diff --git a/jsumfields.civix.php b/jsumfields.civix.php
index d207460..cd60aa7 100644
--- a/jsumfields.civix.php
+++ b/jsumfields.civix.php
@@ -2,10 +2,87 @@
 
 // AUTO-GENERATED FILE -- Civix may overwrite any changes made to this file
 
+/**
+ * The ExtensionUtil class provides small stubs for accessing resources of this
+ * extension.
+ */
+class CRM_Jsumfields_ExtensionUtil {
+  const SHORT_NAME = "jsumfields";
+  const LONG_NAME = "com.joineryhq.jsumfields";
+  const CLASS_PREFIX = "CRM_Jsumfields";
+
+  /**
+   * Translate a string using the extension's domain.
+   *
+   * If the extension doesn't have a specific translation
+   * for the string, fallback to the default translations.
+   *
+   * @param string $text
+   *   Canonical message text (generally en_US).
+   * @param array $params
+   * @return string
+   *   Translated text.
+   * @see ts
+   */
+  public static function ts($text, $params = []) {
+    if (!array_key_exists('domain', $params)) {
+      $params['domain'] = [self::LONG_NAME, NULL];
+    }
+    return ts($text, $params);
+  }
+
+  /**
+   * Get the URL of a resource file (in this extension).
+   *
+   * @param string|NULL $file
+   *   Ex: NULL.
+   *   Ex: 'css/foo.css'.
+   * @return string
+   *   Ex: 'http://example.org/sites/default/ext/org.example.foo'.
+   *   Ex: 'http://example.org/sites/default/ext/org.example.foo/css/foo.css'.
+   */
+  public static function url($file = NULL) {
+    if ($file === NULL) {
+      return rtrim(CRM_Core_Resources::singleton()->getUrl(self::LONG_NAME), '/');
+    }
+    return CRM_Core_Resources::singleton()->getUrl(self::LONG_NAME, $file);
+  }
+
+  /**
+   * Get the path of a resource file (in this extension).
+   *
+   * @param string|NULL $file
+   *   Ex: NULL.
+   *   Ex: 'css/foo.css'.
+   * @return string
+   *   Ex: '/var/www/example.org/sites/default/ext/org.example.foo'.
+   *   Ex: '/var/www/example.org/sites/default/ext/org.example.foo/css/foo.css'.
+   */
+  public static function path($file = NULL) {
+    // return CRM_Core_Resources::singleton()->getPath(self::LONG_NAME, $file);
+    return __DIR__ . ($file === NULL ? '' : (DIRECTORY_SEPARATOR . $file));
+  }
+
+  /**
+   * Get the name of a class within this extension.
+   *
+   * @param string $suffix
+   *   Ex: 'Page_HelloWorld' or 'Page\\HelloWorld'.
+   * @return string
+   *   Ex: 'CRM_Foo_Page_HelloWorld'.
+   */
+  public static function findClass($suffix) {
+    return self::CLASS_PREFIX . '_' . str_replace('\\', '_', $suffix);
+  }
+
+}
+
+use CRM_Jsumfields_ExtensionUtil as E;
+
 /**
  * (Delegated) Implements hook_civicrm_config().
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_config
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_config
  */
 function _jsumfields_civix_civicrm_config(&$config = NULL) {
   static $configured = FALSE;
@@ -23,7 +100,7 @@ function _jsumfields_civix_civicrm_config(&$config = NULL) {
     array_unshift($template->template_dir, $extDir);
   }
   else {
-    $template->template_dir = array($extDir, $template->template_dir);
+    $template->template_dir = [$extDir, $template->template_dir];
   }
 
   $include_path = $extRoot . PATH_SEPARATOR . get_include_path();
@@ -35,7 +112,7 @@ function _jsumfields_civix_civicrm_config(&$config = NULL) {
  *
  * @param $files array(string)
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_xmlMenu
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_xmlMenu
  */
 function _jsumfields_civix_civicrm_xmlMenu(&$files) {
   foreach (_jsumfields_civix_glob(__DIR__ . '/xml/Menu/*.xml') as $file) {
@@ -46,7 +123,7 @@ function _jsumfields_civix_civicrm_xmlMenu(&$files) {
 /**
  * Implements hook_civicrm_install().
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_install
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_install
  */
 function _jsumfields_civix_civicrm_install() {
   _jsumfields_civix_civicrm_config();
@@ -58,12 +135,12 @@ function _jsumfields_civix_civicrm_install() {
 /**
  * Implements hook_civicrm_postInstall().
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_postInstall
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_postInstall
  */
 function _jsumfields_civix_civicrm_postInstall() {
   _jsumfields_civix_civicrm_config();
   if ($upgrader = _jsumfields_civix_upgrader()) {
-    if (is_callable(array($upgrader, 'onPostInstall'))) {
+    if (is_callable([$upgrader, 'onPostInstall'])) {
       $upgrader->onPostInstall();
     }
   }
@@ -72,7 +149,7 @@ function _jsumfields_civix_civicrm_postInstall() {
 /**
  * Implements hook_civicrm_uninstall().
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_uninstall
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_uninstall
  */
 function _jsumfields_civix_civicrm_uninstall() {
   _jsumfields_civix_civicrm_config();
@@ -84,12 +161,12 @@ function _jsumfields_civix_civicrm_uninstall() {
 /**
  * (Delegated) Implements hook_civicrm_enable().
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_enable
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_enable
  */
 function _jsumfields_civix_civicrm_enable() {
   _jsumfields_civix_civicrm_config();
   if ($upgrader = _jsumfields_civix_upgrader()) {
-    if (is_callable(array($upgrader, 'onEnable'))) {
+    if (is_callable([$upgrader, 'onEnable'])) {
       $upgrader->onEnable();
     }
   }
@@ -98,13 +175,13 @@ function _jsumfields_civix_civicrm_enable() {
 /**
  * (Delegated) Implements hook_civicrm_disable().
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_disable
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_disable
  * @return mixed
  */
 function _jsumfields_civix_civicrm_disable() {
   _jsumfields_civix_civicrm_config();
   if ($upgrader = _jsumfields_civix_upgrader()) {
-    if (is_callable(array($upgrader, 'onDisable'))) {
+    if (is_callable([$upgrader, 'onDisable'])) {
       $upgrader->onDisable();
     }
   }
@@ -116,10 +193,11 @@ function _jsumfields_civix_civicrm_disable() {
  * @param $op string, the type of operation being performed; 'check' or 'enqueue'
  * @param $queue CRM_Queue_Queue, (for 'enqueue') the modifiable list of pending up upgrade tasks
  *
- * @return mixed  based on op. for 'check', returns array(boolean) (TRUE if upgrades are pending)
- *                for 'enqueue', returns void
+ * @return mixed
+ *   based on op. for 'check', returns array(boolean) (TRUE if upgrades are pending)
+ *   for 'enqueue', returns void
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_upgrade
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_upgrade
  */
 function _jsumfields_civix_civicrm_upgrade($op, CRM_Queue_Queue $queue = NULL) {
   if ($upgrader = _jsumfields_civix_upgrader()) {
@@ -140,22 +218,23 @@ function _jsumfields_civix_upgrader() {
 }
 
 /**
- * Search directory tree for files which match a glob pattern
+ * Search directory tree for files which match a glob pattern.
  *
  * Note: Dot-directories (like "..", ".git", or ".svn") will be ignored.
  * Note: In Civi 4.3+, delegate to CRM_Utils_File::findFiles()
  *
- * @param $dir string, base dir
- * @param $pattern string, glob pattern, eg "*.txt"
- * @return array(string)
+ * @param string $dir base dir
+ * @param string $pattern , glob pattern, eg "*.txt"
+ *
+ * @return array
  */
 function _jsumfields_civix_find_files($dir, $pattern) {
-  if (is_callable(array('CRM_Utils_File', 'findFiles'))) {
+  if (is_callable(['CRM_Utils_File', 'findFiles'])) {
     return CRM_Utils_File::findFiles($dir, $pattern);
   }
 
-  $todos = array($dir);
-  $result = array();
+  $todos = [$dir];
+  $result = [];
   while (!empty($todos)) {
     $subdir = array_shift($todos);
     foreach (_jsumfields_civix_glob("$subdir/$pattern") as $match) {
@@ -166,7 +245,7 @@ function _jsumfields_civix_find_files($dir, $pattern) {
     if ($dh = opendir($subdir)) {
       while (FALSE !== ($entry = readdir($dh))) {
         $path = $subdir . DIRECTORY_SEPARATOR . $entry;
-        if ($entry{0} == '.') {
+        if ($entry[0] == '.') {
         }
         elseif (is_dir($path)) {
           $todos[] = $path;
@@ -177,25 +256,27 @@ function _jsumfields_civix_find_files($dir, $pattern) {
   }
   return $result;
 }
+
 /**
  * (Delegated) Implements hook_civicrm_managed().
  *
  * Find any *.mgd.php files, merge their content, and return.
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_managed
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_managed
  */
 function _jsumfields_civix_civicrm_managed(&$entities) {
   $mgdFiles = _jsumfields_civix_find_files(__DIR__, '*.mgd.php');
+  sort($mgdFiles);
   foreach ($mgdFiles as $file) {
     $es = include $file;
     foreach ($es as $e) {
       if (empty($e['module'])) {
-        $e['module'] = 'com.joineryhq.jsumfields';
+        $e['module'] = E::LONG_NAME;
       }
-      $entities[] = $e;
       if (empty($e['params']['version'])) {
         $e['params']['version'] = '3';
       }
+      $entities[] = $e;
     }
   }
 }
@@ -207,7 +288,7 @@ function _jsumfields_civix_civicrm_managed(&$entities) {
  *
  * Note: This hook only runs in CiviCRM 4.4+.
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_caseTypes
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_caseTypes
  */
 function _jsumfields_civix_civicrm_caseTypes(&$caseTypes) {
   if (!is_dir(__DIR__ . '/xml/case')) {
@@ -218,14 +299,13 @@ function _jsumfields_civix_civicrm_caseTypes(&$caseTypes) {
     $name = preg_replace('/\.xml$/', '', basename($file));
     if ($name != CRM_Case_XMLProcessor::mungeCaseType($name)) {
       $errorMessage = sprintf("Case-type file name is malformed (%s vs %s)", $name, CRM_Case_XMLProcessor::mungeCaseType($name));
-      CRM_Core_Error::fatal($errorMessage);
-      // throw new CRM_Core_Exception($errorMessage);
+      throw new CRM_Core_Exception($errorMessage);
     }
-    $caseTypes[$name] = array(
-      'module' => 'com.joineryhq.jsumfields',
+    $caseTypes[$name] = [
+      'module' => E::LONG_NAME,
       'name' => $name,
       'file' => $file,
-    );
+    ];
   }
 }
 
@@ -236,7 +316,7 @@ function _jsumfields_civix_civicrm_caseTypes(&$caseTypes) {
  *
  * Note: This hook only runs in CiviCRM 4.5+.
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_angularModules
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_angularModules
  */
 function _jsumfields_civix_civicrm_angularModules(&$angularModules) {
   if (!is_dir(__DIR__ . '/ang')) {
@@ -248,12 +328,31 @@ function _jsumfields_civix_civicrm_angularModules(&$angularModules) {
     $name = preg_replace(':\.ang\.php$:', '', basename($file));
     $module = include $file;
     if (empty($module['ext'])) {
-      $module['ext'] = 'com.joineryhq.jsumfields';
+      $module['ext'] = E::LONG_NAME;
     }
     $angularModules[$name] = $module;
   }
 }
 
+/**
+ * (Delegated) Implements hook_civicrm_themes().
+ *
+ * Find any and return any files matching "*.theme.php"
+ */
+function _jsumfields_civix_civicrm_themes(&$themes) {
+  $files = _jsumfields_civix_glob(__DIR__ . '/*.theme.php');
+  foreach ($files as $file) {
+    $themeMeta = include $file;
+    if (empty($themeMeta['name'])) {
+      $themeMeta['name'] = preg_replace(':\.theme\.php$:', '', basename($file));
+    }
+    if (empty($themeMeta['ext'])) {
+      $themeMeta['ext'] = E::LONG_NAME;
+    }
+    $themes[$themeMeta['name']] = $themeMeta;
+  }
+}
+
 /**
  * Glob wrapper which is guaranteed to return an array.
  *
@@ -264,29 +363,34 @@ function _jsumfields_civix_civicrm_angularModules(&$angularModules) {
  *
  * @link http://php.net/glob
  * @param string $pattern
- * @return array, possibly empty
+ *
+ * @return array
  */
 function _jsumfields_civix_glob($pattern) {
   $result = glob($pattern);
-  return is_array($result) ? $result : array();
+  return is_array($result) ? $result : [];
 }
 
 /**
  * Inserts a navigation menu item at a given place in the hierarchy.
  *
  * @param array $menu - menu hierarchy
- * @param string $path - path where insertion should happen (ie. Administer/System Settings)
- * @param array $item - menu you need to insert (parent/child attributes will be filled for you)
+ * @param string $path - path to parent of this item, e.g. 'my_extension/submenu'
+ *    'Mailing', or 'Administer/System Settings'
+ * @param array $item - the item to insert (parent/child attributes will be
+ *    filled for you)
+ *
+ * @return bool
  */
 function _jsumfields_civix_insert_navigation_menu(&$menu, $path, $item) {
   // If we are done going down the path, insert menu
   if (empty($path)) {
-    $menu[] = array(
-      'attributes' => array_merge(array(
+    $menu[] = [
+      'attributes' => array_merge([
         'label'      => CRM_Utils_Array::value('name', $item),
         'active'     => 1,
-      ), $item),
-    );
+      ], $item),
+    ];
     return TRUE;
   }
   else {
@@ -297,9 +401,9 @@ function _jsumfields_civix_insert_navigation_menu(&$menu, $path, $item) {
     foreach ($menu as $key => &$entry) {
       if ($entry['attributes']['name'] == $first) {
         if (!isset($entry['child'])) {
-          $entry['child'] = array();
+          $entry['child'] = [];
         }
-        $found = _jsumfields_civix_insert_navigation_menu($entry['child'], implode('/', $path), $item, $key);
+        $found = _jsumfields_civix_insert_navigation_menu($entry['child'], implode('/', $path), $item);
       }
     }
     return $found;
@@ -310,7 +414,7 @@ function _jsumfields_civix_insert_navigation_menu(&$menu, $path, $item) {
  * (Delegated) Implements hook_civicrm_navigationMenu().
  */
 function _jsumfields_civix_navigationMenu(&$nodes) {
-  if (!is_callable(array('CRM_Core_BAO_Navigation', 'fixNavigationMenu'))) {
+  if (!is_callable(['CRM_Core_BAO_Navigation', 'fixNavigationMenu'])) {
     _jsumfields_civix_fixNavigationMenu($nodes);
   }
 }
@@ -352,17 +456,22 @@ function _jsumfields_civix_fixNavigationMenuItems(&$nodes, &$maxNavID, $parentID
 /**
  * (Delegated) Implements hook_civicrm_alterSettingsFolders().
  *
- * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_alterSettingsFolders
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_alterSettingsFolders
  */
 function _jsumfields_civix_civicrm_alterSettingsFolders(&$metaDataFolders = NULL) {
-  static $configured = FALSE;
-  if ($configured) {
-    return;
-  }
-  $configured = TRUE;
-
   $settingsDir = __DIR__ . DIRECTORY_SEPARATOR . 'settings';
-  if (is_dir($settingsDir) && !in_array($settingsDir, $metaDataFolders)) {
+  if (!in_array($settingsDir, $metaDataFolders) && is_dir($settingsDir)) {
     $metaDataFolders[] = $settingsDir;
   }
 }
+
+/**
+ * (Delegated) Implements hook_civicrm_entityTypes().
+ *
+ * Find any *.entityType.php files, merge their content, and return.
+ *
+ * @link https://docs.civicrm.org/dev/en/latest/hooks/hook_civicrm_entityTypes
+ */
+function _jsumfields_civix_civicrm_entityTypes(&$entityTypes) {
+  $entityTypes = array_merge($entityTypes, []);
+}
diff --git a/jsumfields.php b/jsumfields.php
index 5482864..bb6eb8e 100644
--- a/jsumfields.php
+++ b/jsumfields.php
@@ -1,6 +1,7 @@
 <?php
 
 require_once 'jsumfields.civix.php';
+use CRM_Jsumfields_ExtensionUtil as E;
 
 /**
  * Implements hook_civicrm_apiWrappers().
@@ -1875,7 +1876,7 @@ function jsumfields_civicrm_alterSettingsFolders(&$metaDataFolders = NULL) {
  */
 // function jsumfields_civicrm_navigationMenu(&$menu) {
 // _jsumfields_civix_insert_navigation_menu($menu, NULL, array(
-// 'label' => ts('The Page', array('domain' => 'com.joineryhq.jsumfields')),
+// 'label' => E::ts('The Page', array('domain' => 'com.joineryhq.jsumfields')),
 // 'name' => 'the_page',
 // 'url' => 'civicrm/the-page',
 // 'permission' => 'access CiviReport,access CiviContribute',
@@ -1895,7 +1896,7 @@ function jsumfields_ts($text, $params = array()) {
   if (!array_key_exists('domain', $params)) {
     $params['domain'] = 'com.joineryhq.jsumfields';
   }
-  return ts($text, $params);
+  return E::ts($text, $params);
 }
 
 /**
@@ -1969,7 +1970,7 @@ function jsumfields_civicrm_triggerInfo(&$info, $triggerTableName) {
         // If we fail to properly rewrite the sql, don't set the trigger
         // to avoid sql exceptions.
         if (FALSE === $trigger) {
-          $msg = sprintf(ts("Failed to rewrite sql for %s field."), $base_column_name);
+          $msg = sprintf(E::ts("Failed to rewrite sql for %s field."), $base_column_name);
           $session->setStatus($msg);
           continue;
         }
@@ -2150,7 +2151,7 @@ function _jsumfields_generate_data_based_on_current_data($session = NULL) {
     $session = CRM_Core_Session::singleton();
   }
   if (empty($sumfieldsCustomTableName)) {
-    $session::setStatus(ts("Your configuration may be corrupted. Please disable and renable this extension."), ts('Error'), 'error');
+    $session::setStatus(E::ts("Your configuration may be corrupted. Please disable and renable this extension."), E::ts('Error'), 'error');
     return FALSE;
   }
 
@@ -2181,7 +2182,7 @@ function _jsumfields_generate_data_based_on_current_data($session = NULL) {
     $updateQuery = sumfields_sql_rewrite($updateQuery);
 
     if (FALSE === $updateQuery) {
-      $msg = sprintf(ts("Failed to rewrite sql for %s field."), $base_column_name);
+      $msg = sprintf(E::ts("Failed to rewrite sql for %s field."), $base_column_name);
       $session->setStatus($msg);
       continue;
     }