Less repetitiveness in Nix files

flake.nix

@@ -27,14 +27,13 @@
           };
         };
         packages = {
-          # Besides the `src` and `version` arguments, this package.nix could
+          # Besides the `src` and `cargoTomlPkg` arguments, this package.nix could
           # be copied as is to Nixpkgs'
           # pkgs/development/python-modules/pysequoia/default.nix, and should be
           # maintained in parallel to this local version of it.
           pysequoia = pkgs.python3.pkgs.callPackage ./package.nix {
             src = self;
-            # Get the version defined in pyproject.toml
-            version = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.version;
+            cargoTomlPkg = builtins.fromTOML (builtins.readFile ./Cargo.toml).package;
           };
         };
       }

package.nix

@@ -1,7 +1,7 @@
 { lib
 , buildPythonPackage
 , src
-, version
+, cargoTomlPkg
 , pkg-config
 , rustPlatform
 , cargo
@@ -17,7 +17,8 @@
 
 buildPythonPackage rec {
   pname = "pysequoia";
-  inherit src version;
+  inherit src;
+  inherit (cargoTomlPkg) version;
   pyproject = true;
 
   # This attribute is defined differently in Nixpkgs - using
@@ -50,11 +51,13 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "pysequoia" ];
 
-  meta = with lib; {
-    description = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.description;
-    downloadPage = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.repository;
-    homepage = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.homepage;
-    license = licenses.asl20;
-    maintainers = with maintainers; [ doronbehar ];
+  meta = {
+    inherit (cargoTomlPkg)
+      description
+      homepage
+    ;
+    downloadPage = cargoTomlPkg.repository;
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ doronbehar ];
   };
 }