Rebuild Civix code for PHP 8.0 compatibility (Civix version 22.05.2)

info.xml

@@ -14,14 +14,19 @@
     <url desc="Support">https://github.com/systopia/de.systopia.moregreetings/issues</url>
     <url desc="Licensing">http://www.gnu.org/licenses/agpl-3.0.html</url>
   </urls>
-  <releaseDate></releaseDate>
+  <releaseDate/>
   <version>1.1-dev</version>
   <develStage>dev</develStage>
   <compatibility>
     <ver>5.0</ver>
   </compatibility>
-  <comments></comments>
+  <comments/>
   <civix>
     <namespace>CRM/Moregreetings</namespace>
+    <format>22.05.2</format>
   </civix>
+  <mixins>
+    <mixin>menu-xml@1.0.0</mixin>
+    <mixin>setting-php@1.0.0</mixin>
+  </mixins>
 </extension>

mixin/menu-xml@1.0.0.mixin.php

@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * Auto-register "xml/Menu/*.xml" files.
+ *
+ * @mixinName menu-xml
+ * @mixinVersion 1.0.0
+ *
+ * @param CRM_Extension_MixInfo $mixInfo
+ *   On newer deployments, this will be an instance of MixInfo. On older deployments, Civix may polyfill with a work-a-like.
+ * @param \CRM_Extension_BootCache $bootCache
+ *   On newer deployments, this will be an instance of MixInfo. On older deployments, Civix may polyfill with a work-a-like.
+ */
+return function ($mixInfo, $bootCache) {
+
+  /**
+   * @param \Civi\Core\Event\GenericHookEvent $e
+   * @see CRM_Utils_Hook::xmlMenu()
+   */
+  Civi::dispatcher()->addListener('hook_civicrm_xmlMenu', function ($e) use ($mixInfo) {
+    if (!$mixInfo->isActive()) {
+      return;
+    }
+
+    $files = (array) glob($mixInfo->getPath('xml/Menu/*.xml'));
+    foreach ($files as $file) {
+      $e->files[] = $file;
+    }
+  });
+
+};

mixin/polyfill.php

@@ -0,0 +1,101 @@
+<?php
+
+/**
+ * When deploying on systems that lack mixin support, fake it.
+ *
+ * @mixinFile polyfill.php
+ *
+ * This polyfill does some (persnickity) deduplication, but it doesn't allow upgrades or shipping replacements in core.
+ *
+ * Note: The polyfill.php is designed to be copied into extensions for interoperability. Consequently, this file is
+ * not used 'live' by `civicrm-core`. However, the file does need a canonical home, and it's convenient to keep it
+ * adjacent to the actual mixin files.
+ *
+ * @param string $longName
+ * @param string $shortName
+ * @param string $basePath
+ */
+return function ($longName, $shortName, $basePath) {
+  // Construct imitations of the mixin services. These cannot work as well (e.g. with respect to
+  // number of file-reads, deduping, upgrading)... but they should be OK for a few months while
+  // the mixin services become available.
+
+  // List of active mixins; deduped by version
+  $mixinVers = [];
+  foreach ((array) glob($basePath . '/mixin/*.mixin.php') as $f) {
+    [$name, $ver] = explode('@', substr(basename($f), 0, -10));
+    if (!isset($mixinVers[$name]) || version_compare($ver, $mixinVers[$name], '>')) {
+      $mixinVers[$name] = $ver;
+    }
+  }
+  $mixins = [];
+  foreach ($mixinVers as $name => $ver) {
+    $mixins[] = "$name@$ver";
+  }
+
+  // Imitate CRM_Extension_MixInfo.
+  $mixInfo = new class() {
+
+    /**
+     * @var string
+     */
+    public $longName;
+
+    /**
+     * @var string
+     */
+    public $shortName;
+
+    public $_basePath;
+
+    public function getPath($file = NULL) {
+      return $this->_basePath . ($file === NULL ? '' : (DIRECTORY_SEPARATOR . $file));
+    }
+
+    public function isActive() {
+      return \CRM_Extension_System::singleton()->getMapper()->isActiveModule($this->shortName);
+    }
+
+  };
+  $mixInfo->longName = $longName;
+  $mixInfo->shortName = $shortName;
+  $mixInfo->_basePath = $basePath;
+
+  // Imitate CRM_Extension_BootCache.
+  $bootCache = new class() {
+
+    public function define($name, $callback) {
+      $envId = \CRM_Core_Config_Runtime::getId();
+      $oldExtCachePath = \Civi::paths()->getPath("[civicrm.compile]/CachedExtLoader.{$envId}.php");
+      $stat = stat($oldExtCachePath);
+      $file = Civi::paths()->getPath('[civicrm.compile]/CachedMixin.' . md5($name . ($stat['mtime'] ?? 0)) . '.php');
+      if (file_exists($file)) {
+        return include $file;
+      }
+      else {
+        $data = $callback();
+        file_put_contents($file, '<' . "?php\nreturn " . var_export($data, 1) . ';');
+        return $data;
+      }
+    }
+
+  };
+
+  // Imitate CRM_Extension_MixinLoader::run()
+  // Parse all live mixins before trying to scan any classes.
+  global $_CIVIX_MIXIN_POLYFILL;
+  foreach ($mixins as $mixin) {
+    // If the exact same mixin is defined by multiple exts, just use the first one.
+    if (!isset($_CIVIX_MIXIN_POLYFILL[$mixin])) {
+      $_CIVIX_MIXIN_POLYFILL[$mixin] = include_once $basePath . '/mixin/' . $mixin . '.mixin.php';
+    }
+  }
+  foreach ($mixins as $mixin) {
+    // If there's trickery about installs/uninstalls/resets, then we may need to register a second time.
+    if (!isset(\Civi::$statics[__FUNCTION__][$mixin])) {
+      \Civi::$statics[__FUNCTION__][$mixin] = 1;
+      $func = $_CIVIX_MIXIN_POLYFILL[$mixin];
+      $func($mixInfo, $bootCache);
+    }
+  }
+};

mixin/setting-php@1.0.0.mixin.php

@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Auto-register "settings/*.setting.php" files.
+ *
+ * @mixinName setting-php
+ * @mixinVersion 1.0.0
+ *
+ * @param CRM_Extension_MixInfo $mixInfo
+ *   On newer deployments, this will be an instance of MixInfo. On older deployments, Civix may polyfill with a work-a-like.
+ * @param \CRM_Extension_BootCache $bootCache
+ *   On newer deployments, this will be an instance of MixInfo. On older deployments, Civix may polyfill with a work-a-like.
+ */
+return function ($mixInfo, $bootCache) {
+
+  /**
+   * @param \Civi\Core\Event\GenericHookEvent $e
+   * @see CRM_Utils_Hook::alterSettingsFolders()
+   */
+  Civi::dispatcher()->addListener('hook_civicrm_alterSettingsFolders', function ($e) use ($mixInfo) {
+    // When deactivating on a polyfill/pre-mixin system, listeners may not cleanup automatically.
+    if (!$mixInfo->isActive()) {
+      return;
+    }
+
+    $settingsDir = $mixInfo->getPath('settings');
+    if (!in_array($settingsDir, $e->settingsFolders) && is_dir($settingsDir)) {
+      $e->settingsFolders[] = $settingsDir;
+    }
+  });
+
+};