feature #10989 Template events system - CLI command for debugging (pamil)

This PR was merged into the 1.7-dev branch.

Discussion
----------

| Q               | A
| --------------- | -----
| Branch?         | master
| Bug fix?        | no
| New feature?    | yes
| BC breaks?      | no
| Deprecations?   | no
| Related tickets | related to #10924
| License         | MIT

Added `sylius:debug:template-event` command:
<img width="956" alt="Screenshot 2019-12-27 at 17 49 07" src="https://user-images.githubusercontent.com/1897953/71530171-c15f6680-28e8-11ea-9978-a45a49b5daa4.png">



Commits
-------

4b969d3fcd Add a command to debug template events

src/Sylius/Bundle/UiBundle/Command/DebugTemplateEventCommand.php

@@ -0,0 +1,78 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Paweł Jędrzejewski
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Sylius\Bundle\UiBundle\Command;
+
+use Sylius\Bundle\UiBundle\Registry\TemplateBlock;
+use Sylius\Bundle\UiBundle\Registry\TemplateBlockRegistryInterface;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+final class DebugTemplateEventCommand extends Command
+{
+    protected static $defaultName = 'sylius:debug:template-event';
+
+    /** @var TemplateBlockRegistryInterface */
+    private $templateBlockRegistry;
+
+    public function __construct(TemplateBlockRegistryInterface $templateBlockRegistry)
+    {
+        parent::__construct();
+
+        $this->templateBlockRegistry = $templateBlockRegistry;
+    }
+
+    protected function configure(): void
+    {
+        $this
+            ->setDescription('Debug template events and associated blocks')
+            ->addArgument('event', InputArgument::OPTIONAL, 'Template event name', null)
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $io = new SymfonyStyle($input, $output);
+        $eventName = $input->getArgument('event');
+
+        if ($eventName === null) {
+            $io->title('List of template events');
+
+            $io->listing(array_keys($this->templateBlockRegistry->all()));
+
+            return 0;
+        }
+
+        $io->title(sprintf('Blocks registered for the template event "%s"', $eventName));
+
+        $io->table(
+            ['Block name', 'Template', 'Priority', 'Enabled'],
+            array_map(
+                static function (TemplateBlock $templateBlock): array {
+                    return [
+                        $templateBlock->getName(),
+                        $templateBlock->getTemplate(),
+                        $templateBlock->getPriority(),
+                        $templateBlock->isEnabled() ? 'TRUE' : 'FALSE',
+                    ];
+                },
+                $this->templateBlockRegistry->all()[$eventName] ?? []
+            )
+        );
+
+        return 0;
+    }
+}

src/Sylius/Bundle/UiBundle/Resources/config/services/template_event.xml

@@ -26,5 +26,10 @@
             <argument type="service" id="Sylius\Bundle\UiBundle\Registry\TemplateBlockRegistryInterface" />
             <argument type="service" id="Sylius\Bundle\UiBundle\Renderer\TemplateBlockRendererInterface" />
         </service>
+
+        <service id="Sylius\Bundle\UiBundle\Command\DebugTemplateEventCommand">
+            <argument type="service" id="Sylius\Bundle\UiBundle\Registry\TemplateBlockRegistryInterface" />
+            <tag name="console.command" command="sylius:debug:template-event" />
+        </service>
     </services>
 </container>