keepAttrs -> getAttrs

flake.nix

@@ -11,11 +11,8 @@
     inherit util;
 
     genAttrs = import ./src/genAttrs.nix lib;
+    getAttrs = import ./src/getAttrs.nix lib;
     subtractLists = import ./src/subtractLists.nix lib;
     unique = import ./src/unique.nix lib;
-
-    # This doesn't actually exist, but I've seen it's definition being used
-    # a few places.
-    keepAttrs = import ./src/keepAttrs.nix lib;
   };
 }

src/getAttrs.nix

@@ -0,0 +1,12 @@
+lib:
+let
+  getAttrsOld = names: attrs: lib.genAttrs names (name: attrs.${name});
+  getAttrsNew1 = names: attrs: lib.filterAttrs (n: _: builtins.elem n names) attrs;
+  getAttrsNew2 = names: attrs: builtins.intersectAttrs (lib.genAttrs names (_: null)) attrs;
+
+  bigdata = lib.genAttrs (lib.imap0 (i: _: toString i) (lib.replicate 999999 null)) (_: null);
+in {
+  old = getAttrsOld [ "123" "456" ] bigdata;
+  new1 = getAttrsNew1 [ "123" "456" ] bigdata;
+  new2 = getAttrsNew2 [ "123" "456" ] bigdata;
+}

src/keepAttrs.nix

@@ -1,10 +0,0 @@
-lib:
-let
-  keepAttrsOld = attrs: names: lib.filterAttrs (n: _: builtins.elem n names) attrs;
-  keepAttrsNew = attrs: names: builtins.intersectAttrs (lib.genAttrs names (_: null)) attrs;
-
-  bigdata = lib.genAttrs (lib.imap0 (i: _: toString i) (lib.replicate 999999 null)) (_: null);
-in {
-  old = keepAttrsOld bigdata [ "123" "456" ];
-  new = keepAttrsNew bigdata [ "123" "456" ];
-}