{
  lib,
  config,
  ...
}: {
  # git plugins
  programs.git = {
    lfs.enable = true;
    patdiff.enable = true;
  };

  # 懶惰鬼賴皮
  programs.lazygit = let
    patdiffCfg = config.programs.git.patdiff;
  in
    lib.mkIf patdiffCfg.enable {
      settings = {
        git.paging.externalDiffCommand = "${lib.getExe' patdiffCfg.package "patdiff-git-wrapper"}";
      };
    };

  # git itself
  programs.git = {
    extraConfig = {
      init.defaultBranch = "trunk"; # I like trees
      push.autoSetupRemote = true;
      pull.ff = "only";
      rerere.enabled = true;
    };
    ignores = [
      # sanity
      ".env"

      # vim
      "*~"
      "*.swp"

      # darwin
      "**/.DS_Store"

      # nix
      ".direnv/"
      "**/result"
      "**/result-*" # building an attr of derivation will make multiple links

      # pre-commit
      ".pre-commit-config.yaml"

      # dotfiles
      ".config/nvim/spell/"
    ];
  };

  # identity
  programs.git = {
    userEmail = "leana.jiang+git@icloud.com";
    userName = "Léana 江";
    signing = {
      key = "0x4E887A4CA9714ADA";
      signByDefault = lib.mkDefault false;
    };
  };
}