feat: my custom libAttrs

lib/attrs.nix

@@ -0,0 +1,46 @@
+{ lib, ... }:
+
+rec {
+  # Generate an attribute set from a list.
+  #
+  #   lib.genAttrs [ "foo" "bar" ] (name: "x_" + name)
+  #     => { foo = "x_foo"; bar = "x_bar"; }
+  listToAttrs = lib.genAttrs;
+
+  # Update only the values of the given attribute set.
+  # 
+  #   mapAttrs
+  #   (name: value: ("bar-" + value))
+  #   { x = "a"; y = "b"; }
+  #     => { foo = "bar-a"; foo = "bar-b"; }
+  mapAttrs = lib.attrsets.mapAttrs;
+
+  # Update both the names and values of the given attribute set.
+  # 
+  #   mapAttrs'
+  #   (name: value: nameValuePair ("foo_" + name) ("bar-" + value))
+  #   { x = "a"; y = "b"; }
+  #     => { foo_x = "bar-a"; foo_y = "bar-b"; }
+  mapAttrs' = lib.attrsets.mapAttrs';
+
+  # Merge a list of attribute sets into one. smilar to the operator `a // b`, but for a list of attribute sets.
+  #
+  #   mergeAttrsList
+  #   [ { x = "a"; y = "b"; } { x = "c"; z = "d"; } { g = "e"; } ]
+  #   => { x = "c"; y = "b"; z = "d"; g = "e"; }
+  mergeAttrsList = lib.attrsets.mergeAttrsList;
+
+  # Generate a string from an attribute set.
+  # 
+  #   attrsets.foldlAttrs
+  #   (acc: name: value: acc + "\nexport ${name}=${value}")
+  #   "# A shell script"
+  #   { x = "a"; y = "b"; }
+  #     =>
+  #     ```
+  #     # A shell script
+  #     export x=a
+  #     export y=b
+  #    ````
+  foldlAttrs = lib.attrsets.foldlAttrs;
+}