Remove custom ExternalHooks

This is now handled by passing a custom instance of ReadStamps to
CompileOptions instead.

build.sbt

@@ -903,6 +903,8 @@ lazy val mainProj = (project in file("main"))
       exclude[DirectMissingMethodProblem]("sbt.Plugins.topologicalSort"),
       exclude[IncompatibleMethTypeProblem]("sbt.Defaults.allTestGroupsTask"),
       exclude[DirectMissingMethodProblem]("sbt.StandardMain.shutdownHook"),
+      exclude[DirectMissingMethodProblem]("sbt.nio.Keys.compileBinaryFileInputs"),
+      exclude[DirectMissingMethodProblem]("sbt.nio.Keys.compileSourceFileInputs"),
       exclude[MissingClassProblem]("sbt.internal.ResourceLoaderImpl"),
       exclude[IncompatibleSignatureProblem]("sbt.internal.ConfigIndex.*"),
       exclude[IncompatibleSignatureProblem]("sbt.internal.Inspect.*"),
@@ -927,6 +929,8 @@ lazy val mainProj = (project in file("main"))
       exclude[MissingClassProblem]("sbt.internal.FileManagement$"),
       exclude[MissingClassProblem]("sbt.internal.FileManagement$CopiedFileTreeRepository"),
       exclude[MissingClassProblem]("sbt.internal.server.LanguageServerReporter*"),
+      exclude[MissingClassProblem]("sbt.internal.ExternalHooks"),
+      exclude[MissingClassProblem]("sbt.internal.ExternalHooks$"),
       // false positives
       exclude[DirectMissingMethodProblem]("sbt.plugins.IvyPlugin.requires"),
       exclude[DirectMissingMethodProblem]("sbt.plugins.JUnitXmlReportPlugin.requires"),

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

@@ -701,27 +701,6 @@ object Defaults extends BuildCommon {
     compileAnalysisFile := {
       compileAnalysisTargetRoot.value / compileAnalysisFilename.value
     },
-    /*
-    // Comment this out because Zinc now uses farm hash to invalidate the virtual paths.
-    // To use watch to detect initial changes, we need to revalidate using content hash.
-    externalHooks := {
-      import sbt.nio.FileChanges
-      import sjsonnew.BasicJsonProtocol.mapFormat
-      val currentInputs =
-        (unmanagedSources / inputFileStamps).value ++ (managedSourcePaths / outputFileStamps).value
-      val sv = scalaVersion.value
-      val previousInputs = compileSourceFileInputs.previous.flatMap(_.get(sv))
-      val inputChanges = previousInputs
-        .map(sbt.nio.Settings.changedFiles(_, currentInputs))
-        .getOrElse(FileChanges.noPrevious(currentInputs.map(_._1)))
-      val currentOutputs = (dependencyClasspathFiles / outputFileStamps).value
-      val previousOutputs = compileBinaryFileInputs.previous.flatMap(_.get(sv))
-      val outputChanges = previousOutputs
-        .map(sbt.nio.Settings.changedFiles(_, currentOutputs))
-        .getOrElse(FileChanges.noPrevious(currentOutputs.map(_._1)))
-      ExternalHooks.default.value(inputChanges, outputChanges, fileTreeView.value)
-    },
-     */
     externalHooks := IncOptions.defaultExternal,
     incOptions := {
       val old = incOptions.value

main/src/main/scala/sbt/internal/ExternalHooks.scala

@@ -1,170 +0,0 @@
-/*
- * sbt
- * Copyright 2011 - 2018, Lightbend, Inc.
- * Copyright 2008 - 2010, Mark Harrah
- * Licensed under Apache License 2.0 (see LICENSE)
- */
-
-/*
-package sbt.internal
-
-import java.nio.file.{ Path, Paths }
-import java.util.Optional
-
-import sbt.Def
-import sbt.Keys._
-import sbt.internal.inc.ExternalLookup
-import sbt.internal.inc.Stamp.equivStamp.equiv
-import sbt.nio.Keys._
-import sbt.nio.file.syntax._
-import sbt.nio.file.{ FileAttributes, FileTreeView, RecursiveGlob }
-import sbt.nio.{ FileChanges, FileStamp, FileStamper }
-import sbt.util.InterfaceUtil.jo2o
-import xsbti.{ VirtualFile, VirtualFileRef }
-import xsbti.api.AnalyzedClass
-import xsbti.compile._
-import xsbti.compile.analysis.Stamp
-
-private[sbt] object ExternalHooks {
-  private type Func =
-    (FileChanges, FileChanges, FileTreeView[(Path, FileAttributes)]) => ExternalHooks
-  def default: Def.Initialize[sbt.Task[Func]] = Def.task {
-    val unmanagedCache = unmanagedFileStampCache.value
-    val managedCache = managedFileStampCache.value
-    val cp = dependencyClasspath.value.map(_.data)
-    cp.foreach { file =>
-      val path = file.toPath
-      managedCache.getOrElseUpdate(path, FileStamper.Hash)
-    }
-    val classGlob = classDirectory.value.toGlob / RecursiveGlob / "*.class"
-    val options = (compileOptions in compile).value
-    ((inputFileChanges, outputFileChanges, fileTreeView) => {
-      fileTreeView.list(classGlob).foreach {
-        case (path, _) =>
-          s"updating $path"
-          managedCache.update(path, FileStamper.Hash)
-      }
-      apply(inputFileChanges, outputFileChanges, options, unmanagedCache, managedCache)
-    }): Func
-  }
-  private def apply(
-      inputFileChanges: FileChanges,
-      outputFileChanges: FileChanges,
-      options: CompileOptions,
-      unmanagedCache: FileStamp.Cache,
-      managedCache: FileStamp.Cache
-  ): DefaultExternalHooks = {
-    val converter = jo2o(options.converter) getOrElse {
-      sys.error("file converter was expected")
-    }
-    val lookup = new ExternalLookup {
-      override def changedSources(
-          previousAnalysis: CompileAnalysis
-      ): Option[Changes[VirtualFileRef]] = Some {
-        new Changes[VirtualFileRef] {
-          override val getAdded: java.util.Set[VirtualFileRef] =
-            new java.util.HashSet[VirtualFileRef]
-          override val getRemoved: java.util.Set[VirtualFileRef] =
-            new java.util.HashSet[VirtualFileRef]
-          override val getChanged: java.util.Set[VirtualFileRef] =
-            new java.util.HashSet[VirtualFileRef]
-          override val getUnmodified: java.util.Set[VirtualFileRef] =
-            new java.util.HashSet[VirtualFileRef]
-
-          override def toString: String =
-            s"""Changes(added = $getAdded, removed = $getRemoved, changed = $getChanged, unmodified = ...)"""
-
-          private def add(p: VirtualFileRef, sets: java.util.Set[VirtualFileRef]*): Unit = {
-            sets.foreach(add(p, _))
-          }
-          private def add(f: VirtualFileRef, set: java.util.Set[VirtualFileRef]): Unit = {
-            set.add(f); ()
-          }
-          val allChanges = new java.util.HashSet[VirtualFileRef]
-          inputFileChanges match {
-            case FileChanges(c, d, m, _) =>
-              c.map(converter.toVirtualFile).foreach(add(_, getAdded, allChanges))
-              d.map(converter.toVirtualFile).foreach(add(_, getRemoved, allChanges))
-              m.map(converter.toVirtualFile).foreach(add(_, getChanged, allChanges))
-            case _ =>
-          }
-          override def isEmpty: java.lang.Boolean =
-            getAdded.isEmpty && getRemoved.isEmpty && getChanged.isEmpty
-
-          private val prevSources = previousAnalysis.readStamps().getAllSourceStamps
-          prevSources.forEach { (file: VirtualFileRef, s: Stamp) =>
-            if (!allChanges.contains(file)) {
-              val path: Path = converter.toPath(file)
-              unmanagedCache
-                .get(path)
-                .orElse(managedCache.getOrElseUpdate(path, FileStamper.Hash)) match {
-                case None => add(file, getRemoved)
-                case Some(stamp) =>
-                  if (equiv(stamp.stamp, s)) add(file, getUnmodified)
-                  else add(file, getChanged)
-              }
-            }
-          }
-          options.sources.foreach(file => if (!prevSources.containsKey(file)) getAdded.add(file))
-        }
-      }
-
-      override def shouldDoIncrementalCompilation(
-          set: Set[String],
-          compileAnalysis: CompileAnalysis
-      ): Boolean = true
-
-      // This could use the cache as well, but it would complicate the cache implementation.
-      override def hashClasspath(files: Array[VirtualFile]): Optional[Array[FileHash]] =
-        Optional.empty[Array[FileHash]]
-
-      import scala.collection.JavaConverters._
-      private val javaHome = Option(System.getProperty("java.home")).map(Paths.get(_))
-      override def changedBinaries(
-          previousAnalysis: CompileAnalysis
-      ): Option[Set[VirtualFileRef]] = {
-        val base: Set[VirtualFileRef] =
-          (outputFileChanges.modified ++ outputFileChanges.created ++ outputFileChanges.deleted)
-            .map(converter.toVirtualFile(_))
-            .toSet
-        Some(base ++ previousAnalysis.readStamps.getAllLibraryStamps.asScala.flatMap {
-          case (file, stamp) =>
-            val path = converter.toPath(file)
-            val stampOpt = managedCache.getOrElseUpdate(path, FileStamper.Hash)
-            stampOpt match {
-              case Some(s) if equiv(s.stamp, stamp) => None
-              case _ =>
-                javaHome match {
-                  case Some(h) if path.startsWith(h) => None
-                  case _ if file.name == "rt.jar"    => None
-                  case _                             =>
-                    // stampOpt map { s => println(s"stamp changed for $file from ${s.stamp} to $stamp") }
-                    Some(file)
-                }
-            }
-        })
-      }
-
-      override def removedProducts(
-          previousAnalysis: CompileAnalysis
-      ): Option[Set[VirtualFileRef]] = {
-        None
-        Some(previousAnalysis.readStamps.getAllProductStamps.asScala.flatMap {
-          case (file, stamp) =>
-            val path = converter.toPath(file)
-            managedCache.get(path) match {
-              case Some(s) if equiv(s.stamp, stamp) => None
-              case Some(s)                          => Some(file)
-              case _                                =>
-                // This shouldn't be necessary
-                if (java.nio.file.Files.exists(path)) None
-                else Some(file)
-            }
-        }.toSet)
-      }
-      override def lookupAnalyzedClass(binaryClassName: String): Option[AnalyzedClass] = None
-    }
-    new DefaultExternalHooks(Optional.of(lookup), Optional.empty[ClassFileManager])
-  }
-}
- */

main/src/main/scala/sbt/nio/Keys.scala

@@ -181,12 +181,6 @@ object Keys {
   private[sbt] val dependencyClasspathFiles =
     taskKey[Seq[Path]]("The dependency classpath for a task.").withRank(Invisible)
   private[sbt] val compileOutputs = taskKey[Seq[Path]]("Compilation outputs").withRank(Invisible)
-  private[sbt] val compileSourceFileInputs =
-    taskKey[Map[String, Seq[(Path, FileStamp)]]]("Source file stamps stored by scala version")
-      .withRank(Invisible)
-  private[sbt] val compileBinaryFileInputs =
-    taskKey[Map[String, Seq[(Path, FileStamp)]]]("Source file stamps stored by scala version")
-      .withRank(Invisible)
 
   private[this] val hasCheckedMetaBuildMsg =
     "Indicates whether or not we have called the checkBuildSources task. This is to avoid warning " +