Implement input task helper Def.input

main-settings/src/main/scala/sbt/Def.scala

@@ -234,6 +234,9 @@ object Def extends Init[Scope] with TaskMacroExtra with InitializeImplicits:
 
   // def settingDyn[T](t: Def.Initialize[T]): Def.Initialize[T] = macro settingDynMacroImpl[T]
 
+  inline def input[A1](inline p: State => Parser[A1]): ParserGen[A1] =
+    ${ SettingMacro.inputMacroImpl[A1]('p) }
+
   inline def inputTask[A1](inline a: A1): Def.Initialize[InputTask[A1]] =
     ${ InputTaskMacro.inputTaskMacroImpl[A1]('a) }
 

main-settings/src/main/scala/sbt/InputTask.scala

@@ -13,6 +13,7 @@ import std.TaskExtra._
 import sbt.internal.util.{ ~>, AttributeKey, Types }
 import sbt.internal.util.Types._
 import sbt.internal.util.Util._
+import sbt.util.Applicative
 
 /** Parses input and produces a task to run.  Constructed using the companion object. */
 final class InputTask[A1] private (val parser: State => Parser[Task[A1]]):
@@ -86,13 +87,14 @@ object InputTask:
   )(action: Initialize[A1 => Task[A2]]): Initialize[InputTask[A2]] =
     p.zipWith(action)((parser, act) => free(parser)(act))
 
-  /*
   /** Constructs an InputTask that accepts no user input. */
   def createFree[T](action: Initialize[Task[T]]): Initialize[InputTask[T]] =
     action { tsk =>
       free(emptyParser)(const(tsk))
     }
-   */
+
+  def createFreeFromAction[A1](a: () => A1): InputTask[A1] =
+    free(emptyParser)(_ => Task.taskMonad.pure(a))
 
   /**
    * Constructs an InputTask from:
@@ -104,11 +106,11 @@ object InputTask:
   )(action: Initialize[Task[A1 => Initialize[Task[A2]]]]): Initialize[InputTask[A2]] =
     separate(p)(std.FullInstance.flattenFun[A1, A2](action))
 
-  /*
   /** A dummy parser that consumes no input and produces nothing useful (unit). */
   def emptyParser: State => Parser[Unit] =
     Types.const(sbt.internal.util.complete.DefaultParsers.success(()))
 
+  /*
   /** Implementation detail that is public because it is used by a macro. */
   def parserAsInput[T](p: Parser[T]): Initialize[State => Parser[T]] =
     Def.valueStrict(Types.const(p))
@@ -181,4 +183,28 @@ object InputTask:
     f(task)
   }
    */
+
+  given inputTaskApplicative: Applicative[InputTask] with
+    type F[a] = InputTask[a]
+    override def pure[A1](a: () => A1): InputTask[A1] = InputTask.createFreeFromAction(a)
+    override def ap[A1, A2](ff: InputTask[A1 => A2])(in: InputTask[A1]): InputTask[A2] =
+      InputTask[A2]((s: State) =>
+        (in.parser(s) ~ ff.parser(s)).map { case (ta1, tf) =>
+          Task.taskMonad.ap(tf)(ta1)
+        }
+      )
+    override def map[A1, A2](in: InputTask[A1])(f: A1 => A2): InputTask[A2] =
+      InputTask[A2]((s: State) =>
+        in.parser(s).map { ta1 =>
+          ta1.map(f)
+        }
+      )
 end InputTask
+
+class ParserGen[A1](val p: Initialize[State => Parser[A1]]):
+  inline def mapTask[A2](inline action: A1 => A2): Initialize[InputTask[A2]] =
+    ${ std.InputTaskMacro.parserGenInputTaskMacroImpl[A1, A2]('this, 'action) }
+
+  inline def flatMapTask[A2](inline action: A1 => Initialize[Task[A2]]): Initialize[InputTask[A2]] =
+    ${ std.InputTaskMacro.parserGenFlatMapTaskImpl[A1, A2]('this, 'action) }
+end ParserGen

main-settings/src/main/scala/sbt/std/InputTaskMacro.scala.scala

@@ -195,4 +195,70 @@ object InputTaskMacro:
     }
   }
    */
+
+  def parserGenInputTaskMacroImpl[A1: Type, A2: Type](
+      parserGen: Expr[ParserGen[A1]],
+      tree: Expr[A1 => A2]
+  )(using
+      qctx: Quotes
+  ): Expr[Def.Initialize[InputTask[A2]]] =
+    inputTaskMacro0[A2]('{
+      val `arg$` = $parserGen.p.parsed
+      $tree(`arg$`)
+    })
+
+  def parserGenFlatMapTaskImpl[A1: Type, A2: Type](
+      parserGen: Expr[ParserGen[A1]],
+      tree: Expr[A1 => Def.Initialize[Task[A2]]]
+  )(using
+      qctx: Quotes
+  ): Expr[Def.Initialize[InputTask[A2]]] =
+    import qctx.reflect.*
+    val convert1 = new FullConvert(qctx) // 1000
+    import convert1.Converted
+    def mkInputTask(params: List[ValDef], body: Term): Expr[Def.Initialize[InputTask[A2]]] =
+      val lambdaTpe =
+        MethodType(params.map(_.name))(
+          _ => List(TypeRepr.of[A1]),
+          _ => TypeRepr.of[Def.Initialize[Task[A2]]]
+        )
+      val lambda = Lambda(
+        owner = Symbol.spliceOwner,
+        tpe = lambdaTpe,
+        rhsFn = (sym, params) => {
+          val p0 = params.head.asInstanceOf[Ident]
+          val body2 =
+            convert1
+              .contFlatMap[A2, TaskMacro.F, Id](body.asExprOf[TaskMacro.F[A2]], convert1.appExpr)
+              .asTerm
+          object refTransformer extends TreeMap:
+            override def transformTerm(tree: Term)(owner: Symbol): Term =
+              tree match
+                case Ident(name) if name == p0.name => Ref(p0.symbol)
+                case _                              => super.transformTerm(tree)(owner)
+          end refTransformer
+          refTransformer.transformTerm(body2.changeOwner(sym))(sym)
+        }
+      )
+      val action = lambda.asExprOf[A1 => Def.Initialize[Task[A2]]]
+      '{
+        InputTask.createDyn[A1, A2](${ parserGen }.p)(
+          Def.valueStrict(TaskExtra.task[A1 => Def.Initialize[Task[A2]]]($action))
+        )
+      }
+    tree.asTerm match
+      case Lambda(params, body) =>
+        mkInputTask(params, body)
+      case Inlined(
+            _,
+            _,
+            Lambda(params, body),
+          ) =>
+        mkInputTask(params, body)
+      case Inlined(
+            _,
+            _,
+            Block(List(), Lambda(params, body)),
+          ) =>
+        mkInputTask(params, body)
 end InputTaskMacro

main-settings/src/main/scala/sbt/std/SettingMacro.scala

@@ -18,6 +18,7 @@ import sbt.internal.util.appmacro.{
 }
 import sbt.util.Applicative
 import scala.quoted.*
+import sbt.internal.util.complete.Parser
 
 class InitializeConvert[C <: Quotes & scala.Singleton](override val qctx: C)
     extends Convert[C](qctx)
@@ -48,14 +49,14 @@ object SettingMacro:
     val convert1 = InitializeConvert(qctx)
     convert1.contMapN[A1, F, Id](in, convert1.appExpr)
 
-/*
-  def settingDynMacroImpl[T: c.WeakTypeTag](
-      c: blackbox.Context
-  )(t: c.Expr[Initialize[T]]): c.Expr[Initialize[T]] =
-    Instance.contImpl[T, Id](c, InitializeInstance, InitializeConvert, MixedBuilder, EmptyLinter)(
-      Right(t),
-      Instance.idTransform[c.type]
-    )
- */
+  def settingDynImpl[A1: Type](in: Expr[Initialize[A1]])(using qctx: Quotes): Expr[Initialize[A1]] =
+    val convert1 = InitializeConvert(qctx)
+    convert1.contFlatMap[A1, F, Id](in, convert1.appExpr)
 
+  def inputMacroImpl[A1: Type](in: Expr[State => Parser[A1]])(using
+      qctx: Quotes
+  ): Expr[ParserGen[A1]] =
+    val convert1 = InitializeConvert(qctx)
+    val init1 = convert1.contMapN[State => Parser[A1], F, Id](in, convert1.appExpr)
+    '{ ParserGen[A1]($init1) }
 end SettingMacro

main/src/main/scala/sbt/Defaults.scala

@@ -1439,8 +1439,7 @@ object Defaults extends BuildCommon {
 
   private[this] lazy val inputTests0: Initialize[InputTask[Unit]] = {
     val parser = loadForParser(definedTestNames)((s, i) => testOnlyParser(s, i getOrElse Nil))
-    Def.inputTaskDyn {
-      val (selected, frameworkOptions) = parser.parsed
+    ParserGen(parser).flatMapTask { case ((selected, frameworkOptions)) =>
       val s = streams.value
       val filter = testFilter.value
       val config = testExecution.value