JetBrains IDE JVM Version Change.

jetbrains_jvm_change.sh

#!/usr/bin/env bash
set -e

if [ -z "$1" ]; then
    echo "Must specify app name as argument; exiting"
    exit
fi

APP_NAME=`echo "$1" | tr '[:upper:]' '[:lower:]'` # convert to lowercase

case "$APP_NAME" in
    intellij)
        echo "Changing Java version for IntelliJ 14"
        APP_PREF_DIR='IntelliJIdea14'
        APP_INSTALL_DIR='IntelliJ IDEA 14.app'
        ;;
    rubymine) 
        echo "Changing Java version for RubyMine 7"
        APP_PREF_DIR='RubyMine70'
        APP_INSTALL_DIR='RubyMine.app'
        ;;
    pycharm)
        echo "Changing Java version for PyCharm 4"
        APP_PREF_DIR='PyCharm40'
        APP_INSTALL_DIR='PyCharm.app'
        ;;
    androidstudio)
        echo "Changing Java version for Android Studio 1.5"
        APP_PREF_DIR='AndroidStudio1.5'
        APP_INSTALL_DIR='Android Studio.app'
        ;;
    webstorm)
        echo "Changing Java version for WebStorm 10"
        APP_PREF_DIR='WebStorm10'
        APP_INSTALL_DIR='WebStorm.app'
        ;;
    clion)
        echo "Changing Java version for CLion 1.1"
        APP_PREF_DIR='clion11'
        APP_INSTALL_DIR='CLion.app'
        ;;
    *)
        echo "Must specify a valid application; exiting"
        exit
        ;;
esac

# Get the java version, quit if it's not found
JAVA_VERSION=`java -version 2>&1 | head -n 1 | cut -d\" -f 2 | cut -c1-3`
if [ -z "$JAVA_VERSION" ]; then
  echo "Unable to determine Java version; exiting"
  exit
fi

# Create the preferences directory
mkdir -p "$HOME/Library/Preferences/$APP_PREF_DIR"

# Copy the original idea.properties file (maintains app signing for patches/updates)
cp "/Applications/$APP_INSTALL_DIR/Contents/bin/idea.properties" "$HOME/Library/Preferences/$APP_PREF_DIR/"

# Replace the JVM version with the one we actually use
sed -i.bak "s/JVMVersion=.*/JVMVersion=$JAVA_VERSION*/g" "$HOME/Library/Preferences/$APP_PREF_DIR/idea.properties"