source: trunk/www.guidonia.net/wp/wp-admin/import/btt.php@ 44

<?php
/**
 * BunnyTags Plugin Tag Importer
 *
 * @package WordPress
 * @subpackage Importer
 */

/**
 * BunnyTags Plugin tag converter
 *
 * This will process the BunnyTags plugin tags and convert them to the WordPress
 * 2.3 taxonomy.
 *
 * @since unknown
 */
class BunnyTags_Import {

        function header() {
                echo '<div class="wrap">';
                screen_icon();
                echo '<h2>'.__('Import Bunny&#8217;s Technorati Tags').'</h2>';
                echo '<p>'.__('Steps may take a few minutes depending on the size of your database. Please be patient.').'<br /><br /></p>';
        }

        function footer() {
                echo '</div>';
        }

        function greet() {
                echo '<div class="narrow">';
                echo '<p>'.__('Howdy! This imports tags from Bunny&#8217;s Technorati Tags into WordPress tags.').'</p>';
                echo '<p>'.__('This is suitable for Bunny&#8217;s Technorati Tags version 0.6.').'</p>';
                echo '<p><strong>'.__('All existing Bunny&#8217;s Technorati Tags will be removed after import.').'</strong></p>';
                echo '<p><strong>'.__('Don&#8217;t be stupid - backup your database before proceeding!').'</strong></p>';
                echo '<form action="admin.php?import=btt&amp;step=1" method="post">';
                wp_nonce_field('import-btt');
                echo '<p class="submit"><input type="submit" name="submit" class="button" value="'.esc_attr__('Import Tags').'" /></p>';
                echo '</form>';
                echo '</div>';
        }

        function dispatch() {
                if ( empty($_GET['step']) )
                        $step = 0;
                else
                        $step = absint($_GET['step']);

                // load the header
                $this->header();

                switch ( $step ) {
                        case 0 :
                                $this->greet();
                                break;
                        case 1 :
                                check_admin_referer('import-btt');
                                $this->check_post_keyword( true );
                                break;
                        case 2 :
                                check_admin_referer('import-btt');
                                $this->check_post_keyword( false );
                                break;
                        case 3:
                                $this->done();
                                break;
                }

                // load the footer
                $this->footer();
        }

        function check_post_keyword($precheck = true) {
                global $wpdb;

                echo '<div class="narrow">';
                echo '<p><h3>'.__('Reading Bunny&#8217;s Technorati Tags&#8230;').'</h3></p>';

                // import Bunny's Keywords tags
                $metakeys = $wpdb->get_results("SELECT post_id, meta_id, meta_key, meta_value FROM $wpdb->postmeta WHERE $wpdb->postmeta.meta_key = 'tags'");
                if ( !is_array($metakeys)) {
                        echo '<p>' . __('No Tags Found!') . '</p>';
                        return false;
                } else {
                        $count = count($metakeys);
                        echo '<p>' . sprintf( _n('Done! <strong>%s</strong> post with tags were read.', 'Done! <strong>%s</strong> posts with tags were read.', $count), $count ) . '<br /></p>';
                        echo '<ul>';
                        foreach ( $metakeys as $post_meta ) {
                                if ( $post_meta->meta_value != '' ) {
                                        $post_keys = explode(' ', $post_meta->meta_value);
                                        foreach ( $post_keys as $keyword ) {
                                                $keyword = addslashes(trim(str_replace('+',' ',$keyword)));
                                                if ( '' != $keyword ) {
                                                        echo '<li>' . $post_meta->post_id . '&nbsp;-&nbsp;' . $keyword . '</li>';
                                                        if ( !$precheck )
                                                                wp_add_post_tags($post_meta->post_id, $keyword);
                                                }
                                        }
                                }
                                if ( !$precheck )
                                        delete_post_meta($post_meta->post_id, 'tags');
                        }
                        echo '</ul>';
                }

                echo '<form action="admin.php?import=btt&amp;step='.($precheck? 2:3).'" method="post">';
                wp_nonce_field('import-btt');
                echo '<p class="submit"><input type="submit" name="submit" class="button" value="'.esc_attr__('Next').'" /></p>';
                echo '</form>';
                echo '</div>';
        }

        function done() {
                echo '<div class="narrow">';
                echo '<p><h3>'.__('Import Complete!').'</h3></p>';
                echo '</div>';
        }

        function BunnyTags_Import() {
        }

}

// create the import object
$btt_import = new BunnyTags_Import();

// add it to the import page!
register_importer('btt', 'Bunny&#8217;s Technorati Tags', __('Import Bunny&#8217;s Technorati Tags into WordPress tags.'), array($btt_import, 'dispatch'));

?>