nix-community.nixvim/modules/highlights.nix

{
  lib,
  helpers,
  config,
  ...
}:
with lib; {
  options = {
    highlight = mkOption {
      type = types.attrsOf helpers.highlightType;
      default = {};
      description = "Define highlight groups";
      example = ''
        highlight = {
          Comment.fg = "#ff0000";
        };
      '';
    };

    match = mkOption {
      type = types.attrsOf types.str;
      default = {};
      description = "Define match groups";
      example = ''
        match = {
          ExtraWhitespace = "\\s\\+$";
        };
      '';
    };
  };

  config = mkIf (config.highlight != {} || config.match != {}) {
    extraConfigLuaPost =
      (optionalString (config.highlight != {}) ''
        -- Highlight groups {{
        do
          local highlights = ${helpers.toLuaObject config.highlight}

          for k,v in pairs(highlights) do
            vim.api.nvim_set_hl(0, k, v)
          end
        end
        -- }}
      '')
      + (optionalString (config.match != {}) ''
        -- Match groups {{
          do
            local match = ${helpers.toLuaObject config.match}

            for k,v in pairs(match) do
              vim.fn.matchadd(k, v)
            end
          end
          -- }}
      '');
  };
}