config.nix

{ pkgs }:

let
  vimrc = import ./vimrc.nix {};

  customPlugins = import ./vimPlugins.nix {};
in
...

error

anonymous function at /Users/bmartin/.nixpkgs/vimPlugins.nix:1:1 called without required argument ‘pkgs’, at /Users/bmartin/.nixpkgs/config.nix:6:19

vimPlugins.nix

{ pkgs }:

with pkgs; rec {
  ListToggle = pkgs.vimUtils.buildVimPlugin {
    name = "ListToggle-2015-06-16";
    src = pkgs.fetchgit {
      url = "git://github.com/Valloric/ListToggle";
      rev = "6d53c79a9b58542513b159ebcf50ed16a614c53a";
      sha256 = "18a421eefe31b8677adcc6d5621b3163e2bf15c57cb8d3ebb0ca6f14cfef12fe";
    };
    dependencies = [];
  };

  base16 = pkgs.vimUtils.buildVimPlugin {
    name = "base16-2015-06-16";
    src = pkgs.fetchgit {
      url = "git://github.com/chriskempson/base16-vim";
      rev = "e711e9b1412b55fec7e8a5cff4ac5c06f9078729";
      sha256 = "527770c85f89f0f47f910b78315c3c9b7e4aac2a69019b77d477c58c31caf5d9";
    };
    dependencies = [];
  };
}