#!/usr/bin/perl

# gitweb - simple web interface to track changes in git repositories
#
# (C) 2005, Kay Sievers <kay.sievers@vrfy.org>
# (C) 2005, Christian Gierke <ch@gierke.de>
#
# This program is licensed under the GPL v2, or a later version

use strict;
use warnings;
use CGI qw(:standard :escapeHTML -nosticky);
use CGI::Util qw(unescape);
use CGI::Carp qw(fatalsToBrowser);
use Fcntl ':mode';

my $cgi = new CGI;
my $version =           "234";
my $my_url =            $cgi->url();
my $my_uri =            $cgi->url(-absolute => 1);
my $rss_link = "";

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

# location of the git-core binaries
my $gitbin =            "/usr/bin";

# location for temporary files needed for diffs
my $git_temp =          "/tmp/gitweb";

# target of the home link on top of all pages
my $home_link =         $my_uri;

# html text to include at home page
my $home_text =         "indextext.html";

# source of projects list
#my $projects_list = $projectroot;
my $projects_list = "index/index.aux";

# input validation and dispatch
my $action = $cgi->param('a');
if (defined $action) {
        if ($action =~ m/[^0-9a-zA-Z\.\-_]+/) {
                undef $action;
                die_error(undef, "Invalid action parameter.");
        }
        if ($action eq "git-logo.png") {
                git_logo();
                exit;
        } elsif ($action eq "opml") {
                git_opml();
                exit;
        }
}

my $project = $cgi->param('p');
if (defined $project) {
        if ($project =~ m/(^|\/)(|\.|\.\.)($|\/)/) {
                undef $project;
                die_error(undef, "Non-canonical project parameter.");
        }
        if ($project =~ m/[^a-zA-Z0-9_\.\/\-\+\#\~]/) {
                undef $project;
                die_error(undef, "Invalid character in project parameter.");
        }
        if (!(-d "$projectroot/$project")) {
                undef $project;
                die_error(undef, "No such directory.");
        }
        if (!(-e "$projectroot/$project/HEAD")) {
                undef $project;
                die_error(undef, "No such project.");
        }
        $rss_link = "<link rel=\"alternate\" title=\"$project log\" href=\"$my_uri?p=$project;a=rss\" type=\"application/rss+xml\"/>";
        $ENV{'GIT_DIR'} = "$projectroot/$project";
} else {
        git_project_list();
        exit;
}

my $file_name = $cgi->param('f');
if (defined $file_name) {
        if ($file_name =~ m/(^|\/)(|\.|\.\.)($|\/)/) {
                undef $file_name;
                die_error(undef, "Non-canonical file parameter.");
        }
        if ($file_name =~ m/[^a-zA-Z0-9_\.\/\-\+\#\~\:\!]/) {
                undef $file_name;
                die_error(undef, "Invalid character in file parameter.");
        }
}

my $hash = $cgi->param('h');
if (defined $hash) {
        if (!($hash =~ m/^[0-9a-fA-F]{40}$/)) {
                if ($hash =~ m/(^|\/)(|\.|\.\.)($|\/)/) {
                        undef $hash;
                        die_error(undef, "Non-canonical hash parameter.");
                }
                if ($hash =~ m/[^a-zA-Z0-9_\.\/\-\+\#\~\:\!]/) {
                        undef $hash;
                        die_error(undef, "Invalid character in hash parameter.");
                }
                # replace branch-name with hash
                my $branchlist = git_read_refs("refs/heads");
                foreach my $entry (@$branchlist) {
                        my %branch = %$entry;
                        if ($branch{'name'} eq $hash) {
                                $hash = $branch{'id'};
                                last;
                        }
                }
        }
}

my $hash_parent = $cgi->param('hp');
if (defined $hash_parent && !($hash_parent =~ m/^[0-9a-fA-F]{40}$/)) {
        undef $hash_parent;
        die_error(undef, "Invalid hash_parent parameter.");
}

my $hash_base = $cgi->param('hb');
if (defined $hash_base && !($hash_base =~ m/^[0-9a-fA-F]{40}$/)) {
        undef $hash_base;
        die_error(undef, "Invalid parent hash parameter.");
}

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

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

if (!defined $action || $action eq "summary") {
        git_summary();
        exit;
} elsif ($action eq "branches") {
        git_branches();
        exit;
} elsif ($action eq "tags") {
        git_tags();
        exit;
} elsif ($action eq "blob") {
        git_blob();
        exit;
} elsif ($action eq "blob_plain") {
        git_blob_plain();
        exit;
} elsif ($action eq "tree") {
        git_tree();
        exit;
} elsif ($action eq "rss") {
        git_rss();
        exit;
} elsif ($action eq "commit") {
        git_commit();
        exit;
} elsif ($action eq "log") {
        git_log();
        exit;
} elsif ($action eq "blobdiff") {
        git_blobdiff();
        exit;
} elsif ($action eq "blobdiff_plain") {
        git_blobdiff_plain();
        exit;
} elsif ($action eq "commitdiff") {
        git_commitdiff();
        exit;
} elsif ($action eq "commitdiff_plain") {
        git_commitdiff_plain();
        exit;
} elsif ($action eq "history") {
        git_history();
        exit;
} elsif ($action eq "search") {
        git_search();
        exit;
} elsif ($action eq "shortlog") {
        git_shortlog();
        exit;
} else {
        undef $action;
        die_error(undef, "Unknown action.");
        exit;
}

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

        my $title = "git";
        if (defined $project) {
                $title .= " - $project";
                if (defined $action) {
                        $title .= "/$action";
                }
        }
        print $cgi->header(-type=>'text/html',  -charset => 'utf-8', -status=> $status);
        print <<EOF;
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
<!-- git web interface v$version, (C) 2005, Kay Sievers <kay.sievers\@vrfy.org>, Christian Gierke <ch\@gierke.de> -->
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<meta name="robots" content="index, nofollow"/>
<title>$title</title>
$rss_link
<style type="text/css">
body { font-family: sans-serif; font-size: 12px; margin:0px; border:solid #d9d8d1; border-width:1px; margin:10px; }
a { color:#0000cc; }
a:hover, a:visited, a:active { color:#880000; }
div.page_header { height:25px; padding:8px; font-size:18px; font-weight:bold; background-color:#d9d8d1; }
div.page_header a:visited { color:#0000cc; }
div.page_header a:hover { color:#880000; }
div.page_nav { padding:8px; }
div.page_nav a:visited { color:#0000cc; }
div.page_path { padding:8px; border:solid #d9d8d1; border-width:0px 0px 1px}
div.page_footer { height:17px; padding:4px 8px; background-color: #d9d8d1; }
div.page_footer_text { float:left; color:#555555; font-style:italic; }
div.page_body { padding:8px; }
div.title, a.title {
        display:block; padding:6px 8px;
        font-weight:bold; background-color:#edece6; text-decoration:none; color:#000000;
}
a.title:hover { background-color: #d9d8d1; }
div.title_text { padding:6px 0px; border: solid #d9d8d1; border-width:0px 0px 1px; }
div.log_body { padding:8px 8px 8px 150px; }
span.age { position:relative; float:left; width:142px; font-style:italic; }
div.log_link {
        padding:0px 8px;
        font-size:10px; font-family:sans-serif; font-style:normal;
        position:relative; float:left; width:136px;
}
div.list_head { padding:6px 8px 4px; border:solid #d9d8d1; border-width:1px 0px 0px; font-style:italic; }
a.list { text-decoration:none; color:#000000; }
a.list:hover { text-decoration:underline; color:#880000; }
table { padding:8px 4px; }
th { padding:2px 5px; font-size:12px; text-align:left; }
tr.light:hover { background-color:#edece6; }
tr.dark { background-color:#f6f6f0; }
tr.dark:hover { background-color:#edece6; }
td { padding:2px 5px; font-size:12px; vertical-align:top; }
td.link { padding:2px 5px; font-family:sans-serif; font-size:10px; }
div.pre { font-family:monospace; font-size:12px; white-space:pre; }
div.diff_info { font-family:monospace; color:#000099; background-color:#edece6; font-style:italic; }
div.index_include { border:solid #d9d8d1; border-width:0px 0px 1px; padding:12px 8px; }
div.search { margin:4px 8px; position:absolute; top:56px; right:12px }
a.linenr { color:#999999; text-decoration:none }
a.rss_logo {
        float:right; padding:3px 0px; width:35px; line-height:10px;
        border:1px solid; border-color:#fcc7a5 #7d3302 #3e1a01 #ff954e;
        color:#ffffff; background-color:#ff6600;
        font-weight:bold; font-family:sans-serif; font-size:10px;
        text-align:center; text-decoration:none;
}
a.rss_logo:hover { background-color:#ee5500; }
</style>
</head>
<body>
EOF
        print "<div class=\"page_header\">\n" .
              "<a href=\"http://www.kernel.org/pub/software/scm/git/docs/\" title=\"git documentation\">" .
              "<img src=\"$my_uri?a=git-logo.png\" width=\"72\" height=\"27\" alt=\"git\" style=\"float:right; border-width:0px;\"/>" .
              "</a>\n";
        print $cgi->a({-href => $home_link}, "projects") . " / ";
        if (defined $project) {
                print $cgi->a({-href => "$my_uri?p=$project;a=summary"}, escapeHTML($project));
                if (defined $action) {
                        print " / $action";
                }
                print "\n";
                if (!defined $searchtext) {
                        $searchtext = "";
                }
                $cgi->param("a", "search");
                print $cgi->startform(-method => "get", -action => "$my_uri") .
                      "<div class=\"search\">\n" .
                      $cgi->hidden(-name => "p") . "\n" .
                      $cgi->hidden(-name => "a") . "\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 $descr = git_read_description($project);
                if (defined $descr) {
                        print "<div class=\"page_footer_text\">" . escapeHTML($descr) . "</div>\n";
                }
                print $cgi->a({-href => "$my_uri?p=$project;a=rss", -class => "rss_logo"}, "RSS") . "\n";
        } else {
                print $cgi->a({-href => "$my_uri?a=opml", -class => "rss_logo"}, "RSS") . "\n";
        }
        print "</div>\n" .
              "</body>\n" .
              "</html>";
}

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

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

sub git_get_type {
        my $hash = shift;

        open my $fd, "-|", "$gitbin/git-cat-file -t $hash" or return;
        my $type = <$fd>;
        close $fd;
        chomp $type;
        return $type;
}

sub git_read_hash {
        my $path = shift;

        open my $fd, "$projectroot/$path" or return undef;
        my $head = <$fd>;
        close $fd;
        chomp $head;
        if ($head =~ m/^[0-9a-fA-F]{40}$/) {
                return $head;
        }
}

sub git_read_description {
        my $path = shift;

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

sub git_read_tag {
        my $tag_id = shift;
        my %tag;

        open my $fd, "-|", "$gitbin/git-cat-file tag $tag_id" or return;
        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;
                }
        }
        close $fd or return;
        if (!defined $tag{'name'}) {
                return
        };
        return %tag
}

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

        my @commit_lines;
        my %co;
        my @parents;

        if (defined $commit_text) {
                @commit_lines = @$commit_text;
        } else {
                open my $fd, "-|", "$gitbin/git-cat-file commit $commit_id" or return;
                @commit_lines = map { chomp; $_ } <$fd>;
                close $fd or return;
        }
        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/^parent ([0-9a-fA-F]{40})$/) {
                        push @parents, $1;
                } elsif ($line =~ m/^author (.*) ([0-9]+) (.*)$/) {
                        $co{'author'} = $1;
                        $co{'author_epoch'} = $2;
                        $co{'author_tz'} = $3;
                        if ($co{'author'} =~ m/^([^<]+) </) {
                                $co{'author_name'} = $1;
                        } 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 undef
        };
        $co{'id'} = $commit_id;
        $co{'parents'} = \@parents;
        $co{'parent'} = $parents[0];
        $co{'comment'} = \@commit_lines;
        foreach my $title (@commit_lines) {
                if ($title ne "") {
                        $co{'title'} = chop_str($title, 80);
                        # 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);
                        last;
                }
        }

        my $age = time - $co{'committer_epoch'};
        $co{'age'} = $age;
        if ($age > 60*60*24*365*2) {
                $co{'age_string'} = (int $age/60/60/24/365);
                $co{'age_string'} .= " years ago";
        } elsif ($age > 60*60*24*(365/12)*2) {
                $co{'age_string'} = int $age/60/60/24/(365/12);
                $co{'age_string'} .= " months ago";
        } elsif ($age > 60*60*24*7*2) {
                $co{'age_string'} = int $age/60/60/24/7;
                $co{'age_string'} .= " weeks ago";
        } elsif ($age > 60*60*24*2) {
                $co{'age_string'} = int $age/60/60/24;
                $co{'age_string'} .= " days ago";
        } elsif ($age > 60*60*2) {
                $co{'age_string'} = int $age/60/60;
                $co{'age_string'} .= " hours ago";
        } elsif ($age > 60*2) {
                $co{'age_string'} = int $age/60;
                $co{'age_string'} .= " min ago";
        } elsif ($age > 2) {
                $co{'age_string'} = int $age;
                $co{'age_string'} .= " sec ago";
        } else {
                $co{'age_string'} .= " right now";
        }
        my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($co{'committer_epoch'});
        if ($age > 60*60*24*7*2) {
                $co{'age_string_date'} = sprintf "%4i-%02u-%02i", 1900 + $year, $mon+1, $mday;
                $co{'age_string_age'} = $co{'age_string'};
        } else {
                $co{'age_string_date'} = $co{'age_string'};
                $co{'age_string_age'} = sprintf "%4i-%02u-%02i", 1900 + $year, $mon+1, $mday;
        }
        return %co;
}

sub git_diff_print {
        my $from = shift;
        my $from_name = shift;
        my $to = shift;
        my $to_name = shift;
        my $format = shift || "html";

        my $from_tmp = "/dev/null";
        my $to_tmp = "/dev/null";
        my $pid = $$;

        # create tmp from-file
        if (defined $from) {
                $from_tmp = "$git_temp/gitweb_" . $$ . "_from";
                open my $fd2, "> $from_tmp";
                open my $fd, "-|", "$gitbin/git-cat-file blob $from";
                my @file = <$fd>;
                print $fd2 @file;
                close $fd2;
                close $fd;
        }

        # create tmp to-file
        if (defined $to) {
                $to_tmp = "$git_temp/gitweb_" . $$ . "_to";
                open my $fd2, "> $to_tmp";
                open my $fd, "-|", "$gitbin/git-cat-file blob $to";
                my @file = <$fd>;
                print $fd2 @file;
                close $fd2;
                close $fd;
        }

        open my $fd, "-|", "/usr/bin/diff -u -p -L $from_name -L $to_name $from_tmp $to_tmp";
        if ($format eq "plain") {
                undef $/;
                print <$fd>;
                $/ = "\n";
        } else {
                while (my $line = <$fd>) {
                        chomp($line);
                        my $char = substr($line, 0, 1);
                        my $color = "";
                        if ($char eq '+') {
                                $color = " style=\"color:#008800;\"";
                        } elsif ($char eq "-") {
                                $color = " style=\"color:#cc0000;\"";
                        } elsif ($char eq "@") {
                                $color = " style=\"color:#990099;\"";
                        } elsif ($char eq "\\") {
                                # skip errors
                                next;
                        }
                        while ((my $pos = index($line, "\t")) != -1) {
                                if (my $count = (8 - (($pos-1) % 8))) {
                                        my $spaces = ' ' x $count;
                                        $line =~ s/\t/$spaces/;
                                }
                        }
                        print "<div class=\"pre\"$color>" . escapeHTML($line) . "</div>\n";
                }
        }
        close $fd;

        if (defined $from) {
                unlink($from_tmp);
        }
        if (defined $to) {
                unlink($to_tmp);
        }
}

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 '----------';
        }
}

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

        $str =~ m/^(.{0,$len}[^ \/\-_:\.@]{0,$add_len})/;
        my $chopped = $1;
        if ($chopped ne $str) {
                $chopped .= " ...";
        }
        return $chopped;
}

sub file_type {
        my $mode = oct shift;

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

sub format_log_line_html {
        my $line = shift;

        $line = escapeHTML($line);
        $line =~ s/ /&nbsp;/g;
        if ($line =~ m/([0-9a-fA-F]{40})/) {
                my $hash_text = $1;
                if (git_get_type($hash_text) eq "commit") {
                        my $link = $cgi->a({-class => "list", -href => "$my_uri?p=$project;a=commit;h=$hash_text"}, $hash_text);
                        $line =~ s/$hash_text/$link/;
                }
        }
        return $line;
}

sub date_str {
        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;

        $tz =~ m/^([+\-][0-9][0-9])([0-9][0-9])$/;
        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;
        return %date;
}

# git-logo (cached in browser for one day)
sub git_logo {
        print $cgi->header(-type => 'image/png', -expires => '+1d');
        # cat git-logo.png | hexdump -e '16/1 " %02x"  "\n"' | sed 's/ /\\x/g'
        print   "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a\x00\x00\x00\x0d\x49\x48\x44\x52" .
                "\x00\x00\x00\x48\x00\x00\x00\x1b\x04\x03\x00\x00\x00\x2d\xd9\xd4" .
                "\x2d\x00\x00\x00\x18\x50\x4c\x54\x45\xff\xff\xff\x60\x60\x5d\xb0" .
                "\xaf\xaa\x00\x80\x00\xce\xcd\xc7\xc0\x00\x00\xe8\xe8\xe6\xf7\xf7" .
                "\xf6\x95\x0c\xa7\x47\x00\x00\x00\x73\x49\x44\x41\x54\x28\xcf\x63" .
                "\x48\x67\x20\x04\x4a\x5c\x18\x0a\x08\x2a\x62\x53\x61\x20\x02\x08" .
                "\x0d\x69\x45\xac\xa1\xa1\x01\x30\x0c\x93\x60\x36\x26\x52\x91\xb1" .
                "\x01\x11\xd6\xe1\x55\x64\x6c\x6c\xcc\x6c\x6c\x0c\xa2\x0c\x70\x2a" .
                "\x62\x06\x2a\xc1\x62\x1d\xb3\x01\x02\x53\xa4\x08\xe8\x00\x03\x18" .
                "\x26\x56\x11\xd4\xe1\x20\x97\x1b\xe0\xb4\x0e\x35\x24\x71\x29\x82" .
                "\x99\x30\xb8\x93\x0a\x11\xb9\x45\x88\xc1\x8d\xa0\xa2\x44\x21\x06" .
                "\x27\x41\x82\x40\x85\xc1\x45\x89\x20\x70\x01\x00\xa4\x3d\x21\xc5" .
                "\x12\x1c\x9a\xfe\x00\x00\x00\x00\x49\x45\x4e\x44\xae\x42\x60\x82";
}

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 $owner;
}

sub git_read_projects {
        my @list;

        if (-d $projects_list) {
                # search in directory
                my $dir = $projects_list;
                opendir my $dh, $dir or return undef;
                while (my $dir = readdir($dh)) {
                        if (-e "$projectroot/$dir/HEAD") {
                                my $pr = {
                                        path => $dir,
                                };
                                push @list, $pr
                        }
                }
                closedir($dh);
        } 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 undef;
                while (my $line = <$fd>) {
                        chomp $line;
                        my ($path, $owner) = split ' ', $line;
                        $path = unescape($path);
                        $owner = unescape($owner);
                        if (!defined $path) {
                                next;
                        }
                        if (-e "$projectroot/$path/HEAD") {
                                my $pr = {
                                        path => $path,
                                        owner => $owner,
                                };
                                push @list, $pr
                        }
                }
                close $fd;
        }
        @list = sort {$a->{'path'} cmp $b->{'path'}} @list;
        return @list;
}

sub git_project_list {
        my @list = git_read_projects();
        if (!@list) {
                die_error(undef, "No project 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";
        }
        print "<table cellspacing=\"0\">\n" .
              "<tr>\n" .
              "<th>Project</th>\n" .
              "<th>Description</th>\n" .
              "<th>Owner</th>\n" .
              "<th>last change</th>\n" .
              "<th></th>\n" .
              "</tr>\n";
        my $alternate = 0;
        foreach my $pr (@list) {
                my %proj = %$pr;
                my $head = git_read_hash("$proj{'path'}/HEAD");
                if (!defined $head) {
                        next;
                }
                $ENV{'GIT_DIR'} = "$projectroot/$proj{'path'}";
                my %co = git_read_commit($head);
                if (!%co) {
                        next;
                }
                my $descr = git_read_description($proj{'path'}) || "";
                $descr = chop_str($descr, 25, 5);
                # get directory owner if not already specified
                if (!defined $proj{'owner'}) {
                        $proj{'owner'} = get_file_owner("$projectroot/$proj{'path'}") || "";
                }
                if ($alternate) {
                        print "<tr class=\"dark\">\n";
                } else {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
                print "<td>" . $cgi->a({-href => "$my_uri?p=$proj{'path'};a=summary", -class => "list"}, escapeHTML($proj{'path'})) . "</td>\n" .
                      "<td>$descr</td>\n" .
                      "<td><i>" . chop_str($proj{'owner'}, 15) . "</i></td>\n";
                my $colored_age;
                if ($co{'age'} < 60*60*2) {
                        $colored_age = "<span style =\"color: #009900;\"><b><i>$co{'age_string'}</i></b></span>";
                } elsif ($co{'age'} < 60*60*24*2) {
                        $colored_age = "<span style =\"color: #009900;\"><i>$co{'age_string'}</i></span>";
                } else {
                        $colored_age = "<i>$co{'age_string'}</i>";
                }
                print "<td>$colored_age</td>\n" .
                      "<td class=\"link\">" .
                      $cgi->a({-href => "$my_uri?p=$proj{'path'};a=summary"}, "summary") .
                      " | " . $cgi->a({-href => "$my_uri?p=$proj{'path'};a=shortlog"}, "shortlog") .
                      " | " . $cgi->a({-href => "$my_uri?p=$proj{'path'};a=log"}, "log") .
                      "</td>\n" .
                      "</tr>\n";
        }
        print "</table>\n";
        git_footer_html();
}

sub git_read_refs {
        my $ref_dir = shift;
        my @reflist;

        my @refs;
        opendir my $dh, "$projectroot/$project/$ref_dir";
        while (my $dir = readdir($dh)) {
                if ($dir =~ m/^\./) {
                        next;
                }
                if (-d "$projectroot/$project/$ref_dir/$dir") {
                        opendir my $dh2, "$projectroot/$project/$ref_dir/$dir";
                        my @subdirs = grep !m/^\./, readdir $dh2;
                        closedir($dh2);
                        foreach my $subdir (@subdirs) {
                                push @refs, "$dir/$subdir"
                        }
                        next;
                }
                push @refs, $dir;
        }
        closedir($dh);
        foreach my $ref_file (@refs) {
                my $ref_id = git_read_hash("$project/$ref_dir/$ref_file");
                my $type = git_get_type($ref_id) || next;
                my %ref_item;
                my %co;
                if ($type eq "tag") {
                        my %tag = git_read_tag($ref_id);
                        if ($tag{'type'} eq "commit") {
                                %co = git_read_commit($tag{'object'});
                        }
                        $ref_item{'type'} = $tag{'type'};
                        $ref_item{'name'} = $tag{'name'};
                        $ref_item{'id'} = $tag{'object'};
                } elsif ($type eq "commit"){
                        %co = git_read_commit($ref_id);
                        $ref_item{'type'} = "commit";
                        $ref_item{'name'} = $ref_file;
                        $ref_item{'title'} = $co{'title'};
                        $ref_item{'id'} = $ref_id;
                }
                $ref_item{'epoch'} = $co{'committer_epoch'} || 0;
                $ref_item{'age'} = $co{'age_string'} || "unknown";

                push @reflist, \%ref_item;
        }
        # sort tags by age
        @reflist = sort {$b->{'epoch'} <=> $a->{'epoch'}} @reflist;
        return \@reflist;
}

sub git_summary {
        my $descr = git_read_description($project) || "none";
        my $head = git_read_hash("$project/HEAD");
        my %co = git_read_commit($head);
        my %cd = date_str($co{'committer_epoch'}, $co{'committer_tz'});

        my $owner;
        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 = $ow;
                                last;
                        }
                }
                close $fd;
        }
        if (!defined $owner) {
                $owner = get_file_owner("$projectroot/$project");
        }

        git_header_html();
        print "<div class=\"page_nav\">\n" .
              "summary".
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$head"}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$head"}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree"}, "tree") .
              "<br/><br/>\n" .
              "</div>\n";
        print "<div class=\"title\">&nbsp;</div>\n";
        print "<table cellspacing=\"0\">\n" .
              "<tr><td>description</td><td>" . escapeHTML($descr) . "</td></tr>\n" .
              "<tr><td>owner</td><td>$owner</td></tr>\n" .
              "<tr><td>last change</td><td>$cd{'rfc2822'}</td></tr>\n" .
              "</table>\n";
        open my $fd, "-|", "$gitbin/git-rev-list --max-count=17 " . git_read_hash("$project/HEAD") or die_error(undef, "Open failed.");
        my (@revlist) = map { chomp; $_ } <$fd>;
        close $fd;
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=shortlog", -class => "title"}, "shortlog") .
              "</div>\n";
        my $i = 16;
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
        foreach my $commit (@revlist) {
                my %co = git_read_commit($commit);
                my %ad = date_str($co{'author_epoch'});
                if ($alternate) {
                        print "<tr class=\"dark\">\n";
                } else {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
                if ($i-- > 0) {
                        print "<td><i>$co{'age_string'}</i></td>\n" .
                              "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
                              "<td>" .
                              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "list"},
                              "<b>" . escapeHTML($co{'title_short'}) . "</b>") .
                              "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
                              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$commit"}, "commitdiff") .
                              "</td>\n" .
                              "</tr>";
                } else {
                        print "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "...") . "</td>\n" .
                        "</tr>";
                        last;
                }
        }
        print "</table\n>";

        my $taglist = git_read_refs("refs/tags");
        if (defined @$taglist) {
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=tags", -class => "title"}, "tags") .
                      "</div>\n";
                my $i = 16;
                print "<table cellspacing=\"0\">\n";
                my $alternate = 0;
                foreach my $entry (@$taglist) {
                        my %tag = %$entry;
                        if ($alternate) {
                                print "<tr class=\"dark\">\n";
                        } else {
                                print "<tr class=\"light\">\n";
                        }
                        $alternate ^= 1;
                        if ($i-- > 0) {
                                print "<td><i>$tag{'age'}</i></td>\n" .
                                      "<td>" .
                                      $cgi->a({-href => "$my_uri?p=$project;a=$tag{'type'};h=$tag{'id'}", -class => "list"}, "<b>" .
                                      escapeHTML($tag{'name'}) . "</b>") .
                                      "</td>\n" .
                                      "<td class=\"link\">" .
                                      $cgi->a({-href => "$my_uri?p=$project;a=$tag{'type'};h=$tag{'id'}"}, $tag{'type'});
                                if ($tag{'type'} eq "commit") {
                                      print " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'id'}"}, "shortlog") .
                                            " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$tag{'id'}"}, "log");
                                }
                                print "</td>\n" .
                                      "</tr>";
                        } else {
                                print "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=tags"}, "...") . "</td>\n" .
                                "</tr>";
                                last;
                        }
                }
                print "</table\n>";
        }

        my $branchlist = git_read_refs("refs/heads");
        if (defined @$branchlist) {
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=branches", -class => "title"}, "branches") .
                      "</div>\n";
                my $i = 16;
                print "<table cellspacing=\"0\">\n";
                my $alternate = 0;
                foreach my $entry (@$branchlist) {
                        my %tag = %$entry;
                        if ($alternate) {
                                print "<tr class=\"dark\">\n";
                        } else {
                                print "<tr class=\"light\">\n";
                        }
                        $alternate ^= 1;
                        if ($i-- > 0) {
                                print "<td><i>$tag{'age'}</i></td>\n" .
                                      "<td>" .
                                      $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}", -class => "list"},
                                      "<b>" . escapeHTML($tag{'name'}) . "</b>") .
                                      "</td>\n" .
                                      "<td class=\"link\">" .
                                      $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}"}, "shortlog") .
                                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$tag{'name'}"}, "log") .
                                      "</td>\n" .
                                      "</tr>";
                        } else {
                                print "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=branches"}, "...") . "</td>\n" .
                                "</tr>";
                                last;
                        }
                }
                print "</table\n>";
        }
        git_footer_html();
}

sub git_tags {
        my $head = git_read_hash("$project/HEAD");
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$head"}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$head"}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;hb=$head"}, "tree") . "<br/>\n" .
              "<br/>\n" .
              "</div>\n";
        my $taglist = git_read_refs("refs/tags");
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary", -class => "title"}, "&nbsp;") .
              "</div>\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
        if (defined @$taglist) {
                foreach my $entry (@$taglist) {
                        my %tag = %$entry;
                        if ($alternate) {
                                print "<tr class=\"dark\">\n";
                        } else {
                                print "<tr class=\"light\">\n";
                        }
                        $alternate ^= 1;
                        print "<td><i>$tag{'age'}</i></td>\n" .
                              "<td>" .
                              $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'id'}", -class => "list"},
                              "<b>" . escapeHTML($tag{'name'}) . "</b>") .
                              "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=$tag{'type'};h=$tag{'id'}"}, $tag{'type'});
                        if ($tag{'type'} eq "commit") {
                              print " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}"}, "shortlog") .
                                    " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$tag{'id'}"}, "log");
                        }
                        print "</td>\n" .
                              "</tr>";
                }
        }
        print "</table\n>";
        git_footer_html();
}

sub git_branches {
        my $head = git_read_hash("$project/HEAD");
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$head"}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$head"}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;hb=$head"}, "tree") . "<br/>\n" .
              "<br/>\n" .
              "</div>\n";
        my $taglist = git_read_refs("refs/heads");
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary", -class => "title"}, "&nbsp;") .
              "</div>\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
        if (defined @$taglist) {
                foreach my $entry (@$taglist) {
                        my %tag = %$entry;
                        if ($alternate) {
                                print "<tr class=\"dark\">\n";
                        } else {
                                print "<tr class=\"light\">\n";
                        }
                        $alternate ^= 1;
                        print "<td><i>$tag{'age'}</i></td>\n" .
                              "<td>" .
                              $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}", -class => "list"}, "<b>" . escapeHTML($tag{'name'}) . "</b>") .
                              "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$tag{'name'}"}, "shortlog") .
                              " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$tag{'name'}"}, "log") .
                              "</td>\n" .
                              "</tr>";
                }
        }
        print "</table\n>";
        git_footer_html();
}

sub git_get_hash_by_path {
        my $base = shift;
        my $path = shift || return undef;

        my $tree = $base;
        my @parts = split '/', $path;
        while (my $part = shift @parts) {
                open my $fd, "-|", "$gitbin/git-ls-tree $tree" or die_error(undef, "Open git-ls-tree failed.");
                my (@entries) = map { chomp; $_ } <$fd>;
                close $fd or return undef;
                foreach my $line (@entries) {
                        #'100644        blob    0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa        panic.c'
                        $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t(.+)$/;
                        my $t_mode = $1;
                        my $t_type = $2;
                        my $t_hash = $3;
                        my $t_name = $4;
                        if ($t_name eq $part) {
                                if (!(@parts)) {
                                        return $t_hash;
                                }
                                if ($t_type eq "tree") {
                                        $tree = $t_hash;
                                }
                                last;
                        }
                }
        }
}

sub git_blob {
        if (!defined $hash && defined $file_name) {
                my $base = $hash_base || git_read_hash("$project/HEAD");
                $hash = git_get_hash_by_path($base, $file_name, "blob");
        }
        open my $fd, "-|", "$gitbin/git-cat-file blob $hash" or die_error(undef, "Open failed.");
        my $base = $file_name || "";
        git_header_html();
        if (defined $hash_base && (my %co = git_read_commit($hash_base))) {
                print "<div class=\"page_nav\">\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base"}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash_base"}, "commitdiff") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash_base"}, "tree") . "<br/>\n";
                print $cgi->a({-href => "$my_uri?p=$project;a=blob_plain;h=$hash"}, "plain") . "<br/>\n" .
                      "</div>\n";
                print "<div>" .
                      $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base", -class => "title"}, escapeHTML($co{'title'})) .
                      "</div>\n";
        } else {
                print "<div class=\"page_nav\">\n" .
                      "<br/><br/></div>\n" .
                      "<div class=\"title\">$hash</div>\n";
        }
        if (defined $file_name) {
                print "<div class=\"page_path\"><b>$file_name</b></div>\n";
        }
        print "<div class=\"page_body\">\n";
        my $nr;
        while (my $line = <$fd>) {
                chomp $line;
                $nr++;
                while ((my $pos = index($line, "\t")) != -1) {
                        if (my $count = (8 - ($pos % 8))) {
                                my $spaces = ' ' x $count;
                                $line =~ s/\t/$spaces/;
                        }
                }
                printf "<div class=\"pre\"><a id=\"l%i\" href=\"#l%i\" class=\"linenr\">%4i</a> %s</div>\n", $nr, $nr, $nr, escapeHTML($line);
        }
        close $fd or print "Reading blob failed.\n";
        print "</div>";
        git_footer_html();
}

sub git_blob_plain {
        print $cgi->header(-type => "text/plain", -charset => 'utf-8');
        open my $fd, "-|", "$gitbin/git-cat-file blob $hash" or return;
        undef $/;
        print <$fd>;
        $/ = "\n";
        close $fd;
}

sub git_tree {
        if (!defined $hash) {
                $hash = git_read_hash("$project/HEAD");
                if (defined $file_name) {
                        my $base = $hash_base || git_read_hash("$project/HEAD");
                        $hash = git_get_hash_by_path($base, $file_name, "tree");
                }
                if (!defined $hash_base) {
                        $hash_base = git_read_hash("$project/HEAD");
                }
        }
        open my $fd, "-|", "$gitbin/git-ls-tree $hash" or die_error(undef, "Open git-ls-tree failed.");
        my (@entries) = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading tree failed.");

        git_header_html();
        my $base_key = "";
        my $file_key = "";
        my $base = "";
        if (defined $hash_base && (my %co = git_read_commit($hash_base))) {
                $base_key = ";hb=$hash_base";
                print "<div class=\"page_nav\">\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash_base"}, "shortlog") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash_base"}, "log") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base"}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash_base"}, "commitdiff") .
                      " | tree" .
                      "<br/><br/>\n" .
                      "</div>\n";
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
                      "</div>\n";
        } else {
                print "<div class=\"page_nav\">\n";
                print "<br/><br/></div>\n";
                print "<div class=\"title\">$hash</div>\n";
        }
        if (defined $file_name) {
                $base = "$file_name/";
                print "<div class=\"page_path\"><b>/$file_name</b></div>\n";
        } else {
                print "<div class=\"page_path\"><b>/</b></div>\n";
        }
        print "<div class=\"page_body\">\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
        foreach my $line (@entries) {
                #'100644        blob    0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa        panic.c'
                $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t(.+)$/;
                my $t_mode = $1;
                my $t_type = $2;
                my $t_hash = $3;
                my $t_name = $4;
                $file_key = ";f=$base$t_name";
                if ($alternate) {
                        print "<tr class=\"dark\">\n";
                } else {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
                print "<td style=\"font-family:monospace\">" . mode_str($t_mode) . "</td>\n";
                if ($t_type eq "blob") {
                        print "<td class=\"list\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$t_hash" . $base_key . $file_key, -class => "list"}, $t_name) .
                              "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$t_hash" . $base_key . $file_key}, "blob") .
                              " | " . $cgi->a({-href => "$my_uri?p=$project;a=history;h=$hash_base" . $file_key}, "history") .
                              "</td>\n";
                } elsif ($t_type eq "tree") {
                        print "<td class=\"list\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$t_hash" . $base_key . $file_key}, $t_name) .
                              "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$t_hash" . $base_key . $file_key}, "tree") .
                              "</td>\n";
                }
                print "</tr>\n";
        }
        print "</table>\n" .
              "</div>";
        git_footer_html();
}

sub git_rss {
        # http://www.notestips.com/80256B3A007F2692/1/NAMO5P9UPQ
        open my $fd, "-|", "$gitbin/git-rev-list --max-count=20 " . git_read_hash("$project/HEAD") or die_error(undef, "Open failed.");
        my (@revlist) = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading rev-list failed.");

        print $cgi->header(-type => 'text/xml', -charset => 'utf-8');
        print "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n".
              "<rss version=\"2.0\" xmlns:content=\"http://purl.org/rss/1.0/modules/content/\">\n";
        print "<channel>\n";
        print "<title>$project</title>\n".
              "<link>" . escapeHTML("$my_url?p=$project;a=summary") . "</link>\n".
              "<description>$project log</description>\n".
              "<language>en</language>\n";

        foreach my $commit (@revlist) {
                my %co = git_read_commit($commit);
                my %cd = date_str($co{'committer_epoch'});
                print "<item>\n" .
                      "<title>" .
                      sprintf("%d %s %02d:%02d", $cd{'mday'}, $cd{'month'}, $cd{'hour'}, $cd{'minute'}) . " - " . escapeHTML($co{'title'}) .
                      "</title>\n" .
                      "<pubDate>$cd{'rfc2822'}</pubDate>\n" .
                      "<link>" . escapeHTML("$my_url?p=$project;a=commit;h=$commit") . "</link>\n" .
                      "<description>" . escapeHTML($co{'title'}) . "</description>\n" .
                      "<content:encoded>" .
                      "<![CDATA[\n";
                my $comment = $co{'comment'};
                foreach my $line (@$comment) {
                        print "$line<br/>\n";
                }
                print "]]>\n" .
                      "</content:encoded>\n" .
                      "</item>\n";
        }
        print "</channel></rss>";
}

sub git_opml {
        my @list = git_read_projects();

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

        foreach my $pr (@list) {
                my %proj = %$pr;
                my $head = git_read_hash("$proj{'path'}/HEAD");
                if (!defined $head) {
                        next;
                }
                $ENV{'GIT_DIR'} = "$projectroot/$proj{'path'}";
                my %co = git_read_commit($head);
                if (!%co) {
                        next;
                }

                my $path = escapeHTML(chop_str($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 "</outline>\n".
              "</body>\n".
              "</opml>\n";
}

sub git_log {
        my $head = git_read_hash("$project/HEAD");
        if (!defined $hash) {
                $hash = $head;
        }
        if (!defined $page) {
                $page = 0;
        }
        git_header_html();
        print "<div class=\"page_nav\">\n";
        print $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash"}, "shortlog") .
              " | log" .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$hash;hb=$hash"}, "tree") . "<br/>\n";

        my $limit = sprintf("--max-count=%i", (100 * ($page+1)));
        open my $fd, "-|", "$gitbin/git-rev-list $limit $hash" or die_error(undef, "Open failed.");
        my (@revlist) = map { chomp; $_ } <$fd>;
        close $fd;

        if ($hash ne $head || $page) {
                print $cgi->a({-href => "$my_uri?p=$project;a=log"}, "HEAD");
        } else {
                print "HEAD";
        }
        if ($page > 0) {
                print " &sdot; " .
                $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash;pg=" . ($page-1), -accesskey => "p", -title => "Alt-p"}, "prev");
        } else {
                print " &sdot; prev";
        }
        if ($#revlist >= (100 * ($page+1)-1)) {
                print " &sdot; " .
                $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash;pg=" . ($page+1), -accesskey => "n", -title => "Alt-n"}, "next");
        } else {
                print " &sdot; next";
        }
        print "<br/>\n" .
              "</div>\n";
        if (!@revlist) {
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=summary", -class => "title"}, "&nbsp;") .
                      "</div>\n";
                my %co = git_read_commit($hash);
                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 %co = git_read_commit($commit);
                next if !%co;
                my %ad = date_str($co{'author_epoch'});
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "title"},
                      "<span class=\"age\">$co{'age_string'}</span>" . escapeHTML($co{'title'})) . "\n" .
                      "</div>\n";
                print "<div class=\"title_text\">\n" .
                      "<div class=\"log_link\">\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$commit"}, "commitdiff") .
                      "<br/>\n" .
                      "</div>\n" .
                      "<i>" . escapeHTML($co{'author_name'}) .  " [$ad{'rfc2822'}]</i><br/>\n" .
                      "</div>\n" .
                      "<div class=\"log_body\">\n";
                my $comment = $co{'comment'};
                my $empty = 0;
                foreach my $line (@$comment) {
                        if ($line =~ m/^ *(signed[ \-]off[ \-]by[ :]|acked[ \-]by[ :]|cc[ :])/i) {
                                next;
                        }
                        if ($line eq "") {
                                if ($empty) {
                                        next;
                                }
                                $empty = 1;
                        } else {
                                $empty = 0;
                        }
                        print format_log_line_html($line) . "<br/>\n";
                }
                if (!$empty) {
                        print "<br/>\n";
                }
                print "</div>\n";
        }
        git_footer_html();
}

sub git_commit {
        my %co = git_read_commit($hash);
        if (!%co) {
                die_error(undef, "Unknown commit object.");
        }
        my %ad = date_str($co{'author_epoch'}, $co{'author_tz'});
        my %cd = date_str($co{'committer_epoch'}, $co{'committer_tz'});

        my @difftree;
        my $root = "";
        if (!defined $co{'parent'}) {
                $root = " --root";
        }
        open my $fd, "-|", "$gitbin/git-diff-tree -r -M $root $co{'parent'} $hash" or die_error(undef, "Open failed.");
        @difftree = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading diff-tree failed.");
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash"}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash"}, "log") .
              " | commit";
        if (defined $co{'parent'}) {
                print " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff");
        }
        print " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") . "\n" .
              "<br/><br/></div>\n";
        if (defined $co{'parent'}) {
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
                      "</div>\n";
        } else {
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
                      "</div>\n";
        }
        print "<div class=\"title_text\">\n" .
              "<table cellspacing=\"0\">\n";
        print "<tr><td>author</td><td>" . escapeHTML($co{'author'}) . "</td></tr>\n".
              "<tr>" .
              "<td></td><td> $ad{'rfc2822'}";
        if ($ad{'hour_local'} < 6) {
                printf(" (<span style=\"color: #cc0000;\">%02d:%02d</span> %s)", $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'});
        } else {
                printf(" (%02d:%02d %s)", $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'});
        }
        print "</td>" .
              "</tr>\n";
        print "<tr><td>committer</td><td>" . escapeHTML($co{'committer'}) . "</td></tr>\n";
        print "<tr><td></td><td> $cd{'rfc2822'}" . sprintf(" (%02d:%02d %s)", $cd{'hour_local'}, $cd{'minute_local'}, $cd{'tz_local'}) . "</td></tr>\n";
        print "<tr><td>commit</td><td style=\"font-family:monospace\">$hash</td></tr>\n";
        print "<tr>" .
              "<td>tree</td>" .
              "<td style=\"font-family:monospace\">" .
              $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash", class => "list"}, $co{'tree'}) .
              "</td>" .
              "<td class=\"link\">" . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") .
              "</td>" .
              "</tr>\n";
        my $parents  = $co{'parents'};
        foreach my $par (@$parents) {
                print "<tr>" .
                      "<td>parent</td>" .
                      "<td style=\"font-family:monospace\">" . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$par", class => "list"}, $par) . "</td>" .
                      "<td class=\"link\">" .
                      $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$par"}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash;hp=$par"}, "commitdiff") .
                      "</td>" .
                      "</tr>\n";
        }
        print "</table>". 
              "</div>\n";
        print "<div class=\"page_body\">\n";
        my $comment = $co{'comment'};
        my $empty = 0;
        my $signed = 0;
        foreach my $line (@$comment) {
                # print only one empty line
                if ($line eq "") {
                        if ($empty || $signed) {
                                next;
                        }
                        $empty = 1;
                } else {
                        $empty = 0;
                }
                if ($line =~ m/^ *(signed[ \-]off[ \-]by[ :]|acked[ \-]by[ :]|cc[ :])/i) {
                        $signed = 1;
                        print "<span style=\"color: #888888\">" . escapeHTML($line) . "</span><br/>\n";
                } else {
                        $signed = 0;
                        print format_log_line_html($line) . "<br/>\n";
                }
        }
        print "</div>\n";
        print "<div class=\"list_head\">\n";
        if ($#difftree > 10) {
                print(($#difftree + 1) . " files changed:\n");
        }
        print "</div>\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
        foreach my $line (@difftree) {
                # ':100644 100644 03b218260e99b78c6df0ed378e59ed9205ccc96d 3b93d5e7cc7f7dd4ebed13a5cc1a4ad976fc94d8 M      ls-files.c'
                # ':100644 100644 7f9281985086971d3877aca27704f2aaf9c448ce bc190ebc71bbd923f2b728e505408f5e54bd073a M      rev-tree.c'
                $line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)([0-9]{0,3})\t(.*)$/;
                my $from_mode = $1;
                my $to_mode = $2;
                my $from_id = $3;
                my $to_id = $4;
                my $status = $5;
                my $similarity = $6;
                my $file = $7;
                #print "$line ($status)<br/>\n";
                if ($alternate) {
                        print "<tr class=\"dark\">\n";
                } else {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
                if ($status eq "A") {
                        my $mode_chng = "";
                        if (S_ISREG(oct $to_mode)) {
                                $mode_chng = sprintf(" with mode: %04o", (oct $to_mode) & 0777);
                        }
                        print "<td>" .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hp=$hash;f=$file", -class => "list"}, escapeHTML($file)) . "</td>\n" .
                              "<td><span style=\"color: #008000;\">[new " . file_type($to_mode) . "$mode_chng]</span></td>\n" .
                              "<td class=\"link\">" . $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"}, "blob") . "</td>\n";
                } elsif ($status eq "D") {
                        print "<td>" .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file", -class => "list"}, escapeHTML($file)) . "</td>\n" .
                              "<td><span style=\"color: #c00000;\">[deleted " . file_type($from_mode). "]</span></td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file"}, "blob") .
                              " | " . $cgi->a({-href => "$my_uri?p=$project;a=history;h=$hash;f=$file"}, "history") .
                              "</td>\n"
                } elsif ($status eq "M" || $status eq "T") {
                        my $mode_chnge = "";
                        if ($from_mode != $to_mode) {
                                $mode_chnge = " <span style=\"color: #777777;\">[changed";
                                if (((oct $from_mode) & S_IFMT) != ((oct $to_mode) & S_IFMT)) {
                                        $mode_chnge .= " from " . file_type($from_mode) . " to " . file_type($to_mode);
                                }
                                if (((oct $from_mode) & 0777) != ((oct $to_mode) & 0777)) {
                                        if (S_ISREG($from_mode) && S_ISREG($to_mode)) {
                                                $mode_chnge .= sprintf(" mode: %04o->%04o", (oct $from_mode) & 0777, (oct $to_mode) & 0777);
                                        } elsif (S_ISREG($to_mode)) {
                                                $mode_chnge .= sprintf(" mode: %04o", (oct $to_mode) & 0777);
                                        }
                                }
                                $mode_chnge .= "]</span>\n";
                        }
                        print "<td>";
                        if ($to_id ne $from_id) {
                                print $cgi->a({-href => "$my_uri?p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$file", -class => "list"}, escapeHTML($file));
                        } else {
                                print $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file", -class => "list"}, escapeHTML($file));
                        }
                        print "</td>\n" .
                              "<td>$mode_chnge</td>\n" .
                              "<td class=\"link\">";
                        print $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"}, "blob");
                        if ($to_id ne $from_id) {
                                print " | " . $cgi->a({-href => "$my_uri?p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$file"}, "diff");
                        }
                        print " | " . $cgi->a({-href => "$my_uri?p=$project;a=history;h=$hash;f=$file"}, "history") . "\n";
                        print "</td>\n";
                } elsif ($status eq "R") {
                        my ($from_file, $to_file) = split "\t", $file;
                        my $mode_chng = "";
                        if ($from_mode != $to_mode) {
                                $mode_chng = sprintf(", mode: %04o", (oct $to_mode) & 0777);
                        }
                        print "<td>" .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$to_file", -class => "list"}, escapeHTML($to_file)) . "</td>\n" .
                              "<td><span style=\"color: #777777;\">[moved from " .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$from_file", -class => "list"}, escapeHTML($from_file)) .
                              " with " . (int $similarity) . "% similarity$mode_chng]</span></td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$to_file"}, "blob");
                        if ($to_id ne $from_id) {
                                print " | " . $cgi->a({-href => "$my_uri?p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$to_file"}, "diff");
                        }
                        print "</td>\n";
                }
                print "</tr>\n";
        }
        print "</table>\n";
        git_footer_html();
}

sub git_blobdiff {
        mkdir($git_temp, 0700);
        git_header_html();
        if (defined $hash_base && (my %co = git_read_commit($hash_base))) {
                print "<div class=\"page_nav\">\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base"}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash_base"}, "commitdiff") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash_base"}, "tree") .
                      "<br/>\n";
                print $cgi->a({-href => "$my_uri?p=$project;a=blobdiff_plain;h=$hash;hp=$hash_parent"}, "plain") .
                      "</div>\n";
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash_base", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
                      "</div>\n";
        } else {
                print "<div class=\"page_nav\">\n" .
                      "<br/><br/></div>\n" .
                      "<div class=\"title\">$hash vs $hash_parent</div>\n";
        }
        if (defined $file_name) {
                print "<div class=\"page_path\"><b>/$file_name</b></div>\n";
        }
        print "<div class=\"page_body\">\n" .
              "<div class=\"diff_info\">blob:" .
              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$hash_parent;hb=$hash_base;f=$file_name"}, $hash_parent) .
              " -> blob:" .
              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$hash;hb=$hash_base;f=$file_name"}, $hash) .
              "</div>\n";
        git_diff_print($hash_parent, $file_name || $hash_parent, $hash, $file_name || $hash);
        print "</div>";
        git_footer_html();
}

sub git_blobdiff_plain {
        mkdir($git_temp, 0700);
        print $cgi->header(-type => "text/plain", -charset => 'utf-8');
        git_diff_print($hash_parent, $file_name || $hash_parent, $hash, $file_name || $hash, "plain");
}

sub git_commitdiff {
        mkdir($git_temp, 0700);
        my %co = git_read_commit($hash);
        if (!%co) {
                die_error(undef, "Unknown commit object.");
        }
        if (!defined $hash_parent) {
                $hash_parent = $co{'parent'};
        }
        open my $fd, "-|", "$gitbin/git-diff-tree -r $hash_parent $hash" or die_error(undef, "Open failed.");
        my (@difftree) = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading diff-tree failed.");

        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash"}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash"}, "log") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
              " | commitdiff" .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") . "<br/>\n";
        print $cgi->a({-href => "$my_uri?p=$project;a=commitdiff_plain;h=$hash;hp=$hash_parent"}, "plain") . "\n" .
              "</div>\n";
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
              "</div>\n";
        print "<div class=\"page_body\">\n";
        my $comment = $co{'comment'};
        my $empty = 0;
        my $signed = 0;
        my @log = @$comment;
        # remove first and empty lines after that
        shift @log;
        while (defined $log[0] && $log[0] eq "") {
                shift @log;
        }
        foreach my $line (@log) {
                if ($line =~ m/^ *(signed[ \-]off[ \-]by[ :]|acked[ \-]by[ :]|cc[ :])/i) {
                        next;
                }
                if ($line eq "") {
                        if ($empty) {
                                next;
                        }
                        $empty = 1;
                } else {
                        $empty = 0;
                }
                print format_log_line_html($line) . "<br/>\n";
        }
        print "<br/>\n";
        foreach my $line (@difftree) {
                # ':100644 100644 03b218260e99b78c6df0ed378e59ed9205ccc96d 3b93d5e7cc7f7dd4ebed13a5cc1a4ad976fc94d8 M      ls-files.c'
                # ':100644 100644 7f9281985086971d3877aca27704f2aaf9c448ce bc190ebc71bbd923f2b728e505408f5e54bd073a M      rev-tree.c'
                $line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)\t(.*)$/;
                my $from_mode = $1;
                my $to_mode = $2;
                my $from_id = $3;
                my $to_id = $4;
                my $status = $5;
                my $file = $6;
                if ($status eq "A") {
                        print "<div class=\"diff_info\">" .  file_type($to_mode) . ":" .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"}, $to_id) . "(new)" .
                              "</div>\n";
                        git_diff_print(undef, "/dev/null", $to_id, "b/$file");
                } elsif ($status eq "D") {
                        print "<div class=\"diff_info\">" . file_type($from_mode) . ":" .
                              $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file"}, $from_id) . "(deleted)" .
                              "</div>\n";
                        git_diff_print($from_id, "a/$file", undef, "/dev/null");
                } elsif ($status eq "M") {
                        if ($from_id ne $to_id) {
                                print "<div class=\"diff_info\">" .
                                      file_type($from_mode) . ":" . $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$from_id;hb=$hash;f=$file"}, $from_id) .
                                      " -> " .
                                      file_type($to_mode) . ":" . $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$to_id;hb=$hash;f=$file"}, $to_id);
                                print "</div>\n";
                                git_diff_print($from_id, "a/$file",  $to_id, "b/$file");
                        }
                }
        }
        print "<br/>\n" .
              "</div>";
        git_footer_html();
}

sub git_commitdiff_plain {
        mkdir($git_temp, 0700);
        open my $fd, "-|", "$gitbin/git-diff-tree -r $hash_parent $hash" or die_error(undef, "Open failed.");
        my (@difftree) = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading diff-tree failed.");

        # try to figure out the next tag after this commit
        my $tagname;
        my %taghash;
        my $tags = git_read_refs("refs/tags");
        foreach my $entry (@$tags) {
                my %tag = %$entry;
                $taghash{$tag{'id'}} = $tag{'name'};
        }
        open $fd, "-|", "$gitbin/git-rev-list HEAD";
        while (my $commit = <$fd>) {
                chomp $commit;
                if ($taghash{$commit}) {
                        $tagname = $taghash{$commit};
                }
                if ($commit eq $hash) {
                        last;
                }
        }
        close $fd;

        print $cgi->header(-type => "text/plain", -charset => 'utf-8');
        my %co = git_read_commit($hash);
        my %ad = date_str($co{'author_epoch'}, $co{'author_tz'});
        my $comment = $co{'comment'};
        print "From: $co{'author'}\n" .
              "Date: $ad{'rfc2822'} ($ad{'tz_local'})\n".
              "Subject: $co{'title'}\n";
        if (defined $tagname) {
              print "X-Git-Tag: $tagname\n";
        }
        print "X-Git-Url: $my_url?p=$project;a=commitdiff;h=$hash\n" .
              "\n";

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

        foreach my $line (@difftree) {
                $line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)\t(.*)$/;
                my $from_id = $3;
                my $to_id = $4;
                my $status = $5;
                my $file = $6;
                if ($status eq "A") {
                        git_diff_print(undef, "/dev/null", $to_id, "b/$file", "plain");
                } elsif ($status eq "D") {
                        git_diff_print($from_id, "a/$file", undef, "/dev/null", "plain");
                } elsif ($status eq "M") {
                        git_diff_print($from_id, "a/$file",  $to_id, "b/$file", "plain");
                }
        }
}

sub git_history {
        if (!defined $hash) {
                $hash = git_read_hash("$project/HEAD");
        }
        my %co = git_read_commit($hash);
        if (!%co) {
                die_error(undef, "Unknown commit object.");
        }
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=log"}, "log") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") .
              "<br/><br/>\n" .
              "</div>\n";
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
              "</div>\n";
        print "<div class=\"page_path\"><b>/$file_name</b><br/></div>\n";

        open my $fd, "-|", "$gitbin/git-rev-list $hash | $gitbin/git-diff-tree -r --stdin $file_name";
        my $commit;
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
        while (my $line = <$fd>) {
                if ($line =~ m/^([0-9a-fA-F]{40})/){
                        $commit = $1;
                        next;
                }
                if ($line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)\t(.*)$/ && (defined $commit)) {
                        my %co = git_read_commit($commit);
                        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>$co{'age_string_date'}</i></td>\n" .
                              "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 15, 3)) . "</i></td>\n" .
                              "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "list"}, "<b>" .
                              escapeHTML(chop_str($co{'title'}, 50)) . "</b>") . "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
                              " | " . $cgi->a({-href => "$my_uri?p=$project;a=blob;hb=$commit;f=$file_name"}, "blob");
                        my $blob = git_get_hash_by_path($hash, $file_name);
                        my $blob_parent = git_get_hash_by_path($commit, $file_name);
                        if (defined $blob && defined $blob_parent && $blob ne $blob_parent) {
                                print " | " .
                                $cgi->a({-href => "$my_uri?p=$project;a=blobdiff;h=$blob;hp=$blob_parent;hb=$commit;f=$file_name"},
                                "diff to current");
                        }
                        print "</td>\n" .
                              "</tr>\n";
                        undef $commit;
                }
        }
        print "</table>\n";
        close $fd;
        git_footer_html();
}

sub git_search {
        if (!defined $searchtext) {
                die_error("", "Text field empty.");
        }
        if (!defined $hash) {
                $hash = git_read_hash("$project/HEAD");
        }
        my %co = git_read_commit($hash);
        if (!%co) {
                die_error(undef, "Unknown commit object.");
        }
        # 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 $commit_search = 1;
        my $author_search = 0;
        my $committer_search = 0;
        my $pickaxe_search = 0;
        if ($searchtext =~ s/^author\\://i) {
                $author_search = 1;
        } elsif ($searchtext =~ s/^committer\\://i) {
                $committer_search = 1;
        } elsif ($searchtext =~ s/^pickaxe\\://i) {
                $commit_search = 0;
                $pickaxe_search = 1;
        }
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary;h=$hash"}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash"}, "log") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$hash"}, "tree") .
              "<br/><br/>\n" .
              "</div>\n";

        print "<div>\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash", -class => "title"}, escapeHTML($co{'title'})) . "\n" .
              "</div>\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
        if ($commit_search) {
                $/ = "\0";
                open my $fd, "-|", "$gitbin/git-rev-list --header $hash";
                while (my $commit_text = <$fd>) {
                        if (!grep m/$searchtext/i, $commit_text) {
                                next;
                        }
                        if ($author_search && !grep m/\nauthor .*$searchtext/i, $commit_text) {
                                next;
                        }
                        if ($committer_search && !grep m/\ncommitter .*$searchtext/i, $commit_text) {
                                next;
                        }
                        my @commit_lines = split "\n", $commit_text;
                        my $commit = shift @commit_lines;
                        my %co = git_read_commit($commit, \@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>$co{'age_string_date'}</i></td>\n" .
                              "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
                              "<td>" .
                              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "list"}, "<b>" . escapeHTML(chop_str($co{'title'}, 50)) . "</b><br/>");
                        my $comment = $co{'comment'};
                        foreach my $line (@$comment) {
                                if ($line =~ m/^(.*)($searchtext)(.*)$/i) {
                                        my $lead = escapeHTML($1) || "";
                                        $lead = chop_str($lead, 30, 10);
                                        my $match = escapeHTML($2) || "";
                                        my $trail = escapeHTML($3) || "";
                                        $trail = chop_str($trail, 30, 10);
                                        my $text = "$lead<span style=\"color:#e00000\">$match</span>$trail";
                                        print chop_str($text, 80, 5) . "<br/>\n";
                                }
                        }
                        print "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
                              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$commit"}, "tree");
                        print "</td>\n" .
                              "</tr>\n";
                }
                close $fd;
        }

        if ($pickaxe_search) {
                $/ = "\n";
                open my $fd, "-|", "$gitbin/git-rev-list $hash | $gitbin/git-diff-tree -r --stdin -S$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>$co{'age_string_date'}</i></td>\n" .
                                              "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
                                              "<td>" .
                                              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$co{'id'}", -class => "list"}, "<b>" .
                                              escapeHTML(chop_str($co{'title'}, 50)) . "</b><br/>");
                                        while (my $setref = shift @files) {
                                                my %set = %$setref;
                                                print $cgi->a({-href => "$my_uri?p=$project;a=blob;h=$set{'id'};hb=$co{'id'};f=$set{'file'}", class => "list"},
                                                      "<span style=\"color:#e00000\">" . escapeHTML($set{'file'}) . "</span>") .
                                                      "<br/>\n";
                                        }
                                        print "</td>\n" .
                                              "<td class=\"link\">" .
                                              $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$co{'id'}"}, "commit") .
                                              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$co{'tree'};hb=$co{'id'}"}, "tree");
                                        print "</td>\n" .
                                              "</tr>\n";
                                }
                                %co = git_read_commit($1);
                        }
                }
                close $fd;
        }
        print "</table>\n";
        git_footer_html();
}

sub git_shortlog {
        my $head = git_read_hash("$project/HEAD");
        if (!defined $hash) {
                $hash = $head;
        }
        if (!defined $page) {
                $page = 0;
        }
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary"}, "summary") .
              " | shortlog" .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=log;h=$hash"}, "log") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$hash"}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$hash"}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?p=$project;a=tree;h=$hash;hb=$hash"}, "tree") . "<br/>\n";

        my $limit = sprintf("--max-count=%i", (100 * ($page+1)));
        open my $fd, "-|", "$gitbin/git-rev-list $limit $hash" or die_error(undef, "Open failed.");
        my (@revlist) = map { chomp; $_ } <$fd>;
        close $fd;

        if ($hash ne $head || $page) {
                print $cgi->a({-href => "$my_uri?p=$project;a=shortlog"}, "HEAD");
        } else {
                print "HEAD";
        }
        if ($page > 0) {
                print " &sdot; " .
                $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash;pg=" . ($page-1), -accesskey => "p", -title => "Alt-p"}, "prev");
        } else {
                print " &sdot; prev";
        }
        if ($#revlist >= (100 * ($page+1)-1)) {
                print " &sdot; " .
                $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash;pg=" . ($page+1), -accesskey => "n", -title => "Alt-n"}, "next");
        } else {
                print " &sdot; next";
        }
        print "<br/>\n" .
              "</div>\n";
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?p=$project;a=summary", -class => "title"}, "&nbsp;") .
              "</div>\n";
        print "<table cellspacing=\"0\">\n";
        my $alternate = 0;
        for (my $i = ($page * 100); $i <= $#revlist; $i++) {
                my $commit = $revlist[$i];
                my %co = git_read_commit($commit);
                my %ad = date_str($co{'author_epoch'});
                if ($alternate) {
                        print "<tr class=\"dark\">\n";
                } else {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
                print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
                      "<td><i>" . escapeHTML(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
                      "<td>" . $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit", -class => "list"}, "<b>" .
                      escapeHTML($co{'title_short'}) . "</b>") . "</td>\n" .
                      "<td class=\"link\">" .
                      $cgi->a({-href => "$my_uri?p=$project;a=commit;h=$commit"}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?p=$project;a=commitdiff;h=$commit"}, "commitdiff") .
                      "</td>\n" .
                      "</tr>";
        }
        if ($#revlist >= (100 * ($page+1)-1)) {
                print "<tr>\n" .
                      "<td>" .
                      $cgi->a({-href => "$my_uri?p=$project;a=shortlog;h=$hash;pg=" . ($page+1), -title => "Alt-n"}, "next") .
                      "</td>\n" .
                      "</tr>\n";
        }
        print "</table\n>";
        git_footer_html();
}