adventofcode/src/Puzzle.php

<?php

namespace AdventOfCode21;

use AdventOfCode21\Utils\SymfonyConsoleMarkdown;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class Puzzle extends Command
{
    protected function configure(): void
    {
        $this
            ->setName('puzzle')
            ->addArgument('day', InputArgument::REQUIRED, 'The day number.');
    }

    /**
     * @return int
     */
    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $contents = file_get_contents(sprintf('%s/../data/day%s/puzzle.md', __DIR__, (int) $input->getArgument('day')));
        $rendered = (new SymfonyConsoleMarkdown())->render($contents);

        $output->writeln($rendered);

        return Command::SUCCESS;
    }
}