#!/bin/sh

if [ $# -gt 0 -a "$1" = "-v" ]
then
    RETROFLAG="false"
    JARFLAG="v"
    shift
    set -x
fi 

if [ $# -ne 1 ]
then
    echo Provide on jar file to convert on the command line.
    exit 1
fi

REALPATH=$(realpath $0)
BIN_DIR=`dirname "$REALPATH"`
LIB_DIR=$BIN_DIR

JAR_TO_CONVERT="$1"
INPUT_DIR="$JAR_TO_CONVERT".inputdir
OUTPUT_DIR="$JAR_TO_CONVERT".outputdir

rm -rf "$INPUT_DIR"
rm -rf "$OUTPUT_DIR"
mkdir "$INPUT_DIR"
mkdir "$OUTPUT_DIR"
(cd "$INPUT_DIR"; jar -x${JARFLAG}f $OLDPWD/"$JAR_TO_CONVERT")

echo "Converting..."
java \
    -Dretrolambda.bytecodeVersion=49          \
    -Dretrolambda.defaultMethods=true         \
    -Dretrolambda.inputDir="$INPUT_DIR"       \
    -Dretrolambda.outputDir="$OUTPUT_DIR"     \
    -Dretrolambda.classpath="$JAR_TO_CONVERT" \
    -Dretrolambda.javacHacks=true             \
    -Dretrolambda.quiet=${RETROFLAG:-true}    \
    -jar "$LIB_DIR"/retrolambda-2.5.6.jar

# The order of the "m" and "f" must match the order that the
# corresponding files appear in the argument list. This is
# so stupid...
NEW_JAR_NAME="${JAR_TO_CONVERT%.jar}-java5.jar"
echo "Repackaging to ${NEW_JAR_NAME}"
jar -c${JARFLAG}fm "${NEW_JAR_NAME}" \
    "$OUTPUT_DIR"/META-INF/MANIFEST.MF \
    -C "$OUTPUT_DIR" .