A single file CLI app for Composer-based applications

composer.json

{
    "name": "pretzelhands/single-file-cli",
    "description": "A single file CLI application",
    "type": "cli-app",
    "require": {
        "symfony/console": "^5.2"
    },
    "authors": [
        {
            "name": "Richard Blechinger",
            "email": "hello@pretzelhands.com"
        }
    ],
}

joke-fetcher.php

#!/usr/bin/env php

<?php

require __DIR__ . '/vendor/autoload.php';

use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\SingleCommandApplication;

const JOKE_API_ENDPOINT = 'https://official-joke-api.appspot.com/jokes/%s/random';

function command(InputInterface $input, OutputInterface $output)
{
    $topic = $input->getOption('topic');
    $jokeResponse = file_get_contents(sprintf(JOKE_API_ENDPOINT, $topic));
    [$joke] = json_decode($jokeResponse);

    $output->writeln($joke->setup);
    $output->writeln("<info>{$joke->punchline}</info>\n");
}

(new SingleCommandApplication())
    ->setName('Joke Fetcher')
    ->addOption(
        name: 'topic',
        mode: InputOption::VALUE_OPTIONAL,
        default: 'general'
    )
    ->setCode('command')
    ->run();