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diff --git a/vendor/psy/psysh/src/Psy/Command/ListCommand.php b/vendor/psy/psysh/src/Psy/Command/ListCommand.php
new file mode 100644
index 000000000..e463366b6
--- /dev/null
+++ b/vendor/psy/psysh/src/Psy/Command/ListCommand.php
@@ -0,0 +1,285 @@
+<?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\Command\ListCommand\ClassConstantEnumerator;
+use Psy\Command\ListCommand\ClassEnumerator;
+use Psy\Command\ListCommand\ConstantEnumerator;
+use Psy\Command\ListCommand\FunctionEnumerator;
+use Psy\Command\ListCommand\GlobalVariableEnumerator;
+use Psy\Command\ListCommand\InterfaceEnumerator;
+use Psy\Command\ListCommand\MethodEnumerator;
+use Psy\Command\ListCommand\PropertyEnumerator;
+use Psy\Command\ListCommand\TraitEnumerator;
+use Psy\Command\ListCommand\VariableEnumerator;
+use Psy\Exception\RuntimeException;
+use Psy\VarDumper\Presenter;
+use Psy\VarDumper\PresenterAware;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\Console\Helper\TableHelper;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * List available local variables, object properties, etc.
+ */
+class ListCommand extends ReflectingCommand implements PresenterAware
+{
+    protected $presenter;
+    protected $enumerators;
+
+    /**
+     * PresenterAware interface.
+     *
+     * @param Presenter $manager
+     */
+    public function setPresenter(Presenter $presenter)
+    {
+        $this->presenter = $presenter;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('ls')
+            ->setAliases(array('list', 'dir'))
+            ->setDefinition(array(
+                new InputArgument('target', InputArgument::OPTIONAL, 'A target class or object to list.', null),
+
+                new InputOption('vars',        '',  InputOption::VALUE_NONE,     'Display variables.'),
+                new InputOption('constants',   'c', InputOption::VALUE_NONE,     'Display defined constants.'),
+                new InputOption('functions',   'f', InputOption::VALUE_NONE,     'Display defined functions.'),
+                new InputOption('classes',     'k', InputOption::VALUE_NONE,     'Display declared classes.'),
+                new InputOption('interfaces',  'I', InputOption::VALUE_NONE,     'Display declared interfaces.'),
+                new InputOption('traits',      't', InputOption::VALUE_NONE,     'Display declared traits.'),
+
+                new InputOption('no-inherit',  '',  InputOption::VALUE_NONE,     'Exclude inherited methods, properties and constants.'),
+
+                new InputOption('properties',  'p', InputOption::VALUE_NONE,     'Display class or object properties (public properties by default).'),
+                new InputOption('methods',     'm', InputOption::VALUE_NONE,     'Display class or object methods (public methods by default).'),
+
+                new InputOption('grep',        'G', InputOption::VALUE_REQUIRED, 'Limit to items matching the given pattern (string or regex).'),
+                new InputOption('insensitive', 'i', InputOption::VALUE_NONE,     'Case-insensitive search (requires --grep).'),
+                new InputOption('invert',      'v', InputOption::VALUE_NONE,     'Inverted search (requires --grep).'),
+
+                new InputOption('globals',     'g', InputOption::VALUE_NONE,     'Include global variables.'),
+                new InputOption('internal',    'n', InputOption::VALUE_NONE,     'Limit to internal functions and classes.'),
+                new InputOption('user',        'u', InputOption::VALUE_NONE,     'Limit to user-defined constants, functions and classes.'),
+                new InputOption('category',    'C', InputOption::VALUE_REQUIRED, 'Limit to constants in a specific category (e.g. "date").'),
+
+                new InputOption('all',         'a', InputOption::VALUE_NONE,     'Include private and protected methods and properties.'),
+                new InputOption('long',        'l', InputOption::VALUE_NONE,     'List in long format: includes class names and method signatures.'),
+            ))
+            ->setDescription('List local, instance or class variables, methods and constants.')
+            ->setHelp(
+                <<<'HELP'
+List variables, constants, classes, interfaces, traits, functions, methods,
+and properties.
+
+Called without options, this will return a list of variables currently in scope.
+
+If a target object is provided, list properties, constants and methods of that
+target. If a class, interface or trait name is passed instead, list constants
+and methods on that class.
+
+e.g.
+<return>>>> ls</return>
+<return>>>> ls $foo</return>
+<return>>>> ls -k --grep mongo -i</return>
+<return>>>> ls -al ReflectionClass</return>
+<return>>>> ls --constants --category date</return>
+<return>>>> ls -l --functions --grep /^array_.*/</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $this->validateInput($input);
+        $this->initEnumerators();
+
+        $method = $input->getOption('long') ? 'writeLong' : 'write';
+
+        if ($target = $input->getArgument('target')) {
+            list($target, $reflector) = $this->getTargetAndReflector($target, true);
+        } else {
+            $reflector = null;
+        }
+
+        // TODO: something cleaner than this :-/
+        if ($input->getOption('long')) {
+            $output->startPaging();
+        }
+
+        foreach ($this->enumerators as $enumerator) {
+            $this->$method($output, $enumerator->enumerate($input, $reflector, $target));
+        }
+
+        if ($input->getOption('long')) {
+            $output->stopPaging();
+        }
+
+        // Set some magic local variables
+        if ($reflector !== null) {
+            $this->setCommandScopeVariables($reflector);
+        }
+    }
+
+    /**
+     * Initialize Enumerators.
+     */
+    protected function initEnumerators()
+    {
+        if (!isset($this->enumerators)) {
+            $mgr = $this->presenter;
+
+            $this->enumerators = array(
+                new ClassConstantEnumerator($mgr),
+                new ClassEnumerator($mgr),
+                new ConstantEnumerator($mgr),
+                new FunctionEnumerator($mgr),
+                new GlobalVariableEnumerator($mgr),
+                new InterfaceEnumerator($mgr),
+                new PropertyEnumerator($mgr),
+                new MethodEnumerator($mgr),
+                new TraitEnumerator($mgr),
+                new VariableEnumerator($mgr, $this->context),
+            );
+        }
+    }
+
+    /**
+     * Write the list items to $output.
+     *
+     * @param OutputInterface $output
+     * @param null|array      $result List of enumerated items
+     */
+    protected function write(OutputInterface $output, array $result = null)
+    {
+        if ($result === null) {
+            return;
+        }
+
+        foreach ($result as $label => $items) {
+            $names = array_map(array($this, 'formatItemName'), $items);
+            $output->writeln(sprintf('<strong>%s</strong>: %s', $label, implode(', ', $names)));
+        }
+    }
+
+    /**
+     * Write the list items to $output.
+     *
+     * Items are listed one per line, and include the item signature.
+     *
+     * @param OutputInterface $output
+     * @param null|array      $result List of enumerated items
+     */
+    protected function writeLong(OutputInterface $output, array $result = null)
+    {
+        if ($result === null) {
+            return;
+        }
+
+        $table = $this->getTable($output);
+
+        foreach ($result as $label => $items) {
+            $output->writeln('');
+            $output->writeln(sprintf('<strong>%s:</strong>', $label));
+
+            $table->setRows(array());
+            foreach ($items as $item) {
+                $table->addRow(array($this->formatItemName($item), $item['value']));
+            }
+
+            if ($table instanceof TableHelper) {
+                $table->render($output);
+            } else {
+                $table->render();
+            }
+        }
+    }
+
+    /**
+     * Format an item name given its visibility.
+     *
+     * @param array $item
+     *
+     * @return string
+     */
+    private function formatItemName($item)
+    {
+        return sprintf('<%s>%s</%s>', $item['style'], OutputFormatter::escape($item['name']), $item['style']);
+    }
+
+    /**
+     * Validate that input options make sense, provide defaults when called without options.
+     *
+     * @throws RuntimeException if options are inconsistent
+     *
+     * @param InputInterface $input
+     */
+    private function validateInput(InputInterface $input)
+    {
+        // grep, invert and insensitive
+        if (!$input->getOption('grep')) {
+            foreach (array('invert', 'insensitive') as $option) {
+                if ($input->getOption($option)) {
+                    throw new RuntimeException('--' . $option . ' does not make sense without --grep');
+                }
+            }
+        }
+
+        if (!$input->getArgument('target')) {
+            // if no target is passed, there can be no properties or methods
+            foreach (array('properties', 'methods', 'no-inherit') as $option) {
+                if ($input->getOption($option)) {
+                    throw new RuntimeException('--' . $option . ' does not make sense without a specified target.');
+                }
+            }
+
+            foreach (array('globals', 'vars', 'constants', 'functions', 'classes', 'interfaces', 'traits') as $option) {
+                if ($input->getOption($option)) {
+                    return;
+                }
+            }
+
+            // default to --vars if no other options are passed
+            $input->setOption('vars', true);
+        } else {
+            // if a target is passed, classes, functions, etc don't make sense
+            foreach (array('vars', 'globals', 'functions', 'classes', 'interfaces', 'traits') as $option) {
+                if ($input->getOption($option)) {
+                    throw new RuntimeException('--' . $option . ' does not make sense with a specified target.');
+                }
+            }
+
+            foreach (array('constants', 'properties', 'methods') as $option) {
+                if ($input->getOption($option)) {
+                    return;
+                }
+            }
+
+            // default to --constants --properties --methods if no other options are passed
+            $input->setOption('constants',  true);
+            $input->setOption('properties', true);
+            $input->setOption('methods',    true);
+        }
+    }
+}