#!/bin/sh
#$Id$
#Copyright (c) 2012-2014 Pierre Pronchery <khorben@defora.org>
#
#Redistribution and use in source and binary forms, with or without
#modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
#THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
#AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
#IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
#DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
#FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
#DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
#SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
#CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
#OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
#OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.



#variables
PREFIX="/usr/local"
BINDIR=
DATADIR=
INCLUDEDIR=
LDSO=
LIBDIR=
LIBEXECDIR=
MANDIR=
SYSCONFDIR=
[ -f "../config.sh" ] && . "../config.sh"
[ -z "$BINDIR" ] && BINDIR="$PREFIX/bin"
[ -z "$DATADIR" ] && DATADIR="$PREFIX/share"
[ -z "$INCLUDEDIR" ] && INCLUDEDIR="$PREFIX/include"
if [ -z "$LDSO" ]; then
	case "$(uname -s)" in
		FreeBSD)
			LDSO="/libexec/ld-elf.so.1"
			;;
		Linux)
			LDSO="/lib/ld-linux-$(uname -p).so.2"
			;;
		*)
			LDSO="/libexec/ld.elf_so"
			;;
	esac
fi
[ -z "$LIBDIR" ] && LIBDIR="$PREFIX/lib"
[ -z "$LIBEXECDIR" ] && LIBEXECDIR="$PREFIX/libexec"
[ -z "$MANDIR" ] && MANDIR="$DATADIR/man"
if [ -z "$SYSCONFDIR" ]; then
	SYSCONFDIR="$PREFIX/etc"
	[ "$PREFIX" = "/usr" ] && SYSCONFDIR="/etc"
fi
#executables
CHMOD="chmod"
DEBUG="_debug"
DEVNULL="/dev/null"
INSTALL="install"
MKDIR="mkdir -m 0755 -p"
RM="rm -f"
SED="sed"


#functions
#debug
_debug()
{
	echo "$@" 1>&2
	"$@"
}


#error
_error()
{
	echo "subst.sh: $@" 1>&2
	return 2
}


#usage
_usage()
{
	echo "Usage: subst.sh [-c|-i|-u][-P prefix] target..." 1>&2
	return 1
}


#main
clean=0
install=0
uninstall=0
while getopts "ciuP:" name; do
	case $name in
		c)
			clean=1
			;;
		i)
			uninstall=0
			install=1
			;;
		u)
			install=0
			uninstall=1
			;;
		P)
			PREFIX="$OPTARG"
			;;
		?)
			_usage
			exit $?
			;;
	esac
done
shift $(($OPTIND - 1))
if [ $# -eq 0 ]; then
	_usage
	exit $?
fi

#check the variables
if [ -z "$PACKAGE" ]; then
	_error "The PACKAGE variable needs to be set"
	exit $?
fi
if [ -z "$VERSION" ]; then
	_error "The VERSION variable needs to be set"
	exit $?
fi

while [ $# -gt 0 ]; do
	target="$1"
	shift

	#clean
	[ "$clean" -ne 0 ] && continue

	#uninstall
	if [ "$uninstall" -eq 1 ]; then
		$DEBUG $RM -- "$PREFIX/$target"			|| exit 2
		continue
	fi

	#install
	if [ "$install" -eq 1 ]; then
		source="${target#$OBJDIR}"
		$DEBUG $MKDIR -- "$PREFIX"			|| exit 2
		mode="-m 0644"
		[ -x "${source}.in" ] && mode="-m 0755"
		$DEBUG $INSTALL $mode "$target" "$PREFIX/$source" \
								|| exit 2
		continue
	fi

	#create
	source="${target#$OBJDIR}"
	source="${source}.in"
	$DEBUG $SED -e "s,@PACKAGE@,$PACKAGE,g" \
		-e "s,@VERSION@,$VERSION,g" \
		-e "s,@PREFIX@,$PREFIX,g" \
		-e "s,@BINDIR@,$BINDIR,g" \
		-e "s,@DATADIR@,$DATADIR,g" \
		-e "s,@INCLUDEDIR@,$INCLUDEDIR,g" \
		-e "s,@LDSO@,$LDSO,g" \
		-e "s,@LIBDIR@,$LIBDIR,g" \
		-e "s,@LIBEXECDIR@,$LIBEXECDIR,g" \
		-e "s,@MANDIR@,$MANDIR,g" \
		-e "s,@SYSCONFDIR@,$SYSCONFDIR,g" \
		-e "s,@PWD@,$PWD,g" \
		-- "$source" > "$target"
	if [ $? -ne 0 ]; then
		$RM -- "$target" 2> "$DEVNULL"
		exit 2
	elif [ -x "$source" ]; then
		$DEBUG $CHMOD 0755 "$target"
	fi
done