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flutter_gen_runner.dart
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flutter_gen_runner.dart
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import 'dart:collection';
import 'dart:io';
import 'package:build/build.dart';
import 'package:collection/collection.dart';
import 'package:crypto/crypto.dart';
import 'package:flutter_gen_core/flutter_generator.dart';
import 'package:flutter_gen_core/settings/config.dart';
import 'package:glob/glob.dart';
import 'package:path/path.dart';
Builder build(BuilderOptions options) => FlutterGenBuilder();
class FlutterGenBuilder extends Builder {
static AssetId _output(BuildStep buildStep, String path) {
return AssetId(
buildStep.inputId.package,
path,
);
}
final generator = FlutterGenerator(File('pubspec.yaml'));
late final _config = loadPubspecConfigOrNull(generator.pubspecFile);
_FlutterGenBuilderState? _currentState;
@override
Future<void> build(BuildStep buildStep) async {
if (_config == null) return;
final state = await _createState(_config!, buildStep);
if (state.shouldSkipGenerate(_currentState)) return;
_currentState = state;
await generator.build(
config: _config,
writer: (contents, path) {
buildStep.writeAsString(_output(buildStep, path), contents);
},
);
}
@override
Map<String, List<String>> get buildExtensions {
if (_config == null) return {};
final ouput = _config!.pubspec.flutterGen.output;
return {
r'$package$': [
for (final name in [
generator.assetsName,
generator.colorsName,
generator.fontsName
])
join(ouput, name),
],
};
}
Future<_FlutterGenBuilderState> _createState(
Config config,
BuildStep buildStep,
) async {
final pubspec = config.pubspec;
final HashSet<String> assets = HashSet();
if (pubspec.flutterGen.assets.enabled) {
for (var assetInput in pubspec.flutter.assets) {
if (assetInput.isEmpty) continue;
if (assetInput.endsWith('/')) assetInput += '*';
await for (final assetId in buildStep.findAssets(Glob(assetInput))) {
assets.add(assetId.path);
}
}
}
final HashMap<String, Digest> colors = HashMap();
if (pubspec.flutterGen.colors.enabled) {
for (final colorInput in pubspec.flutterGen.colors.inputs) {
if (colorInput.isEmpty) continue;
await for (final assetId in buildStep.findAssets(Glob(colorInput))) {
final digest = await buildStep.digest(assetId);
colors[assetId.path] = digest;
}
}
}
final pubspecAsset =
await buildStep.findAssets(Glob(config.pubspecFile.path)).single;
final pubspecDigest = await buildStep.digest(pubspecAsset);
return _FlutterGenBuilderState(
pubspecDigest: pubspecDigest,
assets: assets,
colors: colors,
);
}
}
class _FlutterGenBuilderState {
final Digest pubspecDigest;
final HashSet<String> assets;
final HashMap<String, Digest> colors;
_FlutterGenBuilderState({
required this.pubspecDigest,
required this.assets,
required this.colors,
});
bool shouldSkipGenerate(_FlutterGenBuilderState? previous) {
if (previous == null) return false;
return pubspecDigest == previous.pubspecDigest &&
const SetEquality().equals(assets, previous.assets) &&
const MapEquality().equals(colors, previous.colors);
}
}