feat: add workspace support for packages check licenses

lib/src/commands/packages/commands/check/commands/licenses.dart

@@ -20,6 +20,7 @@ import 'package:package_config/package_config.dart' as package_config;
 import 'package:pana/src/license_detection/license_detector.dart' as detector;
 import 'package:path/path.dart' as path;
 import 'package:very_good_cli/src/pub_license/spdx_license.gen.dart';
+import 'package:very_good_cli/src/pubspec/pubspec.dart';
 import 'package:very_good_cli/src/pubspec_lock/pubspec_lock.dart';
 
 /// Overrides the [package_config.findPackageConfig] function for testing.
@@ -35,6 +36,10 @@ Future<detector.Result> Function(String, double)? detectLicenseOverride;
 @visibleForTesting
 const pubspecLockBasename = 'pubspec.lock';
 
+/// The basename of the pubspec file.
+@visibleForTesting
+const pubspecBasename = 'pubspec.yaml';
+
 /// The URI for the pub.dev license page for the given [packageName].
 @visibleForTesting
 Uri pubLicenseUri(String packageName) =>
@@ -178,11 +183,48 @@ class PackagesCheckLicensesCommand extends Command<int> {
       return ExitCode.noInput.code;
     }
 
+    // Check if this is a workspace root and collect dependencies accordingly
+    final pubspecFile = File(path.join(targetPath, pubspecBasename));
+    final pubspec = _tryParsePubspec(pubspecFile);
+
+    // Collect workspace dependencies if this is a workspace root
+    final workspaceDependencies = _collectWorkspaceDependencies(
+      pubspec: pubspec,
+      targetDirectory: targetDirectory,
+      dependencyTypes: dependencyTypes,
+    );
+
     final filteredDependencies = pubspecLock.packages.where((dependency) {
       if (!dependency.isPubHosted) return false;
 
       if (skippedPackages.contains(dependency.name)) return false;
 
+      // If we have workspace dependencies, use them for filtering direct deps
+      if (workspaceDependencies != null) {
+        // For direct-main and direct-dev, check against workspace dependencies
+        if (dependencyTypes.contains('direct-main') ||
+            dependencyTypes.contains('direct-dev')) {
+          if (workspaceDependencies.contains(dependency.name)) {
+            return true;
+          }
+        }
+
+        // For transitive and direct-overridden, still use pubspec.lock types
+        final dependencyType = dependency.type;
+        if (dependencyTypes.contains('transitive') &&
+            dependencyType == PubspecLockPackageDependencyType.transitive) {
+          return true;
+        }
+        if (dependencyTypes.contains('direct-overridden') &&
+            dependencyType ==
+                PubspecLockPackageDependencyType.directOverridden) {
+          return true;
+        }
+
+        return false;
+      }
+
+      // Non-workspace: use the original filtering logic
       final dependencyType = dependency.type;
       return (dependencyTypes.contains('direct-main') &&
               dependencyType == PubspecLockPackageDependencyType.directMain) ||
@@ -497,3 +539,69 @@ extension on List<Object> {
     return '${join(', ')} and $last';
   }
 }
+
+/// Attempts to parse a [Pubspec] from a file.
+///
+/// Returns `null` if the file doesn't exist or cannot be parsed.
+Pubspec? _tryParsePubspec(File pubspecFile) {
+  if (!pubspecFile.existsSync()) return null;
+  try {
+    return Pubspec.fromFile(pubspecFile);
+  } on PubspecParseException catch (_) {
+    return null;
+  }
+}
+
+/// Collects dependencies from a workspace.
+///
+/// If [pubspec] is not a workspace root, returns `null`.
+/// Otherwise, returns a set of dependency names collected from all workspace
+/// members based on the requested [dependencyTypes].
+Set<String>? _collectWorkspaceDependencies({
+  required Pubspec? pubspec,
+  required Directory targetDirectory,
+  required List<String> dependencyTypes,
+}) {
+  if (pubspec == null || !pubspec.isWorkspaceRoot) return null;
+
+  final dependencies = <String>{};
+
+  // Collect dependencies from the root pubspec itself
+  if (dependencyTypes.contains('direct-main')) {
+    dependencies.addAll(pubspec.dependencies);
+  }
+  if (dependencyTypes.contains('direct-dev')) {
+    dependencies.addAll(pubspec.devDependencies);
+  }
+
+  // Collect dependencies from workspace members
+  final members = pubspec.resolveWorkspaceMembers(targetDirectory);
+  for (final memberDirectory in members) {
+    final memberPubspecFile = File(
+      path.join(memberDirectory.path, pubspecBasename),
+    );
+    final memberPubspec = _tryParsePubspec(memberPubspecFile);
+    if (memberPubspec == null) continue;
+
+    if (dependencyTypes.contains('direct-main')) {
+      dependencies.addAll(memberPubspec.dependencies);
+    }
+    if (dependencyTypes.contains('direct-dev')) {
+      dependencies.addAll(memberPubspec.devDependencies);
+    }
+
+    // Handle nested workspaces recursively
+    if (memberPubspec.isWorkspaceRoot) {
+      final nestedDeps = _collectWorkspaceDependencies(
+        pubspec: memberPubspec,
+        targetDirectory: memberDirectory,
+        dependencyTypes: dependencyTypes,
+      );
+      if (nestedDeps != null) {
+        dependencies.addAll(nestedDeps);
+      }
+    }
+  }
+
+  return dependencies;
+}

lib/src/pubspec/pubspec.dart

@@ -0,0 +1,206 @@
+/// A simple parser for pubspec.yaml files.
+///
+/// This is used by the `packages check licenses` command to detect workspace
+/// configurations and collect dependencies from workspace members.
+library;
+
+import 'dart:collection';
+import 'dart:io';
+
+import 'package:glob/glob.dart';
+import 'package:glob/list_local_fs.dart';
+import 'package:path/path.dart' as path;
+import 'package:yaml/yaml.dart';
+
+/// {@template PubspecParseException}
+/// Thrown when a [Pubspec] fails to parse.
+/// {@endtemplate}
+class PubspecParseException implements Exception {
+  /// {@macro PubspecParseException}
+  const PubspecParseException([this.message]);
+
+  /// The error message.
+  final String? message;
+
+  @override
+  String toString() => message != null
+      ? 'PubspecParseException: $message'
+      : 'PubspecParseException';
+}
+
+/// {@template Pubspec}
+/// A representation of a pubspec.yaml file.
+/// {@endtemplate}
+class Pubspec {
+  const Pubspec._({
+    required this.name,
+    required this.dependencies,
+    required this.devDependencies,
+    required this.workspace,
+    required this.resolution,
+  });
+
+  /// Parses a [Pubspec] from a string.
+  ///
+  /// Throws a [PubspecParseException] if the string cannot be parsed.
+  factory Pubspec.fromString(String content) {
+    late final YamlMap yaml;
+    try {
+      yaml = loadYaml(content) as YamlMap;
+      // loadYaml throws TypeError when it fails to cast content as a YamlMap.
+      // YamlException is thrown when the content is not valid YAML.
+      // We need to catch both to provide a meaningful exception.
+      // ignore: avoid_catching_errors
+    } on TypeError catch (_) {
+      throw const PubspecParseException('Failed to parse YAML content');
+    } on YamlException catch (_) {
+      throw const PubspecParseException('Failed to parse YAML content');
+    }
+
+    final name = yaml['name'] as String? ?? '';
+
+    final dependencies = _parseDependencies(yaml['dependencies']);
+    final devDependencies = _parseDependencies(yaml['dev_dependencies']);
+
+    final workspaceValue = yaml['workspace'];
+    List<String>? workspace;
+    if (workspaceValue is YamlList) {
+      workspace = workspaceValue.cast<String>().toList();
+    }
+
+    final resolutionValue = yaml['resolution'];
+    PubspecResolution? resolution;
+    if (resolutionValue is String) {
+      resolution = PubspecResolution.tryParse(resolutionValue);
+    }
+
+    return Pubspec._(
+      name: name,
+      dependencies: UnmodifiableListView(dependencies),
+      devDependencies: UnmodifiableListView(devDependencies),
+      workspace: workspace != null ? UnmodifiableListView(workspace) : null,
+      resolution: resolution,
+    );
+  }
+
+  /// Parses a [Pubspec] from a file.
+  ///
+  /// Throws a [PubspecParseException] if the file cannot be read or parsed.
+  factory Pubspec.fromFile(File file) {
+    if (!file.existsSync()) {
+      throw PubspecParseException('File not found: ${file.path}');
+    }
+    return Pubspec.fromString(file.readAsStringSync());
+  }
+
+  /// The name of the package.
+  final String name;
+
+  /// The direct main dependencies.
+  final UnmodifiableListView<String> dependencies;
+
+  /// The direct dev dependencies.
+  final UnmodifiableListView<String> devDependencies;
+
+  /// The workspace member paths, if this is a workspace root.
+  ///
+  /// This is `null` if this pubspec is not a workspace root.
+  final UnmodifiableListView<String>? workspace;
+
+  /// The resolution mode for this package.
+  ///
+  /// This is `null` if no resolution is specified (typical for standalone
+  /// packages or workspace roots).
+  final PubspecResolution? resolution;
+
+  /// Whether this pubspec is a workspace root.
+  bool get isWorkspaceRoot => workspace != null;
+
+  /// Whether this pubspec is a workspace member.
+  bool get isWorkspaceMember => resolution == PubspecResolution.workspace;
+
+  /// Resolves workspace member paths to actual directories.
+  ///
+  /// This handles glob patterns in workspace paths (e.g., `packages/*`).
+  /// The [rootDirectory] should be the directory containing this pubspec.
+  ///
+  /// Returns an empty list if this is not a workspace root.
+  List<Directory> resolveWorkspaceMembers(Directory rootDirectory) {
+    if (workspace == null) return [];
+
+    final members = <Directory>[];
+    for (final pattern in workspace!) {
+      if (_isGlobPattern(pattern)) {
+        // Handle glob patterns
+        final glob = Glob(pattern);
+        final matches = glob.listSync(root: rootDirectory.path);
+        for (final match in matches) {
+          if (match is Directory) {
+            final pubspecFile = File(path.join(match.path, 'pubspec.yaml'));
+            if (pubspecFile.existsSync()) {
+              members.add(Directory(match.path));
+            }
+          } else if (match is File &&
+              path.basename(match.path) == 'pubspec.yaml') {
+            members.add(Directory(match.parent.path));
+          }
+        }
+      } else {
+        // Handle direct path
+        final memberPath = path.join(rootDirectory.path, pattern);
+        final memberDir = Directory(memberPath);
+        if (memberDir.existsSync()) {
+          members.add(memberDir);
+        }
+      }
+    }
+
+    return members;
+  }
+}
+
+/// Parses dependency names from a YAML dependencies map.
+List<String> _parseDependencies(Object? value) {
+  if (value == null) return [];
+  if (value is! YamlMap) return [];
+
+  return value.keys.cast<String>().toList();
+}
+
+/// Checks if a path pattern contains glob characters.
+bool _isGlobPattern(String pattern) {
+  return pattern.contains('*') ||
+      pattern.contains('?') ||
+      pattern.contains('[') ||
+      pattern.contains('{');
+}
+
+/// {@template PubspecResolution}
+/// The resolution mode for a pubspec.
+/// {@endtemplate}
+enum PubspecResolution {
+  /// This package is a workspace member and should resolve with the workspace
+  /// root.
+  workspace._('workspace'),
+
+  /// This package uses external resolution (e.g., Dart SDK packages).
+  external._('external'),
+  ;
+
+  const PubspecResolution._(this.value);
+
+  /// Tries to parse a [PubspecResolution] from a string.
+  ///
+  /// Returns `null` if the string is not a valid resolution value.
+  static PubspecResolution? tryParse(String value) {
+    for (final resolution in PubspecResolution.values) {
+      if (resolution.value == value) {
+        return resolution;
+      }
+    }
+    return null;
+  }
+
+  /// The string representation as it appears in pubspec.yaml.
+  final String value;
+}