i2b2-merge-to…

AbstractArgParser.scala
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			package net.shrine.utilities.scallop

			import org.rogach.scallop.ScallopConf
			import net.shrine.util.Versions

			/**
			* @author clint
			* @date Jul 21, 2014
			*/
			abstract class AbstractArgParser(override val args: Seq[String]) extends ScallopConf(args) {

			final val showVersionToggle = toggle("version")

			final val showHelpToggle = toggle("help")

			final def shouldShowVersion = showVersionToggle.isSupplied

			final def shouldShowHelp = showHelpToggle.isSupplied

			//NB: Prevents Scallop from calling System.exit on any errors; override as needed
			override protected def onError(e: Throwable): Unit = {
			if (!args.isEmpty && !shouldShowHelp && !shouldShowVersion) {
			System.err.println(e.getMessage)
			}
			}

			private def exitAfter(f: => Any): Unit = { f ; System.exit(0) }

			def showVersion(appName: String): Unit = println(Versions.versionString(appName))

			def showVersionAndExit(appName: String): Unit = exitAfter { showVersion(appName) }

			def showHelp(appName: String): Unit = { showVersion(appName) ; printHelp() }

			def showHelpAndExit(appName: String): Unit = exitAfter { showHelp(appName) }
			}