Create a full Scala distribution from sbt

This replicates the results of `ant -Dlocker.skip=1 distpack` with the
following differences:

- The POM files produced by the ant build under dists/maven still
  contain unresolved variables like `@VERSION@`. The ant build resolves
  them in the actual publishing process. The sbt build generates the
  correct version numbers directly.

- Scaladoc sets in the ant build are created with the scaladoc tool from
  “quick”. The sbt build uses the STARR scaladoc.

- The scaladoc sets for scala-actors, scala-compiler, scala-reflect and
  scalap from the ant build contain documentation for the classes
  `Null`, `Nothing`, `Any` and `AnyRef`. The sbt build omits those
  classes from all doc sets (except for scala-library, of course) under
  the assumption that this is a bug in the ant build.

Other idiosyncracies of the ant build like declaring a packaging type of
`jar` (instead of `bundle`) for OSGi bundles, or using slightly
different module names and descriptions in scaladocs, OSGi bundles and
POMs, are reproduced faithfully for now.

Publishing from the sbt build is done in the usual sbt way. No actual
publishing targets are currently defined in the build. In order to test
stability of the publishing process, the `publishDists` task can be used
to publish to dists/maven-sbt with the same directory layout and naming
conventions employed by the ant build for publishing to dists/maven.

Source and binary JARs are OSGi-enabled. For the source JARs this is
done by hand-crafting the appropriate MANIFEST.MF entries (like the ant
build does). Binary JARs are packaged with BND, using the same outdated
BND version as the ant build for now to get identical results. We do not
use sbt-osgi because it depends on a newer version of BND (probably OK
to upgrade in the future) and does not allow a crucial bit of
configuration that we need: Setting the classpath for BND. In sbt-osgi
this is always `fullClasspath in Compile` whereas we really want
`products in Compile in packageBin` to keep things simple.

Conflicts:
	build.sbt

2 files changed, 71 insertions, 0 deletions

diff --git a/project/Osgi.scala b/project/Osgi.scala
new file mode 100644
index 0000000000..78370b695b
--- /dev/null
+++ b/project/Osgi.scala
@@ -0,0 +1,69 @@
+import aQute.bnd.osgi.Builder
+import aQute.bnd.osgi.Constants._
+import java.util.Properties
+import sbt._
+import sbt.Keys._
+import scala.collection.JavaConversions._
+import VersionUtil.versionProperties
+
+/** OSGi packaging for the Scala build, distilled from sbt-osgi. We do not use sbt-osgi because it
+  * depends on a newer version of BND which gives slightly different output (probably OK to upgrade
+  * in the future but for now it would make comparing the sbt and ant build output harder) and does
+  * not allow a crucial bit of configuration that we need: Setting the classpath for BND. In sbt-osgi
+  * this is always `fullClasspath in Compile` whereas we want `products in Compile in packageBin`. */
+object Osgi {
+  val bundle = TaskKey[File]("osgiBundle", "Create an OSGi bundle.")
+  val bundleName = SettingKey[String]("osgiBundleName", "The Bundle-Name for the manifest.")
+  val bundleSymbolicName = SettingKey[String]("osgiBundleSymbolicName", "The Bundle-SymbolicName for the manifest.")
+  val headers = SettingKey[Seq[(String, String)]]("osgiHeaders", "Headers and processing instructions for BND.")
+
+  def settings: Seq[Setting[_]] = Seq(
+    bundleName := description.value,
+    bundleSymbolicName := organization.value + "." + name.value,
+    headers := {
+      val v = VersionUtil.versionProperties.value.osgiVersion
+      Seq(
+        "Bundle-Name" -> bundleName.value,
+        "Bundle-SymbolicName" -> bundleSymbolicName.value,
+        "ver" -> v,
+        "Export-Package" -> ("*;version=${ver}"),
+        "Import-Package" -> ("scala.*;version=\"${range;[==,=+);${ver}}\",*"),
+        "Bundle-Version" -> v,
+        "Bundle-RequiredExecutionEnvironment" -> "JavaSE-1.8",
+        "-eclipse" -> "false"
+      )
+    },
+    bundle <<= Def.task {
+      val res = (products in Compile in packageBin).value
+      bundleTask(headers.value.toMap, (products in Compile in packageBin).value,
+        (artifactPath in (Compile, packageBin)).value, res, streams.value)
+    },
+    packagedArtifact in (Compile, packageBin) <<= (artifact in (Compile, packageBin), bundle).identityMap,
+    // Also create OSGi source bundles:
+    artifact in (Compile, packageBin) ~= (_.copy(`type` = "bundle")),
+    packageOptions in (Compile, packageSrc) += Package.ManifestAttributes(
+      "Bundle-Name" -> (description.value + " Sources"),
+      "Bundle-SymbolicName" -> (bundleSymbolicName.value + ".source"),
+      "Bundle-Version" -> versionProperties.value.osgiVersion,
+      "Eclipse-SourceBundle" -> (bundleSymbolicName.value + ";version=\"" + versionProperties.value.osgiVersion + "\";roots:=\".\"")
+    )
+  )
+
+  def bundleTask(headers: Map[String, String], fullClasspath: Seq[File], artifactPath: File,
+                 resourceDirectories: Seq[File], streams: TaskStreams): File = {
+    val log = streams.log
+    val builder = new Builder
+    builder.setClasspath(fullClasspath.toArray)
+    headers foreach { case (k, v) => builder.setProperty(k, v) }
+    val includeRes = resourceDirectories.filter(_.exists).map(_.getAbsolutePath).mkString(",")
+    if(!includeRes.isEmpty) builder.setProperty(INCLUDERESOURCE, includeRes)
+    builder.getProperties.foreach { case (k, v) => log.debug(s"bnd: $k: $v") }
+    // builder.build is not thread-safe because it uses a static SimpleDateFormat.  This ensures
+    // that all calls to builder.build are serialized.
+    val jar = synchronized { builder.build }
+    builder.getWarnings.foreach(s => log.warn(s"bnd: $s"))
+    builder.getErrors.foreach(s => log.error(s"bnd: $s"))
+    jar.write(artifactPath)
+    artifactPath
+  }
+}
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 862887d57f..02d66a16dd 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,3 +1,5 @@
 libraryDependencies += "org.apache.commons" % "commons-lang3" % "3.3.2"
 
 libraryDependencies += "org.pantsbuild" % "jarjar" % "1.6.0"
+
+libraryDependencies += "biz.aQute.bnd" % "biz.aQute.bnd" % "2.4.1"