From d4e16acd28f1dec82c213403f78d0e33cca4a791 Mon Sep 17 00:00:00 2001
From: Josh Suereth <joshua.suereth@gmail.com>
Date: Thu, 1 Dec 2011 10:18:08 -0500
Subject: Port of SBT 0.11.x build.  Things appear to be working well.

---
 project/Sametest.scala | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 project/Sametest.scala

(limited to 'project/Sametest.scala')

diff --git a/project/Sametest.scala b/project/Sametest.scala
new file mode 100644
index 0000000000..f44fe8ec65
--- /dev/null
+++ b/project/Sametest.scala
@@ -0,0 +1,66 @@
+import sbt._
+
+import Build._
+import Keys._
+
+// This code is adapted from scala.tools.ant.Same by Gilles Dubochet.
+object SameTest {
+  lazy val checkSame: TaskKey[Unit] = TaskKey("check-same-binaries", "checks whether or not the class files generated by scala are the same.")
+  lazy val checkSameLibrary: TaskKey[Unit] = TaskKey("check-same-lib-binaries", "checks whether or not the librayr class files generated by scala are the same.")
+  lazy val checkSameCompiler: TaskKey[Unit] = TaskKey("check-same-comp-binaries", "checks whether or not the compiler class files generated by scala are the same.")
+
+  def checkSameBinaryProjects(lhs: Project, rhs: Project): Project.Initialize[Task[Unit]] =
+    (classDirectory in Compile in lhs, classDirectory in Compile in rhs, 
+     compile in Compile in lhs, compile in Compile in rhs, streams) map { (lhs,rhs, _, _, s) => 
+      // Now we generate a complete set of relative files and then
+      def relativeClasses(dir: File) = (dir ** "*.class").get.flatMap(IO.relativize(dir,_).toList)
+      // This code adapted from SameTask in the compiler.
+      def hasDifferentFiles(filePairs: Seq[(File,File)]): Boolean = {
+        filePairs exists { case (a,b) =>
+          if (!a.canRead || !b.canRead) {
+            s.log.error("Either ["+a+"] or ["+b+"] is missing.")
+            true
+          } else {
+            s.log.debug("Checking for binary differences in ["+a+"] against ["+b+"].")          
+            val diff = !checkSingleFilePair(a,b) 
+            if(diff) s.log.error("["+a+"] differs from ["+b+"]")
+            diff
+          }
+        }
+      }
+      val allClassMappings = (relativeClasses(lhs) ++ relativeClasses(rhs)).distinct
+      val comparisons = allClassMappings.map(f => new File(lhs, f) -> new File(rhs, f))
+      val result = hasDifferentFiles(comparisons)
+      if (result) error("Binary artifacts differ.")
+    }
+
+  val bufferSize = 1024
+
+  // Tests whether two files are binary equivalents of each other.
+  def checkSingleFilePair(originFile: File, destFile: File): Boolean = {
+    Using.fileInputStream(originFile) { originStream =>
+      Using.fileInputStream(destFile) { destStream =>
+        val originBuffer = new Array[Byte](bufferSize)
+        val destBuffer = new Array[Byte](bufferSize)
+        var equalNow = true
+        var originRemaining = originStream.read(originBuffer)
+        var destRemaining = destStream.read(destBuffer)
+        while (originRemaining > 0 && equalNow) {
+          if (originRemaining == destRemaining) {
+            for (idx <- 0 until originRemaining) {
+              equalNow = equalNow && (originBuffer(idx) == destBuffer(idx))
+            }
+          } else {
+            equalNow = false
+          }
+          originRemaining = originStream.read(originBuffer)
+          destRemaining = destStream.read(destBuffer)
+        }
+        if (destRemaining > 0) equalNow = false
+        equalNow
+      }
+    }
+  }
+
+
+}
-- 
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