#!/usr/bin/perl
#
# mlztx - Multilayerize Text (in a KiCad board file)
#
# Written 2011 by Werner Almesberger
# Copyright 2011 Werner Almesberger
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#


sub usage
{
	print STDERR "usage: $0 [-i] board_file src_layer layer ...\n\n";
	print STDERR "  -i  modify board file in place (default: write to ".
	    "stdout)\n";
	exit(1);
}


if ($ARGV[0] eq "-i") {
	$in_place = 1;
	$out = "_tmp";
	shift @ARGV;
} else {
	$out = "-";
}

&usage if $ARGV[0] =~ /^-/;
&usage unless @ARGV > 2;

$f = shift @ARGV;
$src = shift @ARGV;
@dst = @ARGV;

open(FILE, $f) || die "$f: $!";
while (<FILE>) {
	last if /^\$EndBOARD/;
	$s .= $_;
	if (/^\$TEXTPCB/) {
		$text = 1;
		undef $te;
		undef $po;
		undef $de;
		next;
	}
	next unless $text;
	if (/^Te\s/) {
		$te = $_;
		next;
	}
	if (/^Po\s/) {
		$po = $_;
		next;
	}
	if (/^De\s/) {
		$de = $_;
		next;
	}
	die unless /^\$EndTEXTPCB/;
	$text = 0;
	die unless defined $te;
	die unless defined $po;
	die unless defined $de;
	@po = split(/\s+/, $po);
	$x = $po[1];
	$y = $po[2];
	@de = split(/\s+/, $de);
	if ($de[1] == $src) {
		die if defined $te{"$x $y"};
		$te{"$x $y"} = $te;
		$po{"$x $y"} = $po;
		$de{"$x $y"} = $de;
	} else {
		$have{"$x $y"} |= 1 << $de[1];
	}
}
close FILE;

open(FILE, ">$out") || die "$out: $!";
print FILE $s || die "$out: $!";
for $key (keys %te) {
	@de = split(/\s+/, $de{$key});
	for (@dst) {
		next if $have{"$key"} & (1 << $_);;
		@de[1] = $_;
		$de = join(" ", @de);
		print FILE "\$TEXTPCB\n$te{$key}$po{$key}$de\n\$EndTEXTPCB\n" ||
		    die "$out: $!";
	}
}
print FILE "\$EndBOARD\n" || die "$out: $!";
close FILE || die "$out: $!";

rename("$out", $f) || die "rename $out $f: $!" if $in_place;