lib/build.dart

// Copyright 2024, the Dart project authors. Please see the AUTHORS file
// for details. 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.dart';
import 'useful_directory.dart';
import 'package:file/file.dart';

import 'command.dart';

mixin UnzipBuild on Package {
  /// Unzip all [inputs] into the [workingDirectory] using `tar` for `.tar.(bz2|gz)`
  /// files and unzip for `.zip` files.
  @override
  Future<Directory> build(
      List<FileSystemEntity> inputs, Directory workingDirectory) async {
    final target =
        await workingDirectory.resolve('unzipped').create(recursive: true);
    for (final archive in inputs) {
      if (archive is! File) {
        throw StateError('Expected files, but got: $archive');
      }
      final command = _unzipCommand(archive, target);
      final result = await command.run();
      if (result.exitCode != 0) {
        throw FormatException('Failed to unpack $archive'
            ' (${command.executable} exited with ${result.exitCode}):\n'
            '${result.stderr}');
      }
    }
    return target;
  }

  Command _unzipCommand(File archive, Directory target) {
    var command = 'tar';
    List<String> args;
    final path = archive.path;
    if (path.endsWith('.zip')) {
      command = 'unzip';
      args = ['-d', target.path, path];
    } else if (archive.path.endsWith('.tar.gz')) {
      args = ['-xzf', path, '-C', target.path];
    } else if (archive.path.endsWith('.tar.bz2')) {
      args = ['-xjf', path, '-C', target.path];
    } else {
      throw StateError('Failed to unpack $archive: unsupported file format.');
    }
    return Command(command, args);
  }
}