--- /dev/null
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Readline;
+
+use Psy\Util\Str;
+
+/**
+ * A Libedit-based Readline implementation.
+ *
+ * This is largely the same as the Readline implementation, but it emulates
+ * support for `readline_list_history` since PHP decided it was a good idea to
+ * ship a fake Readline implementation that is missing history support.
+ */
+class Libedit extends GNUReadline
+{
+ /**
+ * Let's emulate GNU Readline by manually reading and parsing the history file!
+ *
+ * @return bool
+ */
+ public static function isSupported()
+ {
+ return function_exists('readline') && !function_exists('readline_list_history');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function listHistory()
+ {
+ $history = file_get_contents($this->historyFile);
+ if (!$history) {
+ return array();
+ }
+
+ // libedit doesn't seem to support non-unix line separators.
+ $history = explode("\n", $history);
+
+ // shift the history signature, ensure it's valid
+ if (array_shift($history) !== '_HiStOrY_V2_') {
+ return array();
+ }
+
+ // decode the line
+ $history = array_map(array($this, 'parseHistoryLine'), $history);
+ // filter empty lines & comments
+ return array_values(array_filter($history));
+ }
+
+ /**
+ * From GNUReadline (readline/histfile.c & readline/histexpand.c):
+ * lines starting with "\0" are comments or timestamps;
+ * if "\0" is found in an entry,
+ * everything from it until the next line is a comment.
+ *
+ * @param string $line The history line to parse
+ *
+ * @return string | null
+ */
+ protected function parseHistoryLine($line)
+ {
+ // empty line, comment or timestamp
+ if (!$line || $line[0] === "\0") {
+ return;
+ }
+ // if "\0" is found in an entry, then
+ // everything from it until the end of line is a comment.
+ if (($pos = strpos($line, "\0")) !== false) {
+ $line = substr($line, 0, $pos);
+ }
+
+ return ($line !== '') ? Str::unvis($line) : null;
+ }
+}