--- /dev/null
+<?php
+
+/*
+ * This file is part of the Behat.
+ * (c) Konstantin Kudryashov <ever.zet@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Behat\Behat\Context\Cli;
+
+use Behat\Behat\Context\Environment\ContextEnvironment;
+use Behat\Behat\Context\Snippet\Generator\TargetContextIdentifier;
+use Symfony\Component\Console\Helper\QuestionHelper;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Question\ChoiceQuestion;
+use Symfony\Component\Translation\TranslatorInterface;
+
+/**
+ * Interactive identifier that asks user for input.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+final class InteractiveContextIdentifier implements TargetContextIdentifier
+{
+ /**
+ * @var TranslatorInterface
+ */
+ private $translator;
+ /**
+ * @var InputInterface
+ */
+ private $input;
+ /**
+ * @var OutputInterface
+ */
+ private $output;
+
+ /**
+ * Initialises identifier.
+ *
+ * @param TranslatorInterface $translator
+ * @param InputInterface $input
+ * @param OutputInterface $output
+ */
+ public function __construct(TranslatorInterface $translator, InputInterface $input, OutputInterface $output)
+ {
+ $this->translator = $translator;
+ $this->input = $input;
+ $this->output = $output;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function guessTargetContextClass(ContextEnvironment $environment)
+ {
+ if ($this->interactionIsNotSupported()) {
+ return null;
+ }
+
+ $suiteName = $environment->getSuite()->getName();
+ $contextClasses = $environment->getContextClasses();
+
+ if (!count($contextClasses)) {
+ return null;
+ }
+
+ $message = $this->translator->trans('snippet_context_choice', array('%1%' => $suiteName), 'output');
+ $choices = array_values(array_merge(array('None'), $contextClasses));
+ $default = current($contextClasses);
+
+ $answer = $this->askQuestion('>> ' . $message, $choices, $default);
+
+ return 'None' !== $answer ? $answer : null;
+ }
+
+ /**
+ * Asks user question.
+ *
+ * @param string $message
+ * @param string[] $choices
+ * @param string $default
+ *
+ * @return string
+ */
+ private function askQuestion($message, $choices, $default)
+ {
+ $this->output->writeln('');
+ $helper = new QuestionHelper();
+ $question = new ChoiceQuestion(' ' . $message . "\n", $choices, $default);
+
+ return $helper->ask($this->input, $this->output, $question);
+ }
+
+ /**
+ * Checks if interactive mode is supported.
+ *
+ * @return Boolean
+ *
+ * @deprecated there is a better way to do it - `InputInterface::isInteractive()` method.
+ * Sadly, this doesn't work properly prior Symfony\Console 2.7 and as we need
+ * to support 2.5+ until the next major, we are forced to do a more explicit
+ * check for the CLI option. This should be reverted back to proper a
+ * `InputInterface::isInteractive()` call as soon as we bump dependencies
+ * to Symfony\Console 3.x in Behat 4.x.
+ */
+ private function interactionIsNotSupported()
+ {
+ return $this->input->hasParameterOption('--no-interaction');
+ }
+}