ISTWCMS-3682: modify the login form to mimic wcms2 with adfs

templates/form/form--user-login-form.html.twig

+{#
+/**
+ * @file
+ * Theme override for a 'form' element.
+ *
+ * Available variables
+ * - attributes: A list of HTML attributes for the wrapper element.
+ * - children: The child elements of the form.
+ *
+ * @see template_preprocess_form()
+ */
+#}
+<form{{ attributes }}>
+  {{ children }}
+</form>
+<button id="adfs-login-link" class="button--primary"  onClick='ADFSButton_onClick()'>Log In Via ADFS</button>
+<button id="local-login-link">Log In Locally</button>

uw_fdsu_theme_resp.libraries.yml

@@ -21,3 +21,6 @@ uw_dashboards:
   css:
     theme:
       ../../modules/custom/uw_wcms_gesso/css/uw-dashboards.min.css: {}
+user.login:
+  js:
+    js/user-login.js: {}

uw_fdsu_theme_resp.theme

@@ -24,6 +24,32 @@ require_once dirname(__FILE__) . '/includes/navigation.inc';
 require_once dirname(__FILE__) . '/includes/taxonomy.inc';
 require_once dirname(__FILE__) . '/includes/views.inc';
 
+/**
+ * Implements hook_theme_suggestions_form_alter().
+ *
+ * Add suggestion for forms.
+ */
+function uw_fdsu_theme_resp_theme_suggestions_form_alter(array &$suggestions, array $variables) {
+
+   // form--user-login-form.html.twig.
+   $suggestions[] = 'form__'. str_replace('-','_', $variables['element']['#id']);
+}
+
+/**
+ * Implements hook_theme().
+ *
+ * Custom twig for forms.
+ */
+function uw_fdsu_theme_resp_theme($existing, $type, $theme, $path) {
+
+  return [
+    'form__user-login-form' => [
+      '#theme' => 'form--user-login-form',
+      'render element' => 'form',
+    ],
+  ];
+}
+
 /**
  * Implements hook_preprocess_HOOK().
  *
@@ -36,6 +62,13 @@ function uw_fdsu_theme_resp_preprocess_html(&$variables) {
   $variables['uw_admin_page'] = \Drupal::service('uw_cfg_common.uw_analytics')->administrationPage();
 
   _uw_fdsu_theme_resp_add_favicons($variables);
+
+
+  // Add Javascript only on user login page
+  $route_name = \Drupal::routeMatch()->getRouteName();
+  if ($route_name == 'user.login') {
+    $variables['#attached']['library'][] = 'uw_fdsu_theme_resp/user.login';
+  }
 }
 
 /**