Merge pull request #1 from kamilok1965/rework_gradle_plugin

Rework gradle plugin

7 files changed, 450 insertions, 617 deletions

diff --git a/runners/android-gradle-plugin/src/main/kotlin/mainAndroid.kt b/runners/android-gradle-plugin/src/main/kotlin/mainAndroid.kt
index b1996da0..367b9257 100644
--- a/runners/android-gradle-plugin/src/main/kotlin/mainAndroid.kt
+++ b/runners/android-gradle-plugin/src/main/kotlin/mainAndroid.kt
@@ -4,6 +4,7 @@ import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.tasks.Input
 import org.jetbrains.dokka.DokkaConfiguration.ExternalDocumentationLink.Builder
+import org.jetbrains.dokka.DokkaConfiguration.SourceRoot
 import java.io.File
 
 open class DokkaAndroidPlugin : Plugin<Project> {
diff --git a/runners/gradle-plugin/build.gradle b/runners/gradle-plugin/build.gradle
index 97a6b697..adcfd009 100644
--- a/runners/gradle-plugin/build.gradle
+++ b/runners/gradle-plugin/build.gradle
@@ -28,7 +28,7 @@ dependencies {
 
     compileOnly gradleApi()
     compileOnly localGroovy()
-    implementation 'com.google.code.gson:gson:2.8.5'
+    implementation "com.google.code.gson:gson:$gson_version"
 }
 
 task sourceJar(type: Jar) {
diff --git a/runners/gradle-plugin/src/main/kotlin/main.kt b/runners/gradle-plugin/src/main/kotlin/main.kt
deleted file mode 100644
index 555dece4..00000000
--- a/runners/gradle-plugin/src/main/kotlin/main.kt
+++ /dev/null
@@ -1,612 +0,0 @@
-package org.jetbrains.dokka.gradle
-
-import com.google.gson.GsonBuilder
-import groovy.lang.Closure
-import org.gradle.api.*
-import org.gradle.api.artifacts.Configuration
-import org.gradle.api.file.FileCollection
-import org.gradle.api.plugins.JavaBasePlugin
-import org.gradle.api.plugins.JavaPluginConvention
-import org.gradle.api.tasks.*
-import org.gradle.api.tasks.Optional
-import org.gradle.api.tasks.compile.AbstractCompile
-import org.jetbrains.dokka.*
-import org.jetbrains.dokka.ReflectDsl.isNotInstance
-import org.jetbrains.dokka.gradle.ClassloaderContainer.fatJarClassLoader
-import org.jetbrains.dokka.gradle.DokkaVersion.version
-
-import java.io.File
-import java.io.InputStream
-import java.io.Serializable
-import java.net.URL
-import java.net.URLClassLoader
-import java.util.*
-import java.util.concurrent.Callable
-import java.util.function.BiConsumer
-
-open class DokkaPlugin : Plugin<Project> {
-
-    override fun apply(project: Project) {
-        DokkaVersion.loadFrom(javaClass.getResourceAsStream("/META-INF/gradle-plugins/org.jetbrains.dokka.properties"))
-
-        val passConfiguration= project.container(GradlePassConfigurationImpl::class.java)
-        project.extensions.add("passConfigurations", passConfiguration)
-
-        project.tasks.create("dokka", DokkaTask::class.java).apply {
-            dokkaRuntime = project.configurations.create("dokkaRuntime")
-            moduleName = project.name
-            outputDirectory = File(project.buildDir, "dokka").absolutePath
-        }
-    }
-}
-
-
-object DokkaVersion {
-    var version: String? = null
-
-    fun loadFrom(stream: InputStream) {
-        version = Properties().apply {
-            load(stream)
-        }.getProperty("dokka-version")
-    }
-}
-
-
-object ClassloaderContainer {
-    @JvmField
-    var fatJarClassLoader: ClassLoader? = null
-}
-
-
-open class DokkaTask : DefaultTask() {
-
-    fun defaultKotlinTasks() = with(ReflectDsl) {
-        val abstractKotlinCompileClz = try {
-            project.buildscript.classLoader.loadClass(ABSTRACT_KOTLIN_COMPILE)
-        } catch (cnfe: ClassNotFoundException) {
-            logger.warn("$ABSTRACT_KOTLIN_COMPILE class not found, default kotlin tasks ignored")
-            return@with emptyList<Task>()
-        }
-
-        return@with project.tasks.filter { it isInstance abstractKotlinCompileClz }.filter { "Test" !in it.name }
-    }
-
-    init {
-        group = JavaBasePlugin.DOCUMENTATION_GROUP
-        description = "Generates dokka documentation for Kotlin"
-
-        @Suppress("LeakingThis")
-        dependsOn(Callable { kotlinTasks.map { it.taskDependencies } })
-    }
-
-    @Input
-    var moduleName: String = ""
-    @Input
-    var outputFormat: String = "html"
-    var outputDirectory: String = ""
-    var dokkaRuntime: Configuration? = null
-
-    @InputFiles var classpath: Iterable<File> = arrayListOf()
-
-    @Input
-    var includes: List<Any?> = arrayListOf()
-    @Input
-    var linkMappings: ArrayList<LinkMapping> = arrayListOf()
-    @Input
-    var samples: List<Any?> = arrayListOf()
-    @Input
-    var jdkVersion: Int = 6
-    @Input
-    var sourceDirs: Iterable<File> = emptyList()
-
-    @Input
-    var sourceRoots: MutableList<SourceRoot> = arrayListOf()
-
-    @Input
-    var dokkaFatJar: Any = "org.jetbrains.dokka:dokka-fatjar:$version"
-
-    @Input var includeNonPublic = false
-    @Input var skipDeprecated = false
-    @Input var skipEmptyPackages = true
-    @Input var reportUndocumented = true
-    @Input var perPackageOptions: MutableList<PackageOptions> = arrayListOf()
-    @Input var impliedPlatforms: MutableList<String> = arrayListOf()
-
-    @Input var externalDocumentationLinks = mutableListOf<DokkaConfiguration.ExternalDocumentationLink>()
-
-    @Input var noStdlibLink: Boolean = false
-
-    @Input
-    var noJdkLink: Boolean = false
-
-    @Optional @Input
-    var cacheRoot: String? = null
-
-
-    @Optional @Input
-    var languageVersion: String? = null
-
-    @Optional @Input
-    var apiVersion: String? = null
-
-    @Input
-    var collectInheritedExtensionsFromLibraries: Boolean = false
-
-    @get:Internal
-    internal val kotlinCompileBasedClasspathAndSourceRoots: ClasspathAndSourceRoots by lazy { extractClasspathAndSourceRootsFromKotlinTasks() }
-
-    @Optional @Input
-    var targets: List<String> = listOf()
-
-//    @Input var passConfigurations: MutableList<GradlePassConfigurationImpl> = arrayListOf()
-
-//    fun passConfiguration(action: Action<GradlePassConfigurationImpl>) {
-//        val passConfig = GradlePassConfigurationImpl()
-//        action.execute(passConfig)
-//        passConfigurations.add(passConfig)
-//    }
-//
-//    fun passConfiguration(closure: Closure<Unit>) {
-//        passConfiguration(Action {
-//            closure.delegate = it
-//            closure.call()
-//        })
-//    }
-
-//    fun passConfiguration(closure: Closure<Unit>) {
-//        closure.call()
-//        passConfiguration = mutableListOf(PassConfigurationImpl(targets = closure.getProperty("targets") as List<String>))
-//    }
-
-    private var kotlinTasksConfigurator: () -> List<Any?>? = { defaultKotlinTasks() }
-    private val kotlinTasks: List<Task> by lazy { extractKotlinCompileTasks() }
-
-    fun kotlinTasks(taskSupplier: Callable<List<Any>>) {
-        kotlinTasksConfigurator = { taskSupplier.call() }
-    }
-
-    fun kotlinTasks(closure: Closure<Any?>) {
-        kotlinTasksConfigurator = { closure.call() as? List<Any?> }
-    }
-
-    fun linkMapping(action: Action<LinkMapping>) {
-        val mapping = LinkMapping()
-        action.execute(mapping)
-
-        if (mapping.path.isEmpty()) {
-            throw IllegalArgumentException("Link mapping should have dir")
-        }
-        if (mapping.url.isEmpty()) {
-            throw IllegalArgumentException("Link mapping should have url")
-        }
-
-        linkMappings.add(mapping)
-    }
-
-    fun linkMapping(closure: Closure<Unit>) {
-        linkMapping(Action { mapping ->
-            closure.delegate = mapping
-            closure.call()
-        })
-    }
-
-    fun sourceRoot(action: Action<SourceRoot>) {
-        val sourceRoot = SourceRoot()
-        action.execute(sourceRoot)
-        sourceRoots.add(sourceRoot)
-    }
-
-    fun sourceRoot(closure: Closure<Unit>) {
-        sourceRoot(Action { sourceRoot ->
-            closure.delegate = sourceRoot
-            closure.call()
-        })
-    }
-
-    fun packageOptions(action: Action<PackageOptions>) {
-        val packageOptions = PackageOptions()
-        action.execute(packageOptions)
-        perPackageOptions.add(packageOptions)
-    }
-
-    fun packageOptions(closure: Closure<Unit>) {
-        packageOptions(Action { packageOptions ->
-            closure.delegate = packageOptions
-            closure.call()
-        })
-    }
-
-    fun externalDocumentationLink(action: Action<DokkaConfiguration.ExternalDocumentationLink.Builder>) {
-        val builder = DokkaConfiguration.ExternalDocumentationLink.Builder()
-        action.execute(builder)
-        externalDocumentationLinks.add(builder.build())
-    }
-
-    fun externalDocumentationLink(closure: Closure<Unit>) {
-        externalDocumentationLink(Action { builder ->
-            closure.delegate = builder
-            closure.call()
-        })
-    }
-
-    fun tryResolveFatJar(project: Project): Set<File> {
-        return try {
-            dokkaRuntime!!.resolve()
-        } catch (e: Exception) {
-            project.parent?.let { tryResolveFatJar(it) } ?: throw e
-        }
-    }
-
-    fun loadFatJar() {
-        if (fatJarClassLoader == null) {
-            val jars = if (dokkaFatJar is File)
-                setOf(dokkaFatJar as File)
-            else
-                tryResolveFatJar(project)
-            fatJarClassLoader = URLClassLoader(jars.map { it.toURI().toURL() }.toTypedArray(), ClassLoader.getSystemClassLoader().parent)
-        }
-    }
-
-    internal data class ClasspathAndSourceRoots(val classpathFileCollection: FileCollection, val sourceRoots: List<File>) : Serializable
-
-    private fun extractKotlinCompileTasks(): List<Task> {
-        val inputList = (kotlinTasksConfigurator.invoke() ?: emptyList()).filterNotNull()
-        val (paths, other) = inputList.partition { it is String }
-
-        val taskContainer = project.tasks
-
-        val tasksByPath = paths.map { taskContainer.findByPath(it as String) ?: throw IllegalArgumentException("Task with path '$it' not found") }
-
-        other
-            .filter { it !is Task || it isNotInstance getAbstractKotlinCompileFor(it) }
-            .forEach { throw IllegalArgumentException("Illegal entry in kotlinTasks, must be subtype of $ABSTRACT_KOTLIN_COMPILE or String, but was $it") }
-
-        tasksByPath
-            .filter { it == null || it isNotInstance getAbstractKotlinCompileFor(it) }
-            .forEach { throw IllegalArgumentException("Illegal task path in kotlinTasks, must be subtype of $ABSTRACT_KOTLIN_COMPILE, but was $it") }
-
-
-        return (tasksByPath + other) as List<Task>
-    }
-
-    private fun extractClasspathAndSourceRootsFromKotlinTasks(): ClasspathAndSourceRoots {
-
-        val allTasks = kotlinTasks
-
-        val allClasspath = mutableSetOf<File>()
-        var allClasspathFileCollection: FileCollection = project.files()
-        val allSourceRoots = mutableSetOf<File>()
-
-        allTasks.forEach {
-
-            logger.debug("Dokka found AbstractKotlinCompile task: $it")
-            with(ReflectDsl) {
-                val taskSourceRoots: List<File> = it["sourceRootsContainer"]["sourceRoots"].v()
-
-                val abstractKotlinCompileClz = getAbstractKotlinCompileFor(it)!!
-
-                val taskClasspath: Iterable<File> =
-                    (it["getClasspath", AbstractCompile::class].takeIfIsFunc()?.invoke()
-                            ?: it["compileClasspath", abstractKotlinCompileClz].takeIfIsProp()?.v()
-                            ?: it["getClasspath", abstractKotlinCompileClz]())
-
-                if (taskClasspath is FileCollection) {
-                    allClasspathFileCollection += taskClasspath
-                } else {
-                    allClasspath += taskClasspath
-                }
-                allSourceRoots += taskSourceRoots.filter { it.exists() }
-            }
-        }
-
-        return ClasspathAndSourceRoots(allClasspathFileCollection + project.files(allClasspath), allSourceRoots.toList())
-    }
-
-    private fun Iterable<File>.toSourceRoots(): List<SourceRoot> = this.filter { it.exists() }.map { SourceRoot().apply { path = it.path } }
-
-    protected open fun collectSuppressedFiles(sourceRoots: List<SourceRoot>): List<String> = emptyList()
-
-    @TaskAction
-    fun generate() {
-        if (dokkaRuntime == null){
-            dokkaRuntime = project.configurations.getByName("dokkaRuntime")
-        }
-
-
-        dokkaRuntime?.defaultDependencies{ dependencies -> dependencies.add(project.dependencies.create(dokkaFatJar)) }
-        val kotlinColorsEnabledBefore = System.getProperty(COLORS_ENABLED_PROPERTY) ?: "false"
-        System.setProperty(COLORS_ENABLED_PROPERTY, "false")
-        try {
-            loadFatJar()
-
-            val (tasksClasspath, tasksSourceRoots) = kotlinCompileBasedClasspathAndSourceRoots
-
-            val sourceRoots = collectSourceRoots() + tasksSourceRoots.toSourceRoots()
-            if (sourceRoots.isEmpty()) {
-                logger.warn("No source directories found: skipping dokka generation")
-                return
-            }
-
-            val fullClasspath = tasksClasspath + classpath
-
-            val bootstrapClass = fatJarClassLoader!!.loadClass("org.jetbrains.dokka.DokkaBootstrapImpl")
-            val bootstrapInstance = bootstrapClass.constructors.first().newInstance()
-            val bootstrapProxy: DokkaBootstrap = automagicTypedProxy(javaClass.classLoader, bootstrapInstance)
-
-            val gson = GsonBuilder().setPrettyPrinting().create()
-
-
-            val configuration = GradleDokkaConfigurationImpl()
-            configuration.outputDir = outputDirectory
-            configuration.format = outputFormat
-            configuration.generateIndexPages = true
-            configuration.cacheRoot = cacheRoot
-            configuration.impliedPlatforms = impliedPlatforms
-            configuration.passesConfigurations =
-                (project.extensions.getByName("passConfigurations") as Iterable<GradlePassConfigurationImpl>)
-                .toList()
-                .map { defaultPassConfiguration(it) }
-
-//                listOf(PassConfigurationImpl(
-//                    classpath= fullClasspath.map { it.absolutePath },
-//                    sourceRoots = sourceRoots.map { SourceRootImpl(it.path) },
-//                    samples = samples.filterNotNull().map { project.file(it).absolutePath },
-//                    includes = includes.filterNotNull().map { project.file(it).absolutePath },
-//                    collectInheritedExtensionsFromLibraries = collectInheritedExtensionsFromLibraries,
-//                    perPackageOptions = perPackageOptions.map{PackageOptionsImpl(
-//                        prefix = it.prefix,
-//                        includeNonPublic = it.includeNonPublic,
-//                        reportUndocumented = it.reportUndocumented,
-//                        skipDeprecated = it.skipDeprecated,
-//                        suppress = it.suppress
-//                        )},
-//                    moduleName = moduleName,
-//                    includeNonPublic = includeNonPublic,
-//                    includeRootPackage = false,
-//                    reportUndocumented = reportUndocumented,
-//                    skipEmptyPackages = skipEmptyPackages,
-//                    skipDeprecated = skipDeprecated,
-//                    jdkVersion = jdkVersion,
-//                    languageVersion = languageVersion,
-//                    apiVersion = apiVersion,
-//                    noStdlibLink = noStdlibLink,
-//                    noJdkLink = noJdkLink,
-//                    suppressedFiles = collectSuppressedFiles(sourceRoots),
-//                    sinceKotlin = "1.0",
-//                    analysisPlatform = Platform.DEFAULT,
-//                    targets = emptyList(),
-//                    sourceLinks = mutableListOf(), // TODO: check this line
-//                    externalDocumentationLinks = externalDocumentationLinks.map {
-//                        ExternalDocumentationLinkImpl(it.url, it.packageListUrl)
-//                        }
-//                    )
-//                )
-//            )
-
-            bootstrapProxy.configure(
-                BiConsumer { level, message ->
-                    when (level) {
-                        "info" -> logger.info(message)
-                        "warn" -> logger.warn(message)
-                        "error" -> logger.error(message)
-                    }
-                },
-                gson.toJson(configuration)
-            )
-
-            bootstrapProxy.generate()
-
-        } finally {
-            System.setProperty(COLORS_ENABLED_PROPERTY, kotlinColorsEnabledBefore)
-        }
-    }
-
-    private fun defaultPassConfiguration(passConfig: GradlePassConfigurationImpl): GradlePassConfigurationImpl{
-
-        fun Closure<Unit>.setDelegateAndCall(delegate: Any) {
-            this.delegate = delegate
-            this.call()
-            this.delegate
-        }
-
-        val (tasksClasspath, tasksSourceRoots) = kotlinCompileBasedClasspathAndSourceRoots
-
-        val fullClasspath = tasksClasspath + classpath
-        passConfig.moduleName = moduleName
-        passConfig.classpath = fullClasspath.map { it.absolutePath }
-        passConfig.sourceRoots = sourceRoots.map { SourceRootImpl(it.path) }
-        passConfig.samples = samples.filterNotNull().map { project.file(it).absolutePath }
-        passConfig.includes = includes.filterNotNull().map { project.file(it).absolutePath }
-        passConfig.collectInheritedExtensionsFromLibraries = collectInheritedExtensionsFromLibraries
-
-        passConfig.perPackageOptions = ((passConfig.perPackageOptions as List<Closure<Unit>>).map {
-            it.setDelegateAndCall(GradlePackageOptionsImpl())
-        }) as List<PackageOptionsImpl>
-
-        passConfig.suppressedFiles = collectSuppressedFiles(sourceRoots)
-        passConfig.sourceLinks = ((passConfig.sourceLinks as List<Closure<Unit>>).map {
-            it.setDelegateAndCall(GradleSourceLinkDefinitionImpl())
-        }) as MutableList<GradleSourceLinkDefinitionImpl> // TODO: Parse source links?
-
-        passConfig.externalDocumentationLinks = ((passConfig.externalDocumentationLinks as List<Closure<Unit>>).map {
-            it.setDelegateAndCall(GradleExternalDocumentationLinkImpl())
-        }) as List<ExternalDocumentationLinkImpl>
-
-        return passConfig
-    }
-
-
-    private fun collectSourceRoots(): List<SourceRoot> {
-        val sourceDirs = if (sourceDirs.any()) {
-            logger.info("Dokka: Taking source directories provided by the user")
-            sourceDirs.toSet()
-        } else if (kotlinTasks.isEmpty()) {
-            project.convention.findPlugin(JavaPluginConvention::class.java)?.let { javaPluginConvention ->
-                logger.info("Dokka: Taking source directories from default java plugin")
-                val sourceSets = javaPluginConvention.sourceSets.findByName(SourceSet.MAIN_SOURCE_SET_NAME)
-                sourceSets?.allSource?.srcDirs
-            }
-        } else {
-            emptySet()
-        }
-
-        return sourceRoots + (sourceDirs?.toSourceRoots() ?: emptyList())
-    }
-
-
-    @Classpath
-    fun getInputClasspath(): FileCollection {
-        val (classpathFileCollection) = extractClasspathAndSourceRootsFromKotlinTasks()
-        return project.files(classpath) + classpathFileCollection
-    }
-
-    @InputFiles
-    fun getInputFiles(): FileCollection {
-        val (_, tasksSourceRoots) = extractClasspathAndSourceRootsFromKotlinTasks()
-        return project.files(tasksSourceRoots.map { project.fileTree(it) }) +
-                project.files(collectSourceRoots().map { project.fileTree(File(it.path)) }) +
-                project.files(includes) +
-                project.files(samples.filterNotNull().map { project.fileTree(it) })
-    }
-
-    @OutputDirectory
-    fun getOutputDirectoryAsFile(): File = project.file(outputDirectory)
-
-    companion object {
-        const val COLORS_ENABLED_PROPERTY = "kotlin.colors.enabled"
-        const val ABSTRACT_KOTLIN_COMPILE = "org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile"
-
-        private fun getAbstractKotlinCompileFor(task: Task) = try {
-            task.project.buildscript.classLoader.loadClass(ABSTRACT_KOTLIN_COMPILE)
-        } catch (e: ClassNotFoundException) {
-            null
-        }
-    }
-
-}
-
-class SourceRoot : DokkaConfiguration.SourceRoot, Serializable {
-    override var path: String = ""
-        set(value) {
-            field = File(value).absolutePath
-        }
-
-    override fun toString(): String = path
-}
-
-open class LinkMapping : Serializable, DokkaConfiguration.SourceLinkDefinition {
-    var dir: String
-        get() = path
-        set(value) {
-            if (value.contains("\\"))
-                throw java.lang.IllegalArgumentException("Incorrect dir property, only Unix based path allowed.")
-            else path = value
-        }
-
-    override var path: String = ""
-    override var url: String = ""
-
-    var suffix: String?
-        get() = lineSuffix
-        set(value) {
-            lineSuffix = value
-        }
-
-    override var lineSuffix: String? = null
-
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (other?.javaClass != javaClass) return false
-
-        other as LinkMapping
-
-        if (path != other.path) return false
-        if (url != other.url) return false
-        if (lineSuffix != other.lineSuffix) return false
-
-        return true
-    }
-
-    override fun hashCode(): Int {
-        var result = path.hashCode()
-        result = 31 * result + url.hashCode()
-        result = 31 * result + (lineSuffix?.hashCode() ?: 0)
-        return result
-    }
-
-    companion object {
-        const val serialVersionUID: Long = -8133501684312445981L
-    }
-}
-
-class PackageOptions : Serializable, DokkaConfiguration.PackageOptions {
-    override var prefix: String = ""
-    override var includeNonPublic: Boolean = false
-    override var reportUndocumented: Boolean = true
-    override var skipDeprecated: Boolean = false
-    override var suppress: Boolean = false
-}
-
-open class GradlePassConfigurationImpl(@Transient val name: String = ""): DokkaConfiguration.PassConfiguration {
-    override var classpath: List<String> = emptyList()
-    override var moduleName: String = ""
-    override var sourceRoots: List<SourceRootImpl> = emptyList()
-    override var samples: List<String> = emptyList()
-    override var includes: List<String> = emptyList()
-    override var includeNonPublic: Boolean = false
-    override var includeRootPackage: Boolean = false
-    override var reportUndocumented: Boolean = false
-    override var skipEmptyPackages: Boolean = false
-    override var skipDeprecated: Boolean = false
-    override var jdkVersion: Int = 6
-    override var sourceLinks: List<GradleSourceLinkDefinitionImpl> = emptyList()
-    override var perPackageOptions: List<PackageOptionsImpl> = emptyList()
-    override var externalDocumentationLinks: List<ExternalDocumentationLinkImpl> = emptyList()
-    override var languageVersion: String? = null
-    override var apiVersion: String? = null
-    override var noStdlibLink: Boolean = false
-    override var noJdkLink: Boolean = false
-    override var suppressedFiles: List<String> = emptyList()
-    override var collectInheritedExtensionsFromLibraries: Boolean = false
-    override var analysisPlatform: Platform = Platform.DEFAULT
-    override var targets: List<String> = listOf("JVM")
-    override var sinceKotlin: String = "1.0"
-}
-
-class GradleSourceLinkDefinitionImpl : DokkaConfiguration.SourceLinkDefinition {
-    override var path: String = ""
-    override var url: String = ""
-    override var lineSuffix: String? = null
-
-    companion object {
-        fun parseSourceLinkDefinition(srcLink: String): SourceLinkDefinitionImpl {
-            val (path, urlAndLine) = srcLink.split('=')
-            return SourceLinkDefinitionImpl(
-                File(path).canonicalPath,
-                urlAndLine.substringBefore("#"),
-                urlAndLine.substringAfter("#", "").let { if (it.isEmpty()) null else "#$it" })
-        }
-    }
-}
-
-class GradleExternalDocumentationLinkImpl : DokkaConfiguration.ExternalDocumentationLink {
-    override var url: URL = URL("")
-    override var packageListUrl: URL = URL("")
-}
-
-class GradleDokkaConfigurationImpl: DokkaConfiguration {
-    override var outputDir: String = ""
-    override var format: String = "html"
-    override var generateIndexPages: Boolean = false
-    override var cacheRoot: String? = null
-    override var impliedPlatforms: List<String> = emptyList()
-    override var passesConfigurations: List<GradlePassConfigurationImpl> = emptyList()
-}
-
-class GradlePackageOptionsImpl: DokkaConfiguration.PackageOptions {
-    override var prefix: String = ""
-    override val includeNonPublic: Boolean = false
-    override val reportUndocumented: Boolean = true
-    override val skipDeprecated: Boolean = true
-    override val suppress: Boolean = false
-}
\ No newline at end of file
diff --git a/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/DokkaTask.kt b/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/DokkaTask.kt
new file mode 100644
index 00000000..6c93188b
--- /dev/null
+++ b/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/DokkaTask.kt
@@ -0,0 +1,275 @@
+package org.jetbrains.dokka.gradle
+
+import com.google.gson.GsonBuilder
+import groovy.lang.Closure
+import org.gradle.api.DefaultTask
+import org.gradle.api.Project
+import org.gradle.api.Task
+import org.gradle.api.artifacts.Configuration
+import org.gradle.api.file.FileCollection
+import org.gradle.api.plugins.JavaBasePlugin
+import org.gradle.api.plugins.JavaPluginConvention
+import org.gradle.api.tasks.*
+import org.gradle.api.tasks.compile.AbstractCompile
+import org.jetbrains.dokka.DokkaBootstrap
+import org.jetbrains.dokka.DokkaConfiguration
+import org.jetbrains.dokka.DokkaConfiguration.SourceRoot
+import org.jetbrains.dokka.ReflectDsl
+import org.jetbrains.dokka.ReflectDsl.isNotInstance
+import java.io.File
+import java.io.Serializable
+import java.net.URLClassLoader
+import java.util.concurrent.Callable
+import java.util.function.BiConsumer
+
+open class DokkaTask : DefaultTask() {
+
+    fun defaultKotlinTasks() = with(ReflectDsl) {
+        val abstractKotlinCompileClz = try {
+            project.buildscript.classLoader.loadClass(ABSTRACT_KOTLIN_COMPILE)
+        } catch (cnfe: ClassNotFoundException) {
+            logger.warn("$ABSTRACT_KOTLIN_COMPILE class not found, default kotlin tasks ignored")
+            return@with emptyList<Task>()
+        }
+
+        return@with project.tasks.filter { it isInstance abstractKotlinCompileClz }.filter { "Test" !in it.name }
+    }
+
+    init {
+        group = JavaBasePlugin.DOCUMENTATION_GROUP
+        description = "Generates dokka documentation for Kotlin"
+
+        @Suppress("LeakingThis")
+        dependsOn(Callable { kotlinTasks.map { it.taskDependencies } })
+    }
+
+    @Input
+    var moduleName: String = ""
+
+    @Input
+    var outputFormat: String = "html"
+
+    @OutputDirectory
+    var outputDirectory: String = ""
+
+    var dokkaRuntime: Configuration? = null
+
+    @InputFiles
+    var classpath: Iterable<File> = arrayListOf()
+
+    @Input
+    var sourceDirs: Iterable<File> = emptyList()
+
+    @Input
+    var sourceRoots: MutableList<DokkaConfiguration.SourceRoot> = arrayListOf()
+
+    @Input
+    var dokkaFatJar: Any = "org.jetbrains.dokka:dokka-fatjar:${DokkaVersion.version}"
+
+    @Input
+    var impliedPlatforms: MutableList<String> = arrayListOf()
+
+    @Optional
+    @Input
+    var cacheRoot: String? = null
+
+    @Input
+    var collectInheritedExtensionsFromLibraries: Boolean = false
+
+    @get:Internal
+    internal val kotlinCompileBasedClasspathAndSourceRoots: ClasspathAndSourceRoots by lazy { extractClasspathAndSourceRootsFromKotlinTasks() }
+
+    protected var externalDocumentationLinks: MutableList<DokkaConfiguration.ExternalDocumentationLink> = mutableListOf()
+
+    private var kotlinTasksConfigurator: () -> List<Any?>? = { defaultKotlinTasks() }
+    private val kotlinTasks: List<Task> by lazy { extractKotlinCompileTasks() }
+
+    fun kotlinTasks(taskSupplier: Callable<List<Any>>) {
+        kotlinTasksConfigurator = { taskSupplier.call() }
+    }
+
+    fun kotlinTasks(closure: Closure<Any?>) {
+        kotlinTasksConfigurator = { closure.call() as? List<Any?> }
+    }
+
+
+    fun tryResolveFatJar(project: Project): Set<File> {
+        return try {
+            dokkaRuntime!!.resolve()
+        } catch (e: Exception) {
+            project.parent?.let { tryResolveFatJar(it) } ?: throw e
+        }
+    }
+
+    fun loadFatJar() {
+        if (ClassloaderContainer.fatJarClassLoader == null) {
+            val jars = if (dokkaFatJar is File)
+                setOf(dokkaFatJar as File)
+            else
+                tryResolveFatJar(project)
+            ClassloaderContainer.fatJarClassLoader = URLClassLoader(jars.map { it.toURI().toURL() }.toTypedArray(), ClassLoader.getSystemClassLoader().parent)
+        }
+    }
+
+    internal data class ClasspathAndSourceRoots(val classpathFileCollection: FileCollection, val sourceRoots: List<File>) :
+        Serializable
+
+    private fun extractKotlinCompileTasks(): List<Task> {
+        val inputList = (kotlinTasksConfigurator.invoke() ?: emptyList()).filterNotNull()
+        val (paths, other) = inputList.partition { it is String }
+
+        val taskContainer = project.tasks
+
+        val tasksByPath = paths.map { taskContainer.findByPath(it as String) ?: throw IllegalArgumentException("Task with path '$it' not found") }
+
+        other
+            .filter { it !is Task || it isNotInstance getAbstractKotlinCompileFor(it) }
+            .forEach { throw IllegalArgumentException("Illegal entry in kotlinTasks, must be subtype of $ABSTRACT_KOTLIN_COMPILE or String, but was $it") }
+
+        tasksByPath
+            .filter { it isNotInstance getAbstractKotlinCompileFor(it) }
+            .forEach { throw IllegalArgumentException("Illegal task path in kotlinTasks, must be subtype of $ABSTRACT_KOTLIN_COMPILE, but was $it") }
+
+
+        return (tasksByPath + other) as List<Task>
+    }
+
+    private fun extractClasspathAndSourceRootsFromKotlinTasks(): ClasspathAndSourceRoots {
+
+        val allTasks = kotlinTasks
+
+        val allClasspath = mutableSetOf<File>()
+        var allClasspathFileCollection: FileCollection = project.files()
+        val allSourceRoots = mutableSetOf<File>()
+
+        allTasks.forEach {
+            logger.debug("Dokka found AbstractKotlinCompile task: $it")
+            with(ReflectDsl) {
+                val taskSourceRoots: List<File> = it["sourceRootsContainer"]["sourceRoots"].v()
+
+                val abstractKotlinCompileClz = getAbstractKotlinCompileFor(it)!!
+
+                val taskClasspath: Iterable<File> =
+                    (it["getClasspath", AbstractCompile::class].takeIfIsFunc()?.invoke()
+                            ?: it["compileClasspath", abstractKotlinCompileClz].takeIfIsProp()?.v()
+                            ?: it["getClasspath", abstractKotlinCompileClz]())
+
+                if (taskClasspath is FileCollection) {
+                    allClasspathFileCollection += taskClasspath
+                } else {
+                    allClasspath += taskClasspath
+                }
+                allSourceRoots += taskSourceRoots.filter { it.exists() }
+            }
+        }
+
+        return ClasspathAndSourceRoots(allClasspathFileCollection + project.files(allClasspath), allSourceRoots.toList())
+    }
+
+    private fun Iterable<File>.toSourceRoots(): List<GradleSourceRootImpl> = this.filter { it.exists() }.map { GradleSourceRootImpl().apply { path = it.path } }
+
+    protected open fun collectSuppressedFiles(sourceRoots: List<SourceRoot>): List<String> = emptyList()
+
+    @TaskAction
+    fun generate() {
+        if (dokkaRuntime == null){
+            dokkaRuntime = project.configurations.getByName("dokkaRuntime")
+        }
+
+        dokkaRuntime?.defaultDependencies{ dependencies -> dependencies.add(project.dependencies.create(dokkaFatJar)) }
+        val kotlinColorsEnabledBefore = System.getProperty(COLORS_ENABLED_PROPERTY) ?: "false"
+        System.setProperty(COLORS_ENABLED_PROPERTY, "false")
+        try {
+            loadFatJar()
+            // TODO: implement extracting source roots from kotlin tasks
+            val (_, tasksSourceRoots) = kotlinCompileBasedClasspathAndSourceRoots
+
+            val sourceRoots = collectSourceRoots() + tasksSourceRoots.toSourceRoots()
+
+            val bootstrapClass = ClassloaderContainer.fatJarClassLoader!!.loadClass("org.jetbrains.dokka.DokkaBootstrapImpl")
+            val bootstrapInstance = bootstrapClass.constructors.first().newInstance()
+            val bootstrapProxy: DokkaBootstrap =
+                automagicTypedProxy(javaClass.classLoader, bootstrapInstance)
+
+            val gson = GsonBuilder().setPrettyPrinting().create()
+
+            val passConfigurationExtension: GradlePassConfigurationImpl = extensions.findByName(
+                CONFIGURATION_EXTENSION_NAME) as GradlePassConfigurationImpl
+            val passConfigurationsContainer =
+                (extensions.getByName(MULTIPLATFORM_EXTENSION_NAME) as Iterable<GradlePassConfigurationImpl>).toList()
+
+            passConfigurationExtension.sourceRoots.addAll(sourceRoots)
+
+            val passConfigurationList =
+                (if (passConfigurationsContainer.isEmpty()) listOf(passConfigurationExtension) else passConfigurationsContainer)
+                    .map { defaultPassConfiguration(it) }
+
+            val configuration = GradleDokkaConfigurationImpl()
+            configuration.outputDir = outputDirectory
+            configuration.format = outputFormat
+            configuration.generateIndexPages = true
+            configuration.cacheRoot = cacheRoot
+            configuration.impliedPlatforms = impliedPlatforms
+            configuration.passesConfigurations = passConfigurationList
+
+            bootstrapProxy.configure(
+                BiConsumer { level, message ->
+                    when (level) {
+                        "info" -> logger.info(message)
+                        "warn" -> logger.warn(message)
+                        "error" -> logger.error(message)
+                    }
+                },
+                gson.toJson(configuration)
+            )
+
+            bootstrapProxy.generate()
+
+        } finally {
+            System.setProperty(COLORS_ENABLED_PROPERTY, kotlinColorsEnabledBefore)
+        }
+    }
+
+    private fun defaultPassConfiguration(passConfig: GradlePassConfigurationImpl): GradlePassConfigurationImpl{
+        val (tasksClasspath, _) = kotlinCompileBasedClasspathAndSourceRoots
+
+        val fullClasspath = tasksClasspath + classpath
+        passConfig.moduleName = moduleName
+        passConfig.classpath = fullClasspath.map { it.absolutePath }
+        passConfig.samples = passConfig.samples.map { project.file(it).absolutePath }
+        passConfig.includes = passConfig.includes.map { project.file(it).absolutePath }
+        passConfig.collectInheritedExtensionsFromLibraries = collectInheritedExtensionsFromLibraries
+        passConfig.suppressedFiles = collectSuppressedFiles(passConfig.sourceRoots)
+        passConfig.externalDocumentationLinks.addAll(externalDocumentationLinks)
+
+        return passConfig
+    }
+
+    private fun collectSourceRoots(): List<DokkaConfiguration.SourceRoot> {
+        val sourceDirs = when {
+            sourceDirs.any() -> {
+                logger.info("Dokka: Taking source directories provided by the user")
+                sourceDirs.toSet()
+            }
+            kotlinTasks.isEmpty() -> project.convention.findPlugin(JavaPluginConvention::class.java)?.let { javaPluginConvention ->
+                logger.info("Dokka: Taking source directories from default java plugin")
+                val sourceSets = javaPluginConvention.sourceSets.findByName(SourceSet.MAIN_SOURCE_SET_NAME)
+                sourceSets?.allSource?.srcDirs
+            }
+            else -> emptySet()
+        }
+
+        return sourceRoots + (sourceDirs?.toSourceRoots() ?: emptyList())
+    }
+
+    companion object {
+        const val COLORS_ENABLED_PROPERTY = "kotlin.colors.enabled"
+        const val ABSTRACT_KOTLIN_COMPILE = "org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile"
+
+        private fun getAbstractKotlinCompileFor(task: Task) = try {
+            task.project.buildscript.classLoader.loadClass(ABSTRACT_KOTLIN_COMPILE)
+        } catch (e: ClassNotFoundException) {
+            null
+        }
+    }
+}
diff --git a/runners/gradle-plugin/src/main/kotlin/ProxyUtils.kt b/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/ProxyUtils.kt
index 7bdf2f9d..f8965993 100644
--- a/runners/gradle-plugin/src/main/kotlin/ProxyUtils.kt
+++ b/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/ProxyUtils.kt
@@ -1,4 +1,4 @@
-package org.jetbrains.dokka
+package org.jetbrains.dokka.gradle
 
 import java.lang.reflect.InvocationHandler
 import java.lang.reflect.InvocationTargetException
@@ -26,9 +26,9 @@ inline fun <reified T : Any> automagicTypedProxy(targetClassLoader: ClassLoader,
  */
 fun automagicProxy(targetClassLoader: ClassLoader, targetType: Class<*>, delegate: Any): Any =
         Proxy.newProxyInstance(
-                targetClassLoader,
-                arrayOf(targetType),
-                DelegatedInvocationHandler(delegate)
+            targetClassLoader,
+            arrayOf(targetType),
+            DelegatedInvocationHandler(delegate)
         )
 
 class DelegatedInvocationHandler(private val delegate: Any) : InvocationHandler {
diff --git a/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/configurationImplementations.kt b/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/configurationImplementations.kt
new file mode 100644
index 00000000..56bfe262
--- /dev/null
+++ b/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/configurationImplementations.kt
@@ -0,0 +1,118 @@
+package org.jetbrains.dokka.gradle
+
+import groovy.lang.Closure
+import org.gradle.api.Action
+import org.gradle.util.ConfigureUtil
+import org.jetbrains.dokka.DokkaConfiguration
+import org.jetbrains.dokka.DokkaConfiguration.*
+import org.jetbrains.dokka.Platform
+import java.io.File
+import java.io.Serializable
+import java.net.URL
+
+class GradleSourceRootImpl: SourceRoot, Serializable {
+    override var path: String = ""
+        set(value) {
+            field = File(value).absolutePath
+        }
+
+    override fun toString(): String = path
+}
+
+open class GradlePassConfigurationImpl(@Transient val name: String = ""): PassConfiguration {
+    override var classpath: List<String> = emptyList()
+    override var moduleName: String = ""
+    override var sourceRoots: MutableList<SourceRoot> = mutableListOf()
+    override var samples: List<String> = emptyList()
+    override var includes: List<String> = emptyList()
+    override var includeNonPublic: Boolean = false
+    override var includeRootPackage: Boolean = false
+    override var reportUndocumented: Boolean = false
+    override var skipEmptyPackages: Boolean = false
+    override var skipDeprecated: Boolean = false
+    override var jdkVersion: Int = 6
+    override var sourceLinks: MutableList<SourceLinkDefinition> = mutableListOf()
+    override var perPackageOptions: MutableList<PackageOptions> = mutableListOf()
+    override var externalDocumentationLinks: MutableList<ExternalDocumentationLink> = mutableListOf()
+    override var languageVersion: String? = null
+    override var apiVersion: String? = null
+    override var noStdlibLink: Boolean = false
+    override var noJdkLink: Boolean = false
+    override var suppressedFiles: List<String> = emptyList()
+    override var collectInheritedExtensionsFromLibraries: Boolean = false
+    override var analysisPlatform: Platform = Platform.DEFAULT
+    override var targets: List<String> = listOf("JVM")
+    override var sinceKotlin: String = "1.0"
+
+    fun sourceRoot(c: Closure<Unit>) {
+        val configured = ConfigureUtil.configure(c, GradleSourceRootImpl())
+        sourceRoots.add(configured)
+    }
+
+    fun sourceRoot(action: Action<in GradleSourceRootImpl>) {
+        val sourceRoot = GradleSourceRootImpl()
+        action.execute(sourceRoot)
+        sourceRoots.add(sourceRoot)
+    }
+
+    fun sourceLink(c: Closure<Unit>) {
+        val configured = ConfigureUtil.configure(c, GradleSourceLinkDefinitionImpl())
+        sourceLinks.add(configured)
+    }
+
+    fun sourceLink(action: Action<in GradleSourceLinkDefinitionImpl>) {
+        val sourceLink = GradleSourceLinkDefinitionImpl()
+        action.execute(sourceLink)
+        sourceLinks.add(sourceLink)
+    }
+
+    fun perPackageOption(c: Closure<Unit>) {
+        val configured = ConfigureUtil.configure(c, GradlePackageOptionsImpl())
+        perPackageOptions.add(configured)
+    }
+
+    fun perPackageOption(action: Action<in GradlePackageOptionsImpl>) {
+        val option = GradlePackageOptionsImpl()
+        action.execute(option)
+        perPackageOptions.add(option)
+    }
+
+    fun externalDocumentationLink(c: Closure<Unit>) {
+        val link = ConfigureUtil.configure(c, GradleExternalDocumentationLinkImpl())
+        externalDocumentationLinks.add(link)
+    }
+
+    fun externalDocumentationLink(action: Action<in GradleExternalDocumentationLinkImpl>) {
+        val link = GradleExternalDocumentationLinkImpl()
+        action.execute(link)
+        externalDocumentationLinks.add(link)
+    }
+}
+
+class GradleSourceLinkDefinitionImpl : SourceLinkDefinition {
+    override var path: String = ""
+    override var url: String = ""
+    override var lineSuffix: String? = null
+}
+
+class GradleExternalDocumentationLinkImpl : ExternalDocumentationLink {
+    override var url: URL = URL("")
+    override var packageListUrl: URL = URL("")
+}
+
+class GradleDokkaConfigurationImpl: DokkaConfiguration {
+    override var outputDir: String = ""
+    override var format: String = "html"
+    override var generateIndexPages: Boolean = false
+    override var cacheRoot: String? = null
+    override var impliedPlatforms: List<String> = emptyList()
+    override var passesConfigurations: List<GradlePassConfigurationImpl> = emptyList()
+}
+
+class GradlePackageOptionsImpl: PackageOptions {
+    override var prefix: String = ""
+    override val includeNonPublic: Boolean = false
+    override val reportUndocumented: Boolean = true
+    override val skipDeprecated: Boolean = true
+    override val suppress: Boolean = false
+}
\ No newline at end of file
diff --git a/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/main.kt b/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/main.kt
new file mode 100644
index 00000000..d04ed5f0
--- /dev/null
+++ b/runners/gradle-plugin/src/main/kotlin/org/jetbrains/dokka/gradle/main.kt
@@ -0,0 +1,51 @@
+package org.jetbrains.dokka.gradle
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import java.io.File
+import java.io.InputStream
+import java.util.*
+
+/*
+* Extension names, which are used in a build.gradle file as closure names:
+* dokka {
+*     configuration { // extension name
+*
+*     }
+* }
+* */
+internal const val CONFIGURATION_EXTENSION_NAME = "configuration"
+internal const val MULTIPLATFORM_EXTENSION_NAME = "multiplatform"
+
+open class DokkaPlugin : Plugin<Project> {
+
+    override fun apply(project: Project) {
+        DokkaVersion.loadFrom(javaClass.getResourceAsStream("/META-INF/gradle-plugins/org.jetbrains.dokka.properties"))
+
+        project.tasks.create("dokka", DokkaTask::class.java).apply {
+            dokkaRuntime = project.configurations.create("dokkaRuntime")
+            moduleName = project.name
+            outputDirectory = File(project.buildDir, "dokka").absolutePath
+        }
+        project.tasks.withType(DokkaTask::class.java) { task ->
+            val passConfiguration = project.container(GradlePassConfigurationImpl::class.java)
+            task.extensions.add(MULTIPLATFORM_EXTENSION_NAME, passConfiguration)
+            task.extensions.create(CONFIGURATION_EXTENSION_NAME, GradlePassConfigurationImpl::class.java, "")
+        }
+    }
+}
+
+object DokkaVersion {
+    var version: String? = null
+
+    fun loadFrom(stream: InputStream) {
+        version = Properties().apply {
+            load(stream)
+        }.getProperty("dokka-version")
+    }
+}
+
+object ClassloaderContainer {
+    @JvmField
+    var fatJarClassLoader: ClassLoader? = null
+}
\ No newline at end of file