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#!/usr/bin/env perl
#
# Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
use warnings;
use strict;
my @arg;
my $PREFIX = "CONFIG_";
sub set_config($$$$) {
my $config = shift;
my $idx = shift;
my $newval = shift;
my $mod_plus = shift;
if (!defined($config->{$idx}) or !$mod_plus or
$config->{$idx} eq '#undef' or $newval eq 'y') {
$config->{$idx} = $newval;
}
}
sub load_config($$) {
my $file = shift;
my $mod_plus = shift;
my %config;
open FILE, "$file" or die "can't open file";
while (<FILE>) {
chomp;
/^$PREFIX(.+?)=(.+)/ and do {
set_config(\%config, $1, $2, $mod_plus);
next;
};
/^# $PREFIX(.+?) is not set/ and do {
set_config(\%config, $1, "#undef", $mod_plus);
next;
};
/^#/ and next;
/^(.+)$/ and warn "WARNING: can't parse line: $1\n";
}
return \%config;
}
sub config_and($$) {
my $cfg1 = shift;
my $cfg2 = shift;
my %config;
foreach my $config (keys %$cfg1) {
my $val1 = $cfg1->{$config};
my $val2 = $cfg2->{$config};
$val2 and ($val1 eq $val2) and do {
$config{$config} = $val1;
};
}
return \%config;
}
sub config_add($$$) {
my $cfg1 = shift;
my $cfg2 = shift;
my $mod_plus = shift;
my %config;
for ($cfg1, $cfg2) {
my %cfg = %$_;
foreach my $config (keys %cfg) {
if ($mod_plus and $config{$config}) {
next if $config{$config} eq "y";
next if $cfg{$config} eq '#undef';
}
$config{$config} = $cfg{$config};
}
}
return \%config;
}
sub config_diff($$$) {
my $cfg1 = shift;
my $cfg2 = shift;
my $new_only = shift;
my %config;
foreach my $config (keys %$cfg2) {
if (!defined($cfg1->{$config}) or $cfg1->{$config} ne $cfg2->{$config}) {
next if $new_only and !defined($cfg1->{$config}) and $cfg2->{$config} eq '#undef';
$config{$config} = $cfg2->{$config};
}
}
return \%config
}
sub config_sub($$) {
my $cfg1 = shift;
my $cfg2 = shift;
my %config = %{$cfg1};
foreach my $config (keys %$cfg2) {
delete $config{$config};
}
return \%config;
}
sub print_cfgline($$) {
my $name = shift;
my $val = shift;
if ($val eq '#undef' or $val eq 'n') {
print "# $PREFIX$name is not set\n";
} else {
print "$PREFIX$name=$val\n";
}
}
sub dump_config($) {
my $cfg = shift;
die "argument error in dump_config" unless ($cfg);
my %config = %$cfg;
foreach my $config (sort keys %config) {
print_cfgline($config, $config{$config});
}
}
sub parse_expr {
my $pos = shift;
my $mod_plus = shift;
my $arg = $arg[$$pos++];
die "Parse error" if (!$arg);
if ($arg eq '&') {
my $arg1 = parse_expr($pos);
my $arg2 = parse_expr($pos);
return config_and($arg1, $arg2);
} elsif ($arg =~ /^\+/) {
my $arg1 = parse_expr($pos);
my $arg2 = parse_expr($pos);
return config_add($arg1, $arg2, 0);
} elsif ($arg =~ /^m\+/) {
my $arg1 = parse_expr($pos);
my $arg2 = parse_expr($pos, 1);
return config_add($arg1, $arg2, 1);
} elsif ($arg eq '>') {
my $arg1 = parse_expr($pos);
my $arg2 = parse_expr($pos);
return config_diff($arg1, $arg2, 0);
} elsif ($arg eq '>+') {
my $arg1 = parse_expr($pos);
my $arg2 = parse_expr($pos);
return config_diff($arg1, $arg2, 1);
} elsif ($arg eq '-') {
my $arg1 = parse_expr($pos);
my $arg2 = parse_expr($pos);
return config_sub($arg1, $arg2);
} else {
return load_config($arg, $mod_plus);
}
}
while (@ARGV > 0 and $ARGV[0] =~ /^-\w+$/) {
my $cmd = shift @ARGV;
if ($cmd =~ /^-n$/) {
$PREFIX = "";
} elsif ($cmd =~ /^-p$/) {
$PREFIX = shift @ARGV;
} else {
die "Invalid option: $cmd\n";
}
}
@arg = @ARGV;
my $pos = 0;
dump_config(parse_expr(\$pos));
die "Parse error" if ($arg[$pos]);