smuuf/primi

<?php

declare(strict_types=1);

namespace Smuuf\Primi\Drivers;

use \Smuuf\StrictObject;

class ReadlineUserIoDriver extends TerminalIoDriver implements ReplIoDriverInterface {

    use StrictObject;

    /**
     * Keep the latest item added to history for future reference.
     *
     * @var string
     */
    private $lastItem = '';

    public function addToHistory(string $item): void {

        // Avoid storing the same value again, if it's the same value
        // as before. Also don't store empty values to history.
        if (trim($item) === '' || $this->lastItem === $item) {
            return;
        }

        \readline_add_history($item);
        $this->lastItem = $item;

    }

    public function loadHistory(string $path): void {

        // Prior to loading the history file:
        // - Read it,
        // - Remove duplicates,
        // - And save it again.
        $entries = \file($path, \FILE_SKIP_EMPTY_LINES | \FILE_IGNORE_NEW_LINES);
        $fixed = \array_reverse(\array_unique(\array_reverse($entries)));
        \file_put_contents($path, \implode(\PHP_EOL, $fixed));

        \readline_read_history($path);

    }

    public function storeHistory(string $path): void {
        \readline_write_history($path);
    }

}