[kotlin] prohibit kotlin scratches creation

^KTIJ-32088 Fixed


(cherry picked from commit eafbbe789be89b4787ab284e11c5011064dd3fae)

KT-MR-18854

GitOrigin-RevId: a04d8c5f0bb3b4d9e4b2317e2ecb804cad355eba

platform/lang-impl/api-dump-unreviewed.txt

@@ -11364,6 +11364,7 @@ a:com.intellij.ide.scratch.LRUPopupBuilder
 - withExtraMiddleValue(java.lang.Object,java.lang.String,javax.swing.Icon):com.intellij.ide.scratch.LRUPopupBuilder
 - withExtraSpeedSearchNamer(java.util.function.Function):com.intellij.ide.scratch.LRUPopupBuilder
 - withExtraTopValue(java.lang.Object,java.lang.String,javax.swing.Icon):com.intellij.ide.scratch.LRUPopupBuilder
+- withFilter(java.util.function.Predicate):com.intellij.ide.scratch.LRUPopupBuilder
 - withSelection(java.lang.Object):com.intellij.ide.scratch.LRUPopupBuilder
 f:com.intellij.ide.scratch.ScratchFileActions
 - <init>():V
@@ -11383,6 +11384,7 @@ a:com.intellij.ide.scratch.ScratchFileCreationHelper
 - sf:EXTENSION:com.intellij.lang.LanguageExtension
 - <init>():V
 - beforeCreate(com.intellij.openapi.project.Project,com.intellij.ide.scratch.ScratchFileCreationHelper$Context):V
+- newScratchAllowed():Z
 - s:parseHeader(com.intellij.openapi.project.Project,com.intellij.lang.Language,java.lang.String):com.intellij.psi.PsiFile
 - prepareText(com.intellij.openapi.project.Project,com.intellij.ide.scratch.ScratchFileCreationHelper$Context,com.intellij.openapi.actionSystem.DataContext):Z
 - s:reformat(com.intellij.openapi.project.Project,com.intellij.lang.Language,java.lang.String):java.lang.String

platform/lang-impl/src/com/intellij/ide/scratch/LRUPopupBuilder.java

@@ -26,6 +26,7 @@ import java.awt.*;
 import java.util.List;
 import java.util.*;
 import java.util.function.Function;
+import java.util.function.Predicate;
 
 /**
  * @author gregsh
@@ -41,6 +42,7 @@ public abstract class LRUPopupBuilder<T> {
   private T mySelection;
   private Consumer<? super T> myOnChosen;
   private Comparator<? super T> myComparator;
+  private Predicate<? super T> myFilter = it -> true;
   private Iterable<? extends T> myValues;
   private JBIterable<T> myTopValues = JBIterable.empty();
   private JBIterable<T> myMiddleValues = JBIterable.empty();
@@ -129,6 +131,11 @@ public abstract class LRUPopupBuilder<T> {
     return this;
   }
 
+  public @NotNull LRUPopupBuilder<T> withFilter(@Nullable Predicate<? super T> filter) {
+    myFilter = filter;
+    return this;
+  }
+
   public @NotNull LRUPopupBuilder<T> withExtraSpeedSearchNamer(@Nullable Function<? super T, String> function) {
     myExtraSpeedSearchNamer = function;
     return this;
@@ -153,7 +160,7 @@ public abstract class LRUPopupBuilder<T> {
     if (!lru.isEmpty()) {
       lru.sort(Comparator.comparingInt(o -> ids.indexOf(getStorageId(o))));
     }
-    List<T> combinedItems = ContainerUtil.concat(topItems, lru, middleItems, items, bottomItems);
+    List<T> combinedItems = ContainerUtil.concat(topItems, lru, middleItems, items, bottomItems).stream().filter(myFilter).toList();
     T sep1 = ContainerUtil.getOrElse(combinedItems, topItems.size() + lru.size() + middleItems.size(), null);
     T sep2 = ContainerUtil.getOrElse(combinedItems, topItems.size() + lru.size() + middleItems.size() + items.size(), null);
 

platform/lang-impl/src/com/intellij/ide/scratch/ScratchFileCreationHelper.java

@@ -34,6 +34,13 @@ public abstract class ScratchFileCreationHelper {
     return false;
   }
 
+  /**
+   * Return false if it's prohibited to create new scratch file for particular {@link Context#language}
+   */
+  public boolean newScratchAllowed() {
+    return true;
+  }
+  
   public void beforeCreate(@NotNull Project project, @NotNull Context context) {
   } 
   

platform/lang-impl/src/com/intellij/ide/scratch/ScratchImplUtil.java

@@ -256,6 +256,7 @@ final class ScratchImplUtil {
       }
     }
       .forValues(items)
+      .withFilter(it -> it.language == null || ScratchFileCreationHelper.EXTENSION.forLanguage(it.language).newScratchAllowed())
       .withComparator(comparator)
       .withExtraSpeedSearchNamer(o -> o.fileExtension)
       .withSelection(null);

plugins/kotlin/jvm/src/org/jetbrains/kotlin/idea/scratch/KtScratchFileCreationHelper.kt

@@ -5,6 +5,7 @@ package org.jetbrains.kotlin.idea.scratch
 import com.intellij.ide.scratch.ScratchFileCreationHelper
 import com.intellij.openapi.actionSystem.DataContext
 import com.intellij.openapi.project.Project
+import org.jetbrains.kotlin.idea.base.plugin.KotlinPluginModeProvider
 import org.jetbrains.kotlin.idea.statistics.KotlinCreateFileFUSCollector
 import org.jetbrains.kotlin.parsing.KotlinParserDefinition
 
@@ -16,4 +17,11 @@ class KtScratchFileCreationHelper : ScratchFileCreationHelper() {
 
         return super.prepareText(project, context, dataContext)
     }
+
+    override fun newScratchAllowed(): Boolean =
+        if (KotlinPluginModeProvider.isK2Mode()) {
+            false
+        } else {
+            super.newScratchAllowed()
+        }
 }

plugins/kotlin/plugin/k2/resources/kotlin.plugin.k2.xml

@@ -61,6 +61,8 @@
     <projectService serviceInterface="org.jetbrains.kotlin.analysis.api.platform.projectStructure.KotlinCompilerPluginsProvider"
                     serviceImplementation="org.jetbrains.kotlin.idea.fir.extensions.KtCompilerPluginsProviderIdeImpl"/>
     <compilableFileTypesProvider implementation="org.jetbrains.kotlin.idea.compiler.KotlinCompilableFileTypesProvider" />
+    <scratch.creationHelper language="kotlin"
+                            implementationClass="org.jetbrains.kotlin.idea.scratch.KtScratchFileCreationHelper"/>
     <!-- fir-specific -->
     <applicationService serviceInterface="org.jetbrains.kotlin.idea.base.plugin.KotlinPluginModeProvider"
                         serviceImplementation="org.jetbrains.kotlin.idea.fir.plugin.K2KotlinPluginModeProvider"/>