<?php
/**
 * Implement hook_permission
 * Defines a new permission that can be selected per role at the page
 * admin/people/permissions
 */
function MY_MODULE_permission() {
  return array(
    'skip required comment approval' => array(
      'title' => t('Skip "Require comment approval"'),
      'description' => t('For nodes with "Require comment approval" set, this user's comments skip moderation'),
    ),
  );
}



/**
 * Implement hook_form_alter for BASE_FORM_ID node_form
 * This modifies all node add/edit forms
 */
function MY_MODULE_form_node_form_alter(&$form, &$form_state) {
  // Move 'Require comment approval' field into the comment settings fieldset
  if (isset($form['field_require_comment_approval'])) {
    $form['comment_settings']['field_require_comment_approval'] = $form['field_require_comment_approval'];
    unset($form['field_require_comment_approval']);
  }
}



/**
 * Implement hook_comment_presave
 * This hook runs before a comment is saved to the database, allowing us to
 * modify the comment as it is being saved
 */
function MY_MODULE_comment_presave($comment) {
  // If the parent node has the field "Require comment approval" checkbox set,
  // make the new comment's status set to "unpublished"
  if (empty($comment->cid)) {
    $node = node_load($comment->nid);
    if ($node && ($items = field_get_items('node', $node, 'field_require_comment_approval'))) {
      $item = !empty($items) ? reset($items) : array('value' => FALSE);
      if ($item['value']) {
        $account = user_load($comment->uid);
        // Comments for users with the 'skip required comment approval' permission
        // skip this step
        if ($account && !user_access('skip required comment approval', $account)) {
          $comment->status = COMMENT_NOT_PUBLISHED;
        }
      }
    }
  }
}