Drupal Flag custom form

name = Rad Module
description = Supplements the flag module to create a custom rad flag form
core = 7.x
package = Rad Modules
php = 5.2.4
version = 7.x-1.0
dependencies[] = flag

<?php
 
/**
 * Implements hook_theme(); 
 */
function rad_module_theme() {
  return array(
    'rad_module_rad_flag_form' => array(
      'render element' => 'form',
      'template' => 'rad-module-rad-flag-form',
    ),
  );
}
 
/**
 * Form to flag a node as rad
 */
function rad_module_rad_flag_form($form, &$form_state) {
  // get current node
  $node = menu_get_object();
  // get the node id
  $nid = isset($node->nid) ? $node->nid : FALSE;
  // load the rad flag object
  $flag = flag_get_flag('rad');
  $rad = 0;
  // check if the node is currently flagged
  if ($flag && $nid && $flag->is_flagged($nid)) {
    $rad = 1;
  }
  $form['rad'] = array(
    '#type' => 'checkbox',
    '#required' => FALSE,
    '#default_value' => $rad,
    // set our custom form_element wrapper
    '#theme_wrappers' => array('rad_module_rad_form_element'),
  );
 
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Submit'),
  );
 
  return $form;
}
 
/**
 * Submit handler for rad_module_rad_flag_form().
 */
function rad_module_rad_flag_form_submit($form, &$form_state) {
  // load the current node
  $node = menu_get_object();
  // check to see if this form was rendered on a node
  try {
    $nid = $node->nid;
    $type = $node->type;
  } catch (Exception $exc) {
    watchdog('rad_module', 'Only nodes can be rad' . $exc->getTraceAsString());
    return;
  }
  // get a rad flag object
  $flag = flag_get_flag('rad');
  // unflag or flag the node according to the state of the checkbox in the form
  if ($form_state['values']['rad'] == 0) {
    $flag->flag('unflag', $nid);
    drupal_set_message('You think this is rad');
  } else {
    $flag->flag('flag', $nid);
    drupal_set_message('You do not think this is rad');
  }
}
 
/**
 * Custom theme wrapper for the rad checkbox
 * @see theme_form_element().
 */
function theme_rad_module_rad_form_element($variables) {
  $element = $variables['element'];
  $output = $element['#children'] . "\n";
  return $output;
}
 
?>

<p class="checkbox">
  <label for="rad">
    <?php print render($form['rad']); ?>Recommend this paper
  </label>
</p>
<p class="buttons">
  <?php print render($form['submit']); ?>
</p>
<?php print drupal_render_children($form); ?>