Console Commands

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// src/Command/CreateUserCommand.php
namespace App\Command;

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class CreateUserCommand extends Command
{
    // the name of the command (the part after "bin/console")
    protected static $defaultName = 'app:create-user';

    protected function configure(): void
    {
        // ...
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        // ... put here the code to create the user

        // this method must return an integer number with the "exit status code"
        // of the command.

        // return this if there was no problem running the command
        return 0;

        // or return this if some error happened during the execution
        // return 1;
    }
}

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// ...
protected function configure(): void
{
    $this
        // the short description shown while running "php bin/console list"
        ->setDescription('Creates a new user.')

        // the full command description shown when running the command with
        // the "--help" option
        ->setHelp('This command allows you to create a user...')
    ;
}

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// ...
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;

class CreateUserCommand extends Command
{
    // ...

    public function __construct(bool $requirePassword = false)
    {
        // best practices recommend to call the parent constructor first and
        // then set your own properties. That wouldn't work in this case
        // because configure() needs the properties set in this constructor
        $this->requirePassword = $requirePassword;

        parent::__construct();
    }

    protected function configure(): void
    {
        $this
            // ...
            ->addArgument('password', $this->requirePassword ? InputArgument::REQUIRED : InputArgument::OPTIONAL, 'User password')
        ;
    }
}

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// ...
protected function execute(InputInterface $input, OutputInterface $output): int
{
    // outputs multiple lines to the console (adding "\n" at the end of each line)
    $output->writeln([
        'User Creator',
        '============',
        '',
    ]);

    // the value returned by someMethod() can be an iterator (https://php.net/iterator)
    // that generates and returns the messages with the 'yield' PHP keyword
    $output->writeln($this->someMethod());

    // outputs a message followed by a "\n"
    $output->writeln('Whoa!');

    // outputs a message without adding a "\n" at the end of the line
    $output->write('You are about to ');
    $output->write('create a user.');

    return 0;
}

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use Symfony\Component\Console\Input\InputArgument;

// ...
protected function configure(): void
{
    $this
        // configure an argument
        ->addArgument('username', InputArgument::REQUIRED, 'The username of the user.')
        // ...
    ;
}

// ...
public function execute(InputInterface $input, OutputInterface $output): int
{
    $output->writeln([
        'User Creator',
        '============',
        '',
    ]);

    // retrieve the argument value using getArgument()
    $output->writeln('Username: '.$input->getArgument('username'));

    return 0;
}

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// ...
use App\Service\UserManager;
use Symfony\Component\Console\Command\Command;

class CreateUserCommand extends Command
{
    private $userManager;

    public function __construct(UserManager $userManager)
    {
        $this->userManager = $userManager;

        parent::__construct();
    }

    // ...

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        // ...

        $this->userManager->create($input->getArgument('username'));

        $output->writeln('User successfully generated!');

        return 0;
    }
}

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// tests/Command/CreateUserCommandTest.php
namespace App\Tests\Command;

use Symfony\Bundle\FrameworkBundle\Console\Application;
use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
use Symfony\Component\Console\Tester\CommandTester;

class CreateUserCommandTest extends KernelTestCase
{
    public function testExecute()
    {
        $kernel = self::bootKernel();
        $application = new Application($kernel);

        $command = $application->find('app:create-user');
        $commandTester = new CommandTester($command);
        $commandTester->execute([
            // pass arguments to the helper
            'username' => 'Wouter',

            // prefix the key with two dashes when passing options,
            // e.g: '--some-option' => 'option_value',
            // use brackets for testing array value,
            // e.g: '--some-option' => ['option_value'],
        ]);

        // the output of the command in the console
        $output = $commandTester->getDisplay();
        $this->assertStringContainsString('Username: Wouter', $output);

        // ...
    }
}