1# https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix
 2{lib, ...}: {
 3  # Generate an attribute set from a list.
 4  #
 5  #   lib.genAttrs [ "foo" "bar" ] (name: "x_" + name)
 6  #     => { foo = "x_foo"; bar = "x_bar"; }
 7  listToAttrs = lib.genAttrs;
 8
 9  # Update only the values of the given attribute set.
10  #
11  #   mapAttrs
12  #   (name: value: ("bar-" + value))
13  #   { x = "a"; y = "b"; }
14  #     => { x = "bar-a"; y = "bar-b"; }
15  inherit (lib.attrsets) mapAttrs;
16
17  # Update both the names and values of the given attribute set.
18  #
19  #   mapAttrs'
20  #   (name: value: nameValuePair ("foo_" + name) ("bar-" + value))
21  #   { x = "a"; y = "b"; }
22  #     => { foo_x = "bar-a"; foo_y = "bar-b"; }
23  inherit (lib.attrsets) mapAttrs';
24
25  # Merge a list of attribute sets into one. smilar to the operator `a // b`, but for a list of attribute sets.
26  # NOTE: the later attribute set overrides the former one!
27  #
28  #   mergeAttrsList
29  #   [ { x = "a"; y = "b"; } { x = "c"; z = "d"; } { g = "e"; } ]
30  #   => { x = "c"; y = "b"; z = "d"; g = "e"; }
31  inherit (lib.attrsets) mergeAttrsList;
32
33  # Generate a string from an attribute set.
34  #
35  #   attrsets.foldlAttrs
36  #   (acc: name: value: acc + "\nexport ${name}=${value}")
37  #   "# A shell script"
38  #   { x = "a"; y = "b"; }
39  #     =>
40  #     ```
41  #     # A shell script
42  #     export x=a
43  #     export y=b
44  #    ````
45  inherit (lib.attrsets) foldlAttrs;
46}