From f4ff84db34fa87288c346af1b5b033f5ce8c7013 Mon Sep 17 00:00:00 2001
From: Josh Suereth <joshua.suereth@gmail.com>
Date: Fri, 1 Aug 2014 16:12:53 -0400
Subject: [PATCH] Fixes #1375 - Check for empty filenames.

Starting sbt in root isn't a great idea, but it shouldn't break.
---
 main/src/main/scala/sbt/Project.scala |  5 ++++-
 main/src/test/scala/ProjectSpec.scala | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 main/src/test/scala/ProjectSpec.scala

diff --git a/main/src/main/scala/sbt/Project.scala b/main/src/main/scala/sbt/Project.scala
index d9b3a8ee9..7753836ad 100755
--- a/main/src/main/scala/sbt/Project.scala
+++ b/main/src/main/scala/sbt/Project.scala
@@ -242,7 +242,10 @@ object Project extends ProjectExtra {
   def normalizeProjectID(id: String): Either[String, String] =
     {
       val attempt = normalizeBase(id)
-      val refined = if (!validProjectIDStart(attempt.substring(0, 1))) "root-" + attempt else attempt
+      val refined =
+        if (attempt.length < 1) "root"
+        else if (!validProjectIDStart(attempt.substring(0, 1))) "root-" + attempt
+        else attempt
       validProjectID(refined).toLeft(refined)
     }
   private[this] def normalizeBase(s: String) = s.toLowerCase(Locale.ENGLISH).replaceAll("""\W+""", "-")
diff --git a/main/src/test/scala/ProjectSpec.scala b/main/src/test/scala/ProjectSpec.scala
new file mode 100644
index 000000000..5dd9d6511
--- /dev/null
+++ b/main/src/test/scala/ProjectSpec.scala
@@ -0,0 +1,18 @@
+package sbt
+
+import org.specs2.Specification
+
+class ProjectSpec extends Specification {
+  def is = s2"""
+
+  This is a specification to check utility methods on the Project object
+
+  Project should
+    normalize projectIDs if they are empty  ${normalizeEmptyFileName}
+
+  """
+
+  def emptyFilename = ""
+
+  def normalizeEmptyFileName = Project.normalizeProjectID(emptyFilename) must equalTo(Right("root"))
+}
\ No newline at end of file