Issue #3340975: Allow manually adding plugins

src/Form/Admin.php

@@ -76,18 +76,123 @@ class Admin extends ConfigFormBase {
       ],
     ];
 
+    // Keyword detection settings.
+    $key_values = $config->get('custom_libs');
+    if ($form_state->get('key_values') === NULL) {
+      $form_state->set('key_values', is_array($key_values) ? $key_values : []);
+    }
+    $form['custom_libs'] = [
+      '#type' => 'details',
+      '#title' => $this->t('Additional Libraries'),
+      '#description' => $this->t("The name will be created as a library of 'gsap/[key]'. These will NOT be added to the page automatically."),
+      '#open' => TRUE,
+      '#tree' => TRUE,
+      '#attributes' => ['id' => 'edit-custom'],
+    ];
+    foreach ($form_state->get('key_values') as $delta => $key_value) {
+      $form['custom_libs'][$delta] = [
+        '#type' => 'details',
+        '#title' => $this->t('Name: @key', [
+          '@key' => isset($key_values[$delta]) ? key($key_values[$delta]) : $this->t('**Not yet saved**'),
+        ]),
+        '#open' => TRUE,
+      ];
+      $form['custom_libs'][$delta]['key'] = [
+        '#type' => 'textfield',
+        '#title' => $this->t('Library Key'),
+        '#description' => $this->t("Will be added as gsap/[key]"),
+        '#element_validate' => ['::validateLibKey'],
+        '#default_value' => isset($key_values[$delta]) ? key($key_values[$delta]) : NULL,
+      ];
+      $form['custom_libs'][$delta]['value'] = [
+        '#type' => 'textfield',
+        '#title' => $this->t('Path to library'),
+        '#description' => $this->t('Either URL or absolute path from docroot.'),
+        '#default_value' => isset($key_values[$delta]) ? reset($key_values[$delta]) : NULL,
+      ];
+      $form['custom_libs'][$delta]['remove'] = [
+        '#type' => 'submit',
+        '#value' => $this->t('Remove'),
+        '#name' => "remove_$delta",
+        '#submit' => [[$this, 'removeLib']],
+        '#ajax' => [
+          'callback' => [$this, 'ajaxLibs'],
+          'wrapper' => 'edit-custom',
+        ],
+        '#attributes' => ['class' => ['field-add-more-submit']],
+      ];
+    }
+    $form['custom_libs']['add'] = [
+      '#type' => 'submit',
+      '#value' => $this->t('Add new library'),
+      '#submit' => [[$this, 'addLib']],
+      '#ajax' => [
+        'callback' => [$this, 'ajaxLibs'],
+        'wrapper' => 'edit-custom',
+      ],
+      '#attributes' => ['class' => ['field-add-more-submit']],
+    ];
+
     return $form;
   }
 
+  /**
+   * Validates lib keys.
+   */
+  public static function validateLibKey($element, &$form_state) {
+    $value = $element['#value'];
+    if (!preg_match('/^[a-z_]+$/', $value)) {
+      $form_state->setError($element, t('Please enter lower case letters only and no spaces.'));
+    }
+  }
+
+  /**
+   * Submit for libs.
+   */
+  public function ajaxLibs(array &$form, FormStateInterface $form_state) {
+    return $form['custom_libs'];
+  }
+
+  /**
+   * Remove lib callback.
+   */
+  public function removeLib(array &$form, FormStateInterface $form_state) {
+    $form_state->setRebuild(TRUE);
+    $delta = $form_state->getTriggeringElement()['#array_parents'][1];
+    $key_values = $form_state->get('key_values');
+    unset($key_values[$delta]);
+    $form_state->set('key_values', $key_values);
+  }
+
+  /**
+   * Add lib callback.
+   */
+  public function addLib(array &$form, FormStateInterface $form_state) {
+    $form_state->setRebuild(TRUE);
+    $key_values = $form_state->get('key_values');
+    $key_values[] = [];
+    $form_state->set('key_values', $key_values);
+  }
+
   /**
    * {@inheritdoc}
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
     $libraries = array_values(array_filter($form_state->getValue('libs')));
+
+    $custom = $form_state->cleanValues()->getValue('custom_libs');
+    $custom_libs = [];
+    foreach ($custom as $lib) {
+      if (!empty($lib['key']) && !empty($lib['value'])) {
+        $custom_libs[] = [$lib['key'] => $lib['value']];
+      }
+    }
+
     $this->configFactory->getEditable('gsap.settings')
       ->set('libs', $libraries)
       ->set('include_gsap', $form_state->getValue('include_gsap'))
       ->set('include_libs', $form_state->getValue('include_libs'))
+      ->set('custom_libs', $custom_libs)
       ->save();
 
     parent::submitForm($form, $form_state);