Bulletproof Scala REPL that works on all platforms with bash and includes current project classes like SBT console

scala

#!/bin/bash
# Author Mike Slinn
# 
# Requires JAVA_HOME to be set
#
# Invoke scalac with latest Scala 2.9.1 and Akka 2.0 jars, and Include SBT/Maven compiled project
# classes if invoked from root of an SBT/Maven project
# Does not use SBT or scala scripts, so this actually works on all platforms that have bash, 
# including Mac, Linux and Cygwin.
# Invoke scala as usual with all options except classpath.
# Enter REPL as usual without any args:
#   scala 
# You can add to the classpath with -cp, if that option is provided first:
#   scala -cp org.apache.httpcomponents/httpclient/jars/
# The additions to the classpath are assumed to exist in the ~.ivy2/cache and must end with /jars/
# The latest jar in that directory will be used
# See the final few entries to learn how to add arbitrary jars to the classpath

if [ $OSTYPE == cygwin ]; then
  DELIM=";"
  DHOME=`cygpath -dmas "$HOMEDRIVE$HOMEPATH"`
  IVY=$DHOME/.ivy2/cache
else
  IVY=~/.ivy2/cache
  DELIM=:
fi

function D {
  if [ "$CP" != "" ]; then 
    echo "$DELIM"
  else
    echo ""
  fi
}

# Only includes jars in the classpath that exist in the local .ivy2 repo 
function newest {
  if [ -d "$IVY/${1}" ]; then
    for f in $(ls -1t $IVY/${1}*.jar); do JAR=$f; done
      if [ -f "$JAR" ]; then echo "$(D)$JAR"; fi
  fi
}

# Include SBT/Maven compiled project classes if invoked from root of project
if [ -d target/scala-2.9.1/classes ]; then
  CP=target/scala-2.9.1/classes
fi

# getopts is broken under cygwin :(
while [ "$1" == -cp ]; do
  shift
  CP=$CP$(D)$(newest $1)
  shift
done

CP=$CP$(newest org.fusesource.jansi/jansi/jars/)
CP=$CP$(newest com.typesafe.akka/akka-actor/jars/)
CP=$CP$(newest org.scala-lang/scala-library/jars/)
CP=$CP$(newest com.github.scala-incubator.io/scala-io-core_2.9.1/jars/)
CP=$CP$(newest com.github.scala-incubator.io/scala-io-file_2.9.1/jars/)
CP=$CP$(newest org.scala-tools/scala-stm_2.9.1/jars/)
CP=$CP$(newest org.scala-lang/jline/jars/)
CP=$CP$(newest org.scala-lang/scala-compiler/jars/)
CP=$CP$(newest org.scala-lang/scala-library/jars/)
CP=$CP$(newest org.scala-lang/scalap/jars/)
CP=$CP$(newest commons-codec/commons-cli/jars/)
CP=$CP$(newest commons-codec/commons-codec/jars/)
CP=$CP$(newest commons-io/commons-io/jars/)
CP=$CP$(newest commons-logging/commons-logging/jars/)
CP=$CP$(newest commons-management/commons-management/jars/)
CP=$CP$(newest commons-pool/commons-pool/jars/)
CP=$CP$(newest org.multiverse/multiverse-alpha/jars/)

# not sure of the paths for these, so using original typesafe versions
CP=$CP$(D)/opt/typesafe-stack/lib/scala-swing.jar
CP=$CP$(D)/opt/typesafe-stack/lib/scala-dbc.jar
CP=$CP$(D)resources/application.conf

if [ "$VERBOSE" ]; then echo $CP; fi

JAVA_OPTS="-Xmx256M -Xms32M"

"$JAVA_HOME/bin/java" \
  $JAVA_OPTS \
  -Dscala.usejavacp=true -Dscala.home=/opt/typesafe-stack -Denv.emacs= \
  -Xbootclasspath/a:$CP \
  scala.tools.nsc.MainGenericRunner "$@"