Fixed inline anonymous function routing

CHANGELOG.md

@@ -1,3 +1,4 @@
+- Added Inline Anonymous Function/Lambda refactoring: place the caret in an immediately invoked Kotlin lambda or anonymous function, press **Ctrl+Alt+N** or choose **Refactor → Inline...**, preview the one-call rewrite, and apply the IntelliJ IDEA K2-generated substitution; **Undo Last Refactoring** restores the original document.
 - Added separate Java and Kotlin package trees in Project Explorer: conventional `src/main/java` and `src/test/java` remain under **Source Packages** and **Test Packages**, while `src/main/kotlin` and `src/test/kotlin` appear under **Kotlin Source Packages** and **Kotlin Test Packages** in Maven, Gradle, and Ant/J2SE projects.
 - Added Inline Type Alias refactoring: place the caret on a Kotlin `typealias` declaration or one of its type uses, press **Ctrl+Alt+N** or choose **Refactor → Inline...**, then expand every supported Kotlin occurrence or only the selected use and optionally retain the alias declaration; generic arguments, imports, and parenthesisation use the IntelliJ IDEA K2 engine, while **Undo Last Refactoring** restores all changed Kotlin files.
 - Added Change Kotlin Package refactoring: use **Refactor → Change Kotlin Package...** for the active Kotlin file or a folder's recursive Kotlin descendants to update package directives in place; nested files retain their relative package hierarchy, supported Kotlin code references and direct imports update, and **Undo Last Refactoring** restores the original contents.

CoreImpl/pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>io.github.nbplugins</groupId>
     <artifactId>netbeans-plugin-kotlin</artifactId>
-    <version>0.11.252-SNAPSHOT</version>
+    <version>0.11.256-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>netbeans-plugin-kotlin-core-impl</artifactId>

KotlinCompilerCliBase/pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>io.github.nbplugins</groupId>
     <artifactId>netbeans-plugin-kotlin</artifactId>
-    <version>0.11.252-SNAPSHOT</version>
+    <version>0.11.256-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>netbeans-plugin-kotlin-compiler-cli-base</artifactId>

KotlinFixesImpl/pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>io.github.nbplugins</groupId>
     <artifactId>netbeans-plugin-kotlin</artifactId>
-    <version>0.11.252-SNAPSHOT</version>
+    <version>0.11.256-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>netbeans-plugin-kotlin-fixes-impl</artifactId>

KotlinFormatter/pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>io.github.nbplugins</groupId>
     <artifactId>netbeans-plugin-kotlin</artifactId>
-    <version>0.11.252-SNAPSHOT</version>
+    <version>0.11.256-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>netbeans-plugin-kotlin-formatter</artifactId>

KotlinHighlighting/pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>io.github.nbplugins</groupId>
     <artifactId>netbeans-plugin-kotlin</artifactId>
-    <version>0.11.252-SNAPSHOT</version>
+    <version>0.11.256-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>netbeans-plugin-kotlin-highlighting</artifactId>

KotlinIcons/pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>io.github.nbplugins</groupId>
     <artifactId>netbeans-plugin-kotlin</artifactId>
-    <version>0.11.252-SNAPSHOT</version>
+    <version>0.11.256-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>netbeans-plugin-kotlin-icons</artifactId>

KotlinIntentionUtils/pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>io.github.nbplugins</groupId>
     <artifactId>netbeans-plugin-kotlin</artifactId>
-    <version>0.11.252-SNAPSHOT</version>
+    <version>0.11.256-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>netbeans-plugin-kotlin-intention-utils</artifactId>

KotlinRefactoring/pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>io.github.nbplugins</groupId>
     <artifactId>netbeans-plugin-kotlin</artifactId>
-    <version>0.11.252-SNAPSHOT</version>
+    <version>0.11.256-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>netbeans-plugin-kotlin-refactoring</artifactId>

KotlinRefactoring/src/main/kotlin/io/github/nbplugins/kotlin/refactoring/KaInlineAnonymousFunctionComputer.kt

@@ -0,0 +1,93 @@
+/*******************************************************************************
+ * Copyright 2000-2024 JetBrains s.r.o.
+ * Copyright 2026 nbplugins contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *******************************************************************************/
+package io.github.nbplugins.kotlin.refactoring
+
+import com.intellij.psi.util.PsiTreeUtil
+import org.jetbrains.kotlin.idea.k2.refactoring.inline.KotlinInlineAnonymousFunctionProcessor
+import org.jetbrains.kotlin.psi.KtExpression
+import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.kotlin.psi.KtFunction
+import org.jetbrains.kotlin.psi.KtFunctionLiteral
+import org.jetbrains.kotlin.psi.KtNamedFunction
+
+/**
+ * Prepared IDEA-engine data for a Kotlin **Inline Anonymous Function** refactoring.
+ *
+ * @param function lambda or anonymous function selected at the invocation caret
+ * @param call immediate invocation accepted by IDEA's anonymous-function processor
+ */
+data class KaInlineAnonymousFunctionResult(
+    val function: KtFunction,
+    val call: KtExpression,
+)
+
+/**
+ * Prepares an immediately invoked lambda or anonymous function for IDEA's K2 inline processor.
+ *
+ * IDEA remains responsible for recognising supported invocation shapes through
+ * [KotlinInlineAnonymousFunctionProcessor.findCallExpression]. The NetBeans adapter owns UI,
+ * preview, document persistence, and undo.
+ *
+ * @param cursorKtFile session-managed Kotlin file containing the invocation caret
+ * @param offset caret offset within [cursorKtFile]
+ */
+class KaInlineAnonymousFunctionComputer(
+    private val cursorKtFile: KtFile,
+    private val offset: Int,
+) {
+
+    /** Result of [compute]. */
+    sealed class Outcome {
+        /** The lambda/anonymous function and its IDEA-supported immediate call are ready. */
+        data class Ready(val result: KaInlineAnonymousFunctionResult) : Outcome()
+
+        /** A lambda/anonymous function was selected but is not immediately invoked. */
+        data class Error(val message: String) : Outcome()
+
+        /** The caret does not select a lambda or anonymous function. */
+        data object NotApplicable : Outcome()
+    }
+
+    /**
+     * Finds the lambda or anonymous function enclosing the caret and delegates call validation to IDEA.
+     *
+     * @return [Outcome.Ready] for an immediately invoked function, [Outcome.Error] for an uninvoked
+     *         lambda/anonymous function, or [Outcome.NotApplicable] for all other caret targets
+     */
+    fun compute(): Outcome {
+        val element = cursorKtFile.findElementAt(offset) ?: return Outcome.NotApplicable
+        val function = PsiTreeUtil.getParentOfType(element, KtFunction::class.java, false)
+            ?.takeIf(::isAnonymousFunction)
+            ?: return Outcome.NotApplicable
+        val call = KotlinInlineAnonymousFunctionProcessor.findCallExpression(function)
+            ?: return Outcome.Error(messageFor(function))
+        return Outcome.Ready(KaInlineAnonymousFunctionResult(function, call))
+    }
+
+    /** Restricts this route to function literals and unnamed `fun` expressions, not named declarations. */
+    private fun isAnonymousFunction(function: KtFunction): Boolean =
+        function is KtFunctionLiteral || function is KtNamedFunction && function.nameIdentifier == null
+
+    /** Explains the IDEA eligibility restriction without importing IDEA's modal error UI. */
+    private fun messageFor(function: KtFunction): String =
+        if (function is KtFunctionLiteral) {
+            "Cannot inline this lambda expression because it is not immediately invoked."
+        } else {
+            "Cannot inline this anonymous function because it is not immediately invoked."
+        }
+}

Nbm/pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>io.github.nbplugins</groupId>
     <artifactId>netbeans-plugin-kotlin</artifactId>
-    <version>0.11.252-SNAPSHOT</version>
+    <version>0.11.256-SNAPSHOT</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>netbeans-plugin-kotlin-nbm</artifactId>

Nbm/src/main/java/io/github/nbplugins/kotlin/nbm/refactoring/KotlinInlineAnonymousFunctionUI.java

@@ -0,0 +1,112 @@
+/*******************************************************************************
+ * Copyright 2026 nbplugins contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *******************************************************************************/
+package io.github.nbplugins.kotlin.nbm.refactoring;
+
+import java.awt.BorderLayout;
+import java.awt.Component;
+import javax.swing.BorderFactory;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.event.ChangeListener;
+import org.netbeans.modules.refactoring.api.AbstractRefactoring;
+import org.netbeans.modules.refactoring.api.Problem;
+import org.netbeans.modules.refactoring.spi.ui.CustomRefactoringPanel;
+import org.netbeans.modules.refactoring.spi.ui.RefactoringUI;
+import org.openide.util.HelpCtx;
+
+/**
+ * NetBeans UI adapter for Kotlin **Inline Anonymous Function**.
+ *
+ * The transformation is limited to the immediately invoked lambda or anonymous function selected
+ * at the caret. IDEA's K2 processor supplies the actual rewrite; NetBeans supplies its preview
+ * and confirmation flow.
+ *
+ * @param refactoring carrier routed to {@link KotlinInlineAnonymousFunctionPlugin}
+ */
+public final class KotlinInlineAnonymousFunctionUI implements RefactoringUI {
+
+    private final KotlinInlineAnonymousFunctionRefactoring refactoring;
+
+    /**
+     * Creates an Inline Anonymous Function UI.
+     *
+     * @param refactoring carrier receiving the active document and caret
+     */
+    public KotlinInlineAnonymousFunctionUI(KotlinInlineAnonymousFunctionRefactoring refactoring) {
+        this.refactoring = refactoring;
+    }
+
+    @Override
+    public String getName() {
+        return "Inline Anonymous Function";
+    }
+
+    @Override
+    public String getDescription() {
+        return "Inline immediately invoked lambda or anonymous function";
+    }
+
+    @Override
+    public boolean isQuery() {
+        return false;
+    }
+
+    @Override
+    public CustomRefactoringPanel getPanel(ChangeListener parent) {
+        return new DescriptionPanel(getDescription());
+    }
+
+    @Override
+    public Problem setParameters() {
+        return null;
+    }
+
+    @Override
+    public Problem checkParameters() {
+        return null;
+    }
+
+    @Override
+    public boolean hasParameters() {
+        return true;
+    }
+
+    @Override
+    public AbstractRefactoring getRefactoring() {
+        return refactoring;
+    }
+
+    @Override
+    public HelpCtx getHelpCtx() {
+        return null;
+    }
+
+    /** Displays the operation description until the user previews or confirms the refactoring. */
+    private static final class DescriptionPanel implements CustomRefactoringPanel {
+        private final JPanel component;
+
+        DescriptionPanel(String description) {
+            JLabel label = new JLabel(description);
+            label.setBorder(BorderFactory.createEmptyBorder(8, 12, 8, 12));
+            component = new JPanel(new BorderLayout());
+            component.add(label, BorderLayout.CENTER);
+        }
+
+        @Override public void initialize() {}
+        @Override public Component getComponent() { return component; }
+    }
+}

Nbm/src/main/java/org/jetbrains/kotlin/refactorings/rename/KotlinRefactoringsFactory.java

@@ -34,6 +34,8 @@
 import io.github.nbplugins.kotlin.nbm.refactoring.KotlinInlineVariableRefactoring;
 import io.github.nbplugins.kotlin.nbm.refactoring.KotlinInlineTypeAliasPlugin;
 import io.github.nbplugins.kotlin.nbm.refactoring.KotlinInlineTypeAliasRefactoring;
+import io.github.nbplugins.kotlin.nbm.refactoring.KotlinInlineAnonymousFunctionPlugin;
+import io.github.nbplugins.kotlin.nbm.refactoring.KotlinInlineAnonymousFunctionRefactoring;
 import io.github.nbplugins.kotlin.nbm.refactoring.KotlinIntroduceConstantPlugin;
 import io.github.nbplugins.kotlin.nbm.refactoring.KotlinIntroduceConstantRefactoring;
 import io.github.nbplugins.kotlin.nbm.refactoring.KotlinCopyDeclarationPlugin;
@@ -86,6 +88,7 @@
  *   <li>{@link KotlinInlineVariableRefactoring} — delegates to {@link KotlinInlineVariablePlugin}</li>
  *   <li>{@link KotlinInlineFunctionRefactoring} — delegates to {@link KotlinInlineFunctionPlugin}</li>
  *   <li>{@link KotlinInlineTypeAliasRefactoring} — delegates to {@link KotlinInlineTypeAliasPlugin}</li>
+ *   <li>{@link KotlinInlineAnonymousFunctionRefactoring} — delegates to {@link KotlinInlineAnonymousFunctionPlugin}</li>
  *   <li>{@link KotlinIntroduceVariableRefactoring} — delegates to {@link KotlinIntroduceVariablePlugin}</li>
  *   <li>{@link KotlinExtractFunctionRefactoring} — delegates to {@link KotlinExtractFunctionPlugin}</li>
  *   <li>{@link KotlinIntroduceConstantRefactoring} — delegates to {@link KotlinIntroduceConstantPlugin}</li>
@@ -138,6 +141,9 @@ public RefactoringPlugin createInstance(AbstractRefactoring refactoring) {
         if (refactoring instanceof KotlinInlineTypeAliasRefactoring) {
             return new KotlinInlineTypeAliasPlugin((KotlinInlineTypeAliasRefactoring) refactoring);
         }
+        if (refactoring instanceof KotlinInlineAnonymousFunctionRefactoring) {
+            return new KotlinInlineAnonymousFunctionPlugin((KotlinInlineAnonymousFunctionRefactoring) refactoring);
+        }
         if (refactoring instanceof KotlinIntroduceVariableRefactoring) {
             return new KotlinIntroduceVariablePlugin((KotlinIntroduceVariableRefactoring) refactoring);
         }