#!/bin/sh

#
# display help screeen
#
help() {
cat << END
Usage: configure [options]
--prefix=DIR			set install prefix to DIR [$prefix]
--bindir=DIR			install executables in DIR [\$prefix/bin]
--datadir=DIR			install read-only data in DIR [\$prefix/share]
--includedir=DIR		install header files in DIR [\$prefix/include]
--libdir=DIR			install libraries in DIR [\$prefix/lib]
--mandir=DIR			install man pages in DIR [\$prefix/man]
--precision=NUMBER		aucat/sndiod processing precision [$precision]
--privsep-user=USER		non-privileged user for sndio daemon [$user]
--enable-alsa			enable alsa audio & midi backends [$alsa]
--disable-alsa			disable alsa audio & midi backends
--enable-sun			enable sun audio backend [$sun]
--disable-sun			disable sun audio backend
--enable-rmidi			enable character device midi backend [$rmidi]
--disable-rmidi			disable character device midi 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 ?
rmidi=no				# do we want support for raw char dev ?
precision=16				# aucat/sndiod arithmetic precision
user=_sndio				# non-privileged user for sndio daemon
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"
		user=sndiod
		so="$so libsndio.so.\${MAJ} libsndio.so"
		defs='-D_GNU_SOURCE -DDEV_RANDOM=\\"/dev/urandom\\"'
		;;
	OpenBSD)
		sun=yes
		rmidi=yes
		user=_sndio
		defs='-DHAVE_ARC4RANDOM -DHAVE_ISSETUGID \\\
		-DHAVE_STRLCAT -DHAVE_STRLCPY -DHAVE_STRTONUM \\\
		-DHAVE_LETOH '
		;;
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="${i#--mandir=}"
		shift;;
	--enable-alsa)
		alsa=yes
		shift;;
	--disable-alsa)
		alsa=no
		shift;;
	--enable-sun)
		sun=yes
		shift;;
	--disable-sun)
		sun=no
		shift;;
	--enable-rmidi)
		rmidi=yes
		shift;;
	--disable-rmidi)
		rmidi=no
		shift;;
	--privsep-user=*)
		user="${i#--privsep-user=}"
		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

#
# if using raw character devices for midi, add corresponding parameters
#
if [ $rmidi = yes ]; then
	defs="$defs -DUSE_RMIDI"
fi

for f in Makefile aucat/Makefile sndiod/Makefile \
libsndio/Makefile sndioctl/Makefile examples/Makefile \
contrib/init.d.sndiod
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:" \
	-e "s:@user@:$user:" \
	< $f.in > $f
done

cat <<EOF

bindir................... $bindir
datadir.................. $datadir
includedir............... $includedir
libdir................... $libdir
mandir................... $mandir
user..................... $user
precision................ $precision
alsa..................... $alsa
sun...................... $sun
rmidi.................... $rmidi

Do "make && make install" to compile and install sndio

Installation requires the "$libdir" directory to be part of
the system library search path. The "$user" user must exist and
its primary group must have access to audio and MIDI hardware.

EOF