#!/bin/bash# Manipulate options in a .config file from the command line # If no prefix forced, use the default CONFIG_CONFIG_="${CONFIG_-CONFIG_}" usage() {	cat >&2 <<EOLManipulate options in a .config file from the command line.Usage:config options command ...commands:	--enable|-e option   Enable option	--disable|-d option  Disable option	--module|-m option   Turn option into a module	--set-str option string	                     Set option to "string"	--set-val option value	                     Set option to value	--undefine|-u option Undefine option	--state|-s option    Print state of option (n,y,m,undef) 	--enable-after|-E beforeopt option                             Enable option directly after other option	--disable-after|-D beforeopt option                             Disable option directly after other option	--module-after|-M beforeopt option                             Turn option into module directly after other option 	commands can be repeated multiple times options:	--file config-file   .config file to change (default .config)	--keep-case|-k       Keep next symbols' case (dont' upper-case it) config doesn't check the validity of the .config file. This is done at nextmake time. By default, config will upper-case the given symbol. Use --keep-case to keepthe case of all following symbols unchanged. config uses 'CONFIG_' as the default symbol prefix. Set the environmentvariable CONFIG_ to the prefix to use. Eg.: CONFIG_="FOO_" config ...EOL	exit 1} checkarg() {	ARG="$1"	if [ "$ARG" = "" ] ; then		usage	fi	case "$ARG" in	${CONFIG_}*)		ARG="${ARG/${CONFIG_}/}"		;;	esac	if [ "$MUNGE_CASE" = "yes" ] ; then		ARG="`echo $ARG | tr a-z A-Z`"	fi} set_var() {	local name=$1 new=$2 before=$3 	name_re="^($name=|# $name is not set)"	before_re="^($before=|# $before is not set)"	if test -n "$before" && grep -Eq "$before_re" "$FN"; then		sed -ri "/$before_re/a $new" "$FN"	elif grep -Eq "$name_re" "$FN"; then		sed -ri "s:$name_re.*:$new:" "$FN"	else		echo "$new" >>"$FN"	fi} undef_var() {	local name=$1 	sed -ri "/^($name=|# $name is not set)/d" "$FN"} if [ "$1" = "--file" ]; then	FN="$2"	if [ "$FN" = "" ] ; then		usage	fi	shift 2else	FN=.configfi if [ "$1" = "" ] ; then	usagefi MUNGE_CASE=yeswhile [ "$1" != "" ] ; do	CMD="$1"	shift	case "$CMD" in	--keep-case|-k)		MUNGE_CASE=no		continue		;;	--refresh)		;;	--*-after|-E|-D|-M)		checkarg "$1"		A=$ARG		checkarg "$2"		B=$ARG		shift 2		;;	-*)		checkarg "$1"		shift		;;	esac	case "$CMD" in	--enable|-e)		set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=y"		;; 	--disable|-d)		set_var "${CONFIG_}$ARG" "# ${CONFIG_}$ARG is not set"		;; 	--module|-m)		set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=m"		;; 	--set-str)		# sed swallows one level of escaping, so we need double-escaping		set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=\"${1//\"/\\\\\"}\""		shift		;; 	--set-val)		set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=$1"		shift		;;	--undefine|-u)		undef_var "${CONFIG_}$ARG"		;; 	--state|-s)		if grep -q "# ${CONFIG_}$ARG is not set" $FN ; then			echo n		else			V="$(grep "^${CONFIG_}$ARG=" $FN)"			if [ $? != 0 ] ; then				echo undef			else				V="${V/#${CONFIG_}$ARG=/}"				V="${V/#\"/}"				V="${V/%\"/}"				V="${V//\\\"/\"}"				echo "${V}"			fi		fi		;; 	--enable-after|-E)		set_var "${CONFIG_}$B" "${CONFIG_}$B=y" "${CONFIG_}$A"		;; 	--disable-after|-D)		set_var "${CONFIG_}$B" "# ${CONFIG_}$B is not set" "${CONFIG_}$A"		;; 	--module-after|-M)		set_var "${CONFIG_}$B" "${CONFIG_}$B=m" "${CONFIG_}$A"		;; 	# undocumented because it ignores --file (fixme)	--refresh)		yes "" | make oldconfig		;; 	*)		usage		;;	esacdone