nix: use some more consistent formatting

default.nix

@@ -19,7 +19,8 b' let'
     overlays = [
       (import ./pkgs/overlays.nix)
     ];
-    inherit (pkgs_)
+    inherit
+      (pkgs_)
       system;
   });
 
@@ -47,7 +48,11 b' let'
 
   sources =
     let
-      inherit (pkgs.lib) all isString attrValues;
+      inherit
+        (pkgs.lib)
+        all
+        isString
+        attrValues;
       sourcesConfig = pkgs.config.rc.sources or {};
     in
       # Ensure that sources are configured as strings. Using a path
@@ -161,12 +166,19 b' let'
       getAttr pythonPackages pkgs;
 
   pythonGeneratedPackages = import ./pkgs/python-packages.nix {
-    inherit pkgs;
-    inherit (pkgs) fetchurl fetchgit fetchhg;
+    inherit
+      pkgs;
+    inherit
+      (pkgs)
+      fetchurl
+      fetchgit
+      fetchhg;
   };
 
   pythonVCSServerOverrides = import ./pkgs/python-packages-overrides.nix {
-    inherit pkgs basePythonPackages;
+    inherit
+      pkgs
+      basePythonPackages;
   };