#!/bin/bash
set -e

function process_lib {
	pushd ~/locallib 1>/dev/null
		if [ $(ls lib/p*/ |wc -w) -eq 1 ]
		then
			# seems to be arichtecturalsub dir
			arch_dir=$(ls lib/p*/)
			cd lib/p*/
			mv $arch_dir/* .
			rmdir $arch_dir
			cd ../..
		fi
		
		# check, if there is a real archtecturel depandence
		shared_lib=$(find . -name "*.so")
		if [ -n "$shared_lib" ]
		then
			arch=$(arch)
		fi			
	popd 1>/dev/null
	mv ~/locallib/lib $name/usr/
}

usage="cpan2deb <module>"

if [ $# -ne 1 ]; then
	echo $usage
	exit 1
fi

#cd $HOME
if [ -d locallib ]; then
	rm -rf locallib
fi
#if [ -d build ]; then
#	rm -rf build
#fi

start_dir=$(pwd)

echo "call CPAN ..."
cpan -m $1 1>$start_dir/cpan.out 2>&1 || (echo "cpan failed"; exit 1)

# find build directory
mname=$1
name=lib${mname/::/-}-perl
name=${name,,*}
builddir=$(ls -rtd ~/.cpan/build/*/ |tail -1)

pushd $builddir 1>/dev/null
	perl Makefile.PL INSTALL_BASE="~/locallib"
	make
	make install 1>>~/cpan.out 2>&1
	echo "Module $1 installed to ~/locallib, output written to $start_dir/cpan.out"
popd 1>/dev/null

arch=all

# move locallib content
mkdir -p $name/usr/

for dir in $(ls ~/locallib); do
	case $dir in
	lib) process_lib
	;;
	share) mv ~/locallib/share $name/usr/
	;;
	man) mv ~/locallib/man $name/usr/
	;;
	esac
done

# check version
export PERL5LIB="$start_dir/$name/usr/lib/perl5:$PERL5LIB"
version=$(perl -M$mname -e 'print $ARGV[0]->VERSION' $mname)

arch_name=""
if [ "$arch" != "all" ]
then
	arch_name="_$arch"
	if [ "$arch" = "i686" ]
	then
		# i686-Paketarchitektur gibt es nicht
		arch="i386"
	fi
fi

mkdir -p $name/DEBIAN
cat << EOF >$name/DEBIAN/control
Package: $name
Version: $version
Section: base
Priority: optional
Architecture: $arch
Depends:
Maintainer: WagnerTech UG <mail@wagnertech.de>
Description: $1 perl modul
EOF

fakeroot dpkg-deb --build $name
cp $name.deb ${name}_$version$arch_name.deb
echo "${name}_$version$arch_name.deb erstellt."