#!/usr/bin/perl
#
# sanitize-schem - Remove items from KiCad schematics that may cause an upset
#
# Written 2010 by Werner Almesberger
# Copyright 2010 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 file.sch [outfile]\n";
    exit(1);
}


($file, $out) = @ARGV;
&usage if $#ARGV > 1;

($dir = $file) =~ s|[^/]*$||;
$dir = "." if $dir eq "";

open(FILE, $file) || die "$file: $!";
while (<FILE>) {
    if (/^\$Sheet/) {
	$s = $_;
	$discard = 1;
	next;
    }
    if (/^\$EndSheet/) {
	push(@f, $s.$_) unless $discard;
	undef $s;
	next;
    }
    if (!defined $s) {
	push(@f, $_);
	next;
    }
    $s .= $_;
    next unless /^F1 "([^"]*)"/;
    if (-r "$1" || -r "$dir/$1") {
	$discard = 0;
	next;
    }
    print STDERR "removing $1\n";
}
close FILE;

if (!defined $out) {
    rename($file, "$file.bak");
    $out= $file;
}

open(FILE, ">$out") || die "$out: $!";
print FILE join("", @f) || die "$out: $!";
close FILE || die "$out: $!";