<?php

/**

* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

*

* Licensed under The MIT License

* For full copyright and license information, please see the LICENSE.txt

* Redistributions of files must retain the above copyright notice.

*

* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

* @link http://cakephp.org CakePHP(tm) Project

* @since 2.0.0

* @license http://www.opensource.org/licenses/mit-license.php MIT License

*/

namespace Cake\Console;

/**

* Object wrapper for interacting with stdin

*

*/

class ConsoleInput

{

/**

* Input value.

*

* @var resource

*/

protected $_input;

/**

* Can this instance use readline?

* Two conditions must be met:

* 1. Readline support must be enabled.

* 2. Handle we are attached to must be stdin.

* Allows rich editing with arrow keys and history when inputting a string.

*

* @var bool

*/

protected $_canReadline;

/**

* Constructor

*

* @param string $handle The location of the stream to use as input.

*/

public function __construct($handle = 'php://stdin')

{

$this->_canReadline = extension_loaded('readline') && $handle === 'php://stdin' ? true : false;

$this->_input = fopen($handle, 'r');

}

/**

* Read a value from the stream

*

* @return mixed The value of the stream

*/

public function read()

{

if ($this->_canReadline) {

$line = readline('');

if (!empty($line)) {

readline_add_history($line);

}

return $line;

}

return fgets($this->_input);

}

/**

* Check if data is available on stdin

*

* @param int $timeout An optional time to wait for data

* @return bool True for data available, false otherwise

*/

public function dataAvailable($timeout = 0)

{

$readFds = [$this->_input];

$readyFds = stream_select($readFds, $writeFds, $errorFds, $timeout);

return ($readyFds > 0);

}

}