Fixed support of KSP plugin

The compiler output reading was removed at the Gradle configuration stage, which caused the ConcurrentModificationException, because after reading the directories with Kover, they were modified by KSP

Fixes #766
PR #767

Author: shanshin

kover-gradle-plugin/src/functionalTest/kotlin/kotlinx/kover/gradle/plugin/test/functional/cases/AndroidKspTests.kt

@@ -0,0 +1,11 @@
+package kotlinx.kover.gradle.plugin.test.functional.cases
+
+import kotlinx.kover.gradle.plugin.test.functional.framework.checker.CheckerContext
+import kotlinx.kover.gradle.plugin.test.functional.framework.starter.TemplateTest
+
+internal class AndroidKspTests {
+    @TemplateTest("android-ksp", ["koverXmlReport"])
+    fun CheckerContext.testUnitTestsAreDisabledInAgp() {
+
+    }
+}

kover-gradle-plugin/src/functionalTest/templates/builds/android-ksp/build.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+	id("com.android.library") version "8.13.0"
+	id("org.jetbrains.kotlin.android") version "2.2.20"
+	id("com.google.devtools.ksp") version "2.2.20-2.0.4"
+	id("org.jetbrains.kotlinx.kover") version "0.9.3-SNAPSHOT"
+}
+
+android {
+	namespace = "com.example.lib"
+	compileSdk = 36
+	defaultConfig.minSdk = 24
+}

kover-gradle-plugin/src/functionalTest/templates/builds/android-ksp/settings.gradle.kts

@@ -0,0 +1,17 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+

kover-gradle-plugin/src/main/kotlin/kotlinx/kover/gradle/plugin/appliers/artifacts/AbstractVariantArtifacts.kt

@@ -90,12 +90,12 @@ internal sealed class AbstractVariantArtifacts(
 
         // local files and compile tasks
         val kotlinCompileTasks = compilations.map { compilation -> compilation.mapNotNull { it.kotlin.compileTask } }
-        val kotlinOutputs = compilations.map { compilation -> compilation.flatMap { it.kotlin.outputs } }
+        val kotlinOutputs = compilations.map { compilation -> compilation.map { it.kotlin.outputs } }
 
         val javaCompileTasks =
             compilations.map { compilation -> if (variantConfig.sources.excludeJava.get()) emptyList() else compilation.mapNotNull { it.java.compileTask } }
         val javaOutputs =
-            compilations.map { compilation -> if (variantConfig.sources.excludeJava.get()) emptyList() else compilation.flatMap { it.java.outputs } }
+            compilations.map { compilation -> if (variantConfig.sources.excludeJava.get()) emptyList() else compilation.map { it.java.outputs } }
 
 
         val sources = compilations.map { unit -> unit.flatMap { it.sources } }

kover-gradle-plugin/src/main/kotlin/kotlinx/kover/gradle/plugin/appliers/origin/VariantOrigin.kt

@@ -6,6 +6,7 @@ package kotlinx.kover.gradle.plugin.appliers.origin
 
 import kotlinx.kover.gradle.plugin.commons.AndroidBuildVariant
 import org.gradle.api.Task
+import org.gradle.api.file.FileCollection
 import org.gradle.api.provider.Provider
 import org.gradle.api.tasks.TaskCollection
 import org.gradle.api.tasks.testing.Test
@@ -53,7 +54,7 @@ internal class LanguageCompilation(
     /**
      * Directories with compiled classes, outputs of [compileTasks].
      */
-    val outputs: Set<File>,
+    val outputs: FileCollection,
 
     /**
      * In case when no one compile tasks will be triggered,

kover-gradle-plugin/src/main/kotlin/kotlinx/kover/gradle/plugin/locators/Jvm.kt

@@ -29,13 +29,13 @@ private fun extractJvmCompilation(
         it["kotlin"].valueCollection("srcDirs")
     }.toSet()
 
-    val kotlinOutputs = compilation["output"].value<ConfigurableFileCollection>("classesDirs").files.filterNot<File> {
-        isJavaOutput(it)
-    }.toSet()
+    val kotlinOutputs = compilation["output"]
+        .value<ConfigurableFileCollection>("classesDirs")
+        .filter { file -> !isJavaOutput(file) }
 
-    val javaOutputs = compilation["output"].value<ConfigurableFileCollection>("classesDirs").files.filter<File> {
-        isJavaOutput(it)
-    }.toSet()
+    val javaOutputs = compilation["output"]
+        .value<ConfigurableFileCollection>("classesDirs")
+        .filter { file -> isJavaOutput(file) }
 
     val kotlinCompileTask = compilation.value<Task>("compileKotlinTask")
     val javaCompileTask = compilation.valueOrNull<TaskProvider<Task>?>("compileJavaTaskProvider")?.orNull

kover-gradle-plugin/src/main/kotlin/kotlinx/kover/gradle/plugin/locators/KotlinMultiPlatformLocator.kt

@@ -124,7 +124,7 @@ private fun DynamicBean.extractKmpAndroidLibraryVariant(): Map<String, Compilati
                 it["kotlin"].valueCollection("srcDirs")
             }.toSet()
 
-            val kotlinOutputs = compilation["output"].value<ConfigurableFileCollection>("classesDirs").files.toSet()
+            val kotlinOutputs = compilation["output"].value<ConfigurableFileCollection>("classesDirs")
             val kotlinCompileTask = compilation.valueOrNull<TaskProvider<Task>?>("compileTaskProvider")?.orNull
             val kotlin = LanguageCompilation(kotlinOutputs, kotlinCompileTask)
             // at the moment, there is no way to get a task and directives for javac from the compilation