Scripting: avoid definitions discovery when compiling regular kotlin

If only regular kotlin .kt (and .java) files are compiled, do not
register file extensions that may come from discovered script
definitions. Since the discovery is lazy by itself, this should
skip jars processing for regular compilation scenarios without scripts.
#KT-47816 fixed

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/coreEnvironmentUtils.kt

@@ -5,6 +5,8 @@
 
 package org.jetbrains.kotlin.cli.jvm.compiler
 
+import com.intellij.ide.highlighter.JavaClassFileType
+import com.intellij.ide.highlighter.JavaFileType
 import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.vfs.StandardFileSystems
@@ -19,9 +21,11 @@ import org.jetbrains.kotlin.cli.common.messages.MessageCollector
 import org.jetbrains.kotlin.config.CompilerConfiguration
 import org.jetbrains.kotlin.config.CompilerConfigurationKey
 import org.jetbrains.kotlin.config.JVMConfigurationKeys
+import org.jetbrains.kotlin.extensions.CompilerConfigurationExtension
 import org.jetbrains.kotlin.extensions.PreprocessedFileCreator
 import org.jetbrains.kotlin.idea.KotlinFileType
 import org.jetbrains.kotlin.modules.Module
+import org.jetbrains.kotlin.parsing.KotlinParserDefinition
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.resolve.multiplatform.isCommonSource
 import java.io.File
@@ -43,6 +47,8 @@ inline fun List<KotlinSourceRoot>.forAllFiles(
 
     val virtualFileCreator = PreprocessedFileCreator(project)
 
+    var pluginsConfigured = false
+
     for ((sourceRootPath, isCommon) in this) {
         val sourceRoot = File(sourceRootPath)
         val vFile = localFileSystem.findFileByPath(sourceRoot.normalize().path)
@@ -59,9 +65,15 @@ inline fun List<KotlinSourceRoot>.forAllFiles(
             continue
         }
 
-        if (!vFile.isDirectory && vFile.extension != KotlinFileType.EXTENSION && vFile.fileType != KotlinFileType.INSTANCE) {
-            configuration.report(CompilerMessageSeverity.ERROR, "Source entry is not a Kotlin file: $sourceRootPath", reportLocation)
-            continue
+        if (!vFile.isDirectory && vFile.extension != KotlinFileType.EXTENSION) {
+            if (!pluginsConfigured) {
+                vFile.registerPluginsSuppliedExtensionsIfNeeded(project)
+                pluginsConfigured = true
+            }
+            if (vFile.fileType != KotlinFileType.INSTANCE) {
+                configuration.report(CompilerMessageSeverity.ERROR, "Source entry is not a Kotlin file: $sourceRootPath", reportLocation)
+                continue
+            }
         }
 
         for (file in sourceRoot.walkTopDown()) {
@@ -69,12 +81,29 @@ inline fun List<KotlinSourceRoot>.forAllFiles(
 
             val virtualFile = localFileSystem.findFileByPath(file.absoluteFile.normalize().path)?.let(virtualFileCreator::create)
             if (virtualFile != null && processedFiles.add(virtualFile)) {
+                if (!pluginsConfigured) {
+                    virtualFile.registerPluginsSuppliedExtensionsIfNeeded(project)
+                    pluginsConfigured = true
+                }
                 body(virtualFile, isCommon)
             }
         }
     }
 }
 
+fun VirtualFile.registerPluginsSuppliedExtensionsIfNeeded(project: Project) {
+    if (
+        extension == null ||
+        extension == KotlinFileType.EXTENSION ||
+        extension == JavaFileType.INSTANCE.defaultExtension ||
+        extension == JavaClassFileType.INSTANCE.defaultExtension ||
+        fileType == KotlinFileType.INSTANCE
+    ) return
+    for (extension in CompilerConfigurationExtension.getInstances(project)) {
+        extension.updateFileRegistry()
+    }
+}
+
 fun createSourceFilesFromSourceRoots(
     configuration: CompilerConfiguration,
     project: Project,

compiler/frontend/src/org/jetbrains/kotlin/extensions/CompilerConfigurationExtension.kt

@@ -15,4 +15,6 @@ interface CompilerConfigurationExtension {
     )
 
     fun updateConfiguration(configuration: CompilerConfiguration)
+
+    fun updateFileRegistry() {}
 }

compiler/testData/integration/ant/js/verbose/build.log.expected

@@ -5,7 +5,6 @@ build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
 [kotlin2js] logging: using Kotlin home directory [KotlinProjectHome]/dist/kotlinc
 [kotlin2js] logging: exception on loading scripting plugin: java.lang.ClassNotFoundException: org.jetbrains.kotlin.scripting.compiler.plugin.ScriptingCompilerConfigurationComponentRegistrar
-[kotlin2js] logging: configure scripting: Added template org.jetbrains.kotlin.mainKts.MainKtsScript from [[CompilerLib]/kotlin-main-kts.jar, [CompilerLib]/kotlin-reflect.jar, [CompilerLib]/kotlin-script-runtime.jar, [CompilerLib]/kotlin-stdlib.jar]
 [kotlin2js] logging: compiling source files: [TestData]/root1/foo.kt
 
 BUILD SUCCESSFUL

compiler/testData/integration/ant/jvm/verbose/build.log.expected

@@ -7,7 +7,6 @@ build:
   [kotlinc] logging: exception on loading scripting plugin: java.lang.ClassNotFoundException: org.jetbrains.kotlin.scripting.compiler.plugin.ScriptingCompilerConfigurationComponentRegistrar
   [kotlinc] logging: using JVM IR backend
   [kotlinc] logging: configuring the compilation environment
-  [kotlinc] logging: configure scripting: Added template org.jetbrains.kotlin.mainKts.MainKtsScript from [[CompilerLib]/kotlin-main-kts.jar, [CompilerLib]/kotlin-reflect.jar, [CompilerLib]/kotlin-script-runtime.jar, [CompilerLib]/kotlin-stdlib.jar]
 
 BUILD SUCCESSFUL
 Total time: [time]