Ticket #4107: wp-cat2tag.php

<?php

error_reporting(E_ALL);

class WP_Categories_to_Tags {
        var $categories_to_convert = array();
        var $all_categories = array();
        
        function header() {
                print '<div class="wrap">';
                print '<h2>' . __('Convert Categories to Tags') . '</h2>';
        }
        
        function footer() {
                print '</div>';
        }
        
        function populate_all_categories() {
                $this->all_categories =& get_categories('hide_empty=0&hierarchal=0');
        }
        
        function welcome() {
                print '<div class="narrow">';
                print '<p>' . __('Howdy! This converter allows you to selectively convert existing categories to tags. To get started, check the checkboxes of the categories you wish to be converted, then click the Convert button.') . '</p>';
                print '<p>' . __('Keep in mind that if you convert a category with child categories, those child categories get their parent setting removed, so they\'re in the root.') . '</p>';
                
                $this->categories_form();
                
                print '</div>';
        }
        
        function categories_form() {
                $this->populate_all_categories();
                
                print '<form action="admin.php?import=wp-cat2tag&amp;step=2" method="post">';
                print '<ul style="list-style:none">';
                
                $hier = _get_category_hierarchy();
                
                foreach ($this->all_categories as $category) {
                        if ((int) $category->category_parent == 0) {
                                print '<li><label><input type="checkbox" name="cats_to_convert[]" value="' . intval($category->cat_ID) . '" /> ' . $category->cat_name . ' (' . $category->category_count . ')</label>';
                                
                                if (isset($hier[$category->cat_ID])) {
                                        $this->_category_children($category, $hier);
                                }
                                
                                print '</li>';
                        }
                }
                
                print '</ul>';
                print '<p class="submit"><input type="submit" name="submit" value="' . __('Convert &raquo;') . '" /></p>';
                print '</form>';
        }
        
        function _category_children($parent, $hier) {
                print '<ul style="list-style:none">';
                
                foreach ($hier[$parent->cat_ID] as $child_id) {
                        $child =& get_category($child_id);
                        
                        print '<li><label><input type="checkbox" name="cats_to_convert[]" value="' . intval($child->cat_ID) . '" /> ' . $child->cat_name . ' (' . $child->category_count . ')</label>';
                        
                        if (isset($hier[$child->cat_ID])) {
                                $this->_category_children($child, $hier);
                        }
                        
                        print '</li>';
                }
                
                print '</ul>';
        }
        
        function convert_them() {
                global $wpdb;
                
                if (!isset($_POST['cats_to_convert']) || !is_array($_POST['cats_to_convert'])) {
                        print '<div class="narrow">';
                        print '<p>' . sprintf(__('Uh, oh. Something didn\'t work. Please <a href="%s">try again</a>.'), 'admin.php?import=wp-cat2tag') . '</p>';
                        print '</div>';
                }
                
                $this->categories_to_convert = $_POST['cats_to_convert'];
                $hier = _get_category_hierarchy();
                
                print '<ul>';
                
                foreach ($this->categories_to_convert as $cat_id) {
                        $cat_id = (int) $cat_id;
                        
                        print '<li>' . __('Converting category') . ' #' . $cat_id . '... ';
                        
                        if (!category_exists($cat_id)) {
                                _e('Category doesn\'t exist!');
                        } else {
                                $category =& get_category($cat_id);
                                
                                if ($category->link_count > 0) {
                                        $type = $category->type | TAXONOMY_TAG;
                                } else {
                                        $type = TAXONOMY_TAG;
                                }
                                
                                $wpdb->query("UPDATE $wpdb->categories SET type = '$type' WHERE cat_ID = '{$category->cat_ID}'");
                                
                                $wpdb->query("UPDATE $wpdb->post2cat SET rel_type = 'tag' WHERE cat_ID = '{$category->cat_ID}'");
                                $wpdb->query("UPDATE $wpdb->categories SET tag_count = '{$category->category_count}', category_count = '0' WHERE cat_ID = '{$category->cat_ID}'");
                                
                                _e('Converted successfully.');
                        }
                        
                        print '</li>';
                }
                
                print '</ul>';
        }
        
        function init() {
                if (!isset($_GET['step'])) {
                        $step = 1;
                } else {
                        $step = (int) $_GET['step'];
                }
                
                $this->header();
                
                switch ($step) {
                        case 1:
                                $this->welcome();
                                break;
                        case 2:
                                $this->convert_them();
                                break;
                }
                
                $this->footer();
        }
}

$wp_cat2tag_importer = new WP_Categories_to_Tags;

register_importer('wp-cat2tag', __('Categories to Tags Converter'), __('Convert existing categories to tags, selectively.'), array(&$wp_cat2tag_importer, 'init'));

?>