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package ch.jodersky.sbt.jni
package plugins
import sbt._
import sbt.Keys._
import util.BytecodeUtil
/** 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 := {
val compiled: inc.Analysis = (compile in Compile).value
val classFiles: Set[File] = compiled.relations.allProducts.toSet
val nativeClasses = classFiles flatMap { file =>
BytecodeUtil.nativeClasses(file)
}
nativeClasses
},
target in javah := target.value / "native" / "include",
javah := {
val out = (target in javah).value
val jcp: Seq[File] = { (compile in Compile).value; Seq((classDirectory in Compile).value) }
val cp = jcp.mkString(sys.props("path.separator"))
val log = streams.value.log
val classes = (javahClasses in javah).value
if (!classes.isEmpty) {
log.info("Headers will be generated to " + out.getAbsolutePath)
}
for (clazz <- classes) {
log.info("Generating header for " + clazz)
val parts = Seq(
"javah",
"-d", out.getAbsolutePath,
"-classpath", cp,
clazz
)
val cmd = parts.mkString(" ")
val ev = Process(cmd) ! streams.value.log
if (ev != 0) sys.error(s"Error occured running javah. Exit code: ${ev}")
}
out
}
)
override lazy val projectSettings = mainSettings
}
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