#! /bin/sh
# Copyright (C) 2006 Randy Dunlap
# License: GPLv2 only.
#
# usage:  setkconfig symbol y/m/n, or p/empty to print current value;
### symbol should be entered without the leading "CONFIG_" string;
# run 'make oldconfig' after this;

dir=$1
symbol=$2
value=$3

if [ "$symbol" == "" ]; then
	echo "usage: setkconfig config_dir symbol value(y/m/n) or (default:) p to print current value"
	exit 1
fi

# no CONFIG_ used in print/search;
# it's also a "loose/fuzzy" search, finding more than just CONFIG_$symbol;
if [ "$value" == "p" ] || [ "$value" == "" ]; then
	grep "$symbol" $dir/.config
	exit 0
fi

if [ "$value" != "y" ] && [ "$value" != "m" ] && [ "$value" != "n" ]; then
	echo "config symbol value must be one of y/m/n"
	exit 1
fi

if [ "${symbol:0:7}" == "CONFIG_" ]; then
	echo "usage: don't use CONFIG_ prefix; that's done for you"
	exit 1
fi

cp -a $dir/.config $dir/.config.pre

if grep -sq "CONFIG_$symbol=[ymn]" $dir/.config ; then
	sed -e "s/CONFIG_$symbol=[ymn]/CONFIG_$symbol=$value/" $dir/.config.pre > $dir/.config
else
	# "$symbol=[ymn]" not found:
	sed -e "s/^# CONFIG_$symbol is not set/CONFIG_$symbol=$value/" $dir/.config.pre > $dir/.config
	##sed -e "s/^\# CONFIG_$symbol.*$//" .config.pre >.config
	# but $symbol may not be found in .config at all (may be (NEW),
	# so be safe and also append it at end of file:
	echo "CONFIG_$symbol=$value" >> $dir/.config
fi