project/Pre213Preprocessor.scala

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * license agreements; and to You under the Apache License, version 2.0:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * This file is part of the Apache Pekko project, which was derived from Akka.
 */

import sbt._
import Keys._

object Pre213Preprocessor extends AutoPlugin {
  val pre213Files = settingKey[Seq[String]]("files that should be edited for pre213 annotation")

  val pattern = """(?s)@pre213.*?@since213""".r

  override def projectSettings: Seq[Def.Setting[_]] = {
    Compile / sources := {
      if (scalaVersion.value.startsWith("3")) {
        val filter: File => Boolean =
          f => pre213Files.value.exists(suffix => f.getAbsolutePath.replace("\\", "//").endsWith(suffix))
        (Compile / sources).value.map { s =>
          if (filter(s)) {
            val data = IO.read(s)
            val targetFile = sourceManaged.value / s.getName
            val newData = pattern.replaceAllIn(data, "@since213")
            IO.write(targetFile, newData)
            targetFile
          } else s
        }
      } else (Compile / sources).value
    }
  }
}