<?php

    function me_show_menu_post_type_in_export_options() {

        global $wp_post_types;
        $wp_post_types['nav_menu_item']->_builtin = false;
        $wp_post_types['attachment']->_builtin = false;

    }
    add_action( 'load-export.php', 'me_show_menu_post_type_in_export_options' );

    /**
     * The normal WordPress exporter API does not provide enough hooks etc, so we hijack the export page and run our own.
     *
     */
    function me_catch_menu_export() {

        if( !isset( $_GET['download'] ) || empty( $_GET['content'] ) || $_GET['content'] !== 'nav_menu_item' )  {
            return;
        }

        me_export_wp();

    }
    add_action( 'load-export.php', 'me_catch_menu_export' );

    /**
     * Generates the WXR export file for download - This is a rip of export_wp but supports only exporting menus and it's terms
     *
     *
     * @param array $args Filters defining what should be included in the export
     */
    function me_export_wp( $args = array() ) {
        global $wpdb, $post;

        $sitename = sanitize_key( get_bloginfo( 'name' ) );
        if ( ! empty($sitename) ) $sitename .= '.';
        $filename = $sitename . 'wordpress.' . date( 'Y-m-d' ) . '.xml';

        header( 'Content-Description: File Transfer' );
        header( 'Content-Disposition: attachment; filename=' . $filename );
        header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true );

        $where = $wpdb->prepare( "{$wpdb->posts}.post_type = %s", 'nav_menu_item' );

        // grab a snapshot of post IDs, just in case it changes during the export
        $post_ids = $wpdb->get_col( "SELECT ID FROM {$wpdb->posts} WHERE $where" );

        /**
         * Wrap given string in XML CDATA tag.
         *
         * @since 2.1.0
         *
         * @param string $str String to wrap in XML CDATA tag.
         */
        function wxr_cdata( $str ) {
            if ( seems_utf8( $str ) == false )
                $str = utf8_encode( $str );

            // $str = ent2ncr(esc_html($str));
            $str = "<![CDATA[$str" . ( ( substr( $str, -1 ) == ']' ) ? ' ' : '') . "]]>";

            return $str;
        }

        /**
         * Return the URL of the site
         *
         * @since 2.5.0
         *
         * @return string Site URL.
         */
        function wxr_site_url() {
            // ms: the base url
            if ( is_multisite() )
                return network_home_url();
            // wp: the blog url
            else
                return get_bloginfo_rss( 'url' );
        }

        /**
         * Output a term_name XML tag from a given term object
         *
         * @since 2.9.0
         *
         * @param object $term Term Object
         */
        function wxr_term_name( $term ) {
            if ( empty( $term->name ) )
                return;

            echo '<wp:term_name>' . wxr_cdata( $term->name ) . '</wp:term_name>';
        }

        /**
         * Ouput all navigation menu terms
         *
         * @since 3.1.0
         */
        function wxr_nav_menu_terms() {
            $nav_menus = wp_get_nav_menus();
            if ( empty( $nav_menus ) || ! is_array( $nav_menus ) )
                return;

            foreach ( $nav_menus as $menu ) {
                echo "\t<wp:term><wp:term_id>{$menu->term_id}</wp:term_id><wp:term_taxonomy>nav_menu</wp:term_taxonomy><wp:term_slug>{$menu->slug}</wp:term_slug>";
                wxr_term_name( $menu );
                echo "</wp:term>\n";
            }
        }

        function me_wxr_nav_menu_item_terms_and_posts( &$post_ids ) {

            $posts_to_add = array();

            foreach( $post_ids as $post_id ) {

                if( ($type = get_post_meta( $post_id, '_menu_item_type', true ) ) == 'taxonomy' ) {
                    $term = get_term( get_post_meta( $post_id, '_menu_item_object_id', true ), ($tax = get_post_meta( $post_id, '_menu_item_object', true )) );

                    echo "\t<wp:term><wp:term_id>{$term->term_id}</wp:term_id><wp:term_taxonomy>{$tax}</wp:term_taxonomy><wp:term_slug>{$term->slug}</wp:term_slug>";
                    wxr_term_name( $term );
                    echo "</wp:term>\n";
                } elseif( $type == 'post_type' && in_array( get_post_meta( $post_id, '_menu_item_object', true ), array( 'post','page','st_hotel','st_activity','st_rental','st_tours','st_cars','hotel_room','rental_room') ) ) {

                    $posts_to_add[] = get_post_meta( $post_id, '_menu_item_object_id', true );
                }


            }
            $post_ids = array_merge( $posts_to_add, $post_ids );
        }

        /**
         * Output list of taxonomy terms, in XML tag format, associated with a post
         *
         * @since 2.3.0
         */
        function wxr_post_taxonomy() {
            error_reporting(0);
            global $post;
            $taxonomies = get_object_taxonomies( $post->post_type );
            if ( empty( $taxonomies ) )
                return;
            $terms = wp_get_object_terms( $post->ID, $taxonomies );

            foreach ( (array) $terms as $term ) {
                echo "\t\t<category domain=\"{$term->taxonomy}\" nicename=\"{$term->slug}\">" . wxr_cdata( $term->name ) . "</category>\n";
            }
        }

        echo '<?xml version="1.0" encoding="' . get_bloginfo('charset') . "\" ?>\n";

        ?>
        <!-- This is a WordPress eXtended RSS file generated by WordPress as an export of your site. -->
        <!-- It contains information about your site's posts, pages, comments, categories, and other content. -->
        <!-- You may use this file to transfer that content from one site to another. -->
        <!-- This file is not intended to serve as a complete backup of your site. -->

        <!-- To import this information into a WordPress site follow these steps: -->
        <!-- 1. Log in to that site as an administrator. -->
        <!-- 2. Go to Tools: Import in the WordPress admin panel. -->
        <!-- 3. Install the "WordPress" importer from the list. -->
        <!-- 4. Activate & Run Importer. -->
        <!-- 5. Upload this file using the form provided on that page. -->
        <!-- 6. You will first be asked to map the authors in this export file to users -->
        <!--    on the site. For each author, you may choose to map to an -->
        <!--    existing user on the site or to create a new user. -->
        <!-- 7. WordPress will then import each of the posts, pages, comments, categories, etc. -->
        <!--    contained in this file into your site. -->

        <?php the_generator( 'export' ); ?>
        <rss version="2.0"
             xmlns:excerpt="http://wordpress.org/export/<?php echo '1.1'; ?>/excerpt/"
             xmlns:content="http://purl.org/rss/1.0/modules/content/"
             xmlns:wfw="http://wellformedweb.org/CommentAPI/"
             xmlns:dc="http://purl.org/dc/elements/1.1/"
             xmlns:wp="http://wordpress.org/export/<?php echo '1.1'; ?>/"
            >

            <channel>
                <title><?php bloginfo_rss( 'name' ); ?></title>
                <link><?php bloginfo_rss( 'url' ); ?></link>
                <description><?php bloginfo_rss( 'description' ); ?></description>
                <pubDate><?php echo date( 'D, d M Y H:i:s +0000' ); ?></pubDate>
                <language><?php echo get_option( 'rss_language' ); ?></language>
                <wp:wxr_version><?php echo '1.1'; ?></wp:wxr_version>
                <wp:base_site_url><?php echo wxr_site_url(); ?></wp:base_site_url>
                <wp:base_blog_url><?php bloginfo_rss( 'url' ); ?></wp:base_blog_url>

                <?php wxr_nav_menu_terms(); ?>
                <?php me_wxr_nav_menu_item_terms_and_posts( $post_ids ) ?>

                <?php do_action( 'rss2_head' ); ?>

                <?php if ( $post_ids ) {
                    global $wp_query;
                    $wp_query->in_the_loop = true; // Fake being in the loop.

                    // fetch 20 posts at a time rather than loading the entire table into memory
                    while ( $next_posts = array_splice( $post_ids, 0, 20 ) ) {
                        $where = "WHERE ID IN (" . join( ',', $next_posts ) . ")";
                        $posts = $wpdb->get_results( "SELECT * FROM {$wpdb->posts} $where" );

                        // Begin Loop
                        foreach ( $posts as $post ) {
                            setup_postdata( $post );
                            $is_sticky = is_sticky( $post->ID ) ? 1 : 0;
                            ?>
                            <item>
                                <title><?php echo apply_filters( 'the_title_rss', $post->post_title ); ?></title>
                                <link><?php the_permalink_rss() ?></link>
                                <pubDate><?php echo mysql2date( 'D, d M Y H:i:s +0000', get_post_time( 'Y-m-d H:i:s', true ), false ); ?></pubDate>
                                <dc:creator><?php echo get_the_author_meta( 'login' ); ?></dc:creator>
                                <guid isPermaLink="false"><?php esc_url( the_guid() ); ?></guid>
                                <description></description>
                                <content:encoded><?php echo wxr_cdata( apply_filters( 'the_content_export', $post->post_content ) ); ?></content:encoded>
                                <excerpt:encoded><?php echo wxr_cdata( apply_filters( 'the_excerpt_export', $post->post_excerpt ) ); ?></excerpt:encoded>
                                <wp:post_id><?php echo $post->ID; ?></wp:post_id>
                                <wp:post_date><?php echo $post->post_date; ?></wp:post_date>
                                <wp:post_date_gmt><?php echo $post->post_date_gmt; ?></wp:post_date_gmt>
                                <wp:comment_status><?php echo $post->comment_status; ?></wp:comment_status>
                                <wp:ping_status><?php echo $post->ping_status; ?></wp:ping_status>
                                <wp:post_name><?php echo $post->post_name; ?></wp:post_name>
                                <wp:status><?php echo $post->post_status; ?></wp:status>
                                <wp:post_parent><?php echo $post->post_parent; ?></wp:post_parent>
                                <wp:menu_order><?php echo $post->menu_order; ?></wp:menu_order>
                                <wp:post_type><?php echo $post->post_type; ?></wp:post_type>
                                <wp:post_password><?php echo $post->post_password; ?></wp:post_password>
                                <wp:is_sticky><?php echo $is_sticky; ?></wp:is_sticky>
                                <?php	if ( $post->post_type == 'attachment' ) : ?>
                                    <wp:attachment_url><?php echo wp_get_attachment_url( $post->ID ); ?></wp:attachment_url>
                                <?php 	endif; ?>
                                <?php 	wxr_post_taxonomy(); ?>
                                <?php	$postmeta = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->postmeta WHERE post_id = %d", $post->ID ) );
                                    if ( $postmeta ) : foreach( $postmeta as $meta ) : if ( $meta->meta_key != '_edit_lock' ) : ?>
                                        <wp:postmeta>
                                            <wp:meta_key><?php echo $meta->meta_key; ?></wp:meta_key>
                                            <wp:meta_value><?php echo wxr_cdata( $meta->meta_value ); ?></wp:meta_value>
                                        </wp:postmeta>
                                    <?php	endif; endforeach; endif; ?>
                                <?php	$comments = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved <> 'spam'", $post->ID ) );
                                    if ( $comments ) : foreach ( $comments as $c ) : ?>
                                        <wp:comment>
                                            <wp:comment_id><?php echo $c->comment_ID; ?></wp:comment_id>
                                            <wp:comment_author><?php echo wxr_cdata( $c->comment_author ); ?></wp:comment_author>
                                            <wp:comment_author_email><?php echo $c->comment_author_email; ?></wp:comment_author_email>
                                            <wp:comment_author_url><?php echo esc_url_raw( $c->comment_author_url ); ?></wp:comment_author_url>
                                            <wp:comment_author_IP><?php echo $c->comment_author_IP; ?></wp:comment_author_IP>
                                            <wp:comment_date><?php echo $c->comment_date; ?></wp:comment_date>
                                            <wp:comment_date_gmt><?php echo $c->comment_date_gmt; ?></wp:comment_date_gmt>
                                            <wp:comment_content><?php echo wxr_cdata( $c->comment_content ) ?></wp:comment_content>
                                            <wp:comment_approved><?php echo $c->comment_approved; ?></wp:comment_approved>
                                            <wp:comment_type><?php echo $c->comment_type; ?></wp:comment_type>
                                            <wp:comment_parent><?php echo $c->comment_parent; ?></wp:comment_parent>
                                            <wp:comment_user_id><?php echo $c->user_id; ?></wp:comment_user_id>
                                        </wp:comment>
                                    <?php	endforeach; endif; ?>
                            </item>
                        <?php
                        }
                    }
                } ?>
            </channel>
        </rss>
    <?php
    }
