Testing

gistfile1.txt

<?php
// 
// This module, taxonomy_menu_patch, should have a dependency of `tm_custom_paths`

function taxonomy_menu_patch_module_implements_alter(&$implementations, $hook) {
  if ('form_taxonomy_form_vocabulary_alter' == $hook) {
    // We need to ensure that taxonomy_menu_patch is that last one to be called
    // as this way we can ensure that 'tm_custom_paths_vocabulary_validate'
    // callback is removed from the $form's #validate callback stack.
    $group = $implementations['taxonomy_menu_patch'];
    unset($implementations['taxonomy_menu_patch']);
    $implementations['taxonomy_menu_patch'] = $group;
  }
}

function taxonomy_menu_patch_form_taxonomy_form_vocabulary_alter(&$form, &$form_state) {
  // Should `tm_custom_path`'s implementation exists for vocabulary validate callback,
  // let's search it to ensure that it exists and remove it.


  if ($key = array_search('tm_custom_paths_vocabulary_validate', $form['#validate'])) {
    unset($form['#validate'][$key]);
  }

   // let's search it to ensure that it exists and remove it.
  if ($key = array_search('taxonomy_form_vocabulary_validate', $form['#validate'])) {
    unset($form['#validate'][$key]);
  }

  array_unshift($form['#validate'], 'taxonomy_menu_patch_vocabulary_validate');
  



}

/**
 * Direct copy of tm_custom_paths_vocabulary_validate with the exception
 * of the patch https://drupal.org/files/issues/2194077-validating-custom-paths.patch
 * fix applied directly here by rewriting the $path = drupal_get_normal_path( ...
 */
function taxonomy_menu_patch_vocabulary_validate($form, $form_state) {
  $options = $form_state['values']['taxonomy_menu'];
  $base = $options['options_custom_path']['custom_path_base'];
  $depth = $options['options_custom_path']['custom_path_depth'];
  // Don't allow base path value to be empty when a custom path is selected.
  // Check that the required path are registered in Drupal before processing.
  if ($options['path'] == 'taxonomy_menu_path_custom') {
    
    if (empty($base)) {
      form_set_error('custom_path_base', 'A base path must be provided when using a custom path.');
    }
    elseif (empty($depth)) {
      
      $path = drupal_get_normal_path($base);

      if (!_taxonomy_menu_valid_path($path)) {
        form_set_error('custom_path_base', 'The path ' . $path . ' is not available in Drupales. This is required to use custom paths.');
      }
    }
    else {
      $path = drupal_get_normal_path($base . '/%/%');
      if (!_taxonomy_menu_valid_path($path)) {
        form_set_error('custom_path_depth', 'The path ' . $path . ' is not available in Drupal. This is required to use custom paths.');
      }
    }
  }
}