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lib:
{ root, exclude ? [] }:
with builtins; with lib;

# http://chriswarbo.net/projects/nixos/useful_hacks.html
let
  basename = removeSuffix ".nix";

  isMatch = name: type: (hasSuffix ".nix" name || type == "directory")
                     && ! elem name (map basename exclude);

  entry = name: _: {
    name = basename name;
    value = root + "/${name}";
  };
in mapAttrs' entry (filterAttrs isMatch (readDir root))