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diff --git a/vendor/psy/psysh/src/Psy/Command/EditCommand.php b/vendor/psy/psysh/src/Psy/Command/EditCommand.php
new file mode 100644
index 000000000..a1c6ee434
--- /dev/null
+++ b/vendor/psy/psysh/src/Psy/Command/EditCommand.php
@@ -0,0 +1,187 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Command;
+
+use Psy\Context;
+use Psy\ContextAware;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class EditCommand extends Command implements ContextAware
+{
+    /**
+     * @var string
+     */
+    private $runtimeDir = '';
+
+    /**
+     * @var Context
+     */
+    private $context;
+
+    /**
+     * Constructor.
+     *
+     * @param string      $runtimeDir The directory to use for temporary files
+     * @param string|null $name       The name of the command; passing null means it must be set in configure()
+     *
+     * @throws \Symfony\Component\Console\Exception\LogicException When the command name is empty
+     */
+    public function __construct($runtimeDir, $name = null)
+    {
+        parent::__construct($name);
+
+        $this->runtimeDir = $runtimeDir;
+    }
+
+    protected function configure()
+    {
+        $this
+            ->setName('edit')
+            ->setDefinition(array(
+                new InputArgument('file', InputArgument::OPTIONAL, 'The file to open for editing. If this is not given, edits a temporary file.', null),
+                new InputOption(
+                    'exec',
+                    'e',
+                    InputOption::VALUE_NONE,
+                    'Execute the file content after editing. This is the default when a file name argument is not given.',
+                    null
+                ),
+                new InputOption(
+                    'no-exec',
+                    'E',
+                    InputOption::VALUE_NONE,
+                    'Do not execute the file content after editing. This is the default when a file name argument is given.',
+                    null
+                ),
+            ))
+            ->setDescription('Open an external editor. Afterwards, get produced code in input buffer.')
+            ->setHelp('Set the EDITOR environment variable to something you\'d like to use.');
+    }
+
+    /**
+     * @param InputInterface  $input
+     * @param OutputInterface $output
+     *
+     * @throws \InvalidArgumentException when both exec and no-exec flags are given or if a given variable is not found in the current context
+     * @throws \UnexpectedValueException if file_get_contents on the edited file returns false instead of a string
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        if ($input->getOption('exec') &&
+            $input->getOption('no-exec')) {
+            throw new \InvalidArgumentException('The --exec and --no-exec flags are mutually exclusive.');
+        }
+
+        $filePath = $this->extractFilePath($input->getArgument('file'));
+
+        $execute = $this->shouldExecuteFile(
+            $input->getOption('exec'),
+            $input->getOption('no-exec'),
+            $filePath
+        );
+
+        $shouldRemoveFile = false;
+
+        if ($filePath === null) {
+            $filePath = tempnam($this->runtimeDir, 'psysh-edit-command');
+            $shouldRemoveFile = true;
+        }
+
+        $editedContent = $this->editFile($filePath, $shouldRemoveFile);
+
+        if ($execute) {
+            $this->getApplication()->addInput($editedContent);
+        }
+    }
+
+    /**
+     * @param bool        $execOption
+     * @param bool        $noExecOption
+     * @param string|null $filePath
+     *
+     * @return bool
+     */
+    private function shouldExecuteFile($execOption, $noExecOption, $filePath)
+    {
+        if ($execOption) {
+            return true;
+        }
+
+        if ($noExecOption) {
+            return false;
+        }
+
+        // By default, code that is edited is executed if there was no given input file path
+        return $filePath === null;
+    }
+
+    /**
+     * @param string|null $fileArgument
+     *
+     * @return string|null The file path to edit, null if the input was null, or the value of the referenced variable
+     *
+     * @throws \InvalidArgumentException If the variable is not found in the current context
+     */
+    private function extractFilePath($fileArgument)
+    {
+        // If the file argument was a variable, get it from the context
+        if ($fileArgument !== null &&
+            strlen($fileArgument) > 0 &&
+            $fileArgument[0] === '$') {
+            $fileArgument = $this->context->get(preg_replace('/^\$/', '', $fileArgument));
+        }
+
+        return $fileArgument;
+    }
+
+    /**
+     * @param string $filePath
+     * @param string $shouldRemoveFile
+     *
+     * @return string
+     *
+     * @throws \UnexpectedValueException if file_get_contents on $filePath returns false instead of a string
+     */
+    private function editFile($filePath, $shouldRemoveFile)
+    {
+        $escapedFilePath = escapeshellarg($filePath);
+
+        $pipes = array();
+        $proc = proc_open((getenv('EDITOR') ?: 'nano') . " {$escapedFilePath}", array(STDIN, STDOUT, STDERR), $pipes);
+        proc_close($proc);
+
+        $editedContent = @file_get_contents($filePath);
+
+        if ($shouldRemoveFile) {
+            @unlink($filePath);
+        }
+
+        if ($editedContent === false) {
+            throw new \UnexpectedValueException("Reading {$filePath} returned false");
+        }
+
+        return $editedContent;
+    }
+
+    /**
+     * Set the Context reference.
+     *
+     * @param Context $context
+     */
+    public function setContext(Context $context)
+    {
+        $this->context = $context;
+    }
+}