Chris@13: <?php
Chris@13: 
Chris@13: /*
Chris@13:  * This file is part of Psy Shell.
Chris@13:  *
Chris@13:  * (c) 2012-2018 Justin Hileman
Chris@13:  *
Chris@13:  * For the full copyright and license information, please view the LICENSE
Chris@13:  * file that was distributed with this source code.
Chris@13:  */
Chris@13: 
Chris@13: namespace Psy\Readline;
Chris@13: 
Chris@13: use Psy\Exception\BreakException;
Chris@13: 
Chris@13: /**
Chris@13:  * An array-based Readline emulation implementation.
Chris@13:  */
Chris@13: class Transient implements Readline
Chris@13: {
Chris@13:     private $history;
Chris@13:     private $historySize;
Chris@13:     private $eraseDups;
Chris@13:     private $stdin;
Chris@13: 
Chris@13:     /**
Chris@13:      * Transient Readline is always supported.
Chris@13:      *
Chris@13:      * {@inheritdoc}
Chris@13:      */
Chris@13:     public static function isSupported()
Chris@13:     {
Chris@13:         return true;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * Transient Readline constructor.
Chris@13:      */
Chris@13:     public function __construct($historyFile = null, $historySize = 0, $eraseDups = false)
Chris@13:     {
Chris@13:         // don't do anything with the history file...
Chris@13:         $this->history     = [];
Chris@13:         $this->historySize = $historySize;
Chris@13:         $this->eraseDups   = $eraseDups;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * {@inheritdoc}
Chris@13:      */
Chris@13:     public function addHistory($line)
Chris@13:     {
Chris@13:         if ($this->eraseDups) {
Chris@17:             if (($key = \array_search($line, $this->history)) !== false) {
Chris@13:                 unset($this->history[$key]);
Chris@13:             }
Chris@13:         }
Chris@13: 
Chris@13:         $this->history[] = $line;
Chris@13: 
Chris@13:         if ($this->historySize > 0) {
Chris@17:             $histsize = \count($this->history);
Chris@13:             if ($histsize > $this->historySize) {
Chris@17:                 $this->history = \array_slice($this->history, $histsize - $this->historySize);
Chris@13:             }
Chris@13:         }
Chris@13: 
Chris@17:         $this->history = \array_values($this->history);
Chris@13: 
Chris@13:         return true;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * {@inheritdoc}
Chris@13:      */
Chris@13:     public function clearHistory()
Chris@13:     {
Chris@13:         $this->history = [];
Chris@13: 
Chris@13:         return true;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * {@inheritdoc}
Chris@13:      */
Chris@13:     public function listHistory()
Chris@13:     {
Chris@13:         return $this->history;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * {@inheritdoc}
Chris@13:      */
Chris@13:     public function readHistory()
Chris@13:     {
Chris@13:         return true;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * {@inheritdoc}
Chris@13:      *
Chris@13:      * @throws BreakException if user hits Ctrl+D
Chris@13:      *
Chris@13:      * @return string
Chris@13:      */
Chris@13:     public function readline($prompt = null)
Chris@13:     {
Chris@13:         echo $prompt;
Chris@13: 
Chris@17:         return \rtrim(\fgets($this->getStdin()), "\n\r");
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * {@inheritdoc}
Chris@13:      */
Chris@13:     public function redisplay()
Chris@13:     {
Chris@13:         // noop
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * {@inheritdoc}
Chris@13:      */
Chris@13:     public function writeHistory()
Chris@13:     {
Chris@13:         return true;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * Get a STDIN file handle.
Chris@13:      *
Chris@13:      * @throws BreakException if user hits Ctrl+D
Chris@13:      *
Chris@13:      * @return resource
Chris@13:      */
Chris@13:     private function getStdin()
Chris@13:     {
Chris@13:         if (!isset($this->stdin)) {
Chris@17:             $this->stdin = \fopen('php://stdin', 'r');
Chris@13:         }
Chris@13: 
Chris@17:         if (\feof($this->stdin)) {
Chris@13:             throw new BreakException('Ctrl+D');
Chris@13:         }
Chris@13: 
Chris@13:         return $this->stdin;
Chris@13:     }
Chris@13: }