anchor.diff: -{ borgbackup, coreutils, lib, python3Packages, systemd }:
  +{ borgbackup, coreutils, lib, python3Packages, systemd, installShellFiles }:
   
   python3Packages.buildPythonApplication rec {
     pname = "borgmatic";
  
positive.code:     "test_borgmatic_version_matches_news_version"
    ];
  
    propagatedBuildInputs = with python3Packages; [
      borgbackup
      colorama
  
negative.code:   ];
  
    postInstall = ''
      installShellCompletion --cmd borgmatic \
        --bash <($out/bin/borgmatic --bash-completion)
  
      mkdir -p $out/lib/systemd/system
      cp sample/systemd/borgmatic.timer $out/lib/systemd/system/
      substitute sample/systemd/borgmatic.service \
  