Console Clear - Symfony Console Component

Question

I'm writing a console app using Symfony 2 Console Component, and I want to run a console clear command before (or as) the first line of my app.

I have done some research and am struggling to find if this is possible.

Answer 1

I have been looking for similar functionality. There is nothing built-in to the symfony console that can clear the screen as far as I can tell, but you can still achieve the clear behavior by using the escape code for resetting the terminal like so:

$output->write(sprintf("\033\143"));

See the post "Clear the Ubuntu bash screen for real" and "What commands can I use to reset and clear my terminal?" for a more extensive explanation of the codes, and this symfony console pull request, where I got the code from, that attempted to emulate the clear functionality.

Answer 2

As the doc says, you can use something like this:

    $kernel = $this->getContainer()->get('kernel');
    $application = new Application($kernel);
    $application->setAutoExit(false);

    $input = new ArrayInput(array(
       'command' => 'cache:clear',
    ));
    // You can use NullOutput() if you don't need the output
    $output = new BufferedOutput();
    $application->run($input, $output);

    // return the output, don't use if you used NullOutput()
    $content = $output->fetch();

As your are using a command, your command must extends ContainerAwareCommand so you can access the container and your services.