gnuchess: refactor

pkgs/games/gnuchess/default.nix

···
-{lib, stdenv, fetchurl, flex, makeWrapper}:
-let
-  s = # Generated upstream information
-  rec {
-    baseName="gnuchess";
-    version="6.2.9";
-    name="${baseName}-${version}";
-    url="mirror://gnu/chess/${name}.tar.gz";
-    sha256="sha256-3fzCC911aQCpq2xCx9r5CiiTv38ZzjR0IM42uuvEGJA=";
+{ lib, stdenv, fetchurl, flex, makeWrapper }:
+
+stdenv.mkDerivation rec {
+  pname = "gnuchess";
+  version = "6.2.9";
+
+  src = fetchurl {
+    url = "mirror://gnu/chess/gnuchess-${version}.tar.gz";
+    sha256 = "sha256-3fzCC911aQCpq2xCx9r5CiiTv38ZzjR0IM42uuvEGJA=";
   };
+
   buildInputs = [
     flex
   ];
-in
-stdenv.mkDerivation {
-  inherit (s) name version;
-  src = fetchurl {
-    inherit (s) url sha256;
-  };
-  inherit buildInputs;
   nativeBuildInputs = [ makeWrapper ];
 
   postInstall = ''
···
     wrapProgram $out/bin/gnuchessu --set PATH "$out/bin"
   '';
 
-  meta = {
-    inherit (s) version;
+  meta = with lib; {
     description = "GNU Chess engine";
-    maintainers = [lib.maintainers.raskin];
-    platforms = lib.platforms.unix;
-    license = lib.licenses.gpl3Plus;
+    maintainers = with maintainers; [ raskin ];
+    platforms = platforms.unix;
+    license = licenses.gpl3Plus;
   };
 }

pkgs/games/gnuchess/default.upstream

···
-url https://ftp.gnu.org/gnu/chess/