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package mill.util
import ammonite.ops.Path
import mill.define.Applicative.ImplicitStub
import mill.util.Ctx.{ArgCtx, DestCtx, LoaderCtx, LogCtx}
import scala.annotation.compileTimeOnly
import scala.language.implicitConversions
object Ctx{
@compileTimeOnly("Target.ctx() can only be used with a T{...} block")
@ImplicitStub
implicit def taskCtx: Ctx = ???
object DestCtx {
implicit def pathToCtx(path: Path): DestCtx =
new DestCtx { def dest: Path = path }
}
trait DestCtx{
def dest: Path
}
trait LogCtx{
def log: Logger
}
trait ArgCtx{
def args: IndexedSeq[_]
}
trait LoaderCtx{
def load[T](x: Loader[T]): T
}
trait Loader[T]{
def make(): T
}
}
class Ctx(val args: IndexedSeq[_],
val dest: Path,
val log: Logger,
workerCtx0: Ctx.LoaderCtx) extends DestCtx with LogCtx with ArgCtx with LoaderCtx{
def load[T](x: Ctx.Loader[T]): T = workerCtx0.load(x)
def length = args.length
def apply[T](index: Int): T = {
if (index >= 0 && index < args.length) args(index).asInstanceOf[T]
else throw new IndexOutOfBoundsException(s"Index $index outside of range 0 - ${args.length}")
}
}
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