<?php
/*
Plugin Name: Cyr to Lat enhanced
Plugin URI: http://wordpress.org/plugins/cyr3lat/
Description: Converts Cyrillic, European and Georgian characters in post, term slugs and media file names to Latin characters. Useful for creating human-readable URLs. Based on the original plugin by Anton Skorobogatov.
Author: Sol, Sergey Biryukov, Nikolay Karev, Dmitri Gogelia
Author URI: http://karevn.com/
Version: 3.5
*/ 

function ctl_sanitize_title($title) {
	global $wpdb;

	$iso9_table = array(
		'А' => 'A',
		'Б' => 'B',
		'В' => 'V',
		'Г' => 'G',
		 'Д' => 'D',
		 'Е' => 'E',
		 'Ё' => 'E', 
		'Ж' => 'ZH',
		'З' => 'Z',
		'И' => 'I',
		'Й' => 'J',
		'Ј' => 'J',
		'І' => 'I',
		'К' => 'K',
		'Л' => 'L', 
		'М' => 'M',
		'Н' => 'N',
		'О' => 'O',
		'П' => 'P',
		'Р' => 'R',
		'С' => 'S',
		'Т' => 'T',
		'У' => 'U',
		'Ў' => 'U',
		'Ф' => 'F',
		'Х' => 'KH',
		'Ц' => 'C',
		'Ч' => 'CH',
		'Џ' => 'DH',
		'Ш' => 'SH',
		'Щ' => 'SHH',
		'Ъ' => '',
		'Ы' => 'Y',
		'Ь' => '',
		'Э' => 'E',
		'Ю' => 'YU',
		'Я' => 'YA',
		'а' => 'a',
		'б' => 'b',
		'в' => 'v',
		'г' => 'g',

		'д' => 'd',
		'е' => 'e',
		'ё' => 'e',
		'ж' => 'zh',
		'з' => 'z',
		'и' => 'i',
		'й' => 'j',
		'ј' => 'j',
		'і' => 'i',
		'к' => 'k',
		'л' => 'l',
		'м' => 'm',
		'н' => 'n',
		'о' => 'o',
		'п' => 'p',
		'р' => 'r',
		'с' => 's',
		'т' => 't',
		'у' => 'u',
		'ф' => 'f',
		'х' => 'kh',
		'ц' => 'c',
		'ч' => 'ch',
		'ш' => 'sh',
		'щ' => 'shh',
		'ъ' => '',
		'ы' => 'y',
		'ь' => '',
		'э' => 'e',
		'ю' => 'yu',
		'я' => 'ya'
	);
	/*$geo2lat = array(
		'ა' => 'a', 'ბ' => 'b', 'გ' => 'g', 'დ' => 'd', 'ე' => 'e', 'ვ' => 'v',
		'ზ' => 'z', 'თ' => 'th', 'ი' => 'i', 'კ' => 'k', 'ლ' => 'l', 'მ' => 'm',
		'ნ' => 'n', 'ო' => 'o', 'პ' => 'p','ჟ' => 'zh','რ' => 'r','ს' => 's',
		'ტ' => 't','უ' => 'u','ფ' => 'ph','ქ' => 'q','ღ' => 'gh','ყ' => 'qh',
		'შ' => 'sh','ჩ' => 'ch','ც' => 'ts','ძ' => 'dz','წ' => 'ts','ჭ' => 'tch',
		'ხ' => 'kh','ჯ' => 'j','ჰ' => 'h'
	);
	$iso9_table = array_merge($iso9_table, $geo2lat);*/

	$locale = get_locale();
	/*
	switch ( $locale ) {
		case 'bg_BG':
			$iso9_table['Щ'] = 'SHT';
			$iso9_table['щ'] = 'sht'; 
			$iso9_table['Ъ'] = 'A';
			$iso9_table['ъ'] = 'a';
			break;
		case 'uk':
		case 'uk_ua':
		case 'uk_UA':
			$iso9_table['И'] = 'Y';
			$iso9_table['и'] = 'y';
			break;
	}
*/
	$is_term = false;
	$backtrace = debug_backtrace();
	foreach ( $backtrace as $backtrace_entry ) {
		if ( $backtrace_entry['function'] == 'wp_insert_term' ) {
			$is_term = true;
			break;
		}
	}

	$term = $is_term ? $wpdb->get_var("SELECT slug FROM {$wpdb->terms} WHERE name = '$title'") : '';
	if ( empty($term) ) {
		$title = strtr($title, apply_filters('ctl_table', $iso9_table));
		if (function_exists('iconv')){
			$title = iconv('UTF-8', 'UTF-8//TRANSLIT//IGNORE', $title);
		}
		$title = preg_replace("/[^A-Za-z0-9'_\-\.]/", '-', $title);
		$title = preg_replace('/\-+/', '-', $title);
		$title = preg_replace('/^-+/', '', $title);
		$title = preg_replace('/-+$/', '', $title);
	} else {
		$title = $term;
	}

	return $title;
}
add_filter('sanitize_title', 'ctl_sanitize_title', 9);
add_filter('sanitize_file_name', 'ctl_sanitize_title');

function ctl_convert_existing_slugs() {
	global $wpdb;

	$posts = $wpdb->get_results("SELECT ID, post_name FROM {$wpdb->posts} WHERE post_name REGEXP('[^A-Za-z0-9\-]+') AND post_status IN ('publish', 'future', 'private')");
	foreach ( (array) $posts as $post ) {
		$sanitized_name = ctl_sanitize_title(urldecode($post->post_name));
		if ( $post->post_name != $sanitized_name ) {
			add_post_meta($post->ID, '_wp_old_slug', $post->post_name);
			$wpdb->update($wpdb->posts, array( 'post_name' => $sanitized_name ), array( 'ID' => $post->ID ));
		}
	}

	$terms = $wpdb->get_results("SELECT term_id, slug FROM {$wpdb->terms} WHERE slug REGEXP('[^A-Za-z0-9\-]+') ");
	foreach ( (array) $terms as $term ) {
		$sanitized_slug = ctl_sanitize_title(urldecode($term->slug));
		if ( $term->slug != $sanitized_slug ) {
			$wpdb->update($wpdb->terms, array( 'slug' => $sanitized_slug ), array( 'term_id' => $term->term_id ));
		}
	}
}

function ctl_schedule_conversion() {
	add_action('shutdown', 'ctl_convert_existing_slugs');
}
register_activation_hook(__FILE__, 'ctl_schedule_conversion');