Add debug command

README.md

@@ -21,7 +21,7 @@ All you need is to use any [PSR-11](https://www.php-fig.org/psr/psr-11/) compati
 
 ## Requirements
 
-- PHP 8.0 or higher.
+- PHP 8.1 or higher.
 
 ## Installation
 
@@ -35,7 +35,7 @@ composer require yiisoft/yii-event
 
 ### DI configuration
 
-You can find default configuration in the [config directory](config):
+You can find the default configuration in the [config directory](config):
 
 - [di.php](config/di.php) contains the configuration for the [PSR-14](https://www.php-fig.org/psr/psr-14/) interfaces.
 - [di-web.php](config/di-web.php) and [di-console.php](config/di-consle.php) contains the configuration for the `Yiisoft\EventDispatcher\Provider\ListenerCollection`.
@@ -73,13 +73,13 @@ return [
         // they will be resolved the same way as in the previous example.
         [SomeClass::class, 'staticMethodName'],
 
-        // Non-static methods are allowed too. In this case `SomeClass` will be instantiated by your DI container.
+        // Non-static methods are allowed too. In this case, `SomeClass` will be instantiated by your DI container.
         [SomeClass::class, 'methodName'],
 
         // An object of a class with the `__invoke` method implemented
         new InvokableClass(),
 
-        // In this case the `InvokableClass` with the `__invoke` method will be instantiated by your DI container
+        // In this case, the `InvokableClass` with the `__invoke` method will be instantiated by your DI container
         InvokableClass::class,
 
         // Any definition of an invokable class may be here while your `$container->has('the definition)` 
@@ -89,11 +89,11 @@ return [
 ```
 
 The dependency resolving is done in a lazy way: dependencies will not be resolved before the corresponding event
-will happen.
+happens.
 
 ### Configuration checker
 
-To help you with event listener configuration validation there is the `ListenerConfigurationChecker`. It is converting
+To help you with event listener configuration validation, there is the `ListenerConfigurationChecker`. It is converting
 your whole listener config to actual callables at once to validate it. It is intended to be used in development environment
 or in tests since it is a resource greedy operation in large projects. An `InvalidEventConfigurationFormatException`
 will be thrown if your configuration contains an invalid listener.
@@ -104,6 +104,11 @@ Usage example:
 $checker->check($configuration->get('events-web'));
 ```
 
+## Event configuration debugging
+
+If you use the package with Yii3, `./yii debug:events` command is available.
+It shows information about events and listeners. 
+
 ## Documentation
 
 - [Internals](docs/internals.md)

composer.json

@@ -27,11 +27,13 @@
         }
     ],
     "require": {
-        "php": "^8.0",
+        "php": "^8.1",
         "psr/container": "^1.0|^2.0",
         "yiisoft/event-dispatcher": "^1.0",
         "yiisoft/friendly-exception": "^1.0",
-        "yiisoft/injector": "^1.0"
+        "yiisoft/injector": "^1.0",
+        "symfony/console": "^5.4|^6.0",
+        "symfony/var-dumper": "^5.4|^6.4"
     },
     "require-dev": {
         "maglnet/composer-require-checker": "^4.4",

config/params-console.php

@@ -2,8 +2,18 @@
 
 declare(strict_types=1);
 
+use Yiisoft\Yii\Event\Command\DebugEventsCommand;
+
 return [
     'yiisoft/yii-event' => [
         'eventsConfigGroup' => 'events-console',
     ],
+    'yiisoft/yii-debug' => [
+        'ignoredCommands' => [
+            'debug:events',
+        ],
+    ],
+    'yiisoft/yii-console' => [
+        'debug:events' => DebugEventsCommand::class,
+    ]
 ];

src/Command/DebugEventsCommand.php

@@ -0,0 +1,124 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Yii\Event\Command;
+
+use Psr\Container\ContainerInterface;
+use ReflectionClass;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Helper\Table;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+use Symfony\Component\VarDumper\VarDumper as SymfonyVarDumper;
+use Yiisoft\Config\ConfigInterface;
+use Yiisoft\VarDumper\VarDumper;
+
+#[AsCommand(
+    name: 'debug:events',
+    description: 'Show information about events and listeners',
+)]
+final class DebugEventsCommand extends Command
+{
+    public function __construct(
+        private readonly ContainerInterface $container,
+    ) {
+        parent::__construct();
+    }
+
+    protected function configure(): void
+    {
+        $this
+            ->addArgument('id', InputArgument::IS_ARRAY, 'Service ID')
+            ->addOption('groups', null, InputOption::VALUE_NONE, 'Show groups')
+            ->addOption('group', 'g', InputOption::VALUE_REQUIRED, 'Show group');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $config = $this->container->get(ConfigInterface::class);
+
+        $io = new SymfonyStyle($input, $output);
+
+        if ($input->hasOption('groups') && $input->getOption('groups')) {
+            $build = $this->getConfigBuild($config);
+            $groups = array_keys($build);
+            sort($groups);
+
+            $io->table(['Groups'], array_map(static fn ($group) => [$group], $groups));
+
+            return self::SUCCESS;
+        }
+        if ($input->hasOption('group') && !empty($group = $input->getOption('group'))) {
+            $data = $config->get($group);
+            ksort($data);
+            $table = new Table($output);
+
+            foreach ($data as $event => $listeners) {
+                $io->title($event);
+                foreach ($listeners as $listener) {
+                    if (is_callable($listener) && !is_array($listener)) {
+                        SymfonyVarDumper::dump($this->export($listener));
+                    } else {
+                        SymfonyVarDumper::dump($listener);
+                    }
+                }
+                $table->render();
+                $io->newLine();
+            }
+            return self::SUCCESS;
+        }
+
+        $data = [];
+        if ($config->has('events')) {
+            $data = array_merge($data, $config->get('events'));
+        }
+        if ($config->has('events-console')) {
+            $data = array_merge($data, $config->get('events-console'));
+        }
+        $rows = [];
+        foreach ($data as $event => $listeners) {
+            $rows[] = [
+                $event,
+                is_countable($listeners) ? count($listeners) : 0,
+                implode(
+                    "\n",
+                    array_map(function (mixed $listener) {
+                        if (is_array($listener)) {
+                            return sprintf(
+                                '%s::%s',
+                                $listener[0],
+                                $listener[1]
+                            );
+                        }
+                        return $this->export($listener);
+                    }, $listeners)
+                ),
+            ];
+        }
+        $table = new Table($output);
+        $table
+            ->setHeaders(['Event', 'Count', 'Listeners'])
+            ->setRows($rows);
+        $table->render();
+
+        return self::SUCCESS;
+    }
+
+    private function getConfigBuild(mixed $config): array
+    {
+        $reflection = new ReflectionClass($config);
+        $buildReflection = $reflection->getProperty('build');
+        $buildReflection->setAccessible(true);
+        return $buildReflection->getValue($config);
+    }
+
+    protected function export(mixed $value): string
+    {
+        return VarDumper::create($value)->asString();
+    }
+}

tests/Command/DebugEventsCommandTest.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Yiisoft\Yii\Event\Tests\Command;
+
+use PHPUnit\Framework\TestCase;
+use Psr\Container\ContainerInterface;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+use Symfony\Component\Console\Tester\CommandTester;
+use Yiisoft\Config\Config;
+use Yiisoft\Config\ConfigInterface;
+use Yiisoft\Config\ConfigPaths;
+use Yiisoft\Di\Container;
+use Yiisoft\Di\ContainerConfig;
+use Yiisoft\Yii\Event\Command\DebugEventsCommand;
+
+final class DebugEventsCommandTest extends TestCase
+{
+    public function testCommand(): void
+    {
+        $container = $this->createContainer();
+        $command = new DebugEventsCommand($container);
+        $commandTester = new CommandTester($command);
+        $commandTester->execute([]);
+
+        $commandTester->assertCommandIsSuccessful();
+        $output = $commandTester->getDisplay();
+        $this->assertStringContainsString('Listeners', $output);
+    }
+
+    private function createContainer(): ContainerInterface
+    {
+        $config = ContainerConfig::create()
+            ->withDefinitions([
+                LoggerInterface::class => NullLogger::class,
+                ConfigInterface::class => [
+                    'class' => Config::class,
+                    '__construct()' => [
+                        new ConfigPaths(__DIR__ . '/config'),
+                    ],
+                ],
+            ]);
+        return new Container($config);
+    }
+}

tests/Command/config/.merge-plan.php

@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    '/'=>[
+        'params' => [
+
+        ]
+    ],
+];

tests/Command/config/param1.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    '/' => [
+        'params' => [
+            'yiitest/yii-debug' => [
+                'param1.php',
+            ],
+        ],
+    ],
+];