Updated build `Helpers` file

project/Helpers.scala

@@ -1,30 +1,28 @@
 import sbt._
-import Keys._
+import sbt.Keys._
+
+import HelpersImpl._
+object Helpers extends AnyRef with PropertyHelper with VersionHelper with PomHelper
+
+/* Note: This file is shared among many projects. Avoid putting project-specific things here. */
+
+object HelpersImpl {
+  sealed trait PropertyHelper {
+    private[this] lazy val boolNames = Set("yes", "y", "true", "t", "1")
 
-object Helpers {
     def getProp(name: String): Option[String] = sys.props.get(name) orElse sys.env.get(name)
-  def parseBool(str: String): Boolean = Set("yes", "y", "true", "t", "1") contains str.trim.toLowerCase
-  def boolFlag(name: String): Option[Boolean] = getProp(name) map { parseBool _ }
+    def parseBool(str: String): Boolean = boolNames(str.trim.toLowerCase)
+    def boolFlag(name: String): Option[Boolean] = getProp(name).map(parseBool)
     def boolFlag(name: String, default: Boolean): Boolean = boolFlag(name) getOrElse default
-  def opts(names: String*): Option[String] = names.view.map(getProp _).foldLeft(None: Option[String]) { _ orElse _ }
+    def intFlag(name: String) = getProp(name).map(_.toInt)
+    def intFlag(name: String, default: Int): Int = intFlag(name) getOrElse default
+    def opts(names: String*): Option[String] = names.collectFirst(Function.unlift(getProp))
 
     lazy val buildNumberOpt = sys.env.get("BUILD_NUMBER")
     lazy val isJenkins      = buildNumberOpt.isDefined
-
-  import scala.xml._
-  def excludePomDeps(exclude: (String, String) => Boolean): Node => Node = { node: Node =>
-    val rewriteRule = new transform.RewriteRule {
-      override def transform(n: Node): NodeSeq = {
-        if ((n.label == "dependency") && exclude((n \ "groupId").text, (n \ "artifactId").text))
-          NodeSeq.Empty
-        else
-          n
-      }
-    }
-    val transformer = new transform.RuleTransformer(rewriteRule)
-    transformer.transform(node)(0)
   }
 
+  sealed trait VersionHelper {
     final lazy val sver: Def.Initialize[SVer] = {
       Def.map(scalaBinaryVersion)(SVer.apply)
     }
@@ -80,4 +78,21 @@ object Helpers {
       override final val backend = NewBackend
       override final val requireJava8 = true
     }
+  }
+
+  sealed trait PomHelper {
+    import scala.xml.{ Node, NodeSeq }
+    import scala.xml.transform.{ RewriteRule, RuleTransformer }
+
+    def excludePomDeps(exclude: (String, String) => Boolean): Node => Node = { node: Node =>
+      def shouldExclude(n: Node): Boolean =
+        n.label == "dependency" && exclude((n \ "groupId").text, (n \ "artifactId").text)
+
+      val rewriteRule = new RewriteRule {
+        override def transform(n: Node): NodeSeq = if (shouldExclude(n)) NodeSeq.Empty else n
+      }
+      val transformer = new RuleTransformer(rewriteRule)
+      transformer.transform(node).head
+    }
+  }
 }