#!/bin/sh

#
# display help screeen
#
help() {
cat << END
Usage: configure [options]
--prefix=DIR			set install prefix to DIR [$prefix]
--bindir=DIR			install executables in DIR [\$prefix/bin]
--datadir=DIR			install read-only data in DIR [\$prefix/share]
--includedir=DIR		install header files in DIR [\$prefix/include]
--libdir=DIR			install libraries in DIR [\$prefix/lib]
--mandir=DIR			install man pages in DIR [\$prefix/man]
--precision=NUMBER		aucat processing precision [$precision]
--enable-alsa			enable alsa backend [$alsa]
--disable-alsa			disable alsa backend
--enable-sun			enable sun backend [$sun]
--disable-sun			disable sun backend
END
}

#
# defaults
#
prefix=/usr/local			# where to install sndio
so="libsndio.so.\${MAJ}.\${MIN}"	# shared libs to build
alsa=no					# do we want alsa support ?
sun=no					# do we want sun support ?
precision=16				# aucat arithmetic precision
unset vars				# variables passed as arguments
unset bindir				# path where to install binaries
unset datadir				# path where to install doc
unset mandir				# path where to install man pages
unset includedir			# path where to install header file
unset libdir				# path where to install library
unset defs				# no extra #defines
unset ldadd				# no extra libraries (-l options)

#
# guess OS-specific parameters
#
case `uname` in
	Linux)
		alsa=yes
		ldadd="-lrt"
		so="$so libsndio.so.\${MAJ} libsndio.so"
		defs='-DCOMPAT_ISSETUGID \\\
		-DCOMPAT_STRLCAT -DCOMPAT_STRLCPY -DCOMPAT_STRTONUM \\\
		-DCOMPAT_LETOH -DDEV_RANDOM=\\"/dev/urandom\\"'
		;;
	OpenBSD)
		sun=yes
		defs='-DUSE_ARC4RANDOM'
		;;
esac

# shell word separator (none)
IFS=''

# sed-quoted new-line
nl='\
'

for i; do
	case "$i" in
	--prefix=*)
		prefix="${i#--prefix=}"
		shift;;
	--bindir=*)
		bindir="${i#--bindir=}"
		shift;;
	--datadir=*)
		datadir="${i#--datadir=}"
		shift;;
	--includedir=*)
		includedir="${i#--includedir=}"
		shift;;
	--libdir=*)
		libdir="${i#--libdir=}"
		shift;;
	--mandir=*)
		mandir="${i#--mandir=}"
		shift;;
	--enable-alsa)
		alsa=yes
		shift;;
	--disable-alsa)
		alsa=no
		shift;;
	--enable-sun)
		sun=yes
		shift;;
	--disable-sun)
		sun=no
		shift;;
	--precision=*)
		precision="${i#--precision=}"
		if [ "$precision" != 16 -a "$precision" != 24 ]; then
			echo "$i: only 16 and 24 are supported" >&2
			exit 1
		fi
		shift;;
	CC=*|CFLAGS=*|LDFLAGS=*)
		vars="$vars$i$nl"
		shift;;
	*)
		help
		exit 1
		;;
	esac
done

#
# if $xxxdir is not specified, define it to $prefix/xxx
#
bindir="${bindir:-$prefix/bin}"
datadir="${datadir:-$prefix/share}"
includedir="${includedir:-$prefix/include}"
libdir="${libdir:-$prefix/lib}"
mandir="${mandir:-$prefix/share/man}"

#
# if using ALSA, add corresponding parameters
#
if [ $alsa = yes ]; then
	defs="$defs -DUSE_ALSA"
	ldadd="$ldadd -lasound"
fi

#
# if using Sun API, add corresponding parameters
#
if [ $sun = yes ]; then
	defs="$defs -DUSE_SUN"
fi

for makefile in Makefile aucat/Makefile libsndio/Makefile examples/Makefile
do
	sed \
	-e "s:@bindir@:$bindir:" \
	-e "s:@datadir@:$datadir:" \
	-e "s:@includedir@:$includedir:" \
	-e "s:@libdir@:$libdir:" \
	-e "s:@mandir@:$mandir:" \
	-e "s:@defs@:$defs:" \
	-e "s:@ldadd@:$ldadd:" \
	-e "s:@so@:$so:" \
	-e "s:@vars@:${vars}:" \
	-e "s:@precision@:$precision:" \
	< $makefile.in > $makefile
done

echo
echo "bindir................... $bindir"
echo "datadir.................. $datadir"
echo "includedir............... $includedir"
echo "libdir................... $libdir"
echo "mandir................... $mandir"
echo "precision................ $precision"
echo "alsa..................... $alsa"
echo "sun...................... $sun"
echo
echo "Do \"make && make install\" to compile and install sndio"
echo