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}

sub generate_diff {
	my ($tree_a, $tree_b) = @_;
	my @diff_tree = qw(diff-tree -z -r);
	if ($_cp_similarity) {
		push @diff_tree, "-C$_cp_similarity";
	} else {
		push @diff_tree, '-C';
	}
	push @diff_tree, '--find-copies-harder' if $_find_copies_harder;
	push @diff_tree, "-l$_rename_limit" if defined $_rename_limit;
	push @diff_tree, $tree_a, $tree_b;
	my ($diff_fh, $ctx) = command_output_pipe(@diff_tree);
	my $state = 'meta';
	my @mods;
	while (defined($_ = get_record($diff_fh, "\0"))) {
		if ($state eq 'meta' && /^:(\d{6})\s(\d{6})\s
					($::sha1)\s($::sha1)\s
					([MTCRAD])\d*$/xo) {
			push @mods, {	mode_a => $1, mode_b => $2,
					sha1_a => $3, sha1_b => $4,
					chg => $5 };
			if ($5 =~ /^(?:C|R)$/) {
				$state = 'file_a';
			} else {
				$state = 'file_b';
			}
		} elsif ($state eq 'file_a') {
			my $x = $mods[$#mods] or croak "Empty array\n";
			if ($x->{chg} !~ /^(?:C|R)$/) {
				croak "Error parsing $_, $x->{chg}\n";
			}
			$x->{file_a} = $_;
			$state = 'file_b';
		} elsif ($state eq 'file_b') {
			my $x = $mods[$#mods] or croak "Empty array\n";
			if (exists $x->{file_a} && $x->{chg} !~ /^(?:C|R)$/) {
				croak "Error parsing $_, $x->{chg}\n";
			}
			if (!exists $x->{file_a} && $x->{chg} =~ /^(?:C|R)$/) {
				croak "Error parsing $_, $x->{chg}\n";
			}
			$x->{file_b} = $_;
			$state = 'meta';
		} else {
			croak "Error parsing $_\n";
		}
	}
	command_close_pipe($diff_fh, $ctx);
	\@mods;
}

sub check_diff_paths {
	my ($ra, $pfx, $rev, $mods) = @_;
	my %types;
	$pfx .= '/' if length $pfx;

	sub type_diff_paths {
		my ($ra, $types, $path, $rev) = @_;
		my @p = split m#/+#, $path;
		my $c = shift @p;
		unless (defined $types->{$c}) {
			$types->{$c} = $ra->check_path($c, $rev);
		}
		while (@p) {
			$c .= '/' . shift @p;
			next if defined $types->{$c};
			$types->{$c} = $ra->check_path($c, $rev);
		}
	}

	foreach my $m (@$mods) {
		foreach my $f (qw/file_a file_b/) {
			next unless defined $m->{$f};
			my ($dir) = ($m->{$f} =~ m#^(.*?)/?(?:[^/]+)$#);
			if (length $pfx.$dir && ! defined $types{$dir}) {
				type_diff_paths($ra, \%types, $pfx.$dir, $rev);
			}
		}
	}
	\%types;
}

sub split_path {
	return ($_[0] =~ m#^(.*?)/?([^/]+)$#);
}

sub repo_path {
	my ($self, $path) = @_;
	if (my $enc = $self->{pathnameencoding}) {
		require Encode;
		Encode::from_to($path, $enc, 'UTF-8');
	}
	$self->{path_prefix}.(defined $path ? $path : '');
}

sub url_path {
	my ($self, $path) = @_;
	$path = $self->repo_path($path);
	if ($self->{url} =~ m#^https?://#) {
		# characters are taken from subversion/libsvn_subr/path.c
		$path =~ s#([^~a-zA-Z0-9_./!$&'()*+,-])#sprintf("%%%02X",ord($1))#eg;
	}
	$self->{url} . '/' . $path;
}

sub rmdirs {
	my ($self) = @_;
	my $rm = $self->{rm};
	delete $rm->{''}; # we never delete the url we're tracking
	return unless %$rm;

	foreach (keys %$rm) {
		my @d = split m#/#, $_;
		my $c = shift @d;
		$rm->{$c} = 1;
		while (@d) {
			$c .= '/' . shift @d;
			$rm->{$c} = 1;
		}
	}
	delete $rm->{$self->{svn_path}};
	delete $rm->{''}; # we never delete the url we're tracking
	return unless %$rm;

	my ($fh, $ctx) = command_output_pipe(qw/ls-tree --name-only -r -z/,
	                                     $self->{tree_b});
	while (defined($_ = get_record($fh, "\0"))) {
		my @dn = split m#/#, $_;
		while (pop @dn) {
			delete $rm->{join '/', @dn};
		}
		unless (%$rm) {
			close $fh;
			return;
		}
	}
	command_close_pipe($fh, $ctx);

	my ($r, $p, $bat) = ($self->{r}, $self->{pool}, $self->{bat});
	foreach my $d (sort { $b =~ tr#/#/# <=> $a =~ tr#/#/# } keys %$rm) {
		$self->close_directory($bat->{$d}, $p);
		my ($dn) = ($d =~ m#^(.*?)/?(?:[^/]+)$#);
		print "\tD+\t$d/\n" unless $::_q;
		$self->SUPER::delete_entry($d, $r, $bat->{$dn}, $p);
		delete $bat->{$d};
	}
}

sub open_or_add_dir {
	my ($self, $full_path, $baton, $deletions) = @_;
	my $t = $self->{types}->{$full_path};
	if (!defined $t) {
		die "$full_path not known in r$self->{r} or we have a bug!\n";
	}
	{
		no warnings 'once';
		# SVN::Node::none and SVN::Node::file are used only once,
		# so we're shutting up Perl's warnings about them.
		if ($t == $SVN::Node::none || defined($deletions->{$full_path})) {
			return $self->add_directory($full_path, $baton,
			    undef, -1, $self->{pool});
		} elsif ($t == $SVN::Node::dir) {
			return $self->open_directory($full_path, $baton,
			    $self->{r}, $self->{pool});
		} # no warnings 'once'
		print STDERR "$full_path already exists in repository at ",
		    "r$self->{r} and it is not a directory (",
		    ($t == $SVN::Node::file ? 'file' : 'unknown'),"/$t)\n";
	} # no warnings 'once'
	exit 1;
}

sub ensure_path {
	my ($self, $path, $deletions) = @_;
	my $bat = $self->{bat};
	my $repo_path = $self->repo_path($path);
	return $bat->{''} unless (length $repo_path);

	my @p = split m#/+#, $repo_path;
	my $c = shift @p;
	$bat->{$c} ||= $self->open_or_add_dir($c, $bat->{''}, $deletions);
	while (@p) {
		my $c0 = $c;
		$c .= '/' . shift @p;
		$bat->{$c} ||= $self->open_or_add_dir($c, $bat->{$c0}, $deletions);
	}
	return $bat->{$c};
}

# Subroutine to convert a globbing pattern to a regular expression.
# From perl cookbook.
sub glob2pat {
	my $globstr = shift;
	my %patmap = ('*' => '.*', '?' => '.', '[' => '[', ']' => ']');
	$globstr =~ s{(.)} { $patmap{$1} || "\Q$1" }ge;
	return '^' . $globstr . '$';
}

sub check_autoprop {
	my ($self, $pattern, $properties, $file, $fbat) = @_;
	# Convert the globbing pattern to a regular expression.
	my $regex = glob2pat($pattern);
	# Check if the pattern matches the file name.
	if($file =~ m/($regex)/) {
		# Parse the list of properties to set.
		my @props = split(/;/, $properties);
		foreach my $prop (@props) {
			# Parse 'name=value' syntax and set the property.
			if ($prop =~ /([^=]+)=(.*)/) {
				my ($n,$v) = ($1,$2);
				for ($n, $v) {
					s/^\s+//; s/\s+$//;
				}
				$self->change_file_prop($fbat, $n, $v);
			}
		}
	}
}

sub apply_autoprops {
	my ($self, $file, $fbat) = @_;
	my $conf_t = ${$self->{config}}{'config'};
	no warnings 'once';
	# Check [miscellany]/enable-auto-props in svn configuration.
	if (SVN::_Core::svn_config_get_bool(
		$conf_t,
		$SVN::_Core::SVN_CONFIG_SECTION_MISCELLANY,
		$SVN::_Core::SVN_CONFIG_OPTION_ENABLE_AUTO_PROPS,
		0)) {
		# Auto-props are enabled.  Enumerate them to look for matches.
		my $callback = sub {
			$self->check_autoprop($_[0], $_[1], $file, $fbat);
		};
		SVN::_Core::svn_config_enumerate(
			$conf_t,
			$SVN::_Core::SVN_CONFIG_SECTION_AUTO_PROPS,
			$callback);
	}
}