#!/bin/bash
# Description: This shell script used to generate patch file
#      Author: guowenxue <guowenxue@gmail.com>
#     Version: 1.0.0  

PROJ_PATH=`pwd`

PATCH_PATH=${PROJ_PATH}/patches

BOARD=imx6ull
PATCH_SUFFIX=${BOARD}.patch

set -e


if [ $# != 1 ] ; then
    echo "Usage: $0 [src_path]"
    printf "\nExample: \n"
    echo "$0 lvgl-8.0.2"

    exit ;
fi


SRC=`basename $1`

if [ ! -d ${SRC} ] ; then
    printf "\nERROR: ${SRC} source code not exist, exit now\n\n"
    exit
fi

if [ ! -f ${SRC}.tar.gz ] ; then
    printf "\nERROR: ${SRC}.tar.gz packet not exist, exit now\n\n"
    exit
fi

rm -rf ${SRC}/build

# rename new source code
mv ${SRC} ${SRC}-${BOARD}

# decompress orignal soruce code packet
tar -xzf ${SRC}.tar.gz

set +e

# generate patch file 
diff -Nuar ${SRC} ${SRC}-${BOARD} > ${SRC}-${PATCH_SUFFIX}

# remove orignal soruce code
rm -rf ${SRC}

# recover new source code
mv ${SRC}-${BOARD} ${SRC}