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#!/bin/bash

# Manipulate options in a .config file from the command line

usage() {

cat >&2 <<EOL

Manipulate 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

--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 to change (default .config)

config doesn't check the validity of the .config file. This is done at next

make time.

EOL

exit 1

}

checkarg() {

ARG="$1"

if [ "$ARG" = "" ] ; then

usage

fi

case "$ARG" in

CONFIG_*)

ARG="${ARG/CONFIG_/}"

;;

esac

ARG="`echo $ARG | tr a-z A-Z`"

}

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

}

if [ "$1" = "--file" ]; then

FN="$2"

if [ "$FN" = "" ] ; then

usage

fi

shift 2

else

FN=.config

fi

if [ "$1" = "" ] ; then

usage

fi

while [ "$1" != "" ] ; do

CMD="$1"

shift

case "$CMD" in

--refresh)

;;

--*-after)

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)

set_var "CONFIG_$ARG" "CONFIG_$ARG=\"$1\""

shift

;;

--set-val)

set_var "CONFIG_$ARG" "CONFIG_$ARG=$1"

shift

;;

--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/\"/}"

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

;;

esac

done