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<?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\Output\OutputInterface;
use Symfony\Component\Console\Formatter\OutputFormatterStyle;
/**
* The Dialog class provides helpers to interact with the user.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class DialogHelper extends InputAwareHelper
{
private $inputStream;
private static $shell;
private static $stty;
/**
* Asks the user to select a value.
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question to ask
* @param array $choices List of choices to pick from
* @param Boolean|string $default The default answer if the user enters nothing
* @param Boolean|integer $attempts Max number of times to ask before giving up (false by default, which means infinite)
* @param string $errorMessage Message which will be shown if invalid value from choice list would be picked
* @param Boolean $multiselect Select more than one value separated by comma
*
* @return integer|string|array The selected value or values (the key of the choices array)
*
* @throws \InvalidArgumentException
*/
public function select(OutputInterface $output, $question, $choices, $default = null, $attempts = false, $errorMessage = 'Value "%s" is invalid', $multiselect = false)
{
$width = max(array_map('strlen', array_keys($choices)));
$messages = (array) $question;
foreach ($choices as $key => $value) {
$messages[] = sprintf(" [<info>%-${width}s</info>] %s", $key, $value);
}
$output->writeln($messages);
$result = $this->askAndValidate($output, '> ', function ($picked) use ($choices, $errorMessage, $multiselect) {
// Collapse all spaces.
$selectedChoices = str_replace(" ", "", $picked);
if ($multiselect) {
// Check for a separated comma values
if (!preg_match('/^[a-zA-Z0-9_-]+(?:,[a-zA-Z0-9_-]+)*$/', $selectedChoices, $matches)) {
throw new \InvalidArgumentException(sprintf($errorMessage, $picked));
}
$selectedChoices = explode(",", $selectedChoices);
} else {
$selectedChoices = array($picked);
}
$multiselectChoices = array();
foreach ($selectedChoices as $value) {
if (empty($choices[$value])) {
throw new \InvalidArgumentException(sprintf($errorMessage, $value));
}
array_push($multiselectChoices, $value);
}
if ($multiselect) {
return $multiselectChoices;
}
return $picked;
}, $attempts, $default);
return $result;
}
/**
* Asks a question to the user.
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question to ask
* @param string $default The default answer if none is given by the user
* @param array $autocomplete List of values to autocomplete
*
* @return string The user answer
*
* @throws \RuntimeException If there is no data to read in the input stream
*/
public function ask(OutputInterface $output, $question, $default = null, array $autocomplete = null)
{
if ($this->input && !$this->input->isInteractive()) {
return $default;
}
$output->write($question);
$inputStream = $this->inputStream ?: STDIN;
if (null === $autocomplete || !$this->hasSttyAvailable()) {
$ret = fgets($inputStream, 4096);
if (false === $ret) {
throw new \RuntimeException('Aborted');
}
$ret = trim($ret);
} else {
$ret = '';
$i = 0;
$ofs = -1;
$matches = $autocomplete;
$numMatches = count($matches);
$sttyMode = shell_exec('stty -g');
// Disable icanon (so we can fread each keypress) and echo (we'll do echoing here instead)
shell_exec('stty -icanon -echo');
// Add highlighted text style
$output->getFormatter()->setStyle('hl', new OutputFormatterStyle('black', 'white'));
// Read a keypress
while (!feof($inputStream)) {
$c = fread($inputStream, 1);
// Backspace Character
if ("\177" === $c) {
if (0 === $numMatches && 0 !== $i) {
$i--;
// Move cursor backwards
$output->write("\033[1D");
}
if ($i === 0) {
$ofs = -1;
$matches = $autocomplete;
$numMatches = count($matches);
} else {
$numMatches = 0;
}
// Pop the last character off the end of our string
$ret = substr($ret, 0, $i);
} elseif ("\033" === $c) { // Did we read an escape sequence?
$c .= fread($inputStream, 2);
// A = Up Arrow. B = Down Arrow
if ('A' === $c[2] || 'B' === $c[2]) {
if ('A' === $c[2] && -1 === $ofs) {
$ofs = 0;
}
if (0 === $numMatches) {
continue;
}
$ofs += ('A' === $c[2]) ? -1 : 1;
$ofs = ($numMatches + $ofs) % $numMatches;
}
} elseif (ord($c) < 32) {
if ("\t" === $c || "\n" === $c) {
if ($numMatches > 0 && -1 !== $ofs) {
$ret = $matches[$ofs];
// Echo out remaining chars for current match
$output->write(substr($ret, $i));
$i = strlen($ret);
}
if ("\n" === $c) {
$output->write($c);
break;
}
$numMatches = 0;
}
continue;
} else {
$output->write($c);
$ret .= $c;
$i++;
$numMatches = 0;
$ofs = 0;
foreach ($autocomplete as $value) {
// If typed characters match the beginning chunk of value (e.g. [AcmeDe]moBundle)
if (0 === strpos($value, $ret) && $i !== strlen($value)) {
$matches[$numMatches++] = $value;
}
}
}
// Erase characters from cursor to end of line
$output->write("\033[K");
if ($numMatches > 0 && -1 !== $ofs) {
// Save cursor position
$output->write("\0337");
// Write highlighted text
$output->write('<hl>'.substr($matches[$ofs], $i).'</hl>');
// Restore cursor position
$output->write("\0338");
}
}
// Reset stty so it behaves normally again
shell_exec(sprintf('stty %s', $sttyMode));
}
return strlen($ret) > 0 ? $ret : $default;
}
/**
* Asks a confirmation to the user.
*
* The question will be asked until the user answers by nothing, yes, or no.
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question to ask
* @param Boolean $default The default answer if the user enters nothing
*
* @return Boolean true if the user has confirmed, false otherwise
*/
public function askConfirmation(OutputInterface $output, $question, $default = true)
{
$answer = 'z';
while ($answer && !in_array(strtolower($answer[0]), array('y', 'n'))) {
$answer = $this->ask($output, $question);
}
if (false === $default) {
return $answer && 'y' == strtolower($answer[0]);
}
return !$answer || 'y' == strtolower($answer[0]);
}
/**
* Asks a question to the user, the response is hidden
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question
* @param Boolean $fallback In case the response can not be hidden, whether to fallback on non-hidden question or not
*
* @return string The answer
*
* @throws \RuntimeException In case the fallback is deactivated and the response can not be hidden
*/
public function askHiddenResponse(OutputInterface $output, $question, $fallback = true)
{
if (defined('PHP_WINDOWS_VERSION_BUILD')) {
$exe = __DIR__.'/../Resources/bin/hiddeninput.exe';
// handle code running from a phar
if ('phar:' === substr(__FILE__, 0, 5)) {
$tmpExe = sys_get_temp_dir().'/hiddeninput.exe';
copy($exe, $tmpExe);
$exe = $tmpExe;
}
$output->write($question);
$value = rtrim(shell_exec($exe));
$output->writeln('');
if (isset($tmpExe)) {
unlink($tmpExe);
}
return $value;
}
if ($this->hasSttyAvailable()) {
$output->write($question);
$sttyMode = shell_exec('stty -g');
shell_exec('stty -echo');
$value = fgets($this->inputStream ?: STDIN, 4096);
shell_exec(sprintf('stty %s', $sttyMode));
if (false === $value) {
throw new \RuntimeException('Aborted');
}
$value = trim($value);
$output->writeln('');
return $value;
}
if (false !== $shell = $this->getShell()) {
$output->write($question);
$readCmd = $shell === 'csh' ? 'set mypassword = $<' : 'read -r mypassword';
$command = sprintf("/usr/bin/env %s -c 'stty -echo; %s; stty echo; echo \$mypassword'", $shell, $readCmd);
$value = rtrim(shell_exec($command));
$output->writeln('');
return $value;
}
if ($fallback) {
return $this->ask($output, $question);
}
throw new \RuntimeException('Unable to hide the response');
}
/**
* Asks for a value and validates the response.
*
* The validator receives the data to validate. It must return the
* validated data when the data is valid and throw an exception
* otherwise.
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question to ask
* @param callable $validator A PHP callback
* @param integer $attempts Max number of times to ask before giving up (false by default, which means infinite)
* @param string $default The default answer if none is given by the user
* @param array $autocomplete List of values to autocomplete
*
* @return mixed
*
* @throws \Exception When any of the validators return an error
*/
public function askAndValidate(OutputInterface $output, $question, $validator, $attempts = false, $default = null, array $autocomplete = null)
{
$that = $this;
$interviewer = function () use ($output, $question, $default, $autocomplete, $that) {
return $that->ask($output, $question, $default, $autocomplete);
};
return $this->validateAttempts($interviewer, $output, $validator, $attempts);
}
/**
* Asks for a value, hide and validates the response.
*
* The validator receives the data to validate. It must return the
* validated data when the data is valid and throw an exception
* otherwise.
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question to ask
* @param callable $validator A PHP callback
* @param integer $attempts Max number of times to ask before giving up (false by default, which means infinite)
* @param Boolean $fallback In case the response can not be hidden, whether to fallback on non-hidden question or not
*
* @return string The response
*
* @throws \Exception When any of the validators return an error
* @throws \RuntimeException In case the fallback is deactivated and the response can not be hidden
*
*/
public function askHiddenResponseAndValidate(OutputInterface $output, $question, $validator, $attempts = false, $fallback = true)
{
$that = $this;
$interviewer = function () use ($output, $question, $fallback, $that) {
return $that->askHiddenResponse($output, $question, $fallback);
};
return $this->validateAttempts($interviewer, $output, $validator, $attempts);
}
/**
* Sets the input stream to read from when interacting with the user.
*
* This is mainly useful for testing purpose.
*
* @param resource $stream The input stream
*/
public function setInputStream($stream)
{
$this->inputStream = $stream;
}
/**
* Returns the helper's input stream
*
* @return string
*/
public function getInputStream()
{
return $this->inputStream;
}
/**
* {@inheritDoc}
*/
public function getName()
{
return 'dialog';
}
/**
* Return a valid Unix shell
*
* @return string|Boolean The valid shell name, false in case no valid shell is found
*/
private function getShell()
{
if (null !== self::$shell) {
return self::$shell;
}
self::$shell = false;
if (file_exists('/usr/bin/env')) {
// handle other OSs with bash/zsh/ksh/csh if available to hide the answer
$test = "/usr/bin/env %s -c 'echo OK' 2> /dev/null";
foreach (array('bash', 'zsh', 'ksh', 'csh') as $sh) {
if ('OK' === rtrim(shell_exec(sprintf($test, $sh)))) {
self::$shell = $sh;
break;
}
}
}
return self::$shell;
}
private function hasSttyAvailable()
{
if (null !== self::$stty) {
return self::$stty;
}
exec('stty 2>&1', $output, $exitcode);
return self::$stty = $exitcode === 0;
}
/**
* Validate an attempt
*
* @param callable $interviewer A callable that will ask for a question and return the result
* @param OutputInterface $output An Output instance
* @param callable $validator A PHP callback
* @param integer $attempts Max number of times to ask before giving up ; false will ask infinitely
*
* @return string The validated response
*
* @throws \Exception In case the max number of attempts has been reached and no valid response has been given
*/
private function validateAttempts($interviewer, OutputInterface $output, $validator, $attempts)
{
$error = null;
while (false === $attempts || $attempts--) {
if (null !== $error) {
$output->writeln($this->getHelperSet()->get('formatter')->formatBlock($error->getMessage(), 'error'));
}
try {
return call_user_func($validator, $interviewer());
} catch (\Exception $error) {
}
}
throw $error;
}
}
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