1#!/bin/bash
2# Manipulate options in a .config file from the command line
3
4myname=${0##*/}
5
6# If no prefix forced, use the default BR2_
7BR2_PREFIX="${BR2_PREFIX-BR2_}"
8
9usage() {
10	cat >&2 <<EOL
11Manipulate options in a .config file from the command line.
12Usage:
13$myname options command ...
14commands:
15	--enable|-e option   Enable option
16	--disable|-d option  Disable option
17	--set-str option string
18	                     Set option to "string"
19	--set-val option value
20	                     Set option to value
21	--undefine|-u option Undefine option
22	--state|-s option    Print state of option (n,y,m,undef)
23
24	--enable-after|-E beforeopt option
25                             Enable option directly after other option
26	--disable-after|-D beforeopt option
27                             Disable option directly after other option
28
29	commands can be repeated multiple times
30
31options:
32	--file config-file   .config file to change (default .config)
33	--keep-case|-k       Keep next symbols' case (dont' upper-case it)
34	--package|-p         Operate on package (set prefix to BR2_PACKAGE_)
35
36$myname doesn't check the validity of the .config file. This is done at next
37make time.
38
39By default, $myname will upper-case the given symbol. Use --keep-case to keep
40the case of all following symbols unchanged.
41
42$myname uses 'BR2_' as the default symbol prefix. Set the environment
43variable BR2_PREFIX to the prefix to use. Eg.: BR2_PREFIX="FOO_" $myname ...
44EOL
45	exit 1
46}
47
48checkarg() {
49	ARG="$1"
50	if [ "$ARG" = "" ] ; then
51		usage
52	fi
53	if [ "$MUNGE_CASE" = "yes" ] ; then
54		ARG="$(echo "$ARG" | tr a-z- A-Z_)"
55	fi
56	case "$ARG" in
57	${BR2_PREFIX}*)
58		ARG="${ARG/${BR2_PREFIX}/}"
59		;;
60	esac
61}
62
63txt_append() {
64	local anchor="$1"
65	local insert="$2"
66	local infile="$3"
67
68	# sed append cmd: 'a\' + newline + text + newline
69	cmd="$(printf "a\\%b$insert" "\n")"
70
71	sed -i -e "/$anchor/$cmd" "$infile"
72}
73
74txt_subst() {
75	local before="$1"
76	local after="$2"
77	local infile="$3"
78
79	sed -i -e "s:$before:$after:" "$infile"
80}
81
82txt_delete() {
83	local text="$1"
84	local infile="$2"
85
86	sed -i -e "/$text/d" "$infile"
87}
88
89set_var() {
90	local name=$1 new=$2 before=$3
91
92	name_re="^($name=|# $name is not set)"
93	before_re="^($before=|# $before is not set)"
94	if test -n "$before" && grep -Eq "$before_re" "$FN"; then
95		txt_append "^$before=" "$new" "$FN"
96		txt_append "^# $before is not set" "$new" "$FN"
97	elif grep -Eq "$name_re" "$FN"; then
98		txt_subst "^$name=.*" "$new" "$FN"
99		txt_subst "^# $name is not set" "$new" "$FN"
100	else
101		echo "$new" >>"$FN"
102	fi
103}
104
105undef_var() {
106	local name=$1
107
108	txt_delete "^$name=" "$FN"
109	txt_delete "^# $name is not set" "$FN"
110}
111
112if [ "$1" = "--file" ]; then
113	FN="$2"
114	if [ "$FN" = "" ] ; then
115		usage
116	fi
117	shift 2
118else
119	FN=.config
120fi
121
122if [ "$1" = "" ] ; then
123	usage
124fi
125
126MUNGE_CASE=yes
127while [ "$1" != "" ] ; do
128	CMD="$1"
129	shift
130	case "$CMD" in
131	--keep-case|-k)
132		MUNGE_CASE=no
133		continue
134		;;
135	--package|-p)
136		BR2_PREFIX="BR2_PACKAGE_"
137		continue
138		;;
139	--*-after|-E|-D|-M)
140		checkarg "$1"
141		A=$ARG
142		checkarg "$2"
143		B=$ARG
144		shift 2
145		;;
146	-*)
147		checkarg "$1"
148		shift
149		;;
150	esac
151	case "$CMD" in
152	--enable|-e)
153		set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=y"
154		;;
155
156	--disable|-d)
157		set_var "${BR2_PREFIX}$ARG" "# ${BR2_PREFIX}$ARG is not set"
158		;;
159
160	--set-str)
161		# sed swallows one level of escaping, so we need double-escaping
162		set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=\"${1//\"/\\\\\"}\""
163		shift
164		;;
165
166	--set-val)
167		set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=$1"
168		shift
169		;;
170	--undefine|-u)
171		undef_var "${BR2_PREFIX}$ARG"
172		;;
173
174	--state|-s)
175		if grep -q "# ${BR2_PREFIX}$ARG is not set" $FN ; then
176			echo n
177		else
178			if V="$(grep "^${BR2_PREFIX}$ARG=" $FN)"; then
179				V="${V/#${BR2_PREFIX}$ARG=/}"
180				V="${V/#\"/}"
181				V="${V/%\"/}"
182				V="${V//\\\"/\"}"
183				echo "${V}"
184			else
185				echo undef
186			fi
187		fi
188		;;
189
190	--enable-after|-E)
191		set_var "${BR2_PREFIX}$B" "${BR2_PREFIX}$B=y" "${BR2_PREFIX}$A"
192		;;
193
194	--disable-after|-D)
195		set_var "${BR2_PREFIX}$B" "# ${BR2_PREFIX}$B is not set" "${BR2_PREFIX}$A"
196		;;
197
198	*)
199		usage
200		;;
201	esac
202done
203