Add kotlin.incremental project property to gradle

Allows turning on incremental compilation by passing
'-Pkotlin.incremental=true' in command line
or specifying it in a 'local.properties' file

Changelog.md

@@ -35,6 +35,9 @@
 - Show error message when debug info for some local variable is corrupted
 - [KT-11638](https://youtrack.jetbrains.com/issue/KT-11638) Fixed hashCode() implementation in "Generate equals/hashCode" action
 
+### Tools.Gradle
+- Added project property 'kotlin.incremental'
+
 ## 1.0.1-2
 
 ### Compiler

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt

@@ -106,6 +106,7 @@ abstract class KotlinSourceSetProcessor<T : AbstractCompile>(
         javaBasePlugin.configureForSourceSet(sourceSet, kotlinTask)
         kotlinTask.description = taskDescription
         kotlinTask.source(kotlinDirSet)
+        mapKotlinTaskProperties(project, kotlinTask)
     }
 }
 
@@ -376,6 +377,7 @@ open class KotlinAndroidPlugin @Inject constructor(val scriptHandler: ScriptHand
 
             val kotlinTaskName = "compile${variantDataName.capitalize()}Kotlin"
             val kotlinTask = tasksProvider.createKotlinJVMTask(project, kotlinTaskName)
+            mapKotlinTaskProperties(project, kotlinTask)
 
             kotlinTask.extensions.extraProperties.set("defaultModuleName", "${project.name}-$kotlinTaskName")
             if (kotlinOptions != null) {

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinProperties.kt

@@ -0,0 +1,28 @@
+package org.jetbrains.kotlin.gradle.plugin
+
+import org.gradle.api.Project
+import org.gradle.api.tasks.compile.AbstractCompile
+
+fun mapKotlinTaskProperties(project: Project, task: AbstractCompile) {
+    for (mapping in propertyMappings) {
+        mapping.apply(project, task)
+    }
+}
+
+private val propertyMappings = listOf(
+        KotlinPropertyMapping("kotlin.incremental", "experimentalIncremental", String::toBoolean)
+)
+
+private class KotlinPropertyMapping<T>(
+        private val projectPropName: String,
+        private val taskPropName: String,
+        private val transform: (String) -> T
+) {
+    fun apply(project: Project, task: AbstractCompile) {
+        if (!project.hasProperty(projectPropName)) return
+
+        val value = project.property(projectPropName) as? String ?: return
+        val transformedValue = transform(value) ?: return
+        task.setProperty(taskPropName, transformedValue)
+    }
+}

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt

@@ -70,6 +70,7 @@ abstract class BaseGradleIT {
     data class BuildOptions(
             val withDaemon: Boolean = false,
             val daemonOptionSupported: Boolean = true,
+            val incremental: Boolean? = null,
             /**
              * @see [ThreadTracker]
              */
@@ -201,8 +202,8 @@ abstract class BaseGradleIT {
     private fun Project.createBuildCommand(params: Array<out String>, options: BuildOptions): List<String> =
             createGradleCommand(createGradleTailParameters(options, params))
 
-    protected fun Project.createGradleTailParameters(options: BuildOptions, tasks: Array<out String> = arrayOf()): List<String> =
+    private fun Project.createGradleTailParameters(options: BuildOptions, params: Array<out String> = arrayOf()): List<String> =
-            tasks.toMutableList().apply {
+            params.toMutableList().apply {
                 add("--stacktrace")
                 add("--${minLogLevel.name.toLowerCase()}")
                 if (options.daemonOptionSupported) {
@@ -213,6 +214,8 @@ abstract class BaseGradleIT {
                 if (options.assertThreadLeaks) {
                     add("-P${ThreadTracker.ASSERT_THREAD_LEAKS_PROPERTY}=true")
                 }
+                options.incremental?.let { add("-Pkotlin.incremental=$it") }
+            }
 
             }
 

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt

@@ -127,13 +127,14 @@ class KotlinGradleIT: BaseGradleIT() {
 
     @Test
     fun testSimpleMultiprojectIncremental() {
-
         fun Project.modify(body: Project.() -> Unit): Project {
             this.body()
             return this
         }
 
-        Project("multiprojectWithDependency", "1.6").build("-PincrementalOption=true", "assemble") {
+        val incremental = defaultBuildOptions().copy(incremental = true)
+
+        Project("multiprojectWithDependency", "1.6").build("assemble", options = incremental) {
             assertSuccessful()
             assertReportExists("projA")
             assertContains(":projA:compileKotlin")
@@ -148,7 +149,7 @@ class KotlinGradleIT: BaseGradleIT() {
             assertTrue { oldSrc.exists() }
             assertTrue { newSrc.exists() }
             newSrc.copyTo(oldSrc, overwrite = true)
-        }.build("-PincrementalOption=true", "assemble") {
+        }.build("assemble", options = incremental) {
             assertSuccessful()
             assertReportExists("projA")
             assertContains(":projA:compileKotlin")

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginJpsParametrizedCLIOnly.kt

@@ -1,6 +1,5 @@
 package org.jetbrains.kotlin.gradle
 
-import org.junit.Ignore
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.junit.runners.Parameterized
@@ -24,7 +23,8 @@ class KotlinGradlePluginJpsParametrizedCLIOnly : BaseIncrementalGradleIT() {
         JpsTestProject(jpsResourcesPath, relativePath).performAndAssertBuildStages(weakTesting = true)
     }
 
-    override fun defaultBuildOptions(): BuildOptions = BuildOptions(withDaemon = true)
+    override fun defaultBuildOptions(): BuildOptions =
+            BuildOptions(withDaemon = true, incremental = true)
 
     companion object {
 

libraries/tools/kotlin-gradle-plugin/src/test/resources/incrementalGradleProject/build.gradle

@@ -22,10 +22,6 @@ sourceSets {
     }
 }
 
-compileKotlin {
-    experimentalIncremental = true
-}
-
 repositories {
     maven {
         url 'file://' + pathToKotlinPlugin

libraries/tools/kotlin-gradle-plugin/src/test/resources/testProject/multiprojectWithDependency/projA/build.gradle

@@ -7,7 +7,3 @@ repositories {
   }
 }
 
-compileKotlin {
-  experimentalIncremental = incrementalOption
-}
-

libraries/tools/kotlin-gradle-plugin/src/test/resources/testProject/multiprojectWithDependency/projB/build.gradle

@@ -9,8 +9,4 @@ repositories {
 
 dependencies {
     compile project(':projA')
-}
+}
-
-compileKotlin {
-    experimentalIncremental = incrementalOption
-}