Shell.php

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<?php
 
namespace Symfony\Component\Console;
 
use Symfony\Component\Console\Application;
use Symfony\Component\Console\Input\StringInput;
use Symfony\Component\Console\Output\ConsoleOutput;
 
/*
 * This file is part of the Symfony framework.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */
 
class Shell
{
    protected $application;
    protected $history;
    protected $output;
 
    public function __construct(Application $application)
    {
        if (!function_exists('readline')) {
            throw new \RuntimeException('Unable to start the shell as the Readline extension is not enabled.');
        }
 
        $this->application = $application;
        $this->history = getenv('HOME').'/.history_'.$application->getName();
        $this->output = new ConsoleOutput();
    }
 
    public function run()
    {
        $this->application->setAutoExit(false);
        $this->application->setCatchExceptions(true);
 
        readline_read_history($this->history);
        readline_completion_function(array($this, 'autocompleter'));
 
        $this->output->writeln($this->getHeader());
        while (true) {
            $command = readline($this->application->getName().' > ');
 
            if (false === $command) {
                $this->output->writeln("\n");
 
                break;
            }
 
            readline_add_history($command);
            readline_write_history($this->history);
 
            if (0 !== $ret = $this->application->run(new StringInput($command), $this->output)) {
                $this->output->writeln(sprintf('<error>The command terminated with an error status (%s)</error>', $ret));
            }
        }
    }
 
    protected function autocompleter($text, $position)
    {
        $info = readline_info();
        $text = substr($info['line_buffer'], 0, $info['end']);
 
        if ($info['point'] !== $info['end']) {
            return true;
        }
 
        // task name?
        if (false === strpos($text, ' ') || !$text) {
            return array_keys($this->application->all());
        }
 
        // options and arguments?
        try {
            $command = $this->application->findCommand(substr($text, 0, strpos($text, ' ')));
        } catch (\Exception $e) {
            return true;
        }
 
        $list = array('--help');
        foreach ($command->getDefinition()->getOptions() as $option) {
            $list[] = '--'.$option->getName();
        }
 
        return $list;
    }
 
    protected function getHeader()
    {
        return <<<EOF
 
Welcome to the <info>{$this->application->getName()}</info> shell (<comment>{$this->application->getVersion()}</comment>).
 
At the prompt, type <comment>help</comment> for some help,
or <comment>list</comment> to get a list available commands.
 
To exit the shell, type <comment>^D</comment>.
 
EOF;
    }
}