#!/bin/bash
# Manipulate options in a .config file from the command line

myname=${0##*/}

# If no prefix forced, use the default CONFIG_
CONFIG_="${CONFIG_-CONFIG_}"

usage() {
	cat >&2 <<EOL
Manipulate options in a .config file from the command line.
Usage:
$myname 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)

$myname doesn't check the validity of the .config file. This is done at next
make time.

By default, $myname will upper-case the given symbol. Use --keep-case to keep
the case of all following symbols unchanged.

$myname uses 'CONFIG_' as the default symbol prefix. Set the environment
variable CONFIG_ to the prefix to use. Eg.: CONFIG_="FOO_" $myname ...
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
}

txt_append() {
	local anchor="$1"
	local insert="$2"
	local infile="$3"
	local tmpfile="$infile.swp"

	# sed append cmd: 'a\' + newline + text + newline
	cmd="$(printf "a\\%b$insert" "\n")"

	sed -e "/$anchor/$cmd" "$infile" >"$tmpfile"
	# replace original file with the edited one
	mv "$tmpfile" "$infile"
}

txt_subst() {
	local before="$1"
	local after="$2"
	local infile="$3"
	local tmpfile="$infile.swp"

	sed -e "s:$before:$after:" "$infile" >"$tmpfile"
	# replace original file with the edited one
	mv "$tmpfile" "$infile"
}

txt_delete() {
	local text="$1"
	local infile="$2"
	local tmpfile="$infile.swp"

	sed -e "/$text/d" "$infile" >"$tmpfile"
	# replace original file with the edited one
	mv "$tmpfile" "$infile"
}

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
		txt_append "^$before=" "$new" "$FN"
		txt_append "^# $before is not set" "$new" "$FN"
	elif grep -Eq "$name_re" "$FN"; then
		txt_subst "^$name=.*" "$new" "$FN"
		txt_subst "^# $name is not set" "$new" "$FN"
	else
		echo "$new" >>"$FN"
	fi
}

undef_var() {
	local name=$1

	txt_delete "^$name=" "$FN"
	txt_delete "^# $name is not set" "$FN"
}

if [ "$1" = "--file" ]; then
	FN="$2"
	if [ "$FN" = "" ] ; then
		usage
	fi
	shift 2
else
	FN=.config
fi

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

MUNGE_CASE=yes
while [ "$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
		;;
	esac
done
 class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Aleksander Morgado &lt;aleksander@aleksander.es&gt;</td><td class='right'>2017-01-18 21:31:31 +0100</td></tr>
<tr><th>committer</th><td>Johan Hovold &lt;johan@kernel.org&gt;</td><td class='right'>2017-01-19 09:08:37 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/udp_tunnel.h?h=nds-private-remove&amp;id=24d615a694d649aa2e167c3f97f62bdad07e3f84'>24d615a694d649aa2e167c3f97f62bdad07e3f84</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/net/udp_tunnel.h?id=24d615a694d649aa2e167c3f97f62bdad07e3f84'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=24d615a694d649aa2e167c3f97f62bdad07e3f84'>2fe33c115bdec6bf4b01e27afd90bb16fa668e22</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/net/udp_tunnel.h?h=nds-private-remove&amp;id=24d615a694d649aa2e167c3f97f62bdad07e3f84'>include/net/udp_tunnel.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/udp_tunnel.h?h=nds-private-remove&amp;id=49def1853334396f948dcb4cedb9347abb318df5'>49def1853334396f948dcb4cedb9347abb318df5</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/udp_tunnel.h?h=nds-private-remove&amp;id=24d615a694d649aa2e167c3f97f62bdad07e3f84&amp;id2=49def1853334396f948dcb4cedb9347abb318df5'>diff</a>)</td></tr></table>
<div class='commit-subject'>USB: serial: qcserial: add Dell DW5570 QDL</div><div class='commit-msg'>The Dell DW5570 is a re-branded Sierra Wireless MC8805 which will by
default boot with vid 0x413c and pid 0x81a3. When triggered QDL download
mode, the device switches to pid 0x81a6 and provides the standard TTY
used for firmware upgrade.

Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: Aleksander Morgado &lt;aleksander@aleksander.es&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=24d615a694d649aa2e167c3f97f62bdad07e3f84'>Diffstat</a> (limited to 'include/net/udp_tunnel.h')</div><table summary='diffstat' class='diffstat'>