Inverted the flags for disabling instrumentation of test tasks

The name `IsEnabled` is misleading in that it seems that if you wrote `IsEnabled = true` instrumentation should work anyway.
`isDisabled` guarantees that if you assigned it `true`, then the task instrumentation will definitely not happen. However, this does not guarantee instrumentation if the value is `false`.

README.md

@@ -116,7 +116,7 @@ For example, to configure a standard test task for Kotlin/JVM named `test`, you
 ```kotlin
 tasks.test {
     extensions.configure(kotlinx.kover.api.KoverTaskExtension::class) {
-        isEnabled = true
+        isDisabled = false
         binaryReportFile.set(file("$buildDir/custom/result.bin"))
         includes = listOf("com.example.*")
         excludes = listOf("com.example.subpackage.*")
@@ -131,7 +131,7 @@ tasks.test {
 ```groovy
 tasks.test {
     kover {
-        enabled = true
+        disabled = false
         binaryReportFile.set(file("$buildDir/custom/result.bin"))
         includes = ['com.example.*']
         excludes = ['com.example.subpackage.*']
@@ -154,7 +154,7 @@ android {
         unitTests.all {
             if (it.name == "testDebugUnitTest") {
                 extensions.configure(kotlinx.kover.api.KoverTaskExtension::class) {
-                    isEnabled = true
+                    isDisabled = false
                     binaryReportFile.set(file("$buildDir/custom/debug-report.bin"))
                     includes = listOf("com.example.*")
                     excludes = listOf("com.example.subpackage.*")
@@ -178,7 +178,7 @@ android {
         unitTests.all {
             if (name == "testDebugUnitTest") {
                 kover {
-                    enabled = true
+                    disabled = false
                     binaryReportFile.set(file("$buildDir/custom/debug-report.bin"))
                     includes = ['com.example.*']
                     excludes = ['com.example.subpackage.*']
@@ -298,7 +298,7 @@ In the module in which the plugin is applied, you need to add code:
 
 ```kotlin
 kover {
-    isEnabled = true                        // false to disable instrumentation of all test tasks in all modules
+    isDisabled = false                      // true to disable instrumentation of all test tasks in all modules
     coverageEngine.set(kotlinx.kover.api.CoverageEngine.INTELLIJ) // change instrumentation agent and reporter
     intellijEngineVersion.set("1.0.640")    // change version of IntelliJ agent and reporter
     jacocoEngineVersion.set("0.8.7")        // change version of JaCoCo agent and reporter
@@ -313,7 +313,7 @@ kover {
 
 ```groovy
 kover {
-    enabled = true                          // false to disable instrumentation of all test tasks in all modules
+    disabled = false                        // true to disable instrumentation of all test tasks in all modules
     coverageEngine.set(kotlinx.kover.api.CoverageEngine.INTELLIJ) // change instrumentation agent and reporter
     intellijEngineVersion.set('1.0.640')    // change version of IntelliJ agent and reporter
     jacocoEngineVersion.set('0.8.7')        // change version of JaCoCo agent and reporter

src/main/kotlin/kotlinx/kover/KoverPlugin.kt

@@ -237,7 +237,7 @@ class KoverPlugin : Plugin<Project> {
 
     private fun Project.createKoverExtension(): KoverExtension {
         val extension = extensions.create(ROOT_EXTENSION_NAME, KoverExtension::class.java, objects)
-        extension.isEnabled = true
+        extension.isDisabled = false
         extension.coverageEngine.set(CoverageEngine.INTELLIJ)
         extension.intellijEngineVersion.set(defaultIntellijVersion.toString())
         extension.jacocoEngineVersion.set(defaultJacocoVersion)
@@ -251,7 +251,7 @@ class KoverPlugin : Plugin<Project> {
     ) {
         val taskExtension = extensions.create(TASK_EXTENSION_NAME, KoverTaskExtension::class.java, project.objects)
 
-        taskExtension.isEnabled = true
+        taskExtension.isDisabled = false
         taskExtension.binaryReportFile.set(this.project.provider {
             val koverExtension = providers.koverExtension.get()
             val suffix = if (koverExtension.coverageEngine.get() == CoverageEngine.INTELLIJ) ".ic" else ".exec"
@@ -311,8 +311,8 @@ private class CoverageArgumentProvider(
         val koverExtensionValue = koverExtension.get()
         val taskExtensionValue = taskExtension.get()
 
-        if (!taskExtensionValue.isEnabled
-            || !koverExtensionValue.isEnabled
+        if (taskExtensionValue.isDisabled
+            || koverExtensionValue.isDisabled
             || koverExtensionValue.disabledModules.contains(task.project.name)
         ) {
             return mutableListOf()

src/main/kotlin/kotlinx/kover/Providers.kt

@@ -73,7 +73,7 @@ internal fun Project.testTasks(rootProject: Project): List<Test> {
     }
 
     return tasks.withType(Test::class.java)
-        .filter { t -> t.extensions.getByType(KoverTaskExtension::class.java).isEnabled }
+        .filterNot { t -> t.extensions.getByType(KoverTaskExtension::class.java).isDisabled }
 }
 
 internal fun Project.binaryReports(root: Project): List<File> {
@@ -84,7 +84,7 @@ internal fun Project.binaryReports(root: Project): List<File> {
     return tasks.withType(Test::class.java).asSequence()
         .map { t -> t.extensions.getByType(KoverTaskExtension::class.java) }
         // process binary report only from tasks with enabled cover
-        .filter { e -> e.isEnabled }
+        .filterNot { e -> e.isDisabled }
         .map { e -> e.binaryReportFile.get() }
         // process binary report only from tasks with sources
         .filter { f -> f.exists() }
@@ -98,7 +98,7 @@ internal fun Project.smapFiles(root: Project): List<File> {
 
     return tasks.withType(Test::class.java).asSequence()
         .map { t -> t.extensions.getByType(KoverTaskExtension::class.java) }
-        .filter { e -> e.isEnabled }
+        .filterNot { e -> e.isDisabled }
         .mapNotNull { e -> e.smapFile.orNull }
         /*
          Binary reports and SMAP files have same ordering for IntelliJ engine:

src/main/kotlin/kotlinx/kover/api/KoverExtension.kt

@@ -11,10 +11,10 @@ import org.gradle.api.tasks.*
 open class KoverExtension(objects: ObjectFactory) {
 
     /**
-     * Specifies whether the plugin is applied to the test task and configures it to collect and generate coverage data.
+     * Specifies whether instrumentation is disabled for all test tasks of all modules.
      */
     @get:Input
-    public var isEnabled: Boolean = true
+    public var isDisabled: Boolean = false
 
     /**
      * Specifies the coverage engine to be used to collect execution data.

src/main/kotlin/kotlinx/kover/api/KoverTaskExtension.kt

@@ -17,10 +17,10 @@ import java.io.*
  */
 open class KoverTaskExtension(objects: ObjectFactory) {
     /**
-     * Specifies whether the plugin is applied to the test task and configures it to collect and generate coverage data.
+     * Specifies whether instrumentation is disabled for an extended test task.
      */
     @get:Input
-    public var isEnabled: Boolean = true
+    public var isDisabled: Boolean = false
 
     /**
      * Specifies file path of generated binary file with coverage data.