#!/bin/sh
#
# Runs Processing, using an already installed JDK if possible. 
# Otherwise, falls back to the local JDK that comes with Processing.
#


# JARs required from JDK (anywhere in/below the JDK home directory)
JDKLIBS="rt.jar tools.jar"

# Locates the required JARs in JDKDIR and saves them in JDKCP. Sets 
# SUCCESS to 1 if all JARs were found, to 0 otherwise.
make_jdkcp() {
  unset JDKCP
  SUCCESS=1
  for L in $JDKLIBS; do
    # Use the first JAR with a matching relative path
    LIB=`find "$JDKDIR" -name $L | head -n 1`
    JDKCP=${JDKCP+"$JDKCP":}"$LIB"
    [ -z "$LIB" ] && SUCCESS=0
  done
}

# Get absolute path of directory where this script is located
APPDIR=`readlink -f "$0"`
APPDIR=`dirname "$APPDIR"`

# Locate preferred system JRE/JDK home
JDKDIR=`which java` && JDKDIR=`readlink -e "$JDKDIR"` && JDKDIR=`dirname "$JDKDIR"`/..

# Back out of JRE directory if apparently located inside another JDK
if [ -f "$JDKDIR/../bin/java" ]; then
  JDKDIR="$JDKDIR/.."
fi

# Locate required JARs in JDK home
make_jdkcp

# Suitable system JDK found?
if [ $SUCCESS -ne 1 ]; then
  # No, use local JDK installation
  JDKDIR="$APPDIR/java"
  make_jdkcp
fi

# Add all required JARs to CLASSPATH
CLASSPATH="$CLASSPATH":"$JDKCP"
for LIB in "$APPDIR"/lib/*.jar; do
  CLASSPATH="$CLASSPATH":"$LIB"
done
export CLASSPATH

# Make all JDK binaries available in PATH
export PATH="$JDKDIR/bin":"$PATH"

# Start Processing in the same directory as this script
cd "$APPDIR"
java processing.app.Base