#!/bin/sh

# Copyright (C) 2008-2013 Red Hat, Inc
# Author: Jens Petersen <petersen@redhat.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 3 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/>.

set -e

# use -l to force lib package
if getopts l opt; then
  shift
  case $opt in
      l) FORCE_LIB=-l
	  ;;
  esac
fi

if [ $# -ne 1 ]; then
    echo "Usage: $(basename $0) [-l] [hackage|hackage.tar.gz|hackage.cabal]"
    echo "  -l      assume BinLib package is Lib"
    exit 1
fi

case $0 in
    /*) CBLRPM=$(dirname $0)/cblrpm ;;
    *) CBLRPM=cblrpm ;;
esac

PKG=$1

WORKDIR=$(mktemp --tmpdir=. -d)

cd $WORKDIR

if [ ! -r ../$PKG ]; then
    $CBLRPM -v0 $FORCE_LIB spec $PKG
elif ! $CBLRPM -v0 $FORCE_LIB spec ../$PKG; then
    cd ..
    rm -r $WORKDIR
    exit 1
fi

SPECFILE=$(ls *.spec)

cd ..

if [ ! -r "$SPECFILE" ]; then
  echo "No $SPECFILE file found in current directory"
  rm -r $WORKDIR
  exit 1
fi

diff -uw $WORKDIR/$SPECFILE $SPECFILE | sed -e "s%$WORKDIR/$SPECFILE%$SPECFILE.cblrpm%"

[ -d "$WORKDIR" ] && rm -r $WORKDIR