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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/// Make `n` copies of flutter_gallery.
import 'dart:io';
import 'package:args/args.dart';
import 'package:path/path.dart' as path;
/// If no `copies` param is passed in, we scale the generated app up to 60k lines.
const int kTargetLineCount = 60 * 1024;
void main(List<String> args) {
// If we're run from the `tools` dir, set the cwd to the repo root.
if (path.basename(Directory.current.path) == 'tools')
Directory.current = Directory.current.parent.parent;
final ArgParser argParser = ArgParser();
argParser.addOption('out');
argParser.addOption('copies');
argParser.addFlag('delete', negatable: false);
argParser.addFlag('help', abbr: 'h', negatable: false);
final ArgResults results = argParser.parse(args);
if (results['help'] as bool) {
print('Generate n copies of flutter_gallery.\n');
print('usage: dart mega_gallery.dart <options>');
print(argParser.usage);
exit(0);
}
final Directory source = Directory(_normalize('dev/integration_tests/flutter_gallery'));
final Directory out = Directory(_normalize(results['out'] as String));
if (results['delete'] as bool) {
if (out.existsSync()) {
print('Deleting ${out.path}');
out.deleteSync(recursive: true);
}
exit(0);
}
if (!results.wasParsed('out')) {
print('The --out parameter is required.');
print(argParser.usage);
exit(1);
}
int copies;
if (!results.wasParsed('copies')) {
final SourceStats stats = getStatsFor(_dir(source, 'lib'));
copies = (kTargetLineCount / stats.lines).round();
} else {
copies = int.parse(results['copies'] as String);
}
print('Making $copies copies of flutter_gallery.');
print('');
print('Stats:');
print(' packages/flutter : ${getStatsFor(Directory("packages/flutter"))}');
print(' dev/integration_tests/flutter_gallery : ${getStatsFor(Directory("dev/integration_tests/flutter_gallery"))}');
final Directory lib = _dir(out, 'lib');
if (lib.existsSync())
lib.deleteSync(recursive: true);
// Copy everything that's not a symlink, dot directory, or build/.
_copy(source, out);
// Make n - 1 copies.
for (int i = 1; i < copies; i++)
_copyGallery(out, i);
// Create a new entry-point.
_createEntry(_file(out, 'lib/main.dart'), copies);
// Update the pubspec.
String pubspec = _file(out, 'pubspec.yaml').readAsStringSync();
pubspec = pubspec.replaceAll('../../packages/flutter', '../../../packages/flutter');
_file(out, 'pubspec.yaml').writeAsStringSync(pubspec);
// Remove the (flutter_gallery specific) analysis_options.yaml file.
_file(out, 'analysis_options.yaml').deleteSync();
_file(out, '.dartignore').writeAsStringSync('');
// Count source lines and number of files; tell how to run it.
print(' ${path.relative(results["out"] as String)} : ${getStatsFor(out)}');
}
// TODO(devoncarew): Create an entry-point that builds a UI with all `n` copies.
void _createEntry(File mainFile, int copies) {
final StringBuffer imports = StringBuffer();
for (int i = 1; i < copies; i++) {
imports.writeln('// ignore: unused_import');
imports.writeln("import 'gallery_$i/main.dart' as main_$i;");
}
final String contents = '''
// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/widgets.dart';
import 'gallery/app.dart';
${imports.toString().trim()}
void main() {
runApp(const GalleryApp());
}
''';
mainFile.writeAsStringSync(contents);
}
void _copyGallery(Directory galleryDir, int index) {
final Directory lib = _dir(galleryDir, 'lib');
final Directory dest = _dir(lib, 'gallery_$index');
dest.createSync();
// Copy demo/, gallery/, and main.dart.
_copy(_dir(lib, 'demo'), _dir(dest, 'demo'));
_copy(_dir(lib, 'gallery'), _dir(dest, 'gallery'));
_file(dest, 'main.dart').writeAsBytesSync(_file(lib, 'main.dart').readAsBytesSync());
}
void _copy(Directory source, Directory target) {
if (!target.existsSync())
target.createSync(recursive: true);
for (final FileSystemEntity entity in source.listSync(followLinks: false)) {
final String name = path.basename(entity.path);
if (entity is Directory) {
if (name == 'build' || name.startsWith('.'))
continue;
_copy(entity, Directory(path.join(target.path, name)));
} else if (entity is File) {
if (name == '.packages' || name == 'pubspec.lock')
continue;
final File dest = File(path.join(target.path, name));
dest.writeAsBytesSync(entity.readAsBytesSync());
}
}
}
Directory _dir(Directory parent, String name) => Directory(path.join(parent.path, name));
File _file(Directory parent, String name) => File(path.join(parent.path, name));
String _normalize(String filePath) => path.normalize(path.absolute(filePath));
class SourceStats {
int files = 0;
int lines = 0;
@override
String toString() => '${_comma(files).padLeft(3)} files, ${_comma(lines).padLeft(6)} lines';
}
SourceStats getStatsFor(Directory dir, [SourceStats? stats]) {
stats ??= SourceStats();
for (final FileSystemEntity entity in dir.listSync(recursive: false, followLinks: false)) {
final String name = path.basename(entity.path);
if (entity is File && name.endsWith('.dart')) {
stats.files += 1;
stats.lines += _lineCount(entity);
} else if (entity is Directory && !name.startsWith('.')) {
getStatsFor(entity, stats);
}
}
return stats;
}
int _lineCount(File file) {
return file.readAsLinesSync().where((String line) {
line = line.trim();
if (line.isEmpty || line.startsWith('//'))
return false;
return true;
}).length;
}
String _comma(int count) {
final String str = count.toString();
if (str.length > 3)
return '${str.substring(0, str.length - 3)},${str.substring(str.length - 3)}';
return str;
}