sbt-install

#!/bin/bash

die () {
    echo "$1"
    exit 1
}

print_usage () {
    read -d '' USAGE << EOF
Usage:
  sbt-install [options] VERSION

OPTIONS:
  -d                Directory sbt will be installed
  --xms             Minimum heap size
  --xmx             Maximum heap size
  --xss             Thread stack size
  --ivy-home        Set sbt.ivy.home
  --help            show this message

EOF

    echo "$USAGE"
}

INSTALL_DIR=$HOME/bin
SBT_IVY_HOME='${HOME}/.ivy2'
XMS=512M
XMX=1536M
XSS=1M

while [ "$#" -gt 0 ]; do
    case "$1" in
        -d)
            INSTALL_DIR=$2
            shift
            shift
            ;;
        --ivy-home)
            SBT_IVY_HOME=$2
            shift
            shift
            ;;
        --xms)
            XMS=$2
            shift
            shift
            ;;
        --xmx)
            XMX=$2
            shift
            shift
            ;;
        --xss)
            XSS=$2
            shift
            shift
            ;;
        --help)
            print_usage
            exit 0
            ;;
        *)
            VERSION=$1
            shift
            ;;
    esac
done

test -n "$VERSION" || die "VERSION is required."

mkdir $INSTALL_DIR > /dev/null 2>&1

cd $INSTALL_DIR

if [ -f $INSTALL_DIR/sbt ]; then
    read -p "$INSTALL_DIR/sbt already exists. Overwrite? [y/n]" -n 1 -r
    if [[ $REPLY =~ ^[Nn]$ ]]; then
        exit 0
    fi
fi

TYPESAFE_REPO=https://dl.bintray.com/sbt/maven-releases/org/scala-sbt/sbt-launch
JAR_URL=$TYPESAFE_REPO/${VERSION}/sbt-launch.jar
JAR=sbt-launch-${VERSION}.jar

echo "Downloading $JAR from $JAR_URL"

curl -L -f -o $JAR $JAR_URL
if [ $? -ne 0 ]; then
    rm $JAR
    die "ERROR: $JAR not found"
fi

read -d '' SCRIPT <<EOF
#!/bin/sh
java -Dfile.encoding=utf-8 -Xms${XMS} -Xmx${XMX} -Xss${XSS} -XX:+CMSClassUnloadingEnabled -Dsbt.ivy.home=${SBT_IVY_HOME} -jar \`dirname \$0\`/sbt-launch-${VERSION}.jar "\$@"
EOF
echo "$SCRIPT" > sbt

chmod +x sbt

echo "Successfully installed at $INSTALL_DIR/sbt"