Add support for native dependencies.

src/main/kotlin/com/beust/kobalt/plugin/application/ApplicationPlugin.kt

@@ -36,7 +36,7 @@ fun Project.application(init: ApplicationConfig.() -> Unit) {
 
 @Singleton
 class ApplicationPlugin @Inject constructor(val configActor: ConfigActor<ApplicationConfig>,
-                                            val executors: KobaltExecutors,
+        val executors: KobaltExecutors, val nativeManager: NativeManager,
         val dependencyManager: DependencyManager, val taskContributor : TaskContributor)
             : BasePlugin(), IRunnerContributor, ITaskContributor, IConfigActor<ApplicationConfig> by configActor {
 
@@ -84,6 +84,9 @@ class ApplicationPlugin @Inject constructor(val configActor: ConfigActor<Applica
 
     override fun run(project: Project, context: KobaltContext, classpath: List<IClasspathDependency>): TaskResult {
         var result = TaskResult()
+        if (project.nativeDependencies.any()) {
+            nativeManager.installLibraries(project)
+        }
         configurationFor(project)?.let { config ->
             if (config.mainClass != null) {
                 result = runJarFile(project, context, config)
@@ -113,7 +116,11 @@ class ApplicationPlugin @Inject constructor(val configActor: ConfigActor<Applica
             allDeps.addAll(allTheDependencies)
         }
         val allDepsJoined = allDeps.joinToString(File.pathSeparator)
-        val args = listOf("-classpath", allDepsJoined) + config.jvmArgs + config.mainClass!!
+        val initialArgs = listOf("-classpath", allDepsJoined) + config.jvmArgs + config.mainClass!!
+        val contributorFlags = context.pluginInfo.jvmFlagContributors.flatMap {
+            it.jvmFlagsFor(project, context, initialArgs)
+        }
+        val args = contributorFlags + initialArgs
         val exitCode = RunCommand(java.absolutePath).run(args,
                 successCallback = { output: List<String> ->
                     println(output.joinToString("\n"))

src/main/kotlin/com/beust/kobalt/plugin/application/NativeManager.kt

@@ -0,0 +1,36 @@
+package com.beust.kobalt.plugin.application
+
+import com.beust.kobalt.api.IJvmFlagContributor
+import com.beust.kobalt.api.KobaltContext
+import com.beust.kobalt.api.Project
+import com.beust.kobalt.misc.JarUtils
+import com.beust.kobalt.misc.KFiles
+import com.beust.kobalt.misc.log
+import com.google.inject.Inject
+import java.io.File
+
+/**
+ * Used for projects that define native() dependencies. This class extracts the native jar files in the
+ * $build/native library and configures -Djava.library.path with that directory.
+ */
+class NativeManager @Inject constructor() : IJvmFlagContributor {
+    fun buildDir(project: Project) = File(KFiles.nativeBuildDir(project))
+
+    override fun jvmFlagsFor(project: Project, context: KobaltContext, currentFlags: List<String>): List<String> {
+        return if (project.nativeDependencies.any()) listOf("-Djava.library.path=${buildDir(project)}")
+            else emptyList()
+    }
+
+    fun installLibraries(project: Project) {
+        val buildDir = buildDir(project)
+        if (! buildDir.exists()) {
+            buildDir.mkdirs()
+            project.nativeDependencies.forEach { dep ->
+                log(2, "Extracting $dep " + dep.jarFile.get() + " in $buildDir")
+                JarUtils.extractJarFile(dep.jarFile.get(), buildDir)
+            }
+        } else {
+            log(2, "Native directory $buildDir already exists, not extracting the native jar files")
+        }
+    }
+}

src/main/resources/META-INF/kobalt-core-plugin.xml

@@ -6,6 +6,7 @@
         <!-- are found to implement one of IPluginActor's interfaces, they are added as such -->
         <class-name>com.beust.kobalt.plugin.java.JavaPlugin</class-name>
         <class-name>com.beust.kobalt.plugin.application.ApplicationPlugin</class-name>
+        <class-name>com.beust.kobalt.plugin.application.NativeManager</class-name>
         <class-name>com.beust.kobalt.plugin.KobaltPlugin</class-name>
         <class-name>com.beust.kobalt.plugin.kotlin.KotlinPlugin</class-name>
         <class-name>com.beust.kobalt.plugin.packaging.PackagingPlugin</class-name>