system/handlers/admintagshandler.php

<?php
namespace Habari;

class AdminTagsHandler extends AdminHandler
{
  public function get_tags()
  {
    $this->theme->wsse = Utils::WSSE();

    $this->theme->tags = Tags::vocabulary()->get_tree( 'term_display asc' );
    $this->theme->max = Tags::vocabulary()->max_count();

    $this->display( 'tags' );
  }

  public function ajax_get_tags( $handler_vars )
  {
    Utils::check_request_method( array( 'GET', 'HEAD' ) );
    $response = new AjaxResponse();

    $wsse = Utils::WSSE( $handler_vars['nonce'], $handler_vars['timestamp'] );
    if ( $handler_vars['digest'] != $wsse['digest'] ) {
      $response->message = _t( 'WSSE authentication failed.' );
      $response->out();
      return;
    }

    $this->create_theme();

    $search = $handler_vars['search'];

    $this->theme->tags = Tags::vocabulary()->get_search( $search, 'term_display asc' );
    $this->theme->max = Tags::vocabulary()->max_count();
    $response->data = $this->theme->fetch( 'tag_collection' );
    $response->out();
  }

  public function ajax_tags( $handler_vars )
  {
    Utils::check_request_method( array( 'POST' ) );
    $response = new AjaxResponse();

    $wsse = Utils::WSSE( $handler_vars['nonce'], $handler_vars['timestamp'] );
    if ( $handler_vars['digest'] != $wsse['digest'] ) {
      $response->message = _t( 'WSSE authentication failed.' );
      $response->out();
      return;
    }

    $tag_names = array();
    $this->create_theme();
    $action = $this->handler_vars['action'];
    switch ( $action ) {
      case 'delete':
        foreach ( $_POST as $id => $delete ) {
          // skip POST elements which are not tag ids
          if ( preg_match( '/^tag_\d+/', $id ) && $delete ) {
            $id = substr( $id, 4 );
            $tag = Tags::get_by_id( $id );
            $tag_names[] = $tag->term_display;
            Tags::vocabulary()->delete_term( $tag );
          }
        }
        $response->message = _n( _t( 'Tag %s has been deleted.', array( implode( '', $tag_names ) ) ), _t( '%d tags have been deleted.', array( count( $tag_names ) ) ), count( $tag_names ) );
        break;

      case 'rename':
        if ( !isset( $this->handler_vars['master'] ) ) {
          $response->message = _t( 'Error: New name not specified.' );
          $response->out();
          return;
        }
        $master = $this->handler_vars['master'];
        $tag_names = array();
        foreach ( $_POST as $id => $rename ) {
          // skip POST elements which are not tag ids
          if ( preg_match( '/^tag_\d+/', $id ) && $rename ) {
            $id = substr( $id, 4 );
            $tag = Tags::get_by_id( $id );
            $tag_names[] = $tag->term_display;
          }
        }
        Tags::vocabulary()->merge( $master, $tag_names );
        $response->message = sprintf(
          _n('Tag %1$s has been renamed to %2$s.',
            'Tags %1$s have been renamed to %2$s.',
              count( $tag_names )
          ), implode( $tag_names, ', ' ), $master
        );
        break;

    }
    $this->theme->tags = Tags::vocabulary()->get_tree( 'term_display ASC' );
    $this->theme->max = Tags::vocabulary()->max_count();
    $response->data = $this->theme->fetch( 'tag_collection' );
    $response->out();
  }

}
?>