issue #963: build executable war with sbt, fetch jetty jars at build time.

executable.sbt

@@ -0,0 +1,77 @@
+val executableConfig	= config("executable").hide
+val executableKey		= TaskKey[File]("executable")
+
+Keys.ivyConfigurations		+= executableConfig
+libraryDependencies	++= Seq(
+	"org.eclipse.jetty"	%	"jetty-security"		% "8.1.16.v20140903"	% "executable",
+	"org.eclipse.jetty"	%	"jetty-webapp"			% "8.1.16.v20140903"	% "executable",
+	"org.eclipse.jetty"	%	"jetty-continuation"	% "8.1.16.v20140903"	% "executable",
+	"org.eclipse.jetty"	%	"jetty-server"			% "8.1.16.v20140903"	% "executable",
+	"org.eclipse.jetty"	%	"jetty-xml"				% "8.1.16.v20140903"	% "executable",
+	"org.eclipse.jetty"	%	"jetty-http"			% "8.1.16.v20140903"	% "executable",
+	"org.eclipse.jetty"	%	"jetty-servlet"			% "8.1.16.v20140903"	% "executable",
+	"org.eclipse.jetty"	%	"jetty-io"				% "8.1.16.v20140903"	% "executable",
+	"org.eclipse.jetty"	%	"jetty-util"			% "8.1.16.v20140903"	% "executable"
+)
+executableKey	:= {
+	import org.apache.ivy.util.ChecksumHelper
+	import java.util.jar.{ Manifest => JarManifest }
+	import java.util.jar.Attributes.{ Name => AttrName }
+	
+	val workDir	= Keys.target.value / "executable"
+	var warName	= Keys.name.value + "-" + Keys.version.value + "-executable.war"
+	
+	val log		= streams.value.log
+	log info s"building executable webapp in ${workDir}"
+	
+	// initialize temp directory
+	val temp	= workDir / "webapp"
+	IO delete temp
+	
+	// include jetty classes
+	val jettyJars	= Keys.update.value select configurationFilter(name = executableConfig.name)
+	jettyJars foreach { jar =>
+		IO unzip (jar, temp, (name:String) =>
+			(name startsWith "javax/") ||
+			(name startsWith "org/")
+		)
+	}
+	
+	// include original war file
+	val warFile	= (Keys.`package`).value
+	IO unzip (warFile, temp)
+	
+	// include launcher classes
+	val classDir		= (Keys.classDirectory in Compile).value
+	val launchClasses	= Seq("JettyLauncher.class" /*, "HttpsSupportConnector.class" */)
+	launchClasses foreach { name =>
+		IO copyFile (classDir / name, temp / name)
+	}
+	
+	// zip it up
+	IO delete (temp / "META-INF" / "MANIFEST.MF")
+	val contentMappings	= (temp.*** --- PathFinder(temp)).get pair relativeTo(temp)
+	val manifest		= new JarManifest
+	manifest.getMainAttributes put (AttrName.MANIFEST_VERSION,	"1.0")
+	manifest.getMainAttributes put (AttrName.MAIN_CLASS,		"JettyLauncher")
+	val outputFile		= workDir / warName
+	IO jar (contentMappings, outputFile, manifest)
+	
+	// generate checksums
+	Seq("md5", "sha1") foreach { algorithm =>
+		IO.write(
+			workDir / (warName + "." + algorithm),
+			ChecksumHelper computeAsString (outputFile, algorithm)
+		)
+	}
+	
+	// done
+	log info s"built executable webapp ${outputFile}"
+	outputFile
+}
+/*
+Keys.artifact in (Compile, executableKey) ~= {
+	_ copy (`type` = "war", extension = "war"))
+}
+addArtifact(Keys.artifact in (Compile, executableKey), executableKey)
+*/