scripts/config.pl

   1 #!/usr/bin/env perl
   2 #
   3 # Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
   4 #
   5 # This is free software, licensed under the GNU General Public License v2.
   6 # See /LICENSE for more information.
   7 #
   8
   9 use warnings;
  10 use strict;
  11
  12 my @arg = @ARGV;
  13
  14 sub load_config($) {
  15         my $file = shift;
  16         my %config;
  17
  18         open FILE, "$file" or die "can't open file";
  19         while (<FILE>) {
  20                 chomp;
  21                 /^CONFIG_(.+?)=(.+)/ and do {
  22                         $config{$1} = $2;
  23                         next;
  24                 };
  25                 /^# CONFIG_(.+?) is not set/ and do {
  26                         $config{$1} = "#undef";
  27                         next;
  28                 };
  29                 /^#/ and next;
  30                 /^(.+)$/ and print "WARNING: can't parse line: $1\n";
  31         }
  32         return \%config;
  33 }
  34
  35
  36 sub config_and($$) {
  37         my $cfg1 = shift;
  38         my $cfg2 = shift;
  39         my %config;
  40
  41         foreach my $config (keys %$cfg1) {
  42                 my $val1 = $cfg1->{$config};
  43                 my $val2 = $cfg2->{$config};
  44                 $val2 and ($val1 eq $val2) and do {
  45                         $config{$config} = $val1;
  46                 };
  47         }
  48         return \%config;
  49 }
  50
  51
  52 sub config_add($$) {
  53         my $cfg1 = shift;
  54         my $cfg2 = shift;
  55         my %config;
  56
  57         for ($cfg1, $cfg2) {
  58                 my %cfg = %$_;
  59
  60                 foreach my $config (keys %cfg) {
  61                         $config{$config} = $cfg{$config};
  62                 }
  63         }
  64         return \%config;
  65 }
  66
  67 sub config_diff($$) {
  68         my $cfg1 = shift;
  69         my $cfg2 = shift;
  70         my %config;
  71
  72         foreach my $config (keys %$cfg2) {
  73                 if (!$cfg1->{$config} or $cfg1->{$config} ne $cfg2->{$config}) {
  74                         $config{$config} = $cfg2->{$config};
  75                 }
  76         }
  77         return \%config
  78 }
  79
  80 sub config_sub($$) {
  81         my $cfg1 = shift;
  82         my $cfg2 = shift;
  83         my %config = %{$cfg1};
  84
  85         foreach my $config (keys %$cfg2) {
  86                 delete $config{$config};
  87         }
  88         return \%config;
  89 }
  90
  91 sub print_cfgline($$) {
  92         my $name = shift;
  93         my $val = shift;
  94         if ($val eq '#undef') {
  95                 print "# CONFIG_$name is not set\n";
  96         } else {
  97                 print "CONFIG_$name=$val\n";
  98         }
  99 }
 100
 101
 102 sub dump_config($) {
 103         my $cfg = shift;
 104         die "argument error in dump_config" unless ($cfg);
 105         my %config = %$cfg;
 106         foreach my $config (sort keys %config) {
 107                 print_cfgline($config, $config{$config});
 108         }
 109 }
 110
 111 sub parse_expr($);
 112
 113 sub parse_expr($) {
 114         my $pos = shift;
 115         my $arg = $arg[$$pos++];
 116
 117         die "Parse error" if (!$arg);
 118
 119         if ($arg eq '&') {
 120                 my $arg1 = parse_expr($pos);
 121                 my $arg2 = parse_expr($pos);
 122                 return config_and($arg1, $arg2);
 123         } elsif ($arg =~ /^\+/) {
 124                 my $arg1 = parse_expr($pos);
 125                 my $arg2 = parse_expr($pos);
 126                 return config_add($arg1, $arg2);
 127         } elsif ($arg eq '>') {
 128                 my $arg1 = parse_expr($pos);
 129                 my $arg2 = parse_expr($pos);
 130                 return config_diff($arg1, $arg2);
 131         } elsif ($arg eq '-') {
 132                 my $arg1 = parse_expr($pos);
 133                 my $arg2 = parse_expr($pos);
 134                 return config_sub($arg1, $arg2);
 135         } else {
 136                 return load_config($arg);
 137         }
 138 }
 139
 140 my $pos = 0;
 141 dump_config(parse_expr(\$pos));
 142 die "Parse error" if ($arg[$pos]);