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