Final Project: Wiki Explorer Pro

getArticle(String title) async { await _simulateDelay(); final url = Uri.parse( '$_baseUrl/api/rest_v1/page/html/${Uri.encodeComponent(title)}', ); final response = await http.get(url); if (response.statusCode == 404) { throw ArticleNotFoundException(title); } else if (response.statusCode != 200) { throw ApiException('Failed to fetch article: ${response.statusCode}'); } return Article.fromJson(jsonDecode(response.body)); } Future _simulateDelay() async { await Future.delayed(Duration(milliseconds: 200 + _random.nextInt(300))); } } class ApiException implements Exception { final String message; ApiException(this.message); @override String toString() => 'ApiException: $message'; } class ArticleNotFoundException implements Exception { final String title; ArticleNotFoundException(this.title); @override String toString() => 'Article not found: $title'; } name: cli description: Wiki Explorer Pro CLI. version: 1.0.0 resolution: workspace environment: sdk: ^3.12.0 dependencies: command_runner: path: ../command_runner wikipedia: path: ../wikipedia logging: ^1.2.0 import 'dart:io'; import 'package:logging/logging.dart'; Logger setupLogger(String name) { hierarchicalLoggingEnabled = true; final logger = Logger(name); logger.level = Level.ALL; final now = DateTime.now(); final dir = Directory('logs'); if (!dir.existsSync()) dir.createSync(); final logFile = File('${dir.path}/${now.year}_${now.month}_${now.day}_$name.log'); logger.onRecord.listen((record) { final msg = '[${record.time}] ${record.level.name}: ${record.loggerName}: ${record.message}'; logFile.writeAsStringSync('$msg\n', mode: FileMode.append); if (record.level >= Level.WARNING) print(msg); }); return logger; } import 'dart:async'; import 'package:command_runner/command_runner.dart'; import 'package:wikipedia/wikipedia.dart'; import 'package:logging/logging.dart'; class SearchCommand extends Command { final WikipediaClient client; final Logger logger; SearchCommand(this.client, this.logger) : super('search', 'Search Wikipedia articles') { addOption(Option('limit', 'Max results (1-10)', isFlag: false)); } @override Future run(ArgResults args) async { if (args.commandArg == null || args.commandArg!.isEmpty) { return 'Usage: search [--limit N]'; } int limit = int.tryParse(args.options['limit'] ?? '5') ?? 5; limit = limit.clamp(1, 10); logger.info('Searching for: ${args.commandArg}'); final stopwatch = Stopwatch()..start(); try { final results = await client.search(args.commandArg!); stopwatch.stop(); final buffer = StringBuffer('🔍 Search results for "${args.commandArg}":\n'); final display = results.take(limit).toList(); for (int i = 0; i < display.length; i++) { buffer.writeln('${i + 1}. ${display[i].title} - ${display[i].url}'); } buffer.writeln('✅ Search completed in ${stopwatch.elapsedMilliseconds}ms'); return buffer.toString(); } catch (e) { logger.severe('Search failed: $e'); return '❌ Search error: $e'; } } } class SummaryCommand extends Command { final WikipediaClient client; final Logger logger; SummaryCommand(this.client, this.logger) : super('summary', 'Get article summary'); @override Future run(ArgResults args) async { if (args.commandArg == null || args.commandArg!.isEmpty) { return 'Usage: summary '; } try { final summary = await client.getSummary(args.commandArg!); logger.info('Fetched summary for: ${summary.title}'); final buffer = StringBuffer('📖 ${summary.title}\n'); buffer.writeln('─' * 50); buffer.writeln(summary.extract); buffer.writeln('─' * 50); if (summary.url != null) buffer.writeln('🔗 ${summary.url}'); return buffer.toString(); } on ArticleNotFoundException { return '❌ Article not found: ${args.commandArg}'; } catch (e) { logger.severe('Summary error: $e'); return '❌ Error: $e'; } } }    class CompareCommand extends Command { final WikipediaClient client; final Logger logger; CompareCommand(this.client, this.logger) : super('compare', 'Compare two articles'); @override Future<string> run(ArgResults args) async { final titles = args.commandArg?.split(',') ?? []; if (titles.length != 2) { return 'Usage: compare <title1>,<title2>'; } try { final results = await Future.wait([ client.getSummary(titles[0].trim()), client.getSummary(titles[1].trim()), ]); final a = results[0], b = results[1]; final buffer = StringBuffer('📊 Comparing "${a.title}" vs "${b.title}"\n'); buffer.writeln('─' * 50); buffer.writeln('${a.title.padRight(20)} | ${b.title}'); buffer.writeln('─' * 50); buffer.writeln('${(a.description ?? 'N/A').padRight(20)} | ${b.description ?? 'N/A'}'); buffer.writeln('Extract length: ${a.extract.length.toString().padRight(20)} | ${b.extract.length}'); return buffer.toString(); } catch (e) { logger.severe('Compare error: $e'); return '❌ Compare error: $e'; } } }    import 'dart:convert'; import 'dart:io'; class ExportCommand extends Command { final WikipediaClient client; final Logger logger; ExportCommand(this.client, this.logger) : super('export', 'Export article to JSON'); @override Future<string> run(ArgResults args) async { if (args.commandArg == null || args.commandArg!.isEmpty) { return 'Usage: export <title>'; } try { final summary = await client.getSummary(args.commandArg!); final json = jsonEncode({ 'title': summary.title, 'extract': summary.extract, 'description': summary.description, 'url': summary.url, }); final filename = '${args.commandArg!.replaceAll(' ', '_')}.json'; File(filename).writeAsStringSync(json); logger.info('Exported to $filename'); return '✅ Exported to $filename'; } catch (e) { logger.severe('Export error: $e'); return '❌ Export error: $e'; } } }    import 'dart:io'; import 'package:cli/cli.dart'; import 'package:command_runner/command_runner.dart'; import 'package:wikipedia/wikipedia.dart'; void main(List<string> arguments) async { final logger = setupLogger('wiki_cli'); final client = WikipediaClient(); final runner = CommandRunner() ..addCommand(SearchCommand(client, logger)) ..addCommand(SummaryCommand(client, logger)) ..addCommand(CompareCommand(client, logger)) ..addCommand(ExportCommand(client, logger)); if (arguments.isEmpty) { // Interactive mode print('🏆 Wiki Explorer Pro (type "help" for commands, "exit" to quit)'); while (true) { stdout.write('\nwiki> '); final line = stdin.readLineSync(); if (line == null || line.trim().toLowerCase() == 'exit') break; await runner.run(line.trim().split(' ')); } } else { await runner.run(arguments); } } </string>

🏆 Final Project: Wiki Explorer Pro

Build a Complete Wikipedia CLI Application

🎯 Project Overview

📋 Detailed Requirements

1. Command Runner Package

2. Wikipedia Package

3. CLI Application

4. Testing

📺 Expected Behavior

✨ Ready for the next level?

🧪 Testing Requirements