package mill.define
import mill.define.Applicative.Applyable
import mill.eval.{PathRef, Result}
import upickle.default.{ReadWriter => RW, Reader => R, Writer => W}
import scala.language.experimental.macros
import scala.reflect.macros.blackbox.Context
/**
* Models a single node in the Mill build graph, with a list of inputs and a
* single output of type [[T]].
*
* Generally not instantiated manually, but instead constructed via the
* [[Target.apply]] & similar macros.
*/
abstract class Task[+T] extends Task.Ops[T] with Applyable[Task, T]{
/**
* What other Targets does this Target depend on?
*/
val inputs: Seq[Task[_]]
/**
* Evaluate this target
*/
def evaluate(args: mill.util.Ctx): Result[T]
/**
* Even if this target's inputs did not change, does it need to re-evaluate
* anyway?
*/
def sideHash: Int = 0
def flushDest: Boolean = true
def asTarget: Option[Target[T]] = None
def asCommand: Option[Command[T]] = None
def asPersistent: Option[Persistent[T]] = None
def asWorker: Option[Worker[T]] = None
def self = this
}
trait NamedTask[+T] extends Task[T]{
def ctx: mill.define.Ctx
def label = ctx.segment match{case Segment.Label(v) => v}
override def toString = ctx.segments.render
}
trait Target[+T] extends NamedTask[T]{
override def asTarget = Some(this)
def readWrite: RW[_]
}
object Target extends TargetGenerated with Applicative.Applyer[Task, Task, Result, mill.util.Ctx] {
implicit def apply[T](t: T)
(implicit r: R[T],
w: W[T],
ctx: mill.define.Ctx): Target[T] = macro targetImpl[T]
def targetImpl[T: c.WeakTypeTag](c: Context)
(t: c.Expr[T])
(r: c.Expr[R[T]],
w: c.Expr[W[T]],
ctx: c.Expr[mill.define.Ctx]): c.Expr[Target[T]] = {
import c.universe._
val lhs = Applicative.impl0[Task, T, mill.util.Ctx](c)(reify(Result.Success(t.splice)).tree)
mill.moduledefs.Cacher.impl0[TargetImpl[T]](c)(
reify(
new TargetImpl[T](lhs.splice, ctx.splice, RW(w.splice.write, r.splice.read))
)
)
}
implicit def apply[T](t: Result[T])
(implicit r: R[T],
w: W[T],
ctx: mill.define.Ctx): Target[T] = macro targetResultImpl[T]
def targetResultImpl[T: c.WeakTypeTag](c: Context)
(t: c.Expr[Result[T]])
(r: c.Expr[R[T]],
w: c.Expr[W[T]],
ctx: c.Expr[mill.define.Ctx]): c.Expr[Target[T]] = {
import c.universe._
mill.moduledefs.Cacher.impl0[Target[T]](c)(
reify(
new TargetImpl[T](
Applicative.impl0[Task, T, mill.util.Ctx](c)(t.tree).splice,
ctx.splice,
RW(w.splice.write, r.splice.read)
)
)
)
}
def apply[T](t: Task[T])
(implicit r: R[T],
w: W[T],
ctx: mill.define.Ctx): Target[T] = macro targetTaskImpl[T]
def targetTaskImpl[T: c.WeakTypeTag](c: Context)
(t: c.Expr[Task[T]])
(r: c.Expr[R[T]],
w: c.Expr[W[T]],
ctx: c.Expr[mill.define.Ctx]): c.Expr[Target[T]] = {
import c.universe._
mill.moduledefs.Cacher.impl0[Target[T]](c)(
reify(
new TargetImpl[T](t.splice, ctx.splice, RW(w.splice.write, r.splice.read))
)
)
}
def source(value: Result[ammonite.ops.Path])
(implicit r: R[PathRef],
w: W[PathRef],
ctx: mill.define.Ctx): Input[PathRef] = macro sourceImpl
def sourceImpl(c: Context)
(value: c.Expr[Result[ammonite.ops.Path]])
(r: c.Expr[R[PathRef]],
w: c.Expr[W[PathRef]],
ctx: c.Expr[mill.define.Ctx]): c.Expr[Input[PathRef]] = {
import c.universe._
val wrapped: c.Expr[Result[PathRef]] = reify(value.splice match{
case Result.Success(p) => Result.Success(PathRef(p))
case x: Result.Failing => x
})
mill.moduledefs.Cacher.impl0[Input[PathRef]](c)(
reify(
new Input[PathRef](
Applicative.impl0[Task, PathRef, mill.util.Ctx](c)(wrapped.tree).splice,
ctx.splice,
RW(w.splice.write, r.splice.read),
)
)
)
}
def input[T](value: Result[T])
(implicit r: R[T],
w: W[T],
ctx: mill.define.Ctx): Input[T] = macro inputImpl[T]
def inputImpl[T: c.WeakTypeTag](c: Context)
(value: c.Expr[T])
(r: c.Expr[R[T]],
w: c.Expr[W[T]],
ctx: c.Expr[mill.define.Ctx]): c.Expr[Input[T]] = {
import c.universe._
mill.moduledefs.Cacher.impl0[Input[T]](c)(
reify(
new Input[T](
Applicative.impl[Task, T, mill.util.Ctx](c)(value).splice,
ctx.splice,
RW(w.splice.write, r.splice.read)
)
)
)
}
def command[T](t: Task[T])
(implicit ctx: mill.define.Ctx,
w: W[T]): Command[T] = new Command(t, ctx, w)
def command[T](t: Result[T])
(implicit w: W[T],
ctx: mill.define.Ctx): Command[T] = macro commandImpl[T]
def commandImpl[T: c.WeakTypeTag](c: Context)
(t: c.Expr[T])
(w: c.Expr[W[T]],
ctx: c.Expr[mill.define.Ctx]): c.Expr[Command[T]] = {
import c.universe._
reify(
new Command[T](Applicative.impl[Task, T, mill.util.Ctx](c)(t).splice, ctx.splice, w.splice)
)
}
def worker[T](t: Task[T])
(implicit ctx: mill.define.Ctx): Worker[T] = new Worker(t, ctx)
def worker[T](t: Result[T])
(implicit ctx: mill.define.Ctx): Worker[T] = macro workerImpl[T]
def workerImpl[T: c.WeakTypeTag](c: Context)
(t: c.Expr[T])
(ctx: c.Expr[mill.define.Ctx]): c.Expr[Worker[T]] = {
import c.universe._
reify(
new Worker[T](Applicative.impl[Task, T, mill.util.Ctx](c)(t).splice, ctx.splice)
)
}
def task[T](t: Result[T]): Task[T] = macro Applicative.impl[Task, T, mill.util.Ctx]
def persistent[T](t: Result[T])(implicit r: R[T],
w: W[T],
ctx: mill.define.Ctx): Target[T] = macro persistentImpl[T]
def persistentImpl[T: c.WeakTypeTag](c: Context)
(t: c.Expr[T])
(r: c.Expr[R[T]],
w: c.Expr[W[T]],
ctx: c.Expr[mill.define.Ctx]): c.Expr[Persistent[T]] = {
import c.universe._
mill.moduledefs.Cacher.impl0[Persistent[T]](c)(
reify(
new Persistent[T](
Applicative.impl[Task, T, mill.util.Ctx](c)(t).splice,
ctx.splice,
RW(w.splice.write, r.splice.read)
)
)
)
}
type TT[+X] = Task[X]
def makeT[X](inputs0: Seq[TT[_]], evaluate0: mill.util.Ctx => Result[X]) = new Task[X] {
val inputs = inputs0
def evaluate(x: mill.util.Ctx) = evaluate0(x)
}
def underlying[A](v: Task[A]) = v
def mapCtx[A, B](t: Task[A])(f: (A, mill.util.Ctx) => Result[B]) = t.mapDest(f)
def zip() = new Task.Task0(())
def zip[A](a: Task[A]) = a.map(Tuple1(_))
def zip[A, B](a: Task[A], b: Task[B]) = a.zip(b)
}
case class Caller[A](value: A)
object Caller {
def apply[T]()(implicit c: Caller[T]) = c.value
implicit def generate[T]: Caller[T] = macro impl[T]
def impl[T: c.WeakTypeTag](c: Context): c.Tree = {
import c.universe._
q"new _root_.mill.define.Caller[${weakTypeOf[T]}](this)"
}
}
abstract class NamedTaskImpl[+T](ctx0: mill.define.Ctx, t: Task[T]) extends NamedTask[T]{
def evaluate(args: mill.util.Ctx) = args[T](0)
val ctx = ctx0.copy(segments = ctx0.segments ++ Seq(ctx0.segment))
val inputs = Seq(t)
}
class TargetImpl[+T](t: Task[T],
ctx0: mill.define.Ctx,
val readWrite: RW[_]) extends NamedTaskImpl[T](ctx0, t) with Target[T] {
}
class Command[+T](t: Task[T],
ctx0: mill.define.Ctx,
val writer: W[_]) extends NamedTaskImpl[T](ctx0, t) {
override def asCommand = Some(this)
}
class Worker[+T](t: Task[T], ctx0: mill.define.Ctx) extends NamedTaskImpl[T](ctx0, t) {
override def asWorker = Some(this)
}
class Persistent[+T](t: Task[T],
ctx0: mill.define.Ctx,
readWrite: RW[_])
extends TargetImpl[T](t, ctx0, readWrite) {
override def flushDest = false
override def asPersistent = Some(this)
}
class Input[T](t: Task[T],
ctx0: mill.define.Ctx,
val readWrite: RW[_]) extends NamedTaskImpl[T](ctx0, t) with Target[T]{
override def sideHash = util.Random.nextInt()
}
object Task {
class Task0[T](t: T) extends Task[T]{
lazy val t0 = t
val inputs = Nil
def evaluate(args: mill.util.Ctx) = t0
}
abstract class Ops[+T]{ this: Task[T] =>
def map[V](f: T => V) = new Task.Mapped(this, f)
def mapDest[V](f: (T, mill.util.Ctx) => Result[V]) = new Task.MappedDest(this, f)
def filter(f: T => Boolean) = this
def withFilter(f: T => Boolean) = this
def zip[V](other: Task[V]) = new Task.Zipped(this, other)
}
def traverse[T, V](source: Seq[T])(f: T => Task[V]) = {
new Sequence[V](source.map(f))
}
def sequence[T](source: Seq[Task[T]]) = new Sequence[T](source)
class Sequence[+T](inputs0: Seq[Task[T]]) extends Task[Seq[T]]{
val inputs = inputs0
def evaluate(args: mill.util.Ctx) = {
for (i <- 0 until args.length)
yield args(i).asInstanceOf[T]
}
}
class Mapped[+T, +V](source: Task[T], f: T => V) extends Task[V]{
def evaluate(args: mill.util.Ctx) = f(args(0))
val inputs = List(source)
}
class MappedDest[+T, +V](source: Task[T], f: (T, mill.util.Ctx) => Result[V]) extends Task[V]{
def evaluate(args: mill.util.Ctx) = f(args(0), args)
val inputs = List(source)
}
class Zipped[+T, +V](source1: Task[T], source2: Task[V]) extends Task[(T, V)]{
def evaluate(args: mill.util.Ctx) = (args(0), args(1))
val inputs = List(source1, source2)
}
}