Typed Config

// Run this example from the package root:
//   dart run example/typed_config_example.dart

// print() is fine in example scripts; avoid it in production code instead.
// ignore_for_file: avoid_print

import 'package:pdata/pdata.dart';

void main() {
  final config = <String, dynamic>{
    'server': {'host': '0.0.0.0', 'port': 8080, 'debug': false},
    'database': {
      'url': 'postgres://localhost/myapp',
      'pool_size': 10,
    },
    'admins': ['alice', 'bob'],
  };

  pdataWriteFile('build/app_config.toml', config);

  final loaded = pdataReadFile('build/app_config.toml') as Map<String, dynamic>;

  // getMap/getList/getInt/etc. give a clear FormatException instead of a
  // crash when a key is missing or the wrong shape.
  final server = loaded.getMap('server');
  print('Server: ${server.getString('host')}:${server.getInt('port')}');
  print('Debug mode: ${server.getBool('debug')}');

  final database = loaded.getMap('database');
  print('Database URL: ${database.getString('url')}');
  print('Pool size: ${database.getInt('pool_size', defaultValue: 5)}');

  final admins = loaded.getList('admins');
  print('Admins: ${admins.join(', ')}');

  // A key that doesn't exist and has no default throws a clear error.
  try {
    server.getInt('max_connections');
  } on FormatException catch (e) {
    print('\nExpected error for a missing key: $e');
  }
}

dart run example/typed_config_example.dart