Clameurs/sites/all/themes/figureslibres/clameurs/preprocess/node.pre.php

<?php

// dsm($vars);
$node = $vars['node'];


$vars['theme_hook_suggestions'][] = 'node__'.$vars['view_mode'];
$vars['theme_hook_suggestions'][] = 'node__' . $vars['type'] . '__' . $vars['view_mode'];

$vars['print_title'] = true;

$alias = drupal_get_path_alias('node/'.$vars['node']->nid);

if($node->type == "thematique"){
  $vars['id'] =  $alias;
}else{
  $vars["classes_array"][] = $alias;
  $vars['id'] =  "node-".$node->nid;

  if($vars['view_mode'] == "accueil"){
    $vars['print_title'] = false;
  }
}

$vars["classes_array"][] = "node-".$node->nid;