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diff --git a/vendor/drush/drush/src/Psysh/DrushCommand.php b/vendor/drush/drush/src/Psysh/DrushCommand.php
new file mode 100644
index 000000000..4172f5d9c
--- /dev/null
+++ b/vendor/drush/drush/src/Psysh/DrushCommand.php
@@ -0,0 +1,134 @@
+<?php
+/**
+ * @file
+ * Contains \Drush\Psysh\DrushCommand.
+ *
+ * DrushCommand is a PsySH proxy command which accepts a Drush command config
+ * array and tries to build an appropriate PsySH command for it.
+ */
+
+namespace Drush\Psysh;
+
+use Consolidation\AnnotatedCommand\AnnotatedCommand;
+use Psy\Command\Command as BaseCommand;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Main Drush command.
+ */
+class DrushCommand extends BaseCommand
+{
+
+    /**
+     * @var \Consolidation\AnnotatedCommand\AnnotatedCommand
+     */
+    private $command;
+
+    /**
+     * DrushCommand constructor.
+     *
+     * @param \Consolidation\AnnotatedCommand\AnnotatedCommand $command
+     *   Original (annotated) Drush command.
+     */
+    public function __construct(AnnotatedCommand $command)
+    {
+        $this->command = $command;
+        parent::__construct();
+    }
+
+    /**
+     * Get the namespace of this command.
+     */
+    public function getNamespace()
+    {
+        $parts = explode('-', $this->getName());
+        return count($parts) >= 2 ? array_shift($parts) : 'global';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+        ->setName($this->command->getName())
+        ->setAliases($this->command->getAliases())
+        ->setDefinition($this->command->getDefinition())
+        ->setDescription($this->command->getDescription())
+        ->setHelp($this->buildHelpFromCommand());
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $args = $input->getArguments();
+        $first = array_shift($args);
+
+        // If the first argument is an alias, assign the next argument as the
+        // command.
+        if (strpos($first, '@') === 0) {
+            $alias = $first;
+            $command = array_shift($args);
+        } // Otherwise, default the alias to '@self' and use the first argument as the
+        // command.
+        else {
+            $alias = '@self';
+            $command = $first;
+        }
+
+        $options = $input->getOptions();
+        // Force the 'backend' option to TRUE.
+        $options['backend'] = true;
+
+        $return = drush_invoke_process($alias, $command, array_values($args), $options, ['interactive' => true]);
+
+        if ($return['error_status'] > 0) {
+            foreach ($return['error_log'] as $error_type => $errors) {
+                $output->write($errors);
+            }
+            // Add a newline after so the shell returns on a new line.
+            $output->writeln('');
+        } else {
+            $output->page(drush_backend_get_result());
+        }
+    }
+
+    /**
+     * Build a command help from the Drush configuration array.
+     *
+     * Currently it's a word-wrapped description, plus any examples provided.
+     *
+     * @return string
+     *   The help string.
+     */
+    protected function buildHelpFromCommand()
+    {
+        $help = wordwrap($this->command->getDescription());
+
+        $examples = [];
+        foreach ($this->command->getExampleUsages() as $ex => $def) {
+            // Skip empty examples and things with obvious pipes...
+            if (($ex === '') || (strpos($ex, '|') !== false)) {
+                continue;
+            }
+
+            $ex = preg_replace('/^drush\s+/', '', $ex);
+            $examples[$ex] = $def;
+        }
+
+        if (!empty($examples)) {
+            $help .= "\n\ne.g.";
+
+            foreach ($examples as $ex => $def) {
+                $help .= sprintf("\n<return>// %s</return>\n", wordwrap(OutputFormatter::escape($def), 75, "</return>\n<return>// "));
+                $help .= sprintf("<return>>>> %s</return>\n", OutputFormatter::escape($ex));
+            }
+        }
+
+        return $help;
+    }
+}