#!/usr/bin/perl -w

$flavour = shift;
$prev_abidir = shift;
$abidir = shift;
$skipmodule = shift;

print "II: Checking modules for $flavour...";

if (-f "$prev_abidir/ignore.modules"
    or -f "$prev_abidir/$flavour.ignore.modules") {
	print "explicitly ignoring modules\n";
	exit(0);
}

if (not -f "$abidir/$flavour.modules" or not -f
    "$prev_abidir/$flavour.modules") {
	print "previous or current modules file missing!\n";
	print "   $abidir/$flavour.modules\n";
	print "   $prev_abidir/$flavour.modules\n";
	if (defined($skipmodule)) {
		exit(0);
	} else {
		exit(1);
	}
}

print "\n";

my %modules;
my %modules_ignore;
my $missing = 0;
my $new = 0;
my $errors = 0;

# See if we have any ignores
if (-f "$prev_abidir/../modules.ignore") {
	my $ignore = 0;
	open(IGNORE, "< $prev_abidir/../modules.ignore") or
		die "Could not open $prev_abidir/../modules.ignore";
	print "   reading modules to ignore...";
	while (<IGNORE>) {
		chomp;
		next if /\s*#/;
		$modules_ignore{$_} = 1;
		$ignore++;
	}
	close(IGNORE);
	print "read $ignore modules.\n";
}

# Read new modules first
print "   reading new modules...";
$new_count = 0;
open(NEW, "< $abidir/$flavour.modules") or
	die "Could not open $abidir/$flavour.modules";
while (<NEW>) {
	chomp;
	$modules{$_} = 1;
	$new_count++;
}
close(NEW);
print "read $new_count modules.\n";

# Now the old modules, checking for missing ones
print "   reading old modules...";
$old_count = 0;
open(OLD, "< $prev_abidir/$flavour.modules") or
	die "Could not open $prev_abidir/$flavour.modules";
while (<OLD>) {
	chomp;
	if (not defined($modules{$_})) {
		print "\n" if not $missing;
		$missing++;
		if (not defined($modules_ignore{$_})) {
			print "      MISS: $_\n";
			$errors++;
		} else {
			print "      MISS: $_ (ignored)\n";
		}
	} else {
		$modules{$_}++;
	}
	$old_count++;
}
close(OLD);
# Check for new modules
foreach $mod (keys(%modules)) {
	if ($modules{$mod} < 2) {
		print "\n" if not $missing and not $new;
		print "      NEW : $mod\n";
		$new++;
	}
}
if ($new or $missing) {
	print "      read $old_count modules : new($new)  missing($missing)\n";
} else {
	print "read $old_count modules.\n";
}


# Let's see where we stand...
if ($errors) {
	if (defined($skipmodule)) {
		print "WW: Explicitly asked to ignore failures (probably not good)\n";
	} else {
		print "EE: Missing modules (start begging for mercy)\n";
		exit 1
	}
}

if ($new) {
	print "II: New modules (you've been busy, wipe the poop off your nose)\n";
} else {
	print "II: No new modules (hope you're happy, slacker)\n";
}

print "II: Done\n";

exit(0);