Merge pull request #8118 from xuwei-k/previous-macro

[2.x] simplify `previous` macro

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

@@ -398,7 +398,7 @@ object Def extends BuildSyntax with Init with InitializeImplicits:
   extension [A1](inline in: TaskKey[A1])
     // implicit def macroPrevious[T](@deprecated("unused", "") in: TaskKey[T]): MacroPrevious[T] = ???
     inline def previous(using JsonFormat[A1]): Option[A1] =
-      ${ TaskMacro.previousImpl[A1]('in) }
+      InputWrapper.`wrapInitTask_\u2603\u2603`[Option[A1]](Previous.runtime[A1](in))
 
   // The following conversions enable the types Parser[T], Initialize[Parser[T]], and
   // Initialize[State => Parser[T]] to be used in the inputTask macro as an input with an ultimate

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

@@ -23,7 +23,6 @@ import sbt.internal.util.{ LinePosition, NoPosition, SourcePosition }
 
 import language.experimental.macros
 import scala.quoted.*
-import sjsonnew.JsonFormat
 import sbt.util.BuildWideCacheConfiguration
 
 object TaskMacro:
@@ -92,18 +91,6 @@ object TaskMacro:
     val convert1 = new FullConvert(qctx, 1000)
     convert1.contFlatMap[A1, F, Id](t, convert1.appExpr, None)
 
-  /** Translates <task: TaskKey[T]>.previous(format) to Previous.runtime(<task>)(format).value */
-  def previousImpl[A1: Type](t: Expr[TaskKey[A1]])(using
-      qctx: Quotes
-  ): Expr[Option[A1]] =
-    import qctx.reflect.*
-    Expr.summon[JsonFormat[A1]] match
-      case Some(ev) =>
-        '{
-          InputWrapper.`wrapInitTask_\u2603\u2603`[Option[A1]](Previous.runtime[A1]($t)(using $ev))
-        }
-      case _ => report.errorAndAbort(s"JsonFormat[${Type.show[A1]}] missing")
-
   /** Implementation of := macro for settings. */
   def settingAssignMacroImpl[A1: Type](rec: Expr[Scoped.DefinableSetting[A1]], v: Expr[A1])(using
       qctx: Quotes