root/tags/1.3/wp-admin/import/stp.php

<?php
class STP_Import {
    function header()  {
        echo '<div class="wrap">';
        echo '<h2>'.__('Import Simple Tagging').'</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 an existing Simple Tagging 1.6.2 installation into this blog using the new WordPress native tagging structure.').'</p>';
        echo '<p>'.__('This has not been tested on any other versions of Simple Tagging. Mileage may vary.').'</p>';
        echo '<p>'.__('To accommodate larger databases for those tag-crazy authors out there, we have made this into an easy 4-step program to help you kick that nasty Simple Tagging habit. Just keep clicking along and we will let you know when you are in the clear!').'</p>';
        echo '<p><strong>'.__('Don&#8217;t be stupid - backup your database before proceeding!').'</strong></p>';
        echo '<form action="admin.php?import=stp&amp;step=1" method="post">';
        wp_nonce_field('import-stp');
        echo '<p class="submit"><input type="submit" name="submit" value="'.__('Step 1 &raquo;').'" /></p>';
        echo '</form>';
        echo '</div>';
    }

    function dispatch () {
        if ( empty( $_GET['step'] ) ) {
            $step = 0;
        } else {
            $step = (int) $_GET['step'];
        }
        // load the header
        $this->header();
        switch ( $step ) {
            case 0 :
                $this->greet();
                break;
            case 1 :
                check_admin_referer('import-stp');
                $this->import_posts();
                break;
            case 2:
                check_admin_referer('import-stp');
                $this->import_t2p();
                break;
            case 3:
                check_admin_referer('import-stp');
                $this->cleanup_import();
                break;
        }
        // load the footer
        $this->footer();
    }


    function import_posts ( ) {
        echo '<div class="narrow">';
        echo '<p><h3>'.__('Reading STP Post Tags&#8230;').'</h3></p>';

        // read in all the STP tag -> post settings
        $posts = $this->get_stp_posts();

        // if we didn't get any tags back, that's all there is folks!
        if ( !is_array($posts) ) {
            echo '<p>' . __('No posts were found to have tags!') . '</p>';
            return false;
        }
        else {
            // if there's an existing entry, delete it
            if ( get_option('stpimp_posts') ) {
                delete_option('stpimp_posts');
            }
            
            add_option('stpimp_posts', $posts);
            $count = count($posts);
            echo '<p>' . sprintf( __('Done! <strong>%s</strong> tag to post relationships were read.'), $count ) . '<br /></p>';
        }

        echo '<form action="admin.php?import=stp&amp;step=2" method="post">';
        wp_nonce_field('import-stp');
        echo '<p class="submit"><input type="submit" name="submit" value="'.__('Step 2 &raquo;').'" /></p>';
        echo '</form>';
        echo '</div>';
    }


    function import_t2p ( ) {
        echo '<div class="narrow">';
        echo '<p><h3>'.__('Adding Tags to Posts&#8230;').'</h3></p>';
        
        // run that funky magic!
        $tags_added = $this->tag2post();
        
        echo '<p>' . sprintf( __('Done! <strong>%s</strong> tags where added!'), $tags_added ) . '<br /></p>';
        echo '<form action="admin.php?import=stp&amp;step=3" method="post">';
        wp_nonce_field('import-stp');
        echo '<p class="submit"><input type="submit" name="submit" value="'.__('Step 3 &raquo;').'" /></p>';
        echo '</form>';
        echo '</div>';
    }

    function get_stp_posts ( ) {
        global $wpdb;
        // read in all the posts from the STP post->tag table: should be wp_post2tag
        $posts_query = "SELECT post_id, tag_name FROM " . $wpdb->prefix . "stp_tags";
        $posts = $wpdb->get_results($posts_query);
        return $posts;
    }

    function tag2post ( ) {
        global $wpdb;

        // get the tags and posts we imported in the last 2 steps
        $posts = get_option('stpimp_posts');

        // null out our results
        $tags_added = 0;

        // loop through each post and add its tags to the db
        foreach ( $posts as $this_post ) {
            $the_post = (int) $this_post->post_id;
            $the_tag = $wpdb->escape($this_post->tag_name);
            // try to add the tag
            wp_add_post_tags($the_post, $the_tag);
            $tags_added++;
        }

        // that's it, all posts should be linked to their tags properly, pending any errors we just spit out!
        return $tags_added;
    }

    function cleanup_import ( ) {
        delete_option('stpimp_posts');
        $this->done();
    }

    function done ( ) {
        echo '<div class="narrow">';
        echo '<p><h3>'.__('Import Complete!').'</h3></p>';
        echo '<p>' . __('OK, so we lied about this being a 4-step program! You&#8217;re done!') . '</p>';
        echo '<p>' . __('Now wasn&#8217;t that easy?') . '</p>';
        echo '</div>';
    }

    function STP_Import ( ) {
        // Nothing.
    }
}

// create the import object
$stp_import = new STP_Import();

// add it to the import page!
register_importer('stp', 'Simple Tagging', __('Import Simple Tagging tags into the new native tagging structure.'), array($stp_import, 'dispatch'));
?>