Building a single Command Application

5.2 version

Maintained

4.4 5.1 5.2 current 5.3 dev

Unmaintained

2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 3.0 3.1 3.2 3.3 3.4 4.0 4.1 4.2 4.3 5.0

edit this page

Building a single Command Application¶

When building a command line tool, you may not need to provide several commands. In such case, having to pass the command name each time is tedious.

New in version 5.1: The Symfony\Component\Console\SingleCommandApplication class was introduced in Symfony 5.1.

Fortunately, it is possible to remove this need by declaring a single command application:

#!/usr/bin/env php
<?php
require __DIR__.'/vendor/autoload.php';

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

(new SingleCommandApplication())
    ->setName('My Super Command') // Optional
    ->setVersion('1.0.0') // Optional
    ->addArgument('foo', InputArgument::OPTIONAL, 'The directory')
    ->addOption('bar', null, InputOption::VALUE_REQUIRED)
    ->setCode(function (InputInterface $input, OutputInterface $output) {
        // output arguments and options
    })
    ->run();

You can still register a command as usual:

#!/usr/bin/env php
<?php
require __DIR__.'/vendor/autoload.php';

use Acme\Command\DefaultCommand;
use Symfony\Component\Console\Application;

$application = new Application('echo', '1.0.0');
$command = new DefaultCommand();

$application->add($command);

$application->setDefaultCommand($command->getName(), true);
$application->run();

The setDefaultCommand() method accepts a boolean as second parameter. If true, the command echo will then always be used, without having to pass its name.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.