.nix {
-  version = "1.4.0";
+{ stdenv
+, callPackage
+, go
+, lib
+, makeWrapper
+, installShellFiles
+, fetchFromGitHub
+, buildGoApplication
+, mkGoEnv
+}:
+
+buildGoApplication {
+  pname = "gomod2nix";
+  version = "dev";
+
+  modules = ./gomod2nix.toml;
+
   src = lib.cleanSourceWith {
     filter = name: type: builtins.foldl' (v: s: v && ! lib.hasSuffix s name) true [
       "tests"
@@ -9,5 +23,32 @@
     ];
     src = lib.cleanSource ./.;
   };
-  modules = ./gomod2nix.toml;
-})
+
+  inherit go;
+
+  allowGoReference = true;
+
+  subPackages = [ "." ];
+
+  nativeBuildInputs = [ makeWrapper installShellFiles ];
+
+  passthru = {
+    inherit buildGoApplication mkGoEnv;
+  };
+
+  postInstall = lib.optionalString (stdenv.buildPlatform == stdenv.targetPlatform) ''
+    installShellCompletion --cmd gomod2nix \
+      --bash <($out/bin/gomod2nix completion bash) \
+      --fish <($out/bin/gomod2nix completion fish) \
+      --zsh <($out/bin/gomod2nix completion zsh)
+  '' + ''
+    wrapProgram $out/bin/gomod2nix --prefix PATH : ${lib.makeBinPath [ go ]}
+  '';
+
+  meta = {
+    description = "Convert applications using Go modules -> Nix";
+    homepage = "https://github.com/nix-community/gomod2nix";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.adisbladis ];
+  };
+}

flake.nix

@@ -29,7 +29,7 @@
           };
         in
         {
-          packages.default = pkgs.callPackage (pkgs.callPackage ./default.nix { }) { };
+          packages.default = pkgs.callPackage ./. { };
           devShells.default = import ./shell.nix { inherit pkgs; };
         })
     );

generic.nix

@@ -1,45 +0,0 @@
-{ version
-, src
-, modules
-}:
-{ stdenv
-, callPackage
-, go
-, lib
-, makeWrapper
-, installShellFiles
-, fetchFromGitHub
-, buildGoApplication ? (callPackage ./builder { }).buildGoApplication
-, mkGoEnv ? (callPackage ./builder { }).buildGoApplication
-}:
-
-buildGoApplication {
-  pname = "gomod2nix";
-  inherit version modules src go;
-
-  allowGoReference = true;
-
-  subPackages = [ "." ];
-
-  nativeBuildInputs = [ makeWrapper installShellFiles ];
-
-  passthru = {
-    inherit buildGoApplication mkGoEnv;
-  };
-
-  postInstall = lib.optionalString (stdenv.buildPlatform == stdenv.targetPlatform) ''
-    installShellCompletion --cmd gomod2nix \
-      --bash <($out/bin/gomod2nix completion bash) \
-      --fish <($out/bin/gomod2nix completion fish) \
-      --zsh <($out/bin/gomod2nix completion zsh)
-  '' + ''
-    wrapProgram $out/bin/gomod2nix --prefix PATH : ${lib.makeBinPath [ go ]}
-  '';
-
-  meta = {
-    description = "Convert applications using Go modules -> Nix";
-    homepage = "https://github.com/nix-community/gomod2nix";
-    license = lib.licenses.mit;
-    maintainers = [ lib.maintainers.adisbladis ];
-  };
-}

overlay.nix

@@ -6,5 +6,5 @@ let
 in
 {
   inherit (callPackage ./builder { }) buildGoApplication mkGoEnv;
-  gomod2nix = callPackage (callPackage ./default.nix { }) { };
+  gomod2nix = callPackage ./default.nix { };
 }