Export build.sbt values inside sbt.

* Expose the values PAST the Eval/sbt.compiler package.
* Find projects using the name API rather than finding htem and dropping all values immediately.
* Adds a test to make sure the .sbt values are discovered and set-able
* Expose .sbt values in Set command and inside BuildUnit methods.
* Ensure `consoleProject` can see build.sbt values.
* Add notes for where we can look in the build if we want to expose .sbt values between files.

main/actions/src/main/scala/sbt/compiler/Eval.scala

@@ -88,7 +88,7 @@ final class Eval(optionsNoncp: Seq[String], classpath: Seq[File], mkReporter: Se
       val value = (cl: ClassLoader) => getValue[Any](i.enclosingModule, i.loader(cl))
       new EvalResult(i.extra, value, i.generated, i.enclosingModule)
     }
-  def evalDefinitions(definitions: Seq[(String, scala.Range)], imports: EvalImports, srcName: String, valTypes: Seq[String]): EvalDefinitions =
+  def evalDefinitions(definitions: Seq[(String, scala.Range)], imports: EvalImports, srcName: String): EvalDefinitions =
     {
       require(definitions.nonEmpty, "Definitions to evaluate cannot be empty.")
       val ev = new EvalType[Seq[String]] {
@@ -101,8 +101,7 @@ final class Eval(optionsNoncp: Seq[String], classpath: Seq[File], mkReporter: Se
           syntheticModule(fullParser, importTrees, trees.toList, moduleName)
         }
         def extra(run: Run, unit: CompilationUnit) = {
-          val tpes = valTypes.map(tpe => rootMirror.getRequiredClass(tpe).tpe)
-          atPhase(run.typerPhase.next) { (new ValExtractor(tpes)).getVals(unit.body) }
+          atPhase(run.typerPhase.next) { (new ValExtractor()).getVals(unit.body) }
         }
         def read(file: File) = IO.readLines(file)
         def write(value: Seq[String], file: File) = IO.writeLines(file, value)
@@ -215,11 +214,18 @@ final class Eval(optionsNoncp: Seq[String], classpath: Seq[File], mkReporter: Se
     }
   }
   /** Tree traverser that obtains the names of vals in a top-level module whose type is a subtype of one of `types`.*/
-  private[this] final class ValExtractor(types: Seq[Type]) extends Traverser {
+  private[this] final class ValExtractor() extends Traverser {
     private[this] var vals = List[String]()
     def getVals(t: Tree): List[String] = { vals = Nil; traverse(t); vals }
     override def traverse(tree: Tree): Unit = tree match {
-      case ValDef(_, n, actualTpe, _) if isTopLevelModule(tree.symbol.owner) && types.exists(_ <:< actualTpe.tpe) =>
+      // TODO - We really need to clean this up so that we can filter by type and
+      // track which vals are projects vs. other vals.  It's important so that we avoid
+      // instantiating values more than absolutely necessary on different classloaders.
+      // However, it's not terrible right now if we do, as most likely the values
+      // are used to instantiate each other i.e. a valuing in a build.sbt file is most likely
+      // used in something which is contained in a `Project` vaue, therefore it will be
+      // instantiated anyway.
+      case ValDef(_, n, actualTpe, _) if isTopLevelModule(tree.symbol.owner) =>
         vals ::= nme.localToGetter(n).encoded
       case _ => super.traverse(tree)
     }
@@ -387,7 +393,7 @@ final class Eval(optionsNoncp: Seq[String], classpath: Seq[File], mkReporter: Se
     private[this] def index(a: Array[Int], i: Int): Int = if (i < 0 || i >= a.length) 0 else a(i)
   }
 }
-private object Eval {
+private[sbt] object Eval {
   def optBytes[T](o: Option[T])(f: T => Array[Byte]): Array[Byte] = seqBytes(o.toSeq)(f)
   def stringSeqBytes(s: Seq[String]): Array[Byte] = seqBytes(s)(bytes)
   def seqBytes[T](s: Seq[T])(f: T => Array[Byte]): Array[Byte] = bytes(s map f)

main/src/main/scala/sbt/BuildStructure.scala

@@ -50,15 +50,15 @@ final class LoadedBuildUnit(val unit: BuildUnit, val defined: Map[String, Resolv
 
   /**
    * The classpath to use when compiling against this build unit's publicly visible code.
-   * It includes build definition and plugin classes, but not classes for .sbt file statements and expressions.
+   * It includes build definition and plugin classes and classes for .sbt file statements and expressions.
    */
-  def classpath: Seq[File] = unit.definitions.target ++ unit.plugins.classpath
+  def classpath: Seq[File] = unit.definitions.target ++ unit.plugins.classpath ++ unit.definitions.dslDefinitions.classpath
 
   /**
    * The class loader to use for this build unit's publicly visible code.
-   * It includes build definition and plugin classes, but not classes for .sbt file statements and expressions.
+   * It includes build definition and plugin classes and classes for .sbt file statements and expressions.
    */
-  def loader = unit.definitions.loader
+  def loader = unit.definitions.dslDefinitions.classloader(unit.definitions.loader)
 
   /** The imports to use for .sbt files, `consoleProject` and other contexts that use code from the build definition. */
   def imports = BuildUtil.getImports(unit)
@@ -80,7 +80,21 @@ final class LoadedBuildUnit(val unit: BuildUnit, val defined: Map[String, Resolv
  *                 and their `settings` and `configurations` updated as appropriate.
  * @param buildNames No longer used and will be deprecated once feasible.
  */
-final class LoadedDefinitions(val base: File, val target: Seq[File], val loader: ClassLoader, val builds: Seq[Build], val projects: Seq[Project], val buildNames: Seq[String])
+final class LoadedDefinitions(
+    val base: File,
+    val target: Seq[File],
+    val loader: ClassLoader,
+    val builds: Seq[Build],
+    val projects: Seq[Project],
+    val buildNames: Seq[String],
+    val dslDefinitions: DefinedSbtValues) {
+  def this(base: File,
+    target: Seq[File],
+    loader: ClassLoader,
+    builds: Seq[Build],
+    projects: Seq[Project],
+    buildNames: Seq[String]) = this(base, target, loader, builds, projects, buildNames, DefinedSbtValues.empty)
+}
 
 /** Auto-detected top-level modules (as in `object X`) of type `T` paired with their source names. */
 final class DetectedModules[T](val modules: Seq[(String, T)]) {

main/src/main/scala/sbt/BuildUtil.scala

@@ -71,7 +71,7 @@ object BuildUtil {
 
   def baseImports: Seq[String] = "import sbt._, Keys._, dsl._" :: Nil
 
-  def getImports(unit: BuildUnit): Seq[String] = unit.plugins.detected.imports
+  def getImports(unit: BuildUnit): Seq[String] = unit.plugins.detected.imports ++ unit.definitions.dslDefinitions.imports
 
   @deprecated("Use getImports(Seq[String]).", "0.13.2")
   def getImports(pluginNames: Seq[String], buildNames: Seq[String]): Seq[String] = getImports(pluginNames ++ buildNames)

main/src/main/scala/sbt/ConsoleProject.scala

@@ -9,14 +9,16 @@ object ConsoleProject {
   def apply(state: State, extra: String, cleanupCommands: String = "", options: Seq[String] = Nil)(implicit log: Logger) {
     val extracted = Project extract state
     val cpImports = new Imports(extracted, state)
-
     val bindings = ("currentState" -> state) :: ("extracted" -> extracted) :: ("cpHelpers" -> cpImports) :: Nil
     val unit = extracted.currentUnit
     val compiler = Compiler.compilers(ClasspathOptions.repl)(state.configuration, log).scalac
     val imports = BuildUtil.getImports(unit.unit) ++ BuildUtil.importAll(bindings.map(_._1))
     val importString = imports.mkString("", ";\n", ";\n\n")
     val initCommands = importString + extra
-    (new Console(compiler))(unit.classpath, options, initCommands, cleanupCommands)(Some(unit.loader), bindings)
+    // TODO - Hook up dsl classpath correctly...
+    (new Console(compiler))(
+      unit.classpath, options, initCommands, cleanupCommands
+    )(Some(unit.loader), bindings)
   }
   /** Conveniences for consoleProject that shouldn't normally be used for builds. */
   final class Imports private[sbt] (extracted: Extracted, state: State) {

main/src/main/scala/sbt/EvaluateConfigurations.scala

@@ -99,12 +99,13 @@ object EvaluateConfigurations {
       //        detection for which project project manipulations should be applied.
       val name = file.getPath
       val parsed = parseConfiguration(lines, imports, offset)
-      val (importDefs, projects) = if (parsed.definitions.isEmpty) (Nil, (l: ClassLoader) => Nil) else {
-        val definitions = evaluateDefinitions(eval, name, parsed.imports, parsed.definitions)
-        val imp = BuildUtil.importAllRoot(definitions.enclosingModule :: Nil)
-        val projs = (loader: ClassLoader) => definitions.values(loader).map(p => resolveBase(file.getParentFile, p.asInstanceOf[Project]))
-        (imp, projs)
-      }
+      val (importDefs, definitions) =
+        if (parsed.definitions.isEmpty) (Nil, DefinedSbtValues.empty) else {
+          val definitions = evaluateDefinitions(eval, name, parsed.imports, parsed.definitions)
+          val imp = BuildUtil.importAllRoot(definitions.enclosingModule :: Nil)
+          val projs = (loader: ClassLoader) => definitions.values(loader).map(p => resolveBase(file.getParentFile, p.asInstanceOf[Project]))
+          (imp, DefinedSbtValues(definitions))
+        }
       val allImports = importDefs.map(s => (s, -1)) ++ parsed.imports
       val dslEntries = parsed.settings map {
         case (dslExpression, range) =>
@@ -112,6 +113,10 @@ object EvaluateConfigurations {
       }
       eval.unlinkDeferred()
       loader => {
+        val projects =
+          definitions.values(loader).collect {
+            case p: Project => resolveBase(file.getParentFile, p)
+          }
         val (settingsRaw, manipulationsRaw) =
           dslEntries map (_ apply loader) partition {
             case internals.ProjectSettings(_) => true
@@ -124,9 +129,8 @@ object EvaluateConfigurations {
         val manipulations = manipulationsRaw map {
           case internals.ProjectManipulation(f) => f
         }
-        val ps = projects(loader)
         // TODO -get project manipulations.
-        new LoadedSbtFile(settings, ps, importDefs, manipulations)
+        new LoadedSbtFile(settings, projects, importDefs, manipulations, definitions)
       }
     }
   /** move a project to be relative to this file after we've evaluated it. */
@@ -184,7 +188,7 @@ object EvaluateConfigurations {
    * @return A method that given an sbt classloader, can return the actual Seq[Setting[_]] defined by
    *         the expression.
    */
-  @deprecated("Build DSL now includes non-Setting[_] type settings.", "0.13.6")
+  @deprecated("Build DSL now includes non-Setting[_] type settings.", "0.13.6") // Note: This method is used by the SET command, so we may want to evaluate that sucker a bit.
   def evaluateSetting(eval: Eval, name: String, imports: Seq[(String, Int)], expression: String, range: LineRange): ClassLoader => Seq[Setting[_]] =
     {
       evaluateDslEntry(eval, name, imports, expression, range) andThen {
@@ -231,11 +235,10 @@ object EvaluateConfigurations {
       val trimmed = line.trim
       DefinitionKeywords.exists(trimmed startsWith _)
     }
-  private[this] def evaluateDefinitions(eval: Eval, name: String, imports: Seq[(String, Int)], definitions: Seq[(String, LineRange)]) =
+  private[this] def evaluateDefinitions(eval: Eval, name: String, imports: Seq[(String, Int)], definitions: Seq[(String, LineRange)]): compiler.EvalDefinitions =
     {
       val convertedRanges = definitions.map { case (s, r) => (s, r.start to r.end) }
-      val findTypes = (classOf[Project] :: /*classOf[Build] :: */ Nil).map(_.getName)
-      eval.evalDefinitions(convertedRanges, new EvalImports(imports, name), name, findTypes)
+      eval.evalDefinitions(convertedRanges, new EvalImports(imports, name), name)
     }
 }
 object Index {

main/src/main/scala/sbt/Load.scala

@@ -426,9 +426,13 @@ object Load {
           val defaultProjects = loadProjects(projectsFromBuild(b, normBase), false)
           (defaultProjects ++ loadedProjectsRaw, b)
         }
-
       val defs = if (defsScala.isEmpty) defaultBuildIfNone :: Nil else defsScala
-      val loadedDefs = new sbt.LoadedDefinitions(defDir, Nil, plugs.loader, defs, loadedProjects, plugs.detected.builds.names)
+      // HERE we pull out the defined vals from memoSettings and unify them all so
+      // we can use them later.
+      val valDefinitions = memoSettings.values.foldLeft(DefinedSbtValues.empty) { (prev, sbtFile) =>
+        prev.zip(sbtFile.definitions)
+      }
+      val loadedDefs = new sbt.LoadedDefinitions(defDir, Nil, plugs.loader, defs, loadedProjects, plugs.detected.builds.names, valDefinitions)
       new sbt.BuildUnit(uri, normBase, loadedDefs, plugs)
     }
 
@@ -479,6 +483,9 @@ object Load {
    * @param context             The plugin management context for autogenerated IDs.
    *
    * @return The completely resolved/updated sequence of projects defined, with all settings expanded.
+   *
+   * TODO - We want to attach the known (at this time) vals/lazy vals defined in each project's
+   *        build.sbt to that project so we can later use this for the `set` command.
    */
   private[this] def loadTransitive(
     newProjects: Seq[Project],
@@ -518,12 +525,11 @@ object Load {
       // Continue loading if we find any more.
       newProjects match {
         case Seq(next, rest @ _*) =>
-          log.debug(s"[Loading]  Loading project ${next.id} @ ${next.base}")
+          log.debug(s"[Loading] Loading project ${next.id} @ ${next.base}")
           val (finished, discovered) = discoverAndLoad(next)
           loadTransitive(rest ++ discovered, buildBase, plugins, eval, injectSettings, acc :+ finished, memoSettings, log, false, buildUri, context)
         case Nil if makeOrDiscoverRoot =>
           log.debug(s"[Loading] Scanning directory ${buildBase}")
-          // TODO - Here we want to fully discover everything and make a default build...
           discover(AddSettings.defaultSbtFiles, buildBase) match {
             case DiscoveredProjects(Some(root), discovered, files) =>
               log.debug(s"[Loading] Found root project ${root.id} w/ remaining ${discovered.map(_.id).mkString(",")}")
@@ -651,6 +657,8 @@ object Load {
     // Classloader of the build
     val loader = loadedPlugins.loader
     // How to load an individual file for use later.
+    // TODO - We should import vals defined in other sbt files here, if we wish to
+    // share.  For now, build.sbt files have their own unique namespace.
     def loadSettingsFile(src: File): LoadedSbtFile =
       EvaluateConfigurations.evaluateSbtFile(eval(), src, IO.readLines(src), loadedPlugins.detected.imports, 0)(loader)
     // How to merge SbtFiles we read into one thing

main/src/main/scala/sbt/LoadedSbtFile.scala

@@ -1,6 +1,7 @@
 package sbt
 
 import Def.Setting
+import java.io.File
 
 /**
  * Represents the exported contents of a .sbt file.  Currently, that includes the list of settings,
@@ -10,15 +11,69 @@ private[sbt] final class LoadedSbtFile(
     val settings: Seq[Setting[_]],
     val projects: Seq[Project],
     val importedDefs: Seq[String],
-    val manipulations: Seq[Project => Project]) {
+    val manipulations: Seq[Project => Project],
+    // TODO - we may want to expose a simpler interface on top of here for the set command,
+    // rather than what we have now...
+    val definitions: DefinedSbtValues) {
   @deprecated("LoadedSbtFiles are no longer directly merged.", "0.13.6")
   def merge(o: LoadedSbtFile): LoadedSbtFile =
-    new LoadedSbtFile(settings ++ o.settings, projects ++ o.projects, importedDefs ++ o.importedDefs, manipulations)
+    new LoadedSbtFile(
+      settings ++ o.settings,
+      projects ++ o.projects,
+      importedDefs ++ o.importedDefs,
+      manipulations,
+      definitions zip o.definitions)
 
-  def clearProjects = new LoadedSbtFile(settings, Nil, importedDefs, manipulations)
+  def clearProjects = new LoadedSbtFile(settings, Nil, importedDefs, manipulations, definitions)
 }
+
+/**
+ * Represents the `val`/`lazy val` definitions defined within a build.sbt file
+ * which we can reference in other settings.
+ */
+private[sbt] final class DefinedSbtValues(val sbtFiles: Seq[compiler.EvalDefinitions]) {
+
+  def values(parent: ClassLoader): Seq[Any] =
+    sbtFiles flatMap (_ values parent)
+
+  def classloader(parent: ClassLoader): ClassLoader =
+    sbtFiles.foldLeft(parent) { (cl, e) => e.loader(cl) }
+
+  def imports: Seq[String] = {
+    // TODO - Sanity check duplicates and such, so users get a nice warning rather
+    // than explosion.
+    for {
+      file <- sbtFiles
+      m = file.enclosingModule
+      v <- file.valNames
+    } yield s"import ${m}.${v}"
+  }
+  def generated: Seq[File] =
+    sbtFiles flatMap (_.generated)
+
+  // Returns a classpath for the generated .sbt files.
+  def classpath: Seq[File] =
+    generated.map(_.getParentFile).distinct
+
+  /**
+   * Joins the defines of this build.sbt with another.
+   *  TODO - we may want to figure out scoping rules, as this could lead to
+   *  ambiguities.
+   */
+  def zip(other: DefinedSbtValues): DefinedSbtValues =
+    new DefinedSbtValues(sbtFiles ++ other.sbtFiles)
+}
+private[sbt] object DefinedSbtValues {
+  /** Construct a DefinedSbtValues object directly from the underlying representation. */
+  def apply(eval: compiler.EvalDefinitions): DefinedSbtValues =
+    new DefinedSbtValues(Seq(eval))
+  /** Construct an empty value object. */
+  def empty = new DefinedSbtValues(Nil)
+
+}
+
 private[sbt] object LoadedSbtFile {
   /** Represents an empty .sbt file: no Projects, imports, or settings.*/
-  def empty = new LoadedSbtFile(Nil, Nil, Nil, Nil)
+  def empty = new LoadedSbtFile(Nil, Nil, Nil, Nil, DefinedSbtValues.empty)
 }
 

main/src/main/scala/sbt/Main.scala

@@ -234,7 +234,19 @@ object BuiltinCommands {
     case (s, (all, arg)) =>
       val extracted = Project extract s
       import extracted._
-      val settings = EvaluateConfigurations.evaluateSetting(session.currentEval(), "<set>", imports(extracted), arg, LineRange(0, 0))(currentLoader)
+      val dslVals = extracted.currentUnit.unit.definitions.dslDefinitions
+      // TODO - This is horribly inefficient.  We should try to only attach the
+      // classloader + imports NEEDED to compile the set command.
+      System.err.println(s"DSL imports: ${dslVals.imports mkString "\n"}")
+      val ims = (imports(extracted) ++ dslVals.imports.map(i => (i, -1)))
+      val cl = dslVals.classloader(currentLoader)
+      val settings = EvaluateConfigurations.evaluateSetting(
+        session.currentEval(),
+        "<set>",
+        ims,
+        arg,
+        LineRange(0, 0)
+      )(cl)
       val setResult = if (all) SettingCompletions.setAll(extracted, settings) else SettingCompletions.setThis(s, extracted, settings, arg)
       s.log.info(setResult.quietSummary)
       s.log.debug(setResult.verboseSummary)

sbt/src/sbt-test/actions/set/build.sbt

@@ -0,0 +1,23 @@
+
+TaskKey[Unit]("checkName", "") := {
+	assert(name.value == "hello-world", "Name is not hello-worled, failed to set!")
+}
+
+val notExistingThing = settingKey[Int]("Something new")
+
+TaskKey[Unit]("checkBuildSbtDefined", "") := {
+	assert(notExistingThing.?.value == Some(5), "Failed to set a settingKey defined in build.sbt")
+}
+
+commands ++= Seq(
+  Command.command("helloWorldTest") { state: State =>
+     """set name := "hello-world"""" ::
+     "checkName" :: 
+     state
+  },
+  Command.command("buildSbtTest") { state: State =>
+     """set notExistingThing := 5""" ::
+     "checkBuildSbtDefined" :: 
+     state
+  }
+)

sbt/src/sbt-test/actions/set/test

@@ -0,0 +1,2 @@
+> helloWorldTest
+> buildSbtTest