#!/bin/bash
#

#
# Licensed under GPLv2
#
# Version 0.2 - Ivo Teel
# http://www.labcoding.com
#

#
# This script updates your WordPress blog.
# a) from 2.3.1 to 2.3.2
# b) from 2.3.2 to 2.3.3
#
# TODO
# Expand this script to support many different WP versions and diff's.
#

WP_SUP=("2.3.1" "2.3.2")

while getopts d:s: name
do
    case $name in
    d)    WP_DST="$OPTARG";;
    s)    WP_SRC="$OPTARG";;
    ?)   printf "Usage: wp-upgrade -d destination [ -s source ]"
          exit 2;;
    esac
done

if [ ! ${WP_DST} ]; then
        echo "Usage: wp-upgrade -d destination [ -s source ]"
        exit 2
fi

if [ ! ${WP_SRC} ]; then
        WP_SRC="$HOME/wordpress"
fi

# Grab the latest version and unpack
echo ""
echo "Grabbing the latest version from WordPress.org"
echo ""

cd ~
rm -f ~/latest.tar.gz
wget http://wordpress.org/latest.tar.gz
rm -Rf ~/wordpress
tar -zxf latest.tar.gz

# Check the version of the source
wp_version=`grep '\$wp_version' ${WP_SRC}/wp-includes/version.php | cut -b 16-20`

echo "The downloaded version is ${wp_version}."

# Check destination version
wp_dversion=`grep '\$wp_version' ${WP_DST}/wp-includes/version.php | cut -b 16-20`

vernum=${#WP_SUP}
sup=0

# Check if we support this version
for ((i=0;i<$vernum;i++)); do
	if [ "${WP_SUP[${i}]}" == "${wp_dversion}" ]; then
		sup=1
	fi
done

if [ ${sup} -eq 0 ]; then
	echo ""
        echo "The version we have to upgrade at ${WP_DST} is not a supported version, it's ${wp_dversion}."
	echo ""
	echo "We support:"
	for ((i=0;i<$vernum;i++)); do
		echo "${WP_SUP[${i}]}"
	done
	echo "This script cannot continue."
        exit 2
fi

# Backup current site, just in case...
echo ""
echo "Creating backup of current WordPress files, just in case..."
echo ""
tar -zcf $HOME/wp-${wp_dversion}.tar.gz ${WP_DST}/

# Copy all files
echo "Copying changed files into ${WP_DST}"
echo ""
if [ "${wp_version}" == "2.3.2" ]; then
	cp ${WP_SRC}/wp-app.php ${WP_SRC}/wp-mail.php ${WP_SRC}/wp-settings.php ${WP_SRC}/xmlrpc.php ${WP_DST}
	cp ${WP_SRC}/wp-admin/admin.php ${WP_SRC}/wp-admin/install.php ${WP_SRC}/wp-admin/setup-config.php ${WP_DST}/wp-admin
	cp ${WP_SRC}/wp-includes/formatting.php ${WP_SRC}/wp-includes/functions.php ${WP_SRC}/wp-includes/pluggable.php ${WP_SRC}/wp-includes/post.php ${WP_SRC}/wp-includes/query.php ${WP_SRC}/wp-includes/taxonomy.php ${WP_SRC}/wp-includes/wp-db.php ${WP_SRC}/wp-includes/version.php ${WP_DST}/wp-includes
fi

if [ "${wp_version}" == "2.3.3" ]; then
	cp ${WP_SRC}/xmlrpc.php ${WP_DST}
	cp ${WP_SRC}/wp-admin/install-helper.php ${WP_DST}/wp-admin
	cp ${WP_SRC}/wp-includes/pluggable.php ${WP_SRC}/wp-includes/version.php ${WP_DST}/wp-includes/
fi

# Complete!
echo "Your blog has been updated from ${wp_dversion} to ${wp_version}! No running of update.php is needed for this release."