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#!@BASH_SHELL@
#
#   pkgdelta - create delta files for use with pacman and repo-add
#   @configure_input@
#
#   Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# bash options
set -o nounset
set -o errexit

# gettext initialization
export TEXTDOMAIN='pacman'
export TEXTDOMAINDIR='@localedir@'

myver='@PACKAGE_VERSION@'

QUIET=0

# ensure we have a sane umask set
umask 0022

msg() {
        (( QUIET )) && return
        local mesg=$1; shift
        printf "==> ${mesg}\n" "$@" >&1
}

warning() {
        local mesg=$1; shift
        printf "==> $(gettext "WARNING:") ${mesg}\n" "$@" >&2
}

error() {
        local mesg=$1; shift
        printf "==> $(gettext "ERROR:") ${mesg}\n" "$@" >&2
}

# print usage instructions
usage() {
        printf "pkgdelta (pacman) %s\n\n" "$myver"
        printf "$(gettext "Usage: pkgdelta [-q] <package1> <package2>\n")"
        printf "$(gettext "\
        pkgdelta will create a delta file between two packages\n\
This delta file can then be added to a database using repo-add.\n\n")"
        echo "$(gettext "Example:  pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")"
}

version() {
        printf "pkgdelta (pacman) %s\n\n" "$myver"
        printf "$(gettext "\
Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>.\n\n\
This is free software; see the source for copying conditions.\n\
There is NO WARRANTY, to the extent permitted by law.\n")"
}

read_pkginfo()
{
        pkgname= pkgver= arch=
        local OLDIFS=$IFS
        # IFS (field separator) is only the newline character
        IFS="
"
        local line var val
        for line in $(bsdtar -xOf "$1" .PKGINFO 2>/dev/null |
                grep -v "^#" | sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do
                eval "$line"
                if [[ -n $pkgname && -n $pkgver && -n $arch ]]; then
                        IFS=$OLDIFS
                        return 0
                fi
        done
        IFS=$OLDIFS
        error "$(gettext "Invalid package '%s'")" "$1"
        return 1
}

# $oldfile $oldmd5 $newfile $newmd5 $deltafile $deltamd5 $deltasize
create_xdelta()
{
        local oldfile=$1
        local newfile=$2
        local \
        oldname oldver oldarch \
        newname newver newarch \
        deltafile

        read_pkginfo "$oldfile" || return 1
        oldname="$pkgname"
        oldver="$pkgver"
        oldarch="$arch"
        read_pkginfo "$newfile" || return 1
        newname="$pkgname"
        newver="$pkgver"
        newarch="$arch"

        if [[ $oldname != $newname ]]; then
                error "$(gettext "The package names don't match : '%s' and '%s'")" "$oldname" "$newname"
                return 1
        fi

        if [[ $oldarch != $newarch ]]; then
                error "$(gettext "The package architectures don't match : '%s' and '%s'")" "$oldarch" "$newarch"
                return 1
        fi

        if [[ $oldver == $newver ]]; then
                error "$(gettext "Both packages have the same version : '%s'")" "$newver"
                return 1
        fi

        msg "$(gettext "Generating delta from version %s to version %s")" "$oldver" "$newver"
        deltafile="$(dirname $newfile)/$pkgname-${oldver}_to_${newver}-$arch.delta"
        local ret=0

        xdelta3 -q -f -s "$oldfile" "$newfile" "$deltafile" || ret=$?
        if (( ret )); then
                error "$(gettext "Delta could not be created.")"
                return 1
        else
                msg "$(gettext "Generated delta : '%s'")" "$deltafile"
                (( QUIET )) && echo "$deltafile"
        fi
        return 0
}

case "$1" in
        -q|--quiet) QUIET=1; shift ;;
esac

if (( $# != 2 )); then
        usage
        exit 0
fi

if [[ ! -f $1 ]]; then
        error "$(gettext "File '%s' does not exist")" "$1"
        exit 0
fi

if [[ ! -f $2 ]]; then
        error "$(gettext "File '%s' does not exist")" "$2"
        exit 0
fi

if ! type xdelta3 &>/dev/null; then
        error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
        exit 1
fi

create_xdelta "$1" "$2"