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<?php
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/*
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* This file is part of Psy Shell.
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*
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* (c) 2012-2022 Justin Hileman
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Psy\Readline;
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use Psy\Util\Str;
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/**
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* A Libedit-based Readline implementation.
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*
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* This is largely the same as the Readline implementation, but it emulates
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* support for `readline_list_history` since PHP decided it was a good idea to
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* ship a fake Readline implementation that is missing history support.
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*
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* NOTE: As of PHP 7.4, PHP sometimes has history support in the Libedit
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* wrapper, so it will use the GNUReadline implementation rather than this one.
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*/
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class Libedit extends GNUReadline
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{
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private $hasWarnedOwnership = false;
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/**
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* Let's emulate GNU Readline by manually reading and parsing the history file!
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*
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* @return bool
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*/
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public static function isSupported(): bool
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{
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return \function_exists('readline') && !\function_exists('readline_list_history');
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}
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/**
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* {@inheritdoc}
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*/
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public static function supportsBracketedPaste(): bool
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{
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return false;
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}
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/**
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* {@inheritdoc}
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*/
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public function listHistory(): array
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{
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$history = \file_get_contents($this->historyFile);
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if (!$history) {
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return [];
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}
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// libedit doesn't seem to support non-unix line separators.
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$history = \explode("\n", $history);
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// remove history signature if it exists
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if ($history[0] === '_HiStOrY_V2_') {
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\array_shift($history);
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}
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// decode the line
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$history = \array_map([$this, 'parseHistoryLine'], $history);
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// filter empty lines & comments
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return \array_values(\array_filter($history));
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}
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/**
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* {@inheritdoc}
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*/
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public function writeHistory(): bool
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{
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$res = parent::writeHistory();
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// Libedit apparently refuses to save history if the history file is not
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// owned by the user, even if it is writable. Warn when this happens.
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//
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// See https://github.com/bobthecow/psysh/issues/552
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if ($res === false && !$this->hasWarnedOwnership) {
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if (\is_file($this->historyFile) && \is_writable($this->historyFile)) {
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$this->hasWarnedOwnership = true;
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$msg = \sprintf('Error writing history file, check file ownership: %s', $this->historyFile);
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\trigger_error($msg, \E_USER_NOTICE);
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}
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}
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return $res;
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}
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/**
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* From GNUReadline (readline/histfile.c & readline/histexpand.c):
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* lines starting with "\0" are comments or timestamps;
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* if "\0" is found in an entry,
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* everything from it until the next line is a comment.
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*
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* @param string $line The history line to parse
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*
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* @return string|null
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*/
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protected function parseHistoryLine(string $line)
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{
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// empty line, comment or timestamp
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if (!$line || $line[0] === "\0") {
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return;
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}
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// if "\0" is found in an entry, then
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// everything from it until the end of line is a comment.
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if (($pos = \strpos($line, "\0")) !== false) {
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$line = \substr($line, 0, $pos);
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}
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return ($line !== '') ? Str::unvis($line) : null;
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}
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}
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