ISTWCMS-4156 Create and pre-load audience taxonomy terms same as those in D7

uw_cfg_common.install

@@ -95,4 +95,82 @@ function uw_cfg_common_install() {
     ],
   ];
   UwPermissions::grantRevoke($permissions_to_process, 'grant');
+
+  // Add terms to the vocabulary 'uw_vocab_audience'.
+  $terms = [
+    'Current students' => [
+      'Current undergraduate students',
+      'Current graduate students',
+    ],
+    'Future students' => [
+      'Future undergraduate students',
+      'Future graduate students',
+    ],
+    'Faculty',
+    'Staff',
+    'Alumni',
+    'Parents',
+    'Donors | Friends | Supporters',
+    'Employers',
+    'International',
+    'Media',
+  ];
+
+  $weight = 0;
+  foreach ($terms as $key => $term) {
+   if (is_array($term)) {
+     $parent = _uw_cfg_common_create_term($key, 'uw_vocab_audience', $weight, []);
+
+     foreach ($term as $child) {
+       _uw_cfg_common_create_term($child, 'uw_vocab_audience', $weight, [$parent]);
+     }
+   }
+   else {
+    _uw_cfg_common_create_term($term, 'uw_vocab_audience', $weight, []);
+   }
+   $weight++;
+  }
+}
+
+/**
+ * @file
+ * Contains various helper functions.
+ */
+
+/**
+ * Helper function to create a taxonomy term programmatically.
+ *
+ * @code
+ * // Create top level term
+ * $term_id = _nodemaker_term_create('My Term', 'my_vocab', 0, []);
+ *
+ * // Create term with parent term with an id of 999
+ * $term_id = _nodemaker_term_create('My Term', 'my_vocab', 0, [999]);
+ * @endcode
+ *
+ * @param string $term
+ *   - Term Name.
+ * @param string $vocabulary
+ *   - System id of the vocabulary term will be added to.
+ * @param array $parent
+ *   - Array of term ids to be assigned as parent.
+ *
+ * @return int|null
+ *   - Returns the term id of the created term on success, null on failure.
+ */
+function _uw_cfg_common_create_term($taxonomy_name, $vocab_machine_name, $weight, array $parent_tid = []) {
+
+  // Create the taxonomy term.
+  $new_term = Drupal\taxonomy\Entity\Term::create([
+    'name' => $taxonomy_name,
+    'vid' => $vocab_machine_name,
+    'parent' => $parent_tid,
+    'weight' => $weight,
+  ]);
+
+  // Save the taxonomy term.
+  $new_term->save();
+
+  // Return the taxonomy term id.
+  return $new_term->id();
 }