[Gitweb] / gitweb.perl

#!/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';

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++";

# 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;

# 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
        #
        # 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 tarball of any
        # tree. This can potentially generate high traffic if you have large
        # project.

        # To disable system wide have in $GITWEB_CONFIG
        # $feature{'snapshot'}{'default'} = [undef];
        # To have project specific config enable override in $GITWEB_CONFIG
        # $feature{'blame'}{'override'} = 1;
        # and in project config gitweb.snapshot = none|gzip|bzip2;
        'snapshot' => {
                'sub' => \&feature_snapshot,
                'override' => 0,
                #         => [content-encoding, suffix, program]
                'default' => ['x-gzip', 'gz', 'gzip']},

        # 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. This feature is supported only if project list
        # is taken from a directory, not file.

        # 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 ($ctype, $suffix, $command) = @_;

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

        if ($val eq 'gzip') {
                return ('x-gzip', 'gz', 'gzip');
        } elsif ($val eq 'bzip2') {
                return ('x-bzip2', 'bz2', 'bzip2');
        } elsif ($val eq 'none') {
                return ();
        }

        return ($ctype, $suffix, $command);
}

sub gitweb_have_snapshot {
        my ($ctype, $suffix, $command) = gitweb_check_feature('snapshot');
        my $have_snapshot = (defined $ctype && defined $suffix);

        return $have_snapshot;
}

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"));
}

# 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' (or '-C', '-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

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");
        }
}

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 $searchtext = $cgi->param('s');
if (defined $searchtext) {
        if ($searchtext =~ m/[^a-zA-Z0-9_\.\/\-\+\:\@ ]/) {
                die_error(undef, "Invalid search parameter");
        }
        $searchtext = quotemeta $searchtext;
}

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

# 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,
        # those below don't need $project
        "opml" => \&git_opml,
        "project_list" => \&git_project_list,
        "project_index" => \&git_project_index,
);

if (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",
        );
        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}) {
                        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;
}

# very thin wrapper for decode("utf8", $str, Encode::FB_DEFAULT);
sub to_utf8 {
        my $str = shift;
        return decode("utf8", $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);
        $str = escapeHTML($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);
        $str = escapeHTML($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 ($age < 60*60*2) {
                return "age0";
        } elsif ($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;
}

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

        if (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_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_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 beling 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]{40})/) {
                my $hash_text = $1;
                if (git_get_type($hash_text) eq "commit") {
                        my $link =
                                $cgi->a({-href => href(action=>"commit", hash=>$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\">" . 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 patch (diff) line (rather not to be used for diff headers)
sub format_diff_line {
        my $line = shift;
        my ($from, $to) = @_;
        my $char = substr($line, 0, 1);
        my $diff_class = "";

        chomp $line;

        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";
        }
        return "<div class=\"diff$diff_class\">" . esc_html($line, -nbsp=>1) . "</div>\n";
}

## ----------------------------------------------------------------------
## 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(), 'repo-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;

        #'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;
}

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

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

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

                File::Find::find({
                        follow_fast => 1, # follow symbolic links
                        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 $projects_list) {
                # read from file(url-encoded):
                # 'git%2Fgit.git Linus+Torvalds'
                # 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
                # 'linux%2Fhotplug%2Fudev.git Greg+Kroah-Hartman'
                open my ($fd), $projects_list or return;
                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;
                                }
                                my $sfx = substr($path, length($filter));
                                if ($sfx !~ /^\/.*\.git$/) {
                                        next;
                                }
                        }
                        if (check_export_ok("$projectroot/$path")) {
                                my $pr = {
                                        path => $path,
                                        owner => to_utf8($owner),
                                };
                                push @list, $pr
                        }
                }
                close $fd;
        }
        @list = sort {$a->{'path'} cmp $b->{'path'}} @list;
        return @list;
}

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

        return undef unless $project;

        # 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);
                        if ($pr eq $project) {
                                $owner = to_utf8($ow);
                                last;
                        }
                }
                close $fd;
        }
        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=%(refname) %(committer)',
             '--sort=-committerdate',
             'refs/heads') or return;
        my $most_recent = <$fd>;
        close $fd or return;
        if ($most_recent =~ / (\d+) [-+][01]\d\d\d$/) {
                my $timestamp = $1;
                my $age = time - $timestamp;
                return ($age, age_string($age));
        }
}

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 {
        my $commit_id = shift;
        my $commit_text = shift;

        my @commit_lines;
        my %co;

        if (defined $commit_text) {
                @commit_lines = @$commit_text;
        } else {
                local $/ = "\0";
                open my $fd, "-|", git_cmd(), "rev-list",
                        "--header", "--parents", "--max-count=1",
                        $commit_id, "--"
                        or return;
                @commit_lines = split '\n', <$fd>;
                close $fd or return;
                pop @commit_lines;
        }
        my $header = shift @commit_lines;
        if (!($header =~ m/^[0-9a-fA-F]{40}/)) {
                return;
        }
        ($co{'id'}, my @parents) = split ' ', $header;
        $co{'parents'} = \@parents;
        $co{'parent'} = $parents[0];
        while (my $line = shift @commit_lines) {
                last if $line eq "\n";
                if ($line =~ m/^tree ([0-9a-fA-F]{40})$/) {
                        $co{'tree'} = $1;
                } elsif ($line =~ m/^author (.*) ([0-9]+) (.*)$/) {
                        $co{'author'} = $1;
                        $co{'author_epoch'} = $2;
                        $co{'author_tz'} = $3;
                        if ($co{'author'} =~ m/^([^<]+) </) {
                                $co{'author_name'} = $1;
                        } 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'};
                        $co{'committer_name'} =~ s/ <.*//;
                }
        }
        if (!defined $co{'tree'}) {
                return;
        };

        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;
}

# 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($7);
                }
        }
        # 'c512b523472485aef4fff9e57b229d9d243c967f'
        elsif ($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;
}

## ......................................................................
## 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 .= " - $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);
        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"/>
<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 Atom feed" '.
                       'href="%s" type="application/atom+xml" />'."\n",
                       esc_param($project), href(action=>"atom"));
        } 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";
                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";
                }
                $cgi->param("a", "search");
                $cgi->param("h", $search_hash);
                $cgi->param("p", $project);
                print $cgi->startform(-method => "get", -action => $my_uri) .
                      "<div class=\"search\">\n" .
                      $cgi->hidden(-name => "p") . "\n" .
                      $cgi->hidden(-name => "a") . "\n" .
                      $cgi->hidden(-name => "h") . "\n" .
                      $cgi->popup_menu(-name => 'st', -default => 'commit',
                                       -values => ['commit', '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";
        }
        print "</div>\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'}, "[$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=>$hb),
                                      -title => esc_html($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=>$hb),
                                      -title => esc_html($name)}, esc_path($basename));
                } elsif (defined $type && $type eq 'tree') {
                        print $cgi->a({-href => href(action=>"tree", file_name=>$file_name,
                                                     hash_base=>$hb),
                                      -title => esc_html($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;
        }
}

# 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'})) . "</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";
        }
}

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

sub git_difftree_body {
        my ($difftree, $hash, $parent) = @_;
        my ($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=\"diff_tree\">\n";
        my $alternate = 1;
        my $patchno = 0;
        foreach my $line (@{$difftree}) {
                my %diff = parse_difftree_raw_line($line);

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

                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 != $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 "</table>\n";
}

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

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

        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;

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

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

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

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

                        push @diff_header, $patch_line;
                }
                #last PATCH unless $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 &&
                    $diffinfo->{'from_id'} eq $from_id &&
                    $diffinfo->{'to_id'}   eq $to_id) {
                        # this is split patch
                        print "<div class=\"patch cont\">\n";
                } else {
                        # advance raw git-diff output if needed
                        $patch_idx++ if defined $diffinfo;

                        # 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]);
                        }
                        $from{'file'} = $diffinfo->{'from_file'} || $diffinfo->{'file'};
                        $to{'file'}   = $diffinfo->{'to_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'});
                        }
                        if ($diffinfo->{'status'} ne "D") { # not deleted file
                                $to{'href'} = href(action=>"blob", hash_base=>$hash,
                                                   hash=>$diffinfo->{'to_id'},
                                                   file_name=>$to{'file'});
                        }
                        # 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;
                $patch_line =~ s!^(diff (.*?) )"?a/.*$!$1!;
                if ($from{'href'}) {
                        $patch_line .= $cgi->a({-href => $from{'href'}, -class => "path"},
                                               'a/' . esc_path($from{'file'}));
                } else { # file was added
                        $patch_line .= 'a/' . esc_path($from{'file'});
                }
                $patch_line .= ' ';
                if ($to{'href'}) {
                        $patch_line .= $cgi->a({-href => $to{'href'}, -class => "path"},
                                               'b/' . esc_path($to{'file'}));
                } else { # file was deleted
                        $patch_line .= 'b/' . esc_path($to{'file'});
                }
                print "<div class=\"diff header\">$patch_line</div>\n";

                # print extended diff header
                print "<div class=\"diff extended_header\">\n" if (@diff_header > 0);
        EXTENDED_HEADER:
                foreach $patch_line (@diff_header) {
                        # match <path>
                        if ($patch_line =~ s!^((copy|rename) from ).*$!$1! && $from{'href'}) {
                                $patch_line .= $cgi->a({-href=>$from{'href'}, -class=>"path"},
                                                        esc_path($from{'file'}));
                        }
                        if ($patch_line =~ s!^((copy|rename) to ).*$!$1! && $to{'href'}) {
                                $patch_line = $cgi->a({-href=>$to{'href'}, -class=>"path"},
                                                      esc_path($to{'file'}));
                        }
                        # match <mode>
                        if ($patch_line =~ m/\s(\d{6})$/) {
                                $patch_line .= '<span class="info"> (' .
                                               file_type_long($1) .
                                               ')</span>';
                        }
                        # match <hash>
                        if ($patch_line =~ m/^index/) {
                                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 {
                                        $to_link = '0' x 7;
                                }
                                #affirm {
                                #       my ($from_hash, $to_hash) =
                                #               ($patch_line =~ m/^index ([0-9a-fA-F]{40})..([0-9a-fA-F]{40})/);
                                #       my ($from_id, $to_id) =
                                #               ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
                                #       ($from_hash eq $from_id) && ($to_hash eq $to_id);
                                #} if DEBUG;
                                my ($from_id, $to_id) = ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
                                $patch_line =~ s!$from_id\.\.$to_id!$from_link..$to_link!;
                        }
                        print $patch_line . "<br/>\n";
                }
                print "</div>\n"  if (@diff_header > 0); # class="diff extended_header"

                # from-file/to-file diff header
                $patch_line = $last_patch_line;
                #assert($patch_line =~ m/^---/) if DEBUG;
                if ($from{'href'}) {
                        $patch_line = '--- a/' .
                                      $cgi->a({-href=>$from{'href'}, -class=>"path"},
                                              esc_path($from{'file'}));
                }
                print "<div class=\"diff from_file\">$patch_line</div>\n";

                $patch_line = <$fd>;
                #last PATCH unless $patch_line;
                chomp $patch_line;

                #assert($patch_line =~ m/^+++/) if DEBUG;
                if ($to{'href'}) {
                        $patch_line = '+++ b/' .
                                      $cgi->a({-href=>$to{'href'}, -class=>"path"},
                                              esc_path($to{'file'}));
                }
                print "<div class=\"diff to_file\">$patch_line</div>\n";

                # 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"
        }

        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'}) || "";
                        $pr->{'descr'} = chop_str($descr, 25, 5);
                }
                if (!defined $pr->{'owner'}) {
                        $pr->{'owner'} = get_file_owner("$projectroot/$pr->{'path'}") || "";
                }
                if ($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 ||= "project";
        $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($pr->{'path'})) . "</td>\n" .
                      "<td>" . esc_html($pr->{'descr'}) . "</td>\n" .
                      "<td><i>" . chop_str($pr->{'owner'}, 15) . "</i></td>\n";
                print "<td class=\"". age_class($pr->{'age'}) . "\">" .
                      $pr->{'age_string'} . "</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 $project
        my ($revlist, $from, $to, $refs, $extra) = @_;

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

        print "<table class=\"shortlog\" cellspacing=\"0\">\n";
        my $alternate = 1;
        for (my $i = $from; $i <= $to; $i++) {
                my $commit = $revlist->[$i];
                #my $ref = defined $refs ? format_ref_marker($refs, $commit) : '';
                my $ref = format_ref_marker($refs, $commit);
                my %co = parse_commit($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");
                if (gitweb_have_snapshot()) {
                        print " | " . $cgi->a({-href => href(action=>"snapshot", hash=>$commit)}, "snapshot");
                }
                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 ($revlist, $from, $to, $refs, $hash_base, $ftype, $extra) = @_;

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

        print "<table class=\"history\" cellspacing=\"0\">\n";
        my $alternate = 1;
        for (my $i = $from; $i <= $to; $i++) {
                if ($revlist->[$i] !~ m/^([0-9a-fA-F]{40})/) {
                        next;
                }

                my $commit = $1;
                my %co = parse_commit($commit);
                if (!%co) {
                        next;
                }

                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";
                }
                $alternate ^= 1;
                print "<td><i>$tag{'age'}</i></td>\n" .
                      "<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";
}

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

sub git_project_list {
        my $order = $cgi->param('o');
        if (defined $order && $order !~ m/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/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'}) {
                        $pr->{'owner'} = get_file_owner("$projectroot/$project");
                }

                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 $head = git_get_head_hash($project);
        my %co = parse_commit($head);
        my %cd = parse_date($co{'committer_epoch'}, $co{'committer_tz'});

        my $owner = git_get_project_owner($project);

        my $refs = git_get_references();
        my @taglist  = git_get_tags_list(15);
        my @headlist = git_get_heads_list(15);
        my @forklist;
        my ($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($descr) . "</td></tr>\n" .
              "<tr><td>owner</td><td>$owner</td></tr>\n" .
              "<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;
                }
        }

        open my $fd, "-|", git_cmd(), "rev-list", "--max-count=17",
                git_get_head_hash($project), "--"
                or die_error(undef, "Open git-rev-list failed");
        my @revlist = map { chomp; $_ } <$fd>;
        close $fd;
        git_print_header_div('shortlog');
        git_shortlog_body(\@revlist, 0, 15, $refs,
                          $cgi->a({-href => href(action=>"shortlog")}, "..."));

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

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

        if (@forklist) {
                git_print_header_div('forks');
                git_project_list_body(\@forklist, undef, 0, 15,
                                      $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($hash);
        git_print_header_div('commit', esc_html($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";
                }
                my $blamed = href(action => 'blame',
                                  file_name => $meta->{'filename'},
                                  hash_base => $full_rev);
                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\//) {
                close $fd;
                return git_blob_plain($mimetype);
        }
        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";
        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);
        }
        close $fd
                or print "Reading blob failed.\n";
        print "</div>";
        git_footer_html();
}

sub git_tree {
        my $have_snapshot = gitweb_have_snapshot();

        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"),
                }
                if ($have_snapshot) {
                        # FIXME: Should be available when we have no hash base as well.
                        push @views_nav,
                                $cgi->a({-href => href(action=>"snapshot", hash=>$hash)},
                                        "snapshot");
                }
                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 ($ctype, $suffix, $command) = gitweb_check_feature('snapshot');
        my $have_snapshot = (defined $ctype && defined $suffix);
        if (!$have_snapshot) {
                die_error('403 Permission denied', "Permission denied");
        }

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

        my $filename = basename($project) . "-$hash.tar.$suffix";

        print $cgi->header(
                -type => 'application/x-tar',
                -content_encoding => $ctype,
                -content_disposition => 'inline; filename="' . "$filename" . '"',
                -status => '200 OK');

        my $git = git_cmd_str();
        my $name = $project;
        $name =~ s/\047/\047\\\047\047/g;
        open my $fd, "-|",
        "$git archive --format=tar --prefix=\'$name\'/ $hash | $command"
                or die_error(undef, "Execute git-tar-tree failed.");
        binmode STDOUT, ':raw';
        print <$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 $limit = sprintf("--max-count=%i", (100 * ($page+1)));
        open my $fd, "-|", git_cmd(), "rev-list", $limit, $hash, "--"
                or die_error(undef, "Open git-rev-list failed");
        my @revlist = map { chomp; $_ } <$fd>;
        close $fd;

        my $paging_nav = format_paging_nav('log', $hash, $head, $page, $#revlist);

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

        if (!@revlist) {
                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";
        }
        for (my $i = ($page * 100); $i <= $#revlist; $i++) {
                my $commit = $revlist[$i];
                my $ref = format_ref_marker($refs, $commit);
                my %co = parse_commit($commit);
                next if !%co;
                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";
        }
        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'};
        if (!defined $parent) {
                $parent = "--root";
        }
        open my $fd, "-|", git_cmd(), "diff-tree", '-r', "--no-commit-id",
                @diff_opts, $parent, $hash, "--"
                or die_error(undef, "Open git-diff-tree failed");
        my @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'});

        my $have_snapshot = gitweb_have_snapshot();

        my @views_nav = ();
        if (defined $file_name && defined $co{'parent'}) {
                push @views_nav,
                        $cgi->a({-href => href(action=>"blame", hash_parent=>$parent, file_name=>$file_name)},
                                "blame");
        }
        git_header_html(undef, $expires);
        git_print_page_nav('commit', '',
                           $hash, $co{'tree'}, $hash,
                           join (' | ', @views_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=>$hash)},
                      "tree");
        if ($have_snapshot) {
                print " | " .
                      $cgi->a({-href => href(action=>"snapshot", hash=>$hash)}, "snapshot");
        }
        print "</td>" .
              "</tr>\n";
        my $parents = $co{'parents'};
        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, $parent);

        git_footer_html();
}

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,
                                "--", $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', $hash_parent_base, $hash_base,
                        "--", $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", '-p', @diff_opts,
                        $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");
        }

        # we need to prepare $formats_nav before 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) {
                        # 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: ' .
                                $cgi->a({-href => href(action=>"commitdiff",
                                                       hash=>$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
                        $formats_nav .=
                                ' (merge: ' .
                                join(' ', map {
                                        $cgi->a({-href => href(action=>"commitdiff",
                                                               hash=>$_)},
                                                esc_html(substr($_, 0, 7)));
                                } @{$co{'parents'}} ) .
                                ')';
                }
        }

        if (!defined $hash_parent) {
                $hash_parent = $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, $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, $line;
                }

        } elsif ($format eq 'plain') {
                open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
                        '-p', $hash_parent, $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') {
                git_difftree_body(\@difftree, $hash, $hash_parent);
                print "<br/>\n";

                git_patchset_body($fd, \@difftree, $hash, $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);
        }

        open my $fd, "-|",
                git_cmd(), "rev-list", $limit, "--full-history", $hash_base, "--", $file_name
                        or die_error(undef, "Open git-rev-list-failed");
        my @revlist = map { chomp; $_ } <$fd>;
        close $fd
                or die_error(undef, "Reading git-rev-list failed");

        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";
                $paging_nav .= " &sdot; prev";
        }
        if ($#revlist >= (100 * ($page+1)-1)) {
                $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 $next_link = '';
        if ($#revlist >= (100 * ($page+1)-1)) {
                $next_link =
                        $cgi->a({-href => href(action=>"history", hash=>$hash, hash_base=>$hash_base,
                                               file_name=>$file_name, page=>$page+1),
                                 -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(\@revlist, ($page * 100), $#revlist,
                         $refs, $hash_base, $ftype, $next_link);

        git_footer_html();
}

sub git_search {
        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");
        }

        $searchtype ||= 'commit';
        if ($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");
                }
        }

        git_header_html();
        git_print_page_nav('','', $hash,$co{'tree'},$hash);
        git_print_header_div('commit', esc_html($co{'title'}), $hash);

        print "<table cellspacing=\"0\">\n";
        my $alternate = 1;
        if ($searchtype eq 'commit' or $searchtype eq 'author' or $searchtype eq 'committer') {
                $/ = "\0";
                open my $fd, "-|", git_cmd(), "rev-list",
                        "--header", "--parents", $hash, "--"
                        or next;
                while (my $commit_text = <$fd>) {
                        if (!grep m/$searchtext/i, $commit_text) {
                                next;
                        }
                        if ($searchtype eq 'author' && !grep m/\nauthor .*$searchtext/i, $commit_text) {
                                next;
                        }
                        if ($searchtype eq 'committer' && !grep m/\ncommitter .*$searchtext/i, $commit_text) {
                                next;
                        }
                        my @commit_lines = split "\n", $commit_text;
                        my %co = parse_commit(undef, \@commit_lines);
                        if (!%co) {
                                next;
                        }
                        if ($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 ($line =~ m/^(.*)($searchtext)(.*)$/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";
                }
                close $fd;
        }

        if ($searchtype eq 'pickaxe') {
                $/ = "\n";
                my $git_command = git_cmd_str();
                open my $fd, "-|", "$git_command rev-list $hash | " .
                        "$git_command diff-tree -r --stdin -S\'$searchtext\'";
                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";
        git_footer_html();
}

sub git_search_help {
        git_header_html();
        git_print_page_nav('','', $hash,$hash,$hash);
        print <<EOT;
<dl>
<dt><b>commit</b></dt>
<dd>The commit messages and authorship information will be scanned for the given string.</dd>
<dt><b>author</b></dt>
<dd>Name and e-mail of the change author and date of birth of the patch will be scanned for the given string.</dd>
<dt><b>committer</b></dt>
<dd>Name and e-mail of the committer and date of commit will be scanned for the given string.</dd>
EOT
        my ($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 $limit = sprintf("--max-count=%i", (100 * ($page+1)));
        open my $fd, "-|", git_cmd(), "rev-list", $limit, $hash, "--"
                or die_error(undef, "Open git-rev-list failed");
        my @revlist = map { chomp; $_ } <$fd>;
        close $fd;

        my $paging_nav = format_paging_nav('shortlog', $hash, $head, $page, $#revlist);
        my $next_link = '';
        if ($#revlist >= (100 * ($page+1)-1)) {
                $next_link =
                        $cgi->a({-href => href(action=>"shortlog", hash=>$hash, page=>$page+1),
                                 -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(\@revlist, ($page * 100), $#revlist, $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';
        open my $fd, "-|", git_cmd(), "rev-list", "--max-count=150",
                $head, "--", (defined $file_name ? $file_name : ())
                or die_error(undef, "Open git-rev-list failed");
        my @revlist = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading git-rev-list failed");

        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
                $content_type = 'text/xml';
        }
        if (defined($revlist[0])) {
                %latest_commit = parse_commit($revlist[0]);
                %latest_date   = parse_date($latest_commit{'committer_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_url) . "</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 <= $#revlist; $i++) {
                my $commit = $revlist[$i];
                my %co = parse_commit($commit);
                # we read 150, we always show 30 and the ones more recent than 48 hours
                if (($i >= 20) && ((time - $co{'committer_epoch'}) > 48*60*60)) {
                        last;
                }
                my %cd = parse_date($co{'committer_epoch'});

                # get list of changed files
                open $fd, "-|", git_cmd(), "diff-tree", '-r', @diff_opts,
                        $co{'parent'}, $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><name>" . esc_html($co{'author_name'}) . "</name></author>\n" .
                              # use committer for contributor
                              "<contributor><name>" . esc_html($co{'committer_name'}) . "</name></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
}