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package ch.jodersky.sbt.jni
package plugins
import java.nio.file.{Path, Paths}
import collection.JavaConverters._
import util.BytecodeUtil
import java.util
import sbt._
import sbt.Keys._
/** Adds `javah` header-generation functionality to projects. */
object JniJavah extends AutoPlugin {
override def requires = plugins.JvmPlugin
override def trigger = allRequirements
object autoImport {
val javahClasses = taskKey[Set[String]](
"Finds fully qualified names of classes containing native declarations."
)
val javah = taskKey[File](
"Generate JNI headers. Returns the directory containing generated headers."
)
}
import autoImport._
lazy val mainSettings: Seq[Setting[_]] = Seq(
javahClasses in javah := {
import xsbti.compile._
val compiled: CompileAnalysis = (compile in Compile).value
val classFiles: Set[File] = compiled.readStamps().getAllProductStamps()
.asScala.keySet.toSet
val nativeClasses = classFiles flatMap { file =>
BytecodeUtil.nativeClasses(file)
}
nativeClasses
},
target in javah := target.value / "native" / "include",
javah := {
val out = (target in javah).value
// fullClasspath can't be used here since it also generates resources. In
// a project combining JniJavah and JniPackage, we would have a chicken-and-egg
// problem.
val jcp: Seq[File] = (dependencyClasspath in Compile).value.map(_.data) ++ {
(compile in Compile).value; Seq((classDirectory in Compile).value)
}
val log = streams.value.log
val classes = (javahClasses in javah).value
if (classes.nonEmpty) {
log.info("Headers will be generated to " + out.getAbsolutePath)
}
import scala.collection.JavaConverters._
ch.jodersky.sbt.jni.javah.HeaderGenerator.run(new util.ArrayList[String](classes.asJava),
Paths.get(out.getAbsolutePath), new util.ArrayList[Path](jcp.map(_.toPath).asJava)
)
out
}
)
override lazy val projectSettings = mainSettings
}
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