ringo.sh

#!/bin/bash
# Launches RingoJS

#
# find_home - manually emulate GNU's `readlink -f`
#
function find_home() {
    # save original working directory
    ORIG_PWD="$(pwd -P)"

    # walk the links! we cd into the dir of the binary, read the link target,
    # make this link our new binary, and start over. we stop as soon as the
    # binary is no link anymore.
    T="$1"
    while true; do
        cd "$(dirname "$T")"
        T="$(basename "$T")"
        if [ ! -L "$T" ]; then
            break
        fi
        T="$(readlink "$T")"
    done

    # the final target is in bin/, change to parent and echo as home
    cd ..
    echo "$(pwd -P)"

    # restore original working directory
    cd "$ORIG_PWD"
}

if [ -z "$RINGO_HOME" ]; then
    RINGO_HOME="$(find_home "$0")"
fi

# prepend rhino to bootclasspath to work around openjdk bug
java -Xbootclasspath/p:"$RINGO_HOME/lib/js.jar" -jar "$RINGO_HOME/run.jar" "$@"