[6.0] Move CMS Filesystem package to compat plugin

administrator/language/en-GB/plg_behaviour_compat.ini

@@ -8,6 +8,8 @@ PLG_COMPAT_FIELD_CLASSES_ALIASES_LABEL="Classes Aliases"
 PLG_COMPAT_FIELD_CLASSES_ALIASES_DESCRIPTION="Add class aliases for classes which have been renamed or moved to a namespace."
 PLG_COMPAT_FIELD_ES5_ASSETS_DESCRIPTION="Activate this option if your extension requires *.es5 assets which has resulted in an exception. The assets provided are empty but prevent the exception."
 PLG_COMPAT_FIELD_ES5_ASSETS_LABEL="ES5 Assets"
+PLG_COMPAT_FIELD_LEGACY_CLASSES_DESCRIPTION="Activate this option if your extension requires classes deprecated for the current version of Joomla. This includes those removed classes from the folder /plugins/behavior/compat/classes/."
+PLG_COMPAT_FIELD_LEGACY_CLASSES_LABEL="Include Deprecated Classes"
 PLG_COMPAT_FIELD_REMOVED_ASSETS_DESCRIPTION="Activate this option if your extension requires removed assets which has resulted in an exception. The assets provided are empty but prevent the exception."
 PLG_COMPAT_FIELD_REMOVED_ASSETS_LABEL="Removed Assets"
 PLG_COMPAT_XML_DESCRIPTION="If you use extensions which are not using the current Joomla Coding standards then this plugin, when enabled, will provide backward compatibility to the prior major version."

plugins/behaviour/compat/compat.xml

@@ -33,6 +33,18 @@
 					<option value="0">JNO</option>
 					<option value="1">JYES</option>
 				</field>
+				<field
+					name="legacy_classes"
+					type="radio"
+					layout="joomla.form.field.radio.switcher"
+					label="PLG_COMPAT_FIELD_LEGACY_CLASSES_LABEL"
+					description="PLG_COMPAT_FIELD_LEGACY_CLASSES_DESCRIPTION"
+					default="1"
+					filter="integer"
+					>
+					<option value="0">JNO</option>
+					<option value="1">JYES</option>
+				</field>
 				<field
 					name="es5_assets"
 					type="radio"

plugins/behaviour/compat/src/Extension/Compat.php

@@ -75,6 +75,13 @@ public function __construct(DispatcherInterface $dispatcher, array $config = [])
             require_once \dirname(__DIR__) . '/classmap/classmap.php';
         }
 
+        /**
+         * Include classes which are removed in 7.0
+         */
+        if ($this->params->get('legacy_classes', '1')) {
+            \JLoader::registerNamespace('\\Joomla\\CMS\\Filesystem', JPATH_PLUGINS . '/behaviour/compat/classes/Filesystem');
+        }
+
         /**
          * Load the constant early as it is used in class files before the class itself is loaded.
          * @deprecated 4.4.0 will be removed in 7.0

ruleset.xml

@@ -9,6 +9,7 @@
     <exclude-pattern type="relative">^cache/*</exclude-pattern>
     <exclude-pattern type="relative">^media/*</exclude-pattern>
     <exclude-pattern type="relative">^node_modules/*</exclude-pattern>
+    <exclude-pattern type="relative">^plugins/behaviour/compat/classes/*</exclude-pattern>
     <exclude-pattern type="relative">^tmp/*</exclude-pattern>
 
     <!-- Exclude 3rd party libraries and Framework code. -->
@@ -131,8 +132,6 @@
         <exclude-pattern type="relative">administrator/components/com_users/src/Service/HTML/Users\.php</exclude-pattern>
         <exclude-pattern type="relative">components/com_content/helpers/icon\.php</exclude-pattern>
         <exclude-pattern type="relative">components/com_content/helpers/icon\.php</exclude-pattern>
-        <exclude-pattern type="relative">libraries/src/Filesystem/Stream\.php</exclude-pattern>
-        <exclude-pattern type="relative">libraries/src/Filesystem/Streams/StreamString\.php</exclude-pattern>
         <exclude-pattern type="relative">libraries/src/Installer/Adapter/ComponentAdapter\.php</exclude-pattern>
         <exclude-pattern type="relative">libraries/src/Installer/Adapter/LanguageAdapter\.php</exclude-pattern>
         <exclude-pattern type="relative">libraries/src/Installer/Adapter/ModuleAdapter\.php</exclude-pattern>
@@ -204,9 +203,6 @@
         <exclude-pattern type="relative">libraries/src/Encrypt/Base32\.php</exclude-pattern>
         <exclude-pattern type="relative">libraries/src/Environment/Browser\.php</exclude-pattern>
         <exclude-pattern type="relative">libraries/src/Feed/FeedFactory\.php</exclude-pattern>
-        <exclude-pattern type="relative">libraries/src/Filesystem/Folder\.php</exclude-pattern>
-        <exclude-pattern type="relative">libraries/src/Filesystem/Stream\.php</exclude-pattern>
-        <exclude-pattern type="relative">libraries/src/Filesystem/Support/StringController\.php</exclude-pattern>
         <exclude-pattern type="relative">libraries/src/HTML/Helpers/Grid\.php</exclude-pattern>
         <exclude-pattern type="relative">libraries/src/Installer/Adapter/ComponentAdapter\.php</exclude-pattern>
         <exclude-pattern type="relative">libraries/src/Installer/Adapter/LanguageAdapter\.php</exclude-pattern>
@@ -246,8 +242,6 @@
         <!-- should be reconsidered -->
         <exclude-pattern type="relative">administrator/components/com_installer/src/Model/DatabaseModel\.php</exclude-pattern>
         <exclude-pattern type="relative">libraries/src/Client/FtpClient\.php</exclude-pattern>
-        <exclude-pattern type="relative">libraries/src/Filesystem/Path\.php</exclude-pattern>
-        <exclude-pattern type="relative">libraries/src/Filesystem/Streams/StreamString\.php</exclude-pattern>
 
         <!-- expected, may move exception to file or refactor implementation -->
         <exclude-pattern type="relative">index\.php</exclude-pattern>