feature #29865 [Console] Added suggestions for missing packages (prze…

…myslaw-bogusz)

This PR was squashed before being merged into the 4.3-dev branch (closes #29865).

Discussion
----------

[Console] Added suggestions for missing packages

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Currently, when someone runs one of the most common commands, e.g. `server:run`, but does not have a required package installed, they will get a general **'There are no commands defined...'** message.

This commit adds a more useful message, informing the user about a package that might be missing and suggesting a command that should be run in order to install it, e.g. `composer require symfony/web-server-bundle --dev`.

Commits
-------

423a54f [Console] Added suggestions for missing packages

src/Symfony/Bundle/FrameworkBundle/EventListener/SuggestMissingPackageSubscriber.php

@@ -0,0 +1,83 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\EventListener;
+
+use Symfony\Component\Console\ConsoleEvents;
+use Symfony\Component\Console\Event\ConsoleErrorEvent;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Suggests a package, that should be installed (via composer),
+ * if the package is missing, and the input command namespace can be mapped to a Symfony bundle.
+ *
+ * @author Przemysław Bogusz <przemyslaw.bogusz@tubotax.pl>
+ *
+ * @internal
+ */
+final class SuggestMissingPackageSubscriber implements EventSubscriberInterface
+{
+    private const PACKAGES = [
+        'doctrine' => [
+            'fixtures' => ['DoctrineFixturesBundle', 'doctrine/doctrine-fixtures-bundle --dev'],
+            'mongodb' => ['DoctrineMongoDBBundle', 'doctrine/mongodb-odm-bundle'],
+            '_default' => ['Doctrine ORM', 'symfony/orm-pack'],
+        ],
+        'generate' => [
+            '_default' => ['SensioGeneratorBundle', 'sensio/generator-bundle'],
+        ],
+        'make' => [
+            '_default' => ['MakerBundle', 'symfony/maker-bundle --dev'],
+        ],
+        'server' => [
+            'dump' => ['VarDumper Component', 'symfony/var-dumper --dev'],
+            '_default' => ['WebServerBundle', 'symfony/web-server-bundle --dev'],
+        ],
+    ];
+
+    public function onConsoleError(ConsoleErrorEvent $event): void
+    {
+        if (!$event->getError() instanceof CommandNotFoundException) {
+            return;
+        }
+
+        [$namespace, $command] = explode(':', $event->getInput()->getFirstArgument()) + [1 => ''];
+
+        if (!isset(self::PACKAGES[$namespace])) {
+            return;
+        }
+
+        if (isset(self::PACKAGES[$namespace][$command])) {
+            $suggestion = self::PACKAGES[$namespace][$command];
+            $exact = true;
+        } else {
+            $suggestion = self::PACKAGES[$namespace]['_default'];
+            $exact = false;
+        }
+
+        $error = $event->getError();
+
+        if ($error->getAlternatives() && !$exact) {
+            return;
+        }
+
+        $message = sprintf("%s\n\nYou may be looking for a command provided by the \"%s\" which is currently not installed. Try running \"composer require %s\".", $error->getMessage(), $suggestion[0], $suggestion[1]);
+        $event->setError(new CommandNotFoundException($message));
+    }
+
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            ConsoleEvents::ERROR => ['onConsoleError', 0],
+        ];
+    }
+}

src/Symfony/Bundle/FrameworkBundle/Resources/config/console.xml

@@ -13,6 +13,10 @@
             <tag name="monolog.logger" channel="console" />
         </service>
 
+        <service id="console.suggest_missing_package_subscriber" class="Symfony\Bundle\FrameworkBundle\EventListener\SuggestMissingPackageSubscriber">
+            <tag name="kernel.event_subscriber" />
+        </service>
+
         <service id="console.command.about" class="Symfony\Bundle\FrameworkBundle\Command\AboutCommand">
             <tag name="console.command" command="about" />
         </service>

src/Symfony/Bundle/FrameworkBundle/Tests/Console/ApplicationTest.php

@@ -12,8 +12,11 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Console;
 
 use Symfony\Bundle\FrameworkBundle\Console\Application;
+use Symfony\Bundle\FrameworkBundle\EventListener\SuggestMissingPackageSubscriber;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Event\ConsoleErrorEvent;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
 use Symfony\Component\Console\Input\ArrayInput;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\NullOutput;
@@ -226,6 +229,34 @@ public function testRunOnlyWarnsOnUnregistrableCommandAtTheEnd()
         $this->assertContains(trim('[WARNING] Some commands could not be registered:'), trim($display[1]));
     }
 
+    public function testSuggestingPackagesWithExactMatch()
+    {
+        $result = $this->createEventForSuggestingPackages('server:dump', []);
+        $this->assertRegExp('/You may be looking for a command provided by/', $result);
+    }
+
+    public function testSuggestingPackagesWithPartialMatchAndNoAlternatives()
+    {
+        $result = $this->createEventForSuggestingPackages('server', []);
+        $this->assertRegExp('/You may be looking for a command provided by/', $result);
+    }
+
+    public function testSuggestingPackagesWithPartialMatchAndAlternatives()
+    {
+        $result = $this->createEventForSuggestingPackages('server', ['server:run']);
+        $this->assertNotRegExp('/You may be looking for a command provided by/', $result);
+    }
+
+    private function createEventForSuggestingPackages(string $command, array $alternatives = []): string
+    {
+        $error = new CommandNotFoundException('', $alternatives);
+        $event = new ConsoleErrorEvent(new ArrayInput([$command]), new NullOutput(), $error);
+        $subscriber = new SuggestMissingPackageSubscriber();
+        $subscriber->onConsoleError($event);
+
+        return $event->getError()->getMessage();
+    }
+
     private function getKernel(array $bundles, $useDispatcher = false)
     {
         $container = $this->getMockBuilder('Symfony\Component\DependencyInjection\ContainerInterface')->getMock();