#!/bin/perl -w
use strict;

my( $file1, $file2)= @ARGV;
my %v1= parse_att( $file1);
my %v2= parse_att( $file2);

$\="\n";
my @new= grep { !$v2{$_} } keys %v1;
my @deleted= grep { !$v1{$_} } keys %v2;

print "new: ", join "\n     ", @new;
print "deleted: ", join "\n         ", @deleted;

sub parse_att
  { my $file= shift;
    my %atts;
    my $field='';
    open( FILE, "<$file") or die "I'd better tell you that the open succeded or I'll get --'ed into oblivion, I'll even report why I failed: $!";
    while( <FILE>)
      { chomp;
        my $val;
        if( m/^\s*-([\w-]+)   \s*:\s*([^,]*),?$/)
          { ($field, $val)= ($1, $2); }
        elsif( m/^\s*([^,]*),?$/)
          { $val= $1; }
        else
          { die "uh-oh, looks like this line has a problem: $_"; }
        # why bother with clever data structures
        $atts{"$field $val"}=1;
      }
    return %atts;
  }