Extension functions + functions type with receivers

examples/src/Builder.jetl

@@ -0,0 +1,43 @@
+object AntBuilder() {
+
+  lazy val groovy = library {
+    classpath("$libs/groovy-...")
+  }
+
+  lazy val gant = library {
+    new File("$gantHome/lib").files.each {
+      classpath(it)
+    }
+  }
+
+  lazy val JPS = module {
+    targetLevel = "1.5"
+    classpath(antLayout, gant, groovy)
+    src("$projectHome/antLayout/src")
+  }
+
+}.build()
+
+class AntBuilder {
+  abstract class ClassPathEntry {}
+
+  class Module : ClassPathEntry {
+    fun classpath(entries : ClassPathEntry...) { ... }
+    var targetLevel : String
+    fun src(src : String) { ... }
+  }
+
+  class Library : ClassPathEntry {
+    fun classpath(entries : ClassPathEntry...) { ... }
+  }
+
+  fun library(initializer : Library.{ => Library}) {
+    val lib = new Library()
+    initializer(lib)
+    return lib
+  }
+
+  fun classpath
+
+  fun module
+}