configure

#!/bin/bash
#
# ./configure -- A very simple configure script for v86d.
#
# (c) 2006-2007, Michal Januszewski <spock@gentoo.org>
#
# In time, it will be replaced by a fully-fledged version.
#

copt_klibc=CONFIG_KLIBC
copt_klibc_desc="Link statically against klibc"
copt_klibc_type="bool"
copt_klibc_def=n

copt_debug=CONFIG_DEBUG
copt_debug_desc="Use additional debugging features"
copt_debug_type="bool"
copt_debug_def=n

copt_x86emu=CONFIG_X86EMU
copt_x86emu_desc="Use x86emu for BIOS calls"
copt_x86emu_type="bool"
copt_x86emu_def=auto
copt_x86emu_test()
{
	local m=`uname -m`
	if [ "$m" = "i686" -o "$m" = "i586" -o "$m" = "i486" -o "$m" = "i386" ]; then
		echo "n";
	elif [ "$m" = "x86_64" ]; then
		echo "y";
	else
		echo "It looks like your architecture '$m' isn't supported by this version of v86d." >&2
		exit 1
	fi
}

options=`set | grep '^copt_' | sed -re 's/copt_([^_=]+)[_=].*/\1/' | uniq`

write_conf()
{
	echo -n > config.h

	for i in ${options} ; do
		eval vval=\$copt_$i\_val
		eval vtype=\$copt_$i\_type
		eval vname=\$copt_$i

		if [[ "$vtype" == "bool" ]]; then
			if [[ "$vval" == "y" ]]; then
				echo "#define $vname" >> config.h
			else
				echo "#undef $vname" >> config.h
			fi
		else
			echo "#define $vname \"$vval\"" >> config.h
		fi
	done

	echo "config.h successfully created."
	echo "You can run \`make\` now."
}

usage()
{
	cat <<EOTB
v86d configuration script

Please use the following options to configure v86d.
EOTB
    printf "  %-20s %-s\n\n" --default "Use a default v86d configuration"

	for i in ${options} ; do
		eval vtype=\$copt_$i\_type
		eval vdesc=\$copt_$i\_desc
		eval vdef=\$copt_$i\_def

		if [[ ${vtype} == "string" ]]; then
			with="--with-${i}=VAL"
		else
			with="--with-${i}"
		fi

		vdesc="${vdesc} (default: $vdef)"

		printf "  %-20s %-s\n" ${with} "${vdesc}"
	done
}

if [[ $# == 0 ]]; then
	usage
	exit
fi

for i in ${options} ; do
	eval copt_${i}_val="\$copt_${i}_def"
	if [ -n "$(set | grep copt_${i}_test)" ]; then
		eval copt_${i}_val="\$(copt_${i}_test)"
	fi
done

for i in $* ; do
	if [[ "$i" == "--help" ]]; then
		usage
		exit
	elif [[ "$i" == "--default" ]]; then
		write_conf
		exit
	fi

	j=${i//--with-}
	if [[ "$j" != "$i" ]]; then
		with=y
	else
		j=${i//--without-}
		if [[ "$j" != "$i" ]]; then
			with=n
		else
			usage
			exit
		fi
	fi

	optval=${j#*=}
	optname=${j%=*}

	eval t=\$copt_${optname}_val
	if [[ "x$t" == "x" ]]; then
		echo "Unrecognized setting ${optname}." 1>&2
		exit
	fi

	eval vtype=\$copt_${optname}_type
	if [[ "$vtype" == "bool" ]]; then
		eval copt_${optname}_val=${with}
	else
		eval copt_${optname}_val=${optval}
	fi
done

write_conf
exit