materio-base-d7/sites/all/modules/gui/materiobasemod/materio_personalnotes.module

<?php


/**
 * Implements hook_init().
 */
function materio_personalnotes_init() {
  drupal_add_js(drupal_get_path('module', 'materio_personalnotes').'/js/materio_personalnotes.js');
}


/**
 * Implements hook_permission().
 */
function materio_personalnotes_permission() {
  $perms =  array(
    'create own personal notes' =>  array(
      'title' => t('Create own personal notes'),
      'description' => t('Create own personal notes'),
    ),
  );

  return $perms;
}

function materio_personalnotes_menu(){
  $items = array();

  $base = array(
    'type' => MENU_CALLBACK,
    'file' => 'materio_personalnotes.pages.inc',
  );

  $items['materio_personalnotes/form/%/%'] = $base+array(
    'access arguments' => array('create own personal notes'),
    'access callback' => 'user_access',
    'title' => 'Materio base create/edit note ajax',
    'page callback' => 'materio_personalnotes_createeditnote',
    'page arguments' => array(2,3),
  );

  $items['materio_personalnotes/save/%'] = $base+array(
    'access arguments' => array('create own personal notes'),
    'access callback' => 'user_access',
    'title' => 'Materio base save note ajax',
    'page callback' => 'materio_personalnotes_savenote',
    'page arguments' => array(2),
  );

  return $items;
}

/**
 * Implements hook_menu_alter().
 */
// function materio_personalnotes_menu_alter(&$items) {
//   $items['user/%user']['access callback'] = 'user_access';
//   $items['user/%user']['access arguments'] = array('view own user profile');
// }

/**
 * Implements hook_entity_view().
 *
 * Note this is broken for taxonomy terms. @see http://drupal.org/node/1067120
 */
function materio_personalnotes_entity_view($entity, $type, $view_mode, $langcode) {
  // dsm($entity, 'entity');
  if($type == 'node' && $entity->type == "materiau" && in_array($view_mode, array('cardmedium', 'cardbig', 'cardfull'))){
    if(user_access('create own personal notes') && $view_mode != 'print'){
      $entity->content['personalnotelink'] = materio_personalnotes_get_note_link($entity);

      // drupal_add_css(drupal_get_path('module', 'flag') . '/theme/flag.css');
      // drupal_add_js(drupal_get_path('module', 'flag') . '/theme/flag.js');

    }
  }
}

function materio_personalnotes_get_note_link($entity){
  global $user;
  // dsm($user);
  // get note already created for this entity by current user
  $query = new EntityFieldQuery();
  $query
    ->entityCondition('entity_type', 'node')
    ->entityCondition('bundle', 'note')
    // ->propertyCondition('status', NODE_PUBLISHED);
    ->propertyCondition('uid', $user->uid)
    ->fieldCondition('field_target_content_nid', 'value', $entity->nid)
    ->addMetaData('account', user_load(1));
  $result = $query->execute();
  // dsm($result, 'result');

  if (isset($result['node'])) {
    // if note alredy exists link to it
    $note = array_shift($result['node']);
    // dsm($note, 'note');
    $link = array(
      '#path' => '/node/'.$note->nid.'/edit',
      '#attributes' => array(
        'class' => array('personal-note-link', 'personal-note-edit'),
        'title' => t('Edit your @title\'s notes.', array('@title'=>$entity->title)),
        'src_nid' => $entity->nid,
        'note_nid' => $note->nid,
      ),
    );
  }else{
    // else create one
    $link = array(
      // get the content type from settings OR create the content type with module install
      '#path' => '/node/add/note',
      '#query' => array(
        'target_id'=>$entity->nid,
      ),
      '#attributes' => array(
        'class' => array('personal-note-link', 'personal-note-create'),
        'title' => t('create a note for @title.', array('@title'=>$entity->title)),
        'src_nid' => $entity->nid,
      ),
    );
  }

  if(isset($link)){
    $link['#theme'] = 'materio_personalnotes_note_link';
    // dsm($link, 'link');
    drupal_add_js(drupal_get_path('module', 'materio_personalnotes').'/js/dist/materio_personalnotes.min.js');
    return $link;
  }

  return;
}

/**
 * Implements hook_form_alter().
 */
function materio_personalnotes_form_alter(&$form, &$form_state, $form_id) {
  // dsm($form_id);
  if($form_id == "note_node_form" && isset($_GET['target_id']) && $target_id = $_GET['target_id']){
    // dsm($_GET, 'get');
    // dsm($target_id, 'target_id');
    // dsm($form, 'form');
    // dsm($form_state, 'form_state');

    $form['field_target_content_nid']['und'][0]['value']['#default_value'] = $target_id;
    $form['field_target_content_nid']['und'][0]['value']['#type'] = 'hidden';
  }
}

/**
 * Implements hook_theme().
 */
function materio_personalnotes_theme($existing, $type, $theme, $path) {
  return array(
    'materio_personalnotes_note_link' => array(
      'variables' => array('path' => NULL, 'query' => array(), 'attributes' => array()),
    ),
  );
}

function theme_materio_personalnotes_note_link($vars){
  return l(
    '<i class="fi-pencil"></i>',
    $vars['path'],
    array(
      'attributes' => $vars['attributes'],
      'html' => true,
      'query' => $vars['query'],
    )
  );
}


/**
 * Implements hook_block_info().
 */
// function materio_personalnotes_block_info() {
//
// TODO: add my notes block
//   $blocks[''] = array(
//     'info' => t(''),
//     'cache' => DRUPAL_NO_CACHE
//   );
//
//   return $blocks;
// }