View source  
  <?php
function hashtags_enable() {
  if (!variable_get('hashtags_vocabulary', 0)) {
    
    $vocabulary = array(
      'name' => t('Hashtags'),
      'multiple' => 1,
      'tags' => 1,
      'required' => 0,
      'hierarchy' => 1,
      'relations' => 0,
      'module' => 'hashtags',
      'weight' => -10,
    );
    taxonomy_save_vocabulary($vocabulary);
    variable_set('hashtags_vocabulary', $vocabulary['vid']);
    
    hashtags_add_filter();
    drupal_set_message('Hashtags module: go to ' . l(t('hashtags vocabulary'), 'admin/content/taxonomy/edit/vocabulary/' . $vocabulary['vid']) . ', check content types that you want Hashtags to work and submit a form');
  }
}
function hashtags_uninstall() {
  
  drupal_load('module', 'taxonomy');
  
  $vid = variable_get('hashtags_vocabulary', '');
  taxonomy_del_vocabulary($vid);
  variable_del('hashtags_vocabulary');
  
  $module = 'hashtags';
  db_query("DELETE FROM {filters} WHERE module = '%s'", $module);
  drupal_set_message(t('Hashtags module: Hashtags filter has been removed from all input format'));
}
function hashtags_update_6001() {
  $ret = array();
  
  hashtags_add_filter();
  $ret[] = array(
    'success' => TRUE,
    'query' => 'Hashtags filter has been added to system input formats.',
  );
  return $ret;
}