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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2023 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\Readline;
/**
* A Readline interface implementation for GNU Readline.
*
* This is by far the coolest way to do it, if you can.
*
* Oh well.
*/
class GNUReadline implements Readline
{
/** @var string|false */
protected $historyFile;
/** @var int */
protected $historySize;
/** @var bool */
protected $eraseDups;
/**
* GNU Readline is supported iff `readline_list_history` is defined. PHP
* decided it would be awesome to swap out GNU Readline for Libedit, but
* they ended up shipping an incomplete implementation. So we've got this.
*
* NOTE: As of PHP 7.4, PHP sometimes has history support in the Libedit
* wrapper, so that will use the GNUReadline implementation as well!
*/
public static function isSupported(): bool
{
return \function_exists('readline') && \function_exists('readline_list_history');
}
/**
* Check whether this readline implementation supports bracketed paste.
*
* Currently, the GNU readline implementation does, but the libedit wrapper does not.
*/
public static function supportsBracketedPaste(): bool
{
return self::isSupported() && \stripos(\readline_info('library_version') ?: '', 'editline') === false;
}
public function __construct($historyFile = null, $historySize = 0, $eraseDups = false)
{
$this->historyFile = ($historyFile !== null) ? $historyFile : false;
$this->historySize = $historySize;
$this->eraseDups = $eraseDups;
\readline_info('readline_name', 'psysh');
}
/**
* {@inheritdoc}
*/
public function addHistory(string $line): bool
{
if ($res = \readline_add_history($line)) {
$this->writeHistory();
}
return $res;
}
/**
* {@inheritdoc}
*/
public function clearHistory(): bool
{
if ($res = \readline_clear_history()) {
$this->writeHistory();
}
return $res;
}
/**
* {@inheritdoc}
*/
public function listHistory(): array
{
return \readline_list_history();
}
/**
* {@inheritdoc}
*/
public function readHistory(): bool
{
\readline_read_history();
\readline_clear_history();
return \readline_read_history($this->historyFile);
}
/**
* {@inheritdoc}
*/
public function readline(string $prompt = null)
{
return \readline($prompt);
}
/**
* {@inheritdoc}
*/
public function redisplay()
{
\readline_redisplay();
}
/**
* {@inheritdoc}
*/
public function writeHistory(): bool
{
// We have to write history first, since it is used
// by Libedit to list history
if ($this->historyFile !== false) {
$res = \readline_write_history($this->historyFile);
} else {
$res = true;
}
if (!$res || !$this->eraseDups && !$this->historySize > 0) {
return $res;
}
$hist = $this->listHistory();
if (!$hist) {
return true;
}
if ($this->eraseDups) {
// flip-flip technique: removes duplicates, latest entries win.
$hist = \array_flip(\array_flip($hist));
// sort on keys to get the order back
\ksort($hist);
}
if ($this->historySize > 0) {
$histsize = \count($hist);
if ($histsize > $this->historySize) {
$hist = \array_slice($hist, $histsize - $this->historySize);
}
}
\readline_clear_history();
foreach ($hist as $line) {
\readline_add_history($line);
}
if ($this->historyFile !== false) {
return \readline_write_history($this->historyFile);
}
return true;
}
}
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