Add extension point for registry keys (IDEA-CR-36577, IDEA-177378)

platform/platform-impl/src/com/intellij/openapi/util/registry/RegistryExtensionCollector.kt

@@ -0,0 +1,27 @@
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.openapi.util.registry
+
+import com.intellij.openapi.extensions.ExtensionPointName
+import com.intellij.util.xmlb.annotations.Attribute
+
+/**
+ * @author yole
+ */
+class RegistryKeyBean {
+  @JvmField @Attribute("key") val key: String = ""
+  @JvmField @Attribute("description") val description: String = ""
+  @JvmField @Attribute("defaultValue") val defaultValue: String = ""
+  @JvmField @Attribute("restartRequired") val restartRequired: Boolean = false
+
+  companion object {
+    val EP_NAME = ExtensionPointName.create<RegistryKeyBean>("com.intellij.registryKey")
+  }
+}
+
+class RegistryExtensionCollector {
+  init {
+    for (extension in RegistryKeyBean.EP_NAME.extensions) {
+      Registry.addKey(extension.key, extension.description, extension.defaultValue, extension.restartRequired)
+    }
+  }
+}

platform/platform-resources/src/META-INF/PlatformExtensionPoints.xml

@@ -323,5 +323,7 @@
                     beanClass="com.intellij.lang.LanguageExtensionPoint">
       <with attribute="implementationClass" implements="com.intellij.injected.editor.InjectedFileChangesHandlerProvider"/>
     </extensionPoint>
+
+    <extensionPoint qualifiedName="com.intellij.registryKey" beanClass="com.intellij.openapi.util.registry.RegistryKeyBean"/>
   </extensionPoints>
 </idea-plugin>

platform/platform-resources/src/componentSets/Platform.xml

@@ -147,6 +147,10 @@
     <component>
       <implementation-class>com.intellij.diagnostic.LowMemoryNotifier</implementation-class>
     </component>
+
+    <component>
+      <implementation-class>com.intellij.openapi.util.registry.RegistryExtensionCollector</implementation-class>
+    </component>
   </application-components>
 
   <project-components>