Bug#821096: (no subject)

to make it prompt you to select "keep current|merge|override"
 when the target wml file exists

first some lines of "make_wml" subroutine
sub make_wml{
  $moreinfo = read_old_wml($wml, $moreinfo) if (-f $wml);
  return if($moreinfo eq "KEEP");
  open WML, ">", "$wml";

new subroutine:
sub read_old_wml{
  my $w = shift;
  my $n = shift;
  return unless (-f $w);
  open (WML, "<", $w) or return;
  my ($flag, $o);
  while (my $c=<WML>){
    last if((substr($c,0,20) eq '<p>For the oldstable')
		||(substr($c,0,17) eq '<p>For the stable')
		||(substr($c,0,18) eq '<p>For the testing')
		||(substr($c,0,19) eq '<p>For the unstable'));
    $o .= $c if($flag);
    $flag=1 if(substr($c,0,21) eq '<define-tag moreinfo>');
  }
  close WML;
  print "$w already exists!\n";
  print "current wml file has no contents. will be overridden.\n" if(!$o);
  print "current wml file has following contents:\n\t" if($o);
  print $o =~ s/\n/\n\t/rg if($o);
  print "\n\tchoices are: keep current[K], merge[M], override[O].\n" if($o);
  print "\t(defaults to 'keep current', do nothing.)\n" if($o);
  my $s;
  my $e=<STDIN>;
  chomp $e;
  $s = 1 if ($e eq "O");
  $s = 2 if ($e eq "M");
  return "KEEP" if(!$s);
  return $n if ($s == 1);
  # merge old description and new package versions below
  my $p = index($n, "\n\n<p>For the");
  my $n2 = substr($n,$p);
  $n = substr($n,0,$p);
  print "\nn:$n\n";
  $p = index($o, "\n\n<p>For the");
  $o = substr($o,0,$p);
  return "$n\n\n<p>For reference, the original advisory text follows.</p>\n\n$o$n2";
}