Start sbt projects quickly

newsbt

#! /bin/bash
# newsbt -- create a new sbt project

# Change this to generate projects using a different version of Scala
# You can override it with the -s option
scala_version=2.10.2

# I always use this namespace even though I don't own the domain name :)
# You can override it with the -n option
base_namespace=com.timjstewart

# Creates an sbt sub-project
make_project() {
	project=$1

	mkdir -p ${name}/${project}/src/{main,test}/scala/${sub_dirs}

	# Generate Main.scala
	cat <<-EOF >> ${name}/${project}/src/main/scala/${sub_dirs}/Main.scala
package ${base_namespace}

object Main extends App {
  override def main(args: Array[String]): Unit = {
    println("Hello, World!")
  }
}
EOF

	# Generate Test.scala
	cat <<-EOF >> ${name}/${project}/src/test/scala/${sub_dirs}/Test.scala
package ${base_namespace}

import org.scalacheck._
import org.scalacheck.Prop.forAll

object Test extends Properties("Test") {
  property("first") = forAll((n:Int) => n == n)
}
EOF
        # Generate project build.sbt
	cat <<-EOF >> ${name}/${project}/build.sbt
// build.sbt for ${project}
name := "${project}"

resolvers ++= Seq(
  "Sonatype Snapshots" at "http://oss.sonatype.org/content/repositories/snapshots",
  "Sonatype Releases"  at "http://oss.sonatype.org/content/repositories/releases"
)

libraryDependencies ++= Seq(
  "org.scalacheck" %% "scalacheck" % "1.10.1" % "test",
  "org.scalatest" % "scalatest_2.10" % "2.0.RC2" % "test",
  "com.netflix.rxjava" % "rxjava-scala" % "0.14.8",
  "log4j" % "log4j" % "1.2.17"
)
EOF
}

while getopts ":s:n:" opt
do
    case $opt in
	s)
	    scala_version=${OPTARG}
	    ;;
	n) 
	    base_namespace=${OPTARG}
	    ;;
	*)
	    echo "unknown command" 2>&1
	    exit 2
	    ;;
	esac
done

shift $(($OPTIND-1))

# Convert namespace into subdirectories
sub_dirs=$(echo ${base_namespace} | tr '.' '/' | tr ' ' '_' | tr '[:upper:]' '[:lower:]')

if [ $# -lt 2 ]
then
	echo "usage: newsbt OPTIONS NAME PROJECT ..." 1>&2
	echo "  -s SCALA_VERSION" 1>&2
	echo "  -n NAMESPACE" 1>&2

	exit 1
fi

name=$1
shift

if [ -d ./${name} ]
then
	echo "A directory named ${name} already exists in this diretory" 1>&2
	exit 1
fi

mkdir ${name}

cat << SBT >> ${name}/build.sbt
// build.sbt for ${name}

scalaVersion := "${scala_version}"

sbtVersion := "0.13.0"

SBT

for project in $*
do
	make_project ${project}

	# Add a reference to each project to the main build.sbt
	echo >> ${name}/build.sbt

	echo "lazy val ${project} = project" >> ${name}/build.sbt
done

# add a newline to the end of the main build.sbt file
echo >> ${name}/build.sbt