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optimize-jar.sh
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optimize-jar.sh
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#!/bin/bash
convert() {
local OUT=$3
local IN=$1
local TMP_OUT=$2
echo converting "$IN" to "$OUT"
unzip -d "$TMP_OUT" "$IN" > /dev/null
pushd . > /dev/null
# shellcheck disable=SC2164
cd "$2"
find . -type f | sort | zip -q -X -9 -@ "$OUT" > /dev/null
advzip -3 -z -i 1 "$OUT" > /dev/null
# shellcheck disable=SC2164
popd > /dev/null
}
if [[ "x$1" == "x" ]]; then
echo "source jar not specified"
exit 1
fi
if [[ "x$2" == "x" ]]; then
echo "root dir not specified"
exit 1
fi
mkdir "$2/jaropt/" > /dev/null
UNPACK_DIR=$(mktemp -d "$2/jaropt/XXXXXXXXXX")
TMP_OUTPUT_DIR=$(mktemp -d "$2/jaropt/XXXXXXXXXX")
JAR_NAME=$(basename "$1")
convert "$1" "$UNPACK_DIR" "$TMP_OUTPUT_DIR/$JAR_NAME"
ORGSIZE=$(stat --printf "%s" "$1")
NEWSIZE=$(stat --printf "%s" "$TMP_OUTPUT_DIR/$JAR_NAME")
PERCENT=$(awk -vo="$ORGSIZE" -vn="$NEWSIZE" 'BEGIN { printf("%.3f", n/o*100)}')
echo "$ORGSIZE -> $NEWSIZE or $PERCENT%"
mv "$TMP_OUTPUT_DIR/$JAR_NAME" "$1"
rm -rf "$UNPACK_DIR" "$TMP_OUTPUT_DIR"