#!/usr/bin/perl
#
# rptflt.pl - Filter known issues from KiCad DRC reports
#
# Written 2014 by Werner Almesberger
# Copyright 2014 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.
#

#
# Usage:
#
# - generate a DRC report file with pcbnew, e.g., foo.rpt
# - review report file for any real issues
# - rename foo.rpt to foo.exceptions
# - to check for new errors, generate new report file, then run
#   rptflt.pl foo.exceptions foo.rpt
#


sub compact
{
	local ($m);

	die if $#e != 2;
	die unless $e[0] =~ /^ErrType\(\d+\):\s+(.*)\s*$/;
	$m = $1;
	die unless $e[1] =~ /^\s+@[^:]++:\s+(.*)\s*$/;
	$m .= "; $1";
	die unless $e[2] =~ /^\s+@[^:]+:\s+(.*)\s*$/;
	$m .= "; $1";
	return $m;
}


sub add
{
	local ($m);

	$m = &compact;
	$exc{$m} = 1;
	undef @e;
}


sub filter
{
	local ($m);

	$m = &compact;
	if (defined $exc{$m}) {
		$seen{$m} = 1;
	} else {
		print join("", @e);
	}
	undef @e;
}


sub process
{
	open(FILE, $_[0]) || die "$_[0]: $!";
	undef @e;
	while (<FILE>) {
		if (/^ErrType/) {
			&flush if @e;
			@e = ($_);
			next;
		}
		if (/^\s+@/) {
			die unless @e;
			push(@e, $_);
			next;
		}
		&flush if @e;
		print unless $silent;
	}
	&flush if @e;
	close FILE;
}


if ($#ARGV != 1) {
	print stderr "usage: $0 name.exceptions name.rpt\n";
	exit(1);
}


*flush = *add;
$silent = 1;
&process($ARGV[0]);
*flush = *filter;
$silent = 0;
&process($ARGV[1]);

for $m (keys %exc) {
#print STDERR "check $i\n";
	next if $seen{$m};
	print STDERR "Warning: exception \"$m\" not seen\n";
}