1 files changed, 64 insertions, 0 deletions
diff --git a/project/UnzipTask.scala b/project/UnzipTask.scala
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--- /dev/null
+++ b/project/UnzipTask.scala
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+/* =========================================================================================
+ * Copyright © 2013-2014 the kamon project <http://kamon.io/>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific language governing permissions
+ * and limitations under the License.
+ * =========================================================================================
+ */
+
+import sbt._
+import Keys._
+
+/** Helper task for jar/zip artifact unpacking. */
+object UnzipTask {
+
+  /** Helper task for jar/zip artifact unpacking. */
+  lazy val unzipTask = TaskKey[Unit]("unzip-task", "Unpack the jar/zip archive.")
+
+  /** Find artifact path by the module and classifier. */
+  def locateArtifact(report: UpdateReport, module: ModuleID,
+    classifier: String = ""): File =
+    {
+      val mf = moduleFilter(
+        organization = module.organization, name = module.name, revision = module.revision
+      )
+      val af = artifactFilter(
+        classifier = classifier
+      )
+      val pathList = report.select(module = mf, artifact = af)
+      require(pathList.size == 1, s"Wrong select: ${pathList}")
+      pathList(0)
+    }
+
+  /** Extract zip/jar artifact content into a target dir. */
+  def extractArtifact(zip: File, dir: File,
+    filter: NameFilter = AllPassFilter, flatten: Boolean = false): Set[java.io.File] =
+    {
+      IO createDirectory dir
+      if (flatten) {
+        /** Remove original directory structure. */
+        val tmp = IO createTemporaryDirectory
+        val sourceList = IO unzip (zip, tmp, filter)
+        val targetList = for {
+          source <- sourceList
+        } yield {
+          val target = dir / source.name
+          IO copyFile (source, target)
+          target
+        }
+        IO delete tmp
+        targetList
+      } else {
+        /** Prserve original directory structure. */
+        IO unzip (zip, dir, filter)
+      }
+    }
+
+}