ReleaseCleaner.php

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<?php
namespace Elgg\I18n;

class ReleaseCleaner {

    private $codes;

    public $log = [];

    public function __construct(array $codes = []) {
        if (!$codes) {
            $codes = Translator::getAllLanguageCodes();
        }
        $this->codes = $codes;
    }

    public function cleanInstallation($dir) {
        $dir = rtrim($dir, '/\\');

        if (is_dir("$dir/languages")) {
            $this->cleanLanguagesDir("$dir/languages");
        }

        $dir = "$dir/mod";

        foreach (scandir($dir) as $entry) {
            if ($entry[0] === '.') {
                continue;
            }

            $path = "$dir/$entry";

            if (is_dir("$path/languages")) {
                $this->cleanLanguagesDir("$path/languages");
            }
        }
    }

    public function cleanLanguagesDir($dir) {
        $dir = rtrim($dir, '/\\');

        foreach (scandir($dir) as $entry) {
            if ($entry[0] === '.') {
                continue;
            }

            if (pathinfo($entry, PATHINFO_EXTENSION) !== 'php') {
                continue;
            }

            $path = "$dir/$entry";

            $code = basename($entry, '.php');
            if (!in_array($code, $this->codes)) {
                $code = Translator::normalizeLanguageCode($code);

                if (in_array($code, $this->codes)) {
                    // rename file to lowercase
                    rename($path, "$dir/$code.php");
                    $this->log[] = "Renamed $path to $code.php";
                    continue;
                }

                unlink($path);
                $this->log[] = "Removed $path";
            }
        }
    }
}