{ ... }:
{
  programs.nixvim = {
    extraConfigLua = ''
      local function get_base_branch()
        -- Try to get the default branch from git config
        local default_branch_cmd = "git config --get init.defaultbranch || " ..
        "git symbolic-ref refs/remotes/origin/HEAD | sed 's!refs/remotes/origin/!!'"
        local default_branch = vim.fn.system(default_branch_cmd):gsub("%s+", "")

        -- If default branch is empty or fails, fall back to common defaults
        if not default_branch or default_branch == "" then
          local common_defaults = {"main", "master", "develop", "development"}
          for _, branch in ipairs(common_defaults) do
            local branch_exists = vim.fn.system(string.format("git branch --list %s", branch)):match("%s*" .. branch .. "%s*")
            if branch_exists and branch_exists ~= "" then
              default_branch = branch
              break
            end
          end
        end

        -- If still no default branch, use current branch
        if not default_branch or default_branch == "" then
          default_branch = vim.fn.system("git rev-parse --abbrev-ref HEAD"):gsub("%s+", "")
        end

        return default_branch
      end
    '';
    plugins.gitsigns = {
      enable = true;
    };

    autoGroups = {
      DynamicGitsignsBase = {
        clear = true;
      };
    };

    autoCmd = [
      {
        event = [ "BufEnter" "DirChanged" ];
        group = "DynamicGitsignsBase";
        callback.__raw = ''
          function()
              local ok, gs = pcall(require, 'gitsigns')
              if not ok then return end

              local new_base = get_base_branch()

              -- Use change_base command if available
              pcall(gs.change_base, new_base)
          end
        '';
      }
    ];
  };
}