1 files changed, 37 insertions, 0 deletions
diff --git a/project/Jni.scala b/project/Jni.scala
new file mode 100644
index 0000000..0263786
--- /dev/null
+++ b/project/Jni.scala
@@ -0,0 +1,37 @@
+import sbt._
+import Keys._
+import com.github.jodersky.build.NativeKeys._
+
+object Jni {
+  val jdkHome = settingKey[File]("Home of JDK.")
+  val javahHeaderDirectory = settingKey[File]("Directory where generated javah header files are placed.")
+  val javahClasses = settingKey[Seq[String]]("Fully qualified names of classes containing native declarations.")
+  val javah = taskKey[Seq[File]]("Generate JNI headers.")
+
+  val defaultSettings: Seq[Setting[_]] = Seq(
+    jdkHome := file(sys.env("JAVA_HOME")),
+    javahHeaderDirectory := (sourceManaged in Native).value / "javah",
+    javah := {
+    
+      val cp = (fullClasspath in Compile).value.map(_.data.getAbsolutePath).mkString(":")
+      for (clazz <- javahClasses.value) {
+        val parts = Seq(
+          "javah",
+          "-d", javahHeaderDirectory.value,
+          "-classpath", cp,
+          clazz)
+        val cmd = parts.mkString(" ")
+        val ev = Process(cmd) ! streams.value.log
+        if (ev != 0) throw new RuntimeException("Error occured running javah.")
+      }
+      IO.listFiles(javahHeaderDirectory.value)
+     },
+     sourceGenerators in Native <+= javah map {headers =>
+       headers
+     },
+     includeDirectories in Native += javahHeaderDirectory.value,
+     javah <<= (javah dependsOn (compile in Compile)),
+     includeDirectories in Native += jdkHome.value / "include"
+  )
+}
+