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package hbt
import java.io.InputStreamReader
import java.nio.{file => jnio}
import sourcecode.Enclosing
trait Target[T]{
val label: String
val inputs: Seq[Target[_]]
def evaluate(args: Args): T
def map[V](f: T => V)(implicit path: Enclosing) = {
Target.Mapped(this, f, path.value)
}
def zip[V](other: Target[V])(implicit path: Enclosing) = {
Target.Zipped(this, other, path.value)
}
def ~[V, R](other: Target[V])
(implicit s: Implicits.Sequencer[T, V, R]): Target[R] = {
this.zip(other).map(s.apply _ tupled)
}
}
object Target{
def traverse[T](source: Seq[Target[T]])(implicit path: Enclosing) = {
Traverse[T](source, path.value)
}
case class Traverse[T](inputs: Seq[Target[T]], label: String) extends Target[Seq[T]]{
def evaluate(args: Args) = {
for (i <- 0 until args.length)
yield args(i).asInstanceOf[T]
}
}
case class Mapped[T, V](source: Target[T], f: T => V,
label: String) extends Target[V]{
def evaluate(args: Args) = f(args(0))
val inputs = List(source)
}
case class Zipped[T, V](source1: Target[T],
source2: Target[V],
label: String) extends Target[(T, V)]{
def evaluate(args: Args) = (args(0), args(0))
val inputs = List(source1, source1)
}
def path(path: jnio.Path)(implicit label: Enclosing) = Path(path, label.value)
case class Path(path: jnio.Path, label: String) extends Target[jnio.Path]{
def evaluate(args: Args) = path
val inputs = Nil
}
case class Subprocess(inputs: Seq[Target[_]],
command: Args => Seq[String],
label: String) extends Target[Subprocess.Result] {
def evaluate(args: Args) = {
jnio.Files.createDirectories(args.dest)
import ammonite.ops._
implicit val path = ammonite.ops.Path(args.dest, pwd)
val output = %%(command(args))
assert(output.exitCode == 0)
Subprocess.Result(output, args.dest)
}
}
object Subprocess{
case class Result(result: ammonite.ops.CommandResult, dest: jnio.Path)
}
}
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