java_home wrapper for Mac OS X, adding support for jenv

Readme.md

java_home wrapper for Mac OS X, adding support for jenv

this script checks if a (global) version was set by jenv. if so, use that path if no version was requested explicitly (e.g. by java_home -v '1.7.*' or something)

# set env if not already done so. something like this for bash
echo "export JAVA_HOME=`/usr/libexec/java_home`" >> ~/.bash_profile;

# this should be brew install something, but for now...
curl 'https://gist.githubusercontent.com/duydao/9950734/raw/dff4d3bde816bfc0e9e11c4498a68c43800ae090/java_home' -o /usr/local/bin/java_home
chmod +x /usr/local/bin/java_home

# /usr/libexec is owned by root, so we have to sudo
sudo mv /usr/libexec/java_home /usr/libexec/java_home_orig
sudo ln -s /usr/local/bin/java_home /usr/libexec/java_home

# restart console or source ~/.bash_profile

java_home

#!/usr/bin/env bash
ORIG=/System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java_home

if [ -z "$JENV_ROOT" ]; then
    JENV_ROOT=~/.jenv
fi

if [ -f "$JENV_ROOT/version" ]; then
    CURRENT_VERSION=`/bin/cat $JENV_ROOT/version`
fi

if [ -z "$CURRENT_VERSION" ]; then
    exec $ORIG $@
fi

PATH="$JENV_ROOT/versions/$CURRENT_VERSION"
args=$@

while [ "$1" != "" ]; do
    case $1 in
        -a | --arch)
            shift
            arg_arch=$1
            ;;
        -d | --datamodel)
            shift
            arg_datamodel=$1
            ;;
        -v | --version)
            shift
            arg_version=$1
            ;;
        -V | --verbose)
            arg_verbose=1
            ;;
        *)
            break
            ;;
    esac
    shift
done

# reset args
set -- $args

# read version from jenv if no version was explicitly set
if [ -z "$arg_version" ]; then
    # no explicit version was set, use jenv
    # strip platform and arch from: oracle64-1.7.0_51
    v=${CURRENT_VERSION#*-}
    if [ -n "${v}" ]; then
        VERSION="$v"
    fi
fi

# wrap only if empty, arch or datamodel...
if [ $# -gt 0 ]; then
    if [ -n "$arg_arch" ] || [ -n "$arg_datamodel" ]; then
        if [ -z "$arg_version" ] && [ -n "$VERSION" ]; then
            exec $ORIG -v $VERSION "$@"
        else
            exec $ORIG "$@"
        fi
    else
        exec $ORIG "$@"
    fi
elif [ -d "$PATH" ]; then
    cd $PATH
    pwd -P
elif [ -f "$ORIG" ]; then
    exec $ORIG
fi