{
  haskellPackages,
  haskell,
  fetchFromGitea,
  installShellFiles,
}:
let
  inherit (haskell.lib.compose) justStaticExecutables overrideCabal;

  drv = haskellPackages.callCabal2nix "ruler" (fetchFromGitea {
    domain = "git.confusedcompiler.org";
    owner = "leana8959";
    repo = "ruler";
    rev = "89e63d4055cbeca840b6ecaab12683b19e8e2fdd";
    hash = "sha256-KPbb1JcFNTF5A6ImfGYc1iSxo3K6poCCRGFNqIHwzrM=";
  }) { };

  cabalOverrides = o: {
    buildTools = o.buildTools or [ ] ++ [ installShellFiles ];
    postInstall = o.postInstall or "" + ''
      installShellCompletion --cmd ruler \
          --bash <("$out/bin/ruler" --bash-completion-script "$out/bin/ruler") \
          --fish <("$out/bin/ruler" --fish-completion-script "$out/bin/ruler") \
          --zsh  <("$out/bin/ruler" --zsh-completion-script "$out/bin/ruler")
    '';
  };
in
justStaticExecutables (overrideCabal cabalOverrides drv)