diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/Console/Helper/HelperSet.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/Console/Helper/HelperSet.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,102 @@
+<?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\Helper;
+
+use Symfony\Component\Console\Command\Command;
+
+/**
+ * HelperSet represents a set of helpers to be used with a command.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class HelperSet
+{
+    private $helpers;
+    private $command;
+
+    /**
+     * @param Helper[] $helpers An array of helper.
+     */
+    public function __construct(array $helpers = array())
+    {
+        $this->helpers = array();
+        foreach ($helpers as $alias => $helper) {
+            $this->set($helper, is_int($alias) ? null : $alias);
+        }
+    }
+
+    /**
+     * Sets a helper.
+     *
+     * @param HelperInterface $helper The helper instance
+     * @param string          $alias  An alias
+     */
+    public function set(HelperInterface $helper, $alias = null)
+    {
+        $this->helpers[$helper->getName()] = $helper;
+        if (null !== $alias) {
+            $this->helpers[$alias] = $helper;
+        }
+
+        $helper->setHelperSet($this);
+    }
+
+    /**
+     * Returns true if the helper if defined.
+     *
+     * @param string  $name The helper name
+     *
+     * @return Boolean true if the helper is defined, false otherwise
+     */
+    public function has($name)
+    {
+        return isset($this->helpers[$name]);
+    }
+
+    /**
+     * Gets a helper value.
+     *
+     * @param string $name The helper name
+     *
+     * @return HelperInterface The helper instance
+     *
+     * @throws \InvalidArgumentException if the helper is not defined
+     */
+    public function get($name)
+    {
+        if (!$this->has($name)) {
+            throw new \InvalidArgumentException(sprintf('The helper "%s" is not defined.', $name));
+        }
+
+        return $this->helpers[$name];
+    }
+
+    /**
+     * Sets the command associated with this helper set.
+     *
+     * @param Command $command A Command instance
+     */
+    public function setCommand(Command $command = null)
+    {
+        $this->command = $command;
+    }
+
+    /**
+     * Gets the command associated with this helper set.
+     *
+     * @return Command A Command instance
+     */
+    public function getCommand()
+    {
+        return $this->command;
+    }
+}