bs5.theme

<?php

/**
 * Implements hook_preprocess_HOOK() for menu-local-task templates.
 */
function bs5_preprocess_menu_local_task(&$variables) {
  // Ensure appropriate classes are set on primary tasks (nav tabs)
  if (isset($variables['is_active']) && $variables['is_active'] === TRUE) {
    $variables['link']['#options']['attributes']['class'][] = 'active is-active';
  }
  else {
    $variables['link']['#options']['attributes']['class'][] = 'nav-link';
  }
  // Add the level attribute
  if (isset($variables['element']['#level'])) {
    $variables['level'] = $variables['element']['#level'];
  }
}

/**
 * Implements theme_preprocess_textarea().
 */
function bs5_preprocess_textarea(&$variables) {
  $variables['attributes']['class'][] = 'form-control';
}

/**
 * Implements template_preprocess_HOOK() for input.
 */
function bs5_preprocess_input(&$variables) {
  $type_html = $variables['attributes']['type'];
  $text_types_html = [
    'text',
    'email',
    'tel',
    'number',
    'search',
    'password',
    'url',
    'month',
    'week',
  ];
  if (in_array($type_html, $text_types_html)) {
    $variables['attributes']['class'][] = 'form-control';
  }
  if (in_array($type_html, ['checkbox'])) {
    $variables['attributes']['class'][] = 'form-check-input';
  }
}

/**
 * Implements theme_preprocess_datetime_form().
 */
function bs5_preprocess_datetime_form(&$variables) {
  $variables['attributes']['class'][] = 'form-inline';
}