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inputs: {
  config,
  pkgs,
  lib,
  ...
}: {
  environment = {
    systemPackages = with pkgs; [unstable.git-branchless unstable.gitoxide watchman];
    shellAliases.git = "git-branchless wrap --";
  };

  programs.zsh.interactiveShellInit = ''
    source ${../../dotfiles/git-branchless.zsh}
  '';

  home-manager.users.minijackson = {
    programs.git = {
      enable = true;
      package = pkgs.gitAndTools.gitFull;
      userEmail = "minijackson@riseup.net";
      userName = "Minijackson";

      signing = {
        signByDefault = true;
        key = "minijackson@riseup.net";
      };

      extraConfig = let
        deltaCommand = "${pkgs.gitAndTools.delta}/bin/delta";
      in {
        init.defaultBranch = "master";

        core = {
          whitespace = "trailing-space,space-before-tab";
          pager = deltaCommand;
          interactive.diffFilter = "${deltaCommand} --color-only";
          untrackedCache = true;
        };

        diff = {
          algorithm = "histogram";
          colormoved = "default";
          colorMovedWS = "allow-indentation-change";
        };

        pull.ff = "only";

        rerere.enable = true;

        merge = {
          conflictStyle = "zdiff3";
          tool = "nvimdiff";
        };
        "mergetool \"nvimdiff\"" = {cmd = "nvim -d \"$LOCAL\" \"$MERGED\" \"$REMOTE\"";};

        delta = with config.theme.colors; {
          line-numbers = true;
          navigate = true;

          whitespace-error-style = "reverse green";

          minus-style = "normal red";
          minus-non-emph-style = "normal red";
          minus-emph-style = "normal brightred";
          minus-empty-line-marker-style = "normal red";

          plus-style = "reverse green";
          plus-non-emph-style = "reverse green";
          plus-emph-style = "reverse brightgreen";
          plus-empty-line-marker-style = "reverse green";

          line-numbers-minus-style = "brightred";
          line-numbers-zero-style = "brightblack";
          line-numbers-plus-style = "brightgreen";

          file-style = "bright${dominantName}";
          line-numbers-left-style = dominantName;
          line-numbers-right-style = dominantName;
        };
      };
    };
  };

  # TODO: move common to NixOS' programs.git.config
  home-manager.users.root = {
    # TODO: use `home-manager.sharedModules`?
    programs.git = with lib;
      mkMerge [
        (mkDefault config.home-manager.users.minijackson.programs.git)
        {
          signing = {
            signByDefault = false;
            key = null;
          };
        }
      ];
  };
}