#!/usr/bin/perl

# gitweb - simple web interface to track changes in git repositories
#
# (C) 2005-2006, Kay Sievers <kay.sievers@vrfy.org>
# (C) 2005, Christian Gierke
#
# This program is licensed under the GPLv2

use strict;
use warnings;
use CGI qw(:standard :escapeHTML -nosticky);
use CGI::Util qw(unescape);
use CGI::Carp qw(fatalsToBrowser);
use Encode;
use Fcntl ':mode';
use File::Find qw();
use File::Basename qw(basename);
binmode STDOUT, ':utf8';

BEGIN {
	CGI->compile() if $ENV{'MOD_PERL'};
}

our $cgi = new CGI;
our $version = "++GIT_VERSION++";
our $my_url = $cgi->url();
our $my_uri = $cgi->url(-absolute => 1);

# core git executable to use
# this can just be "git" if your webserver has a sensible PATH
our $GIT = "++GIT_BINDIR++/git";

# absolute fs-path which will be prepended to the project path
#our $projectroot = "/pub/scm";
our $projectroot = "++GITWEB_PROJECTROOT++";

# target of the home link on top of all pages
our $home_link = $my_uri || "/";

# string of the home link on top of all pages
our $home_link_str = "++GITWEB_HOME_LINK_STR++";

# name of your site or organization to appear in page titles
# replace this with something more descriptive for clearer bookmarks
our $site_name = "++GITWEB_SITENAME++"
                 || ($ENV{'SERVER_NAME'} || "Untitled") . " Git";

# filename of html text to include at top of each page
our $site_header = "++GITWEB_SITE_HEADER++";
# html text to include at home page
our $home_text = "++GITWEB_HOMETEXT++";
# filename of html text to include at bottom of each page
our $site_footer = "++GITWEB_SITE_FOOTER++";

# URI of stylesheets
our @stylesheets = ("++GITWEB_CSS++");
# URI of a single stylesheet, which can be overridden in GITWEB_CONFIG.
our $stylesheet = undef;
# URI of GIT logo (72x27 size)
our $logo = "++GITWEB_LOGO++";
# URI of GIT favicon, assumed to be image/png type
our $favicon = "++GITWEB_FAVICON++";

# URI and label (title) of GIT logo link
#our $logo_url = "http://www.kernel.org/pub/software/scm/git/docs/";
#our $logo_label = "git documentation";
our $logo_url = "http://git.or.cz/";
our $logo_label = "git homepage";

# source of projects list
our $projects_list = "++GITWEB_LIST++";

# the width (in characters) of the projects list "Description" column
our $projects_list_description_width = 25;

# default order of projects list
# valid values are none, project, descr, owner, and age
our $default_projects_order = "project";

# show repository only if this file exists
# (only effective if this variable evaluates to true)
our $export_ok = "++GITWEB_EXPORT_OK++";

# only allow viewing of repositories also shown on the overview page
our $strict_export = "++GITWEB_STRICT_EXPORT++";

# list of git base URLs used for URL to where fetch project from,
# i.e. full URL is "$git_base_url/$project"
our @git_base_url_list = grep { $_ ne '' } ("++GITWEB_BASE_URL++");

# default blob_plain mimetype and default charset for text/plain blob
our $default_blob_plain_mimetype = 'text/plain';
our $default_text_plain_charset  = undef;

# file to use for guessing MIME types before trying /etc/mime.types
# (relative to the current git repository)
our $mimetypes_file = undef;

# assume this charset if line contains non-UTF-8 characters;
# it should be valid encoding (see Encoding::Supported(3pm) for list),
# for which encoding all byte sequences are valid, for example
# 'iso-8859-1' aka 'latin1' (it is decoded without checking, so it
# could be even 'utf-8' for the old behavior)
our $fallback_encoding = 'latin1';

# rename detection options for git-diff and git-diff-tree
# - default is '-M', with the cost proportional to
#   (number of removed files) * (number of new files).
# - more costly is '-C' (which implies '-M'), with the cost proportional to
#   (number of changed files + number of removed files) * (number of new files)
# - even more costly is '-C', '--find-copies-harder' with cost
#   (number of files in the original tree) * (number of new files)
# - one might want to include '-B' option, e.g. '-B', '-M'
our @diff_opts = ('-M'); # taken from git_commit

# information about snapshot formats that gitweb is capable of serving
our %known_snapshot_formats = (
	# name => {
	# 	'display' => display name,
	# 	'type' => mime type,
	# 	'suffix' => filename suffix,
	# 	'format' => --format for git-archive,
	# 	'compressor' => [compressor command and arguments]
	# 	                (array reference, optional)}
	#
	'tgz' => {
		'display' => 'tar.gz',
		'type' => 'application/x-gzip',
		'suffix' => '.tar.gz',
		'format' => 'tar',
		'compressor' => ['gzip']},

	'tbz2' => {
		'display' => 'tar.bz2',
		'type' => 'application/x-bzip2',
		'suffix' => '.tar.bz2',
		'format' => 'tar',
		'compressor' => ['bzip2']},

	'zip' => {
		'display' => 'zip',
		'type' => 'application/x-zip',
		'suffix' => '.zip',
		'format' => 'zip'},
);

# Aliases so we understand old gitweb.snapshot values in repository
# configuration.
our %known_snapshot_format_aliases = (
	'gzip'  => 'tgz',
	'bzip2' => 'tbz2',

	# backward compatibility: legacy gitweb config support
	'x-gzip' => undef, 'gz' => undef,
	'x-bzip2' => undef, 'bz2' => undef,
	'x-zip' => undef, '' => undef,
);

# You define site-wide feature defaults here; override them with
# $GITWEB_CONFIG as necessary.
our %feature = (
	# feature => {
	# 	'sub' => feature-sub (subroutine),
	# 	'override' => allow-override (boolean),
	# 	'default' => [ default options...] (array reference)}
	#
	# if feature is overridable (it means that allow-override has true value),
	# then feature-sub will be called with default options as parameters;
	# return value of feature-sub indicates if to enable specified feature
	#
	# if there is no 'sub' key (no feature-sub), then feature cannot be
	# overriden
	#
	# use gitweb_check_feature(<feature>) to check if <feature> is enabled

	# Enable the 'blame' blob view, showing the last commit that modified
	# each line in the file. This can be very CPU-intensive.

	# To enable system wide have in $GITWEB_CONFIG
	# $feature{'blame'}{'default'} = [1];
	# To have project specific config enable override in $GITWEB_CONFIG
	# $feature{'blame'}{'override'} = 1;
	# and in project config gitweb.blame = 0|1;
	'blame' => {
		'sub' => \&feature_blame,
		'override' => 0,
		'default' => [0]},

	# Enable the 'snapshot' link, providing a compressed archive of any
	# tree. This can potentially generate high traffic if you have large
	# project.

	# Value is a list of formats defined in %known_snapshot_formats that
	# you wish to offer.
	# To disable system wide have in $GITWEB_CONFIG
	# $feature{'snapshot'}{'default'} = [];
	# To have project specific config enable override in $GITWEB_CONFIG
	# $feature{'snapshot'}{'override'} = 1;
	# and in project config, a comma-separated list of formats or "none"
	# to disable.  Example: gitweb.snapshot = tbz2,zip;
	'snapshot' => {
		'sub' => \&feature_snapshot,
		'override' => 0,
		'default' => ['tgz']},

	# Enable text search, which will list the commits which match author,
	# committer or commit text to a given string.  Enabled by default.
	# Project specific override is not supported.
	'search' => {
		'override' => 0,
		'default' => [1]},

	# Enable grep search, which will list the files in currently selected
	# tree containing the given string. Enabled by default. This can be
	# potentially CPU-intensive, of course.

	# To enable system wide have in $GITWEB_CONFIG
	# $feature{'grep'}{'default'} = [1];
	# To have project specific config enable override in $GITWEB_CONFIG
	# $feature{'grep'}{'override'} = 1;
	# and in project config gitweb.grep = 0|1;
	'grep' => {
		'override' => 0,
		'default' => [1]},

	# Enable the pickaxe search, which will list the commits that modified
	# a given string in a file. This can be practical and quite faster
	# alternative to 'blame', but still potentially CPU-intensive.

	# To enable system wide have in $GITWEB_CONFIG
	# $feature{'pickaxe'}{'default'} = [1];
	# To have project specific config enable override in $GITWEB_CONFIG
	# $feature{'pickaxe'}{'override'} = 1;
	# and in project config gitweb.pickaxe = 0|1;
	'pickaxe' => {
		'sub' => \&feature_pickaxe,
		'override' => 0,
		'default' => [1]},

	# Make gitweb use an alternative format of the URLs which can be
	# more readable and natural-looking: project name is embedded
	# directly in the path and the query string contains other
	# auxiliary information. All gitweb installations recognize
	# URL in either format; this configures in which formats gitweb
	# generates links.

	# To enable system wide have in $GITWEB_CONFIG
	# $feature{'pathinfo'}{'default'} = [1];
	# Project specific override is not supported.

	# Note that you will need to change the default location of CSS,
	# favicon, logo and possibly other files to an absolute URL. Also,
	# if gitweb.cgi serves as your indexfile, you will need to force
	# $my_uri to contain the script name in your $GITWEB_CONFIG.
	'pathinfo' => {
		'override' => 0,
		'default' => [0]},

	# Make gitweb consider projects in project root subdirectories
	# to be forks of existing projects. Given project $projname.git,
	# projects matching $projname/*.git will not be shown in the main
	# projects list, instead a '+' mark will be added to $projname
	# there and a 'forks' view will be enabled for the project, listing
	# all the forks. If project list is taken from a file, forks have
	# to be listed after the main project.

	# To enable system wide have in $GITWEB_CONFIG
	# $feature{'forks'}{'default'} = [1];
	# Project specific override is not supported.
	'forks' => {
		'override' => 0,
		'default' => [0]},
);

sub gitweb_check_feature {
	my ($name) = @_;
	return unless exists $feature{$name};
	my ($sub, $override, @defaults) = (
		$feature{$name}{'sub'},
		$feature{$name}{'override'},
		@{$feature{$name}{'default'}});
	if (!$override) { return @defaults; }
	if (!defined $sub) {
		warn "feature $name is not overrideable";
		return @defaults;
	}
	return $sub->(@defaults);
}

sub feature_blame {
	my ($val) = git_get_project_config('blame', '--bool');

	if ($val eq 'true') {
		return 1;
	} elsif ($val eq 'false') {
		return 0;
	}

	return $_[0];
}

sub feature_snapshot {
	my (@fmts) = @_;

	my ($val) = git_get_project_config('snapshot');

	if ($val) {
		@fmts = ($val eq 'none' ? () : split /\s*[,\s]\s*/, $val);
	}

	return @fmts;
}

sub feature_grep {
	my ($val) = git_get_project_config('grep', '--bool');

	if ($val eq 'true') {
		return (1);
	} elsif ($val eq 'false') {
		return (0);
	}

	return ($_[0]);
}

sub feature_pickaxe {
	my ($val) = git_get_project_config('pickaxe', '--bool');

	if ($val eq 'true') {
		return (1);
	} elsif ($val eq 'false') {
		return (0);
	}

	return ($_[0]);
}

# checking HEAD file with -e is fragile if the repository was
# initialized long time ago (i.e. symlink HEAD) and was pack-ref'ed
# and then pruned.
sub check_head_link {
	my ($dir) = @_;
	my $headfile = "$dir/HEAD";
	return ((-e $headfile) ||
		(-l $headfile && readlink($headfile) =~ /^refs\/heads\//));
}

sub check_export_ok {
	my ($dir) = @_;
	return (check_head_link($dir) &&
		(!$export_ok || -e "$dir/$export_ok"));
}

# process alternate names for backward compatibility
# filter out unsupported (unknown) snapshot formats
sub filter_snapshot_fmts {
	my @fmts = @_;

	@fmts = map {
		exists $known_snapshot_format_aliases{$_} ?
		       $known_snapshot_format_aliases{$_} : $_} @fmts;
	@fmts = grep(exists $known_snapshot_formats{$_}, @fmts);

}

our $GITWEB_CONFIG = $ENV{'GITWEB_CONFIG'} || "++GITWEB_CONFIG++";
do $GITWEB_CONFIG if -e $GITWEB_CONFIG;

# version of the core git binary
our $git_version = qx($GIT --version) =~ m/git version (.*)$/ ? $1 : "unknown";

$projects_list ||= $projectroot;

# ======================================================================
# input validation and dispatch
our $action = $cgi->param('a');
if (defined $action) {
	if ($action =~ m/[^0-9a-zA-Z\.\-_]/) {
		die_error(undef, "Invalid action parameter");
	}
}

# parameters which are pathnames
our $project = $cgi->param('p');
if (defined $project) {
	if (!validate_pathname($project) ||
	    !(-d "$projectroot/$project") ||
	    !check_head_link("$projectroot/$project") ||
	    ($export_ok && !(-e "$projectroot/$project/$export_ok")) ||
	    ($strict_export && !project_in_list($project))) {
		undef $project;
		die_error(undef, "No such project");
	}
}

our $file_name = $cgi->param('f');
if (defined $file_name) {
	if (!validate_pathname($file_name)) {
		die_error(undef, "Invalid file parameter");
	}
}

our $file_parent = $cgi->param('fp');
if (defined $file_parent) {
	if (!validate_pathname($file_parent)) {
		die_error(undef, "Invalid file parent parameter");
	}
}

# parameters which are refnames
our $hash = $cgi->param('h');
if (defined $hash) {
	if (!validate_refname($hash)) {
		die_error(undef, "Invalid hash parameter");
	}
}

our $hash_parent = $cgi->param('hp');
if (defined $hash_parent) {
	if (!validate_refname($hash_parent)) {
		die_error(undef, "Invalid hash parent parameter");
	}
}

our $hash_base = $cgi->param('hb');
if (defined $hash_base) {
	if (!validate_refname($hash_base)) {
		die_error(undef, "Invalid hash base parameter");
	}
}

my %allowed_options = (
	"--no-merges" => [ qw(rss atom log shortlog history) ],
);

our @extra_options = $cgi->param('opt');
if (defined @extra_options) {
	foreach my $opt (@extra_options) {
		if (not exists $allowed_options{$opt}) {
			die_error(undef, "Invalid option parameter");
		}
		if (not grep(/^$action$/, @{$allowed_options{$opt}})) {
			die_error(undef, "Invalid option parameter for this action");
		}
	}
}

our $hash_parent_base = $cgi->param('hpb');
if (defined $hash_parent_base) {
	if (!validate_refname($hash_parent_base)) {
		die_error(undef, "Invalid hash parent base parameter");
	}
}

# other parameters
our $page = $cgi->param('pg');
if (defined $page) {
	if ($page =~ m/[^0-9]/) {
		die_error(undef, "Invalid page parameter");
	}
}

our $searchtype = $cgi->param('st');
if (defined $searchtype) {
	if ($searchtype =~ m/[^a-z]/) {
		die_error(undef, "Invalid searchtype parameter");
	}
}

our $searchtext = $cgi->param('s');
our $search_regexp;
if (defined $searchtext) {
	if (length($searchtext) < 2) {
		die_error(undef, "At least two characters are required for search parameter");
	}
	$search_regexp = quotemeta $searchtext;
}

# now read PATH_INFO and use it as alternative to parameters
sub evaluate_path_info {
	return if defined $project;
	my $path_info = $ENV{"PATH_INFO"};
	return if !$path_info;
	$path_info =~ s,^/+,,;
	return if !$path_info;
	# find which part of PATH_INFO is project
	$project = $path_info;
	$project =~ s,/+$,,;
	while ($project && !check_head_link("$projectroot/$project")) {
		$project =~ s,/*[^/]*$,,;
	}
	# validate project
	$project = validate_pathname($project);
	if (!$project ||
	    ($export_ok && !-e "$projectroot/$project/$export_ok") ||
	    ($strict_export && !project_in_list($project))) {
		undef $project;
		return;
	}
	# do not change any parameters if an action is given using the query string
	return if $action;
	$path_info =~ s,^$project/*,,;
	my ($refname, $pathname) = split(/:/, $path_info, 2);
	if (defined $pathname) {
		# we got "project.git/branch:filename" or "project.git/branch:dir/"
		# we could use git_get_type(branch:pathname), but it needs $git_dir
		$pathname =~ s,^/+,,;
		if (!$pathname || substr($pathname, -1) eq "/") {
			$action  ||= "tree";
			$pathname =~ s,/$,,;
		} else {
			$action  ||= "blob_plain";
		}
		$hash_base ||= validate_refname($refname);
		$file_name ||= validate_pathname($pathname);
	} elsif (defined $refname) {
		# we got "project.git/branch"
		$action ||= "shortlog";
		$hash   ||= validate_refname($refname);
	}
}
evaluate_path_info();

# path to the current git repository
our $git_dir;
$git_dir = "$projectroot/$project" if $project;

# dispatch
my %actions = (
	"blame" => \&git_blame2,
	"blobdiff" => \&git_blobdiff,
	"blobdiff_plain" => \&git_blobdiff_plain,
	"blob" => \&git_blob,
	"blob_plain" => \&git_blob_plain,
	"commitdiff" => \&git_commitdiff,
	"commitdiff_plain" => \&git_commitdiff_plain,
	"commit" => \&git_commit,
	"forks" => \&git_forks,
	"heads" => \&git_heads,
	"history" => \&git_history,
	"log" => \&git_log,
	"rss" => \&git_rss,
	"atom" => \&git_atom,
	"search" => \&git_search,
	"search_help" => \&git_search_help,
	"shortlog" => \&git_shortlog,
	"summary" => \&git_summary,
	"tag" => \&git_tag,
	"tags" => \&git_tags,
	"tree" => \&git_tree,
	"snapshot" => \&git_snapshot,
	"object" => \&git_object,
	# those below don't need $project
	"opml" => \&git_opml,
	"project_list" => \&git_project_list,
	"project_index" => \&git_project_index,
);

if (!defined $action) {
	if (defined $hash) {
		$action = git_get_type($hash);
	} elsif (defined $hash_base && defined $file_name) {
		$action = git_get_type("$hash_base:$file_name");
	} elsif (defined $project) {
		$action = 'summary';
	} else {
		$action = 'project_list';
	}
}
if (!defined($actions{$action})) {
	die_error(undef, "Unknown action");
}
if ($action !~ m/^(opml|project_list|project_index)$/ &&
    !$project) {
	die_error(undef, "Project needed");
}
$actions{$action}->();
exit;

## ======================================================================
## action links

sub href(%) {
	my %params = @_;
	# default is to use -absolute url() i.e. $my_uri
	my $href = $params{-full} ? $my_url : $my_uri;

	# XXX: Warning: If you touch this, check the search form for updating,
	# too.

	my @mapping = (
		project => "p",
		action => "a",
		file_name => "f",
		file_parent => "fp",
		hash => "h",
		hash_parent => "hp",
		hash_base => "hb",
		hash_parent_base => "hpb",
		page => "pg",
		order => "o",
		searchtext => "s",
		searchtype => "st",
		snapshot_format => "sf",
		extra_options => "opt",
	);
	my %mapping = @mapping;

	$params{'project'} = $project unless exists $params{'project'};

	my ($use_pathinfo) = gitweb_check_feature('pathinfo');
	if ($use_pathinfo) {
		# use PATH_INFO for project name
		$href .= "/$params{'project'}" if defined $params{'project'};
		delete $params{'project'};

		# Summary just uses the project path URL
		if (defined $params{'action'} && $params{'action'} eq 'summary') {
			delete $params{'action'};
		}
	}

	# now encode the parameters explicitly
	my @result = ();
	for (my $i = 0; $i < @mapping; $i += 2) {
		my ($name, $symbol) = ($mapping[$i], $mapping[$i+1]);
		if (defined $params{$name}) {
			if (ref($params{$name}) eq "ARRAY") {
				foreach my $par (@{$params{$name}}) {
					push @result, $symbol . "=" . esc_param($par);
				}
			} else {
				push @result, $symbol . "=" . esc_param($params{$name});
			}
		}
	}
	$href .= "?" . join(';', @result) if scalar @result;

	return $href;
}


## ======================================================================
## validation, quoting/unquoting and escaping

sub validate_pathname {
	my $input = shift || return undef;

	# no '.' or '..' as elements of path, i.e. no '.' nor '..'
	# at the beginning, at the end, and between slashes.
	# also this catches doubled slashes
	if ($input =~ m!(^|/)(|\.|\.\.)(/|$)!) {
		return undef;
	}
	# no null characters
	if ($input =~ m!\0!) {
		return undef;
	}
	return $input;
}

sub validate_refname {
	my $input = shift || return undef;

	# textual hashes are O.K.
	if ($input =~ m/^[0-9a-fA-F]{40}$/) {
		return $input;
	}
	# it must be correct pathname
	$input = validate_pathname($input)
		or return undef;
	# restrictions on ref name according to git-check-ref-format
	if ($input =~ m!(/\.|\.\.|[\000-\040\177 ~^:?*\[]|/$)!) {
		return undef;
	}
	return $input;
}

# decode sequences of octets in utf8 into Perl's internal form,
# which is utf-8 with utf8 flag set if needed.  gitweb writes out
# in utf-8 thanks to "binmode STDOUT, ':utf8'" at beginning
sub to_utf8 {
	my $str = shift;
	my $res;
	eval { $res = decode_utf8($str, Encode::FB_CROAK); };
	if (defined $res) {
		return $res;
	} else {
		return decode($fallback_encoding, $str, Encode::FB_DEFAULT);
	}
}

# quote unsafe chars, but keep the slash, even when it's not
# correct, but quoted slashes look too horrible in bookmarks
sub esc_param {
	my $str = shift;
	$str =~ s/([^A-Za-z0-9\-_.~()\/:@])/sprintf("%%%02X", ord($1))/eg;
	$str =~ s/\+/%2B/g;
	$str =~ s/ /\+/g;
	return $str;
}

# quote unsafe chars in whole URL, so some charactrs cannot be quoted
sub esc_url {
	my $str = shift;
	$str =~ s/([^A-Za-z0-9\-_.~();\/;?:@&=])/sprintf("%%%02X", ord($1))/eg;
	$str =~ s/\+/%2B/g;
	$str =~ s/ /\+/g;
	return $str;
}

# replace invalid utf8 character with SUBSTITUTION sequence
sub esc_html ($;%) {
	my $str = shift;
	my %opts = @_;

	$str = to_utf8($str);
	$str = $cgi->escapeHTML($str);
	if ($opts{'-nbsp'}) {
		$str =~ s/ /&nbsp;/g;
	}
	$str =~ s|([[:cntrl:]])|(($1 ne "\t") ? quot_cec($1) : $1)|eg;
	return $str;
}

# quote control characters and escape filename to HTML
sub esc_path {
	my $str = shift;
	my %opts = @_;

	$str = to_utf8($str);
	$str = $cgi->escapeHTML($str);
	if ($opts{'-nbsp'}) {
		$str =~ s/ /&nbsp;/g;
	}
	$str =~ s|([[:cntrl:]])|quot_cec($1)|eg;
	return $str;
}

# Make control characters "printable", using character escape codes (CEC)
sub quot_cec {
	my $cntrl = shift;
	my %es = ( # character escape codes, aka escape sequences
		   "\t" => '\t',   # tab            (HT)
		   "\n" => '\n',   # line feed      (LF)
		   "\r" => '\r',   # carrige return (CR)
		   "\f" => '\f',   # form feed      (FF)
		   "\b" => '\b',   # backspace      (BS)
		   "\a" => '\a',   # alarm (bell)   (BEL)
		   "\e" => '\e',   # escape         (ESC)
		   "\013" => '\v', # vertical tab   (VT)
		   "\000" => '\0', # nul character  (NUL)
		   );
	my $chr = ( (exists $es{$cntrl})
		    ? $es{$cntrl}
		    : sprintf('\%03o', ord($cntrl)) );
	return "<span class=\"cntrl\">$chr</span>";
}

# Alternatively use unicode control pictures codepoints,
# Unicode "printable representation" (PR)
sub quot_upr {
	my $cntrl = shift;
	my $chr = sprintf('&#%04d;', 0x2400+ord($cntrl));
	return "<span class=\"cntrl\">$chr</span>";
}

# git may return quoted and escaped filenames
sub unquote {
	my $str = shift;

	sub unq {
		my $seq = shift;
		my %es = ( # character escape codes, aka escape sequences
			't' => "\t",   # tab            (HT, TAB)
			'n' => "\n",   # newline        (NL)
			'r' => "\r",   # return         (CR)
			'f' => "\f",   # form feed      (FF)
			'b' => "\b",   # backspace      (BS)
			'a' => "\a",   # alarm (bell)   (BEL)
			'e' => "\e",   # escape         (ESC)
			'v' => "\013", # vertical tab   (VT)
		);

		if ($seq =~ m/^[0-7]{1,3}$/) {
			# octal char sequence
			return chr(oct($seq));
		} elsif (exists $es{$seq}) {
			# C escape sequence, aka character escape code
			return $es{$seq}
		}
		# quoted ordinary character
		return $seq;
	}

	if ($str =~ m/^"(.*)"$/) {
		# needs unquoting
		$str = $1;
		$str =~ s/\\([^0-7]|[0-7]{1,3})/unq($1)/eg;
	}
	return $str;
}

# escape tabs (convert tabs to spaces)
sub untabify {
	my $line = shift;

	while ((my $pos = index($line, "\t")) != -1) {
		if (my $count = (8 - ($pos % 8))) {
			my $spaces = ' ' x $count;
			$line =~ s/\t/$spaces/;
		}
	}

	return $line;
}

sub project_in_list {
	my $project = shift;
	my @list = git_get_projects_list();
	return @list && scalar(grep { $_->{'path'} eq $project } @list);
}

## ----------------------------------------------------------------------
## HTML aware string manipulation

sub chop_str {
	my $str = shift;
	my $len = shift;
	my $add_len = shift || 10;

	# allow only $len chars, but don't cut a word if it would fit in $add_len
	# if it doesn't fit, cut it if it's still longer than the dots we would add
	$str =~ m/^(.{0,$len}[^ \/\-_:\.@]{0,$add_len})(.*)/;
	my $body = $1;
	my $tail = $2;
	if (length($tail) > 4) {
		$tail = " ...";
		$body =~ s/&[^;]*$//; # remove chopped character entities
	}
	return "$body$tail";
}

## ----------------------------------------------------------------------
## functions returning short strings

# CSS class for given age value (in seconds)
sub age_class {
	my $age = shift;

	if (!defined $age) {
		return "noage";
	} elsif ($age < 60*60*2) {
		return "age0";
	} elsif ($age < 60*60*24*2) {
		return "age1";
	} else {
		return "age2";
	}
}

# convert age in seconds to "nn units ago" string
sub age_string {
	my $age = shift;
	my $age_str;

	if ($age > 60*60*24*365*2) {
		$age_str = (int $age/60/60/24/365);
		$age_str .= " years ago";
	} elsif ($age > 60*60*24*(365/12)*2) {
		$age_str = int $age/60/60/24/(365/12);
		$age_str .= " months ago";
	} elsif ($age > 60*60*24*7*2) {
		$age_str = int $age/60/60/24/7;
		$age_str .= " weeks ago";
	} elsif ($age > 60*60*24*2) {
		$age_str = int $age/60/60/24;
		$age_str .= " days ago";
	} elsif ($age > 60*60*2) {
		$age_str = int $age/60/60;
		$age_str .= " hours ago";
	} elsif ($age > 60*2) {
		$age_str = int $age/60;
		$age_str .= " min ago";
	} elsif ($age > 2) {
		$age_str = int $age;
		$age_str .= " sec ago";
	} else {
		$age_str .= " right now";
	}
	return $age_str;
}

use constant {
	S_IFINVALID => 0030000,
	S_IFGITLINK => 0160000,
};

# submodule/subproject, a commit object reference
sub S_ISGITLINK($) {
	my $mode = shift;

	return (($mode & S_IFMT) == S_IFGITLINK)
}

# convert file mode in octal to symbolic file mode string
sub mode_str {
	my $mode = oct shift;

	if (S_ISGITLINK($mode)) {
		return 'm---------';
	} elsif (S_ISDIR($mode & S_IFMT)) {
		return 'drwxr-xr-x';
	} elsif (S_ISLNK($mode)) {
		return 'lrwxrwxrwx';
	} elsif (S_ISREG($mode)) {
		# git cares only about the executable bit
		if ($mode & S_IXUSR) {
			return '-rwxr-xr-x';
		} else {
			return '-rw-r--r--';
		};
	} else {
		return '----------';
	}
}

# convert file mode in octal to file type string
sub file_type {
	my $mode = shift;

	if ($mode !~ m/^[0-7]+$/) {
		return $mode;
	} else {
		$mode = oct $mode;
	}

	if (S_ISGITLINK($mode)) {
		return "submodule";
	} elsif (S_ISDIR($mode & S_IFMT)) {
		return "directory";
	} elsif (S_ISLNK($mode)) {
		return "symlink";
	} elsif (S_ISREG($mode)) {
		return "file";
	} else {
		return "unknown";
	}
}

# convert file mode in octal to file type description string
sub file_type_long {
	my $mode = shift;

	if ($mode !~ m/^[0-7]+$/) {
		return $mode;
	} else {
		$mode = oct $mode;
	}

	if (S_ISGITLINK($mode)) {
		return "submodule";
	} elsif (S_ISDIR($mode & S_IFMT)) {
		return "directory";
	} elsif (S_ISLNK($mode)) {
		return "symlink";
	} elsif (S_ISREG($mode)) {
		if ($mode & S_IXUSR) {
			return "executable";
		} else {
			return "file";
		};
	} else {
		return "unknown";
	}
}


## ----------------------------------------------------------------------
## functions returning short HTML fragments, or transforming HTML fragments
## which don't belong to other sections

# format line of commit message.
sub format_log_line_html {
	my $line = shift;

	$line = esc_html($line, -nbsp=>1);
	if ($line =~ m/([0-9a-fA-F]{8,40})/) {
		my $hash_text = $1;
		my $link =
			$cgi->a({-href => href(action=>"object", hash=>$hash_text),
			        -class => "text"}, $hash_text);
		$line =~ s/$hash_text/$link/;
	}
	return $line;
}

# format marker of refs pointing to given object
sub format_ref_marker {
	my ($refs, $id) = @_;
	my $markers = '';

	if (defined $refs->{$id}) {
		foreach my $ref (@{$refs->{$id}}) {
			my ($type, $name) = qw();
			# e.g. tags/v2.6.11 or heads/next
			if ($ref =~ m!^(.*?)s?/(.*)$!) {
				$type = $1;
				$name = $2;
			} else {
				$type = "ref";
				$name = $ref;
			}

			$markers .= " <span class=\"$type\" title=\"$ref\">" .
			            esc_html($name) . "</span>";
		}
	}

	if ($markers) {
		return ' <span class="refs">'. $markers . '</span>';
	} else {
		return "";
	}
}

# format, perhaps shortened and with markers, title line
sub format_subject_html {
	my ($long, $short, $href, $extra) = @_;
	$extra = '' unless defined($extra);

	if (length($short) < length($long)) {
		return $cgi->a({-href => $href, -class => "list subject",
		                -title => to_utf8($long)},
		       esc_html($short) . $extra);
	} else {
		return $cgi->a({-href => $href, -class => "list subject"},
		       esc_html($long)  . $extra);
	}
}

# format git diff header line, i.e. "diff --(git|combined|cc) ..."
sub format_git_diff_header_line {
	my $line = shift;
	my $diffinfo = shift;
	my ($from, $to) = @_;

	if ($diffinfo->{'nparents'}) {
		# combined diff
		$line =~ s!^(diff (.*?) )"?.*$!$1!;
		if ($to->{'href'}) {
			$line .= $cgi->a({-href => $to->{'href'}, -class => "path"},
			                 esc_path($to->{'file'}));
		} else { # file was deleted (no href)
			$line .= esc_path($to->{'file'});
		}
	} else {
		# "ordinary" diff
		$line =~ s!^(diff (.*?) )"?a/.*$!$1!;
		if ($from->{'href'}) {
			$line .= $cgi->a({-href => $from->{'href'}, -class => "path"},
			                 'a/' . esc_path($from->{'file'}));
		} else { # file was added (no href)
			$line .= 'a/' . esc_path($from->{'file'});
		}
		$line .= ' ';
		if ($to->{'href'}) {
			$line .= $cgi->a({-href => $to->{'href'}, -class => "path"},
			                 'b/' . esc_path($to->{'file'}));
		} else { # file was deleted
			$line .= 'b/' . esc_path($to->{'file'});
		}
	}

	return "<div class=\"diff header\">$line</div>\n";
}

# format extended diff header line, before patch itself
sub format_extended_diff_header_line {
	my $line = shift;
	my $diffinfo = shift;
	my ($from, $to) = @_;

	# match <path>
	if ($line =~ s!^((copy|rename) from ).*$!$1! && $from->{'href'}) {
		$line .= $cgi->a({-href=>$from->{'href'}, -class=>"path"},
		                       esc_path($from->{'file'}));
	}
	if ($line =~ s!^((copy|rename) to ).*$!$1! && $to->{'href'}) {
		$line .= $cgi->a({-href=>$to->{'href'}, -class=>"path"},
		                 esc_path($to->{'file'}));
	}
	# match single <mode>
	if ($line =~ m/\s(\d{6})$/) {
		$line .= '<span class="info"> (' .
		         file_type_long($1) .
		         ')</span>';
	}
	# match <hash>
	if ($line =~ m/^index [0-9a-fA-F]{40},[0-9a-fA-F]{40}/) {
		# can match only for combined diff
		$line = 'index ';
		for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
			if ($from->{'href'}[$i]) {
				$line .= $cgi->a({-href=>$from->{'href'}[$i],
				                  -class=>"hash"},
				                 substr($diffinfo->{'from_id'}[$i],0,7));
			} else {
				$line .= '0' x 7;
			}
			# separator
			$line .= ',' if ($i < $diffinfo->{'nparents'} - 1);
		}
		$line .= '..';
		if ($to->{'href'}) {
			$line .= $cgi->a({-href=>$to->{'href'}, -class=>"hash"},
			                 substr($diffinfo->{'to_id'},0,7));
		} else {
			$line .= '0' x 7;
		}

	} elsif ($line =~ m/^index [0-9a-fA-F]{40}..[0-9a-fA-F]{40}/) {
		# can match only for ordinary diff
		my ($from_link, $to_link);
		if ($from->{'href'}) {
			$from_link = $cgi->a({-href=>$from->{'href'}, -class=>"hash"},
			                     substr($diffinfo->{'from_id'},0,7));
		} else {
			$from_link = '0' x 7;
		}
		if ($to->{'href'}) {
			$to_link = $cgi->a({-href=>$to->{'href'}, -class=>"hash"},
			                   substr($diffinfo->{'to_id'},0,7));
		} else {
			$to_link = '0' x 7;
		}
		my ($from_id, $to_id) = ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
		$line =~ s!$from_id\.\.$to_id!$from_link..$to_link!;
	}

	return $line . "<br/>\n";
}

# format from-file/to-file diff header
sub format_diff_from_to_header {
	my ($from_line, $to_line, $diffinfo, $from, $to, @parents) = @_;
	my $line;
	my $result = '';

	$line = $from_line;
	#assert($line =~ m/^---/) if DEBUG;
	# no extra formatting for "^--- /dev/null"
	if (! $diffinfo->{'nparents'}) {
		# ordinary (single parent) diff
		if ($line =~ m!^--- "?a/!) {
			if ($from->{'href'}) {
				$line = '--- a/' .
				        $cgi->a({-href=>$from->{'href'}, -class=>"path"},
				                esc_path($from->{'file'}));
			} else {
				$line = '--- a/' .
				        esc_path($from->{'file'});
			}
		}
		$result .= qq!<div class="diff from_file">$line</div>\n!;

	} else {
		# combined diff (merge commit)
		for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
			if ($from->{'href'}[$i]) {
				$line = '--- ' .
				        $cgi->a({-href=>href(action=>"blobdiff",
				                             hash_parent=>$diffinfo->{'from_id'}[$i],
				                             hash_parent_base=>$parents[$i],
				                             file_parent=>$from->{'file'}[$i],
				                             hash=>$diffinfo->{'to_id'},
				                             hash_base=>$hash,
				                             file_name=>$to->{'file'}),
				                 -class=>"path",
				                 -title=>"diff" . ($i+1)},
				                $i+1) .
				        '/' .
				        $cgi->a({-href=>$from->{'href'}[$i], -class=>"path"},
				                esc_path($from->{'file'}[$i]));
			} else {
				$line = '--- /dev/null';
			}
			$result .= qq!<div class="diff from_file">$line</div>\n!;
		}
	}

	$line = $to_line;
	#assert($line =~ m/^\+\+\+/) if DEBUG;
	# no extra formatting for "^+++ /dev/null"
	if ($line =~ m!^\+\+\+ "?b/!) {
		if ($to->{'href'}) {
			$line = '+++ b/' .
			        $cgi->a({-href=>$to->{'href'}, -class=>"path"},
			                esc_path($to->{'file'}));
		} else {
			$line = '+++ b/' .
			        esc_path($to->{'file'});
		}
	}
	$result .= qq!<div class="diff to_file">$line</div>\n!;

	return $result;
}

# create note for patch simplified by combined diff
sub format_diff_cc_simplified {
	my ($diffinfo, @parents) = @_;
	my $result = '';

	$result .= "<div class=\"diff header\">" .
	           "diff --cc ";
	if (!is_deleted($diffinfo)) {
		$result .= $cgi->a({-href => href(action=>"blob",
		                                  hash_base=>$hash,
		                                  hash=>$diffinfo->{'to_id'},
		                                  file_name=>$diffinfo->{'to_file'}),
		                    -class => "path"},
		                   esc_path($diffinfo->{'to_file'}));
	} else {
		$result .= esc_path($diffinfo->{'to_file'});
	}
	$result .= "</div>\n" . # class="diff header"
	           "<div class=\"diff nodifferences\">" .
	           "Simple merge" .
	           "</div>\n"; # class="diff nodifferences"

	return $result;
}

# format patch (diff) line (not to be used for diff headers)
sub format_diff_line {
	my $line = shift;
	my ($from, $to) = @_;
	my $diff_class = "";

	chomp $line;

	if ($from && $to && ref($from->{'href'}) eq "ARRAY") {
		# combined diff
		my $prefix = substr($line, 0, scalar @{$from->{'href'}});
		if ($line =~ m/^\@{3}/) {
			$diff_class = " chunk_header";
		} elsif ($line =~ m/^\\/) {
			$diff_class = " incomplete";
		} elsif ($prefix =~ tr/+/+/) {
			$diff_class = " add";
		} elsif ($prefix =~ tr/-/-/) {
			$diff_class = " rem";
		}
	} else {
		# assume ordinary diff
		my $char = substr($line, 0, 1);
		if ($char eq '+') {
			$diff_class = " add";
		} elsif ($char eq '-') {
			$diff_class = " rem";
		} elsif ($char eq '@') {
			$diff_class = " chunk_header";
		} elsif ($char eq "\\") {
			$diff_class = " incomplete";
		}
	}
	$line = untabify($line);
	if ($from && $to && $line =~ m/^\@{2} /) {
		my ($from_text, $from_start, $from_lines, $to_text, $to_start, $to_lines, $section) =
			$line =~ m/^\@{2} (-(\d+)(?:,(\d+))?) (\+(\d+)(?:,(\d+))?) \@{2}(.*)$/;

		$from_lines = 0 unless defined $from_lines;
		$to_lines   = 0 unless defined $to_lines;

		if ($from->{'href'}) {
			$from_text = $cgi->a({-href=>"$from->{'href'}#l$from_start",
			                     -class=>"list"}, $from_text);
		}
		if ($to->{'href'}) {
			$to_text   = $cgi->a({-href=>"$to->{'href'}#l$to_start",
			                     -class=>"list"}, $to_text);
		}
		$line = "<span class=\"chunk_info\">@@ $from_text $to_text @@</span>" .
		        "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
		return "<div class=\"diff$diff_class\">$line</div>\n";
	} elsif ($from && $to && $line =~ m/^\@{3}/) {
		my ($prefix, $ranges, $section) = $line =~ m/^(\@+) (.*?) \@+(.*)$/;
		my (@from_text, @from_start, @from_nlines, $to_text, $to_start, $to_nlines);

		@from_text = split(' ', $ranges);
		for (my $i = 0; $i < @from_text; ++$i) {
			($from_start[$i], $from_nlines[$i]) =
				(split(',', substr($from_text[$i], 1)), 0);
		}

		$to_text   = pop @from_text;
		$to_start  = pop @from_start;
		$to_nlines = pop @from_nlines;

		$line = "<span class=\"chunk_info\">$prefix ";
		for (my $i = 0; $i < @from_text; ++$i) {
			if ($from->{'href'}[$i]) {
				$line .= $cgi->a({-href=>"$from->{'href'}[$i]#l$from_start[$i]",
				                  -class=>"list"}, $from_text[$i]);
			} else {
				$line .= $from_text[$i];
			}
			$line .= " ";
		}
		if ($to->{'href'}) {
			$line .= $cgi->a({-href=>"$to->{'href'}#l$to_start",
			                  -class=>"list"}, $to_text);
		} else {
			$line .= $to_text;
		}
		$line .= " $prefix</span>" .
		         "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
		return "<div class=\"diff$diff_class\">$line</div>\n";
	}
	return "<div class=\"diff$diff_class\">" . esc_html($line, -nbsp=>1) . "</div>\n";
}

# Generates undef or something like "_snapshot_" or "snapshot (_tbz2_ _zip_)",
# linked.  Pass the hash of the tree/commit to snapshot.
sub format_snapshot_links {
	my ($hash) = @_;
	my @snapshot_fmts = gitweb_check_feature('snapshot');
	@snapshot_fmts = filter_snapshot_fmts(@snapshot_fmts);
	my $num_fmts = @snapshot_fmts;
	if ($num_fmts > 1) {
		# A parenthesized list of links bearing format names.
		# e.g. "snapshot (_tar.gz_ _zip_)"
		return "snapshot (" . join(' ', map
			$cgi->a({
				-href => href(
					action=>"snapshot",
					hash=>$hash,
					snapshot_format=>$_
				)
			}, $known_snapshot_formats{$_}{'display'})
		, @snapshot_fmts) . ")";
	} elsif ($num_fmts == 1) {
		# A single "snapshot" link whose tooltip bears the format name.
		# i.e. "_snapshot_"
		my ($fmt) = @snapshot_fmts;
		return
			$cgi->a({
				-href => href(
					action=>"snapshot",
					hash=>$hash,
					snapshot_format=>$fmt
				),
				-title => "in format: $known_snapshot_formats{$fmt}{'display'}"
			}, "snapshot");
	} else { # $num_fmts == 0
		return undef;
	}
}

## ----------------------------------------------------------------------
## git utility subroutines, invoking git commands

# returns path to the core git executable and the --git-dir parameter as list
sub git_cmd {
	return $GIT, '--git-dir='.$git_dir;
}

# returns path to the core git executable and the --git-dir parameter as string
sub git_cmd_str {
	return join(' ', git_cmd());
}

# get HEAD ref of given project as hash
sub git_get_head_hash {
	my $project = shift;
	my $o_git_dir = $git_dir;
	my $retval = undef;
	$git_dir = "$projectroot/$project";
	if (open my $fd, "-|", git_cmd(), "rev-parse", "--verify", "HEAD") {
		my $head = <$fd>;
		close $fd;
		if (defined $head && $head =~ /^([0-9a-fA-F]{40})$/) {
			$retval = $1;
		}
	}
	if (defined $o_git_dir) {
		$git_dir = $o_git_dir;
	}
	return $retval;
}

# get type of given object
sub git_get_type {
	my $hash = shift;

	open my $fd, "-|", git_cmd(), "cat-file", '-t', $hash or return;
	my $type = <$fd>;
	close $fd or return;
	chomp $type;
	return $type;
}

sub git_get_project_config {
	my ($key, $type) = @_;

	return unless ($key);
	$key =~ s/^gitweb\.//;
	return if ($key =~ m/\W/);

	my @x = (git_cmd(), 'config');
	if (defined $type) { push @x, $type; }
	push @x, "--get";
	push @x, "gitweb.$key";
	my $val = qx(@x);
	chomp $val;
	return ($val);
}

# get hash of given path at given ref
sub git_get_hash_by_path {
	my $base = shift;
	my $path = shift || return undef;
	my $type = shift;

	$path =~ s,/+$,,;

	open my $fd, "-|", git_cmd(), "ls-tree", $base, "--", $path
		or die_error(undef, "Open git-ls-tree failed");
	my $line = <$fd>;
	close $fd or return undef;

	if (!defined $line) {
		# there is no tree or hash given by $path at $base
		return undef;
	}

	#'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa	panic.c'
	$line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t/;
	if (defined $type && $type ne $2) {
		# type doesn't match
		return undef;
	}
	return $3;
}

# get path of entry with given hash at given tree-ish (ref)
# used to get 'from' filename for combined diff (merge commit) for renames
sub git_get_path_by_hash {
	my $base = shift || return;
	my $hash = shift || return;

	local $/ = "\0";

	open my $fd, "-|", git_cmd(), "ls-tree", '-r', '-t', '-z', $base
		or return undef;
	while (my $line = <$fd>) {
		chomp $line;

		#'040000 tree 595596a6a9117ddba9fe379b6b012b558bac8423	gitweb'
		#'100644 blob e02e90f0429be0d2a69b76571101f20b8f75530f	gitweb/README'
		if ($line =~ m/(?:[0-9]+) (?:.+) $hash\t(.+)$/) {
			close $fd;
			return $1;
		}
	}
	close $fd;
	return undef;
}

## ......................................................................
## git utility functions, directly accessing git repository

sub git_get_project_description {
	my $path = shift;

	open my $fd, "$projectroot/$path/description" or return undef;
	my $descr = <$fd>;
	close $fd;
	if (defined $descr) {
		chomp $descr;
	}
	return $descr;
}

sub git_get_project_url_list {
	my $path = shift;

	open my $fd, "$projectroot/$path/cloneurl" or return;
	my @git_project_url_list = map { chomp; $_ } <$fd>;
	close $fd;

	return wantarray ? @git_project_url_list : \@git_project_url_list;
}

sub git_get_projects_list {
	my ($filter) = @_;
	my @list;

	$filter ||= '';
	$filter =~ s/\.git$//;

	my ($check_forks) = gitweb_check_feature('forks');

	if (-d $projects_list) {
		# search in directory
		my $dir = $projects_list . ($filter ? "/$filter" : '');
		# remove the trailing "/"
		$dir =~ s!/+$!!;
		my $pfxlen = length("$dir");

		File::Find::find({
			follow_fast => 1, # follow symbolic links
			follow_skip => 2, # ignore duplicates
			dangling_symlinks => 0, # ignore dangling symlinks, silently
			wanted => sub {
				# skip project-list toplevel, if we get it.
				return if (m!^[/.]$!);
				# only directories can be git repositories
				return unless (-d $_);

				my $subdir = substr($File::Find::name, $pfxlen + 1);
				# we check related file in $projectroot
				if ($check_forks and $subdir =~ m#/.#) {
					$File::Find::prune = 1;
				} elsif (check_export_ok("$projectroot/$filter/$subdir")) {
					push @list, { path => ($filter ? "$filter/" : '') . $subdir };
					$File::Find::prune = 1;
				}
			},
		}, "$dir");

	} elsif (-f $projects_list) {
		# read from file(url-encoded):
		# 'git%2Fgit.git Linus+Torvalds'
		# 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
		# 'linux%2Fhotplug%2Fudev.git Greg+Kroah-Hartman'
		my %paths;
		open my ($fd), $projects_list or return;
	PROJECT:
		while (my $line = <$fd>) {
			chomp $line;
			my ($path, $owner) = split ' ', $line;
			$path = unescape($path);
			$owner = unescape($owner);
			if (!defined $path) {
				next;
			}
			if ($filter ne '') {
				# looking for forks;
				my $pfx = substr($path, 0, length($filter));
				if ($pfx ne $filter) {
					next PROJECT;
				}
				my $sfx = substr($path, length($filter));
				if ($sfx !~ /^\/.*\.git$/) {
					next PROJECT;
				}
			} elsif ($check_forks) {
			PATH:
				foreach my $filter (keys %paths) {
					# looking for forks;
					my $pfx = substr($path, 0, length($filter));
					if ($pfx ne $filter) {
						next PATH;
					}
					my $sfx = substr($path, length($filter));
					if ($sfx !~ /^\/.*\.git$/) {
						next PATH;
					}
					# is a fork, don't include it in
					# the list
					next PROJECT;
				}
			}
			if (check_export_ok("$projectroot/$path")) {
				my $pr = {
					path => $path,
					owner => to_utf8($owner),
				};
				push @list, $pr;
				(my $forks_path = $path) =~ s/\.git$//;
				$paths{$forks_path}++;
			}
		}
		close $fd;
	}
	return @list;
}

our $gitweb_project_owner = undef;
sub git_get_project_list_from_file {

	return if (defined $gitweb_project_owner);

	$gitweb_project_owner = {};
	# read from file (url-encoded):
	# 'git%2Fgit.git Linus+Torvalds'
	# 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
	# 'linux%2Fhotplug%2Fudev.git Greg+Kroah-Hartman'
	if (-f $projects_list) {
		open (my $fd , $projects_list);
		while (my $line = <$fd>) {
			chomp $line;
			my ($pr, $ow) = split ' ', $line;
			$pr = unescape($pr);
			$ow = unescape($ow);
			$gitweb_project_owner->{$pr} = to_utf8($ow);
		}
		close $fd;
	}
}

sub git_get_project_owner {
	my $project = shift;
	my $owner;

	return undef unless $project;

	if (!defined $gitweb_project_owner) {
		git_get_project_list_from_file();
	}

	if (exists $gitweb_project_owner->{$project}) {
		$owner = $gitweb_project_owner->{$project};
	}
	if (!defined $owner) {
		$owner = get_file_owner("$projectroot/$project");
	}

	return $owner;
}

sub git_get_last_activity {
	my ($path) = @_;
	my $fd;

	$git_dir = "$projectroot/$path";
	open($fd, "-|", git_cmd(), 'for-each-ref',
	     '--format=%(committer)',
	     '--sort=-committerdate',
	     '--count=1',
	     'refs/heads') or return;
	my $most_recent = <$fd>;
	close $fd or return;
	if (defined $most_recent &&
	    $most_recent =~ / (\d+) [-+][01]\d\d\d$/) {
		my $timestamp = $1;
		my $age = time - $timestamp;
		return ($age, age_string($age));
	}
	return (undef, undef);
}

sub git_get_references {
	my $type = shift || "";
	my %refs;
	# 5dc01c595e6c6ec9ccda4f6f69c131c0dd945f8c refs/tags/v2.6.11
	# c39ae07f393806ccf406ef966e9a15afc43cc36a refs/tags/v2.6.11^{}
	open my $fd, "-|", git_cmd(), "show-ref", "--dereference",
		($type ? ("--", "refs/$type") : ()) # use -- <pattern> if $type
		or return;

	while (my $line = <$fd>) {
		chomp $line;
		if ($line =~ m!^([0-9a-fA-F]{40})\srefs/($type/?[^^]+)!) {
			if (defined $refs{$1}) {
				push @{$refs{$1}}, $2;
			} else {
				$refs{$1} = [ $2 ];
			}
		}
	}
	close $fd or return;
	return \%refs;
}

sub git_get_rev_name_tags {
	my $hash = shift || return undef;

	open my $fd, "-|", git_cmd(), "name-rev", "--tags", $hash
		or return;
	my $name_rev = <$fd>;
	close $fd;

	if ($name_rev =~ m|^$hash tags/(.*)$|) {
		return $1;
	} else {
		# catches also '$hash undefined' output
		return undef;
	}
}

## ----------------------------------------------------------------------
## parse to hash functions

sub parse_date {
	my $epoch = shift;
	my $tz = shift || "-0000";

	my %date;
	my @months = ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
	my @days = ("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat");
	my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($epoch);
	$date{'hour'} = $hour;
	$date{'minute'} = $min;
	$date{'mday'} = $mday;
	$date{'day'} = $days[$wday];
	$date{'month'} = $months[$mon];
	$date{'rfc2822'}   = sprintf "%s, %d %s %4d %02d:%02d:%02d +0000",
	                     $days[$wday], $mday, $months[$mon], 1900+$year, $hour ,$min, $sec;
	$date{'mday-time'} = sprintf "%d %s %02d:%02d",
	                     $mday, $months[$mon], $hour ,$min;
	$date{'iso-8601'}  = sprintf "%04d-%02d-%02dT%02d:%02d:%02dZ",
	                     1900+$year, $mon, $mday, $hour ,$min, $sec;

	$tz =~ m/^([+\-][0-9][0-9])([0-9][0-9])$/;
	my $local = $epoch + ((int $1 + ($2/60)) * 3600);
	($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($local);
	$date{'hour_local'} = $hour;
	$date{'minute_local'} = $min;
	$date{'tz_local'} = $tz;
	$date{'iso-tz'} = sprintf("%04d-%02d-%02d %02d:%02d:%02d %s",
	                          1900+$year, $mon+1, $mday,
	                          $hour, $min, $sec, $tz);
	return %date;
}

sub parse_tag {
	my $tag_id = shift;
	my %tag;
	my @comment;

	open my $fd, "-|", git_cmd(), "cat-file", "tag", $tag_id or return;
	$tag{'id'} = $tag_id;
	while (my $line = <$fd>) {
		chomp $line;
		if ($line =~ m/^object ([0-9a-fA-F]{40})$/) {
			$tag{'object'} = $1;
		} elsif ($line =~ m/^type (.+)$/) {
			$tag{'type'} = $1;
		} elsif ($line =~ m/^tag (.+)$/) {
			$tag{'name'} = $1;
		} elsif ($line =~ m/^tagger (.*) ([0-9]+) (.*)$/) {
			$tag{'author'} = $1;
			$tag{'epoch'} = $2;
			$tag{'tz'} = $3;
		} elsif ($line =~ m/--BEGIN/) {
			push @comment, $line;
			last;
		} elsif ($line eq "") {
			last;
		}
	}
	push @comment, <$fd>;
	$tag{'comment'} = \@comment;
	close $fd or return;
	if (!defined $tag{'name'}) {
		return
	};
	return %tag
}

sub parse_commit_text {
	my ($commit_text, $withparents) = @_;
	my @commit_lines = split '\n', $commit_text;
	my %co;

	pop @commit_lines; # Remove '\0'

	if (! @commit_lines) {
		return;
	}

	my $header = shift @commit_lines;
	if ($header !~ m/^[0-9a-fA-F]{40}/) {
		return;
	}
	($co{'id'}, my @parents) = split ' ', $header;
	while (my $line = shift @commit_lines) {
		last if $line eq "\n";
		if ($line =~ m/^tree ([0-9a-fA-F]{40})$/) {
			$co{'tree'} = $1;
		} elsif ((!defined $withparents) && ($line =~ m/^parent ([0-9a-fA-F]{40})$/)) {
			push @parents, $1;
		} elsif ($line =~ m/^author (.*) ([0-9]+) (.*)$/) {
			$co{'author'} = $1;
			$co{'author_epoch'} = $2;
			$co{'author_tz'} = $3;
			if ($co{'author'} =~ m/^([^<]+) <([^>]*)>/) {
				$co{'author_name'}  = $1;
				$co{'author_email'} = $2;
			} else {
				$co{'author_name'} = $co{'author'};
			}
		} elsif ($line =~ m/^committer (.*) ([0-9]+) (.*)$/) {
			$co{'committer'} = $1;
			$co{'committer_epoch'} = $2;
			$co{'committer_tz'} = $3;
			$co{'committer_name'} = $co{'committer'};
			if ($co{'committer'} =~ m/^([^<]+) <([^>]*)>/) {
				$co{'committer_name'}  = $1;
				$co{'committer_email'} = $2;
			} else {
				$co{'committer_name'} = $co{'committer'};
			}
		}
	}
	if (!defined $co{'tree'}) {
		return;
	};
	$co{'parents'} = \@parents;
	$co{'parent'} = $parents[0];

	foreach my $title (@commit_lines) {
		$title =~ s/^    //;
		if ($title ne "") {
			$co{'title'} = chop_str($title, 80, 5);
			# remove leading stuff of merges to make the interesting part visible
			if (length($title) > 50) {
				$title =~ s/^Automatic //;
				$title =~ s/^merge (of|with) /Merge ... /i;
				if (length($title) > 50) {
					$title =~ s/(http|rsync):\/\///;
				}
				if (length($title) > 50) {
					$title =~ s/(master|www|rsync)\.//;
				}
				if (length($title) > 50) {
					$title =~ s/kernel.org:?//;
				}
				if (length($title) > 50) {
					$title =~ s/\/pub\/scm//;
				}
			}
			$co{'title_short'} = chop_str($title, 50, 5);
			last;
		}
	}
	if ($co{'title'} eq "") {
		$co{'title'} = $co{'title_short'} = '(no commit message)';
	}
	# remove added spaces
	foreach my $line (@commit_lines) {
		$line =~ s/^    //;
	}
	$co{'comment'} = \@commit_lines;

	my $age = time - $co{'committer_epoch'};
	$co{'age'} = $age;
	$co{'age_string'} = age_string($age);
	my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($co{'committer_epoch'});
	if ($age > 60*60*24*7*2) {
		$co{'age_string_date'} = sprintf "%4i-%02u-%02i", 1900 + $year, $mon+1, $mday;
		$co{'age_string_age'} = $co{'age_string'};
	} else {
		$co{'age_string_date'} = $co{'age_string'};
		$co{'age_string_age'} = sprintf "%4i-%02u-%02i", 1900 + $year, $mon+1, $mday;
	}
	return %co;
}

sub parse_commit {
	my ($commit_id) = @_;
	my %co;

	local $/ = "\0";

	open my $fd, "-|", git_cmd(), "rev-list",
		"--parents",
		"--header",
		"--max-count=1",
		$commit_id,
		"--",
		or die_error(undef, "Open git-rev-list failed");
	%co = parse_commit_text(<$fd>, 1);
	close $fd;

	return %co;
}

sub parse_commits {
	my ($commit_id, $maxcount, $skip, $arg, $filename) = @_;
	my @cos;

	$maxcount ||= 1;
	$skip ||= 0;

	local $/ = "\0";

	open my $fd, "-|", git_cmd(), "rev-list",
		"--header",
		($arg ? ($arg) : ()),
		("--max-count=" . $maxcount),
		("--skip=" . $skip),
		@extra_options,
		$commit_id,
		"--",
		($filename ? ($filename) : ())
		or die_error(undef, "Open git-rev-list failed");
	while (my $line = <$fd>) {
		my %co = parse_commit_text($line);
		push @cos, \%co;
	}
	close $fd;

	return wantarray ? @cos : \@cos;
}

# parse ref from ref_file, given by ref_id, with given type
sub parse_ref {
	my $ref_file = shift;
	my $ref_id = shift;
	my $type = shift || git_get_type($ref_id);
	my %ref_item;

	$ref_item{'type'} = $type;
	$ref_item{'id'} = $ref_id;
	$ref_item{'epoch'} = 0;
	$ref_item{'age'} = "unknown";
	if ($type eq "tag") {
		my %tag = parse_tag($ref_id);
		$ref_item{'comment'} = $tag{'comment'};
		if ($tag{'type'} eq "commit") {
			my %co = parse_commit($tag{'object'});
			$ref_item{'epoch'} = $co{'committer_epoch'};
			$ref_item{'age'} = $co{'age_string'};
		} elsif (defined($tag{'epoch'})) {
			my $age = time - $tag{'epoch'};
			$ref_item{'epoch'} = $tag{'epoch'};
			$ref_item{'age'} = age_string($age);
		}
		$ref_item{'reftype'} = $tag{'type'};
		$ref_item{'name'} = $tag{'name'};
		$ref_item{'refid'} = $tag{'object'};
	} elsif ($type eq "commit"){
		my %co = parse_commit($ref_id);
		$ref_item{'reftype'} = "commit";
		$ref_item{'name'} = $ref_file;
		$ref_item{'title'} = $co{'title'};
		$ref_item{'refid'} = $ref_id;
		$ref_item{'epoch'} = $co{'committer_epoch'};
		$ref_item{'age'} = $co{'age_string'};
	} else {
		$ref_item{'reftype'} = $type;
		$ref_item{'name'} = $ref_file;
		$ref_item{'refid'} = $ref_id;
	}

	return %ref_item;
}

# parse line of git-diff-tree "raw" output
sub parse_difftree_raw_line {
	my $line = shift;
	my %res;

	# ':100644 100644 03b218260e99b78c6df0ed378e59ed9205ccc96d 3b93d5e7cc7f7dd4ebed13a5cc1a4ad976fc94d8 M	ls-files.c'
	# ':100644 100644 7f9281985086971d3877aca27704f2aaf9c448ce bc190ebc71bbd923f2b728e505408f5e54bd073a M	rev-tree.c'
	if ($line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)([0-9]{0,3})\t(.*)$/) {
		$res{'from_mode'} = $1;
		$res{'to_mode'} = $2;
		$res{'from_id'} = $3;
		$res{'to_id'} = $4;
		$res{'status'} = $5;
		$res{'similarity'} = $6;
		if ($res{'status'} eq 'R' || $res{'status'} eq 'C') { # renamed or copied
			($res{'from_file'}, $res{'to_file'}) = map { unquote($_) } split("\t", $7);
		} else {
			$res{'file'} = unquote($7);
		}
	}
	# '::100755 100755 100755 60e79ca1b01bc8b057abe17ddab484699a7f5fdb 94067cc5f73388f33722d52ae02f44692bc07490 94067cc5f73388f33722d52ae02f44692bc07490 MR	git-gui/git-gui.sh'
	# combined diff (for merge commit)
	elsif ($line =~ s/^(::+)((?:[0-7]{6} )+)((?:[0-9a-fA-F]{40} )+)([a-zA-Z]+)\t(.*)$//) {
		$res{'nparents'}  = length($1);
		$res{'from_mode'} = [ split(' ', $2) ];
		$res{'to_mode'} = pop @{$res{'from_mode'}};
		$res{'from_id'} = [ split(' ', $3) ];
		$res{'to_id'} = pop @{$res{'from_id'}};
		$res{'status'} = [ split('', $4) ];
		$res{'to_file'} = unquote($5);
	}
	# 'c512b523472485aef4fff9e57b229d9d243c967f'
	elsif ($line =~ m/^([0-9a-fA-F]{40})$/) {
		$res{'commit'} = $1;
	}

	return wantarray ? %res : \%res;
}

# parse line of git-ls-tree output
sub parse_ls_tree_line ($;%) {
	my $line = shift;
	my %opts = @_;
	my %res;

	#'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa	panic.c'
	$line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t(.+)$/s;

	$res{'mode'} = $1;
	$res{'type'} = $2;
	$res{'hash'} = $3;
	if ($opts{'-z'}) {
		$res{'name'} = $4;
	} else {
		$res{'name'} = unquote($4);
	}

	return wantarray ? %res : \%res;
}

# generates _two_ hashes, references to which are passed as 2 and 3 argument
sub parse_from_to_diffinfo {
	my ($diffinfo, $from, $to, @parents) = @_;

	if ($diffinfo->{'nparents'}) {
		# combined diff
		$from->{'file'} = [];
		$from->{'href'} = [];
		fill_from_file_info($diffinfo, @parents)
			unless exists $diffinfo->{'from_file'};
		for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
			$from->{'file'}[$i] = $diffinfo->{'from_file'}[$i] || $diffinfo->{'to_file'};
			if ($diffinfo->{'status'}[$i] ne "A") { # not new (added) file
				$from->{'href'}[$i] = href(action=>"blob",
				                           hash_base=>$parents[$i],
				                           hash=>$diffinfo->{'from_id'}[$i],
				                           file_name=>$from->{'file'}[$i]);
			} else {
				$from->{'href'}[$i] = undef;
			}
		}
	} else {
		$from->{'file'} = $diffinfo->{'from_file'} || $diffinfo->{'file'};
		if ($diffinfo->{'status'} ne "A") { # not new (added) file
			$from->{'href'} = href(action=>"blob", hash_base=>$hash_parent,
			                       hash=>$diffinfo->{'from_id'},
			                       file_name=>$from->{'file'});
		} else {
			delete $from->{'href'};
		}
	}

	$to->{'file'} = $diffinfo->{'to_file'} || $diffinfo->{'file'};
	if (!is_deleted($diffinfo)) { # file exists in result
		$to->{'href'} = href(action=>"blob", hash_base=>$hash,
		                     hash=>$diffinfo->{'to_id'},
		                     file_name=>$to->{'file'});
	} else {
		delete $to->{'href'};
	}
}

## ......................................................................
## parse to array of hashes functions

sub git_get_heads_list {
	my $limit = shift;
	my @headslist;

	open my $fd, '-|', git_cmd(), 'for-each-ref',
		($limit ? '--count='.($limit+1) : ()), '--sort=-committerdate',
		'--format=%(objectname) %(refname) %(subject)%00%(committer)',
		'refs/heads'
		or return;
	while (my $line = <$fd>) {
		my %ref_item;

		chomp $line;
		my ($refinfo, $committerinfo) = split(/\0/, $line);
		my ($hash, $name, $title) = split(' ', $refinfo, 3);
		my ($committer, $epoch, $tz) =
			($committerinfo =~ /^(.*) ([0-9]+) (.*)$/);
		$name =~ s!^refs/heads/!!;

		$ref_item{'name'}  = $name;
		$ref_item{'id'}    = $hash;
		$ref_item{'title'} = $title || '(no commit message)';
		$ref_item{'epoch'} = $epoch;
		if ($epoch) {
			$ref_item{'age'} = age_string(time - $ref_item{'epoch'});
		} else {
			$ref_item{'age'} = "unknown";
		}

		push @headslist, \%ref_item;
	}
	close $fd;

	return wantarray ? @headslist : \@headslist;
}

sub git_get_tags_list {
	my $limit = shift;
	my @tagslist;

	open my $fd, '-|', git_cmd(), 'for-each-ref',
		($limit ? '--count='.($limit+1) : ()), '--sort=-creatordate',
		'--format=%(objectname) %(objecttype) %(refname) '.
		'%(*objectname) %(*objecttype) %(subject)%00%(creator)',
		'refs/tags'
		or return;
	while (my $line = <$fd>) {
		my %ref_item;

		chomp $line;
		my ($refinfo, $creatorinfo) = split(/\0/, $line);
		my ($id, $type, $name, $refid, $reftype, $title) = split(' ', $refinfo, 6);
		my ($creator, $epoch, $tz) =
			($creatorinfo =~ /^(.*) ([0-9]+) (.*)$/);
		$name =~ s!^refs/tags/!!;

		$ref_item{'type'} = $type;
		$ref_item{'id'} = $id;
		$ref_item{'name'} = $name;
		if ($type eq "tag") {
			$ref_item{'subject'} = $title;
			$ref_item{'reftype'} = $reftype;
			$ref_item{'refid'}   = $refid;
		} else {
			$ref_item{'reftype'} = $type;
			$ref_item{'refid'}   = $id;
		}

		if ($type eq "tag" || $type eq "commit") {
			$ref_item{'epoch'} = $epoch;
			if ($epoch) {
				$ref_item{'age'} = age_string(time - $ref_item{'epoch'});
			} else {
				$ref_item{'age'} = "unknown";
			}
		}

		push @tagslist, \%ref_item;
	}
	close $fd;

	return wantarray ? @tagslist : \@tagslist;
}

## ----------------------------------------------------------------------
## filesystem-related functions

sub get_file_owner {
	my $path = shift;

	my ($dev, $ino, $mode, $nlink, $st_uid, $st_gid, $rdev, $size) = stat($path);
	my ($name, $passwd, $uid, $gid, $quota, $comment, $gcos, $dir, $shell) = getpwuid($st_uid);
	if (!defined $gcos) {
		return undef;
	}
	my $owner = $gcos;
	$owner =~ s/[,;].*$//;
	return to_utf8($owner);
}

## ......................................................................
## mimetype related functions

sub mimetype_guess_file {
	my $filename = shift;
	my $mimemap = shift;
	-r $mimemap or return undef;

	my %mimemap;
	open(MIME, $mimemap) or return undef;
	while (<MIME>) {
		next if m/^#/; # skip comments
		my ($mime, $exts) = split(/\t+/);
		if (defined $exts) {
			my @exts = split(/\s+/, $exts);
			foreach my $ext (@exts) {
				$mimemap{$ext} = $mime;
			}
		}
	}
	close(MIME);

	$filename =~ /\.([^.]*)$/;
	return $mimemap{$1};
}

sub mimetype_guess {
	my $filename = shift;
	my $mime;
	$filename =~ /\./ or return undef;

	if ($mimetypes_file) {
		my $file = $mimetypes_file;
		if ($file !~ m!^/!) { # if it is relative path
			# it is relative to project
			$file = "$projectroot/$project/$file";
		}
		$mime = mimetype_guess_file($filename, $file);
	}
	$mime ||= mimetype_guess_file($filename, '/etc/mime.types');
	return $mime;
}

sub blob_mimetype {
	my $fd = shift;
	my $filename = shift;

	if ($filename) {
		my $mime = mimetype_guess($filename);
		$mime and return $mime;
	}

	# just in case
	return $default_blob_plain_mimetype unless $fd;

	if (-T $fd) {
		return 'text/plain' .
		       ($default_text_plain_charset ? '; charset='.$default_text_plain_charset : '');
	} elsif (! $filename) {
		return 'application/octet-stream';
	} elsif ($filename =~ m/\.png$/i) {
		return 'image/png';
	} elsif ($filename =~ m/\.gif$/i) {
		return 'image/gif';
	} elsif ($filename =~ m/\.jpe?g$/i) {
		return 'image/jpeg';
	} else {
		return 'application/octet-stream';
	}
}

## ======================================================================
## functions printing HTML: header, footer, error page

sub git_header_html {
	my $status = shift || "200 OK";
	my $expires = shift;

	my $title = "$site_name";
	if (defined $project) {
		$title .= " - " . to_utf8($project);
		if (defined $action) {
			$title .= "/$action";
			if (defined $file_name) {
				$title .= " - " . esc_path($file_name);
				if ($action eq "tree" && $file_name !~ m|/$|) {
					$title .= "/";
				}
			}
		}
	}
	my $content_type;
	# require explicit support from the UA if we are to send the page as
	# 'application/xhtml+xml', otherwise send it as plain old 'text/html'.
	# we have to do this because MSIE sometimes globs '*/*', pretending to
	# support xhtml+xml but choking when it gets what it asked for.
	if (defined $cgi->http('HTTP_ACCEPT') &&
	    $cgi->http('HTTP_ACCEPT') =~ m/(,|;|\s|^)application\/xhtml\+xml(,|;|\s|$)/ &&
	    $cgi->Accept('application/xhtml+xml') != 0) {
		$content_type = 'application/xhtml+xml';
	} else {
		$content_type = 'text/html';
	}
	print $cgi->header(-type=>$content_type, -charset => 'utf-8',
	                   -status=> $status, -expires => $expires);
	my $mod_perl_version = $ENV{'MOD_PERL'} ? " $ENV{'MOD_PERL'}" : '';
	print <<EOF;
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
<!-- git web interface version $version, (C) 2005-2006, Kay Sievers <kay.sievers\@vrfy.org>, Christian Gierke -->
<!-- git core binaries version $git_version -->
<head>
<meta http-equiv="content-type" content="$content_type; charset=utf-8"/>
<meta name="generator" content="gitweb/$version git/$git_version$mod_perl_version"/>
<meta name="robots" content="index, nofollow"/>
<title>$title</title>
EOF
# print out each stylesheet that exist
	if (defined $stylesheet) {
#provides backwards capability for those people who define style sheet in a config file
		print '<link rel="stylesheet" type="text/css" href="'.$stylesheet.'"/>'."\n";
	} else {
		foreach my $stylesheet (@stylesheets) {
			next unless $stylesheet;
			print '<link rel="stylesheet" type="text/css" href="'.$stylesheet.'"/>'."\n";
		}
	}
	if (defined $project) {
		printf('<link rel="alternate" title="%s log RSS feed" '.
		       'href="%s" type="application/rss+xml" />'."\n",
		       esc_param($project), href(action=>"rss"));
		printf('<link rel="alternate" title="%s log RSS feed (no merges)" '.
		       'href="%s" type="application/rss+xml" />'."\n",
		       esc_param($project), href(action=>"rss",
		                                 extra_options=>"--no-merges"));
		printf('<link rel="alternate" title="%s log Atom feed" '.
		       'href="%s" type="application/atom+xml" />'."\n",
		       esc_param($project), href(action=>"atom"));
		printf('<link rel="alternate" title="%s log Atom feed (no merges)" '.
		       'href="%s" type="application/atom+xml" />'."\n",
		       esc_param($project), href(action=>"atom",
		                                 extra_options=>"--no-merges"));
	} else {
		printf('<link rel="alternate" title="%s projects list" '.
		       'href="%s" type="text/plain; charset=utf-8"/>'."\n",
		       $site_name, href(project=>undef, action=>"project_index"));
		printf('<link rel="alternate" title="%s projects feeds" '.
		       'href="%s" type="text/x-opml"/>'."\n",
		       $site_name, href(project=>undef, action=>"opml"));
	}
	if (defined $favicon) {
		print qq(<link rel="shortcut icon" href="$favicon" type="image/png"/>\n);
	}

	print "</head>\n" .
	      "<body>\n";

	if (-f $site_header) {
		open (my $fd, $site_header);
		print <$fd>;
		close $fd;
	}

	print "<div class=\"page_header\">\n" .
	      $cgi->a({-href => esc_url($logo_url),
	               -title => $logo_label},
	              qq(<img src="$logo" width="72" height="27" alt="git" class="logo"/>));
	print $cgi->a({-href => esc_url($home_link)}, $home_link_str) . " / ";
	if (defined $project) {
		print $cgi->a({-href => href(action=>"summary")}, esc_html($project));
		if (defined $action) {
			print " / $action";
		}
		print "\n";
	}
	print "</div>\n";

	my ($have_search) = gitweb_check_feature('search');
	if ((defined $project) && ($have_search)) {
		if (!defined $searchtext) {
			$searchtext = "";
		}
		my $search_hash;
		if (defined $hash_base) {
			$search_hash = $hash_base;
		} elsif (defined $hash) {
			$search_hash = $hash;
		} else {
			$search_hash = "HEAD";
		}
		my $action = $my_uri;
		my ($use_pathinfo) = gitweb_check_feature('pathinfo');
		if ($use_pathinfo) {
			$action .= "/$project";
		} else {
			$cgi->param("p", $project);
		}
		$cgi->param("a", "search");
		$cgi->param("h", $search_hash);
		print $cgi->startform(-method => "get", -action => $action) .
		      "<div class=\"search\">\n" .
		      (!$use_pathinfo && $cgi->hidden(-name => "p") . "\n") .
		      $cgi->hidden(-name => "a") . "\n" .
		      $cgi->hidden(-name => "h") . "\n" .
		      $cgi->popup_menu(-name => 'st', -default => 'commit',
		                       -values => ['commit', 'grep', 'author', 'committer', 'pickaxe']) .
		      $cgi->sup($cgi->a({-href => href(action=>"search_help")}, "?")) .
		      " search:\n",
		      $cgi->textfield(-name => "s", -value => $searchtext) . "\n" .
		      "</div>" .
		      $cgi->end_form() . "\n";
	}
}

sub git_footer_html {
	print "<div class=\"page_footer\">\n";
	if (defined $project) {
		my $descr = git_get_project_description($project);
		if (defined $descr) {
			print "<div class=\"page_footer_text\">" . esc_html($descr) . "</div>\n";
		}
		print $cgi->a({-href => href(action=>"rss"),
		              -class => "rss_logo"}, "RSS") . " ";
		print $cgi->a({-href => href(action=>"atom"),
		              -class => "rss_logo"}, "Atom") . "\n";
	} else {
		print $cgi->a({-href => href(project=>undef, action=>"opml"),
		              -class => "rss_logo"}, "OPML") . " ";
		print $cgi->a({-href => href(project=>undef, action=>"project_index"),
		              -class => "rss_logo"}, "TXT") . "\n";
	}
	print "</div>\n" ;

	if (-f $site_footer) {
		open (my $fd, $site_footer);
		print <$fd>;
		close $fd;
	}

	print "</body>\n" .
	      "</html>";
}

sub die_error {
	my $status = shift || "403 Forbidden";
	my $error = shift || "Malformed query, file missing or permission denied";

	git_header_html($status);
	print <<EOF;
<div class="page_body">
<br /><br />
$status - $error
<br />
</div>
EOF
	git_footer_html();
	exit;
}

## ----------------------------------------------------------------------
## functions printing or outputting HTML: navigation

sub git_print_page_nav {
	my ($current, $suppress, $head, $treehead, $treebase, $extra) = @_;
	$extra = '' if !defined $extra; # pager or formats

	my @navs = qw(summary shortlog log commit commitdiff tree);
	if ($suppress) {
		@navs = grep { $_ ne $suppress } @navs;
	}

	my %arg = map { $_ => {action=>$_} } @navs;
	if (defined $head) {
		for (qw(commit commitdiff)) {
			$arg{$_}{'hash'} = $head;
		}
		if ($current =~ m/^(tree | log | shortlog | commit | commitdiff | search)$/x) {
			for (qw(shortlog log)) {
				$arg{$_}{'hash'} = $head;
			}
		}
	}
	$arg{'tree'}{'hash'} = $treehead if defined $treehead;
	$arg{'tree'}{'hash_base'} = $treebase if defined $treebase;

	print "<div class=\"page_nav\">\n" .
		(join " | ",
		 map { $_ eq $current ?
		       $_ : $cgi->a({-href => href(%{$arg{$_}})}, "$_")
		 } @navs);
	print "<br/>\n$extra<br/>\n" .
	      "</div>\n";
}

sub format_paging_nav {
	my ($action, $hash, $head, $page, $nrevs) = @_;
	my $paging_nav;


	if ($hash ne $head || $page) {
		$paging_nav .= $cgi->a({-href => href(action=>$action)}, "HEAD");
	} else {
		$paging_nav .= "HEAD";
	}

	if ($page > 0) {
		$paging_nav .= " &sdot; " .
			$cgi->a({-href => href(action=>$action, hash=>$hash, page=>$page-1),
			         -accesskey => "p", -title => "Alt-p"}, "prev");
	} else {
		$paging_nav .= " &sdot; prev";
	}

	if ($nrevs >= (100 * ($page+1)-1)) {
		$paging_nav .= " &sdot; " .
			$cgi->a({-href => href(action=>$action, hash=>$hash, page=>$page+1),
			         -accesskey => "n", -title => "Alt-n"}, "next");
	} else {
		$paging_nav .= " &sdot; next";
	}

	return $paging_nav;
}

## ......................................................................
## functions printing or outputting HTML: div

sub git_print_header_div {
	my ($action, $title, $hash, $hash_base) = @_;
	my %args = ();

	$args{'action'} = $action;
	$args{'hash'} = $hash if $hash;
	$args{'hash_base'} = $hash_base if $hash_base;

	print "<div class=\"header\">\n" .
	      $cgi->a({-href => href(%args), -class => "title"},
	      $title ? $title : $action) .
	      "\n</div>\n";
}

#sub git_print_authorship (\%) {
sub git_print_authorship {
	my $co = shift;

	my %ad = parse_date($co->{'author_epoch'}, $co->{'author_tz'});
	print "<div class=\"author_date\">" .
	      esc_html($co->{'author_name'}) .
	      " [$ad{'rfc2822'}";
	if ($ad{'hour_local'} < 6) {
		printf(" (<span class=\"atnight\">%02d:%02d</span> %s)",
		       $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'});
	} else {
		printf(" (%02d:%02d %s)",
		       $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'});
	}
	print "]</div>\n";
}

sub git_print_page_path {
	my $name = shift;
	my $type = shift;
	my $hb = shift;


	print "<div class=\"page_path\">";
	print $cgi->a({-href => href(action=>"tree", hash_base=>$hb),
	              -title => 'tree root'}, to_utf8("[$project]"));
	print " / ";
	if (defined $name) {
		my @dirname = split '/', $name;
		my $basename = pop @dirname;
		my $fullname = '';

		foreach my $dir (@dirname) {
			$fullname .= ($fullname ? '/' : '') . $dir;
			print $cgi->a({-href => href(action=>"tree", file_name=>$fullname,
			                             hash_base=>$hb),
			              -title => $fullname}, esc_path($dir));
			print " / ";
		}
		if (defined $type && $type eq 'blob') {
			print $cgi->a({-href => href(action=>"blob_plain", file_name=>$file_name,
			                             hash_base=>$hb),
			              -title => $name}, esc_path($basename));
		} elsif (defined $type && $type eq 'tree') {
			print $cgi->a({-href => href(action=>"tree", file_name=>$file_name,
			                             hash_base=>$hb),
			              -title => $name}, esc_path($basename));
			print " / ";
		} else {
			print esc_path($basename);
		}
	}
	print "<br/></div>\n";
}

# sub git_print_log (\@;%) {
sub git_print_log ($;%) {
	my $log = shift;
	my %opts = @_;

	if ($opts{'-remove_title'}) {
		# remove title, i.e. first line of log
		shift @$log;
	}
	# remove leading empty lines
	while (defined $log->[0] && $log->[0] eq "") {
		shift @$log;
	}

	# print log
	my $signoff = 0;
	my $empty = 0;
	foreach my $line (@$log) {
		if ($line =~ m/^ *(signed[ \-]off[ \-]by[ :]|acked[ \-]by[ :]|cc[ :])/i) {
			$signoff = 1;
			$empty = 0;
			if (! $opts{'-remove_signoff'}) {
				print "<span class=\"signoff\">" . esc_html($line) . "</span><br/>\n";
				next;
			} else {
				# remove signoff lines
				next;
			}
		} else {
			$signoff = 0;
		}

		# print only one empty line
		# do not print empty line after signoff
		if ($line eq "") {
			next if ($empty || $signoff);
			$empty = 1;
		} else {
			$empty = 0;
		}

		print format_log_line_html($line) . "<br/>\n";
	}

	if ($opts{'-final_empty_line'}) {
		# end with single empty line
		print "<br/>\n" unless $empty;
	}
}

# return link target (what link points to)
sub git_get_link_target {
	my $hash = shift;
	my $link_target;

	# read link
	open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
		or return;
	{
		local $/;
		$link_target = <$fd>;
	}
	close $fd
		or return;

	return $link_target;
}

# given link target, and the directory (basedir) the link is in,
# return target of link relative to top directory (top tree);
# return undef if it is not possible (including absolute links).
sub normalize_link_target {
	my ($link_target, $basedir, $hash_base) = @_;

	# we can normalize symlink target only if $hash_base is provided
	return unless $hash_base;

	# absolute symlinks (beginning with '/') cannot be normalized
	return if (substr($link_target, 0, 1) eq '/');

	# normalize link target to path from top (root) tree (dir)
	my $path;
	if ($basedir) {
		$path = $basedir . '/' . $link_target;
	} else {
		# we are in top (root) tree (dir)
		$path = $link_target;
	}

	# remove //, /./, and /../
	my @path_parts;
	foreach my $part (split('/', $path)) {
		# discard '.' and ''
		next if (!$part || $part eq '.');
		# handle '..'
		if ($part eq '..') {
			if (@path_parts) {
				pop @path_parts;
			} else {
				# link leads outside repository (outside top dir)
				return;
			}
		} else {
			push @path_parts, $part;
		}
	}
	$path = join('/', @path_parts);

	return $path;
}

# print tree entry (row of git_tree), but without encompassing <tr> element
sub git_print_tree_entry {
	my ($t, $basedir, $hash_base, $have_blame) = @_;

	my %base_key = ();
	$base_key{'hash_base'} = $hash_base if defined $hash_base;

	# The format of a table row is: mode list link.  Where mode is
	# the mode of the entry, list is the name of the entry, an href,
	# and link is the action links of the entry.

	print "<td class=\"mode\">" . mode_str($t->{'mode'}) . "</td>\n";
	if ($t->{'type'} eq "blob") {
		print "<td class=\"list\">" .
			$cgi->a({-href => href(action=>"blob", hash=>$t->{'hash'},
			                       file_name=>"$basedir$t->{'name'}", %base_key),
			        -class => "list"}, esc_path($t->{'name'}));
		if (S_ISLNK(oct $t->{'mode'})) {
			my $link_target = git_get_link_target($t->{'hash'});
			if ($link_target) {
				my $norm_target = normalize_link_target($link_target, $basedir, $hash_base);
				if (defined $norm_target) {
					print " -> " .
					      $cgi->a({-href => href(action=>"object", hash_base=>$hash_base,
					                             file_name=>$norm_target),
					               -title => $norm_target}, esc_path($link_target));
				} else {
					print " -> " . esc_path($link_target);
				}
			}
		}
		print "</td>\n";
		print "<td class=\"link\">";
		print $cgi->a({-href => href(action=>"blob", hash=>$t->{'hash'},
		                             file_name=>"$basedir$t->{'name'}", %base_key)},
		              "blob");
		if ($have_blame) {
			print " | " .
			      $cgi->a({-href => href(action=>"blame", hash=>$t->{'hash'},
			                             file_name=>"$basedir$t->{'name'}", %base_key)},
			              "blame");
		}
		if (defined $hash_base) {
			print " | " .
			      $cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
			                             hash=>$t->{'hash'}, file_name=>"$basedir$t->{'name'}")},
			              "history");
		}
		print " | " .
			$cgi->a({-href => href(action=>"blob_plain", hash_base=>$hash_base,
			                       file_name=>"$basedir$t->{'name'}")},
			        "raw");
		print "</td>\n";

	} elsif ($t->{'type'} eq "tree") {
		print "<td class=\"list\">";
		print $cgi->a({-href => href(action=>"tree", hash=>$t->{'hash'},
		                             file_name=>"$basedir$t->{'name'}", %base_key)},
		              esc_path($t->{'name'}));
		print "</td>\n";
		print "<td class=\"link\">";
		print $cgi->a({-href => href(action=>"tree", hash=>$t->{'hash'},
		                             file_name=>"$basedir$t->{'name'}", %base_key)},
		              "tree");
		if (defined $hash_base) {
			print " | " .
			      $cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
			                             file_name=>"$basedir$t->{'name'}")},
			              "history");
		}
		print "</td>\n";
	} else {
		# unknown object: we can only present history for it
		# (this includes 'commit' object, i.e. submodule support)
		print "<td class=\"list\">" .
		      esc_path($t->{'name'}) .
		      "</td>\n";
		print "<td class=\"link\">";
		if (defined $hash_base) {
			print $cgi->a({-href => href(action=>"history",
			                             hash_base=>$hash_base,
			                             file_name=>"$basedir$t->{'name'}")},
			              "history");
		}
		print "</td>\n";
	}
}

## ......................................................................
## functions printing large fragments of HTML

sub fill_from_file_info {
	my ($diff, @parents) = @_;

	$diff->{'from_file'} = [ ];
	$diff->{'from_file'}[$diff->{'nparents'} - 1] = undef;
	for (my $i = 0; $i < $diff->{'nparents'}; $i++) {
		if ($diff->{'status'}[$i] eq 'R' ||
		    $diff->{'status'}[$i] eq 'C') {
			$diff->{'from_file'}[$i] =
				git_get_path_by_hash($parents[$i], $diff->{'from_id'}[$i]);
		}
	}

	return $diff;
}

# parameters can be strings, or references to arrays of strings
sub from_ids_eq {
	my ($a, $b) = @_;

	if (ref($a) eq "ARRAY" && ref($b) eq "ARRAY" && @$a == @$b) {
		for (my $i = 0; $i < @$a; ++$i) {
			return 0 unless ($a->[$i] eq $b->[$i]);
		}
		return 1;
	} elsif (!ref($a) && !ref($b)) {
		return $a eq $b;
	} else {
		return 0;
	}
}

sub is_deleted {
	my $diffinfo = shift;

	return $diffinfo->{'to_id'} eq ('0' x 40);
}

sub git_difftree_body {
	my ($difftree, $hash, @parents) = @_;
	my ($parent) = $parents[0];
	my ($have_blame) = gitweb_check_feature('blame');
	print "<div class=\"list_head\">\n";
	if ($#{$difftree} > 10) {
		print(($#{$difftree} + 1) . " files changed:\n");
	}
	print "</div>\n";

	print "<table class=\"" .
	      (@parents > 1 ? "combined " : "") .
	      "diff_tree\">\n";

	# header only for combined diff in 'commitdiff' view
	my $has_header = @parents > 1 && $action eq 'commitdiff';
	if ($has_header) {
		# table header
		print "<thead><tr>\n" .
		       "<th></th><th></th>\n"; # filename, patchN link
		for (my $i = 0; $i < @parents; $i++) {
			my $par = $parents[$i];
			print "<th>" .
			      $cgi->a({-href => href(action=>"commitdiff",
			                             hash=>$hash, hash_parent=>$par),
			               -title => 'commitdiff to parent number ' .
			                          ($i+1) . ': ' . substr($par,0,7)},
			              $i+1) .
			      "&nbsp;</th>\n";
		}
		print "</tr></thead>\n<tbody>\n";
	}

	my $alternate = 1;
	my $patchno = 0;
	foreach my $line (@{$difftree}) {
		my $diff;
		if (ref($line) eq "HASH") {
			# pre-parsed (or generated by hand)
			$diff = $line;
		} else {
			$diff = parse_difftree_raw_line($line);
		}

		if ($alternate) {
			print "<tr class=\"dark\">\n";
		} else {
			print "<tr class=\"light\">\n";
		}
		$alternate ^= 1;

		if (exists $diff->{'nparents'}) { # combined diff

			fill_from_file_info($diff, @parents)
				unless exists $diff->{'from_file'};

			if (!is_deleted($diff)) {
				# file exists in the result (child) commit
				print "<td>" .
				      $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
				                             file_name=>$diff->{'to_file'},
				                             hash_base=>$hash),
				              -class => "list"}, esc_path($diff->{'to_file'})) .
				      "</td>\n";
			} else {
				print "<td>" .
				      esc_path($diff->{'to_file'}) .
				      "</td>\n";
			}

			if ($action eq 'commitdiff') {
				# link to patch
				$patchno++;
				print "<td class=\"link\">" .
				      $cgi->a({-href => "#patch$patchno"}, "patch") .
				      " | " .
				      "</td>\n";
			}

			my $has_history = 0;
			my $not_deleted = 0;
			for (my $i = 0; $i < $diff->{'nparents'}; $i++) {
				my $hash_parent = $parents[$i];
				my $from_hash = $diff->{'from_id'}[$i];
				my $from_path = $diff->{'from_file'}[$i];
				my $status = $diff->{'status'}[$i];

				$has_history ||= ($status ne 'A');
				$not_deleted ||= ($status ne 'D');

				if ($status eq 'A') {
					print "<td  class=\"link\" align=\"right\"> | </td>\n";
				} elsif ($status eq 'D') {
					print "<td class=\"link\">" .
					      $cgi->a({-href => href(action=>"blob",
					                             hash_base=>$hash,
					                             hash=>$from_hash,
					                             file_name=>$from_path)},
					              "blob" . ($i+1)) .
					      " | </td>\n";
				} else {
					if ($diff->{'to_id'} eq $from_hash) {
						print "<td class=\"link nochange\">";
					} else {
						print "<td class=\"link\">";
					}
					print $cgi->a({-href => href(action=>"blobdiff",
					                             hash=>$diff->{'to_id'},
					                             hash_parent=>$from_hash,
					                             hash_base=>$hash,
					                             hash_parent_base=>$hash_parent,
					                             file_name=>$diff->{'to_file'},
					                             file_parent=>$from_path)},
					              "diff" . ($i+1)) .
					      " | </td>\n";
				}
			}

			print "<td class=\"link\">";
			if ($not_deleted) {
				print $cgi->a({-href => href(action=>"blob",
				                             hash=>$diff->{'to_id'},
				                             file_name=>$diff->{'to_file'},
				                             hash_base=>$hash)},
				              "blob");
				print " | " if ($has_history);
			}
			if ($has_history) {
				print $cgi->a({-href => href(action=>"history",
				                             file_name=>$diff->{'to_file'},
				                             hash_base=>$hash)},
				              "history");
			}
			print "</td>\n";

			print "</tr>\n";
			next; # instead of 'else' clause, to avoid extra indent
		}
		# else ordinary diff

		my ($to_mode_oct, $to_mode_str, $to_file_type);
		my ($from_mode_oct, $from_mode_str, $from_file_type);
		if ($diff->{'to_mode'} ne ('0' x 6)) {
			$to_mode_oct = oct $diff->{'to_mode'};
			if (S_ISREG($to_mode_oct)) { # only for regular file
				$to_mode_str = sprintf("%04o", $to_mode_oct & 0777); # permission bits
			}
			$to_file_type = file_type($diff->{'to_mode'});
		}
		if ($diff->{'from_mode'} ne ('0' x 6)) {
			$from_mode_oct = oct $diff->{'from_mode'};
			if (S_ISREG($to_mode_oct)) { # only for regular file
				$from_mode_str = sprintf("%04o", $from_mode_oct & 0777); # permission bits
			}
			$from_file_type = file_type($diff->{'from_mode'});
		}

		if ($diff->{'status'} eq "A") { # created
			my $mode_chng = "<span class=\"file_status new\">[new $to_file_type";
			$mode_chng   .= " with mode: $to_mode_str" if $to_mode_str;
			$mode_chng   .= "]</span>";
			print "<td>";
			print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
			                             hash_base=>$hash, file_name=>$diff->{'file'}),
			              -class => "list"}, esc_path($diff->{'file'}));
			print "</td>\n";
			print "<td>$mode_chng</td>\n";
			print "<td class=\"link\">";
			if ($action eq 'commitdiff') {
				# link to patch
				$patchno++;
				print $cgi->a({-href => "#patch$patchno"}, "patch");
				print " | ";
			}
			print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
			                             hash_base=>$hash, file_name=>$diff->{'file'})},
			              "blob");
			print "</td>\n";

		} elsif ($diff->{'status'} eq "D") { # deleted
			my $mode_chng = "<span class=\"file_status deleted\">[deleted $from_file_type]</span>";
			print "<td>";
			print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'from_id'},
			                             hash_base=>$parent, file_name=>$diff->{'file'}),
			               -class => "list"}, esc_path($diff->{'file'}));
			print "</td>\n";
			print "<td>$mode_chng</td>\n";
			print "<td class=\"link\">";
			if ($action eq 'commitdiff') {
				# link to patch
				$patchno++;
				print $cgi->a({-href => "#patch$patchno"}, "patch");
				print " | ";
			}
			print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'from_id'},
			                             hash_base=>$parent, file_name=>$diff->{'file'})},
			              "blob") . " | ";
			if ($have_blame) {
				print $cgi->a({-href => href(action=>"blame", hash_base=>$parent,
				                             file_name=>$diff->{'file'})},
				              "blame") . " | ";
			}
			print $cgi->a({-href => href(action=>"history", hash_base=>$parent,
			                             file_name=>$diff->{'file'})},
			              "history");
			print "</td>\n";

		} elsif ($diff->{'status'} eq "M" || $diff->{'status'} eq "T") { # modified, or type changed
			my $mode_chnge = "";
			if ($diff->{'from_mode'} != $diff->{'to_mode'}) {
				$mode_chnge = "<span class=\"file_status mode_chnge\">[changed";
				if ($from_file_type ne $to_file_type) {
					$mode_chnge .= " from $from_file_type to $to_file_type";
				}
				if (($from_mode_oct & 0777) != ($to_mode_oct & 0777)) {
					if ($from_mode_str && $to_mode_str) {
						$mode_chnge .= " mode: $from_mode_str->$to_mode_str";
					} elsif ($to_mode_str) {
						$mode_chnge .= " mode: $to_mode_str";
					}
				}
				$mode_chnge .= "]</span>\n";
			}
			print "<td>";
			print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
			                             hash_base=>$hash, file_name=>$diff->{'file'}),
			              -class => "list"}, esc_path($diff->{'file'}));
			print "</td>\n";
			print "<td>$mode_chnge</td>\n";
			print "<td class=\"link\">";
			if ($action eq 'commitdiff') {
				# link to patch
				$patchno++;
				print $cgi->a({-href => "#patch$patchno"}, "patch") .
				      " | ";
			} elsif ($diff->{'to_id'} ne $diff->{'from_id'}) {
				# "commit" view and modified file (not onlu mode changed)
				print $cgi->a({-href => href(action=>"blobdiff",
				                             hash=>$diff->{'to_id'}, hash_parent=>$diff->{'from_id'},
				                             hash_base=>$hash, hash_parent_base=>$parent,
				                             file_name=>$diff->{'file'})},
				              "diff") .
				      " | ";
			}
			print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
			                             hash_base=>$hash, file_name=>$diff->{'file'})},
			               "blob") . " | ";
			if ($have_blame) {
				print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
				                             file_name=>$diff->{'file'})},
				              "blame") . " | ";
			}
			print $cgi->a({-href => href(action=>"history", hash_base=>$hash,
			                             file_name=>$diff->{'file'})},
			              "history");
			print "</td>\n";

		} elsif ($diff->{'status'} eq "R" || $diff->{'status'} eq "C") { # renamed or copied
			my %status_name = ('R' => 'moved', 'C' => 'copied');
			my $nstatus = $status_name{$diff->{'status'}};
			my $mode_chng = "";
			if ($diff->{'from_mode'} != $diff->{'to_mode'}) {
				# mode also for directories, so we cannot use $to_mode_str
				$mode_chng = sprintf(", mode: %04o", $to_mode_oct & 0777);
			}
			print "<td>" .
			      $cgi->a({-href => href(action=>"blob", hash_base=>$hash,
			                             hash=>$diff->{'to_id'}, file_name=>$diff->{'to_file'}),
			              -class => "list"}, esc_path($diff->{'to_file'})) . "</td>\n" .
			      "<td><span class=\"file_status $nstatus\">[$nstatus from " .
			      $cgi->a({-href => href(action=>"blob", hash_base=>$parent,
			                             hash=>$diff->{'from_id'}, file_name=>$diff->{'from_file'}),
			              -class => "list"}, esc_path($diff->{'from_file'})) .
			      " with " . (int $diff->{'similarity'}) . "% similarity$mode_chng]</span></td>\n" .
			      "<td class=\"link\">";
			if ($action eq 'commitdiff') {
				# link to patch
				$patchno++;
				print $cgi->a({-href => "#patch$patchno"}, "patch") .
				      " | ";
			} elsif ($diff->{'to_id'} ne $diff->{'from_id'}) {
				# "commit" view and modified file (not only pure rename or copy)
				print $cgi->a({-href => href(action=>"blobdiff",
				                             hash=>$diff->{'to_id'}, hash_parent=>$diff->{'from_id'},
				                             hash_base=>$hash, hash_parent_base=>$parent,
				                             file_name=>$diff->{'to_file'}, file_parent=>$diff->{'from_file'})},
				              "diff") .
				      " | ";
			}
			print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
			                             hash_base=>$parent, file_name=>$diff->{'to_file'})},
			              "blob") . " | ";
			if ($have_blame) {
				print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
				                             file_name=>$diff->{'to_file'})},
				              "blame") . " | ";
			}
			print $cgi->a({-href => href(action=>"history", hash_base=>$hash,
			                            file_name=>$diff->{'to_file'})},
			              "history");
			print "</td>\n";

		} # we should not encounter Unmerged (U) or Unknown (X) status
		print "</tr>\n";
	}
	print "</tbody>" if $has_header;
	print "</table>\n";
}

sub git_patchset_body {
	my ($fd, $difftree, $hash, @hash_parents) = @_;
	my ($hash_parent) = $hash_parents[0];

	my $patch_idx = 0;
	my $patch_number = 0;
	my $patch_line;
	my $diffinfo;
	my (%from, %to);

	print "<div class=\"patchset\">\n";

	# skip to first patch
	while ($patch_line = <$fd>) {
		chomp $patch_line;

		last if ($patch_line =~ m/^diff /);
	}

 PATCH:
	while ($patch_line) {
		my @diff_header;
		my ($from_id, $to_id);

		# git diff header
		#assert($patch_line =~ m/^diff /) if DEBUG;
		#assert($patch_line !~ m!$/$!) if DEBUG; # is chomp-ed
		$patch_number++;
		push @diff_header, $patch_line;

		# extended diff header
	EXTENDED_HEADER:
		while ($patch_line = <$fd>) {
			chomp $patch_line;

			last EXTENDED_HEADER if ($patch_line =~ m/^--- |^diff /);

			if ($patch_line =~ m/^index ([0-9a-fA-F]{40})..([0-9a-fA-F]{40})/) {
				$from_id = $1;
				$to_id   = $2;
			} elsif ($patch_line =~ m/^index ((?:[0-9a-fA-F]{40},)+[0-9a-fA-F]{40})..([0-9a-fA-F]{40})/) {
				$from_id = [ split(',', $1) ];
				$to_id   = $2;
			}

			push @diff_header, $patch_line;
		}
		my $last_patch_line = $patch_line;

		# check if current patch belong to current raw line
		# and parse raw git-diff line if needed
		if (defined $diffinfo &&
		    defined $from_id && defined $to_id &&
		    from_ids_eq($diffinfo->{'from_id'}, $from_id) &&
		    $diffinfo->{'to_id'} eq $to_id) {
			# this is continuation of a split patch
			print "<div class=\"patch cont\">\n";
		} else {
			# advance raw git-diff output if needed
			$patch_idx++ if defined $diffinfo;

			# compact combined diff output can have some patches skipped
			# find which patch (using pathname of result) we are at now
			my $to_name;
			if ($diff_header[0] =~ m!^diff --cc "?(.*)"?$!) {
				$to_name = $1;
			}

			do {
				# read and prepare patch information
				if (ref($difftree->[$patch_idx]) eq "HASH") {
					# pre-parsed (or generated by hand)
					$diffinfo = $difftree->[$patch_idx];
				} else {
					$diffinfo = parse_difftree_raw_line($difftree->[$patch_idx]);
				}

				# check if current raw line has no patch (it got simplified)
				if (defined $to_name && $to_name ne $diffinfo->{'to_file'}) {
					print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n" .
					      format_diff_cc_simplified($diffinfo, @hash_parents) .
					      "</div>\n";  # class="patch"

					$patch_idx++;
					$patch_number++;
				}
			} until (!defined $to_name || $to_name eq $diffinfo->{'to_file'} ||
			         $patch_idx > $#$difftree);
			# modifies %from, %to hashes
			parse_from_to_diffinfo($diffinfo, \%from, \%to, @hash_parents);
			if ($diffinfo->{'nparents'}) {
				# combined diff
				$from{'file'} = [];
				$from{'href'} = [];
				fill_from_file_info($diffinfo, @hash_parents)
					unless exists $diffinfo->{'from_file'};
				for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
					$from{'file'}[$i] = $diffinfo->{'from_file'}[$i] || $diffinfo->{'to_file'};
					if ($diffinfo->{'status'}[$i] ne "A") { # not new (added) file
						$from{'href'}[$i] = href(action=>"blob",
						                         hash_base=>$hash_parents[$i],
						                         hash=>$diffinfo->{'from_id'}[$i],
						                         file_name=>$from{'file'}[$i]);
					} else {
						$from{'href'}[$i] = undef;
					}
				}
			} else {
				$from{'file'} = $diffinfo->{'from_file'} || $diffinfo->{'file'};
				if ($diffinfo->{'status'} ne "A") { # not new (added) file
					$from{'href'} = href(action=>"blob", hash_base=>$hash_parent,
					                     hash=>$diffinfo->{'from_id'},
					                     file_name=>$from{'file'});
				} else {
					delete $from{'href'};
				}
			}

			$to{'file'} = $diffinfo->{'to_file'} || $diffinfo->{'file'};
			if (!is_deleted($diffinfo)) { # file exists in result
				$to{'href'} = href(action=>"blob", hash_base=>$hash,
				                   hash=>$diffinfo->{'to_id'},
				                   file_name=>$to{'file'});
			} else {
				delete $to{'href'};
			}
			# this is first patch for raw difftree line with $patch_idx index
			# we index @$difftree array from 0, but number patches from 1
			print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n";
		}

		# print "git diff" header
		$patch_line = shift @diff_header;
		print format_git_diff_header_line($patch_line, $diffinfo,
		                                  \%from, \%to);

		# print extended diff header
		print "<div class=\"diff extended_header\">\n" if (@diff_header > 0);
	EXTENDED_HEADER:
		foreach $patch_line (@diff_header) {
			print format_extended_diff_header_line($patch_line, $diffinfo,
			                                       \%from, \%to);
		}
		print "</div>\n"  if (@diff_header > 0); # class="diff extended_header"

		# from-file/to-file diff header
		$patch_line = $last_patch_line;
		if (! $patch_line) {
			print "</div>\n"; # class="patch"
			last PATCH;
		}
		next PATCH if ($patch_line =~ m/^diff /);
		#assert($patch_line =~ m/^---/) if DEBUG;
		#assert($patch_line eq $last_patch_line) if DEBUG;

		$patch_line = <$fd>;
		chomp $patch_line;
		#assert($patch_line =~ m/^\+\+\+/) if DEBUG;

		print format_diff_from_to_header($last_patch_line, $patch_line,
		                                 $diffinfo, \%from, \%to,
		                                 @hash_parents);

		# the patch itself
	LINE:
		while ($patch_line = <$fd>) {
			chomp $patch_line;

			next PATCH if ($patch_line =~ m/^diff /);

			print format_diff_line($patch_line, \%from, \%to);
		}

	} continue {
		print "</div>\n"; # class="patch"
	}

	# for compact combined (--cc) format, with chunk and patch simpliciaction
	# patchset might be empty, but there might be unprocessed raw lines
	for ($patch_idx++ if $patch_number > 0;
	     $patch_idx < @$difftree;
	     $patch_idx++) {
		# read and prepare patch information
		if (ref($difftree->[$patch_idx]) eq "HASH") {
			# pre-parsed (or generated by hand)
			$diffinfo = $difftree->[$patch_idx];
		} else {
			$diffinfo = parse_difftree_raw_line($difftree->[$patch_idx]);
		}

		# generate anchor for "patch" links in difftree / whatchanged part
		print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n" .
		      format_diff_cc_simplified($diffinfo, @hash_parents) .
		      "</div>\n";  # class="patch"

		$patch_number++;
	}

	if ($patch_number == 0) {
		if (@hash_parents > 1) {
			print "<div class=\"diff nodifferences\">Trivial merge</div>\n";
		} else {
			print "<div class=\"diff nodifferences\">No differences found</div>\n";
		}
	}

	print "</div>\n"; # class="patchset"
}

# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

sub git_project_list_body {
	my ($projlist, $order, $from, $to, $extra, $no_header) = @_;

	my ($check_forks) = gitweb_check_feature('forks');

	my @projects;
	foreach my $pr (@$projlist) {
		my (@aa) = git_get_last_activity($pr->{'path'});
		unless (@aa) {
			next;
		}
		($pr->{'age'}, $pr->{'age_string'}) = @aa;
		if (!defined $pr->{'descr'}) {
			my $descr = git_get_project_description($pr->{'path'}) || "";
			$pr->{'descr_long'} = to_utf8($descr);
			$pr->{'descr'} = chop_str($descr, $projects_list_description_width, 5);
		}
		if (!defined $pr->{'owner'}) {
			$pr->{'owner'} = git_get_project_owner("$pr->{'path'}") || "";
		}
		if ($check_forks) {
			my $pname = $pr->{'path'};
			if (($pname =~ s/\.git$//) &&
			    ($pname !~ /\/$/) &&
			    (-d "$projectroot/$pname")) {
				$pr->{'forks'} = "-d $projectroot/$pname";
			}
			else {
				$pr->{'forks'} = 0;
			}
		}
		push @projects, $pr;
	}

	$order ||= $default_projects_order;
	$from = 0 unless defined $from;
	$to = $#projects if (!defined $to || $#projects < $to);

	print "<table class=\"project_list\">\n";
	unless ($no_header) {
		print "<tr>\n";
		if ($check_forks) {
			print "<th></th>\n";
		}
		if ($order eq "project") {
			@projects = sort {$a->{'path'} cmp $b->{'path'}} @projects;
			print "<th>Project</th>\n";
		} else {
			print "<th>" .
			      $cgi->a({-href => href(project=>undef, order=>'project'),
			               -class => "header"}, "Project") .
			      "</th>\n";
		}
		if ($order eq "descr") {
			@projects = sort {$a->{'descr'} cmp $b->{'descr'}} @projects;
			print "<th>Description</th>\n";
		} else {
			print "<th>" .
			      $cgi->a({-href => href(project=>undef, order=>'descr'),
			               -class => "header"}, "Description") .
			      "</th>\n";
		}
		if ($order eq "owner") {
			@projects = sort {$a->{'owner'} cmp $b->{'owner'}} @projects;
			print "<th>Owner</th>\n";
		} else {
			print "<th>" .
			      $cgi->a({-href => href(project=>undef, order=>'owner'),
			               -class => "header"}, "Owner") .
			      "</th>\n";
		}
		if ($order eq "age") {
			@projects = sort {$a->{'age'} <=> $b->{'age'}} @projects;
			print "<th>Last Change</th>\n";
		} else {
			print "<th>" .
			      $cgi->a({-href => href(project=>undef, order=>'age'),
			               -class => "header"}, "Last Change") .
			      "</th>\n";
		}
		print "<th></th>\n" .
		      "</tr>\n";
	}
	my $alternate = 1;
	for (my $i = $from; $i <= $to; $i++) {
		my $pr = $projects[$i];
		if ($alternate) {
			print "<tr class=\"dark\">\n";
		} else {
			print "<tr class=\"light\">\n";
		}
		$alternate ^= 1;
		if ($check_forks) {
			print "<td>";
			if ($pr->{'forks'}) {
				print "<!-- $pr->{'forks'} -->\n";
				print $cgi->a({-href => href(project=>$pr->{'path'}, action=>"forks")}, "+");
			}
			print "</td>\n";
		}
		print "<td>" . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary"),
		                        -class => "list"}, esc_html($pr->{'path'})) . "</td>\n" .
		      "<td>" . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary"),
		                        -class => "list", -title => $pr->{'descr_long'}},
		                        esc_html($pr->{'descr'})) . "</td>\n" .
		      "<td><i>" . esc_html(chop_str($pr->{'owner'}, 15)) . "</i></td>\n";
		print "<td class=\"". age_class($pr->{'age'}) . "\">" .
		      (defined $pr->{'age_string'} ? $pr->{'age_string'} : "No commits") . "</td>\n" .
		      "<td class=\"link\">" .
		      $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary")}, "summary")   . " | " .
		      $cgi->a({-href => href(project=>$pr->{'path'}, action=>"shortlog")}, "shortlog") . " | " .
		      $cgi->a({-href => href(project=>$pr->{'path'}, action=>"log")}, "log") . " | " .
		      $cgi->a({-href => href(project=>$pr->{'path'}, action=>"tree")}, "tree") .
		      ($pr->{'forks'} ? " | " . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"forks")}, "forks") : '') .
		      "</td>\n" .
		      "</tr>\n";
	}
	if (defined $extra) {
		print "<tr>\n";
		if ($check_forks) {
			print "<td></td>\n";
		}
		print "<td colspan=\"5\">$extra</td>\n" .
		      "</tr>\n";
	}
	print "</table>\n";
}

sub git_shortlog_body {
	# uses global variable $project
	my ($commitlist, $from, $to, $refs, $extra) = @_;

	$from = 0 unless defined $from;
	$to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);

	print "<table class=\"shortlog\" cellspacing=\"0\">\n";
	my $alternate = 1;
	for (my $i = $from; $i <= $to; $i++) {
		my %co = %{$commitlist->[$i]};
		my $commit = $co{'id'};
		my $ref = format_ref_marker($refs, $commit);
		if ($alternate) {
			print "<tr class=\"dark\">\n";
		} else {
			print "<tr class=\"light\">\n";
		}
		$alternate ^= 1;
		# git_summary() used print "<td><i>$co{'age_string'}</i></td>\n" .
		print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
		      "<td><i>" . esc_html(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
		      "<td>";
		print format_subject_html($co{'title'}, $co{'title_short'},
		                          href(action=>"commit", hash=>$commit), $ref);
		print "</td>\n" .
		      "<td class=\"link\">" .
		      $cgi->a({-href => href(action=>"commit", hash=>$commit)}, "commit") . " | " .
		      $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff") . " | " .
		      $cgi->a({-href => href(action=>"tree", hash=>$commit, hash_base=>$commit)}, "tree");
		my $snapshot_links = format_snapshot_links($commit);
		if (defined $snapshot_links) {
			print " | " . $snapshot_links;
		}
		print "</td>\n" .
		      "</tr>\n";
	}
	if (defined $extra) {
		print "<tr>\n" .
		      "<td colspan=\"4\">$extra</td>\n" .
		      "</tr>\n";
	}
	print "</table>\n";
}

sub git_history_body {
	# Warning: assumes constant type (blob or tree) during history
	my ($commitlist, $from, $to, $refs, $hash_base, $ftype, $extra) = @_;

	$from = 0 unless defined $from;
	$to = $#{$commitlist} unless (defined $to && $to <= $#{$commitlist});

	print "<table class=\"history\" cellspacing=\"0\">\n";
	my $alternate = 1;
	for (my $i = $from; $i <= $to; $i++) {
		my %co = %{$commitlist->[$i]};
		if (!%co) {
			next;
		}
		my $commit = $co{'id'};

		my $ref = format_ref_marker($refs, $commit);

		if ($alternate) {
			print "<tr class=\"dark\">\n";
		} else {
			print "<tr class=\"light\">\n";
		}
		$alternate ^= 1;
		print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
		      # shortlog uses      chop_str($co{'author_name'}, 10)
		      "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 3)) . "</i></td>\n" .
		      "<td>";
		# originally git_history used chop_str($co{'title'}, 50)
		print format_subject_html($co{'title'}, $co{'title_short'},
		                          href(action=>"commit", hash=>$commit), $ref);
		print "</td>\n" .
		      "<td class=\"link\">" .
		      $cgi->a({-href => href(action=>$ftype, hash_base=>$commit, file_name=>$file_name)}, $ftype) . " | " .
		      $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff");

		if ($ftype eq 'blob') {
			my $blob_current = git_get_hash_by_path($hash_base, $file_name);
			my $blob_parent  = git_get_hash_by_path($commit, $file_name);
			if (defined $blob_current && defined $blob_parent &&
					$blob_current ne $blob_parent) {
				print " | " .
					$cgi->a({-href => href(action=>"blobdiff",
					                       hash=>$blob_current, hash_parent=>$blob_parent,
					                       hash_base=>$hash_base, hash_parent_base=>$commit,
					                       file_name=>$file_name)},
					        "diff to current");
			}
		}
		print "</td>\n" .
		      "</tr>\n";
	}
	if (defined $extra) {
		print "<tr>\n" .
		      "<td colspan=\"4\">$extra</td>\n" .
		      "</tr>\n";
	}
	print "</table>\n";
}

sub git_tags_body {
	# uses global variable $project
	my ($taglist, $from, $to, $extra) = @_;
	$from = 0 unless defined $from;
	$to = $#{$taglist} if (!defined $to || $#{$taglist} < $to);

	print "<table class=\"tags\" cellspacing=\"0\">\n";
	my $alternate = 1;
	for (my $i = $from; $i <= $to; $i++) {
		my $entry = $taglist->[$i];
		my %tag = %$entry;
		my $comment = $tag{'subject'};
		my $comment_short;
		if (defined $comment) {
			$comment_short = chop_str($comment, 30, 5);
		}
		if ($alternate) {
			print "<tr class=\"dark\">\n";
		} else {
			print "<tr class=\"light\">\n";
		}
		$alternate ^= 1;
		if (defined $tag{'age'}) {
			print "<td><i>$tag{'age'}</i></td>\n";
		} else {
			print "<td></td>\n";
		}
		print "<td>" .
		      $cgi->a({-href => href(action=>$tag{'reftype'}, hash=>$tag{'refid'}),
		               -class => "list name"}, esc_html($tag{'name'})) .
		      "</td>\n" .
		      "<td>";
		if (defined $comment) {
			print format_subject_html($comment, $comment_short,
			                          href(action=>"tag", hash=>$tag{'id'}));
		}
		print "</td>\n" .
		      "<td class=\"selflink\">";
		if ($tag{'type'} eq "tag") {
			print $cgi->a({-href => href(action=>"tag", hash=>$tag{'id'})}, "tag");
		} else {
			print "&nbsp;";
		}
		print "</td>\n" .
		      "<td class=\"link\">" . " | " .
		      $cgi->a({-href => href(action=>$tag{'reftype'}, hash=>$tag{'refid'})}, $tag{'reftype'});
		if ($tag{'reftype'} eq "commit") {
			print " | " . $cgi->a({-href => href(action=>"shortlog", hash=>$tag{'name'})}, "shortlog") .
			      " | " . $cgi->a({-href => href(action=>"log", hash=>$tag{'name'})}, "log");
		} elsif ($tag{'reftype'} eq "blob") {
			print " | " . $cgi->a({-href => href(action=>"blob_plain", hash=>$tag{'refid'})}, "raw");
		}
		print "</td>\n" .
		      "</tr>";
	}
	if (defined $extra) {
		print "<tr>\n" .
		      "<td colspan=\"5\">$extra</td>\n" .
		      "</tr>\n";
	}
	print "</table>\n";
}

sub git_heads_body {
	# uses global variable $project
	my ($headlist, $head, $from, $to, $extra) = @_;
	$from = 0 unless defined $from;
	$to = $#{$headlist} if (!defined $to || $#{$headlist} < $to);

	print "<table class=\"heads\" cellspacing=\"0\">\n";
	my $alternate = 1;
	for (my $i = $from; $i <= $to; $i++) {
		my $entry = $headlist->[$i];
		my %ref = %$entry;
		my $curr = $ref{'id'} eq $head;
		if ($alternate) {
			print "<tr class=\"dark\">\n";
		} else {
			print "<tr class=\"light\">\n";
		}
		$alternate ^= 1;
		print "<td><i>$ref{'age'}</i></td>\n" .
		      ($curr ? "<td class=\"current_head\">" : "<td>") .
		      $cgi->a({-href => href(action=>"shortlog", hash=>$ref{'name'}),
		               -class => "list name"},esc_html($ref{'name'})) .
		      "</td>\n" .
		      "<td class=\"link\">" .
		      $cgi->a({-href => href(action=>"shortlog", hash=>$ref{'name'})}, "shortlog") . " | " .
		      $cgi->a({-href => href(action=>"log", hash=>$ref{'name'})}, "log") . " | " .
		      $cgi->a({-href => href(action=>"tree", hash=>$ref{'name'}, hash_base=>$ref{'name'})}, "tree") .
		      "</td>\n" .
		      "</tr>";
	}
	if (defined $extra) {
		print "<tr>\n" .
		      "<td colspan=\"3\">$extra</td>\n" .
		      "</tr>\n";
	}
	print "</table>\n";
}

sub git_search_grep_body {
	my ($commitlist, $from, $to, $extra) = @_;
	$from = 0 unless defined $from;
	$to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);

	print "<table class=\"grep\" cellspacing=\"0\">\n";
	my $alternate = 1;
	for (my $i = $from; $i <= $to; $i++) {
		my %co = %{$commitlist->[$i]};
		if (!%co) {
			next;
		}
		my $commit = $co{'id'};
		if ($alternate) {
			print "<tr class=\"dark\">\n";
		} else {
			print "<tr class=\"light\">\n";
		}
		$alternate ^= 1;
		print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
		      "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
		      "<td>" .
		      $cgi->a({-href => href(action=>"commit", hash=>$co{'id'}), -class => "list subject"},
			       esc_html(chop_str($co{'title'}, 50)) . "<br/>");
		my $comment = $co{'comment'};
		foreach my $line (@$comment) {
			if ($line =~ m/^(.*)($search_regexp)(.*)$/i) {
				my $lead = esc_html($1) || "";
				$lead = chop_str($lead, 30, 10);
				my $match = esc_html($2) || "";
				my $trail = esc_html($3) || "";
				$trail = chop_str($trail, 30, 10);
				my $text = "$lead<span class=\"match\">$match</span>$trail";
				print chop_str($text, 80, 5) . "<br/>\n";
			}
		}
		print "</td>\n" .
		      "<td class=\"link\">" .
		      $cgi->a({-href => href(action=>"commit", hash=>$co{'id'})}, "commit") .
		      " | " .
		      $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$co{'id'})}, "tree");
		print "</td>\n" .
		      "</tr>\n";
	}
	if (defined $extra) {
		print "<tr>\n" .
		      "<td colspan=\"3\">$extra</td>\n" .
		      "</tr>\n";
	}
	print "</table>\n";
}

## ======================================================================
## ======================================================================
## actions

sub git_project_list {
	my $order = $cgi->param('o');
	if (defined $order && $order !~ m/none|project|descr|owner|age/) {
		die_error(undef, "Unknown order parameter");
	}

	my @list = git_get_projects_list();
	if (!@list) {
		die_error(undef, "No projects found");
	}

	git_header_html();
	if (-f $home_text) {
		print "<div class=\"index_include\">\n";
		open (my $fd, $home_text);
		print <$fd>;
		close $fd;
		print "</div>\n";
	}
	git_project_list_body(\@list, $order);
	git_footer_html();
}

sub git_forks {
	my $order = $cgi->param('o');
	if (defined $order && $order !~ m/none|project|descr|owner|age/) {
		die_error(undef, "Unknown order parameter");
	}

	my @list = git_get_projects_list($project);
	if (!@list) {
		die_error(undef, "No forks found");
	}

	git_header_html();
	git_print_page_nav('','');
	git_print_header_div('summary', "$project forks");
	git_project_list_body(\@list, $order);
	git_footer_html();
}

sub git_project_index {
	my @projects = git_get_projects_list($project);

	print $cgi->header(
		-type => 'text/plain',
		-charset => 'utf-8',
		-content_disposition => 'inline; filename="index.aux"');

	foreach my $pr (@projects) {
		if (!exists $pr->{'owner'}) {
			$pr->{'owner'} = git_get_project_owner("$pr->{'path'}");
		}

		my ($path, $owner) = ($pr->{'path'}, $pr->{'owner'});
		# quote as in CGI::Util::encode, but keep the slash, and use '+' for ' '
		$path  =~ s/([^a-zA-Z0-9_.\-\/ ])/sprintf("%%%02X", ord($1))/eg;
		$owner =~ s/([^a-zA-Z0-9_.\-\/ ])/sprintf("%%%02X", ord($1))/eg;
		$path  =~ s/ /\+/g;
		$owner =~ s/ /\+/g;

		print "$path $owner\n";
	}
}

sub git_summary {
	my $descr = git_get_project_description($project) || "none";
	my %co = parse_commit("HEAD");
	my %cd = %co ? parse_date($co{'committer_epoch'}, $co{'committer_tz'}) : ();
	my $head = $co{'id'};

	my $owner = git_get_project_owner($project);

	my $refs = git_get_references();
	# These get_*_list functions return one more to allow us to see if
	# there are more ...
	my @taglist  = git_get_tags_list(16);
	my @headlist = git_get_heads_list(16);
	my @forklist;
	my ($check_forks) = gitweb_check_feature('forks');

	if ($check_forks) {
		@forklist = git_get_projects_list($project);
	}

	git_header_html();
	git_print_page_nav('summary','', $head);

	print "<div class=\"title\">&nbsp;</div>\n";
	print "<table cellspacing=\"0\">\n" .
	      "<tr><td>description</td><td>" . esc_html($descr) . "</td></tr>\n" .
	      "<tr><td>owner</td><td>" . esc_html($owner) . "</td></tr>\n";
	if (defined $cd{'rfc2822'}) {
		print "<tr><td>last change</td><td>$cd{'rfc2822'}</td></tr>\n";
	}

	# use per project git URL list in $projectroot/$project/cloneurl
	# or make project git URL from git base URL and project name
	my $url_tag = "URL";
	my @url_list = git_get_project_url_list($project);
	@url_list = map { "$_/$project" } @git_base_url_list unless @url_list;
	foreach my $git_url (@url_list) {
		next unless $git_url;
		print "<tr><td>$url_tag</td><td>$git_url</td></tr>\n";
		$url_tag = "";
	}
	print "</table>\n";

	if (-s "$projectroot/$project/README.html") {
		if (open my $fd, "$projectroot/$project/README.html") {
			print "<div class=\"title\">readme</div>\n";
			print $_ while (<$fd>);
			close $fd;
		}
	}

	# we need to request one more than 16 (0..15) to check if
	# those 16 are all
	my @commitlist = $head ? parse_commits($head, 17) : ();
	if (@commitlist) {
		git_print_header_div('shortlog');
		git_shortlog_body(\@commitlist, 0, 15, $refs,
		                  $#commitlist <=  15 ? undef :
		                  $cgi->a({-href => href(action=>"shortlog")}, "..."));
	}

	if (@taglist) {
		git_print_header_div('tags');
		git_tags_body(\@taglist, 0, 15,
		              $#taglist <=  15 ? undef :
		              $cgi->a({-href => href(action=>"tags")}, "..."));
	}

	if (@headlist) {
		git_print_header_div('heads');
		git_heads_body(\@headlist, $head, 0, 15,
		               $#headlist <= 15 ? undef :
		               $cgi->a({-href => href(action=>"heads")}, "..."));
	}

	if (@forklist) {
		git_print_header_div('forks');
		git_project_list_body(\@forklist, undef, 0, 15,
		                      $#forklist <= 15 ? undef :
		                      $cgi->a({-href => href(action=>"forks")}, "..."),
		                      'noheader');
	}

	git_footer_html();
}

sub git_tag {
	my $head = git_get_head_hash($project);
	git_header_html();
	git_print_page_nav('','', $head,undef,$head);
	my %tag = parse_tag($hash);

	if (! %tag) {
		die_error(undef, "Unknown tag object");
	}

	git_print_header_div('commit', esc_html($tag{'name'}), $hash);
	print "<div class=\"title_text\">\n" .
	      "<table cellspacing=\"0\">\n" .
	      "<tr>\n" .
	      "<td>object</td>\n" .
	      "<td>" . $cgi->a({-class => "list", -href => href(action=>$tag{'type'}, hash=>$tag{'object'})},
	                       $tag{'object'}) . "</td>\n" .
	      "<td class=\"link\">" . $cgi->a({-href => href(action=>$tag{'type'}, hash=>$tag{'object'})},
	                                      $tag{'type'}) . "</td>\n" .
	      "</tr>\n";
	if (defined($tag{'author'})) {
		my %ad = parse_date($tag{'epoch'}, $tag{'tz'});
		print "<tr><td>author</td><td>" . esc_html($tag{'author'}) . "</td></tr>\n";
		print "<tr><td></td><td>" . $ad{'rfc2822'} .
			sprintf(" (%02d:%02d %s)", $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'}) .
			"</td></tr>\n";
	}
	print "</table>\n\n" .
	      "</div>\n";
	print "<div class=\"page_body\">";
	my $comment = $tag{'comment'};
	foreach my $line (@$comment) {
		chomp $line;
		print esc_html($line, -nbsp=>1) . "<br/>\n";
	}
	print "</div>\n";
	git_footer_html();
}

sub git_blame2 {
	my $fd;
	my $ftype;

	my ($have_blame) = gitweb_check_feature('blame');
	if (!$have_blame) {
		die_error('403 Permission denied', "Permission denied");
	}
	die_error('404 Not Found', "File name not defined") if (!$file_name);
	$hash_base ||= git_get_head_hash($project);
	die_error(undef, "Couldn't find base commit") unless ($hash_base);
	my %co = parse_commit($hash_base)
		or die_error(undef, "Reading commit failed");
	if (!defined $hash) {
		$hash = git_get_hash_by_path($hash_base, $file_name, "blob")
			or die_error(undef, "Error looking up file");
	}
	$ftype = git_get_type($hash);
	if ($ftype !~ "blob") {
		die_error('400 Bad Request', "Object is not a blob");
	}
	open ($fd, "-|", git_cmd(), "blame", '-p', '--',
	      $file_name, $hash_base)
		or die_error(undef, "Open git-blame failed");
	git_header_html();
	my $formats_nav =
		$cgi->a({-href => href(action=>"blob", hash=>$hash, hash_base=>$hash_base, file_name=>$file_name)},
		        "blob") .
		" | " .
		$cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base, file_name=>$file_name)},
			"history") .
		" | " .
		$cgi->a({-href => href(action=>"blame", file_name=>$file_name)},
		        "HEAD");
	git_print_page_nav('','', $hash_base,$co{'tree'},$hash_base, $formats_nav);
	git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
	git_print_page_path($file_name, $ftype, $hash_base);
	my @rev_color = (qw(light2 dark2));
	my $num_colors = scalar(@rev_color);
	my $current_color = 0;
	my $last_rev;
	print <<HTML;
<div class="page_body">
<table class="blame">
<tr><th>Commit</th><th>Line</th><th>Data</th></tr>
HTML
	my %metainfo = ();
	while (1) {
		$_ = <$fd>;
		last unless defined $_;
		my ($full_rev, $orig_lineno, $lineno, $group_size) =
		    /^([0-9a-f]{40}) (\d+) (\d+)(?: (\d+))?$/;
		if (!exists $metainfo{$full_rev}) {
			$metainfo{$full_rev} = {};
		}
		my $meta = $metainfo{$full_rev};
		while (<$fd>) {
			last if (s/^\t//);
			if (/^(\S+) (.*)$/) {
				$meta->{$1} = $2;
			}
		}
		my $data = $_;
		chomp $data;
		my $rev = substr($full_rev, 0, 8);
		my $author = $meta->{'author'};
		my %date = parse_date($meta->{'author-time'},
		                      $meta->{'author-tz'});
		my $date = $date{'iso-tz'};
		if ($group_size) {
			$current_color = ++$current_color % $num_colors;
		}
		print "<tr class=\"$rev_color[$current_color]\">\n";
		if ($group_size) {
			print "<td class=\"sha1\"";
			print " title=\"". esc_html($author) . ", $date\"";
			print " rowspan=\"$group_size\"" if ($group_size > 1);
			print ">";
			print $cgi->a({-href => href(action=>"commit",
			                             hash=>$full_rev,
			                             file_name=>$file_name)},
			              esc_html($rev));
			print "</td>\n";
		}
		open (my $dd, "-|", git_cmd(), "rev-parse", "$full_rev^")
			or die_error(undef, "Open git-rev-parse failed");
		my $parent_commit = <$dd>;
		close $dd;
		chomp($parent_commit);
		my $blamed = href(action => 'blame',
		                  file_name => $meta->{'filename'},
		                  hash_base => $parent_commit);
		print "<td class=\"linenr\">";
		print $cgi->a({ -href => "$blamed#l$orig_lineno",
		                -id => "l$lineno",
		                -class => "linenr" },
		              esc_html($lineno));
		print "</td>";
		print "<td class=\"pre\">" . esc_html($data) . "</td>\n";
		print "</tr>\n";
	}
	print "</table>\n";
	print "</div>";
	close $fd
		or print "Reading blob failed\n";
	git_footer_html();
}

sub git_blame {
	my $fd;

	my ($have_blame) = gitweb_check_feature('blame');
	if (!$have_blame) {
		die_error('403 Permission denied', "Permission denied");
	}
	die_error('404 Not Found', "File name not defined") if (!$file_name);
	$hash_base ||= git_get_head_hash($project);
	die_error(undef, "Couldn't find base commit") unless ($hash_base);
	my %co = parse_commit($hash_base)
		or die_error(undef, "Reading commit failed");
	if (!defined $hash) {
		$hash = git_get_hash_by_path($hash_base, $file_name, "blob")
			or die_error(undef, "Error lookup file");
	}
	open ($fd, "-|", git_cmd(), "annotate", '-l', '-t', '-r', $file_name, $hash_base)
		or die_error(undef, "Open git-annotate failed");
	git_header_html();
	my $formats_nav =
		$cgi->a({-href => href(action=>"blob", hash=>$hash, hash_base=>$hash_base, file_name=>$file_name)},
		        "blob") .
		" | " .
		$cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base, file_name=>$file_name)},
			"history") .
		" | " .
		$cgi->a({-href => href(action=>"blame", file_name=>$file_name)},
		        "HEAD");
	git_print_page_nav('','', $hash_base,$co{'tree'},$hash_base, $formats_nav);
	git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
	git_print_page_path($file_name, 'blob', $hash_base);
	print "<div class=\"page_body\">\n";
	print <<HTML;
<table class="blame">
  <tr>
    <th>Commit</th>
    <th>Age</th>
    <th>Author</th>
    <th>Line</th>
    <th>Data</th>
  </tr>
HTML
	my @line_class = (qw(light dark));
	my $line_class_len = scalar (@line_class);
	my $line_class_num = $#line_class;
	while (my $line = <$fd>) {
		my $long_rev;
		my $short_rev;
		my $author;
		my $time;
		my $lineno;
		my $data;
		my $age;
		my $age_str;
		my $age_class;

		chomp $line;
		$line_class_num = ($line_class_num + 1) % $line_class_len;

		if ($line =~ m/^([0-9a-fA-F]{40})\t\(\s*([^\t]+)\t(\d+) [+-]\d\d\d\d\t(\d+)\)(.*)$/) {
			$long_rev = $1;
			$author   = $2;
			$time     = $3;
			$lineno   = $4;
			$data     = $5;
		} else {
			print qq(  <tr><td colspan="5" class="error">Unable to parse: $line</td></tr>\n);
			next;
		}
		$short_rev  = substr ($long_rev, 0, 8);
		$age        = time () - $time;
		$age_str    = age_string ($age);
		$age_str    =~ s/ /&nbsp;/g;
		$age_class  = age_class($age);
		$author     = esc_html ($author);
		$author     =~ s/ /&nbsp;/g;

		$data = untabify($data);
		$data = esc_html ($data);

		print <<HTML;
  <tr class="$line_class[$line_class_num]">
    <td class="sha1"><a href="${\href (action=>"commit", hash=>$long_rev)}" class="text">$short_rev..</a></td>
    <td class="$age_class">$age_str</td>
    <td>$author</td>
    <td class="linenr"><a id="$lineno" href="#$lineno" class="linenr">$lineno</a></td>
    <td class="pre">$data</td>
  </tr>
HTML
	} # while (my $line = <$fd>)
	print "</table>\n\n";
	close $fd
		or print "Reading blob failed.\n";
	print "</div>";
	git_footer_html();
}

sub git_tags {
	my $head = git_get_head_hash($project);
	git_header_html();
	git_print_page_nav('','', $head,undef,$head);
	git_print_header_div('summary', $project);

	my @tagslist = git_get_tags_list();
	if (@tagslist) {
		git_tags_body(\@tagslist);
	}
	git_footer_html();
}

sub git_heads {
	my $head = git_get_head_hash($project);
	git_header_html();
	git_print_page_nav('','', $head,undef,$head);
	git_print_header_div('summary', $project);

	my @headslist = git_get_heads_list();
	if (@headslist) {
		git_heads_body(\@headslist, $head);
	}
	git_footer_html();
}

sub git_blob_plain {
	my $expires;

	if (!defined $hash) {
		if (defined $file_name) {
			my $base = $hash_base || git_get_head_hash($project);
			$hash = git_get_hash_by_path($base, $file_name, "blob")
				or die_error(undef, "Error lookup file");
		} else {
			die_error(undef, "No file name defined");
		}
	} elsif ($hash =~ m/^[0-9a-fA-F]{40}$/) {
		# blobs defined by non-textual hash id's can be cached
		$expires = "+1d";
	}

	my $type = shift;
	open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
		or die_error(undef, "Couldn't cat $file_name, $hash");

	$type ||= blob_mimetype($fd, $file_name);

	# save as filename, even when no $file_name is given
	my $save_as = "$hash";
	if (defined $file_name) {
		$save_as = $file_name;
	} elsif ($type =~ m/^text\//) {
		$save_as .= '.txt';
	}

	print $cgi->header(
		-type => "$type",
		-expires=>$expires,
		-content_disposition => 'inline; filename="' . "$save_as" . '"');
	undef $/;
	binmode STDOUT, ':raw';
	print <$fd>;
	binmode STDOUT, ':utf8'; # as set at the beginning of gitweb.cgi
	$/ = "\n";
	close $fd;
}

sub git_blob {
	my $expires;

	if (!defined $hash) {
		if (defined $file_name) {
			my $base = $hash_base || git_get_head_hash($project);
			$hash = git_get_hash_by_path($base, $file_name, "blob")
				or die_error(undef, "Error lookup file");
		} else {
			die_error(undef, "No file name defined");
		}
	} elsif ($hash =~ m/^[0-9a-fA-F]{40}$/) {
		# blobs defined by non-textual hash id's can be cached
		$expires = "+1d";
	}

	my ($have_blame) = gitweb_check_feature('blame');
	open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
		or die_error(undef, "Couldn't cat $file_name, $hash");
	my $mimetype = blob_mimetype($fd, $file_name);
	if ($mimetype !~ m!^(?:text/|image/(?:gif|png|jpeg)$)!) {
		close $fd;
		return git_blob_plain($mimetype);
	}
	# we can have blame only for text/* mimetype
	$have_blame &&= ($mimetype =~ m!^text/!);

	git_header_html(undef, $expires);
	my $formats_nav = '';
	if (defined $hash_base && (my %co = parse_commit($hash_base))) {
		if (defined $file_name) {
			if ($have_blame) {
				$formats_nav .=
					$cgi->a({-href => href(action=>"blame", hash_base=>$hash_base,
					                       hash=>$hash, file_name=>$file_name)},
					        "blame") .
					" | ";
			}
			$formats_nav .=
				$cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
				                       hash=>$hash, file_name=>$file_name)},
				        "history") .
				" | " .
				$cgi->a({-href => href(action=>"blob_plain",
				                       hash=>$hash, file_name=>$file_name)},
				        "raw") .
				" | " .
				$cgi->a({-href => href(action=>"blob",
				                       hash_base=>"HEAD", file_name=>$file_name)},
				        "HEAD");
		} else {
			$formats_nav .=
				$cgi->a({-href => href(action=>"blob_plain", hash=>$hash)}, "raw");
		}
		git_print_page_nav('','', $hash_base,$co{'tree'},$hash_base, $formats_nav);
		git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
	} else {
		print "<div class=\"page_nav\">\n" .
		      "<br/><br/></div>\n" .
		      "<div class=\"title\">$hash</div>\n";
	}
	git_print_page_path($file_name, "blob", $hash_base);
	print "<div class=\"page_body\">\n";
	if ($mimetype =~ m!^text/!) {
		my $nr;
		while (my $line = <$fd>) {
			chomp $line;
			$nr++;
			$line = untabify($line);
			printf "<div class=\"pre\"><a id=\"l%i\" href=\"#l%i\" class=\"linenr\">%4i</a> %s</div>\n",
			       $nr, $nr, $nr, esc_html($line, -nbsp=>1);
		}
	} elsif ($mimetype =~ m!^image/!) {
		print qq!<img type="$mimetype"!;
		if ($file_name) {
			print qq! alt="$file_name" title="$file_name"!;
		}
		print qq! src="! .
		      href(action=>"blob_plain", hash=>$hash,
		           hash_base=>$hash_base, file_name=>$file_name) .
		      qq!" />\n!;
	}
	close $fd
		or print "Reading blob failed.\n";
	print "</div>";
	git_footer_html();
}

sub git_tree {
	if (!defined $hash_base) {
		$hash_base = "HEAD";
	}
	if (!defined $hash) {
		if (defined $file_name) {
			$hash = git_get_hash_by_path($hash_base, $file_name, "tree");
		} else {
			$hash = $hash_base;
		}
	}
	$/ = "\0";
	open my $fd, "-|", git_cmd(), "ls-tree", '-z', $hash
		or die_error(undef, "Open git-ls-tree failed");
	my @entries = map { chomp; $_ } <$fd>;
	close $fd or die_error(undef, "Reading tree failed");
	$/ = "\n";

	my $refs = git_get_references();
	my $ref = format_ref_marker($refs, $hash_base);
	git_header_html();
	my $basedir = '';
	my ($have_blame) = gitweb_check_feature('blame');
	if (defined $hash_base && (my %co = parse_commit($hash_base))) {
		my @views_nav = ();
		if (defined $file_name) {
			push @views_nav,
				$cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
				                       hash=>$hash, file_name=>$file_name)},
				        "history"),
				$cgi->a({-href => href(action=>"tree",
				                       hash_base=>"HEAD", file_name=>$file_name)},
				        "HEAD"),
		}
		my $snapshot_links = format_snapshot_links($hash);
		if (defined $snapshot_links) {
			# FIXME: Should be available when we have no hash base as well.
			push @views_nav, $snapshot_links;
		}
		git_print_page_nav('tree','', $hash_base, undef, undef, join(' | ', @views_nav));
		git_print_header_div('commit', esc_html($co{'title'}) . $ref, $hash_base);
	} else {
		undef $hash_base;
		print "<div class=\"page_nav\">\n";
		print "<br/><br/></div>\n";
		print "<div class=\"title\">$hash</div>\n";
	}
	if (defined $file_name) {
		$basedir = $file_name;
		if ($basedir ne '' && substr($basedir, -1) ne '/') {
			$basedir .= '/';
		}
	}
	git_print_page_path($file_name, 'tree', $hash_base);
	print "<div class=\"page_body\">\n";
	print "<table cellspacing=\"0\">\n";
	my $alternate = 1;
	# '..' (top directory) link if possible
	if (defined $hash_base &&
	    defined $file_name && $file_name =~ m![^/]+$!) {
		if ($alternate) {
			print "<tr class=\"dark\">\n";
		} else {
			print "<tr class=\"light\">\n";
		}
		$alternate ^= 1;

		my $up = $file_name;
		$up =~ s!/?[^/]+$!!;
		undef $up unless $up;
		# based on git_print_tree_entry
		print '<td class="mode">' . mode_str('040000') . "</td>\n";
		print '<td class="list">';
		print $cgi->a({-href => href(action=>"tree", hash_base=>$hash_base,
		                             file_name=>$up)},
		              "..");
		print "</td>\n";
		print "<td class=\"link\"></td>\n";

		print "</tr>\n";
	}
	foreach my $line (@entries) {
		my %t = parse_ls_tree_line($line, -z => 1);

		if ($alternate) {
			print "<tr class=\"dark\">\n";
		} else {
			print "<tr class=\"light\">\n";
		}
		$alternate ^= 1;

		git_print_tree_entry(\%t, $basedir, $hash_base, $have_blame);

		print "</tr>\n";
	}
	print "</table>\n" .
	      "</div>";
	git_footer_html();
}

sub git_snapshot {
	my @supported_fmts = gitweb_check_feature('snapshot');
	@supported_fmts = filter_snapshot_fmts(@supported_fmts);

	my $format = $cgi->param('sf');
	if (!@supported_fmts) {
		die_error('403 Permission denied', "Permission denied");
	}
	# default to first supported snapshot format
	$format ||= $supported_fmts[0];
	if ($format !~ m/^[a-z0-9]+$/) {
		die_error(undef, "Invalid snapshot format parameter");
	} elsif (!exists($known_snapshot_formats{$format})) {
		die_error(undef, "Unknown snapshot format");
	} elsif (!grep($_ eq $format, @supported_fmts)) {
		die_error(undef, "Unsupported snapshot format");
	}

	if (!defined $hash) {
		$hash = git_get_head_hash($project);
	}

	my $git_command = git_cmd_str();
	my $name = $project;
	$name =~ s,([^/])/*\.git$,$1,;
	$name = basename($name);
	my $filename = to_utf8($name);
	$name =~ s/\047/\047\\\047\047/g;
	my $cmd;
	$filename .= "-$hash$known_snapshot_formats{$format}{'suffix'}";
	$cmd = "$git_command archive " .
		"--format=$known_snapshot_formats{$format}{'format'} " .
		"--prefix=\'$name\'/ $hash";
	if (exists $known_snapshot_formats{$format}{'compressor'}) {
		$cmd .= ' | ' . join ' ', @{$known_snapshot_formats{$format}{'compressor'}};
	}

	print $cgi->header(
		-type => $known_snapshot_formats{$format}{'type'},
		-content_disposition => 'inline; filename="' . "$filename" . '"',
		-status => '200 OK');

	open my $fd, "-|", $cmd
		or die_error(undef, "Execute git-archive failed");
	binmode STDOUT, ':raw';
	print <$fd>;
	binmode STDOUT, ':utf8'; # as set at the beginning of gitweb.cgi
	close $fd;
}

sub git_log {
	my $head = git_get_head_hash($project);
	if (!defined $hash) {
		$hash = $head;
	}
	if (!defined $page) {
		$page = 0;
	}
	my $refs = git_get_references();

	my @commitlist = parse_commits($hash, 101, (100 * $page));

	my $paging_nav = format_paging_nav('log', $hash, $head, $page, (100 * ($page+1)));

	git_header_html();
	git_print_page_nav('log','', $hash,undef,undef, $paging_nav);

	if (!@commitlist) {
		my %co = parse_commit($hash);

		git_print_header_div('summary', $project);
		print "<div class=\"page_body\"> Last change $co{'age_string'}.<br/><br/></div>\n";
	}
	my $to = ($#commitlist >= 99) ? (99) : ($#commitlist);
	for (my $i = 0; $i <= $to; $i++) {
		my %co = %{$commitlist[$i]};
		next if !%co;
		my $commit = $co{'id'};
		my $ref = format_ref_marker($refs, $commit);
		my %ad = parse_date($co{'author_epoch'});
		git_print_header_div('commit',
		               "<span class=\"age\">$co{'age_string'}</span>" .
		               esc_html($co{'title'}) . $ref,
		               $commit);
		print "<div class=\"title_text\">\n" .
		      "<div class=\"log_link\">\n" .
		      $cgi->a({-href => href(action=>"commit", hash=>$commit)}, "commit") .
		      " | " .
		      $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff") .
		      " | " .
		      $cgi->a({-href => href(action=>"tree", hash=>$commit, hash_base=>$commit)}, "tree") .
		      "<br/>\n" .
		      "</div>\n" .
		      "<i>" . esc_html($co{'author_name'}) .  " [$ad{'rfc2822'}]</i><br/>\n" .
		      "</div>\n";

		print "<div class=\"log_body\">\n";
		git_print_log($co{'comment'}, -final_empty_line=> 1);
		print "</div>\n";
	}
	if ($#commitlist >= 100) {
		print "<div class=\"page_nav\">\n";
		print $cgi->a({-href => href(action=>"log", hash=>$hash, page=>$page+1),
			       -accesskey => "n", -title => "Alt-n"}, "next");
		print "</div>\n";
	}
	git_footer_html();
}

sub git_commit {
	$hash ||= $hash_base || "HEAD";
	my %co = parse_commit($hash);
	if (!%co) {
		die_error(undef, "Unknown commit object");
	}
	my %ad = parse_date($co{'author_epoch'}, $co{'author_tz'});
	my %cd = parse_date($co{'committer_epoch'}, $co{'committer_tz'});

	my $parent  = $co{'parent'};
	my $parents = $co{'parents'}; # listref

	# we need to prepare $formats_nav before any parameter munging
	my $formats_nav;
	if (!defined $parent) {
		# --root commitdiff
		$formats_nav .= '(initial)';
	} elsif (@$parents == 1) {
		# single parent commit
		$formats_nav .=
			'(parent: ' .
			$cgi->a({-href => href(action=>"commit",
			                       hash=>$parent)},
			        esc_html(substr($parent, 0, 7))) .
			')';
	} else {
		# merge commit
		$formats_nav .=
			'(merge: ' .
			join(' ', map {
				$cgi->a({-href => href(action=>"commit",
				                       hash=>$_)},
				        esc_html(substr($_, 0, 7)));
			} @$parents ) .
			')';
	}

	if (!defined $parent) {
		$parent = "--root";
	}
	my @difftree;
	open my $fd, "-|", git_cmd(), "diff-tree", '-r', "--no-commit-id",
		@diff_opts,
		(@$parents <= 1 ? $parent : '-c'),
		$hash, "--"
		or die_error(undef, "Open git-diff-tree failed");
	@difftree = map { chomp; $_ } <$fd>;
	close $fd or die_error(undef, "Reading git-diff-tree failed");

	# non-textual hash id's can be cached
	my $expires;
	if ($hash =~ m/^[0-9a-fA-F]{40}$/) {
		$expires = "+1d";
	}
	my $refs = git_get_references();
	my $ref = format_ref_marker($refs, $co{'id'});

	git_header_html(undef, $expires);
	git_print_page_nav('commit', '',
	                   $hash, $co{'tree'}, $hash,
	                   $formats_nav);

	if (defined $co{'parent'}) {
		git_print_header_div('commitdiff', esc_html($co{'title'}) . $ref, $hash);
	} else {
		git_print_header_div('tree', esc_html($co{'title'}) . $ref, $co{'tree'}, $hash);
	}
	print "<div class=\"title_text\">\n" .
	      "<table cellspacing=\"0\">\n";
	print "<tr><td>author</td><td>" . esc_html($co{'author'}) . "</td></tr>\n".
	      "<tr>" .
	      "<td></td><td> $ad{'rfc2822'}";
	if ($ad{'hour_local'} < 6) {
		printf(" (<span class=\"atnight\">%02d:%02d</span> %s)",
		       $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'});
	} else {
		printf(" (%02d:%02d %s)",
		       $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'});
	}
	print "</td>" .
	      "</tr>\n";
	print "<tr><td>committer</td><td>" . esc_html($co{'committer'}) . "</td></tr>\n";
	print "<tr><td></td><td> $cd{'rfc2822'}" .
	      sprintf(" (%02d:%02d %s)", $cd{'hour_local'}, $cd{'minute_local'}, $cd{'tz_local'}) .
	      "</td></tr>\n";
	print "<tr><td>commit</td><td class=\"sha1\">$co{'id'}</td></tr>\n";
	print "<tr>" .
	      "<td>tree</td>" .
	      "<td class=\"sha1\">" .
	      $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$hash),
	               class => "list"}, $co{'tree'}) .
	      "</td>" .
	      "<td class=\"link\">" .
	      $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$hash)},
	              "tree");
	my $snapshot_links = format_snapshot_links($hash);
	if (defined $snapshot_links) {
		print " | " . $snapshot_links;
	}
	print "</td>" .
	      "</tr>\n";

	foreach my $par (@$parents) {
		print "<tr>" .
		      "<td>parent</td>" .
		      "<td class=\"sha1\">" .
		      $cgi->a({-href => href(action=>"commit", hash=>$par),
		               class => "list"}, $par) .
		      "</td>" .
		      "<td class=\"link\">" .
		      $cgi->a({-href => href(action=>"commit", hash=>$par)}, "commit") .
		      " | " .
		      $cgi->a({-href => href(action=>"commitdiff", hash=>$hash, hash_parent=>$par)}, "diff") .
		      "</td>" .
		      "</tr>\n";
	}
	print "</table>".
	      "</div>\n";

	print "<div class=\"page_body\">\n";
	git_print_log($co{'comment'});
	print "</div>\n";

	git_difftree_body(\@difftree, $hash, @$parents);

	git_footer_html();
}

sub git_object {
	# object is defined by:
	# - hash or hash_base alone
	# - hash_base and file_name
	my $type;

	# - hash or hash_base alone
	if ($hash || ($hash_base && !defined $file_name)) {
		my $object_id = $hash || $hash_base;

		my $git_command = git_cmd_str();
		open my $fd, "-|", "$git_command cat-file -t $object_id 2>/dev/null"
			or die_error('404 Not Found', "Object does not exist");
		$type = <$fd>;
		chomp $type;
		close $fd
			or die_error('404 Not Found', "Object does not exist");

	# - hash_base and file_name
	} elsif ($hash_base && defined $file_name) {
		$file_name =~ s,/+$,,;

		system(git_cmd(), "cat-file", '-e', $hash_base) == 0
			or die_error('404 Not Found', "Base object does not exist");

		# here errors should not hapen
		open my $fd, "-|", git_cmd(), "ls-tree", $hash_base, "--", $file_name
			or die_error(undef, "Open git-ls-tree failed");
		my $line = <$fd>;
		close $fd;

		#'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa	panic.c'
		unless ($line && $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t/) {
			die_error('404 Not Found', "File or directory for given base does not exist");
		}
		$type = $2;
		$hash = $3;
	} else {
		die_error('404 Not Found', "Not enough information to find object");
	}

	print $cgi->redirect(-uri => href(action=>$type, -full=>1,
	                                  hash=>$hash, hash_base=>$hash_base,
	                                  file_name=>$file_name),
	                     -status => '302 Found');
}

sub git_blobdiff {
	my $format = shift || 'html';

	my $fd;
	my @difftree;
	my %diffinfo;
	my $expires;

	# preparing $fd and %diffinfo for git_patchset_body
	# new style URI
	if (defined $hash_base && defined $hash_parent_base) {
		if (defined $file_name) {
			# read raw output
			open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
				$hash_parent_base, $hash_base,
				"--", (defined $file_parent ? $file_parent : ()), $file_name
				or die_error(undef, "Open git-diff-tree failed");
			@difftree = map { chomp; $_ } <$fd>;
			close $fd
				or die_error(undef, "Reading git-diff-tree failed");
			@difftree
				or die_error('404 Not Found', "Blob diff not found");

		} elsif (defined $hash &&
		         $hash =~ /[0-9a-fA-F]{40}/) {
			# try to find filename from $hash

			# read filtered raw output
			open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
				$hash_parent_base, $hash_base, "--"
				or die_error(undef, "Open git-diff-tree failed");
			@difftree =
				# ':100644 100644 03b21826... 3b93d5e7... M	ls-files.c'
				# $hash == to_id
				grep { /^:[0-7]{6} [0-7]{6} [0-9a-fA-F]{40} $hash/ }
				map { chomp; $_ } <$fd>;
			close $fd
				or die_error(undef, "Reading git-diff-tree failed");
			@difftree
				or die_error('404 Not Found', "Blob diff not found");

		} else {
			die_error('404 Not Found', "Missing one of the blob diff parameters");
		}

		if (@difftree > 1) {
			die_error('404 Not Found', "Ambiguous blob diff specification");
		}

		%diffinfo = parse_difftree_raw_line($difftree[0]);
		$file_parent ||= $diffinfo{'from_file'} || $file_name || $diffinfo{'file'};
		$file_name   ||= $diffinfo{'to_file'}   || $diffinfo{'file'};

		$hash_parent ||= $diffinfo{'from_id'};
		$hash        ||= $diffinfo{'to_id'};

		# non-textual hash id's can be cached
		if ($hash_base =~ m/^[0-9a-fA-F]{40}$/ &&
		    $hash_parent_base =~ m/^[0-9a-fA-F]{40}$/) {
			$expires = '+1d';
		}

		# open patch output
		open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
			'-p', ($format eq 'html' ? "--full-index" : ()),
			$hash_parent_base, $hash_base,
			"--", (defined $file_parent ? $file_parent : ()), $file_name
			or die_error(undef, "Open git-diff-tree failed");
	}

	# old/legacy style URI
	if (!%diffinfo && # if new style URI failed
	    defined $hash && defined $hash_parent) {
		# fake git-diff-tree raw output
		$diffinfo{'from_mode'} = $diffinfo{'to_mode'} = "blob";
		$diffinfo{'from_id'} = $hash_parent;
		$diffinfo{'to_id'}   = $hash;
		if (defined $file_name) {
			if (defined $file_parent) {
				$diffinfo{'status'} = '2';
				$diffinfo{'from_file'} = $file_parent;
				$diffinfo{'to_file'}   = $file_name;
			} else { # assume not renamed
				$diffinfo{'status'} = '1';
				$diffinfo{'from_file'} = $file_name;
				$diffinfo{'to_file'}   = $file_name;
			}
		} else { # no filename given
			$diffinfo{'status'} = '2';
			$diffinfo{'from_file'} = $hash_parent;
			$diffinfo{'to_file'}   = $hash;
		}

		# non-textual hash id's can be cached
		if ($hash =~ m/^[0-9a-fA-F]{40}$/ &&
		    $hash_parent =~ m/^[0-9a-fA-F]{40}$/) {
			$expires = '+1d';
		}

		# open patch output
		open $fd, "-|", git_cmd(), "diff", @diff_opts,
			'-p', ($format eq 'html' ? "--full-index" : ()),
			$hash_parent, $hash, "--"
			or die_error(undef, "Open git-diff failed");
	} else  {
		die_error('404 Not Found', "Missing one of the blob diff parameters")
			unless %diffinfo;
	}

	# header
	if ($format eq 'html') {
		my $formats_nav =
			$cgi->a({-href => href(action=>"blobdiff_plain",
			                       hash=>$hash, hash_parent=>$hash_parent,
			                       hash_base=>$hash_base, hash_parent_base=>$hash_parent_base,
			                       file_name=>$file_name, file_parent=>$file_parent)},
			        "raw");
		git_header_html(undef, $expires);
		if (defined $hash_base && (my %co = parse_commit($hash_base))) {
			git_print_page_nav('','', $hash_base,$co{'tree'},$hash_base, $formats_nav);
			git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
		} else {
			print "<div class=\"page_nav\"><br/>$formats_nav<br/></div>\n";
			print "<div class=\"title\">$hash vs $hash_parent</div>\n";
		}
		if (defined $file_name) {
			git_print_page_path($file_name, "blob", $hash_base);
		} else {
			print "<div class=\"page_path\"></div>\n";
		}

	} elsif ($format eq 'plain') {
		print $cgi->header(
			-type => 'text/plain',
			-charset => 'utf-8',
			-expires => $expires,
			-content_disposition => 'inline; filename="' . "$file_name" . '.patch"');

		print "X-Git-Url: " . $cgi->self_url() . "\n\n";

	} else {
		die_error(undef, "Unknown blobdiff format");
	}

	# patch
	if ($format eq 'html') {
		print "<div class=\"page_body\">\n";

		git_patchset_body($fd, [ \%diffinfo ], $hash_base, $hash_parent_base);
		close $fd;

		print "</div>\n"; # class="page_body"
		git_footer_html();

	} else {
		while (my $line = <$fd>) {
			$line =~ s!a/($hash|$hash_parent)!'a/'.esc_path($diffinfo{'from_file'})!eg;
			$line =~ s!b/($hash|$hash_parent)!'b/'.esc_path($diffinfo{'to_file'})!eg;

			print $line;

			last if $line =~ m!^\+\+\+!;
		}
		local $/ = undef;
		print <$fd>;
		close $fd;
	}
}

sub git_blobdiff_plain {
	git_blobdiff('plain');
}

sub git_commitdiff {
	my $format = shift || 'html';
	$hash ||= $hash_base || "HEAD";
	my %co = parse_commit($hash);
	if (!%co) {
		die_error(undef, "Unknown commit object");
	}

	# choose format for commitdiff for merge
	if (! defined $hash_parent && @{$co{'parents'}} > 1) {
		$hash_parent = '--cc';
	}
	# we need to prepare $formats_nav before almost any parameter munging
	my $formats_nav;
	if ($format eq 'html') {
		$formats_nav =
			$cgi->a({-href => href(action=>"commitdiff_plain",
			                       hash=>$hash, hash_parent=>$hash_parent)},
			        "raw");

		if (defined $hash_parent &&
		    $hash_parent ne '-c' && $hash_parent ne '--cc') {
			# commitdiff with two commits given
			my $hash_parent_short = $hash_parent;
			if ($hash_parent =~ m/^[0-9a-fA-F]{40}$/) {
				$hash_parent_short = substr($hash_parent, 0, 7);
			}
			$formats_nav .=
				' (from';
			for (my $i = 0; $i < @{$co{'parents'}}; $i++) {
				if ($co{'parents'}[$i] eq $hash_parent) {
					$formats_nav .= ' parent ' . ($i+1);
					last;
				}
			}
			$formats_nav .= ': ' .
				$cgi->a({-href => href(action=>"commitdiff",
				                       hash=>$hash_parent)},
				        esc_html($hash_parent_short)) .
				')';
		} elsif (!$co{'parent'}) {
			# --root commitdiff
			$formats_nav .= ' (initial)';
		} elsif (scalar @{$co{'parents'}} == 1) {
			# single parent commit
			$formats_nav .=
				' (parent: ' .
				$cgi->a({-href => href(action=>"commitdiff",
				                       hash=>$co{'parent'})},
				        esc_html(substr($co{'parent'}, 0, 7))) .
				')';
		} else {
			# merge commit
			if ($hash_parent eq '--cc') {
				$formats_nav .= ' | ' .
					$cgi->a({-href => href(action=>"commitdiff",
					                       hash=>$hash, hash_parent=>'-c')},
					        'combined');
			} else { # $hash_parent eq '-c'
				$formats_nav .= ' | ' .
					$cgi->a({-href => href(action=>"commitdiff",
					                       hash=>$hash, hash_parent=>'--cc')},
					        'compact');
			}
			$formats_nav .=
				' (merge: ' .
				join(' ', map {
					$cgi->a({-href => href(action=>"commitdiff",
					                       hash=>$_)},
					        esc_html(substr($_, 0, 7)));
				} @{$co{'parents'}} ) .
				')';
		}
	}

	my $hash_parent_param = $hash_parent;
	if (!defined $hash_parent_param) {
		# --cc for multiple parents, --root for parentless
		$hash_parent_param =
			@{$co{'parents'}} > 1 ? '--cc' : $co{'parent'} || '--root';
	}

	# read commitdiff
	my $fd;
	my @difftree;
	if ($format eq 'html') {
		open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
			"--no-commit-id", "--patch-with-raw", "--full-index",
			$hash_parent_param, $hash, "--"
			or die_error(undef, "Open git-diff-tree failed");

		while (my $line = <$fd>) {
			chomp $line;
			# empty line ends raw part of diff-tree output
			last unless $line;
			push @difftree, scalar parse_difftree_raw_line($line);
		}

	} elsif ($format eq 'plain') {
		open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
			'-p', $hash_parent_param, $hash, "--"
			or die_error(undef, "Open git-diff-tree failed");

	} else {
		die_error(undef, "Unknown commitdiff format");
	}

	# non-textual hash id's can be cached
	my $expires;
	if ($hash =~ m/^[0-9a-fA-F]{40}$/) {
		$expires = "+1d";
	}

	# write commit message
	if ($format eq 'html') {
		my $refs = git_get_references();
		my $ref = format_ref_marker($refs, $co{'id'});

		git_header_html(undef, $expires);
		git_print_page_nav('commitdiff','', $hash,$co{'tree'},$hash, $formats_nav);
		git_print_header_div('commit', esc_html($co{'title'}) . $ref, $hash);
		git_print_authorship(\%co);
		print "<div class=\"page_body\">\n";
		if (@{$co{'comment'}} > 1) {
			print "<div class=\"log\">\n";
			git_print_log($co{'comment'}, -final_empty_line=> 1, -remove_title => 1);
			print "</div>\n"; # class="log"
		}

	} elsif ($format eq 'plain') {
		my $refs = git_get_references("tags");
		my $tagname = git_get_rev_name_tags($hash);
		my $filename = basename($project) . "-$hash.patch";

		print $cgi->header(
			-type => 'text/plain',
			-charset => 'utf-8',
			-expires => $expires,
			-content_disposition => 'inline; filename="' . "$filename" . '"');
		my %ad = parse_date($co{'author_epoch'}, $co{'author_tz'});
		print <<TEXT;
From: $co{'author'}
Date: $ad{'rfc2822'} ($ad{'tz_local'})
Subject: $co{'title'}
TEXT
		print "X-Git-Tag: $tagname\n" if $tagname;
		print "X-Git-Url: " . $cgi->self_url() . "\n\n";

		foreach my $line (@{$co{'comment'}}) {
			print "$line\n";
		}
		print "---\n\n";
	}

	# write patch
	if ($format eq 'html') {
		my $use_parents = !defined $hash_parent ||
			$hash_parent eq '-c' || $hash_parent eq '--cc';
		git_difftree_body(\@difftree, $hash,
		                  $use_parents ? @{$co{'parents'}} : $hash_parent);
		print "<br/>\n";

		git_patchset_body($fd, \@difftree, $hash,
		                  $use_parents ? @{$co{'parents'}} : $hash_parent);
		close $fd;
		print "</div>\n"; # class="page_body"
		git_footer_html();

	} elsif ($format eq 'plain') {
		local $/ = undef;
		print <$fd>;
		close $fd
			or print "Reading git-diff-tree failed\n";
	}
}

sub git_commitdiff_plain {
	git_commitdiff('plain');
}

sub git_history {
	if (!defined $hash_base) {
		$hash_base = git_get_head_hash($project);
	}
	if (!defined $page) {
		$page = 0;
	}
	my $ftype;
	my %co = parse_commit($hash_base);
	if (!%co) {
		die_error(undef, "Unknown commit object");
	}

	my $refs = git_get_references();
	my $limit = sprintf("--max-count=%i", (100 * ($page+1)));

	if (!defined $hash && defined $file_name) {
		$hash = git_get_hash_by_path($hash_base, $file_name);
	}
	if (defined $hash) {
		$ftype = git_get_type($hash);
	}

	my @commitlist = parse_commits($hash_base, 101, (100 * $page), "--full-history", $file_name);

	my $paging_nav = '';
	if ($page > 0) {
		$paging_nav .=
			$cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base,
			                       file_name=>$file_name)},
			        "first");
		$paging_nav .= " &sdot; " .
			$cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base,
			                       file_name=>$file_name, page=>$page-1),
			         -accesskey => "p", -title => "Alt-p"}, "prev");
	} else {
		$paging_nav .= "first";
		$paging_nav .= " &sdot; prev";
	}
	if ($#commitlist >= 100) {
		$paging_nav .= " &sdot; " .
			$cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base,
			                       file_name=>$file_name, page=>$page+1),
			         -accesskey => "n", -title => "Alt-n"}, "next");
	} else {
		$paging_nav .= " &sdot; next";
	}
	my $next_link = '';
	if ($#commitlist >= 100) {
		$next_link =
			$cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base,
			                       file_name=>$file_name, page=>$page+1),
			         -accesskey => "n", -title => "Alt-n"}, "next");
	}

	git_header_html();
	git_print_page_nav('history','', $hash_base,$co{'tree'},$hash_base, $paging_nav);
	git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
	git_print_page_path($file_name, $ftype, $hash_base);

	git_history_body(\@commitlist, 0, 99,
	                 $refs, $hash_base, $ftype, $next_link);

	git_footer_html();
}

sub git_search {
	my ($have_search) = gitweb_check_feature('search');
	if (!$have_search) {
		die_error('403 Permission denied', "Permission denied");
	}
	if (!defined $searchtext) {
		die_error(undef, "Text field empty");
	}
	if (!defined $hash) {
		$hash = git_get_head_hash($project);
	}
	my %co = parse_commit($hash);
	if (!%co) {
		die_error(undef, "Unknown commit object");
	}
	if (!defined $page) {
		$page = 0;
	}

	$searchtype ||= 'commit';
	if ($searchtype eq 'pickaxe') {
		# pickaxe may take all resources of your box and run for several minutes
		# with every query - so decide by yourself how public you make this feature
		my ($have_pickaxe) = gitweb_check_feature('pickaxe');
		if (!$have_pickaxe) {
			die_error('403 Permission denied', "Permission denied");
		}
	}
	if ($searchtype eq 'grep') {
		my ($have_grep) = gitweb_check_feature('grep');
		if (!$have_grep) {
			die_error('403 Permission denied', "Permission denied");
		}
	}

	git_header_html();

	if ($searchtype eq 'commit' or $searchtype eq 'author' or $searchtype eq 'committer') {
		my $greptype;
		if ($searchtype eq 'commit') {
			$greptype = "--grep=";
		} elsif ($searchtype eq 'author') {
			$greptype = "--author=";
		} elsif ($searchtype eq 'committer') {
			$greptype = "--committer=";
		}
		$greptype .= $search_regexp;
		my @commitlist = parse_commits($hash, 101, (100 * $page), $greptype);

		my $paging_nav = '';
		if ($page > 0) {
			$paging_nav .=
				$cgi->a({-href => href(action=>"search", hash=>$hash,
				                       searchtext=>$searchtext, searchtype=>$searchtype)},
				        "first");
			$paging_nav .= " &sdot; " .
				$cgi->a({-href => href(action=>"search", hash=>$hash,
				                       searchtext=>$searchtext, searchtype=>$searchtype,
				                       page=>$page-1),
				         -accesskey => "p", -title => "Alt-p"}, "prev");
		} else {
			$paging_nav .= "first";
			$paging_nav .= " &sdot; prev";
		}
		if ($#commitlist >= 100) {
			$paging_nav .= " &sdot; " .
				$cgi->a({-href => href(action=>"search", hash=>$hash,
				                       searchtext=>$searchtext, searchtype=>$searchtype,
				                       page=>$page+1),
				         -accesskey => "n", -title => "Alt-n"}, "next");
		} else {
			$paging_nav .= " &sdot; next";
		}
		my $next_link = '';
		if ($#commitlist >= 100) {
			$next_link =
				$cgi->a({-href => href(action=>"search", hash=>$hash,
				                       searchtext=>$searchtext, searchtype=>$searchtype,
				                       page=>$page+1),
				         -accesskey => "n", -title => "Alt-n"}, "next");
		}

		git_print_page_nav('','', $hash,$co{'tree'},$hash, $paging_nav);
		git_print_header_div('commit', esc_html($co{'title'}), $hash);
		git_search_grep_body(\@commitlist, 0, 99, $next_link);
	}

	if ($searchtype eq 'pickaxe') {
		git_print_page_nav('','', $hash,$co{'tree'},$hash);
		git_print_header_div('commit', esc_html($co{'title'}), $hash);

		print "<table cellspacing=\"0\">\n";
		my $alternate = 1;
		$/ = "\n";
		my $git_command = git_cmd_str();
		my $searchqtext = $searchtext;
		$searchqtext =~ s/'/'\\''/;
		open my $fd, "-|", "$git_command rev-list $hash | " .
			"$git_command diff-tree -r --stdin -S\'$searchqtext\'";
		undef %co;
		my @files;
		while (my $line = <$fd>) {
			if (%co && $line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)\t(.*)$/) {
				my %set;
				$set{'file'} = $6;
				$set{'from_id'} = $3;
				$set{'to_id'} = $4;
				$set{'id'} = $set{'to_id'};
				if ($set{'id'} =~ m/0{40}/) {
					$set{'id'} = $set{'from_id'};
				}
				if ($set{'id'} =~ m/0{40}/) {
					next;
				}
				push @files, \%set;
			} elsif ($line =~ m/^([0-9a-fA-F]{40})$/){
				if (%co) {
					if ($alternate) {
						print "<tr class=\"dark\">\n";
					} else {
						print "<tr class=\"light\">\n";
					}
					$alternate ^= 1;
					print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
					      "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
					      "<td>" .
					      $cgi->a({-href => href(action=>"commit", hash=>$co{'id'}),
					              -class => "list subject"},
					              esc_html(chop_str($co{'title'}, 50)) . "<br/>");
					while (my $setref = shift @files) {
						my %set = %$setref;
						print $cgi->a({-href => href(action=>"blob", hash_base=>$co{'id'},
						                             hash=>$set{'id'}, file_name=>$set{'file'}),
						              -class => "list"},
						              "<span class=\"match\">" . esc_path($set{'file'}) . "</span>") .
						      "<br/>\n";
					}
					print "</td>\n" .
					      "<td class=\"link\">" .
					      $cgi->a({-href => href(action=>"commit", hash=>$co{'id'})}, "commit") .
					      " | " .
					      $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$co{'id'})}, "tree");
					print "</td>\n" .
					      "</tr>\n";
				}
				%co = parse_commit($1);
			}
		}
		close $fd;

		print "</table>\n";
	}

	if ($searchtype eq 'grep') {
		git_print_page_nav('','', $hash,$co{'tree'},$hash);
		git_print_header_div('commit', esc_html($co{'title'}), $hash);

		print "<table cellspacing=\"0\">\n";
		my $alternate = 1;
		my $matches = 0;
		$/ = "\n";
		open my $fd, "-|", git_cmd(), 'grep', '-n', '-i', '-E', $searchtext, $co{'tree'};
		my $lastfile = '';
		while (my $line = <$fd>) {
			chomp $line;
			my ($file, $lno, $ltext, $binary);
			last if ($matches++ > 1000);
			if ($line =~ /^Binary file (.+) matches$/) {
				$file = $1;
				$binary = 1;
			} else {
				(undef, $file, $lno, $ltext) = split(/:/, $line, 4);
			}
			if ($file ne $lastfile) {
				$lastfile and print "</td></tr>\n";
				if ($alternate++) {
					print "<tr class=\"dark\">\n";
				} else {
					print "<tr class=\"light\">\n";
				}
				print "<td class=\"list\">".
					$cgi->a({-href => href(action=>"blob", hash=>$co{'hash'},
							       file_name=>"$file"),
						-class => "list"}, esc_path($file));
				print "</td><td>\n";
				$lastfile = $file;
			}
			if ($binary) {
				print "<div class=\"binary\">Binary file</div>\n";
			} else {
				$ltext = untabify($ltext);
				if ($ltext =~ m/^(.*)($searchtext)(.*)$/i) {
					$ltext = esc_html($1, -nbsp=>1);
					$ltext .= '<span class="match">';
					$ltext .= esc_html($2, -nbsp=>1);
					$ltext .= '</span>';
					$ltext .= esc_html($3, -nbsp=>1);
				} else {
					$ltext = esc_html($ltext, -nbsp=>1);
				}
				print "<div class=\"pre\">" .
					$cgi->a({-href => href(action=>"blob", hash=>$co{'hash'},
							       file_name=>"$file").'#l'.$lno,
						-class => "linenr"}, sprintf('%4i', $lno))
					. ' ' .  $ltext . "</div>\n";
			}
		}
		if ($lastfile) {
			print "</td></tr>\n";
			if ($matches > 1000) {
				print "<div class=\"diff nodifferences\">Too many matches, listing trimmed</div>\n";
			}
		} else {
			print "<div class=\"diff nodifferences\">No matches found</div>\n";
		}
		close $fd;

		print "</table>\n";
	}
	git_footer_html();
}

sub git_search_help {
	git_header_html();
	git_print_page_nav('','', $hash,$hash,$hash);
	print <<EOT;
<dl>
<dt><b>commit</b></dt>
<dd>The commit messages and authorship information will be scanned for the given string.</dd>
EOT
	my ($have_grep) = gitweb_check_feature('grep');
	if ($have_grep) {
		print <<EOT;
<dt><b>grep</b></dt>
<dd>All files in the currently selected tree (HEAD unless you are explicitly browsing
    a different one) are searched for the given
<a href="http://en.wikipedia.org/wiki/Regular_expression">regular expression</a>
(POSIX extended) and the matches are listed. On large
trees, this search can take a while and put some strain on the server, so please use it with
some consideration.</dd>
EOT
	}
	print <<EOT;
<dt><b>author</b></dt>
<dd>Name and e-mail of the change author and date of birth of the patch will be scanned for the given string.</dd>
<dt><b>committer</b></dt>
<dd>Name and e-mail of the committer and date of commit will be scanned for the given string.</dd>
EOT
	my ($have_pickaxe) = gitweb_check_feature('pickaxe');
	if ($have_pickaxe) {
		print <<EOT;
<dt><b>pickaxe</b></dt>
<dd>All commits that caused the string to appear or disappear from any file (changes that
added, removed or "modified" the string) will be listed. This search can take a while and
takes a lot of strain on the server, so please use it wisely.</dd>
EOT
	}
	print "</dl>\n";
	git_footer_html();
}

sub git_shortlog {
	my $head = git_get_head_hash($project);
	if (!defined $hash) {
		$hash = $head;
	}
	if (!defined $page) {
		$page = 0;
	}
	my $refs = git_get_references();

	my @commitlist = parse_commits($hash, 101, (100 * $page));

	my $paging_nav = format_paging_nav('shortlog', $hash, $head, $page, (100 * ($page+1)));
	my $next_link = '';
	if ($#commitlist >= 100) {
		$next_link =
			$cgi->a({-href => href(action=>"shortlog", hash=>$hash, page=>$page+1),
			         -accesskey => "n", -title => "Alt-n"}, "next");
	}

	git_header_html();
	git_print_page_nav('shortlog','', $hash,$hash,$hash, $paging_nav);
	git_print_header_div('summary', $project);

	git_shortlog_body(\@commitlist, 0, 99, $refs, $next_link);

	git_footer_html();
}

## ......................................................................
## feeds (RSS, Atom; OPML)

sub git_feed {
	my $format = shift || 'atom';
	my ($have_blame) = gitweb_check_feature('blame');

	# Atom: http://www.atomenabled.org/developers/syndication/
	# RSS:  http://www.notestips.com/80256B3A007F2692/1/NAMO5P9UPQ
	if ($format ne 'rss' && $format ne 'atom') {
		die_error(undef, "Unknown web feed format");
	}

	# log/feed of current (HEAD) branch, log of given branch, history of file/directory
	my $head = $hash || 'HEAD';
	my @commitlist = parse_commits($head, 150, 0, undef, $file_name);

	my %latest_commit;
	my %latest_date;
	my $content_type = "application/$format+xml";
	if (defined $cgi->http('HTTP_ACCEPT') &&
		 $cgi->Accept('text/xml') > $cgi->Accept($content_type)) {
		# browser (feed reader) prefers text/xml
		$content_type = 'text/xml';
	}
	if (defined($commitlist[0])) {
		%latest_commit = %{$commitlist[0]};
		%latest_date   = parse_date($latest_commit{'author_epoch'});
		print $cgi->header(
			-type => $content_type,
			-charset => 'utf-8',
			-last_modified => $latest_date{'rfc2822'});
	} else {
		print $cgi->header(
			-type => $content_type,
			-charset => 'utf-8');
	}

	# Optimization: skip generating the body if client asks only
	# for Last-Modified date.
	return if ($cgi->request_method() eq 'HEAD');

	# header variables
	my $title = "$site_name - $project/$action";
	my $feed_type = 'log';
	if (defined $hash) {
		$title .= " - '$hash'";
		$feed_type = 'branch log';
		if (defined $file_name) {
			$title .= " :: $file_name";
			$feed_type = 'history';
		}
	} elsif (defined $file_name) {
		$title .= " - $file_name";
		$feed_type = 'history';
	}
	$title .= " $feed_type";
	my $descr = git_get_project_description($project);
	if (defined $descr) {
		$descr = esc_html($descr);
	} else {
		$descr = "$project " .
		         ($format eq 'rss' ? 'RSS' : 'Atom') .
		         " feed";
	}
	my $owner = git_get_project_owner($project);
	$owner = esc_html($owner);

	#header
	my $alt_url;
	if (defined $file_name) {
		$alt_url = href(-full=>1, action=>"history", hash=>$hash, file_name=>$file_name);
	} elsif (defined $hash) {
		$alt_url = href(-full=>1, action=>"log", hash=>$hash);
	} else {
		$alt_url = href(-full=>1, action=>"summary");
	}
	print qq!<?xml version="1.0" encoding="utf-8"?>\n!;
	if ($format eq 'rss') {
		print <<XML;
<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">
<channel>
XML
		print "<title>$title</title>\n" .
		      "<link>$alt_url</link>\n" .
		      "<description>$descr</description>\n" .
		      "<language>en</language>\n";
	} elsif ($format eq 'atom') {
		print <<XML;
<feed xmlns="http://www.w3.org/2005/Atom">
XML
		print "<title>$title</title>\n" .
		      "<subtitle>$descr</subtitle>\n" .
		      '<link rel="alternate" type="text/html" href="' .
		      $alt_url . '" />' . "\n" .
		      '<link rel="self" type="' . $content_type . '" href="' .
		      $cgi->self_url() . '" />' . "\n" .
		      "<id>" . href(-full=>1) . "</id>\n" .
		      # use project owner for feed author
		      "<author><name>$owner</name></author>\n";
		if (defined $favicon) {
			print "<icon>" . esc_url($favicon) . "</icon>\n";
		}
		if (defined $logo_url) {
			# not twice as wide as tall: 72 x 27 pixels
			print "<logo>" . esc_url($logo) . "</logo>\n";
		}
		if (! %latest_date) {
			# dummy date to keep the feed valid until commits trickle in:
			print "<updated>1970-01-01T00:00:00Z</updated>\n";
		} else {
			print "<updated>$latest_date{'iso-8601'}</updated>\n";
		}
	}

	# contents
	for (my $i = 0; $i <= $#commitlist; $i++) {
		my %co = %{$commitlist[$i]};
		my $commit = $co{'id'};
		# we read 150, we always show 30 and the ones more recent than 48 hours
		if (($i >= 20) && ((time - $co{'author_epoch'}) > 48*60*60)) {
			last;
		}
		my %cd = parse_date($co{'author_epoch'});

		# get list of changed files
		open my $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
			$co{'parent'} || "--root",
			$co{'id'}, "--", (defined $file_name ? $file_name : ())
			or next;
		my @difftree = map { chomp; $_ } <$fd>;
		close $fd
			or next;

		# print element (entry, item)
		my $co_url = href(-full=>1, action=>"commit", hash=>$commit);
		if ($format eq 'rss') {
			print "<item>\n" .
			      "<title>" . esc_html($co{'title'}) . "</title>\n" .
			      "<author>" . esc_html($co{'author'}) . "</author>\n" .
			      "<pubDate>$cd{'rfc2822'}</pubDate>\n" .
			      "<guid isPermaLink=\"true\">$co_url</guid>\n" .
			      "<link>$co_url</link>\n" .
			      "<description>" . esc_html($co{'title'}) . "</description>\n" .
			      "<content:encoded>" .
			      "<![CDATA[\n";
		} elsif ($format eq 'atom') {
			print "<entry>\n" .
			      "<title type=\"html\">" . esc_html($co{'title'}) . "</title>\n" .
			      "<updated>$cd{'iso-8601'}</updated>\n" .
			      "<author>\n" .
			      "  <name>" . esc_html($co{'author_name'}) . "</name>\n";
			if ($co{'author_email'}) {
				print "  <email>" . esc_html($co{'author_email'}) . "</email>\n";
			}
			print "</author>\n" .
			      # use committer for contributor
			      "<contributor>\n" .
			      "  <name>" . esc_html($co{'committer_name'}) . "</name>\n";
			if ($co{'committer_email'}) {
				print "  <email>" . esc_html($co{'committer_email'}) . "</email>\n";
			}
			print "</contributor>\n" .
			      "<published>$cd{'iso-8601'}</published>\n" .
			      "<link rel=\"alternate\" type=\"text/html\" href=\"$co_url\" />\n" .
			      "<id>$co_url</id>\n" .
			      "<content type=\"xhtml\" xml:base=\"" . esc_url($my_url) . "\">\n" .
			      "<div xmlns=\"http://www.w3.org/1999/xhtml\">\n";
		}
		my $comment = $co{'comment'};
		print "<pre>\n";
		foreach my $line (@$comment) {
			$line = esc_html($line);
			print "$line\n";
		}
		print "</pre><ul>\n";
		foreach my $difftree_line (@difftree) {
			my %difftree = parse_difftree_raw_line($difftree_line);
			next if !$difftree{'from_id'};

			my $file = $difftree{'file'} || $difftree{'to_file'};

			print "<li>" .
			      "[" .
			      $cgi->a({-href => href(-full=>1, action=>"blobdiff",
			                             hash=>$difftree{'to_id'}, hash_parent=>$difftree{'from_id'},
			                             hash_base=>$co{'id'}, hash_parent_base=>$co{'parent'},
			                             file_name=>$file, file_parent=>$difftree{'from_file'}),
			              -title => "diff"}, 'D');
			if ($have_blame) {
				print $cgi->a({-href => href(-full=>1, action=>"blame",
				                             file_name=>$file, hash_base=>$commit),
				              -title => "blame"}, 'B');
			}
			# if this is not a feed of a file history
			if (!defined $file_name || $file_name ne $file) {
				print $cgi->a({-href => href(-full=>1, action=>"history",
				                             file_name=>$file, hash=>$commit),
				              -title => "history"}, 'H');
			}
			$file = esc_path($file);
			print "] ".
			      "$file</li>\n";
		}
		if ($format eq 'rss') {
			print "</ul>]]>\n" .
			      "</content:encoded>\n" .
			      "</item>\n";
		} elsif ($format eq 'atom') {
			print "</ul>\n</div>\n" .
			      "</content>\n" .
			      "</entry>\n";
		}
	}

	# end of feed
	if ($format eq 'rss') {
		print "</channel>\n</rss>\n";
	}	elsif ($format eq 'atom') {
		print "</feed>\n";
	}
}

sub git_rss {
	git_feed('rss');
}

sub git_atom {
	git_feed('atom');
}

sub git_opml {
	my @list = git_get_projects_list();

	print $cgi->header(-type => 'text/xml', -charset => 'utf-8');
	print <<XML;
<?xml version="1.0" encoding="utf-8"?>
<opml version="1.0">
<head>
  <title>$site_name OPML Export</title>
</head>
<body>
<outline text="git RSS feeds">
XML

	foreach my $pr (@list) {
		my %proj = %$pr;
		my $head = git_get_head_hash($proj{'path'});
		if (!defined $head) {
			next;
		}
		$git_dir = "$projectroot/$proj{'path'}";
		my %co = parse_commit($head);
		if (!%co) {
			next;
		}

		my $path = esc_html(chop_str($proj{'path'}, 25, 5));
		my $rss  = "$my_url?p=$proj{'path'};a=rss";
		my $html = "$my_url?p=$proj{'path'};a=summary";
		print "<outline type=\"rss\" text=\"$path\" title=\"$path\" xmlUrl=\"$rss\" htmlUrl=\"$html\"/>\n";
	}
	print <<XML;
</outline>
</body>
</opml>
XML
}