{
  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 = "adf8f711b014cba4b73da0132c2be944ba20ba0b";
      hash = "sha256-sHJEgwEAMERhOCPY16Lsirj1bSUfEUpwNnPmHfg+/8Q=";
    })
    {};

  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)