'set every <setting>' for overriding every definition of a key. fixes #154

main/CommandSupport.scala

@@ -106,7 +106,7 @@ InspectCommand + """ [tree] <key>
 	"Related" shows all of the scopes in which the key is defined."""
 
 	val SetCommand = "set"
-	val setBrief = (SetCommand + " <setting-expression>", "Evaluates the given Setting and applies it to the current project.")
+	val setBrief = (SetCommand + "[every] <setting-expression>", "Evaluates the given Setting and applies it to the current project.")
 	val setDetailed =
 SetCommand + """ <setting-expression>
 
@@ -117,7 +117,12 @@ SetCommand + """ <setting-expression>
 
 	This command does not rebuild the build definitions, plugins, or configurations.
 	It does not automatically persist the setting(s) either.
-	To persist the setting(s), run 'session save' or 'session save-all'."""
+	To persist the setting(s), run 'session save' or 'session save-all'.
+
+	If 'every' is specified, the setting is evaluated in the current context
+	and the resulting value is used in every scope.  This overrides the value
+	bound to the key everywhere.
+"""
 
 	def SessionCommand = "session"
 	def sessionBrief = (SessionCommand + " <session-command>", "Manipulates session settings.  For details, run 'help " + SessionCommand + "'.")

main/Load.scala

@@ -519,7 +519,7 @@ object Load
 	}
 
 	def initialSession(structure: BuildStructure, rootEval: () => Eval): SessionSettings =
-		new SessionSettings(structure.root, rootProjectMap(structure.units), structure.settings, Map.empty, rootEval)
+		new SessionSettings(structure.root, rootProjectMap(structure.units), structure.settings, Map.empty, Nil, rootEval)
 		
 	def rootProjectMap(units: Map[URI, LoadedBuildUnit]): Map[URI, String] =
 	{

main/Main.scala

@@ -387,14 +387,19 @@ object BuiltinCommands
 		val newStructure = Load.reapply(newSession.mergeSettings, structure)( Project.showContextKey(newSession, structure) )
 		Project.setProject(newSession, newStructure, s)
 	}
-	def set = Command.single(SetCommand, setBrief, setDetailed) { (s, arg) =>
+	def set = Command(SetCommand, setBrief, setDetailed)(setParser) { case (s, (all, arg)) =>
 		val extracted = Project extract s
 		import extracted._
 		val settings = EvaluateConfigurations.evaluateSetting(session.currentEval(), "<set>", imports(extracted), arg, 0)(currentLoader)
-		val append = Load.transformSettings(Load.projectScope(currentRef), currentRef.build, rootProject, settings)
-		val newSession = session.appendSettings( append map (a => (a, arg)))
+		val newSession = if(all) Project.setAll(extracted, settings) else setThis(s, extracted, settings, arg)
 		reapply(newSession, structure, s)
 	}
+	def setThis(s: State, extracted: Extracted, settings: Seq[Project.Setting[_]], arg: String) =
+	{
+		import extracted._
+		val append = Load.transformSettings(Load.projectScope(currentRef), currentRef.build, rootProject, settings)
+		session.appendSettings( append map (a => (a, arg)))
+	}
 	def inspect = Command(InspectCommand, inspectBrief, inspectDetailed)(inspectParser) { case (s, (option, sk)) => 
 		logger(s).info(inspectOutput(s, option, sk))
 		s
@@ -430,6 +435,9 @@ object BuiltinCommands
 		val ext = Project.extract(s)
 		(ext.structure, Select(ext.currentRef), ext.showKey)
 	}
+
+	def setParser = (s: State) => token(Space ~> flag("every" ~ Space)) ~ token(any.+.string)
+
 		import InspectOption._
 	def inspectParser = (s: State) => spacedInspectOptionParser(s) flatMap {
 		case opt @ (Uses | Definitions) => allKeyParser(s).map(key => (opt, Project.ScopedKey(Global, key)))

main/Project.scala

@@ -317,6 +317,27 @@ object Project extends Init[Scope] with ProjectExtra
 	def reverseDependencies(cMap: Map[ScopedKey[_],Flattened], scoped: ScopedKey[_]): Iterable[ScopedKey[_]] =
 		for( (key,compiled) <- cMap; dep <- compiled.dependencies if dep == scoped)  yield  key
 
+	def setAll(extracted: Extracted, settings: Seq[Setting[_]]) =
+	{
+			import extracted._
+		val allDefs = relation(extracted.structure, true)._1s.toSeq
+		val projectScope = Load.projectScope(currentRef)
+		def resolve(s: Setting[_]): Seq[Setting[_]] = Load.transformSettings(projectScope, currentRef.build, rootProject, s :: Nil)
+		def rescope[T](setting: Setting[T]): Seq[Setting[_]] =
+		{
+			val akey = setting.key.key
+			val global = ScopedKey(Global, akey)
+			val globalSetting = resolve( Project.setting(global, setting.init) )
+			globalSetting ++ allDefs.flatMap { d =>
+				if(d.key == akey)
+					Seq( SettingKey(akey) in d.scope <<= global)
+				else
+					Nil
+			}
+		}
+		extracted.session.appendRaw(settings flatMap { x => rescope(x) } )
+	}
+
 	object LoadAction extends Enumeration {
 		val Return, Current, Plugins = Value
 	}

main/SessionSettings.scala

@@ -11,14 +11,15 @@ package sbt
 
 	import SessionSettings._
 
-final case class SessionSettings(currentBuild: URI, currentProject: Map[URI, String], original: Seq[Setting[_]], append: SessionMap, currentEval: () => Eval)
+final case class SessionSettings(currentBuild: URI, currentProject: Map[URI, String], original: Seq[Setting[_]], append: SessionMap, rawAppend: Seq[Setting[_]], currentEval: () => Eval)
 {
 	assert(currentProject contains currentBuild, "Current build (" + currentBuild + ") not associated with a current project.")
 	def setCurrent(build: URI, project: String, eval: () => Eval): SessionSettings = copy(currentBuild = build, currentProject = currentProject.updated(build, project), currentEval = eval)
 	def current: ProjectRef = ProjectRef(currentBuild, currentProject(currentBuild))
 	def appendSettings(s: Seq[SessionSetting]): SessionSettings = copy(append = modify(append, _ ++ s))
-	def mergeSettings: Seq[Setting[_]] = original ++ merge(append)
-	def clearExtraSettings: SessionSettings = copy(append = Map.empty)
+	def appendRaw(ss: Seq[Setting[_]]): SessionSettings = copy(rawAppend = rawAppend ++ ss)
+	def mergeSettings: Seq[Setting[_]] = original ++ merge(append) ++ rawAppend
+	def clearExtraSettings: SessionSettings = copy(append = Map.empty, rawAppend = Nil)
 
 	private[this] def merge(map: SessionMap): Seq[Setting[_]] = map.values.toSeq.flatten[SessionSetting].map(_._1)
 	private[this] def modify(map: SessionMap, onSeq: Endo[Seq[SessionSetting]]): SessionMap =