Print in the console report showing amount of tasks used K2

^KT-57736 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/experimental/TryK2IT.kt

@@ -30,6 +30,7 @@ class TryK2IT : KGPBaseTest() {
 
             build("--dry-run") {
                 assertOutputContainsExactTimes(EXPERIMENTAL_TRY_K2_WARNING_MESSAGE, 1)
+                assertOutputContains("No Kotlin compilation tasks have run")
             }
         }
     }
@@ -53,6 +54,78 @@ class TryK2IT : KGPBaseTest() {
         }
     }
 
+    @DisplayName("JVM: build report is not printed")
+    @JvmGradlePluginTests
+    @GradleTest
+    fun buildReportNotPrinted(gradleVersion: GradleVersion) {
+        project(
+            "incrementalMultiproject",
+            gradleVersion,
+            buildOptions = defaultBuildOptions.copy(logLevel = LogLevel.WARN)
+        ) {
+            build("build") {
+                assertOutputDoesNotContain(
+                    "##### 'kotlin.experimental.tryK2' results (Kotlin/Native not checked) #####"
+                )
+            }
+        }
+    }
+
+    @DisplayName("JVM: report is printed at the end of the build")
+    @JvmGradlePluginTests
+    @GradleTest
+    fun buildReport(gradleVersion: GradleVersion) {
+        project(
+            "incrementalMultiproject",
+            gradleVersion,
+            buildOptions = defaultBuildOptions.copy(logLevel = LogLevel.WARN)
+        ) {
+            enableTryK2()
+
+            build("build") {
+                assertOutputContains(
+                    """
+                    |##### 'kotlin.experimental.tryK2' results (Kotlin/Native not checked) #####
+                    |:lib:compileKotlin: 2.0 language version
+                    |:app:compileKotlin: 2.0 language version
+                    |##### 100% (2/2) tasks have compiled with Kotlin 2 #####
+                    """.trimMargin().normalizeLineEndings()
+                )
+            }
+        }
+    }
+
+    @DisplayName("JVM: report is printed at the end of the build in case of compilation error")
+    @JvmGradlePluginTests
+    @GradleTest
+    fun buildReportOnCompilationError(gradleVersion: GradleVersion) {
+        project(
+            "incrementalMultiproject",
+            gradleVersion,
+            buildOptions = defaultBuildOptions.copy(logLevel = LogLevel.WARN)
+        ) {
+            enableTryK2()
+
+            subProject("app").kotlinSourcesDir().resolve("foo/AA.kt").appendText(
+                """
+                |
+                |ZZZZ
+                """.trimMargin()
+            )
+
+            buildAndFail("build", forceOutput = true) {
+                assertOutputContains(
+                    """
+                    |##### 'kotlin.experimental.tryK2' results (Kotlin/Native not checked) #####
+                    |:lib:compileKotlin: 2.0 language version
+                    |:app:compileKotlin: 2.0 language version
+                    |##### 100% (2/2) tasks have compiled with Kotlin 2 #####
+                    """.trimMargin().normalizeLineEndings()
+                )
+            }
+        }
+    }
+
     @DisplayName("MPP: language version default is changed to 2.0")
     @MppGradlePluginTests
     @GradleTest

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/report/BuildReportType.kt

@@ -11,9 +11,11 @@ enum class BuildReportType : Serializable {
     FILE,
     HTTP,
     BUILD_SCAN,
-    SINGLE_FILE;
+    SINGLE_FILE,
+    TRY_K2_CONSOLE,
+    ;
 
     companion object {
-        const val serialVersionUID: Long = 0
+        const val serialVersionUID: Long = 1L
     }
 }

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/report/BuildReportsService.kt

@@ -16,6 +16,7 @@ import org.jetbrains.kotlin.build.report.statistics.BuildFinishStatisticsData
 import org.jetbrains.kotlin.build.report.statistics.CompileStatisticsData
 import org.jetbrains.kotlin.build.report.statistics.BuildStartParameters
 import org.jetbrains.kotlin.build.report.statistics.StatTag
+import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
 import org.jetbrains.kotlin.gradle.report.data.BuildExecutionData
 import org.jetbrains.kotlin.gradle.report.data.BuildOperationRecord
 import org.jetbrains.kotlin.utils.addToStdlib.measureTimeMillisWithResult
@@ -92,6 +93,10 @@ class BuildReportsService {
             MetricsWriter(singleOutputFile.absoluteFile).process(buildData, log)
         }
 
+        if (reportingSettings.experimentalTryK2ConsoleOutput) {
+            reportTryK2ToConsole(buildData)
+        }
+
         //It's expected that bad internet connection can cause a significant delay for big project
         executorService.shutdown()
     }
@@ -227,6 +232,32 @@ class BuildReportsService {
         customValues++
     }
 
+    private fun reportTryK2ToConsole(
+        data: BuildExecutionData
+    ) {
+        val tasksData = data.buildOperationRecord
+            .filterIsInstance<TaskRecord>()
+            .filter {
+                // Filtering by only KGP tasks and by those that actually do compilation
+                it.isFromKotlinPlugin && it.kotlinLanguageVersion != null
+            }
+        log.warn("##### 'kotlin.experimental.tryK2' results (Kotlin/Native not checked) #####")
+        if (tasksData.isEmpty()) {
+            log.warn("No Kotlin compilation tasks have run")
+            log.warn("#####")
+        } else {
+            val tasksCountWithKotlin2 = tasksData.count {
+                it.kotlinLanguageVersion != null && it.kotlinLanguageVersion >= KotlinVersion.KOTLIN_2_0
+            }
+            val taskWithK2Percent = (tasksCountWithKotlin2 * 100) / tasksData.count()
+            val statsData = tasksData.map { it.path to it.kotlinLanguageVersion?.version }
+            statsData.forEach { record ->
+                log.warn("${record.first}: ${record.second} language version")
+            }
+            log.warn("##### $taskWithK2Percent% ($tasksCountWithKotlin2/${tasksData.count()}) tasks have compiled with Kotlin 2 #####")
+        }
+    }
+
     private fun readableString(data: CompileStatisticsData): List<String> {
         val readableString = StringBuilder()
         if (data.nonIncrementalAttributes.isEmpty()) {

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/report/ReportingSettings.kt

@@ -18,6 +18,7 @@ data class ReportingSettings(
     val httpReportSettings: HttpReportSettings? = null,
     val buildScanReportSettings: BuildScanSettings? = null,
     val singleOutputFile: File? = null,
+    val experimentalTryK2ConsoleOutput: Boolean = false,
     val includeCompilerArguments: Boolean = false,
 ) : Serializable {
     companion object {

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/report/configureReporing.kt

@@ -20,10 +20,15 @@ private val availableMetrics = BuildTime.values().map { it.name } + BuildPerform
 
 internal fun reportingSettings(project: Project): ReportingSettings {
     val properties = PropertiesProvider(project)
-    val buildReportOutputTypes = properties.buildReportOutputs.map {
-        BuildReportType.values().firstOrNull { brt -> brt.name == it.trim().toUpperCaseAsciiOnly() }
-            ?: throw IllegalStateException("Unknown output type: $it")
-    }.toMutableList() //temporary solution. support old property
+    val experimentalTryK2Enabled = properties.kotlinExperimentalTryK2.get()
+    val buildReportOutputTypes = properties.buildReportOutputs
+        .map {
+            BuildReportType.values().firstOrNull { brt -> brt.name == it.trim().toUpperCaseAsciiOnly() }
+                ?: throw IllegalStateException("Unknown output type: $it")
+        }
+        .plus(if (experimentalTryK2Enabled) listOf(BuildReportType.TRY_K2_CONSOLE) else emptyList())
+        .toMutableList() //temporary solution. support old property
+
     val buildReportMode =
         when {
             buildReportOutputTypes.isEmpty() -> BuildReportMode.NONE
@@ -82,6 +87,7 @@ internal fun reportingSettings(project: Project): ReportingSettings {
         buildReportOutputs = buildReportOutputTypes,
         singleOutputFile = singleOutputFile ?: oldSingleBuildMetric,
         includeCompilerArguments = properties.buildReportIncludeCompilerArguments,
+        experimentalTryK2ConsoleOutput = experimentalTryK2Enabled
     )
 }