lib.customisation: add uncurried form of makeScopeWithSplicing

Deeply-curried functions are pretty error-prone in untyped languages
like Nix. This is a particularly bad case because
`top-level/splice.nix` *also* declares a makeScopeWithSplicing, but
it takes *two fewer arguments*.

Let's add a version that uses attrset-passing form, to provide some
minimal level of sanity-checking.

This also provides defaults for keep and extra (these are often
unneeded by the user).

lib/customisation.nix

···
         };
     in self;
 
+  /* backward compatibility with old uncurried form; deprecated */
+  makeScopeWithSplicing =
+    splicePackages: newScope: otherSplices: keep: extra: f:
+    makeScopeWithSplicing' {
+      inherit splicePackages newScope otherSplices keep extra f;
+    };
+
   /* Like the above, but aims to support cross compilation. It's still ugly, but
      hopefully it helps a little bit. */
-  makeScopeWithSplicing = splicePackages: newScope: otherSplices: keep: extra: f:
+  makeScopeWithSplicing' =
+    { splicePackages
+    , newScope
+    }:
+    { otherSplices
+    , keep ? (_self: {})
+    , extra ? (_spliced0: {})
+    , f
+    }:
     let
       spliced0 = splicePackages {
         pkgsBuildBuild = otherSplices.selfBuildBuild;
···
         callPackage = newScope spliced; # == self.newScope {};
         # N.B. the other stages of the package set spliced in are *not*
         # overridden.
-        overrideScope = g: makeScopeWithSplicing
-          splicePackages
-          newScope
-          otherSplices
-          keep
-          extra
-          (lib.fixedPoints.extends g f);
+        overrideScope = g: (makeScopeWithSplicing'
+          { inherit splicePackages newScope; }
+          { inherit otherSplices keep extra;
+            f = lib.fixedPoints.extends g f;
+          });
         packages = f;
       };
     in self;

lib/default.nix

···
       noDepEntry fullDepEntry packEntry stringAfter;
     inherit (self.customisation) overrideDerivation makeOverridable
       callPackageWith callPackagesWith extendDerivation hydraJob
-      makeScope makeScopeWithSplicing;
+      makeScope makeScopeWithSplicing makeScopeWithSplicing';
     inherit (self.derivations) lazyDerivation;
     inherit (self.meta) addMetaAttrs dontDistribute setName updateName
       appendToName mapDerivationAttrset setPrio lowPrio lowPrioSet hiPrio

pkgs/top-level/splice.nix

···
 
   # prefill 2 fields of the function for convenience
   makeScopeWithSplicing = lib.makeScopeWithSplicing splicePackages pkgs.newScope;
+  makeScopeWithSplicing' = lib.makeScopeWithSplicing' { inherit splicePackages; inherit (pkgs) newScope; };
 
   # generate 'otherSplices' for 'makeScopeWithSplicing'
   generateSplicesForMkScope = attr: