{
  lib,
  nixvimTypes,
  nixvimUtils,
}:
with lib;
with nixvimUtils; rec {
  # Creates an option with a nullable type that defaults to null.
  mkNullOrOption = type: desc:
    lib.mkOption {
      type = lib.types.nullOr type;
      default = null;
      description = desc;
    };

  mkCompositeOption = desc: options:
    mkNullOrOption (types.submodule {inherit options;}) desc;

  mkNullOrStr = mkNullOrOption (with nixvimTypes; maybeRaw str);

  mkNullOrLua = desc:
    lib.mkOption {
      type = lib.types.nullOr nixvimTypes.strLua;
      default = null;
      description = desc;
      apply = mkRaw;
    };

  mkNullOrLuaFn = desc:
    lib.mkOption {
      type = lib.types.nullOr nixvimTypes.strLuaFn;
      default = null;
      description = desc;
      apply = mkRaw;
    };

  mkNullOrStrLuaOr = ty: desc:
    lib.mkOption {
      type = lib.types.nullOr (types.either nixvimTypes.strLua ty);
      default = null;
      description = desc;
      apply = v:
        if builtins.isString v
        then mkRaw v
        else v;
    };

  mkNullOrStrLuaFnOr = ty: desc:
    lib.mkOption {
      type = lib.types.nullOr (types.either nixvimTypes.strLuaFn ty);
      default = null;
      description = desc;
      apply = v:
        if builtins.isString v
        then mkRaw v
        else v;
    };

  defaultNullOpts = rec {
    mkNullable = type: default: desc:
      mkNullOrOption type (
        let
          defaultDesc = "default: `${default}`";
        in
          if desc == ""
          then defaultDesc
          else ''
            ${desc}

            ${defaultDesc}
          ''
      );

    mkNullableWithRaw = type: mkNullable (maybeRaw type);

    mkStrLuaOr = type: default: desc:
      mkNullOrStrLuaOr type (let
        defaultDesc = "default: `${default}`";
      in
        if desc == ""
        then defaultDesc
        else ''
          ${desc}

          ${defaultDesc}
        '');

    mkStrLuaFnOr = type: default: desc:
      mkNullOrStrLuaFnOr type (let
        defaultDesc = "default: `${default}`";
      in
        if desc == ""
        then defaultDesc
        else ''
          ${desc}

          ${defaultDesc}
        '');

    mkLua = default: desc:
      mkNullOrLua
      (
        (optionalString (desc != "") ''
          ${desc}

        '')
        + ''
          default: `${default}`
        ''
      );

    mkLuaFn = default: desc: let
      defaultDesc = "default: `${default}`";
    in
      mkNullOrLuaFn
      (
        if desc == ""
        then defaultDesc
        else ''
          ${desc}

          ${defaultDesc}
        ''
      );

    mkNum = default: mkNullable (with nixvimTypes; maybeRaw number) (toString default);
    mkInt = default: mkNullable (with nixvimTypes; maybeRaw int) (toString default);
    # Positive: >0
    mkPositiveInt = default: mkNullable (with nixvimTypes; maybeRaw ints.positive) (toString default);
    # Unsigned: >=0
    mkUnsignedInt = default: mkNullable (with nixvimTypes; maybeRaw ints.unsigned) (toString default);
    mkBool = default:
      mkNullable (with nixvimTypes; maybeRaw bool) (
        if default
        then "true"
        else "false"
      );
    mkStr = default: mkNullable (with nixvimTypes; maybeRaw str) ''${builtins.toString default}'';
    mkAttributeSet = default: mkNullable nixvimTypes.attrs ''${default}'';
    mkListOf = ty: default: mkNullable (with nixvimTypes; listOf (maybeRaw ty)) default;
    mkAttrsOf = ty: default: mkNullable (with nixvimTypes; attrsOf (maybeRaw ty)) default;
    mkEnum = enumValues: default: mkNullable (with nixvimTypes; maybeRaw (enum enumValues)) ''"${default}"'';
    mkEnumFirstDefault = enumValues: mkEnum enumValues (head enumValues);
    mkBorder = default: name: desc:
      mkNullable
      (with nixvimTypes; maybeRaw border)
      default
      (let
        defaultDesc = ''
          Defines the border to use for ${name}.
          Accepts same border values as `nvim_open_win()`. See `:help nvim_open_win()` for more info.
        '';
      in
        if desc == ""
        then defaultDesc
        else ''
          ${desc}
          ${defaultDesc}
        '');
    mkSeverity = default: desc:
      mkOption {
        type = with types;
          nullOr
          (
            either ints.unsigned
            (
              enum
              ["error" "warn" "info" "hint"]
            )
          );
        default = null;
        apply =
          mapNullable
          (
            value:
              if isInt value
              then value
              else mkRaw "vim.diagnostic.severity.${strings.toUpper value}"
          );
        description = let
          defaultDesc = "default: `${toString default}`";
        in
          if desc == ""
          then defaultDesc
          else ''
            ${desc}

            ${defaultDesc}
          '';
      };
    mkLogLevel = default: desc:
      mkOption {
        type = with types;
          nullOr
          (
            either
            ints.unsigned
            nixvimTypes.logLevel
          );
        default = null;
        apply =
          mapNullable
          (
            value:
              if isInt value
              then value
              else mkRaw "vim.log.levels.${strings.toUpper value}"
          );
        description = let
          defaultDesc = "default: `${toString default}`";
        in
          if desc == ""
          then defaultDesc
          else ''
            ${desc}

            ${defaultDesc}
          '';
      };

    mkHighlight = default: name: desc:
      mkNullable
      nixvimTypes.highlight
      default
      (
        if desc == ""
        then "Highlight settings."
        else desc
      );
  };

  mkPackageOption = name: default:
    mkOption {
      type = types.package;
      inherit default;
      description = "Plugin to use for ${name}";
    };

  mkSettingsOption = {
    options ? {},
    description,
    example ? null,
  }:
    mkOption {
      type = with types;
        submodule {
          freeformType = attrsOf anything;
          inherit options;
        };
      default = {};
      inherit description;
      example =
        if example == null
        then {
          foo_bar = 42;
          hostname = "localhost:8080";
          callback.__raw = ''
            function()
              print('nixvim')
            end
          '';
        }
        else example;
    };
}