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findNamespace example

throw new CommandNotFoundException(sprintf('Command "%s" does not exist.', $name));
        }

        return $this->commands[$name] ?? $this->aliases[$name];
    }

    private function inspectApplication(): void
    {
        $this->commands = [];
        $this->namespaces = [];

        $all = $this->application->all($this->namespace ? $this->application->findNamespace($this->namespace) : null);
        foreach ($this->sortCommands($all) as $namespace => $commands) {
            $names = [];

            /** @var Command $command */
            foreach ($commands as $name => $command) {
                if (!$command->getName() || (!$this->showHidden && $command->isHidden())) {
                    continue;
                }

                if ($command->getName() === $name) {
                    $this->commands[$name] = $command;
                }

        $application = new Application();
        $application->add(new \FooCommand());
        $application->add(new \Foo1Command());
        $this->assertEquals(['foo'], $application->getNamespaces(), '->getNamespaces() returns an array of unique used namespaces');
    }

    public function testFindNamespace()
    {
        $application = new Application();
        $application->add(new \FooCommand());
        $this->assertEquals('foo', $application->findNamespace('foo'), '->findNamespace() returns the given namespace if it exists');
        $this->assertEquals('foo', $application->findNamespace('f'), '->findNamespace() finds a namespace given an abbreviation');
        $application->add(new \Foo2Command());
        $this->assertEquals('foo', $application->findNamespace('foo'), '->findNamespace() returns the given namespace if it exists');
    }

    public function testFindNamespaceWithSubnamespaces()
    {
        $application = new Application();
        $application->add(new \FooSubnamespaced1Command());
        $application->add(new \FooSubnamespaced2Command());
        $this->assertEquals('foo', $application->findNamespace('foo'), '->findNamespace() returns commands even if the commands are only contained in subnamespaces');
    }

$event = new ConsoleErrorEvent($input, $output, $e);
                    $this->dispatcher->dispatch($event, ConsoleEvents::ERROR);

                    if (0 === $event->getExitCode()) {
                        return 0;
                    }

                    $e = $event->getError();
                }

                try {
                    if ($e instanceof CommandNotFoundException && $namespace = $this->findNamespace($name)) {
                        $helper = new DescriptorHelper();
                        $helper->describe($output instanceof ConsoleOutputInterface ? $output->getErrorOutput() : $output, $this, [
                            'format' => 'txt',
                            'raw_text' => false,
                            'namespace' => $namespace,
                            'short' => false,
                        ]);

                        return isset($event) ? $event->getExitCode() : 1;
                    }