added renderDependencies task

sample/groovy/build.gradle

@@ -23,6 +23,10 @@ exportDependencies {
     configurationName = 'runtime'
 }
 
+renderDependencies {
+    format = "svg"
+}
+
 dependencies {
     runtime("org.hibernate:hibernate-core:5.4.13.Final")
 }

sample/kotlin/build.gradle.kts

@@ -9,7 +9,8 @@ buildscript {
     }
 }
 
-import net.woggioni.plugins.DependencyExportPluginExtension
+import net.woggioni.plugins.ExportDependenciesPluginExtension
+import net.woggioni.plugins.RenderDependenciesPluginExtension
 
 plugins {
     kotlin("jvm") version "1.3.71"
@@ -25,6 +26,10 @@ dependencies {
     runtime("org.hibernate:hibernate-core:5.4.13.Final")
 }
 
-configure<DependencyExportPluginExtension> {
+configure<ExportDependenciesPluginExtension> {
     configurationName = "runtime"
 }
+
+configure<RenderDependenciesPluginExtension> {
+    format = "svg"
+}

src/main/kotlin/net/woggioni/plugins/DependencyExportPlugin.kt

@@ -3,6 +3,7 @@
  */
 package net.woggioni.plugins
 
+import org.gradle.api.GradleException
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.artifacts.component.ModuleComponentIdentifier
@@ -13,26 +14,63 @@ import org.gradle.api.artifacts.result.UnresolvedDependencyResult
 import java.io.BufferedWriter
 import java.io.OutputStreamWriter
 import java.nio.file.Files
+import java.nio.file.Path
+import java.nio.file.Paths
+import kotlin.reflect.KMutableProperty0
 
-open class DependencyExportPluginExtension {
+
+open class ExportDependenciesPluginExtension(project: Project) {
     var configurationName: String = "default"
+    var outputFile = project.buildDir.toPath().resolve("dependencies.dot")
+}
+
+open class RenderDependenciesPluginExtension(project: Project) {
+    var format: String = "xlib"
+    var outputFile = project.buildDir.toPath().resolve("renderedDependencies")
+    var graphvizExecutable: String = "dot"
+}
+
+private class Overrider(private val properties : Map<String, Any?>, private val prefix: String) {
+    inline fun <reified T> identity(arg: T): T {
+        return arg
+    }
+
+    fun overrideProperty(
+            property: KMutableProperty0<String>) {
+        overrideProperty(property, ::identity)
+    }
+
+    inline fun <reified V> overrideProperty(
+            property: KMutableProperty0<V>,
+            valueFactory: (String) -> V) {
+        val propertyKey = prefix + "." + property.name
+        val propertyValue = properties[propertyKey] as String?
+        if (propertyValue != null) {
+            property.set(valueFactory(propertyValue))
+        }
+    }
 }
 
 object DependencyExporter {
 
-    fun graphviz(project: Project, configurationName : String) {
+    fun exportDot(project: Project, ext: ExportDependenciesPluginExtension) {
+        val overrider = Overrider(project.properties, "exportDependencies")
+        overrider.overrideProperty(ext::configurationName)
+        overrider.overrideProperty(ext::outputFile) { value -> Paths.get(value) }
+
         var sequence = 0
         val map = HashMap<ResolvedComponentResult, Int>()
+
         val resolutionResult = project.configurations.single {
-            it.name == configurationName
+            it.name == ext.configurationName
         }.incoming.resolutionResult
-        project.buildDir.toPath().let {
-            Files.createDirectories(it)
-        }.let {
+        if(!ext.outputFile.isAbsolute) {
+            ext.outputFile = project.buildDir.toPath().resolve(ext.outputFile)
+        }
+        Files.createDirectories(ext.outputFile.parent)
         BufferedWriter(
                 OutputStreamWriter(
-                            Files.newOutputStream(project.buildDir.toPath().resolve("dependencies.dot"))))
-        }.use { writer ->
+                        Files.newOutputStream(ext.outputFile))).use { writer ->
             writer.write("digraph G {")
             writer.newLine()
             writer.write("    #rankdir=\"LR\";")
@@ -83,17 +121,47 @@ object DependencyExporter {
     }
 }
 
+object DependencyRenderer {
+    fun render(project: Project, ext: RenderDependenciesPluginExtension, sourceFile : Path) {
+        val overrider = Overrider(project.properties, "renderDependencies")
+        overrider.overrideProperty(ext::format)
+        overrider.overrideProperty(ext::graphvizExecutable)
+        overrider.overrideProperty(ext::outputFile) { value -> Paths.get(value) }
+
+        if(!ext.outputFile.isAbsolute) {
+            ext.outputFile = project.buildDir.toPath().resolve(ext.outputFile)
+        }
+        val cmd: List<String> = listOf(
+                ext.graphvizExecutable,
+                "-T${ext.format}",
+                "-o${ext.outputFile}",
+                sourceFile.toString()
+
+        )
+        val returnCode = ProcessBuilder(cmd).inheritIO().start().waitFor()
+        if (returnCode != 0) {
+            throw GradleException("Error invoking graphviz")
+        }
+    }
+}
+
 class DependencyExportPlugin : Plugin<Project> {
     override fun apply(project: Project) {
-        val extension = DependencyExportPluginExtension()
-        project.extensions.add(DependencyExportPluginExtension::class.java, "exportDependencies", extension)
-        project.tasks.register("exportDependencies") {
+        val dependencyExportExtension = ExportDependenciesPluginExtension(project)
+        project.extensions.add(ExportDependenciesPluginExtension::class.java, "exportDependencies", dependencyExportExtension)
+        val exportDependenciesTask = project.tasks.register("exportDependencies") {
             it.doLast {
-                val propertyKey = "exportDependencies.configurationName"
-                val properties = project.properties
-                val configurationName = properties.getOrDefault(propertyKey, extension.configurationName) as String
-                DependencyExporter.graphviz(project, configurationName = configurationName)
-            }
-        }
+                DependencyExporter.exportDot(project, dependencyExportExtension)
+            }
+        }.get()
+
+        val renderDependenciesPluginExtension = RenderDependenciesPluginExtension(project)
+        project.extensions.add(RenderDependenciesPluginExtension::class.java, "renderDependencies", renderDependenciesPluginExtension)
+        val renderDependenciesTask = project.tasks.register("renderDependencies") {
+            it.dependsOn(exportDependenciesTask)
+            it.doLast {
+                DependencyRenderer.render(project, renderDependenciesPluginExtension, dependencyExportExtension.outputFile)
+            }
+        }.get()
     }
 }