{ config, lib, pkgs, ... }:

let cfg = config.plugins.gitsigns; in

{
  options.plugins.gitsigns = with lib; {
    enable = mkEnableOption "gitsigns-nvim";

    package = mkPackageOption pkgs.vimPlugins "gitsigns-nvim" { };

    settings = mkOption {
      type = types.attrs;
      default = { };
    };

    keymap.set = mkOption {
      type = with types; listOf keymap;
      default = [ ];
    };
  };

  config = lib.mkIf cfg.enable {
    fn.gitsigns-nvim-on-attach = lib.mkIf (cfg.keymap.set != [ ]) {
      args = [ "bufnr" ];
      content = { bufnr }: {
        vim.keymap.set = map (attrs: attrs // { buffer = bufnr; }) cfg.keymap.set;
      };
    };

    plugin.gitsigns-nvim = {
      name = "gitsigns";
      varName = "gs";
      package = cfg.package;
      setupSettings = lib.mkMerge [
        cfg.settings
        (lib.mkIf (cfg.keymap.set != [ ]) {
          on_attach = config.fn.gitsigns-nvim-on-attach.lambda;
        })
      ];
    };
  };
}