google.module

<?php
/**
 * @file google.module
 *   Provide access to the Google APIs, should be completely configurable.
 * 
 * @author Raymond Jelierse
 */

/**
 * Implements hook_init()
 */
function google_init() {
  if (variable_get('google_plusone_button_enabled', FALSE)) {
    drupal_set_html_head('<script type="text/javascript" src="https://apis.google.com/js/plusone.js"></script>');
  }
}
/**
 * Implements hook_menu()
 */
function google_menu() {
  $menu = array(
    'admin/settings/google' => array(
      'title' => 'Google',
      'description' => 'Manage the available Google APIs',
      'page callback' => 'drupal_get_form',
      'page arguments' => array('google_settings_form'),
      'access arguments' => array('administer google configuration'),
    ),
    'admin/settings/google/manage-apis' => array(
      'title' => 'Manage',
      'type' => MENU_DEFAULT_LOCAL_TASK,
      'weight' => -50,
    ),
    'admin/settings/google/plus-one' => array(
      'title' => 'Google +1',
      'page callback' => 'drupal_get_form',
      'page arguments' => array('google_plusone_button_settings_form'),
      'access arguments' => array('administer google configuration'),
      'type' => MENU_LOCAL_TASK,
      'weight' => -49,
    ),
  );
  
  return $menu;
}

/**
 * Implements hook_namespaces()
 */
function google_namespaces() {
  return array(
    'g' => 'http://base.google.com/ns/1.0',
    'gm' => 'http://base.google.com/ns-metadata/1.0',
  );
}

/**
 * Implements hook_theme()
 */
function google_theme() {
  return array(
    'plusone_button' => array(),
  );
}

/**
 * General settings for the Google APIs.
 * 
 * @return 
 *   The settings form 
 */
function google_settings_form() {
  return system_settings_form(array(
    'google_apis' => array(
      '#type' => 'fieldset',
      '#title' => t('Available APIs'),
      '#collapsible' => TRUE,
      'google_plusone_button_enabled' => array(
        '#type' => 'checkbox',
        '#title' => t('Google +1 Button'),
        '#default_value' => variable_get('google_plusone_button_enabled', FALSE),
      ),
    ),
  ));
}

/**
 * Google +1 Button settings
 * 
 * @return
 *   The settings form
 */
function google_plusone_button_settings_form() {
  return system_settings_form(array(
    'google_plusone_button_size' => array(
      '#type' => 'select',
      '#title' => t('Button size'),
      '#default_value' => variable_get('google_plusone_button_size', 'tall'),
      '#options' => array(
        'small' => t('Small'),
        'medium' => t('Medium'),
        'standard' => t('Standard'),
        'tall' => t('Tall'),
      ),
    ),
    'google_plusone_button_count' => array(
      '#type' => 'checkbox',
      '#title' => t('Show number of +1\'s'),
      '#default_value' => variable_get('google_plusone_button_count', TRUE),
      '#description' => t('Note. This setting only applies to some of the button sizes, see the <a href="@plusone-doc">documentation</a> for more information.', array('@plusone-doc' => 'http://code.google.com/apis/+1button/#button-sizes'))
    ),
  ));
}

function google_nodeapi(&$node, $operation, $data1 = NULL, $data2 = NULL) {
  switch ($operation) {
    case 'view':
      if (variable_get('google_plusone_button_enabled', FALSE)) {
        $node->content['google_plusone'] = array(
          '#value' => theme('plusone_button'),
        );
        $node->google_plusone_rendered = drupal_render($node->content['google_plusone']);
      }
      break;
  }
}

function theme_plusone_button() {
  $content  = '<g:plusone';
  $content .= ' size="' . variable_get('google_plusone_button_size', 'tall') . '"';
  $content .= ' count="' . (variable_get('google_plusone_button_count', TRUE) ? 'true' : 'false') . '"';
  $content .= '></g:plusone>';
  
  return $content;
}