diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/Console/Shell.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/Console/Shell.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,136 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Console;
+
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Input\StringInput;
+use Symfony\Component\Console\Output\ConsoleOutput;
+
+/**
+ * A Shell wraps an Application to add shell capabilities to it.
+ *
+ * This class only works with a PHP compiled with readline support
+ * (either --with-readline or --with-libedit)
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Shell
+{
+    private $application;
+    private $history;
+    private $output;
+
+    /**
+     * Constructor.
+     *
+     * If there is no readline support for the current PHP executable
+     * a \RuntimeException exception is thrown.
+     *
+     * @param Application $application An application instance
+     *
+     * @throws \RuntimeException When Readline extension is not enabled
+     */
+    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();
+    }
+
+    /**
+     * Runs the shell.
+     */
+    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));
+            }
+        }
+    }
+
+    /**
+     * Tries to return autocompletion for the current entered text.
+     *
+     * @param string  $text     The last segment of the entered text
+     * @param integer $position The current position
+     */
+    private function autocompleter($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 = $this->application->find(substr($text, 0, strpos($text, ' ')));
+        } catch (\Exception $e) {
+            return true;
+        }
+
+        $list = array('--help');
+        foreach ($command->getDefinition()->getOptions() as $option) {
+            $list[] = '--'.$option->getName();
+        }
+
+        return $list;
+    }
+
+    /**
+     * Returns the shell header.
+     *
+     * @return string The header string
+     */
+    protected function getHeader()
+    {
+        return <<<EOF
+
+Welcome to the <info>{$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;
+    }
+}