54 lines
1.7 KiB
Dart
54 lines
1.7 KiB
Dart
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/// Loads environment variables from a `.env` file.
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///
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/// ## usage
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///
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/// Once you call [load], the top-level [env] map is available.
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/// You may wish to prefix the import.
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///
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/// import 'package:dotenv/dotenv.dart' show load, env;
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///
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/// void main() {
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/// load();
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/// var x = env['foo'];
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/// // ...
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/// }
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///
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/// Verify required variables are present:
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///
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/// const _requiredEnvVars = const ['host', 'port'];
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/// bool get hasEnv => isEveryDefined(_requiredEnvVars);
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library dotenv;
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import 'dart:io';
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import 'package:meta/meta.dart';
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part 'parser.dart';
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var _env = Map<String, String>.from(Platform.environment);
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/// A copy of [Platform.environment](dart:io) including variables loaded at runtime from a file.
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Map<String, String> get env => _env;
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/// Overwrite [env] with a new writable copy of [Platform.environment](dart:io).
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Map clean() => _env = Map.from(Platform.environment);
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/// True if all supplied variables have nonempty value; false otherwise.
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/// Differs from [containsKey](dart:core) by excluding null values.
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/// Note [load] should be called first.
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bool isEveryDefined(Iterable<String> vars) =>
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vars.every((k) => _env[k] != null && (_env[k]?.isNotEmpty ?? false));
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/// Read environment variables from [filename] and add them to [env].
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/// Logs to [stderr] if [filename] does not exist.
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void load([String filename = '.env', Parser psr = const Parser()]) {
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var file = File.fromUri(Uri.file(filename));
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var lines = _verify(file);
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_env.addAll(psr.parse(lines));
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}
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List<String> _verify(File file) {
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if (file.existsSync()) return file.readAsLinesSync();
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stderr.writeln('[dotenv] Load failed: file not found: $file');
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return [];
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}
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