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package forge
import ammonite.ops.{ls, mkdir}
import play.api.libs.json.{Format, JsValue, Json}
abstract class Target[T](implicit formatter: Format[T]) extends Target.Ops[T]{
/**
* What other Targets does this Target depend on?
*/
val inputs: Seq[Target[_]]
/**
* Evaluate this target
*/
def evaluate(args: Args): T
/**
* Even if this target's inputs did not change, does it need to re-evaluate
* anyway?
*/
def externalHash: Int = 0
}
object Target{
abstract class Ops[T](implicit val formatter: Format[T]){ this: Target[T] =>
def evaluateAndWrite(args: Args): (T, JsValue) = {
val res = evaluate(args)
val str = formatter.writes(res)
(res, str)
}
def map[V: Format](f: T => V) = {
new Target.Mapped(this, f)
}
def zip[V: Format](other: Target[V]) = {
new Target.Zipped(this, other)
}
def ~[V: Format, R: Format](other: Target[V])
(implicit s: Implicits.Sequencer[T, V, R]): Target[R] = {
this.zip(other).map(s.apply _ tupled)
}
}
def test(inputs: Target[Int]*) = {
new Test(inputs, pure = inputs.nonEmpty)
}
/**
* A dummy target that takes any number of inputs, and whose output can be
* controlled externally, so you can construct arbitrary dataflow graphs and
* test how changes propagate.
*/
class Test(val inputs: Seq[Target[Int]],
val pure: Boolean) extends Target[Int]{
var counter = 0
def evaluate(args: Args) = {
counter + args.args.map(_.asInstanceOf[Int]).sum
}
override def externalHash = counter
}
def traverse[T: Format](source: Seq[Target[T]]) = {
new Traverse[T](source)
}
class Traverse[T: Format](val inputs: Seq[Target[T]]) extends Target[Seq[T]]{
def evaluate(args: Args) = {
for (i <- 0 until args.length)
yield args(i).asInstanceOf[T]
}
}
class Mapped[T, V: Format](source: Target[T], f: T => V) extends Target[V]{
def evaluate(args: Args) = f(args(0))
val inputs = List(source)
}
class Zipped[T: Format, V: Format](source1: Target[T],
source2: Target[V]) extends Target[(T, V)]{
def evaluate(args: Args) = (args(0), args(0))
val inputs = List(source1, source1)
}
def path(path: ammonite.ops.Path) = new Path(path)
class Path(path: ammonite.ops.Path) extends Target[ammonite.ops.Path]{
def evaluate(args: Args) = path
val inputs = Nil
override def externalHash = ls.rec(path).map(x => (x.toString, x.mtime)).hashCode()
}
class Subprocess(val inputs: Seq[Target[_]],
command: Args => Seq[String]) extends Target[Subprocess.Result] {
def evaluate(args: Args) = {
mkdir(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: ammonite.ops.Path)
}
}
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