backupscript/src/CommandShow.php

<?php
namespace App;

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Style\SymfonyStyle;

use Symfony\Component\Yaml\Yaml;
use Symfony\Component\Yaml\Exception\ParseException;

class CommandShow extends Command
{
    static $defaultName = "show";
    static $defaultDescription = "Show all backup entries";

    protected function configure(): void
    {
        $this->addArgument('config', InputArgument::OPTIONAL, 'Configuration file', "config.yml");
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $io = new SymfonyStyle($input, $output);
        $io->title('List backup entities');

        try {
            $app = new App($input->getArgument('config'));
        }
        catch (\Throwable $e) {
            $io->error('Unable to parse the YAML string: '. $e->getMessage());
            return Command::FAILURE;
        }

        $io->table(['Description', 'Source', 'Destination'], $app->getConfig()['backup']);

        $io->success("Done");
        return Command::SUCCESS;
    }
}