#!/usr/bin/perl

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

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

my $cgi = new CGI;
my $version =           "267";
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";
my $projectroot =       "/home/kay/public_html/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";

# URI of default stylesheet
my $stylesheet =        "gitweb.css";

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

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

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


# 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 $order = $cgi->param('o');
if (defined $order) {
        if ($order =~ m/[^0-9a-zA-Z_]/) {
                undef $order;
                die_error(undef, "Invalid order parameter.");
        }
}

my $project = $cgi->param('p');
if (defined $project) {
        $project = validate_input($project);
        if (!defined($project)) {
                die_error(undef, "Invalid project parameter.");
        }
        if (!(-d "$projectroot/$project")) {
                undef $project;
                die_error(undef, "No such directory.");
        }
        if (!(-e "$projectroot/$project/HEAD")) {
                undef $project;
                die_error(undef, "No such project.");
        }
        $rss_link = "<link rel=\"alternate\" title=\"" . esc_param($project) . " log\" href=\"" .
                    "$my_uri?" . esc_param("p=$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) {
        $file_name = validate_input($file_name);
        if (!defined($file_name)) {
                die_error(undef, "Invalid file parameter.");
        }
}

my $hash = $cgi->param('h');
if (defined $hash) {
        $hash = validate_input($hash);
        if (!defined($hash)) {
                die_error(undef, "Invalid hash parameter.");
        }
}

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

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

sub validate_input {
        my $input = shift;

        if ($input =~ m/^[0-9a-fA-F]{40}$/) {
                return $input;
        }
        if ($input =~ m/(^|\/)(|\.|\.\.)($|\/)/) {
                return undef;
        }
        if ($input =~ m/[^a-zA-Z0-9_\x80-\xff\ \t\.\/\-\+\#\~\%]/) {
                return undef;
        }
        return $input;
}

if (!defined $action || $action eq "summary") {
        git_summary();
        exit;
} elsif ($action eq "heads") {
        git_heads();
        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;
} elsif ($action eq "tag") {
        git_tag();
        exit;
} elsif ($action eq "blame") {
        git_blame();
        exit;
} else {
        undef $action;
        die_error(undef, "Unknown action.");
        exit;
}

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

# replace invalid utf8 character with SUBSTITUTION sequence
sub esc_html {
        my $str = shift;
        $str = decode("utf8", $str, Encode::FB_DEFAULT);
        $str = escapeHTML($str);
        return $str;
}

# git may return quoted and escaped filenames
sub unquote {
        my $str = shift;
        if ($str =~ m/^"(.*)"$/) {
                $str = $1;
                $str =~ s/\\([0-7]{1,3})/chr(oct($1))/eg;
        }
        return $str;
}

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

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

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

        my $title = "git";
        if (defined $project) {
                $title .= " - $project";
                if (defined $action) {
                        $title .= "/$action";
                        if (defined $file_name) {
                                $title .= " - $file_name";
                                if ($action eq "tree" && $file_name !~ m|/$|) {
                                        $title .= "/";
                                }
                        }
                }
        }
        print $cgi->header(-type=>'text/html',  -charset => 'utf-8', -status=> $status, -expires => $expires);
        print <<EOF;
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
<!-- git web interface v$version, (C) 2005-2006, Kay Sievers <kay.sievers\@vrfy.org>, Christian Gierke -->
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<meta name="robots" content="index, nofollow"/>
<link rel="stylesheet" type="text/css" href="$stylesheet"/>
<title>$title</title>
$rss_link
</head>
<body>
EOF
        print "<div class=\"page_header\">\n" .
              "<a href=\"http://www.kernel.org/pub/software/scm/git/docs/\" title=\"git documentation\">" .
              "<img src=\"$my_uri?" . esc_param("a=git-logo.png") . "\" width=\"72\" height=\"27\" alt=\"git\" style=\"float:right; border-width:0px;\"/>" .
              "</a>\n";
        print $cgi->a({-href => esc_param($home_link)}, "projects") . " / ";
        if (defined $project) {
                print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, esc_html($project));
                if (defined $action) {
                        print " / $action";
                }
                print "\n";
                if (!defined $searchtext) {
                        $searchtext = "";
                }
                my $search_hash;
                if (defined $hash) {
                        $search_hash = $hash;
                } else {
                        $search_hash  = "HEAD";
                }
                $cgi->param("a", "search");
                $cgi->param("h", $search_hash);
                print $cgi->startform(-method => "get", -action => $my_uri) .
                      "<div class=\"search\">\n" .
                      $cgi->hidden(-name => "p") . "\n" .
                      $cgi->hidden(-name => "a") . "\n" .
                      $cgi->hidden(-name => "h") . "\n" .
                      $cgi->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 $descr) {
                        print "<div class=\"page_footer_text\">" . esc_html($descr) . "</div>\n";
                }
                print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=rss"), -class => "rss_logo"}, "RSS") . "\n";
        } else {
                print $cgi->a({-href => "$my_uri?" . esc_param("a=opml"), -class => "rss_logo"}, "OPML") . "\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 or return;
        chomp $type;
        return $type;
}

sub git_read_head {
        my $project = shift;
        my $oENV = $ENV{'GIT_DIR'};
        my $retval = undef;
        $ENV{'GIT_DIR'} = "$projectroot/$project";
        if (open my $fd, "-|", "$gitbin/git-rev-parse", "--verify", "HEAD") {
                my $head = <$fd>;
                close $fd;
                if (defined $head && $head =~ /^([0-9a-fA-F]{40})$/) {
                        $retval = $1;
                }
        }
        if (defined $oENV) {
                $ENV{'GIT_DIR'} = $oENV;
        }
        return $retval;
}

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;
        my @comment;

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

sub age_string {
        my $age = shift;
        my $age_str;

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

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

        my @commit_lines;
        my %co;

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

        foreach my $title (@commit_lines) {
                $title =~ s/^    //;
                if ($title ne "") {
                        $co{'title'} = chop_str($title, 80, 5);
                        # remove leading stuff of merges to make the interesting part visible
                        if (length($title) > 50) {
                                $title =~ s/^Automatic //;
                                $title =~ s/^merge (of|with) /Merge ... /i;
                                if (length($title) > 50) {
                                        $title =~ s/(http|rsync):\/\///;
                                }
                                if (length($title) > 50) {
                                        $title =~ s/(master|www|rsync)\.//;
                                }
                                if (length($title) > 50) {
                                        $title =~ s/kernel.org:?//;
                                }
                                if (length($title) > 50) {
                                        $title =~ s/\/pub\/scm//;
                                }
                        }
                        $co{'title_short'} = chop_str($title, 50, 5);
                        last;
                }
        }
        # remove added spaces
        foreach my $line (@commit_lines) {
                $line =~ s/^    //;
        }
        $co{'comment'} = \@commit_lines;

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

sub 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 $diff_class = "";
                        if ($char eq '+') {
                                $diff_class = " add";
                        } elsif ($char eq "-") {
                                $diff_class = " rem";
                        } elsif ($char eq "@") {
                                $diff_class = " chunk_header";
                        } elsif ($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=\"diff$diff_class\">" . esc_html($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;

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

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;

        $line = esc_html($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 = $cgi->a({-class => "text", -href => "$my_uri?" . esc_param("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 {
        binmode STDOUT, ':raw';
        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 decode("utf8", $owner, Encode::FB_DEFAULT);
}

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 => decode("utf8", $owner, Encode::FB_DEFAULT),
                                };
                                push @list, $pr
                        }
                }
                close $fd;
        }
        @list = sort {$a->{'path'} cmp $b->{'path'}} @list;
        return @list;
}

sub git_get_project_config {
        my $key = shift;

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

        my $val = qx(git-repo-config --get gitweb.$key);
        return ($val);
}

sub git_get_project_config_bool {
        my $val = git_get_project_config (@_);
        if ($val and $val =~ m/true|yes|on/) {
                return (1);
        }
        return; # implicit false
}

sub git_project_list {
        my @list = git_read_projects();
        my @projects;
        if (!@list) {
                die_error(undef, "No project found.");
        }
        foreach my $pr (@list) {
                my $head = git_read_head($pr->{'path'});
                if (!defined $head) {
                        next;
                }
                $ENV{'GIT_DIR'} = "$projectroot/$pr->{'path'}";
                my %co = git_read_commit($head);
                if (!%co) {
                        next;
                }
                $pr->{'commit'} = \%co;
                if (!defined $pr->{'descr'}) {
                        my $descr = git_read_description($pr->{'path'}) || "";
                        $pr->{'descr'} = chop_str($descr, 25, 5);
                }
                if (!defined $pr->{'owner'}) {
                        $pr->{'owner'} = get_file_owner("$projectroot/$pr->{'path'}") || "";
                }
                push @projects, $pr;
        }
        git_header_html();
        if (-f $home_text) {
                print "<div class=\"index_include\">\n";
                open (my $fd, $home_text);
                print <$fd>;
                close $fd;
                print "</div>\n";
        }
        print "<table class=\"project_list\">\n" .
              "<tr>\n";
        if (!defined($order) || (defined($order) && ($order eq "project"))) {
                @projects = sort {$a->{'path'} cmp $b->{'path'}} @projects;
                print "<th>Project</th>\n";
        } else {
                print "<th>" . $cgi->a({-class => "header", -href => "$my_uri?" . esc_param("o=project")}, "Project") . "</th>\n";
        }
        if (defined($order) && ($order eq "descr")) {
                @projects = sort {$a->{'descr'} cmp $b->{'descr'}} @projects;
                print "<th>Description</th>\n";
        } else {
                print "<th>" . $cgi->a({-class => "header", -href => "$my_uri?" . esc_param("o=descr")}, "Description") . "</th>\n";
        }
        if (defined($order) && ($order eq "owner")) {
                @projects = sort {$a->{'owner'} cmp $b->{'owner'}} @projects;
                print "<th>Owner</th>\n";
        } else {
                print "<th>" . $cgi->a({-class => "header", -href => "$my_uri?" . esc_param("o=owner")}, "Owner") . "</th>\n";
        }
        if (defined($order) && ($order eq "age")) {
                @projects = sort {$a->{'commit'}{'age'} <=> $b->{'commit'}{'age'}} @projects;
                print "<th>Last Change</th>\n";
        } else {
                print "<th>" . $cgi->a({-class => "header", -href => "$my_uri?" . esc_param("o=age")}, "Last Change") . "</th>\n";
        }
        print "<th></th>\n" .
              "</tr>\n";
        my $alternate = 0;
        foreach my $pr (@projects) {
                if ($alternate) {
                        print "<tr class=\"dark\">\n";
                } else {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
                print "<td>" . $cgi->a({-href => "$my_uri?" . esc_param("p=$pr->{'path'};a=summary"), -class => "list"}, esc_html($pr->{'path'})) . "</td>\n" .
                      "<td>$pr->{'descr'}</td>\n" .
                      "<td><i>" . chop_str($pr->{'owner'}, 15) . "</i></td>\n";
                print "<td class=\"". age_class($pr->{'commit'}{'age'}) . "\">" . $pr->{'commit'}{'age_string'} . "</td>\n" .
                      "<td class=\"link\">" .
                      $cgi->a({-href => "$my_uri?" . esc_param("p=$pr->{'path'};a=summary")}, "summary") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$pr->{'path'};a=shortlog")}, "shortlog") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$pr->{'path'};a=log")}, "log") .
                      "</td>\n" .
                      "</tr>\n";
        }
        print "</table>\n";
        git_footer_html();
}

sub read_info_ref {
        my $type = shift || "";
        my %refs;
        # 5dc01c595e6c6ec9ccda4f6f69c131c0dd945f8c      refs/tags/v2.6.11
        # c39ae07f393806ccf406ef966e9a15afc43cc36a      refs/tags/v2.6.11^{}
        open my $fd, "$projectroot/$project/info/refs" or return;
        while (my $line = <$fd>) {
                chomp($line);
                if ($line =~ m/^([0-9a-fA-F]{40})\t.*$type\/([^\^]+)/) {
                        if (defined $refs{$1}) {
                                $refs{$1} .= " / $2";
                        } else {
                                $refs{$1} = $2;
                        }
                }
        }
        close $fd or return;
        return \%refs;
}

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

                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 $head = git_read_head($project);
        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 = decode("utf8", $ow, Encode::FB_DEFAULT);
                                last;
                        }
                }
                close $fd;
        }
        if (!defined $owner) {
                $owner = get_file_owner("$projectroot/$project");
        }

        my $refs = read_info_ref();
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              "summary".
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog")}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log")}, "log") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$head")}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$head")}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree")}, "tree") .
              "<br/><br/>\n" .
              "</div>\n";
        print "<div class=\"title\">&nbsp;</div>\n";
        print "<table cellspacing=\"0\">\n" .
              "<tr><td>description</td><td>" . esc_html($descr) . "</td></tr>\n" .
              "<tr><td>owner</td><td>$owner</td></tr>\n" .
              "<tr><td>last change</td><td>$cd{'rfc2822'}</td></tr>\n" .
              "</table>\n";
        open my $fd, "-|", "$gitbin/git-rev-list --max-count=17 " . git_read_head($project) or die_error(undef, "Open failed.");
        my (@revlist) = map { chomp; $_ } <$fd>;
        close $fd;
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("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) {
                        my $ref = "";
                        if (defined $refs->{$commit}) {
                                $ref = " <span class=\"tag\">" . esc_html($refs->{$commit}) . "</span>";
                        }
                        print "<td><i>$co{'age_string'}</i></td>\n" .
                              "<td><i>" . esc_html(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
                              "<td>";
                        if (length($co{'title_short'}) < length($co{'title'})) {
                                print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit"), -class => "list", -title => "$co{'title'}"},
                                      "<b>" . esc_html($co{'title_short'}) . "$ref</b>");
                        } else {
                                print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit"), -class => "list"},
                                      "<b>" . esc_html($co{'title'}) . "$ref</b>");
                        }
                        print "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit")}, "commit") .
                              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$commit")}, "commitdiff") .
                              "</td>\n" .
                              "</tr>";
                } else {
                        print "<td>" . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("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;
                        my $comment_lines = $tag{'comment'};
                        my $comment = shift @$comment_lines;
                        if (defined($comment)) {
                                $comment = chop_str($comment, 30, 5);
                        }
                        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?" . esc_param("p=$project;a=$tag{'reftype'};h=$tag{'refid'}"), -class => "list"},
                                      "<b>" . esc_html($tag{'name'}) . "</b>") .
                                      "</td>\n" .
                                      "<td>";
                                if (defined($comment)) {
                                      print $cgi->a({-class => "list", -href => "$my_uri?" . esc_param("p=$project;a=tag;h=$tag{'id'}")}, $comment);
                                }
                                print "</td>\n" .
                                      "<td class=\"link\">";
                                if ($tag{'type'} eq "tag") {
                                      print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tag;h=$tag{'id'}")}, "tag") . " | ";
                                }
                                print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=$tag{'reftype'};h=$tag{'refid'}")}, $tag{'reftype'});
                                if ($tag{'reftype'} eq "commit") {
                                      print " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog;h=$tag{'name'}")}, "shortlog") .
                                            " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log;h=$tag{'refid'}")}, "log");
                                }
                                print "</td>\n" .
                                      "</tr>";
                        } else {
                                print "<td>" . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tags")}, "...") . "</td>\n" .
                                "</tr>";
                                last;
                        }
                }
                print "</table\n>";
        }

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

sub git_tag {
        my $head = git_read_head($project);
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog")}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log")}, "log") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$head")}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$head")}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;hb=$head")}, "tree") . "<br/>\n" .
              "<br/>\n" .
              "</div>\n";
        my %tag = git_read_tag($hash);
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash"), -class => "title"}, esc_html($tag{'name'})) . "\n" .
              "</div>\n";
        print "<div class=\"title_text\">\n" .
              "<table cellspacing=\"0\">\n" .
              "<tr>\n" .
              "<td>object</td>\n" .
              "<td>" . $cgi->a({-class => "list", -href => "$my_uri?" . esc_param("p=$project;a=$tag{'type'};h=$tag{'object'}")}, $tag{'object'}) . "</td>\n" .
              "<td class=\"link\">" . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=$tag{'type'};h=$tag{'object'}")}, $tag{'type'}) . "</td>\n" .
              "</tr>\n";
        if (defined($tag{'author'})) {
                my %ad = date_str($tag{'epoch'}, $tag{'tz'});
                print "<tr><td>author</td><td>" . esc_html($tag{'author'}) . "</td></tr>\n";
                print "<tr><td></td><td>" . $ad{'rfc2822'} . sprintf(" (%02d:%02d %s)", $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'}) . "</td></tr>\n";
        }
        print "</table>\n\n" .
              "</div>\n";
        print "<div class=\"page_body\">";
        my $comment = $tag{'comment'};
        foreach my $line (@$comment) {
                print esc_html($line) . "<br/>\n";
        }
        print "</div>\n";
        git_footer_html();
}

sub git_blame {
        my $fd;
        die_error('403 Permission denied', "Permission denied.") if (!git_get_project_config_bool ('blame'));
        die_error('404 Not Found', "What file will it be, master?") if (!$file_name);
        $hash_base ||= git_read_head($project);
        die_error(undef, "Reading commit failed.") unless ($hash_base);
        my %co = git_read_commit($hash_base)
                or die_error(undef, "Reading commit failed.");
        if (!defined $hash) {
                $hash = git_get_hash_by_path($hash_base, $file_name, "blob")
                        or die_error(undef, "Error lookup file.");
        }
        open ($fd, "-|", "$gitbin/git-annotate", '-l', '-t', '-r', $file_name, $hash_base)
                or die_error(undef, "Open failed.");
        git_header_html();
        print "<div class=\"page_nav\">\n" .
                $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, "summary") .
                " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog")}, "shortlog") .
                " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log")}, "log") .
                " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash_base")}, "commit") .
                " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$hash_base")}, "commitdiff") .
                " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$co{'tree'};hb=$hash_base")}, "tree") . "<br/>\n";
        print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;h=$hash;hb=$hash_base;f=$file_name")}, "blob") .
                " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blame;f=$file_name")}, "head") . "<br/>\n";
        print "</div>\n".
                "<div>" .
                $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash_base"), -class => "title"}, esc_html($co{'title'})) .
                "</div>\n";
        print "<div class=\"page_path\"><b>" . esc_html($file_name) . "</b></div>\n";
        print "<div class=\"page_body\">\n";
        print <<HTML;
<table class="blame">
  <tr>
    <th>Commit</th>
    <th>Age</th>
    <th>Author</th>
    <th>Line</th>
    <th>Data</th>
  </tr>
HTML
        my @line_class = (qw(light dark));
        my $line_class_len = scalar (@line_class);
        my $line_class_num = $#line_class;
        while (my $line = <$fd>) {
                my $long_rev;
                my $short_rev;
                my $author;
                my $time;
                my $lineno;
                my $data;
                my $age;
                my $age_str;
                my $age_class;

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

                if ($line =~ m/^([0-9a-fA-F]{40})\t\(\s*([^\t]+)\t(\d+) \+\d\d\d\d\t(\d+)\)(.*)$/) {
                        $long_rev = $1;
                        $author   = $2;
                        $time     = $3;
                        $lineno   = $4;
                        $data     = $5;
                } else {
                        print qq(  <tr><td colspan="5" class="error">Unable to parse: $line</td></tr>\n);
                        next;
                }
                $short_rev  = substr ($long_rev, 0, 8);
                $age        = time () - $time;
                $age_str    = age_string ($age);
                $age_str    =~ s/ /&nbsp;/g;
                $age_class  = age_class($age);
                $author     = esc_html ($author);
                $author     =~ s/ /&nbsp;/g;
                # escape tabs
                while ((my $pos = index($data, "\t")) != -1) {
                        if (my $count = (8 - ($pos % 8))) {
                                my $spaces = ' ' x $count;
                                $data =~ s/\t/$spaces/;
                        }
                }
                $data = esc_html ($data);

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

sub git_tags {
        my $head = git_read_head($project);
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog")}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log")}, "log") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$head")}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$head")}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("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;
                        my $comment_lines = $tag{'comment'};
                        my $comment = shift @$comment_lines;
                        if (defined($comment)) {
                                $comment = chop_str($comment, 30, 5);
                        }
                        if ($alternate) {
                                print "<tr class=\"dark\">\n";
                        } else {
                                print "<tr class=\"light\">\n";
                        }
                        $alternate ^= 1;
                        print "<td><i>$tag{'age'}</i></td>\n" .
                              "<td>" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=$tag{'reftype'};h=$tag{'refid'}"), -class => "list"},
                              "<b>" . esc_html($tag{'name'}) . "</b>") .
                              "</td>\n" .
                              "<td>";
                        if (defined($comment)) {
                              print $cgi->a({-class => "list", -href => "$my_uri?" . esc_param("p=$project;a=tag;h=$tag{'id'}")}, $comment);
                        }
                        print "</td>\n" .
                              "<td class=\"link\">";
                        if ($tag{'type'} eq "tag") {
                              print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tag;h=$tag{'id'}")}, "tag") . " | ";
                        }
                        print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=$tag{'reftype'};h=$tag{'refid'}")}, $tag{'reftype'});
                        if ($tag{'reftype'} eq "commit") {
                              print " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog;h=$tag{'name'}")}, "shortlog") .
                                    " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log;h=$tag{'refid'}")}, "log");
                        }
                        print "</td>\n" .
                              "</tr>";
                }
        }
        print "</table\n>";
        git_footer_html();
}

sub git_heads {
        my $head = git_read_head($project);
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog")}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log")}, "log") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$head")}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$head")}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("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?" . esc_param("p=$project;a=shortlog;h=$tag{'name'}"), -class => "list"}, "<b>" . esc_html($tag{'name'}) . "</b>") .
                              "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog;h=$tag{'name'}")}, "shortlog") .
                              " | " . $cgi->a({-href => "$my_uri?" . esc_param("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 = validate_input(unquote($4));
                        if ($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 = $hash_base || git_read_head($project);
                $hash = git_get_hash_by_path($base, $file_name, "blob") || die_error(undef, "Error lookup file.");
        }
        my $have_blame = git_get_project_config_bool ('blame');
        open my $fd, "-|", "$gitbin/git-cat-file blob $hash" or die_error(undef, "Open failed.");
        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?" . esc_param("p=$project;a=summary")}, "summary") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog")}, "shortlog") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log")}, "log") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash_base")}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$hash_base")}, "commitdiff") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$co{'tree'};hb=$hash_base")}, "tree") . "<br/>\n";
                if (defined $file_name) {
                        if ($have_blame) {
                                print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blame;h=$hash;hb=$hash_base;f=$file_name")}, "blame") .  " | ";
                        }
                        print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob_plain;h=$hash;f=$file_name")}, "plain") .
                        " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;hb=HEAD;f=$file_name")}, "head") . "<br/>\n";
                } else {
                        print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob_plain;h=$hash")}, "plain") . "<br/>\n";
                }
                print "</div>\n".
                       "<div>" .
                      $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash_base"), -class => "title"}, esc_html($co{'title'})) .
                      "</div>\n";
        } else {
                print "<div class=\"page_nav\">\n" .
                      "<br/><br/></div>\n" .
                      "<div class=\"title\">$hash</div>\n";
        }
        if (defined $file_name) {
                print "<div class=\"page_path\"><b>" . esc_html($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, $nr, esc_html($line);
        }
        close $fd or print "Reading blob failed.\n";
        print "</div>";
        git_footer_html();
}

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

        my %mimemap;
        open(MIME, $mimemap) or return undef;
        while (<MIME>) {
                my ($mime, $exts) = split(/\t+/);
                my @exts = split(/\s+/, $exts);
                foreach my $ext (@exts) {
                        $mimemap{$ext} = $mime;
                }
        }
        close(MIME);

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

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

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

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

        # just in case
        return $default_blob_plain_mimetype unless $fd;

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

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

sub git_blob_plain {
        open my $fd, "-|", "$gitbin/git-cat-file blob $hash" or return;
        my $type = git_blob_plain_mimetype($fd, $file_name);

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

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

sub git_tree {
        if (!defined $hash) {
                $hash = git_read_head($project);
                if (defined $file_name) {
                        my $base = $hash_base || $hash;
                        $hash = git_get_hash_by_path($base, $file_name, "tree");
                }
                if (!defined $hash_base) {
                        $hash_base = $hash;
                }
        }
        $/ = "\0";
        open my $fd, "-|", "$gitbin/git-ls-tree -z $hash" or die_error(undef, "Open git-ls-tree failed.");
        chomp (my (@entries) = <$fd>);
        close $fd or die_error(undef, "Reading tree failed.");
        $/ = "\n";

        my $refs = read_info_ref();
        my $ref = "";
        if (defined $refs->{$hash_base}) {
                $ref = " <span class=\"tag\">" . esc_html($refs->{$hash_base}) . "</span>";
        }
        git_header_html();
        my $base_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?" . esc_param("p=$project;a=summary")}, "summary") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog;h=$hash_base")}, "shortlog") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log;h=$hash_base")}, "log") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash_base")}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$hash_base")}, "commitdiff") .
                      " | tree" .
                      "<br/><br/>\n" .
                      "</div>\n";
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash_base"), -class => "title"}, esc_html($co{'title'}) . $ref) . "\n" .
                      "</div>\n";
        } else {
                print "<div class=\"page_nav\">\n";
                print "<br/><br/></div>\n";
                print "<div class=\"title\">$hash</div>\n";
        }
        if (defined $file_name) {
                $base = esc_html("$file_name/");
                print "<div class=\"page_path\"><b>/" . esc_html($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 = validate_input($4);
                if ($alternate) {
                        print "<tr class=\"dark\">\n";
                } else {
                        print "<tr class=\"light\">\n";
                }
                $alternate ^= 1;
                print "<td class=\"mode\">" . mode_str($t_mode) . "</td>\n";
                if ($t_type eq "blob") {
                        print "<td class=\"list\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;h=$t_hash$base_key;f=$base$t_name"), -class => "list"}, esc_html($t_name)) .
                              "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;h=$t_hash$base_key;f=$base$t_name")}, "blob") .
#                             " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blame;h=$t_hash$base_key;f=$base$t_name")}, "blame") .
                              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=history;h=$hash_base;f=$base$t_name")}, "history") .
                              "</td>\n";
                } elsif ($t_type eq "tree") {
                        print "<td class=\"list\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$t_hash$base_key;f=$base$t_name")}, esc_html($t_name)) .
                              "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$t_hash$base_key;f=$base$t_name")}, "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=150 " . git_read_head($project) 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>" . esc_html("$my_url?p=$project;a=summary") . "</link>\n".
              "<description>$project log</description>\n".
              "<language>en</language>\n";

        for (my $i = 0; $i <= $#revlist; $i++) {
                my $commit = $revlist[$i];
                my %co = git_read_commit($commit);
                # we read 150, we always show 30 and the ones more recent than 48 hours
                if (($i >= 20) && ((time - $co{'committer_epoch'}) > 48*60*60)) {
                        last;
                }
                my %cd = date_str($co{'committer_epoch'});
                open $fd, "-|", "$gitbin/git-diff-tree -r $co{'parent'} $co{'id'}" or next;
                my @difftree = map { chomp; $_ } <$fd>;
                close $fd or next;
                print "<item>\n" .
                      "<title>" .
                      sprintf("%d %s %02d:%02d", $cd{'mday'}, $cd{'month'}, $cd{'hour'}, $cd{'minute'}) . " - " . esc_html($co{'title'}) .
                      "</title>\n" .
                      "<author>" . esc_html($co{'author'}) . "</author>\n" .
                      "<pubDate>$cd{'rfc2822'}</pubDate>\n" .
                      "<guid isPermaLink=\"true\">" . esc_html("$my_url?p=$project;a=commit;h=$commit") . "</guid>\n" .
                      "<link>" . esc_html("$my_url?p=$project;a=commit;h=$commit") . "</link>\n" .
                      "<description>" . esc_html($co{'title'}) . "</description>\n" .
                      "<content:encoded>" .
                      "<![CDATA[\n";
                my $comment = $co{'comment'};
                foreach my $line (@$comment) {
                        $line = decode("utf8", $line, Encode::FB_DEFAULT);
                        print "$line<br/>\n";
                }
                print "<br/>\n";
                foreach my $line (@difftree) {
                        if (!($line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)([0-9]{0,3})\t(.*)$/)) {
                                next;
                        }
                        my $file = validate_input(unquote($7));
                        $file = decode("utf8", $file, Encode::FB_DEFAULT);
                        print "$file<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 $head = git_read_head($proj{'path'});
                if (!defined $head) {
                        next;
                }
                $ENV{'GIT_DIR'} = "$projectroot/$proj{'path'}";
                my %co = git_read_commit($head);
                if (!%co) {
                        next;
                }

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

sub git_log {
        my $head = git_read_head($project);
        if (!defined $hash) {
                $hash = $head;
        }
        if (!defined $page) {
                $page = 0;
        }
        my $refs = read_info_ref();
        git_header_html();
        print "<div class=\"page_nav\">\n";
        print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog;h=$hash")}, "shortlog") .
              " | log" .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash")}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$hash")}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("p=$project;a=log")}, "HEAD");
        } else {
                print "HEAD";
        }
        if ($page > 0) {
                print " &sdot; " .
                $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("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?" . esc_param("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 $ref = "";
                if (defined $refs->{$commit}) {
                        $ref = " <span class=\"tag\">" . esc_html($refs->{$commit}) . "</span>";
                }
                my %co = git_read_commit($commit);
                next if !%co;
                my %ad = date_str($co{'author_epoch'});
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit"), -class => "title"},
                      "<span class=\"age\">$co{'age_string'}</span>" . esc_html($co{'title'}) . $ref) . "\n";
                print "</div>\n";
                print "<div class=\"title_text\">\n" .
                      "<div class=\"log_link\">\n" .
                      $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit")}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$commit")}, "commitdiff") .
                      "<br/>\n" .
                      "</div>\n" .
                      "<i>" . esc_html($co{'author_name'}) .  " [$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 = "";
        my $parent = $co{'parent'};
        if (!defined $parent) {
                $root = " --root";
                $parent = "";
        }
        open my $fd, "-|", "$gitbin/git-diff-tree -r -M $root $parent $hash" or die_error(undef, "Open failed.");
        @difftree = map { chomp; $_ } <$fd>;
        close $fd or die_error(undef, "Reading diff-tree failed.");

        # non-textual hash id's can be cached
        my $expires;
        if ($hash =~ m/^[0-9a-fA-F]{40}$/) {
                $expires = "+1d";
        }
        my $refs = read_info_ref();
        my $ref = "";
        if (defined $refs->{$co{'id'}}) {
                $ref = " <span class=\"tag\">" . esc_html($refs->{$co{'id'}}) . "</span>";
        }
        git_header_html(undef, $expires);
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog;h=$hash")}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log;h=$hash")}, "log") .
              " | commit";
        if (defined $co{'parent'}) {
                print " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$hash")}, "commitdiff");
        }
        print " | " . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("p=$project;a=commitdiff;h=$hash"), -class => "title"}, esc_html($co{'title'}) . $ref) . "\n" .
                      "</div>\n";
        } else {
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$co{'tree'};hb=$hash"), -class => "title"}, esc_html($co{'title'})) . "\n" .
                      "</div>\n";
        }
        print "<div class=\"title_text\">\n" .
              "<table cellspacing=\"0\">\n";
        print "<tr><td>author</td><td>" . esc_html($co{'author'}) . "</td></tr>\n".
              "<tr>" .
              "<td></td><td> $ad{'rfc2822'}";
        if ($ad{'hour_local'} < 6) {
                printf(" (<span class=\"atnight\">%02d:%02d</span> %s)", $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'});
        } else {
                printf(" (%02d:%02d %s)", $ad{'hour_local'}, $ad{'minute_local'}, $ad{'tz_local'});
        }
        print "</td>" .
              "</tr>\n";
        print "<tr><td>committer</td><td>" . esc_html($co{'committer'}) . "</td></tr>\n";
        print "<tr><td></td><td> $cd{'rfc2822'}" . sprintf(" (%02d:%02d %s)", $cd{'hour_local'}, $cd{'minute_local'}, $cd{'tz_local'}) . "</td></tr>\n";
        print "<tr><td>commit</td><td class=\"sha1\">$co{'id'}</td></tr>\n";
        print "<tr>" .
              "<td>tree</td>" .
              "<td class=\"sha1\">" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$co{'tree'};hb=$hash"), class => "list"}, $co{'tree'}) .
              "</td>" .
              "<td class=\"link\">" . $cgi->a({-href => "$my_uri?" . esc_param("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 class=\"sha1\">" . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$par"), class => "list"}, $par) . "</td>" .
                      "<td class=\"link\">" .
                      $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$par")}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("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) {
                        $signed = 1;
                        print "<span class=\"signoff\">" . esc_html($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 class=\"diff_tree\">\n";
        my $alternate = 0;
        foreach my $line (@difftree) {
                # ':100644 100644 03b218260e99b78c6df0ed378e59ed9205ccc96d 3b93d5e7cc7f7dd4ebed13a5cc1a4ad976fc94d8 M      ls-files.c'
                # ':100644 100644 7f9281985086971d3877aca27704f2aaf9c448ce bc190ebc71bbd923f2b728e505408f5e54bd073a M      rev-tree.c'
                if (!($line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)([0-9]{0,3})\t(.*)$/)) {
                        next;
                }
                my $from_mode = $1;
                my $to_mode = $2;
                my $from_id = $3;
                my $to_id = $4;
                my $status = $5;
                my $similarity = $6;
                my $file = validate_input(unquote($7));
                if ($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?" . esc_param("p=$project;a=blob;h=$to_id;hb=$hash;f=$file"), -class => "list"}, esc_html($file)) . "</td>\n" .
                              "<td><span class=\"file_status new\">[new " . file_type($to_mode) . "$mode_chng]</span></td>\n" .
                              "<td class=\"link\">" . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("p=$project;a=blob;h=$from_id;hb=$hash;f=$file"), -class => "list"}, esc_html($file)) . "</td>\n" .
                              "<td><span class=\"file_status deleted\">[deleted " . file_type($from_mode). "]</span></td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;h=$from_id;hb=$hash;f=$file")}, "blob") .
                              " | " . $cgi->a({-href => "$my_uri?" . esc_param("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 class=\"file_status mode_chnge\">[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?" . esc_param("p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$file"), -class => "list"}, esc_html($file));
                        } else {
                                print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;h=$to_id;hb=$hash;f=$file"), -class => "list"}, esc_html($file));
                        }
                        print "</td>\n" .
                              "<td>$mode_chnge</td>\n" .
                              "<td class=\"link\">";
                        print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;h=$to_id;hb=$hash;f=$file")}, "blob");
                        if ($to_id ne $from_id) {
                                print " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blobdiff;h=$to_id;hp=$from_id;hb=$hash;f=$file")}, "diff");
                        }
                        print " | " . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("p=$project;a=blob;h=$to_id;hb=$hash;f=$to_file"), -class => "list"}, esc_html($to_file)) . "</td>\n" .
                              "<td><span class=\"file_status moved\">[moved from " .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;h=$from_id;hb=$hash;f=$from_file"), -class => "list"}, esc_html($from_file)) .
                              " with " . (int $similarity) . "% similarity$mode_chng]</span></td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("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?" . esc_param("p=$project;a=summary")}, "summary") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog")}, "shortlog") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log")}, "log") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash_base")}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$hash_base")}, "commitdiff") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$co{'tree'};hb=$hash_base")}, "tree") .
                      "<br/>\n";
                print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blobdiff_plain;h=$hash;hp=$hash_parent")}, "plain") .
                      "</div>\n";
                print "<div>\n" .
                      $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash_base"), -class => "title"}, esc_html($co{'title'})) . "\n" .
                      "</div>\n";
        } else {
                print "<div class=\"page_nav\">\n" .
                      "<br/><br/></div>\n" .
                      "<div class=\"title\">$hash vs $hash_parent</div>\n";
        }
        if (defined $file_name) {
                print "<div class=\"page_path\"><b>/" . esc_html($file_name) . "</b></div>\n";
        }
        print "<div class=\"page_body\">\n" .
              "<div class=\"diff_info\">blob:" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;h=$hash_parent;hb=$hash_base;f=$file_name")}, $hash_parent) .
              " -> blob:" .
              $cgi->a({-href => "$my_uri?" . esc_param("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.");

        # non-textual hash id's can be cached
        my $expires;
        if ($hash =~ m/^[0-9a-fA-F]{40}$/) {
                $expires = "+1d";
        }
        my $refs = read_info_ref();
        my $ref = "";
        if (defined $refs->{$co{'id'}}) {
                $ref = " <span class=\"tag\">" . esc_html($refs->{$co{'id'}}) . "</span>";
        }
        git_header_html(undef, $expires);
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog;h=$hash")}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log;h=$hash")}, "log") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash")}, "commit") .
              " | commitdiff" .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$co{'tree'};hb=$hash")}, "tree") . "<br/>\n";
        print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff_plain;h=$hash;hp=$hash_parent")}, "plain") . "\n" .
              "</div>\n";
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash"), -class => "title"}, esc_html($co{'title'}) . $ref) . "\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 = validate_input(unquote($6));
                if ($status eq "A") {
                        print "<div class=\"diff_info\">" .  file_type($to_mode) . ":" .
                              $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("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?" . esc_param("p=$project;a=blob;h=$from_id;hb=$hash;f=$file")}, $from_id) .
                                      " -> " .
                                      file_type($to_mode) . ":" . $cgi->a({-href => "$my_uri?" . esc_param("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 $refs = read_info_ref("tags");
        open $fd, "-|", "$gitbin/git-rev-list HEAD";
        chomp (my (@commits) = <$fd>);
        close $fd;
        foreach my $commit (@commits) {
                if (defined $refs->{$commit}) {
                        $tagname = $refs->{$commit}
                }
                if ($commit eq $hash) {
                        last;
                }
        }

        print $cgi->header(-type => "text/plain", -charset => 'utf-8', '-content-disposition' => "inline; filename=\"git-$hash.patch\"");
        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) {
                $hash = git_read_head($project);
        }
        my %co = git_read_commit($hash);
        if (!%co) {
                die_error(undef, "Unknown commit object.");
        }
        my $refs = read_info_ref();
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog")}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log")}, "log") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash")}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$hash")}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$co{'tree'};hb=$hash")}, "tree") .
              "<br/><br/>\n" .
              "</div>\n";
        print "<div>\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash"), -class => "title"}, esc_html($co{'title'})) . "\n" .
              "</div>\n";
        print "<div class=\"page_path\"><b>/" . esc_html($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;
                        }
                        my $ref = "";
                        if (defined $refs->{$commit}) {
                                $ref = " <span class=\"tag\">" . esc_html($refs->{$commit}) . "</span>";
                        }
                        if ($alternate) {
                                print "<tr class=\"dark\">\n";
                        } else {
                                print "<tr class=\"light\">\n";
                        }
                        $alternate ^= 1;
                        print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
                              "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 3)) . "</i></td>\n" .
                              "<td>" . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit"), -class => "list"}, "<b>" .
                              esc_html(chop_str($co{'title'}, 50)) . "$ref</b>") . "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit")}, "commit") .
                              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$commit")}, "commitdiff") .
                              " | " . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("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) {
                $hash = git_read_head($project);
        }
        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?" . esc_param("p=$project;a=summary;h=$hash")}, "summary") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=shortlog")}, "shortlog") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log;h=$hash")}, "log") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash")}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$hash")}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$co{'tree'};hb=$hash")}, "tree") .
              "<br/><br/>\n" .
              "</div>\n";

        print "<div>\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash"), -class => "title"}, esc_html($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 --parents $hash" or next;
                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", $commit_text;
                        my %co = git_read_commit(undef, \@commit_lines);
                        if (!%co) {
                                next;
                        }
                        if ($alternate) {
                                print "<tr class=\"dark\">\n";
                        } else {
                                print "<tr class=\"light\">\n";
                        }
                        $alternate ^= 1;
                        print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
                              "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
                              "<td>" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$co{'id'}"), -class => "list"}, "<b>" . esc_html(chop_str($co{'title'}, 50)) . "</b><br/>");
                        my $comment = $co{'comment'};
                        foreach my $line (@$comment) {
                                if ($line =~ m/^(.*)($searchtext)(.*)$/i) {
                                        my $lead = esc_html($1) || "";
                                        $lead = chop_str($lead, 30, 10);
                                        my $match = esc_html($2) || "";
                                        my $trail = esc_html($3) || "";
                                        $trail = chop_str($trail, 30, 10);
                                        my $text = "$lead<span class=\"match\">$match</span>$trail";
                                        print chop_str($text, 80, 5) . "<br/>\n";
                                }
                        }
                        print "</td>\n" .
                              "<td class=\"link\">" .
                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$co{'id'}")}, "commit") .
                              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=tree;h=$co{'tree'};hb=$co{'id'}")}, "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>$co{'age_string_date'}</i></td>\n" .
                                              "<td><i>" . esc_html(chop_str($co{'author_name'}, 15, 5)) . "</i></td>\n" .
                                              "<td>" .
                                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$co{'id'}"), -class => "list"}, "<b>" .
                                              esc_html(chop_str($co{'title'}, 50)) . "</b><br/>");
                                        while (my $setref = shift @files) {
                                                my %set = %$setref;
                                                print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=blob;h=$set{'id'};hb=$co{'id'};f=$set{'file'}"), class => "list"},
                                                      "<span class=\"match\">" . esc_html($set{'file'}) . "</span>") .
                                                      "<br/>\n";
                                        }
                                        print "</td>\n" .
                                              "<td class=\"link\">" .
                                              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$co{'id'}")}, "commit") .
                                              " | " . $cgi->a({-href => "$my_uri?" . esc_param("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 $head = git_read_head($project);
        if (!defined $hash) {
                $hash = $head;
        }
        if (!defined $page) {
                $page = 0;
        }
        my $refs = read_info_ref();
        git_header_html();
        print "<div class=\"page_nav\">\n" .
              $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=summary")}, "summary") .
              " | shortlog" .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=log;h=$hash")}, "log") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$hash")}, "commit") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commitdiff;h=$hash")}, "commitdiff") .
              " | " . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("p=$project;a=shortlog")}, "HEAD");
        } else {
                print "HEAD";
        }
        if ($page > 0) {
                print " &sdot; " .
                $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("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?" . esc_param("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 $ref = "";
                if (defined $refs->{$commit}) {
                        $ref = " <span class=\"tag\">" . esc_html($refs->{$commit}) . "</span>";
                }
                my %co = git_read_commit($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>$co{'age_string_date'}</i></td>\n" .
                      "<td><i>" . esc_html(chop_str($co{'author_name'}, 10)) . "</i></td>\n" .
                      "<td>";
                if (length($co{'title_short'}) < length($co{'title'})) {
                        print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit"), -class => "list", -title => "$co{'title'}"},
                              "<b>" . esc_html($co{'title_short'}) . "$ref</b>");
                } else {
                        print $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit"), -class => "list"},
                              "<b>" . esc_html($co{'title_short'}) . "$ref</b>");
                }
                print "</td>\n" .
                      "<td class=\"link\">" .
                      $cgi->a({-href => "$my_uri?" . esc_param("p=$project;a=commit;h=$commit")}, "commit") .
                      " | " . $cgi->a({-href => "$my_uri?" . esc_param("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?" . esc_param("p=$project;a=shortlog;h=$hash;pg=" . ($page+1)), -title => "Alt-n"}, "next") .
                      "</td>\n" .
                      "</tr>\n";
        }
        print "</table\n>";
        git_footer_html();
}