Add support for dynamic re-configuration.

The exact precedence rule of override code vs original code may still
need to be tweaked as we go along.

3 files changed, 31 insertions, 4 deletions

diff --git a/stage2/BasicBuild.scala b/stage2/BasicBuild.scala
index ef4757e..752e0d2 100644
--- a/stage2/BasicBuild.scala
+++ b/stage2/BasicBuild.scala
@@ -246,6 +246,7 @@ trait BaseBuild extends BuildInterface with DependencyImplementation with Trigge
   override def show = this.getClass.getSimpleName ++ "(" ++ projectDirectory.string ++ ")"
 
   // TODO: allow people not provide the method name, maybe via macro
+  // TODO: pull this out into lib
   /**
   caches given value in context keyed with given key and projectDirectory
   the context is fresh on every complete run of cbt
@@ -261,4 +262,7 @@ trait BaseBuild extends BuildInterface with DependencyImplementation with Trigge
       value
     }
   }
+
+  // a method that can be called only to trigger any side-effects
+  final def `void` = ()
 }
diff --git a/stage2/BuildBuild.scala b/stage2/BuildBuild.scala
index 68603da..5eb7622 100644
--- a/stage2/BuildBuild.scala
+++ b/stage2/BuildBuild.scala
@@ -1,14 +1,18 @@
 package cbt
 import java.nio.file._
 
-trait BuildBuild extends BaseBuild{
-  private final val managedContext = context.copy(
+trait BuildBuild extends BuildBuildWithoutEssentials{
+  override def dependencies =
+    super.dependencies :+ plugins.essentials
+}
+trait BuildBuildWithoutEssentials extends BaseBuild{
+  protected final val managedContext = context.copy(
     projectDirectory = managedBuildDirectory,
     parentBuild=Some(this)
   )
 
   object plugins{
-    // TODO: maybe move this out of the OO?
+    // TODO: move this out of the OO
     final lazy val scalaTest = DirectoryDependency( context.cbtHome ++ "/plugins/scalatest" )
     final lazy val sbtLayout = DirectoryDependency( context.cbtHome ++ "/plugins/sbt_layout" )
     final lazy val scalaJs   = DirectoryDependency( context.cbtHome ++ "/plugins/scalajs" )
@@ -17,6 +21,7 @@ trait BuildBuild extends BaseBuild{
     final lazy val wartremover = DirectoryDependency( context.cbtHome ++ "/plugins/wartremover" )
     final lazy val uberJar = DirectoryDependency( context.cbtHome ++ "/plugins/uber-jar" )
     final lazy val sonatypeRelease = DirectoryDependency( context.cbtHome ++ "/plugins/sonatype-release" )
+    final lazy val essentials = DirectoryDependency( context.cbtHome ++ "/plugins/essentials" )
   }
 
   override def dependencies =
@@ -64,6 +69,12 @@ trait BuildBuild extends BaseBuild{
         throw new Exception(
           "No file build.scala (lower case) found in " ++ projectDirectory.getPath
         )
+      /*
+      // is this not needed?
+      } else if( projectDirectory.getParentFile.getName == "build" && projectDirectory.getParentFile.getParentFile.getName == "build" ){
+        // can't use essentiasy, when building essentials themselves
+        new BasicBuild( managedContext ) with BuildBuildWithoutEssentials
+      */
       } else if( projectDirectory.getParentFile.getName == "build" ){
         new BasicBuild( managedContext ) with BuildBuild
       } else {
diff --git a/stage2/Lib.scala b/stage2/Lib.scala
index 25183a3..3f6242f 100644
--- a/stage2/Lib.scala
+++ b/stage2/Lib.scala
@@ -48,7 +48,19 @@ final class Lib(logger: Logger) extends Stage1Lib(logger) with Scaffold{
 
     val rootBuildClassName = if( useBasicBuildBuild ) buildBuildClassName else buildClassName
     try{
-      if(useBasicBuildBuild) default( context ) else new cbt.BasicBuild( context.copy( projectDirectory = start ) ) with BuildBuild
+      if(useBasicBuildBuild)
+        default( context )
+      else if(
+        // essentials depends on eval, which has a build that depends on scalatest
+        // this means in these we can't depend on essentials
+        // hopefully we find a better way that this pretty hacky exclusion rule
+        context.projectDirectory == (context.cbtHome ++ "/plugins/essentials")
+        || context.projectDirectory == (context.cbtHome ++ "/libraries/eval")
+        || context.projectDirectory == (context.cbtHome ++ "/plugins/scalatest")
+      )
+        new cbt.BasicBuild( context.copy( projectDirectory = start ) ) with BuildBuildWithoutEssentials
+      else
+        new cbt.BasicBuild( context.copy( projectDirectory = start ) ) with BuildBuild
     } catch {
       case e:ClassNotFoundException if e.getMessage == rootBuildClassName =>
         throw new Exception(s"no class $rootBuildClassName found in " ++ start.string)