treefmt: add shell completions (#473283)

{

  lib,

  stdenv,

  buildGoModule,

  callPackages,

  fetchFromGitHub,

  installShellFiles,

}:

buildGoModule rec {

  pname = "treefmt";

    "-X github.com/numtide/treefmt/v2/build.Version=v${version}"

  ];

  nativeBuildInputs = [ installShellFiles ];

  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''

    installShellCompletion --cmd treefmt \

      --bash <($out/bin/treefmt --completion bash) \

      --fish <($out/bin/treefmt --completion fish) \

      --zsh <($out/bin/treefmt --completion zsh)

  '';

  passthru = {

    inherit (callPackages ./lib.nix { })

      evalConfig