package WalkTree;
use strict;

my $DIRSEP =
	$^O =~ /Mac/ ? ':' :
		$^O =~ /Win|OS-2|DOS/ ? '\\' : '/';

my $MACOS = ( $^O =~ /Mac/ ) || 0;
my $WINOS = ( $^O =~ /Win|OS-2|DOS/ ) || 0;

sub walktree {
	my ( $dir, $filefunc, $dirfunc, $prune ) = @_;
	my @values;
	$MACOS and $dir =~ s/:$//;
	if ( -d $dir ) {
		if( $prune and $dir =~ /$prune/o ) { return undef }
		ref $dirfunc and $dirfunc->( $dir );
		local *DH;
		opendir DH, $dir or warn "opendir '$dir' failed\n$!";
		my $entry;
		while ( defined( $entry = readdir DH )) {
			!$MACOS and next if( $entry eq '.' or $entry eq '..' );
			$MACOS  and next if( $entry eq "Icon\n" );
			my $fullpath = "$dir$DIRSEP$entry";
			if( -d $fullpath ) {
				walktree( $fullpath, $filefunc, $dirfunc, $prune );
			}
			elsif( -f $fullpath ) {
				ref $filefunc and $filefunc->( $fullpath );
			}
			push @values, $fullpath;
		}
		closedir DH;
	} 
	else {
		warn "$PACKAGE::walktree() - need a directory argument\n";
	}
	return @values;
}

1;