Club Drupal

<?php

if (module_exists('comment')) {

  /**

   * Plugins are described by creating a $plugin array which will be used

  $node = clone $context->data;

  $block = new stdClass();

  $block->module = 'comments';

  $block->title = t('Add comment');

  if ($node->comment == COMMENT_NODE_OPEN) {

      );

      $block->content = drupal_build_form('comment_node_' . $node->type . '_form', $form_state);

    }

      $block->content = theme('comment_post_forbidden', array('node' => $node));

    }

  }

    $form_state['conf'][$key] = $form_state['values'][$key];

  }

}