Deregister features info for disabled obsolete modules

mycustom.module

<?php

/**
 * Implements hook_system_info_alter().
 */
function mycustom_system_info_alter(&$info, $file, $type) {
  static $files_status = array();

  // We want to remove features info from disabled obsolete modules, so we get a
  // clean component list with all available components.

  // First check if there is any features info first and quit otherwise.
  if (!isset($info['features'])) {
    return;
  }

  // Get file status, so we can check if it is enabled currently.
  if (empty($files_status)) {
    $files_status = db_query("SELECT filename, name, type, status, schema_version, weight FROM {system} WHERE type = :type", array(':type' => 'module'))
        ->fetchAllAssoc('filename');
  }

  // Quit if we have no file status yet.
  if (!isset($files_status[$file->filename])) {
    return;
  }
  // Also do nothin if the module is enabled.
  elseif (!empty($files_status[$file->filename]->status)) {
    return;
  }

  // We only want to "kick" obsolete modules, so ignore anyone else.
  if (strpos($file->filename, 'obsolete') === FALSE) {
    return;
  }

  // otherwise remove the features info.
  unset($info['features']);
}