{ pkgs, ... }:

{
  environment.systemPackages = [
    (pkgs.writeShellApplication {
      name = "git-churn";

      runtimeInputs = with pkgs; [
        git
        coreutils
        gnugrep
      ];

      text = ''
        git log -M -C --name-only --format='format:' "$@" |
          sort |
          grep -v '^$' |
          uniq -c |
          sort -n
      '';
    })
  ];
}