#!/bin/bash
set -e

function echo_usage {
	echo "usage: configure <package> [options]"
	echo "	-a <arch>"
}

function set_build {
	if [ -e .svn ]
	then
		build=$(svnversion)
	elif [ -e .git ]
	then
		build=$(git describe --tags 2>/dev/null)
		test -n "$build" || build="TOP"
		changes=$(git status -s |grep "^ *M") || true
		test -z "$changes" || build="${build}M"
	fi
}

# to build a package you need ...
# <package>.cp (optional): copy step for package production
# <package>.cpp.sh (optional): commands to setup the C++ compile environment

if [ $# -lt 1 ]
then
	echo_usage
	exit 1
fi

paket=$1
shift
ARCH=""
cpp_build=0
delete_src=1

set_build
echo "building $paket with build $build"

while getopts ":a" opt; do
	case $opt in
		a) ARCH=$OPTARG
			;;
		\?) echo "Invalid option: -$OPTARG"
			echo_usage
			exit 1
			;;
		:) echo "Option -$OPTARG requires an argument."
			echo_usage
			exit 1
			;;
	esac
done

# clean dirs and check out
if [ -d build -a $delete_src -eq 1 ]
then
	rm -rf build
fi

mkdir -p build
pushd build >/dev/null

ln -sf /usr/share/mbuild/makefile .

if [ -e $paket ]
then
	rm -rf $paket
fi
rm *.stamp || true
rm make.pre || true

# load util functions for C/C++ - build
if [ -f $paket.cpp.sh ]
then
	cpp_build=1
	. projects/tools/make/c_configure.sh
	. $paket.cpp.sh
fi

# copy package control
control=$(find -L src -name $paket.control)
build_number=${build#*_}
if [ -z "$control" ]
then
	echo "warning: control file not found"
	echo "  this file is necessary for any package production."
else	
	sed "s/%BUILD%/$build_number/" $control |sed "s/%ARCH%/$ARCH/" >$paket.control
	echo "$paket.control written."

	# extract version
	version=$(grep Version $paket.control |sed "s/Version: //")
fi

# check for copy file
copy=$(find -L src -name $paket.cp)
if [ -n "$copy" ]
then
	ln -sf $copy .
else
	echo "warning: file $paket.cp missing or not executable:"
	echo "  this file is necessary for any package production."
fi

# check for installation scripts
files=$(find src -name $paket.preinst)
files="$files $(find -L src -name $paket.postinst)"
files="$files $(find -L src -name $paket.prerm)"
files="$files $(find -L src -name $paket.postrm)"
for file in $files
do
	ln -sf $file .
done

# create generic make.pre, if not existing
if [ ! -f make.pre ]
then
	cat  >>make.pre <<MAKE_PRE
# mBuild make.pre script (auto generated)
project = $paket
COPY = ./$paket.cp
MAKE_PRE
	if [ -n "$ARCH" ]
	then
		echo "arch = $ARCH" >>make.pre
		echo "_arch = _${ARCH}" >>make.pre
	fi
	echo "make.pre written."
fi

# append version to make.pre
echo "version = $version" >> make.pre
echo "build = $build" >> make.pre