Initial commit
authorGabriel Pérez-Cerezo <gabriel@gpcf.eu>
Mon, 10 Oct 2016 15:37:35 +0000 (17:37 +0200)
committerGabriel Pérez-Cerezo <gabriel@gpcf.eu>
Mon, 10 Oct 2016 15:37:35 +0000 (17:37 +0200)
gitweb.cgi [new file with mode: 0755]
index.cgi [new file with mode: 0755]
static/git-favicon.png [new file with mode: 0644]
static/git-logo.png [new file with mode: 0644]
static/gitweb.css [new file with mode: 0644]
static/gitweb.js [new file with mode: 0644]

diff --git a/gitweb.cgi b/gitweb.cgi
new file mode 100755 (executable)
index 0000000..11872f4
--- /dev/null
@@ -0,0 +1,8437 @@
+#!/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 5.008;
+use strict;
+use warnings;
+use CGI qw(:standard :escapeHTML -nosticky);
+use CGI::Util qw(unescape);
+use CGI::Carp qw(fatalsToBrowser set_message);
+use Encode;
+use Fcntl ':mode';
+use File::Find qw();
+use File::Basename qw(basename);
+use Time::HiRes qw(gettimeofday tv_interval);
+binmode STDOUT, ':utf8';
+
+if (!defined($CGI::VERSION) || $CGI::VERSION < 4.08) {
+       eval 'sub CGI::multi_param { CGI::param(@_) }'
+}
+
+our $t0 = [ gettimeofday() ];
+our $number_of_git_cmds = 0;
+
+BEGIN {
+       CGI->compile() if $ENV{'MOD_PERL'};
+}
+
+our $version = "2.1.4";
+
+our ($my_url, $my_uri, $base_url, $path_info, $home_link);
+sub evaluate_uri {
+       our $cgi;
+
+       our $my_url = $cgi->url();
+       our $my_uri = $cgi->url(-absolute => 1);
+
+       # Base URL for relative URLs in gitweb ($logo, $favicon, ...),
+       # needed and used only for URLs with nonempty PATH_INFO
+       our $base_url = $my_url;
+
+       # When the script is used as DirectoryIndex, the URL does not contain the name
+       # of the script file itself, and $cgi->url() fails to strip PATH_INFO, so we
+       # have to do it ourselves. We make $path_info global because it's also used
+       # later on.
+       #
+       # Another issue with the script being the DirectoryIndex is that the resulting
+       # $my_url data is not the full script URL: this is good, because we want
+       # generated links to keep implying the script name if it wasn't explicitly
+       # indicated in the URL we're handling, but it means that $my_url cannot be used
+       # as base URL.
+       # Therefore, if we needed to strip PATH_INFO, then we know that we have
+       # to build the base URL ourselves:
+       our $path_info = decode_utf8($ENV{"PATH_INFO"});
+       if ($path_info) {
+               # $path_info has already been URL-decoded by the web server, but
+               # $my_url and $my_uri have not. URL-decode them so we can properly
+               # strip $path_info.
+               $my_url = unescape($my_url);
+               $my_uri = unescape($my_uri);
+               if ($my_url =~ s,\Q$path_info\E$,, &&
+                   $my_uri =~ s,\Q$path_info\E$,, &&
+                   defined $ENV{'SCRIPT_NAME'}) {
+                       $base_url = $cgi->url(-base => 1) . $ENV{'SCRIPT_NAME'};
+               }
+       }
+
+       # target of the home link on top of all pages
+       our $home_link = $my_uri || "/";
+}
+
+# core git executable to use
+# this can just be "git" if your webserver has a sensible PATH
+our $GIT = "/usr/bin/git";
+
+# absolute fs-path which will be prepended to the project path
+#our $projectroot = "/pub/scm";
+our $projectroot = "/pub/git";
+
+# fs traversing limit for getting project list
+# the number is relative to the projectroot
+our $project_maxdepth = 2007;
+
+# string of the home link on top of all pages
+our $home_link_str = "projects";
+
+# extra breadcrumbs preceding the home link
+our @extra_breadcrumbs = ();
+
+# name of your site or organization to appear in page titles
+# replace this with something more descriptive for clearer bookmarks
+our $site_name = ""
+                 || ($ENV{'SERVER_NAME'} || "Untitled") . " Git";
+
+# html snippet to include in the <head> section of each page
+our $site_html_head_string = "";
+# filename of html text to include at top of each page
+our $site_header = "";
+# html text to include at home page
+our $home_text = "indextext.html";
+# filename of html text to include at bottom of each page
+our $site_footer = "";
+
+# URI of stylesheets
+our @stylesheets = ("static/gitweb.css");
+# URI of a single stylesheet, which can be overridden in GITWEB_CONFIG.
+our $stylesheet = undef;
+# URI of GIT logo (72x27 size)
+our $logo = "static/git-logo.png";
+# URI of GIT favicon, assumed to be image/png type
+our $favicon = "static/git-favicon.png";
+# URI of gitweb.js (JavaScript code for gitweb)
+our $javascript = "static/gitweb.js";
+
+# URI and label (title) of GIT logo link
+#our $logo_url = "http://www.kernel.org/pub/software/scm/git/docs/";
+#our $logo_label = "git documentation";
+our $logo_url = "http://git-scm.com/";
+our $logo_label = "git homepage";
+
+# source of projects list
+our $projects_list = "";
+
+# the width (in characters) of the projects list "Description" column
+our $projects_list_description_width = 25;
+
+# group projects by category on the projects list
+# (enabled if this variable evaluates to true)
+our $projects_list_group_categories = 0;
+
+# default category if none specified
+# (leave the empty string for no category)
+our $project_list_default_category = "";
+
+# default order of projects list
+# valid values are none, project, descr, owner, and age
+our $default_projects_order = "project";
+
+# show repository only if this file exists
+# (only effective if this variable evaluates to true)
+our $export_ok = "";
+
+# don't generate age column on the projects list page
+our $omit_age_column = 0;
+
+# don't generate information about owners of repositories
+our $omit_owner=0;
+
+# show repository only if this subroutine returns true
+# when given the path to the project, for example:
+#    sub { return -e "$_[0]/git-daemon-export-ok"; }
+our $export_auth_hook = undef;
+
+# only allow viewing of repositories also shown on the overview page
+our $strict_export = "";
+
+# list of git base URLs used for URL to where fetch project from,
+# i.e. full URL is "$git_base_url/$project"
+our @git_base_url_list = grep { $_ ne '' } ("");
+
+# default blob_plain mimetype and default charset for text/plain blob
+our $default_blob_plain_mimetype = 'text/plain';
+our $default_text_plain_charset  = undef;
+
+# file to use for guessing MIME types before trying /etc/mime.types
+# (relative to the current git repository)
+our $mimetypes_file = undef;
+
+# assume this charset if line contains non-UTF-8 characters;
+# it should be valid encoding (see Encoding::Supported(3pm) for list),
+# for which encoding all byte sequences are valid, for example
+# 'iso-8859-1' aka 'latin1' (it is decoded without checking, so it
+# could be even 'utf-8' for the old behavior)
+our $fallback_encoding = 'latin1';
+
+# rename detection options for git-diff and git-diff-tree
+# - default is '-M', with the cost proportional to
+#   (number of removed files) * (number of new files).
+# - more costly is '-C' (which implies '-M'), with the cost proportional to
+#   (number of changed files + number of removed files) * (number of new files)
+# - even more costly is '-C', '--find-copies-harder' with cost
+#   (number of files in the original tree) * (number of new files)
+# - one might want to include '-B' option, e.g. '-B', '-M'
+our @diff_opts = ('-M'); # taken from git_commit
+
+# Disables features that would allow repository owners to inject script into
+# the gitweb domain.
+our $prevent_xss = 0;
+
+# Path to the highlight executable to use (must be the one from
+# http://www.andre-simon.de due to assumptions about parameters and output).
+# Useful if highlight is not installed on your webserver's PATH.
+# [Default: highlight]
+our $highlight_bin = "highlight";
+
+# information about snapshot formats that gitweb is capable of serving
+our %known_snapshot_formats = (
+       # name => {
+       #       'display' => display name,
+       #       'type' => mime type,
+       #       'suffix' => filename suffix,
+       #       'format' => --format for git-archive,
+       #       'compressor' => [compressor command and arguments]
+       #                       (array reference, optional)
+       #       'disabled' => boolean (optional)}
+       #
+       'tgz' => {
+               'display' => 'tar.gz',
+               'type' => 'application/x-gzip',
+               'suffix' => '.tar.gz',
+               'format' => 'tar',
+               'compressor' => ['gzip', '-n']},
+
+       'tbz2' => {
+               'display' => 'tar.bz2',
+               'type' => 'application/x-bzip2',
+               'suffix' => '.tar.bz2',
+               'format' => 'tar',
+               'compressor' => ['bzip2']},
+
+       'txz' => {
+               'display' => 'tar.xz',
+               'type' => 'application/x-xz',
+               'suffix' => '.tar.xz',
+               'format' => 'tar',
+               'compressor' => ['xz'],
+               'disabled' => 1},
+
+       'zip' => {
+               'display' => 'zip',
+               'type' => 'application/x-zip',
+               'suffix' => '.zip',
+               'format' => 'zip'},
+);
+
+# Aliases so we understand old gitweb.snapshot values in repository
+# configuration.
+our %known_snapshot_format_aliases = (
+       'gzip'  => 'tgz',
+       'bzip2' => 'tbz2',
+       'xz'    => 'txz',
+
+       # backward compatibility: legacy gitweb config support
+       'x-gzip' => undef, 'gz' => undef,
+       'x-bzip2' => undef, 'bz2' => undef,
+       'x-zip' => undef, '' => undef,
+);
+
+# Pixel sizes for icons and avatars. If the default font sizes or lineheights
+# are changed, it may be appropriate to change these values too via
+# $GITWEB_CONFIG.
+our %avatar_size = (
+       'default' => 16,
+       'double'  => 32
+);
+
+# Used to set the maximum load that we will still respond to gitweb queries.
+# If server load exceed this value then return "503 server busy" error.
+# If gitweb cannot determined server load, it is taken to be 0.
+# Leave it undefined (or set to 'undef') to turn off load checking.
+our $maxload = 300;
+
+# configuration for 'highlight' (http://www.andre-simon.de/)
+# match by basename
+our %highlight_basename = (
+       #'Program' => 'py',
+       #'Library' => 'py',
+       'SConstruct' => 'py', # SCons equivalent of Makefile
+       'Makefile' => 'make',
+);
+# match by extension
+our %highlight_ext = (
+       # main extensions, defining name of syntax;
+       # see files in /usr/share/highlight/langDefs/ directory
+       (map { $_ => $_ } qw(py rb java css js tex bib xml awk bat ini spec tcl sql)),
+       # alternate extensions, see /etc/highlight/filetypes.conf
+       (map { $_ => 'c'   } qw(c h)),
+       (map { $_ => 'sh'  } qw(sh bash zsh ksh)),
+       (map { $_ => 'cpp' } qw(cpp cxx c++ cc)),
+       (map { $_ => 'php' } qw(php php3 php4 php5 phps)),
+       (map { $_ => 'pl'  } qw(pl perl pm)), # perhaps also 'cgi'
+       (map { $_ => 'make'} qw(make mak mk)),
+       (map { $_ => 'xml' } qw(xml xhtml html htm)),
+);
+
+# You define site-wide feature defaults here; override them with
+# $GITWEB_CONFIG as necessary.
+our %feature = (
+       # feature => {
+       #       'sub' => feature-sub (subroutine),
+       #       'override' => allow-override (boolean),
+       #       'default' => [ default options...] (array reference)}
+       #
+       # if feature is overridable (it means that allow-override has true value),
+       # then feature-sub will be called with default options as parameters;
+       # return value of feature-sub indicates if to enable specified feature
+       #
+       # if there is no 'sub' key (no feature-sub), then feature cannot be
+       # overridden
+       #
+       # use gitweb_get_feature(<feature>) to retrieve the <feature> value
+       # (an array) or gitweb_check_feature(<feature>) to check if <feature>
+       # is enabled
+
+       # Enable the 'blame' blob view, showing the last commit that modified
+       # each line in the file. This can be very CPU-intensive.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'blame'}{'default'} = [1];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'blame'}{'override'} = 1;
+       # and in project config gitweb.blame = 0|1;
+       'blame' => {
+               'sub' => sub { feature_bool('blame', @_) },
+               'override' => 0,
+               'default' => [0]},
+
+       # Enable the 'snapshot' link, providing a compressed archive of any
+       # tree. This can potentially generate high traffic if you have large
+       # project.
+
+       # Value is a list of formats defined in %known_snapshot_formats that
+       # you wish to offer.
+       # To disable system wide have in $GITWEB_CONFIG
+       # $feature{'snapshot'}{'default'} = [];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'snapshot'}{'override'} = 1;
+       # and in project config, a comma-separated list of formats or "none"
+       # to disable.  Example: gitweb.snapshot = tbz2,zip;
+       'snapshot' => {
+               'sub' => \&feature_snapshot,
+               'override' => 0,
+               'default' => ['tgz']},
+
+       # Enable text search, which will list the commits which match author,
+       # committer or commit text to a given string.  Enabled by default.
+       # Project specific override is not supported.
+       #
+       # Note that this controls all search features, which means that if
+       # it is disabled, then 'grep' and 'pickaxe' search would also be
+       # disabled.
+       'search' => {
+               'override' => 0,
+               'default' => [1]},
+
+       # Enable grep search, which will list the files in currently selected
+       # tree containing the given string. Enabled by default. This can be
+       # potentially CPU-intensive, of course.
+       # Note that you need to have 'search' feature enabled too.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'grep'}{'default'} = [1];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'grep'}{'override'} = 1;
+       # and in project config gitweb.grep = 0|1;
+       'grep' => {
+               'sub' => sub { feature_bool('grep', @_) },
+               'override' => 0,
+               'default' => [1]},
+
+       # Enable the pickaxe search, which will list the commits that modified
+       # a given string in a file. This can be practical and quite faster
+       # alternative to 'blame', but still potentially CPU-intensive.
+       # Note that you need to have 'search' feature enabled too.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'pickaxe'}{'default'} = [1];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'pickaxe'}{'override'} = 1;
+       # and in project config gitweb.pickaxe = 0|1;
+       'pickaxe' => {
+               'sub' => sub { feature_bool('pickaxe', @_) },
+               'override' => 0,
+               'default' => [1]},
+
+       # Enable showing size of blobs in a 'tree' view, in a separate
+       # column, similar to what 'ls -l' does.  This cost a bit of IO.
+
+       # To disable system wide have in $GITWEB_CONFIG
+       # $feature{'show-sizes'}{'default'} = [0];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'show-sizes'}{'override'} = 1;
+       # and in project config gitweb.showsizes = 0|1;
+       'show-sizes' => {
+               'sub' => sub { feature_bool('showsizes', @_) },
+               'override' => 0,
+               'default' => [1]},
+
+       # Make gitweb use an alternative format of the URLs which can be
+       # more readable and natural-looking: project name is embedded
+       # directly in the path and the query string contains other
+       # auxiliary information. All gitweb installations recognize
+       # URL in either format; this configures in which formats gitweb
+       # generates links.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'pathinfo'}{'default'} = [1];
+       # Project specific override is not supported.
+
+       # Note that you will need to change the default location of CSS,
+       # favicon, logo and possibly other files to an absolute URL. Also,
+       # if gitweb.cgi serves as your indexfile, you will need to force
+       # $my_uri to contain the script name in your $GITWEB_CONFIG.
+       'pathinfo' => {
+               'override' => 0,
+               'default' => [0]},
+
+       # Make gitweb consider projects in project root subdirectories
+       # to be forks of existing projects. Given project $projname.git,
+       # projects matching $projname/*.git will not be shown in the main
+       # projects list, instead a '+' mark will be added to $projname
+       # there and a 'forks' view will be enabled for the project, listing
+       # all the forks. If project list is taken from a file, forks have
+       # to be listed after the main project.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'forks'}{'default'} = [1];
+       # Project specific override is not supported.
+       'forks' => {
+               'override' => 0,
+               'default' => [0]},
+
+       # Insert custom links to the action bar of all project pages.
+       # This enables you mainly to link to third-party scripts integrating
+       # into gitweb; e.g. git-browser for graphical history representation
+       # or custom web-based repository administration interface.
+
+       # The 'default' value consists of a list of triplets in the form
+       # (label, link, position) where position is the label after which
+       # to insert the link and link is a format string where %n expands
+       # to the project name, %f to the project path within the filesystem,
+       # %h to the current hash (h gitweb parameter) and %b to the current
+       # hash base (hb gitweb parameter); %% expands to %.
+
+       # To enable system wide have in $GITWEB_CONFIG e.g.
+       # $feature{'actions'}{'default'} = [('graphiclog',
+       #       '/git-browser/by-commit.html?r=%n', 'summary')];
+       # Project specific override is not supported.
+       'actions' => {
+               'override' => 0,
+               'default' => []},
+
+       # Allow gitweb scan project content tags of project repository,
+       # and display the popular Web 2.0-ish "tag cloud" near the projects
+       # list.  Note that this is something COMPLETELY different from the
+       # normal Git tags.
+
+       # gitweb by itself can show existing tags, but it does not handle
+       # tagging itself; you need to do it externally, outside gitweb.
+       # The format is described in git_get_project_ctags() subroutine.
+       # You may want to install the HTML::TagCloud Perl module to get
+       # a pretty tag cloud instead of just a list of tags.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'ctags'}{'default'} = [1];
+       # Project specific override is not supported.
+
+       # In the future whether ctags editing is enabled might depend
+       # on the value, but using 1 should always mean no editing of ctags.
+       'ctags' => {
+               'override' => 0,
+               'default' => [0]},
+
+       # The maximum number of patches in a patchset generated in patch
+       # view. Set this to 0 or undef to disable patch view, or to a
+       # negative number to remove any limit.
+
+       # To disable system wide have in $GITWEB_CONFIG
+       # $feature{'patches'}{'default'} = [0];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'patches'}{'override'} = 1;
+       # and in project config gitweb.patches = 0|n;
+       # where n is the maximum number of patches allowed in a patchset.
+       'patches' => {
+               'sub' => \&feature_patches,
+               'override' => 0,
+               'default' => [16]},
+
+       # Avatar support. When this feature is enabled, views such as
+       # shortlog or commit will display an avatar associated with
+       # the email of the committer(s) and/or author(s).
+
+       # Currently available providers are gravatar and picon.
+       # If an unknown provider is specified, the feature is disabled.
+
+       # Gravatar depends on Digest::MD5.
+       # Picon currently relies on the indiana.edu database.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'avatar'}{'default'} = ['<provider>'];
+       # where <provider> is either gravatar or picon.
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'avatar'}{'override'} = 1;
+       # and in project config gitweb.avatar = <provider>;
+       'avatar' => {
+               'sub' => \&feature_avatar,
+               'override' => 0,
+               'default' => ['']},
+
+       # Enable displaying how much time and how many git commands
+       # it took to generate and display page.  Disabled by default.
+       # Project specific override is not supported.
+       'timed' => {
+               'override' => 0,
+               'default' => [0]},
+
+       # Enable turning some links into links to actions which require
+       # JavaScript to run (like 'blame_incremental').  Not enabled by
+       # default.  Project specific override is currently not supported.
+       'javascript-actions' => {
+               'override' => 0,
+               'default' => [0]},
+
+       # Enable and configure ability to change common timezone for dates
+       # in gitweb output via JavaScript.  Enabled by default.
+       # Project specific override is not supported.
+       'javascript-timezone' => {
+               'override' => 0,
+               'default' => [
+                       'local',     # default timezone: 'utc', 'local', or '(-|+)HHMM' format,
+                                    # or undef to turn off this feature
+                       'gitweb_tz', # name of cookie where to store selected timezone
+                       'datetime',  # CSS class used to mark up dates for manipulation
+               ]},
+
+       # Syntax highlighting support. This is based on Daniel Svensson's
+       # and Sham Chukoury's work in gitweb-xmms2.git.
+       # It requires the 'highlight' program present in $PATH,
+       # and therefore is disabled by default.
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'highlight'}{'default'} = [1];
+
+       'highlight' => {
+               'sub' => sub { feature_bool('highlight', @_) },
+               'override' => 0,
+               'default' => [0]},
+
+       # Enable displaying of remote heads in the heads list
+
+       # To enable system wide have in $GITWEB_CONFIG
+       # $feature{'remote_heads'}{'default'} = [1];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'remote_heads'}{'override'} = 1;
+       # and in project config gitweb.remoteheads = 0|1;
+       'remote_heads' => {
+               'sub' => sub { feature_bool('remote_heads', @_) },
+               'override' => 0,
+               'default' => [0]},
+
+       # Enable showing branches under other refs in addition to heads
+
+       # To set system wide extra branch refs have in $GITWEB_CONFIG
+       # $feature{'extra-branch-refs'}{'default'} = ['dirs', 'of', 'choice'];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'extra-branch-refs'}{'override'} = 1;
+       # and in project config gitweb.extrabranchrefs = dirs of choice
+       # Every directory is separated with whitespace.
+
+       'extra-branch-refs' => {
+               'sub' => \&feature_extra_branch_refs,
+               'override' => 0,
+               'default' => []},
+);
+
+sub gitweb_get_feature {
+       my ($name) = @_;
+       return unless exists $feature{$name};
+       my ($sub, $override, @defaults) = (
+               $feature{$name}{'sub'},
+               $feature{$name}{'override'},
+               @{$feature{$name}{'default'}});
+       # project specific override is possible only if we have project
+       our $git_dir; # global variable, declared later
+       if (!$override || !defined $git_dir) {
+               return @defaults;
+       }
+       if (!defined $sub) {
+               warn "feature $name is not overridable";
+               return @defaults;
+       }
+       return $sub->(@defaults);
+}
+
+# A wrapper to check if a given feature is enabled.
+# With this, you can say
+#
+#   my $bool_feat = gitweb_check_feature('bool_feat');
+#   gitweb_check_feature('bool_feat') or somecode;
+#
+# instead of
+#
+#   my ($bool_feat) = gitweb_get_feature('bool_feat');
+#   (gitweb_get_feature('bool_feat'))[0] or somecode;
+#
+sub gitweb_check_feature {
+       return (gitweb_get_feature(@_))[0];
+}
+
+
+sub feature_bool {
+       my $key = shift;
+       my ($val) = git_get_project_config($key, '--bool');
+
+       if (!defined $val) {
+               return ($_[0]);
+       } elsif ($val eq 'true') {
+               return (1);
+       } elsif ($val eq 'false') {
+               return (0);
+       }
+}
+
+sub feature_snapshot {
+       my (@fmts) = @_;
+
+       my ($val) = git_get_project_config('snapshot');
+
+       if ($val) {
+               @fmts = ($val eq 'none' ? () : split /\s*[,\s]\s*/, $val);
+       }
+
+       return @fmts;
+}
+
+sub feature_patches {
+       my @val = (git_get_project_config('patches', '--int'));
+
+       if (@val) {
+               return @val;
+       }
+
+       return ($_[0]);
+}
+
+sub feature_avatar {
+       my @val = (git_get_project_config('avatar'));
+
+       return @val ? @val : @_;
+}
+
+sub feature_extra_branch_refs {
+       my (@branch_refs) = @_;
+       my $values = git_get_project_config('extrabranchrefs');
+
+       if ($values) {
+               $values = config_to_multi ($values);
+               @branch_refs = ();
+               foreach my $value (@{$values}) {
+                       push @branch_refs, split /\s+/, $value;
+               }
+       }
+
+       return @branch_refs;
+}
+
+# checking HEAD file with -e is fragile if the repository was
+# initialized long time ago (i.e. symlink HEAD) and was pack-ref'ed
+# and then pruned.
+sub check_head_link {
+       my ($dir) = @_;
+       my $headfile = "$dir/HEAD";
+       return ((-e $headfile) ||
+               (-l $headfile && readlink($headfile) =~ /^refs\/heads\//));
+}
+
+sub check_export_ok {
+       my ($dir) = @_;
+       return (check_head_link($dir) &&
+               (!$export_ok || -e "$dir/$export_ok") &&
+               (!$export_auth_hook || $export_auth_hook->($dir)));
+}
+
+# process alternate names for backward compatibility
+# filter out unsupported (unknown) snapshot formats
+sub filter_snapshot_fmts {
+       my @fmts = @_;
+
+       @fmts = map {
+               exists $known_snapshot_format_aliases{$_} ?
+                      $known_snapshot_format_aliases{$_} : $_} @fmts;
+       @fmts = grep {
+               exists $known_snapshot_formats{$_} &&
+               !$known_snapshot_formats{$_}{'disabled'}} @fmts;
+}
+
+sub filter_and_validate_refs {
+       my @refs = @_;
+       my %unique_refs = ();
+
+       foreach my $ref (@refs) {
+               die_error(500, "Invalid ref '$ref' in 'extra-branch-refs' feature") unless (is_valid_ref_format($ref));
+               # 'heads' are added implicitly in get_branch_refs().
+               $unique_refs{$ref} = 1 if ($ref ne 'heads');
+       }
+       return sort keys %unique_refs;
+}
+
+# If it is set to code reference, it is code that it is to be run once per
+# request, allowing updating configurations that change with each request,
+# while running other code in config file only once.
+#
+# Otherwise, if it is false then gitweb would process config file only once;
+# if it is true then gitweb config would be run for each request.
+our $per_request_config = 1;
+
+# read and parse gitweb config file given by its parameter.
+# returns true on success, false on recoverable error, allowing
+# to chain this subroutine, using first file that exists.
+# dies on errors during parsing config file, as it is unrecoverable.
+sub read_config_file {
+       my $filename = shift;
+       return unless defined $filename;
+       # die if there are errors parsing config file
+       if (-e $filename) {
+               do $filename;
+               die $@ if $@;
+               return 1;
+       }
+       return;
+}
+
+our ($GITWEB_CONFIG, $GITWEB_CONFIG_SYSTEM, $GITWEB_CONFIG_COMMON);
+sub evaluate_gitweb_config {
+       our $GITWEB_CONFIG = $ENV{'GITWEB_CONFIG'} || "gitweb_config.perl";
+       our $GITWEB_CONFIG_SYSTEM = $ENV{'GITWEB_CONFIG_SYSTEM'} || "/etc/gitweb.conf";
+       our $GITWEB_CONFIG_COMMON = $ENV{'GITWEB_CONFIG_COMMON'} || "/etc/gitweb-common.conf";
+
+       # Protect against duplications of file names, to not read config twice.
+       # Only one of $GITWEB_CONFIG and $GITWEB_CONFIG_SYSTEM is used, so
+       # there possibility of duplication of filename there doesn't matter.
+       $GITWEB_CONFIG = ""        if ($GITWEB_CONFIG eq $GITWEB_CONFIG_COMMON);
+       $GITWEB_CONFIG_SYSTEM = "" if ($GITWEB_CONFIG_SYSTEM eq $GITWEB_CONFIG_COMMON);
+
+       # Common system-wide settings for convenience.
+       # Those settings can be ovverriden by GITWEB_CONFIG or GITWEB_CONFIG_SYSTEM.
+       read_config_file($GITWEB_CONFIG_COMMON);
+
+       # Use first config file that exists.  This means use the per-instance
+       # GITWEB_CONFIG if exists, otherwise use GITWEB_SYSTEM_CONFIG.
+       read_config_file($GITWEB_CONFIG) and return;
+       read_config_file($GITWEB_CONFIG_SYSTEM);
+}
+
+# Get loadavg of system, to compare against $maxload.
+# Currently it requires '/proc/loadavg' present to get loadavg;
+# if it is not present it returns 0, which means no load checking.
+sub get_loadavg {
+       if( -e '/proc/loadavg' ){
+               open my $fd, '<', '/proc/loadavg'
+                       or return 0;
+               my @load = split(/\s+/, scalar <$fd>);
+               close $fd;
+
+               # The first three columns measure CPU and IO utilization of the last one,
+               # five, and 10 minute periods.  The fourth column shows the number of
+               # currently running processes and the total number of processes in the m/n
+               # format.  The last column displays the last process ID used.
+               return $load[0] || 0;
+       }
+       # additional checks for load average should go here for things that don't export
+       # /proc/loadavg
+
+       return 0;
+}
+
+# version of the core git binary
+our $git_version;
+sub evaluate_git_version {
+       our $git_version = qx("$GIT" --version) =~ m/git version (.*)$/ ? $1 : "unknown";
+       $number_of_git_cmds++;
+}
+
+sub check_loadavg {
+       if (defined $maxload && get_loadavg() > $maxload) {
+               die_error(503, "The load average on the server is too high");
+       }
+}
+
+# ======================================================================
+# input validation and dispatch
+
+# input parameters can be collected from a variety of sources (presently, CGI
+# and PATH_INFO), so we define an %input_params hash that collects them all
+# together during validation: this allows subsequent uses (e.g. href()) to be
+# agnostic of the parameter origin
+
+our %input_params = ();
+
+# input parameters are stored with the long parameter name as key. This will
+# also be used in the href subroutine to convert parameters to their CGI
+# equivalent, and since the href() usage is the most frequent one, we store
+# the name -> CGI key mapping here, instead of the reverse.
+#
+# XXX: Warning: If you touch this, check the search form for updating,
+# too.
+
+our @cgi_param_mapping = (
+       project => "p",
+       action => "a",
+       file_name => "f",
+       file_parent => "fp",
+       hash => "h",
+       hash_parent => "hp",
+       hash_base => "hb",
+       hash_parent_base => "hpb",
+       page => "pg",
+       order => "o",
+       searchtext => "s",
+       searchtype => "st",
+       snapshot_format => "sf",
+       extra_options => "opt",
+       search_use_regexp => "sr",
+       ctag => "by_tag",
+       diff_style => "ds",
+       project_filter => "pf",
+       # this must be last entry (for manipulation from JavaScript)
+       javascript => "js"
+);
+our %cgi_param_mapping = @cgi_param_mapping;
+
+# we will also need to know the possible actions, for validation
+our %actions = (
+       "blame" => \&git_blame,
+       "blame_incremental" => \&git_blame_incremental,
+       "blame_data" => \&git_blame_data,
+       "blobdiff" => \&git_blobdiff,
+       "blobdiff_plain" => \&git_blobdiff_plain,
+       "blob" => \&git_blob,
+       "blob_plain" => \&git_blob_plain,
+       "commitdiff" => \&git_commitdiff,
+       "commitdiff_plain" => \&git_commitdiff_plain,
+       "commit" => \&git_commit,
+       "forks" => \&git_forks,
+       "heads" => \&git_heads,
+       "history" => \&git_history,
+       "log" => \&git_log,
+       "patch" => \&git_patch,
+       "patches" => \&git_patches,
+       "remotes" => \&git_remotes,
+       "rss" => \&git_rss,
+       "atom" => \&git_atom,
+       "search" => \&git_search,
+       "search_help" => \&git_search_help,
+       "shortlog" => \&git_shortlog,
+       "summary" => \&git_summary,
+       "tag" => \&git_tag,
+       "tags" => \&git_tags,
+       "tree" => \&git_tree,
+       "snapshot" => \&git_snapshot,
+       "object" => \&git_object,
+       # those below don't need $project
+       "opml" => \&git_opml,
+       "project_list" => \&git_project_list,
+       "project_index" => \&git_project_index,
+);
+
+# finally, we have the hash of allowed extra_options for the commands that
+# allow them
+our %allowed_options = (
+       "--no-merges" => [ qw(rss atom log shortlog history) ],
+);
+
+# fill %input_params with the CGI parameters. All values except for 'opt'
+# should be single values, but opt can be an array. We should probably
+# build an array of parameters that can be multi-valued, but since for the time
+# being it's only this one, we just single it out
+sub evaluate_query_params {
+       our $cgi;
+
+       while (my ($name, $symbol) = each %cgi_param_mapping) {
+               if ($symbol eq 'opt') {
+                       $input_params{$name} = [ map { decode_utf8($_) } $cgi->multi_param($symbol) ];
+               } else {
+                       $input_params{$name} = decode_utf8($cgi->param($symbol));
+               }
+       }
+}
+
+# now read PATH_INFO and update the parameter list for missing parameters
+sub evaluate_path_info {
+       return if defined $input_params{'project'};
+       return if !$path_info;
+       $path_info =~ s,^/+,,;
+       return if !$path_info;
+
+       # find which part of PATH_INFO is project
+       my $project = $path_info;
+       $project =~ s,/+$,,;
+       while ($project && !check_head_link("$projectroot/$project")) {
+               $project =~ s,/*[^/]*$,,;
+       }
+       return unless $project;
+       $input_params{'project'} = $project;
+
+       # do not change any parameters if an action is given using the query string
+       return if $input_params{'action'};
+       $path_info =~ s,^\Q$project\E/*,,;
+
+       # next, check if we have an action
+       my $action = $path_info;
+       $action =~ s,/.*$,,;
+       if (exists $actions{$action}) {
+               $path_info =~ s,^$action/*,,;
+               $input_params{'action'} = $action;
+       }
+
+       # list of actions that want hash_base instead of hash, but can have no
+       # pathname (f) parameter
+       my @wants_base = (
+               'tree',
+               'history',
+       );
+
+       # we want to catch, among others
+       # [$hash_parent_base[:$file_parent]..]$hash_parent[:$file_name]
+       my ($parentrefname, $parentpathname, $refname, $pathname) =
+               ($path_info =~ /^(?:(.+?)(?::(.+))?\.\.)?([^:]+?)?(?::(.+))?$/);
+
+       # first, analyze the 'current' part
+       if (defined $pathname) {
+               # we got "branch:filename" or "branch:dir/"
+               # we could use git_get_type(branch:pathname), but:
+               # - it needs $git_dir
+               # - it does a git() call
+               # - the convention of terminating directories with a slash
+               #   makes it superfluous
+               # - embedding the action in the PATH_INFO would make it even
+               #   more superfluous
+               $pathname =~ s,^/+,,;
+               if (!$pathname || substr($pathname, -1) eq "/") {
+                       $input_params{'action'} ||= "tree";
+                       $pathname =~ s,/$,,;
+               } else {
+                       # the default action depends on whether we had parent info
+                       # or not
+                       if ($parentrefname) {
+                               $input_params{'action'} ||= "blobdiff_plain";
+                       } else {
+                               $input_params{'action'} ||= "blob_plain";
+                       }
+               }
+               $input_params{'hash_base'} ||= $refname;
+               $input_params{'file_name'} ||= $pathname;
+       } elsif (defined $refname) {
+               # we got "branch". In this case we have to choose if we have to
+               # set hash or hash_base.
+               #
+               # Most of the actions without a pathname only want hash to be
+               # set, except for the ones specified in @wants_base that want
+               # hash_base instead. It should also be noted that hand-crafted
+               # links having 'history' as an action and no pathname or hash
+               # set will fail, but that happens regardless of PATH_INFO.
+               if (defined $parentrefname) {
+                       # if there is parent let the default be 'shortlog' action
+                       # (for http://git.example.com/repo.git/A..B links); if there
+                       # is no parent, dispatch will detect type of object and set
+                       # action appropriately if required (if action is not set)
+                       $input_params{'action'} ||= "shortlog";
+               }
+               if ($input_params{'action'} &&
+                   grep { $_ eq $input_params{'action'} } @wants_base) {
+                       $input_params{'hash_base'} ||= $refname;
+               } else {
+                       $input_params{'hash'} ||= $refname;
+               }
+       }
+
+       # next, handle the 'parent' part, if present
+       if (defined $parentrefname) {
+               # a missing pathspec defaults to the 'current' filename, allowing e.g.
+               # someproject/blobdiff/oldrev..newrev:/filename
+               if ($parentpathname) {
+                       $parentpathname =~ s,^/+,,;
+                       $parentpathname =~ s,/$,,;
+                       $input_params{'file_parent'} ||= $parentpathname;
+               } else {
+                       $input_params{'file_parent'} ||= $input_params{'file_name'};
+               }
+               # we assume that hash_parent_base is wanted if a path was specified,
+               # or if the action wants hash_base instead of hash
+               if (defined $input_params{'file_parent'} ||
+                       grep { $_ eq $input_params{'action'} } @wants_base) {
+                       $input_params{'hash_parent_base'} ||= $parentrefname;
+               } else {
+                       $input_params{'hash_parent'} ||= $parentrefname;
+               }
+       }
+
+       # for the snapshot action, we allow URLs in the form
+       # $project/snapshot/$hash.ext
+       # where .ext determines the snapshot and gets removed from the
+       # passed $refname to provide the $hash.
+       #
+       # To be able to tell that $refname includes the format extension, we
+       # require the following two conditions to be satisfied:
+       # - the hash input parameter MUST have been set from the $refname part
+       #   of the URL (i.e. they must be equal)
+       # - the snapshot format MUST NOT have been defined already (e.g. from
+       #   CGI parameter sf)
+       # It's also useless to try any matching unless $refname has a dot,
+       # so we check for that too
+       if (defined $input_params{'action'} &&
+               $input_params{'action'} eq 'snapshot' &&
+               defined $refname && index($refname, '.') != -1 &&
+               $refname eq $input_params{'hash'} &&
+               !defined $input_params{'snapshot_format'}) {
+               # We loop over the known snapshot formats, checking for
+               # extensions. Allowed extensions are both the defined suffix
+               # (which includes the initial dot already) and the snapshot
+               # format key itself, with a prepended dot
+               while (my ($fmt, $opt) = each %known_snapshot_formats) {
+                       my $hash = $refname;
+                       unless ($hash =~ s/(\Q$opt->{'suffix'}\E|\Q.$fmt\E)$//) {
+                               next;
+                       }
+                       my $sfx = $1;
+                       # a valid suffix was found, so set the snapshot format
+                       # and reset the hash parameter
+                       $input_params{'snapshot_format'} = $fmt;
+                       $input_params{'hash'} = $hash;
+                       # we also set the format suffix to the one requested
+                       # in the URL: this way a request for e.g. .tgz returns
+                       # a .tgz instead of a .tar.gz
+                       $known_snapshot_formats{$fmt}{'suffix'} = $sfx;
+                       last;
+               }
+       }
+}
+
+our ($action, $project, $file_name, $file_parent, $hash, $hash_parent, $hash_base,
+     $hash_parent_base, @extra_options, $page, $searchtype, $search_use_regexp,
+     $searchtext, $search_regexp, $project_filter);
+sub evaluate_and_validate_params {
+       our $action = $input_params{'action'};
+       if (defined $action) {
+               if (!is_valid_action($action)) {
+                       die_error(400, "Invalid action parameter");
+               }
+       }
+
+       # parameters which are pathnames
+       our $project = $input_params{'project'};
+       if (defined $project) {
+               if (!is_valid_project($project)) {
+                       undef $project;
+                       die_error(404, "No such project");
+               }
+       }
+
+       our $project_filter = $input_params{'project_filter'};
+       if (defined $project_filter) {
+               if (!is_valid_pathname($project_filter)) {
+                       die_error(404, "Invalid project_filter parameter");
+               }
+       }
+
+       our $file_name = $input_params{'file_name'};
+       if (defined $file_name) {
+               if (!is_valid_pathname($file_name)) {
+                       die_error(400, "Invalid file parameter");
+               }
+       }
+
+       our $file_parent = $input_params{'file_parent'};
+       if (defined $file_parent) {
+               if (!is_valid_pathname($file_parent)) {
+                       die_error(400, "Invalid file parent parameter");
+               }
+       }
+
+       # parameters which are refnames
+       our $hash = $input_params{'hash'};
+       if (defined $hash) {
+               if (!is_valid_refname($hash)) {
+                       die_error(400, "Invalid hash parameter");
+               }
+       }
+
+       our $hash_parent = $input_params{'hash_parent'};
+       if (defined $hash_parent) {
+               if (!is_valid_refname($hash_parent)) {
+                       die_error(400, "Invalid hash parent parameter");
+               }
+       }
+
+       our $hash_base = $input_params{'hash_base'};
+       if (defined $hash_base) {
+               if (!is_valid_refname($hash_base)) {
+                       die_error(400, "Invalid hash base parameter");
+               }
+       }
+
+       our @extra_options = @{$input_params{'extra_options'}};
+       # @extra_options is always defined, since it can only be (currently) set from
+       # CGI, and $cgi->param() returns the empty array in array context if the param
+       # is not set
+       foreach my $opt (@extra_options) {
+               if (not exists $allowed_options{$opt}) {
+                       die_error(400, "Invalid option parameter");
+               }
+               if (not grep(/^$action$/, @{$allowed_options{$opt}})) {
+                       die_error(400, "Invalid option parameter for this action");
+               }
+       }
+
+       our $hash_parent_base = $input_params{'hash_parent_base'};
+       if (defined $hash_parent_base) {
+               if (!is_valid_refname($hash_parent_base)) {
+                       die_error(400, "Invalid hash parent base parameter");
+               }
+       }
+
+       # other parameters
+       our $page = $input_params{'page'};
+       if (defined $page) {
+               if ($page =~ m/[^0-9]/) {
+                       die_error(400, "Invalid page parameter");
+               }
+       }
+
+       our $searchtype = $input_params{'searchtype'};
+       if (defined $searchtype) {
+               if ($searchtype =~ m/[^a-z]/) {
+                       die_error(400, "Invalid searchtype parameter");
+               }
+       }
+
+       our $search_use_regexp = $input_params{'search_use_regexp'};
+
+       our $searchtext = $input_params{'searchtext'};
+       our $search_regexp = undef;
+       if (defined $searchtext) {
+               if (length($searchtext) < 2) {
+                       die_error(403, "At least two characters are required for search parameter");
+               }
+               if ($search_use_regexp) {
+                       $search_regexp = $searchtext;
+                       if (!eval { qr/$search_regexp/; 1; }) {
+                               (my $error = $@) =~ s/ at \S+ line \d+.*\n?//;
+                               die_error(400, "Invalid search regexp '$search_regexp'",
+                                         esc_html($error));
+                       }
+               } else {
+                       $search_regexp = quotemeta $searchtext;
+               }
+       }
+}
+
+# path to the current git repository
+our $git_dir;
+sub evaluate_git_dir {
+       our $git_dir = "$projectroot/$project" if $project;
+}
+
+our (@snapshot_fmts, $git_avatar, @extra_branch_refs);
+sub configure_gitweb_features {
+       # list of supported snapshot formats
+       our @snapshot_fmts = gitweb_get_feature('snapshot');
+       @snapshot_fmts = filter_snapshot_fmts(@snapshot_fmts);
+
+       # check that the avatar feature is set to a known provider name,
+       # and for each provider check if the dependencies are satisfied.
+       # if the provider name is invalid or the dependencies are not met,
+       # reset $git_avatar to the empty string.
+       our ($git_avatar) = gitweb_get_feature('avatar');
+       if ($git_avatar eq 'gravatar') {
+               $git_avatar = '' unless (eval { require Digest::MD5; 1; });
+       } elsif ($git_avatar eq 'picon') {
+               # no dependencies
+       } else {
+               $git_avatar = '';
+       }
+
+       our @extra_branch_refs = gitweb_get_feature('extra-branch-refs');
+       @extra_branch_refs = filter_and_validate_refs (@extra_branch_refs);
+}
+
+sub get_branch_refs {
+       return ('heads', @extra_branch_refs);
+}
+
+# custom error handler: 'die <message>' is Internal Server Error
+sub handle_errors_html {
+       my $msg = shift; # it is already HTML escaped
+
+       # to avoid infinite loop where error occurs in die_error,
+       # change handler to default handler, disabling handle_errors_html
+       set_message("Error occurred when inside die_error:\n$msg");
+
+       # you cannot jump out of die_error when called as error handler;
+       # the subroutine set via CGI::Carp::set_message is called _after_
+       # HTTP headers are already written, so it cannot write them itself
+       die_error(undef, undef, $msg, -error_handler => 1, -no_http_header => 1);
+}
+set_message(\&handle_errors_html);
+
+# dispatch
+sub dispatch {
+       if (!defined $action) {
+               if (defined $hash) {
+                       $action = git_get_type($hash);
+                       $action or die_error(404, "Object does not exist");
+               } elsif (defined $hash_base && defined $file_name) {
+                       $action = git_get_type("$hash_base:$file_name");
+                       $action or die_error(404, "File or directory does not exist");
+               } elsif (defined $project) {
+                       $action = 'summary';
+               } else {
+                       $action = 'project_list';
+               }
+       }
+       if (!defined($actions{$action})) {
+               die_error(400, "Unknown action");
+       }
+       if ($action !~ m/^(?:opml|project_list|project_index)$/ &&
+           !$project) {
+               die_error(400, "Project needed");
+       }
+       $actions{$action}->();
+}
+
+sub reset_timer {
+       our $t0 = [ gettimeofday() ]
+               if defined $t0;
+       our $number_of_git_cmds = 0;
+}
+
+our $first_request = 1;
+sub run_request {
+       reset_timer();
+
+       evaluate_uri();
+       if ($first_request) {
+               evaluate_gitweb_config();
+               evaluate_git_version();
+       }
+       if ($per_request_config) {
+               if (ref($per_request_config) eq 'CODE') {
+                       $per_request_config->();
+               } elsif (!$first_request) {
+                       evaluate_gitweb_config();
+               }
+       }
+       check_loadavg();
+
+       # $projectroot and $projects_list might be set in gitweb config file
+       $projects_list ||= $projectroot;
+
+       evaluate_query_params();
+       evaluate_path_info();
+       evaluate_and_validate_params();
+       evaluate_git_dir();
+
+       configure_gitweb_features();
+
+       dispatch();
+}
+
+our $is_last_request = sub { 1 };
+our ($pre_dispatch_hook, $post_dispatch_hook, $pre_listen_hook);
+our $CGI = 'CGI';
+our $cgi;
+sub configure_as_fcgi {
+       require CGI::Fast;
+       our $CGI = 'CGI::Fast';
+
+       my $request_number = 0;
+       # let each child service 100 requests
+       our $is_last_request = sub { ++$request_number > 100 };
+}
+sub evaluate_argv {
+       my $script_name = $ENV{'SCRIPT_NAME'} || $ENV{'SCRIPT_FILENAME'} || __FILE__;
+       configure_as_fcgi()
+               if $script_name =~ /\.fcgi$/;
+
+       return unless (@ARGV);
+
+       require Getopt::Long;
+       Getopt::Long::GetOptions(
+               'fastcgi|fcgi|f' => \&configure_as_fcgi,
+               'nproc|n=i' => sub {
+                       my ($arg, $val) = @_;
+                       return unless eval { require FCGI::ProcManager; 1; };
+                       my $proc_manager = FCGI::ProcManager->new({
+                               n_processes => $val,
+                       });
+                       our $pre_listen_hook    = sub { $proc_manager->pm_manage()        };
+                       our $pre_dispatch_hook  = sub { $proc_manager->pm_pre_dispatch()  };
+                       our $post_dispatch_hook = sub { $proc_manager->pm_post_dispatch() };
+               },
+       );
+}
+
+sub run {
+       evaluate_argv();
+
+       $first_request = 1;
+       $pre_listen_hook->()
+               if $pre_listen_hook;
+
+ REQUEST:
+       while ($cgi = $CGI->new()) {
+               $pre_dispatch_hook->()
+                       if $pre_dispatch_hook;
+
+               run_request();
+
+               $post_dispatch_hook->()
+                       if $post_dispatch_hook;
+               $first_request = 0;
+
+               last REQUEST if ($is_last_request->());
+       }
+
+ DONE_GITWEB:
+       1;
+}
+
+run();
+
+if (defined caller) {
+       # wrapped in a subroutine processing requests,
+       # e.g. mod_perl with ModPerl::Registry, or PSGI with Plack::App::WrapCGI
+       return;
+} else {
+       # pure CGI script, serving single request
+       exit;
+}
+
+## ======================================================================
+## action links
+
+# possible values of extra options
+# -full => 0|1      - use absolute/full URL ($my_uri/$my_url as base)
+# -replay => 1      - start from a current view (replay with modifications)
+# -path_info => 0|1 - don't use/use path_info URL (if possible)
+# -anchor => ANCHOR - add #ANCHOR to end of URL, implies -replay if used alone
+sub href {
+       my %params = @_;
+       # default is to use -absolute url() i.e. $my_uri
+       my $href = $params{-full} ? $my_url : $my_uri;
+
+       # implicit -replay, must be first of implicit params
+       $params{-replay} = 1 if (keys %params == 1 && $params{-anchor});
+
+       $params{'project'} = $project unless exists $params{'project'};
+
+       if ($params{-replay}) {
+               while (my ($name, $symbol) = each %cgi_param_mapping) {
+                       if (!exists $params{$name}) {
+                               $params{$name} = $input_params{$name};
+                       }
+               }
+       }
+
+       my $use_pathinfo = gitweb_check_feature('pathinfo');
+       if (defined $params{'project'} &&
+           (exists $params{-path_info} ? $params{-path_info} : $use_pathinfo)) {
+               # try to put as many parameters as possible in PATH_INFO:
+               #   - project name
+               #   - action
+               #   - hash_parent or hash_parent_base:/file_parent
+               #   - hash or hash_base:/filename
+               #   - the snapshot_format as an appropriate suffix
+
+               # When the script is the root DirectoryIndex for the domain,
+               # $href here would be something like http://gitweb.example.com/
+               # Thus, we strip any trailing / from $href, to spare us double
+               # slashes in the final URL
+               $href =~ s,/$,,;
+
+               # Then add the project name, if present
+               $href .= "/".esc_path_info($params{'project'});
+               delete $params{'project'};
+
+               # since we destructively absorb parameters, we keep this
+               # boolean that remembers if we're handling a snapshot
+               my $is_snapshot = $params{'action'} eq 'snapshot';
+
+               # Summary just uses the project path URL, any other action is
+               # added to the URL
+               if (defined $params{'action'}) {
+                       $href .= "/".esc_path_info($params{'action'})
+                               unless $params{'action'} eq 'summary';
+                       delete $params{'action'};
+               }
+
+               # Next, we put hash_parent_base:/file_parent..hash_base:/file_name,
+               # stripping nonexistent or useless pieces
+               $href .= "/" if ($params{'hash_base'} || $params{'hash_parent_base'}
+                       || $params{'hash_parent'} || $params{'hash'});
+               if (defined $params{'hash_base'}) {
+                       if (defined $params{'hash_parent_base'}) {
+                               $href .= esc_path_info($params{'hash_parent_base'});
+                               # skip the file_parent if it's the same as the file_name
+                               if (defined $params{'file_parent'}) {
+                                       if (defined $params{'file_name'} && $params{'file_parent'} eq $params{'file_name'}) {
+                                               delete $params{'file_parent'};
+                                       } elsif ($params{'file_parent'} !~ /\.\./) {
+                                               $href .= ":/".esc_path_info($params{'file_parent'});
+                                               delete $params{'file_parent'};
+                                       }
+                               }
+                               $href .= "..";
+                               delete $params{'hash_parent'};
+                               delete $params{'hash_parent_base'};
+                       } elsif (defined $params{'hash_parent'}) {
+                               $href .= esc_path_info($params{'hash_parent'}). "..";
+                               delete $params{'hash_parent'};
+                       }
+
+                       $href .= esc_path_info($params{'hash_base'});
+                       if (defined $params{'file_name'} && $params{'file_name'} !~ /\.\./) {
+                               $href .= ":/".esc_path_info($params{'file_name'});
+                               delete $params{'file_name'};
+                       }
+                       delete $params{'hash'};
+                       delete $params{'hash_base'};
+               } elsif (defined $params{'hash'}) {
+                       $href .= esc_path_info($params{'hash'});
+                       delete $params{'hash'};
+               }
+
+               # If the action was a snapshot, we can absorb the
+               # snapshot_format parameter too
+               if ($is_snapshot) {
+                       my $fmt = $params{'snapshot_format'};
+                       # snapshot_format should always be defined when href()
+                       # is called, but just in case some code forgets, we
+                       # fall back to the default
+                       $fmt ||= $snapshot_fmts[0];
+                       $href .= $known_snapshot_formats{$fmt}{'suffix'};
+                       delete $params{'snapshot_format'};
+               }
+       }
+
+       # now encode the parameters explicitly
+       my @result = ();
+       for (my $i = 0; $i < @cgi_param_mapping; $i += 2) {
+               my ($name, $symbol) = ($cgi_param_mapping[$i], $cgi_param_mapping[$i+1]);
+               if (defined $params{$name}) {
+                       if (ref($params{$name}) eq "ARRAY") {
+                               foreach my $par (@{$params{$name}}) {
+                                       push @result, $symbol . "=" . esc_param($par);
+                               }
+                       } else {
+                               push @result, $symbol . "=" . esc_param($params{$name});
+                       }
+               }
+       }
+       $href .= "?" . join(';', @result) if scalar @result;
+
+       # final transformation: trailing spaces must be escaped (URI-encoded)
+       $href =~ s/(\s+)$/CGI::escape($1)/e;
+
+       if ($params{-anchor}) {
+               $href .= "#".esc_param($params{-anchor});
+       }
+
+       return $href;
+}
+
+
+## ======================================================================
+## validation, quoting/unquoting and escaping
+
+sub is_valid_action {
+       my $input = shift;
+       return undef unless exists $actions{$input};
+       return 1;
+}
+
+sub is_valid_project {
+       my $input = shift;
+
+       return unless defined $input;
+       if (!is_valid_pathname($input) ||
+               !(-d "$projectroot/$input") ||
+               !check_export_ok("$projectroot/$input") ||
+               ($strict_export && !project_in_list($input))) {
+               return undef;
+       } else {
+               return 1;
+       }
+}
+
+sub is_valid_pathname {
+       my $input = shift;
+
+       return undef unless defined $input;
+       # no '.' or '..' as elements of path, i.e. no '.' or '..'
+       # at the beginning, at the end, and between slashes.
+       # also this catches doubled slashes
+       if ($input =~ m!(^|/)(|\.|\.\.)(/|$)!) {
+               return undef;
+       }
+       # no null characters
+       if ($input =~ m!\0!) {
+               return undef;
+       }
+       return 1;
+}
+
+sub is_valid_ref_format {
+       my $input = shift;
+
+       return undef unless defined $input;
+       # restrictions on ref name according to git-check-ref-format
+       if ($input =~ m!(/\.|\.\.|[\000-\040\177 ~^:?*\[]|/$)!) {
+               return undef;
+       }
+       return 1;
+}
+
+sub is_valid_refname {
+       my $input = shift;
+
+       return undef unless defined $input;
+       # textual hashes are O.K.
+       if ($input =~ m/^[0-9a-fA-F]{40}$/) {
+               return 1;
+       }
+       # it must be correct pathname
+       is_valid_pathname($input) or return undef;
+       # check git-check-ref-format restrictions
+       is_valid_ref_format($input) or return undef;
+       return 1;
+}
+
+# decode sequences of octets in utf8 into Perl's internal form,
+# which is utf-8 with utf8 flag set if needed.  gitweb writes out
+# in utf-8 thanks to "binmode STDOUT, ':utf8'" at beginning
+sub to_utf8 {
+       my $str = shift;
+       return undef unless defined $str;
+
+       if (utf8::is_utf8($str) || utf8::decode($str)) {
+               return $str;
+       } else {
+               return decode($fallback_encoding, $str, Encode::FB_DEFAULT);
+       }
+}
+
+# quote unsafe chars, but keep the slash, even when it's not
+# correct, but quoted slashes look too horrible in bookmarks
+sub esc_param {
+       my $str = shift;
+       return undef unless defined $str;
+       $str =~ s/([^A-Za-z0-9\-_.~()\/:@ ]+)/CGI::escape($1)/eg;
+       $str =~ s/ /\+/g;
+       return $str;
+}
+
+# the quoting rules for path_info fragment are slightly different
+sub esc_path_info {
+       my $str = shift;
+       return undef unless defined $str;
+
+       # path_info doesn't treat '+' as space (specially), but '?' must be escaped
+       $str =~ s/([^A-Za-z0-9\-_.~();\/;:@&= +]+)/CGI::escape($1)/eg;
+
+       return $str;
+}
+
+# quote unsafe chars in whole URL, so some characters cannot be quoted
+sub esc_url {
+       my $str = shift;
+       return undef unless defined $str;
+       $str =~ s/([^A-Za-z0-9\-_.~();\/;?:@&= ]+)/CGI::escape($1)/eg;
+       $str =~ s/ /\+/g;
+       return $str;
+}
+
+# quote unsafe characters in HTML attributes
+sub esc_attr {
+
+       # for XHTML conformance escaping '"' to '&quot;' is not enough
+       return esc_html(@_);
+}
+
+# replace invalid utf8 character with SUBSTITUTION sequence
+sub esc_html {
+       my $str = shift;
+       my %opts = @_;
+
+       return undef unless defined $str;
+
+       $str = to_utf8($str);
+       $str = $cgi->escapeHTML($str);
+       if ($opts{'-nbsp'}) {
+               $str =~ s/ /&nbsp;/g;
+       }
+       $str =~ s|([[:cntrl:]])|(($1 ne "\t") ? quot_cec($1) : $1)|eg;
+       return $str;
+}
+
+# quote control characters and escape filename to HTML
+sub esc_path {
+       my $str = shift;
+       my %opts = @_;
+
+       return undef unless defined $str;
+
+       $str = to_utf8($str);
+       $str = $cgi->escapeHTML($str);
+       if ($opts{'-nbsp'}) {
+               $str =~ s/ /&nbsp;/g;
+       }
+       $str =~ s|([[:cntrl:]])|quot_cec($1)|eg;
+       return $str;
+}
+
+# Sanitize for use in XHTML + application/xml+xhtm (valid XML 1.0)
+sub sanitize {
+       my $str = shift;
+
+       return undef unless defined $str;
+
+       $str = to_utf8($str);
+       $str =~ s|([[:cntrl:]])|(index("\t\n\r", $1) != -1 ? $1 : quot_cec($1))|eg;
+       return $str;
+}
+
+# Make control characters "printable", using character escape codes (CEC)
+sub quot_cec {
+       my $cntrl = shift;
+       my %opts = @_;
+       my %es = ( # character escape codes, aka escape sequences
+               "\t" => '\t',   # tab            (HT)
+               "\n" => '\n',   # line feed      (LF)
+               "\r" => '\r',   # carrige return (CR)
+               "\f" => '\f',   # form feed      (FF)
+               "\b" => '\b',   # backspace      (BS)
+               "\a" => '\a',   # alarm (bell)   (BEL)
+               "\e" => '\e',   # escape         (ESC)
+               "\013" => '\v', # vertical tab   (VT)
+               "\000" => '\0', # nul character  (NUL)
+       );
+       my $chr = ( (exists $es{$cntrl})
+                   ? $es{$cntrl}
+                   : sprintf('\%2x', ord($cntrl)) );
+       if ($opts{-nohtml}) {
+               return $chr;
+       } else {
+               return "<span class=\"cntrl\">$chr</span>";
+       }
+}
+
+# Alternatively use unicode control pictures codepoints,
+# Unicode "printable representation" (PR)
+sub quot_upr {
+       my $cntrl = shift;
+       my %opts = @_;
+
+       my $chr = sprintf('&#%04d;', 0x2400+ord($cntrl));
+       if ($opts{-nohtml}) {
+               return $chr;
+       } else {
+               return "<span class=\"cntrl\">$chr</span>";
+       }
+}
+
+# git may return quoted and escaped filenames
+sub unquote {
+       my $str = shift;
+
+       sub unq {
+               my $seq = shift;
+               my %es = ( # character escape codes, aka escape sequences
+                       't' => "\t",   # tab            (HT, TAB)
+                       'n' => "\n",   # newline        (NL)
+                       'r' => "\r",   # return         (CR)
+                       'f' => "\f",   # form feed      (FF)
+                       'b' => "\b",   # backspace      (BS)
+                       'a' => "\a",   # alarm (bell)   (BEL)
+                       'e' => "\e",   # escape         (ESC)
+                       'v' => "\013", # vertical tab   (VT)
+               );
+
+               if ($seq =~ m/^[0-7]{1,3}$/) {
+                       # octal char sequence
+                       return chr(oct($seq));
+               } elsif (exists $es{$seq}) {
+                       # C escape sequence, aka character escape code
+                       return $es{$seq};
+               }
+               # quoted ordinary character
+               return $seq;
+       }
+
+       if ($str =~ m/^"(.*)"$/) {
+               # needs unquoting
+               $str = $1;
+               $str =~ s/\\([^0-7]|[0-7]{1,3})/unq($1)/eg;
+       }
+       return $str;
+}
+
+# escape tabs (convert tabs to spaces)
+sub untabify {
+       my $line = shift;
+
+       while ((my $pos = index($line, "\t")) != -1) {
+               if (my $count = (8 - ($pos % 8))) {
+                       my $spaces = ' ' x $count;
+                       $line =~ s/\t/$spaces/;
+               }
+       }
+
+       return $line;
+}
+
+sub project_in_list {
+       my $project = shift;
+       my @list = git_get_projects_list();
+       return @list && scalar(grep { $_->{'path'} eq $project } @list);
+}
+
+## ----------------------------------------------------------------------
+## HTML aware string manipulation
+
+# Try to chop given string on a word boundary between position
+# $len and $len+$add_len. If there is no word boundary there,
+# chop at $len+$add_len. Do not chop if chopped part plus ellipsis
+# (marking chopped part) would be longer than given string.
+sub chop_str {
+       my $str = shift;
+       my $len = shift;
+       my $add_len = shift || 10;
+       my $where = shift || 'right'; # 'left' | 'center' | 'right'
+
+       # Make sure perl knows it is utf8 encoded so we don't
+       # cut in the middle of a utf8 multibyte char.
+       $str = to_utf8($str);
+
+       # 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
+       # remove chopped character entities entirely
+
+       # when chopping in the middle, distribute $len into left and right part
+       # return early if chopping wouldn't make string shorter
+       if ($where eq 'center') {
+               return $str if ($len + 5 >= length($str)); # filler is length 5
+               $len = int($len/2);
+       } else {
+               return $str if ($len + 4 >= length($str)); # filler is length 4
+       }
+
+       # regexps: ending and beginning with word part up to $add_len
+       my $endre = qr/.{$len}\w{0,$add_len}/;
+       my $begre = qr/\w{0,$add_len}.{$len}/;
+
+       if ($where eq 'left') {
+               $str =~ m/^(.*?)($begre)$/;
+               my ($lead, $body) = ($1, $2);
+               if (length($lead) > 4) {
+                       $lead = " ...";
+               }
+               return "$lead$body";
+
+       } elsif ($where eq 'center') {
+               $str =~ m/^($endre)(.*)$/;
+               my ($left, $str)  = ($1, $2);
+               $str =~ m/^(.*?)($begre)$/;
+               my ($mid, $right) = ($1, $2);
+               if (length($mid) > 5) {
+                       $mid = " ... ";
+               }
+               return "$left$mid$right";
+
+       } else {
+               $str =~ m/^($endre)(.*)$/;
+               my $body = $1;
+               my $tail = $2;
+               if (length($tail) > 4) {
+                       $tail = "... ";
+               }
+               return "$body$tail";
+       }
+}
+
+# takes the same arguments as chop_str, but also wraps a <span> around the
+# result with a title attribute if it does get chopped. Additionally, the
+# string is HTML-escaped.
+sub chop_and_escape_str {
+       my ($str) = @_;
+
+       my $chopped = chop_str(@_);
+       $str = to_utf8($str);
+       if ($chopped eq $str) {
+               return esc_html($chopped);
+       } else {
+               $str =~ s/[[:cntrl:]]/?/g;
+               return $cgi->span({-title=>$str}, esc_html($chopped));
+       }
+}
+
+# Highlight selected fragments of string, using given CSS class,
+# and escape HTML.  It is assumed that fragments do not overlap.
+# Regions are passed as list of pairs (array references).
+#
+# Example: esc_html_hl_regions("foobar", "mark", [ 0, 3 ]) returns
+# '<span class="mark">foo</span>bar'
+sub esc_html_hl_regions {
+       my ($str, $css_class, @sel) = @_;
+       my %opts = grep { ref($_) ne 'ARRAY' } @sel;
+       @sel     = grep { ref($_) eq 'ARRAY' } @sel;
+       return esc_html($str, %opts) unless @sel;
+
+       my $out = '';
+       my $pos = 0;
+
+       for my $s (@sel) {
+               my ($begin, $end) = @$s;
+
+               # Don't create empty <span> elements.
+               next if $end <= $begin;
+
+               my $escaped = esc_html(substr($str, $begin, $end - $begin),
+                                      %opts);
+
+               $out .= esc_html(substr($str, $pos, $begin - $pos), %opts)
+                       if ($begin - $pos > 0);
+               $out .= $cgi->span({-class => $css_class}, $escaped);
+
+               $pos = $end;
+       }
+       $out .= esc_html(substr($str, $pos), %opts)
+               if ($pos < length($str));
+
+       return $out;
+}
+
+# return positions of beginning and end of each match
+sub matchpos_list {
+       my ($str, $regexp) = @_;
+       return unless (defined $str && defined $regexp);
+
+       my @matches;
+       while ($str =~ /$regexp/g) {
+               push @matches, [$-[0], $+[0]];
+       }
+       return @matches;
+}
+
+# highlight match (if any), and escape HTML
+sub esc_html_match_hl {
+       my ($str, $regexp) = @_;
+       return esc_html($str) unless defined $regexp;
+
+       my @matches = matchpos_list($str, $regexp);
+       return esc_html($str) unless @matches;
+
+       return esc_html_hl_regions($str, 'match', @matches);
+}
+
+
+# highlight match (if any) of shortened string, and escape HTML
+sub esc_html_match_hl_chopped {
+       my ($str, $chopped, $regexp) = @_;
+       return esc_html_match_hl($str, $regexp) unless defined $chopped;
+
+       my @matches = matchpos_list($str, $regexp);
+       return esc_html($chopped) unless @matches;
+
+       # filter matches so that we mark chopped string
+       my $tail = "... "; # see chop_str
+       unless ($chopped =~ s/\Q$tail\E$//) {
+               $tail = '';
+       }
+       my $chop_len = length($chopped);
+       my $tail_len = length($tail);
+       my @filtered;
+
+       for my $m (@matches) {
+               if ($m->[0] > $chop_len) {
+                       push @filtered, [ $chop_len, $chop_len + $tail_len ] if ($tail_len > 0);
+                       last;
+               } elsif ($m->[1] > $chop_len) {
+                       push @filtered, [ $m->[0], $chop_len + $tail_len ];
+                       last;
+               }
+               push @filtered, $m;
+       }
+
+       return esc_html_hl_regions($chopped . $tail, 'match', @filtered);
+}
+
+## ----------------------------------------------------------------------
+## functions returning short strings
+
+# CSS class for given age value (in seconds)
+sub age_class {
+       my $age = shift;
+
+       if (!defined $age) {
+               return "noage";
+       } elsif ($age < 60*60*2) {
+               return "age0";
+       } elsif ($age < 60*60*24*2) {
+               return "age1";
+       } else {
+               return "age2";
+       }
+}
+
+# convert age in seconds to "nn units ago" string
+sub age_string {
+       my $age = shift;
+       my $age_str;
+
+       if ($age > 60*60*24*365*2) {
+               $age_str = (int $age/60/60/24/365);
+               $age_str .= " years ago";
+       } elsif ($age > 60*60*24*(365/12)*2) {
+               $age_str = int $age/60/60/24/(365/12);
+               $age_str .= " months ago";
+       } elsif ($age > 60*60*24*7*2) {
+               $age_str = int $age/60/60/24/7;
+               $age_str .= " weeks ago";
+       } elsif ($age > 60*60*24*2) {
+               $age_str = int $age/60/60/24;
+               $age_str .= " days ago";
+       } elsif ($age > 60*60*2) {
+               $age_str = int $age/60/60;
+               $age_str .= " hours ago";
+       } elsif ($age > 60*2) {
+               $age_str = int $age/60;
+               $age_str .= " min ago";
+       } elsif ($age > 2) {
+               $age_str = int $age;
+               $age_str .= " sec ago";
+       } else {
+               $age_str .= " right now";
+       }
+       return $age_str;
+}
+
+use constant {
+       S_IFINVALID => 0030000,
+       S_IFGITLINK => 0160000,
+};
+
+# submodule/subproject, a commit object reference
+sub S_ISGITLINK {
+       my $mode = shift;
+
+       return (($mode & S_IFMT) == S_IFGITLINK)
+}
+
+# convert file mode in octal to symbolic file mode string
+sub mode_str {
+       my $mode = oct shift;
+
+       if (S_ISGITLINK($mode)) {
+               return 'm---------';
+       } elsif (S_ISDIR($mode & S_IFMT)) {
+               return 'drwxr-xr-x';
+       } elsif (S_ISLNK($mode)) {
+               return 'lrwxrwxrwx';
+       } elsif (S_ISREG($mode)) {
+               # git cares only about the executable bit
+               if ($mode & S_IXUSR) {
+                       return '-rwxr-xr-x';
+               } else {
+                       return '-rw-r--r--';
+               };
+       } else {
+               return '----------';
+       }
+}
+
+# convert file mode in octal to file type string
+sub file_type {
+       my $mode = shift;
+
+       if ($mode !~ m/^[0-7]+$/) {
+               return $mode;
+       } else {
+               $mode = oct $mode;
+       }
+
+       if (S_ISGITLINK($mode)) {
+               return "submodule";
+       } elsif (S_ISDIR($mode & S_IFMT)) {
+               return "directory";
+       } elsif (S_ISLNK($mode)) {
+               return "symlink";
+       } elsif (S_ISREG($mode)) {
+               return "file";
+       } else {
+               return "unknown";
+       }
+}
+
+# convert file mode in octal to file type description string
+sub file_type_long {
+       my $mode = shift;
+
+       if ($mode !~ m/^[0-7]+$/) {
+               return $mode;
+       } else {
+               $mode = oct $mode;
+       }
+
+       if (S_ISGITLINK($mode)) {
+               return "submodule";
+       } elsif (S_ISDIR($mode & S_IFMT)) {
+               return "directory";
+       } elsif (S_ISLNK($mode)) {
+               return "symlink";
+       } elsif (S_ISREG($mode)) {
+               if ($mode & S_IXUSR) {
+                       return "executable";
+               } else {
+                       return "file";
+               };
+       } else {
+               return "unknown";
+       }
+}
+
+
+## ----------------------------------------------------------------------
+## functions returning short HTML fragments, or transforming HTML fragments
+## which don't belong to other sections
+
+# format line of commit message.
+sub format_log_line_html {
+       my $line = shift;
+
+       $line = esc_html($line, -nbsp=>1);
+       $line =~ s{\b([0-9a-fA-F]{8,40})\b}{
+               $cgi->a({-href => href(action=>"object", hash=>$1),
+                                       -class => "text"}, $1);
+       }eg;
+
+       return $line;
+}
+
+# format marker of refs pointing to given object
+
+# the destination action is chosen based on object type and current context:
+# - for annotated tags, we choose the tag view unless it's the current view
+#   already, in which case we go to shortlog view
+# - for other refs, we keep the current view if we're in history, shortlog or
+#   log view, and select shortlog otherwise
+sub format_ref_marker {
+       my ($refs, $id) = @_;
+       my $markers = '';
+
+       if (defined $refs->{$id}) {
+               foreach my $ref (@{$refs->{$id}}) {
+                       # this code exploits the fact that non-lightweight tags are the
+                       # only indirect objects, and that they are the only objects for which
+                       # we want to use tag instead of shortlog as action
+                       my ($type, $name) = qw();
+                       my $indirect = ($ref =~ s/\^\{\}$//);
+                       # e.g. tags/v2.6.11 or heads/next
+                       if ($ref =~ m!^(.*?)s?/(.*)$!) {
+                               $type = $1;
+                               $name = $2;
+                       } else {
+                               $type = "ref";
+                               $name = $ref;
+                       }
+
+                       my $class = $type;
+                       $class .= " indirect" if $indirect;
+
+                       my $dest_action = "shortlog";
+
+                       if ($indirect) {
+                               $dest_action = "tag" unless $action eq "tag";
+                       } elsif ($action =~ /^(history|(short)?log)$/) {
+                               $dest_action = $action;
+                       }
+
+                       my $dest = "";
+                       $dest .= "refs/" unless $ref =~ m!^refs/!;
+                       $dest .= $ref;
+
+                       my $link = $cgi->a({
+                               -href => href(
+                                       action=>$dest_action,
+                                       hash=>$dest
+                               )}, $name);
+
+                       $markers .= " <span class=\"".esc_attr($class)."\" title=\"".esc_attr($ref)."\">" .
+                               $link . "</span>";
+               }
+       }
+
+       if ($markers) {
+               return ' <span class="refs">'. $markers . '</span>';
+       } else {
+               return "";
+       }
+}
+
+# format, perhaps shortened and with markers, title line
+sub format_subject_html {
+       my ($long, $short, $href, $extra) = @_;
+       $extra = '' unless defined($extra);
+
+       if (length($short) < length($long)) {
+               $long =~ s/[[:cntrl:]]/?/g;
+               return $cgi->a({-href => $href, -class => "list subject",
+                               -title => to_utf8($long)},
+                      esc_html($short)) . $extra;
+       } else {
+               return $cgi->a({-href => $href, -class => "list subject"},
+                      esc_html($long)) . $extra;
+       }
+}
+
+# Rather than recomputing the url for an email multiple times, we cache it
+# after the first hit. This gives a visible benefit in views where the avatar
+# for the same email is used repeatedly (e.g. shortlog).
+# The cache is shared by all avatar engines (currently gravatar only), which
+# are free to use it as preferred. Since only one avatar engine is used for any
+# given page, there's no risk for cache conflicts.
+our %avatar_cache = ();
+
+# Compute the picon url for a given email, by using the picon search service over at
+# http://www.cs.indiana.edu/picons/search.html
+sub picon_url {
+       my $email = lc shift;
+       if (!$avatar_cache{$email}) {
+               my ($user, $domain) = split('@', $email);
+               $avatar_cache{$email} =
+                       "//www.cs.indiana.edu/cgi-pub/kinzler/piconsearch.cgi/" .
+                       "$domain/$user/" .
+                       "users+domains+unknown/up/single";
+       }
+       return $avatar_cache{$email};
+}
+
+# Compute the gravatar url for a given email, if it's not in the cache already.
+# Gravatar stores only the part of the URL before the size, since that's the
+# one computationally more expensive. This also allows reuse of the cache for
+# different sizes (for this particular engine).
+sub gravatar_url {
+       my $email = lc shift;
+       my $size = shift;
+       $avatar_cache{$email} ||=
+               "//www.gravatar.com/avatar/" .
+                       Digest::MD5::md5_hex($email) . "?s=";
+       return $avatar_cache{$email} . $size;
+}
+
+# Insert an avatar for the given $email at the given $size if the feature
+# is enabled.
+sub git_get_avatar {
+       my ($email, %opts) = @_;
+       my $pre_white  = ($opts{-pad_before} ? "&nbsp;" : "");
+       my $post_white = ($opts{-pad_after}  ? "&nbsp;" : "");
+       $opts{-size} ||= 'default';
+       my $size = $avatar_size{$opts{-size}} || $avatar_size{'default'};
+       my $url = "";
+       if ($git_avatar eq 'gravatar') {
+               $url = gravatar_url($email, $size);
+       } elsif ($git_avatar eq 'picon') {
+               $url = picon_url($email);
+       }
+       # Other providers can be added by extending the if chain, defining $url
+       # as needed. If no variant puts something in $url, we assume avatars
+       # are completely disabled/unavailable.
+       if ($url) {
+               return $pre_white .
+                      "<img width=\"$size\" " .
+                           "class=\"avatar\" " .
+                           "src=\"".esc_url($url)."\" " .
+                           "alt=\"\" " .
+                      "/>" . $post_white;
+       } else {
+               return "";
+       }
+}
+
+sub format_search_author {
+       my ($author, $searchtype, $displaytext) = @_;
+       my $have_search = gitweb_check_feature('search');
+
+       if ($have_search) {
+               my $performed = "";
+               if ($searchtype eq 'author') {
+                       $performed = "authored";
+               } elsif ($searchtype eq 'committer') {
+                       $performed = "committed";
+               }
+
+               return $cgi->a({-href => href(action=>"search", hash=>$hash,
+                               searchtext=>$author,
+                               searchtype=>$searchtype), class=>"list",
+                               title=>"Search for commits $performed by $author"},
+                               $displaytext);
+
+       } else {
+               return $displaytext;
+       }
+}
+
+# format the author name of the given commit with the given tag
+# the author name is chopped and escaped according to the other
+# optional parameters (see chop_str).
+sub format_author_html {
+       my $tag = shift;
+       my $co = shift;
+       my $author = chop_and_escape_str($co->{'author_name'}, @_);
+       return "<$tag class=\"author\">" .
+              format_search_author($co->{'author_name'}, "author",
+                      git_get_avatar($co->{'author_email'}, -pad_after => 1) .
+                      $author) .
+              "</$tag>";
+}
+
+# format git diff header line, i.e. "diff --(git|combined|cc) ..."
+sub format_git_diff_header_line {
+       my $line = shift;
+       my $diffinfo = shift;
+       my ($from, $to) = @_;
+
+       if ($diffinfo->{'nparents'}) {
+               # combined diff
+               $line =~ s!^(diff (.*?) )"?.*$!$1!;
+               if ($to->{'href'}) {
+                       $line .= $cgi->a({-href => $to->{'href'}, -class => "path"},
+                                        esc_path($to->{'file'}));
+               } else { # file was deleted (no href)
+                       $line .= esc_path($to->{'file'});
+               }
+       } else {
+               # "ordinary" diff
+               $line =~ s!^(diff (.*?) )"?a/.*$!$1!;
+               if ($from->{'href'}) {
+                       $line .= $cgi->a({-href => $from->{'href'}, -class => "path"},
+                                        'a/' . esc_path($from->{'file'}));
+               } else { # file was added (no href)
+                       $line .= 'a/' . esc_path($from->{'file'});
+               }
+               $line .= ' ';
+               if ($to->{'href'}) {
+                       $line .= $cgi->a({-href => $to->{'href'}, -class => "path"},
+                                        'b/' . esc_path($to->{'file'}));
+               } else { # file was deleted
+                       $line .= 'b/' . esc_path($to->{'file'});
+               }
+       }
+
+       return "<div class=\"diff header\">$line</div>\n";
+}
+
+# format extended diff header line, before patch itself
+sub format_extended_diff_header_line {
+       my $line = shift;
+       my $diffinfo = shift;
+       my ($from, $to) = @_;
+
+       # match <path>
+       if ($line =~ s!^((copy|rename) from ).*$!$1! && $from->{'href'}) {
+               $line .= $cgi->a({-href=>$from->{'href'}, -class=>"path"},
+                                      esc_path($from->{'file'}));
+       }
+       if ($line =~ s!^((copy|rename) to ).*$!$1! && $to->{'href'}) {
+               $line .= $cgi->a({-href=>$to->{'href'}, -class=>"path"},
+                                esc_path($to->{'file'}));
+       }
+       # match single <mode>
+       if ($line =~ m/\s(\d{6})$/) {
+               $line .= '<span class="info"> (' .
+                        file_type_long($1) .
+                        ')</span>';
+       }
+       # match <hash>
+       if ($line =~ m/^index [0-9a-fA-F]{40},[0-9a-fA-F]{40}/) {
+               # can match only for combined diff
+               $line = 'index ';
+               for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
+                       if ($from->{'href'}[$i]) {
+                               $line .= $cgi->a({-href=>$from->{'href'}[$i],
+                                                 -class=>"hash"},
+                                                substr($diffinfo->{'from_id'}[$i],0,7));
+                       } else {
+                               $line .= '0' x 7;
+                       }
+                       # separator
+                       $line .= ',' if ($i < $diffinfo->{'nparents'} - 1);
+               }
+               $line .= '..';
+               if ($to->{'href'}) {
+                       $line .= $cgi->a({-href=>$to->{'href'}, -class=>"hash"},
+                                        substr($diffinfo->{'to_id'},0,7));
+               } else {
+                       $line .= '0' x 7;
+               }
+
+       } elsif ($line =~ m/^index [0-9a-fA-F]{40}..[0-9a-fA-F]{40}/) {
+               # can match only for ordinary diff
+               my ($from_link, $to_link);
+               if ($from->{'href'}) {
+                       $from_link = $cgi->a({-href=>$from->{'href'}, -class=>"hash"},
+                                            substr($diffinfo->{'from_id'},0,7));
+               } else {
+                       $from_link = '0' x 7;
+               }
+               if ($to->{'href'}) {
+                       $to_link = $cgi->a({-href=>$to->{'href'}, -class=>"hash"},
+                                          substr($diffinfo->{'to_id'},0,7));
+               } else {
+                       $to_link = '0' x 7;
+               }
+               my ($from_id, $to_id) = ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
+               $line =~ s!$from_id\.\.$to_id!$from_link..$to_link!;
+       }
+
+       return $line . "<br/>\n";
+}
+
+# format from-file/to-file diff header
+sub format_diff_from_to_header {
+       my ($from_line, $to_line, $diffinfo, $from, $to, @parents) = @_;
+       my $line;
+       my $result = '';
+
+       $line = $from_line;
+       #assert($line =~ m/^---/) if DEBUG;
+       # no extra formatting for "^--- /dev/null"
+       if (! $diffinfo->{'nparents'}) {
+               # ordinary (single parent) diff
+               if ($line =~ m!^--- "?a/!) {
+                       if ($from->{'href'}) {
+                               $line = '--- a/' .
+                                       $cgi->a({-href=>$from->{'href'}, -class=>"path"},
+                                               esc_path($from->{'file'}));
+                       } else {
+                               $line = '--- a/' .
+                                       esc_path($from->{'file'});
+                       }
+               }
+               $result .= qq!<div class="diff from_file">$line</div>\n!;
+
+       } else {
+               # combined diff (merge commit)
+               for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
+                       if ($from->{'href'}[$i]) {
+                               $line = '--- ' .
+                                       $cgi->a({-href=>href(action=>"blobdiff",
+                                                            hash_parent=>$diffinfo->{'from_id'}[$i],
+                                                            hash_parent_base=>$parents[$i],
+                                                            file_parent=>$from->{'file'}[$i],
+                                                            hash=>$diffinfo->{'to_id'},
+                                                            hash_base=>$hash,
+                                                            file_name=>$to->{'file'}),
+                                                -class=>"path",
+                                                -title=>"diff" . ($i+1)},
+                                               $i+1) .
+                                       '/' .
+                                       $cgi->a({-href=>$from->{'href'}[$i], -class=>"path"},
+                                               esc_path($from->{'file'}[$i]));
+                       } else {
+                               $line = '--- /dev/null';
+                       }
+                       $result .= qq!<div class="diff from_file">$line</div>\n!;
+               }
+       }
+
+       $line = $to_line;
+       #assert($line =~ m/^\+\+\+/) if DEBUG;
+       # no extra formatting for "^+++ /dev/null"
+       if ($line =~ m!^\+\+\+ "?b/!) {
+               if ($to->{'href'}) {
+                       $line = '+++ b/' .
+                               $cgi->a({-href=>$to->{'href'}, -class=>"path"},
+                                       esc_path($to->{'file'}));
+               } else {
+                       $line = '+++ b/' .
+                               esc_path($to->{'file'});
+               }
+       }
+       $result .= qq!<div class="diff to_file">$line</div>\n!;
+
+       return $result;
+}
+
+# create note for patch simplified by combined diff
+sub format_diff_cc_simplified {
+       my ($diffinfo, @parents) = @_;
+       my $result = '';
+
+       $result .= "<div class=\"diff header\">" .
+                  "diff --cc ";
+       if (!is_deleted($diffinfo)) {
+               $result .= $cgi->a({-href => href(action=>"blob",
+                                                 hash_base=>$hash,
+                                                 hash=>$diffinfo->{'to_id'},
+                                                 file_name=>$diffinfo->{'to_file'}),
+                                   -class => "path"},
+                                  esc_path($diffinfo->{'to_file'}));
+       } else {
+               $result .= esc_path($diffinfo->{'to_file'});
+       }
+       $result .= "</div>\n" . # class="diff header"
+                  "<div class=\"diff nodifferences\">" .
+                  "Simple merge" .
+                  "</div>\n"; # class="diff nodifferences"
+
+       return $result;
+}
+
+sub diff_line_class {
+       my ($line, $from, $to) = @_;
+
+       # ordinary diff
+       my $num_sign = 1;
+       # combined diff
+       if ($from && $to && ref($from->{'href'}) eq "ARRAY") {
+               $num_sign = scalar @{$from->{'href'}};
+       }
+
+       my @diff_line_classifier = (
+               { regexp => qr/^\@\@{$num_sign} /, class => "chunk_header"},
+               { regexp => qr/^\\/,               class => "incomplete"  },
+               { regexp => qr/^ {$num_sign}/,     class => "ctx" },
+               # classifier for context must come before classifier add/rem,
+               # or we would have to use more complicated regexp, for example
+               # qr/(?= {0,$m}\+)[+ ]{$num_sign}/, where $m = $num_sign - 1;
+               { regexp => qr/^[+ ]{$num_sign}/,   class => "add" },
+               { regexp => qr/^[- ]{$num_sign}/,   class => "rem" },
+       );
+       for my $clsfy (@diff_line_classifier) {
+               return $clsfy->{'class'}
+                       if ($line =~ $clsfy->{'regexp'});
+       }
+
+       # fallback
+       return "";
+}
+
+# assumes that $from and $to are defined and correctly filled,
+# and that $line holds a line of chunk header for unified diff
+sub format_unidiff_chunk_header {
+       my ($line, $from, $to) = @_;
+
+       my ($from_text, $from_start, $from_lines, $to_text, $to_start, $to_lines, $section) =
+               $line =~ m/^\@{2} (-(\d+)(?:,(\d+))?) (\+(\d+)(?:,(\d+))?) \@{2}(.*)$/;
+
+       $from_lines = 0 unless defined $from_lines;
+       $to_lines   = 0 unless defined $to_lines;
+
+       if ($from->{'href'}) {
+               $from_text = $cgi->a({-href=>"$from->{'href'}#l$from_start",
+                                    -class=>"list"}, $from_text);
+       }
+       if ($to->{'href'}) {
+               $to_text   = $cgi->a({-href=>"$to->{'href'}#l$to_start",
+                                    -class=>"list"}, $to_text);
+       }
+       $line = "<span class=\"chunk_info\">@@ $from_text $to_text @@</span>" .
+               "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
+       return $line;
+}
+
+# assumes that $from and $to are defined and correctly filled,
+# and that $line holds a line of chunk header for combined diff
+sub format_cc_diff_chunk_header {
+       my ($line, $from, $to) = @_;
+
+       my ($prefix, $ranges, $section) = $line =~ m/^(\@+) (.*?) \@+(.*)$/;
+       my (@from_text, @from_start, @from_nlines, $to_text, $to_start, $to_nlines);
+
+       @from_text = split(' ', $ranges);
+       for (my $i = 0; $i < @from_text; ++$i) {
+               ($from_start[$i], $from_nlines[$i]) =
+                       (split(',', substr($from_text[$i], 1)), 0);
+       }
+
+       $to_text   = pop @from_text;
+       $to_start  = pop @from_start;
+       $to_nlines = pop @from_nlines;
+
+       $line = "<span class=\"chunk_info\">$prefix ";
+       for (my $i = 0; $i < @from_text; ++$i) {
+               if ($from->{'href'}[$i]) {
+                       $line .= $cgi->a({-href=>"$from->{'href'}[$i]#l$from_start[$i]",
+                                         -class=>"list"}, $from_text[$i]);
+               } else {
+                       $line .= $from_text[$i];
+               }
+               $line .= " ";
+       }
+       if ($to->{'href'}) {
+               $line .= $cgi->a({-href=>"$to->{'href'}#l$to_start",
+                                 -class=>"list"}, $to_text);
+       } else {
+               $line .= $to_text;
+       }
+       $line .= " $prefix</span>" .
+                "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
+       return $line;
+}
+
+# process patch (diff) line (not to be used for diff headers),
+# returning HTML-formatted (but not wrapped) line.
+# If the line is passed as a reference, it is treated as HTML and not
+# esc_html()'ed.
+sub format_diff_line {
+       my ($line, $diff_class, $from, $to) = @_;
+
+       if (ref($line)) {
+               $line = $$line;
+       } else {
+               chomp $line;
+               $line = untabify($line);
+
+               if ($from && $to && $line =~ m/^\@{2} /) {
+                       $line = format_unidiff_chunk_header($line, $from, $to);
+               } elsif ($from && $to && $line =~ m/^\@{3}/) {
+                       $line = format_cc_diff_chunk_header($line, $from, $to);
+               } else {
+                       $line = esc_html($line, -nbsp=>1);
+               }
+       }
+
+       my $diff_classes = "diff";
+       $diff_classes .= " $diff_class" if ($diff_class);
+       $line = "<div class=\"$diff_classes\">$line</div>\n";
+
+       return $line;
+}
+
+# Generates undef or something like "_snapshot_" or "snapshot (_tbz2_ _zip_)",
+# linked.  Pass the hash of the tree/commit to snapshot.
+sub format_snapshot_links {
+       my ($hash) = @_;
+       my $num_fmts = @snapshot_fmts;
+       if ($num_fmts > 1) {
+               # A parenthesized list of links bearing format names.
+               # e.g. "snapshot (_tar.gz_ _zip_)"
+               return "snapshot (" . join(' ', map
+                       $cgi->a({
+                               -href => href(
+                                       action=>"snapshot",
+                                       hash=>$hash,
+                                       snapshot_format=>$_
+                               )
+                       }, $known_snapshot_formats{$_}{'display'})
+               , @snapshot_fmts) . ")";
+       } elsif ($num_fmts == 1) {
+               # A single "snapshot" link whose tooltip bears the format name.
+               # i.e. "_snapshot_"
+               my ($fmt) = @snapshot_fmts;
+               return
+                       $cgi->a({
+                               -href => href(
+                                       action=>"snapshot",
+                                       hash=>$hash,
+                                       snapshot_format=>$fmt
+                               ),
+                               -title => "in format: $known_snapshot_formats{$fmt}{'display'}"
+                       }, "snapshot");
+       } else { # $num_fmts == 0
+               return undef;
+       }
+}
+
+## ......................................................................
+## functions returning values to be passed, perhaps after some
+## transformation, to other functions; e.g. returning arguments to href()
+
+# returns hash to be passed to href to generate gitweb URL
+# in -title key it returns description of link
+sub get_feed_info {
+       my $format = shift || 'Atom';
+       my %res = (action => lc($format));
+       my $matched_ref = 0;
+
+       # feed links are possible only for project views
+       return unless (defined $project);
+       # some views should link to OPML, or to generic project feed,
+       # or don't have specific feed yet (so they should use generic)
+       return if (!$action || $action =~ /^(?:tags|heads|forks|tag|search)$/x);
+
+       my $branch = undef;
+       # branches refs uses 'refs/' + $get_branch_refs()[x] + '/' prefix
+       # (fullname) to differentiate from tag links; this also makes
+       # possible to detect branch links
+       for my $ref (get_branch_refs()) {
+               if ((defined $hash_base && $hash_base =~ m!^refs/\Q$ref\E/(.*)$!) ||
+                   (defined $hash      && $hash      =~ m!^refs/\Q$ref\E/(.*)$!)) {
+                       $branch = $1;
+                       $matched_ref = $ref;
+                       last;
+               }
+       }
+       # find log type for feed description (title)
+       my $type = 'log';
+       if (defined $file_name) {
+               $type  = "history of $file_name";
+               $type .= "/" if ($action eq 'tree');
+               $type .= " on '$branch'" if (defined $branch);
+       } else {
+               $type = "log of $branch" if (defined $branch);
+       }
+
+       $res{-title} = $type;
+       $res{'hash'} = (defined $branch ? "refs/$matched_ref/$branch" : undef);
+       $res{'file_name'} = $file_name;
+
+       return %res;
+}
+
+## ----------------------------------------------------------------------
+## git utility subroutines, invoking git commands
+
+# returns path to the core git executable and the --git-dir parameter as list
+sub git_cmd {
+       $number_of_git_cmds++;
+       return $GIT, '--git-dir='.$git_dir;
+}
+
+# quote the given arguments for passing them to the shell
+# quote_command("command", "arg 1", "arg with ' and ! characters")
+# => "'command' 'arg 1' 'arg with '\'' and '\!' characters'"
+# Try to avoid using this function wherever possible.
+sub quote_command {
+       return join(' ',
+               map { my $a = $_; $a =~ s/(['!])/'\\$1'/g; "'$a'" } @_ );
+}
+
+# get HEAD ref of given project as hash
+sub git_get_head_hash {
+       return git_get_full_hash(shift, 'HEAD');
+}
+
+sub git_get_full_hash {
+       return git_get_hash(@_);
+}
+
+sub git_get_short_hash {
+       return git_get_hash(@_, '--short=7');
+}
+
+sub git_get_hash {
+       my ($project, $hash, @options) = @_;
+       my $o_git_dir = $git_dir;
+       my $retval = undef;
+       $git_dir = "$projectroot/$project";
+       if (open my $fd, '-|', git_cmd(), 'rev-parse',
+           '--verify', '-q', @options, $hash) {
+               $retval = <$fd>;
+               chomp $retval if defined $retval;
+               close $fd;
+       }
+       if (defined $o_git_dir) {
+               $git_dir = $o_git_dir;
+       }
+       return $retval;
+}
+
+# get type of given object
+sub git_get_type {
+       my $hash = shift;
+
+       open my $fd, "-|", git_cmd(), "cat-file", '-t', $hash or return;
+       my $type = <$fd>;
+       close $fd or return;
+       chomp $type;
+       return $type;
+}
+
+# repository configuration
+our $config_file = '';
+our %config;
+
+# store multiple values for single key as anonymous array reference
+# single values stored directly in the hash, not as [ <value> ]
+sub hash_set_multi {
+       my ($hash, $key, $value) = @_;
+
+       if (!exists $hash->{$key}) {
+               $hash->{$key} = $value;
+       } elsif (!ref $hash->{$key}) {
+               $hash->{$key} = [ $hash->{$key}, $value ];
+       } else {
+               push @{$hash->{$key}}, $value;
+       }
+}
+
+# return hash of git project configuration
+# optionally limited to some section, e.g. 'gitweb'
+sub git_parse_project_config {
+       my $section_regexp = shift;
+       my %config;
+
+       local $/ = "\0";
+
+       open my $fh, "-|", git_cmd(), "config", '-z', '-l',
+               or return;
+
+       while (my $keyval = <$fh>) {
+               chomp $keyval;
+               my ($key, $value) = split(/\n/, $keyval, 2);
+
+               hash_set_multi(\%config, $key, $value)
+                       if (!defined $section_regexp || $key =~ /^(?:$section_regexp)\./o);
+       }
+       close $fh;
+
+       return %config;
+}
+
+# convert config value to boolean: 'true' or 'false'
+# no value, number > 0, 'true' and 'yes' values are true
+# rest of values are treated as false (never as error)
+sub config_to_bool {
+       my $val = shift;
+
+       return 1 if !defined $val;             # section.key
+
+       # strip leading and trailing whitespace
+       $val =~ s/^\s+//;
+       $val =~ s/\s+$//;
+
+       return (($val =~ /^\d+$/ && $val) ||   # section.key = 1
+               ($val =~ /^(?:true|yes)$/i));  # section.key = true
+}
+
+# convert config value to simple decimal number
+# an optional value suffix of 'k', 'm', or 'g' will cause the value
+# to be multiplied by 1024, 1048576, or 1073741824
+sub config_to_int {
+       my $val = shift;
+
+       # strip leading and trailing whitespace
+       $val =~ s/^\s+//;
+       $val =~ s/\s+$//;
+
+       if (my ($num, $unit) = ($val =~ /^([0-9]*)([kmg])$/i)) {
+               $unit = lc($unit);
+               # unknown unit is treated as 1
+               return $num * ($unit eq 'g' ? 1073741824 :
+                              $unit eq 'm' ?    1048576 :
+                              $unit eq 'k' ?       1024 : 1);
+       }
+       return $val;
+}
+
+# convert config value to array reference, if needed
+sub config_to_multi {
+       my $val = shift;
+
+       return ref($val) ? $val : (defined($val) ? [ $val ] : []);
+}
+
+sub git_get_project_config {
+       my ($key, $type) = @_;
+
+       return unless defined $git_dir;
+
+       # key sanity check
+       return unless ($key);
+       # only subsection, if exists, is case sensitive,
+       # and not lowercased by 'git config -z -l'
+       if (my ($hi, $mi, $lo) = ($key =~ /^([^.]*)\.(.*)\.([^.]*)$/)) {
+               $lo =~ s/_//g;
+               $key = join(".", lc($hi), $mi, lc($lo));
+               return if ($lo =~ /\W/ || $hi =~ /\W/);
+       } else {
+               $key = lc($key);
+               $key =~ s/_//g;
+               return if ($key =~ /\W/);
+       }
+       $key =~ s/^gitweb\.//;
+
+       # type sanity check
+       if (defined $type) {
+               $type =~ s/^--//;
+               $type = undef
+                       unless ($type eq 'bool' || $type eq 'int');
+       }
+
+       # get config
+       if (!defined $config_file ||
+           $config_file ne "$git_dir/config") {
+               %config = git_parse_project_config('gitweb');
+               $config_file = "$git_dir/config";
+       }
+
+       # check if config variable (key) exists
+       return unless exists $config{"gitweb.$key"};
+
+       # ensure given type
+       if (!defined $type) {
+               return $config{"gitweb.$key"};
+       } elsif ($type eq 'bool') {
+               # backward compatibility: 'git config --bool' returns true/false
+               return config_to_bool($config{"gitweb.$key"}) ? 'true' : 'false';
+       } elsif ($type eq 'int') {
+               return config_to_int($config{"gitweb.$key"});
+       }
+       return $config{"gitweb.$key"};
+}
+
+# get hash of given path at given ref
+sub git_get_hash_by_path {
+       my $base = shift;
+       my $path = shift || return undef;
+       my $type = shift;
+
+       $path =~ s,/+$,,;
+
+       open my $fd, "-|", git_cmd(), "ls-tree", $base, "--", $path
+               or die_error(500, "Open git-ls-tree failed");
+       my $line = <$fd>;
+       close $fd or return undef;
+
+       if (!defined $line) {
+               # there is no tree or hash given by $path at $base
+               return undef;
+       }
+
+       #'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa  panic.c'
+       $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t/;
+       if (defined $type && $type ne $2) {
+               # type doesn't match
+               return undef;
+       }
+       return $3;
+}
+
+# get path of entry with given hash at given tree-ish (ref)
+# used to get 'from' filename for combined diff (merge commit) for renames
+sub git_get_path_by_hash {
+       my $base = shift || return;
+       my $hash = shift || return;
+
+       local $/ = "\0";
+
+       open my $fd, "-|", git_cmd(), "ls-tree", '-r', '-t', '-z', $base
+               or return undef;
+       while (my $line = <$fd>) {
+               chomp $line;
+
+               #'040000 tree 595596a6a9117ddba9fe379b6b012b558bac8423  gitweb'
+               #'100644 blob e02e90f0429be0d2a69b76571101f20b8f75530f  gitweb/README'
+               if ($line =~ m/(?:[0-9]+) (?:.+) $hash\t(.+)$/) {
+                       close $fd;
+                       return $1;
+               }
+       }
+       close $fd;
+       return undef;
+}
+
+## ......................................................................
+## git utility functions, directly accessing git repository
+
+# get the value of config variable either from file named as the variable
+# itself in the repository ($GIT_DIR/$name file), or from gitweb.$name
+# configuration variable in the repository config file.
+sub git_get_file_or_project_config {
+       my ($path, $name) = @_;
+
+       $git_dir = "$projectroot/$path";
+       open my $fd, '<', "$git_dir/$name"
+               or return git_get_project_config($name);
+       my $conf = <$fd>;
+       close $fd;
+       if (defined $conf) {
+               chomp $conf;
+       }
+       return $conf;
+}
+
+sub git_get_project_description {
+       my $path = shift;
+       return git_get_file_or_project_config($path, 'description');
+}
+
+sub git_get_project_category {
+       my $path = shift;
+       return git_get_file_or_project_config($path, 'category');
+}
+
+
+# supported formats:
+# * $GIT_DIR/ctags/<tagname> file (in 'ctags' subdirectory)
+#   - if its contents is a number, use it as tag weight,
+#   - otherwise add a tag with weight 1
+# * $GIT_DIR/ctags file, each line is a tag (with weight 1)
+#   the same value multiple times increases tag weight
+# * `gitweb.ctag' multi-valued repo config variable
+sub git_get_project_ctags {
+       my $project = shift;
+       my $ctags = {};
+
+       $git_dir = "$projectroot/$project";
+       if (opendir my $dh, "$git_dir/ctags") {
+               my @files = grep { -f $_ } map { "$git_dir/ctags/$_" } readdir($dh);
+               foreach my $tagfile (@files) {
+                       open my $ct, '<', $tagfile
+                               or next;
+                       my $val = <$ct>;
+                       chomp $val if $val;
+                       close $ct;
+
+                       (my $ctag = $tagfile) =~ s#.*/##;
+                       if ($val =~ /^\d+$/) {
+                               $ctags->{$ctag} = $val;
+                       } else {
+                               $ctags->{$ctag} = 1;
+                       }
+               }
+               closedir $dh;
+
+       } elsif (open my $fh, '<', "$git_dir/ctags") {
+               while (my $line = <$fh>) {
+                       chomp $line;
+                       $ctags->{$line}++ if $line;
+               }
+               close $fh;
+
+       } else {
+               my $taglist = config_to_multi(git_get_project_config('ctag'));
+               foreach my $tag (@$taglist) {
+                       $ctags->{$tag}++;
+               }
+       }
+
+       return $ctags;
+}
+
+# return hash, where keys are content tags ('ctags'),
+# and values are sum of weights of given tag in every project
+sub git_gather_all_ctags {
+       my $projects = shift;
+       my $ctags = {};
+
+       foreach my $p (@$projects) {
+               foreach my $ct (keys %{$p->{'ctags'}}) {
+                       $ctags->{$ct} += $p->{'ctags'}->{$ct};
+               }
+       }
+
+       return $ctags;
+}
+
+sub git_populate_project_tagcloud {
+       my $ctags = shift;
+
+       # First, merge different-cased tags; tags vote on casing
+       my %ctags_lc;
+       foreach (keys %$ctags) {
+               $ctags_lc{lc $_}->{count} += $ctags->{$_};
+               if (not $ctags_lc{lc $_}->{topcount}
+                   or $ctags_lc{lc $_}->{topcount} < $ctags->{$_}) {
+                       $ctags_lc{lc $_}->{topcount} = $ctags->{$_};
+                       $ctags_lc{lc $_}->{topname} = $_;
+               }
+       }
+
+       my $cloud;
+       my $matched = $input_params{'ctag'};
+       if (eval { require HTML::TagCloud; 1; }) {
+               $cloud = HTML::TagCloud->new;
+               foreach my $ctag (sort keys %ctags_lc) {
+                       # Pad the title with spaces so that the cloud looks
+                       # less crammed.
+                       my $title = esc_html($ctags_lc{$ctag}->{topname});
+                       $title =~ s/ /&nbsp;/g;
+                       $title =~ s/^/&nbsp;/g;
+                       $title =~ s/$/&nbsp;/g;
+                       if (defined $matched && $matched eq $ctag) {
+                               $title = qq(<span class="match">$title</span>);
+                       }
+                       $cloud->add($title, href(project=>undef, ctag=>$ctag),
+                                   $ctags_lc{$ctag}->{count});
+               }
+       } else {
+               $cloud = {};
+               foreach my $ctag (keys %ctags_lc) {
+                       my $title = esc_html($ctags_lc{$ctag}->{topname}, -nbsp=>1);
+                       if (defined $matched && $matched eq $ctag) {
+                               $title = qq(<span class="match">$title</span>);
+                       }
+                       $cloud->{$ctag}{count} = $ctags_lc{$ctag}->{count};
+                       $cloud->{$ctag}{ctag} =
+                               $cgi->a({-href=>href(project=>undef, ctag=>$ctag)}, $title);
+               }
+       }
+       return $cloud;
+}
+
+sub git_show_project_tagcloud {
+       my ($cloud, $count) = @_;
+       if (ref $cloud eq 'HTML::TagCloud') {
+               return $cloud->html_and_css($count);
+       } else {
+               my @tags = sort { $cloud->{$a}->{'count'} <=> $cloud->{$b}->{'count'} } keys %$cloud;
+               return
+                       '<div id="htmltagcloud"'.($project ? '' : ' align="center"').'>' .
+                       join (', ', map {
+                               $cloud->{$_}->{'ctag'}
+                       } splice(@tags, 0, $count)) .
+                       '</div>';
+       }
+}
+
+sub git_get_project_url_list {
+       my $path = shift;
+
+       $git_dir = "$projectroot/$path";
+       open my $fd, '<', "$git_dir/cloneurl"
+               or return wantarray ?
+               @{ config_to_multi(git_get_project_config('url')) } :
+                  config_to_multi(git_get_project_config('url'));
+       my @git_project_url_list = map { chomp; $_ } <$fd>;
+       close $fd;
+
+       return wantarray ? @git_project_url_list : \@git_project_url_list;
+}
+
+sub git_get_projects_list {
+       my $filter = shift || '';
+       my $paranoid = shift;
+       my @list;
+
+       if (-d $projects_list) {
+               # search in directory
+               my $dir = $projects_list;
+               # remove the trailing "/"
+               $dir =~ s!/+$!!;
+               my $pfxlen = length("$dir");
+               my $pfxdepth = ($dir =~ tr!/!!);
+               # when filtering, search only given subdirectory
+               if ($filter && !$paranoid) {
+                       $dir .= "/$filter";
+                       $dir =~ s!/+$!!;
+               }
+
+               File::Find::find({
+                       follow_fast => 1, # follow symbolic links
+                       follow_skip => 2, # ignore duplicates
+                       dangling_symlinks => 0, # ignore dangling symlinks, silently
+                       wanted => sub {
+                               # global variables
+                               our $project_maxdepth;
+                               our $projectroot;
+                               # skip project-list toplevel, if we get it.
+                               return if (m!^[/.]$!);
+                               # only directories can be git repositories
+                               return unless (-d $_);
+                               # don't traverse too deep (Find is super slow on os x)
+                               # $project_maxdepth excludes depth of $projectroot
+                               if (($File::Find::name =~ tr!/!!) - $pfxdepth > $project_maxdepth) {
+                                       $File::Find::prune = 1;
+                                       return;
+                               }
+
+                               my $path = substr($File::Find::name, $pfxlen + 1);
+                               # paranoidly only filter here
+                               if ($paranoid && $filter && $path !~ m!^\Q$filter\E/!) {
+                                       next;
+                               }
+                               # we check related file in $projectroot
+                               if (check_export_ok("$projectroot/$path")) {
+                                       push @list, { path => $path };
+                                       $File::Find::prune = 1;
+                               }
+                       },
+               }, "$dir");
+
+       } elsif (-f $projects_list) {
+               # read from file(url-encoded):
+               # 'git%2Fgit.git Linus+Torvalds'
+               # 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
+               # 'linux%2Fhotplug%2Fudev.git Greg+Kroah-Hartman'
+               open my $fd, '<', $projects_list or return;
+       PROJECT:
+               while (my $line = <$fd>) {
+                       chomp $line;
+                       my ($path, $owner) = split ' ', $line;
+                       $path = unescape($path);
+                       $owner = unescape($owner);
+                       if (!defined $path) {
+                               next;
+                       }
+                       # if $filter is rpovided, check if $path begins with $filter
+                       if ($filter && $path !~ m!^\Q$filter\E/!) {
+                               next;
+                       }
+                       if (check_export_ok("$projectroot/$path")) {
+                               my $pr = {
+                                       path => $path
+                               };
+                               if ($owner) {
+                                       $pr->{'owner'} = to_utf8($owner);
+                               }
+                               push @list, $pr;
+                       }
+               }
+               close $fd;
+       }
+       return @list;
+}
+
+# written with help of Tree::Trie module (Perl Artistic License, GPL compatibile)
+# as side effects it sets 'forks' field to list of forks for forked projects
+sub filter_forks_from_projects_list {
+       my $projects = shift;
+
+       my %trie; # prefix tree of directories (path components)
+       # generate trie out of those directories that might contain forks
+       foreach my $pr (@$projects) {
+               my $path = $pr->{'path'};
+               $path =~ s/\.git$//;      # forks of 'repo.git' are in 'repo/' directory
+               next if ($path =~ m!/$!); # skip non-bare repositories, e.g. 'repo/.git'
+               next unless ($path);      # skip '.git' repository: tests, git-instaweb
+               next unless (-d "$projectroot/$path"); # containing directory exists
+               $pr->{'forks'} = [];      # there can be 0 or more forks of project
+
+               # add to trie
+               my @dirs = split('/', $path);
+               # walk the trie, until either runs out of components or out of trie
+               my $ref = \%trie;
+               while (scalar @dirs &&
+                      exists($ref->{$dirs[0]})) {
+                       $ref = $ref->{shift @dirs};
+               }
+               # create rest of trie structure from rest of components
+               foreach my $dir (@dirs) {
+                       $ref = $ref->{$dir} = {};
+               }
+               # create end marker, store $pr as a data
+               $ref->{''} = $pr if (!exists $ref->{''});
+       }
+
+       # filter out forks, by finding shortest prefix match for paths
+       my @filtered;
+ PROJECT:
+       foreach my $pr (@$projects) {
+               # trie lookup
+               my $ref = \%trie;
+       DIR:
+               foreach my $dir (split('/', $pr->{'path'})) {
+                       if (exists $ref->{''}) {
+                               # found [shortest] prefix, is a fork - skip it
+                               push @{$ref->{''}{'forks'}}, $pr;
+                               next PROJECT;
+                       }
+                       if (!exists $ref->{$dir}) {
+                               # not in trie, cannot have prefix, not a fork
+                               push @filtered, $pr;
+                               next PROJECT;
+                       }
+                       # If the dir is there, we just walk one step down the trie.
+                       $ref = $ref->{$dir};
+               }
+               # we ran out of trie
+               # (shouldn't happen: it's either no match, or end marker)
+               push @filtered, $pr;
+       }
+
+       return @filtered;
+}
+
+# note: fill_project_list_info must be run first,
+# for 'descr_long' and 'ctags' to be filled
+sub search_projects_list {
+       my ($projlist, %opts) = @_;
+       my $tagfilter  = $opts{'tagfilter'};
+       my $search_re = $opts{'search_regexp'};
+
+       return @$projlist
+               unless ($tagfilter || $search_re);
+
+       # searching projects require filling to be run before it;
+       fill_project_list_info($projlist,
+                              $tagfilter  ? 'ctags' : (),
+                              $search_re ? ('path', 'descr') : ());
+       my @projects;
+ PROJECT:
+       foreach my $pr (@$projlist) {
+
+               if ($tagfilter) {
+                       next unless ref($pr->{'ctags'}) eq 'HASH';
+                       next unless
+                               grep { lc($_) eq lc($tagfilter) } keys %{$pr->{'ctags'}};
+               }
+
+               if ($search_re) {
+                       next unless
+                               $pr->{'path'} =~ /$search_re/ ||
+                               $pr->{'descr_long'} =~ /$search_re/;
+               }
+
+               push @projects, $pr;
+       }
+
+       return @projects;
+}
+
+our $gitweb_project_owner = undef;
+sub git_get_project_list_from_file {
+
+       return if (defined $gitweb_project_owner);
+
+       $gitweb_project_owner = {};
+       # read from file (url-encoded):
+       # 'git%2Fgit.git Linus+Torvalds'
+       # 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
+       # 'linux%2Fhotplug%2Fudev.git Greg+Kroah-Hartman'
+       if (-f $projects_list) {
+               open(my $fd, '<', $projects_list);
+               while (my $line = <$fd>) {
+                       chomp $line;
+                       my ($pr, $ow) = split ' ', $line;
+                       $pr = unescape($pr);
+                       $ow = unescape($ow);
+                       $gitweb_project_owner->{$pr} = to_utf8($ow);
+               }
+               close $fd;
+       }
+}
+
+sub git_get_project_owner {
+       my $project = shift;
+       my $owner;
+
+       return undef unless $project;
+       $git_dir = "$projectroot/$project";
+
+       if (!defined $gitweb_project_owner) {
+               git_get_project_list_from_file();
+       }
+
+       if (exists $gitweb_project_owner->{$project}) {
+               $owner = $gitweb_project_owner->{$project};
+       }
+       if (!defined $owner){
+               $owner = git_get_project_config('owner');
+       }
+       if (!defined $owner) {
+               $owner = get_file_owner("$git_dir");
+       }
+
+       return $owner;
+}
+
+sub git_get_last_activity {
+       my ($path) = @_;
+       my $fd;
+
+       $git_dir = "$projectroot/$path";
+       open($fd, "-|", git_cmd(), 'for-each-ref',
+            '--format=%(committer)',
+            '--sort=-committerdate',
+            '--count=1',
+            map { "refs/$_" } get_branch_refs ()) or return;
+       my $most_recent = <$fd>;
+       close $fd or return;
+       if (defined $most_recent &&
+           $most_recent =~ / (\d+) [-+][01]\d\d\d$/) {
+               my $timestamp = $1;
+               my $age = time - $timestamp;
+               return ($age, age_string($age));
+       }
+       return (undef, undef);
+}
+
+# Implementation note: when a single remote is wanted, we cannot use 'git
+# remote show -n' because that command always work (assuming it's a remote URL
+# if it's not defined), and we cannot use 'git remote show' because that would
+# try to make a network roundtrip. So the only way to find if that particular
+# remote is defined is to walk the list provided by 'git remote -v' and stop if
+# and when we find what we want.
+sub git_get_remotes_list {
+       my $wanted = shift;
+       my %remotes = ();
+
+       open my $fd, '-|' , git_cmd(), 'remote', '-v';
+       return unless $fd;
+       while (my $remote = <$fd>) {
+               chomp $remote;
+               $remote =~ s!\t(.*?)\s+\((\w+)\)$!!;
+               next if $wanted and not $remote eq $wanted;
+               my ($url, $key) = ($1, $2);
+
+               $remotes{$remote} ||= { 'heads' => () };
+               $remotes{$remote}{$key} = $url;
+       }
+       close $fd or return;
+       return wantarray ? %remotes : \%remotes;
+}
+
+# Takes a hash of remotes as first parameter and fills it by adding the
+# available remote heads for each of the indicated remotes.
+sub fill_remote_heads {
+       my $remotes = shift;
+       my @heads = map { "remotes/$_" } keys %$remotes;
+       my @remoteheads = git_get_heads_list(undef, @heads);
+       foreach my $remote (keys %$remotes) {
+               $remotes->{$remote}{'heads'} = [ grep {
+                       $_->{'name'} =~ s!^$remote/!!
+                       } @remoteheads ];
+       }
+}
+
+sub git_get_references {
+       my $type = shift || "";
+       my %refs;
+       # 5dc01c595e6c6ec9ccda4f6f69c131c0dd945f8c refs/tags/v2.6.11
+       # c39ae07f393806ccf406ef966e9a15afc43cc36a refs/tags/v2.6.11^{}
+       open my $fd, "-|", git_cmd(), "show-ref", "--dereference",
+               ($type ? ("--", "refs/$type") : ()) # use -- <pattern> if $type
+               or return;
+
+       while (my $line = <$fd>) {
+               chomp $line;
+               if ($line =~ m!^([0-9a-fA-F]{40})\srefs/($type.*)$!) {
+                       if (defined $refs{$1}) {
+                               push @{$refs{$1}}, $2;
+                       } else {
+                               $refs{$1} = [ $2 ];
+                       }
+               }
+       }
+       close $fd or return;
+       return \%refs;
+}
+
+sub git_get_rev_name_tags {
+       my $hash = shift || return undef;
+
+       open my $fd, "-|", git_cmd(), "name-rev", "--tags", $hash
+               or return;
+       my $name_rev = <$fd>;
+       close $fd;
+
+       if ($name_rev =~ m|^$hash tags/(.*)$|) {
+               return $1;
+       } else {
+               # catches also '$hash undefined' output
+               return undef;
+       }
+}
+
+## ----------------------------------------------------------------------
+## parse to hash functions
+
+sub parse_date {
+       my $epoch = shift;
+       my $tz = shift || "-0000";
+
+       my %date;
+       my @months = ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
+       my @days = ("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat");
+       my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($epoch);
+       $date{'hour'} = $hour;
+       $date{'minute'} = $min;
+       $date{'mday'} = $mday;
+       $date{'day'} = $days[$wday];
+       $date{'month'} = $months[$mon];
+       $date{'rfc2822'}   = sprintf "%s, %d %s %4d %02d:%02d:%02d +0000",
+                            $days[$wday], $mday, $months[$mon], 1900+$year, $hour ,$min, $sec;
+       $date{'mday-time'} = sprintf "%d %s %02d:%02d",
+                            $mday, $months[$mon], $hour ,$min;
+       $date{'iso-8601'}  = sprintf "%04d-%02d-%02dT%02d:%02d:%02dZ",
+                            1900+$year, 1+$mon, $mday, $hour ,$min, $sec;
+
+       my ($tz_sign, $tz_hour, $tz_min) =
+               ($tz =~ m/^([-+])(\d\d)(\d\d)$/);
+       $tz_sign = ($tz_sign eq '-' ? -1 : +1);
+       my $local = $epoch + $tz_sign*((($tz_hour*60) + $tz_min)*60);
+       ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($local);
+       $date{'hour_local'} = $hour;
+       $date{'minute_local'} = $min;
+       $date{'tz_local'} = $tz;
+       $date{'iso-tz'} = sprintf("%04d-%02d-%02d %02d:%02d:%02d %s",
+                                 1900+$year, $mon+1, $mday,
+                                 $hour, $min, $sec, $tz);
+       return %date;
+}
+
+sub parse_tag {
+       my $tag_id = shift;
+       my %tag;
+       my @comment;
+
+       open my $fd, "-|", git_cmd(), "cat-file", "tag", $tag_id or return;
+       $tag{'id'} = $tag_id;
+       while (my $line = <$fd>) {
+               chomp $line;
+               if ($line =~ m/^object ([0-9a-fA-F]{40})$/) {
+                       $tag{'object'} = $1;
+               } elsif ($line =~ m/^type (.+)$/) {
+                       $tag{'type'} = $1;
+               } elsif ($line =~ m/^tag (.+)$/) {
+                       $tag{'name'} = $1;
+               } elsif ($line =~ m/^tagger (.*) ([0-9]+) (.*)$/) {
+                       $tag{'author'} = $1;
+                       $tag{'author_epoch'} = $2;
+                       $tag{'author_tz'} = $3;
+                       if ($tag{'author'} =~ m/^([^<]+) <([^>]*)>/) {
+                               $tag{'author_name'}  = $1;
+                               $tag{'author_email'} = $2;
+                       } else {
+                               $tag{'author_name'} = $tag{'author'};
+                       }
+               } elsif ($line =~ m/--BEGIN/) {
+                       push @comment, $line;
+                       last;
+               } elsif ($line eq "") {
+                       last;
+               }
+       }
+       push @comment, <$fd>;
+       $tag{'comment'} = \@comment;
+       close $fd or return;
+       if (!defined $tag{'name'}) {
+               return
+       };
+       return %tag
+}
+
+sub parse_commit_text {
+       my ($commit_text, $withparents) = @_;
+       my @commit_lines = split '\n', $commit_text;
+       my %co;
+
+       pop @commit_lines; # Remove '\0'
+
+       if (! @commit_lines) {
+               return;
+       }
+
+       my $header = shift @commit_lines;
+       if ($header !~ m/^[0-9a-fA-F]{40}/) {
+               return;
+       }
+       ($co{'id'}, my @parents) = split ' ', $header;
+       while (my $line = shift @commit_lines) {
+               last if $line eq "\n";
+               if ($line =~ m/^tree ([0-9a-fA-F]{40})$/) {
+                       $co{'tree'} = $1;
+               } elsif ((!defined $withparents) && ($line =~ m/^parent ([0-9a-fA-F]{40})$/)) {
+                       push @parents, $1;
+               } elsif ($line =~ m/^author (.*) ([0-9]+) (.*)$/) {
+                       $co{'author'} = to_utf8($1);
+                       $co{'author_epoch'} = $2;
+                       $co{'author_tz'} = $3;
+                       if ($co{'author'} =~ m/^([^<]+) <([^>]*)>/) {
+                               $co{'author_name'}  = $1;
+                               $co{'author_email'} = $2;
+                       } else {
+                               $co{'author_name'} = $co{'author'};
+                       }
+               } elsif ($line =~ m/^committer (.*) ([0-9]+) (.*)$/) {
+                       $co{'committer'} = to_utf8($1);
+                       $co{'committer_epoch'} = $2;
+                       $co{'committer_tz'} = $3;
+                       if ($co{'committer'} =~ m/^([^<]+) <([^>]*)>/) {
+                               $co{'committer_name'}  = $1;
+                               $co{'committer_email'} = $2;
+                       } else {
+                               $co{'committer_name'} = $co{'committer'};
+                       }
+               }
+       }
+       if (!defined $co{'tree'}) {
+               return;
+       };
+       $co{'parents'} = \@parents;
+       $co{'parent'} = $parents[0];
+
+       foreach my $title (@commit_lines) {
+               $title =~ s/^    //;
+               if ($title ne "") {
+                       $co{'title'} = chop_str($title, 80, 5);
+                       # remove leading stuff of merges to make the interesting part visible
+                       if (length($title) > 50) {
+                               $title =~ s/^Automatic //;
+                               $title =~ s/^merge (of|with) /Merge ... /i;
+                               if (length($title) > 50) {
+                                       $title =~ s/(http|rsync):\/\///;
+                               }
+                               if (length($title) > 50) {
+                                       $title =~ s/(master|www|rsync)\.//;
+                               }
+                               if (length($title) > 50) {
+                                       $title =~ s/kernel.org:?//;
+                               }
+                               if (length($title) > 50) {
+                                       $title =~ s/\/pub\/scm//;
+                               }
+                       }
+                       $co{'title_short'} = chop_str($title, 50, 5);
+                       last;
+               }
+       }
+       if (! defined $co{'title'} || $co{'title'} eq "") {
+               $co{'title'} = $co{'title_short'} = '(no commit message)';
+       }
+       # remove added spaces
+       foreach my $line (@commit_lines) {
+               $line =~ s/^    //;
+       }
+       $co{'comment'} = \@commit_lines;
+
+       my $age = time - $co{'committer_epoch'};
+       $co{'age'} = $age;
+       $co{'age_string'} = age_string($age);
+       my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday) = gmtime($co{'committer_epoch'});
+       if ($age > 60*60*24*7*2) {
+               $co{'age_string_date'} = sprintf "%4i-%02u-%02i", 1900 + $year, $mon+1, $mday;
+               $co{'age_string_age'} = $co{'age_string'};
+       } else {
+               $co{'age_string_date'} = $co{'age_string'};
+               $co{'age_string_age'} = sprintf "%4i-%02u-%02i", 1900 + $year, $mon+1, $mday;
+       }
+       return %co;
+}
+
+sub parse_commit {
+       my ($commit_id) = @_;
+       my %co;
+
+       local $/ = "\0";
+
+       open my $fd, "-|", git_cmd(), "rev-list",
+               "--parents",
+               "--header",
+               "--max-count=1",
+               $commit_id,
+               "--",
+               or die_error(500, "Open git-rev-list failed");
+       %co = parse_commit_text(<$fd>, 1);
+       close $fd;
+
+       return %co;
+}
+
+sub parse_commits {
+       my ($commit_id, $maxcount, $skip, $filename, @args) = @_;
+       my @cos;
+
+       $maxcount ||= 1;
+       $skip ||= 0;
+
+       local $/ = "\0";
+
+       open my $fd, "-|", git_cmd(), "rev-list",
+               "--header",
+               @args,
+               ("--max-count=" . $maxcount),
+               ("--skip=" . $skip),
+               @extra_options,
+               $commit_id,
+               "--",
+               ($filename ? ($filename) : ())
+               or die_error(500, "Open git-rev-list failed");
+       while (my $line = <$fd>) {
+               my %co = parse_commit_text($line);
+               push @cos, \%co;
+       }
+       close $fd;
+
+       return wantarray ? @cos : \@cos;
+}
+
+# parse line of git-diff-tree "raw" output
+sub parse_difftree_raw_line {
+       my $line = shift;
+       my %res;
+
+       # ':100644 100644 03b218260e99b78c6df0ed378e59ed9205ccc96d 3b93d5e7cc7f7dd4ebed13a5cc1a4ad976fc94d8 M   ls-files.c'
+       # ':100644 100644 7f9281985086971d3877aca27704f2aaf9c448ce bc190ebc71bbd923f2b728e505408f5e54bd073a M   rev-tree.c'
+       if ($line =~ m/^:([0-7]{6}) ([0-7]{6}) ([0-9a-fA-F]{40}) ([0-9a-fA-F]{40}) (.)([0-9]{0,3})\t(.*)$/) {
+               $res{'from_mode'} = $1;
+               $res{'to_mode'} = $2;
+               $res{'from_id'} = $3;
+               $res{'to_id'} = $4;
+               $res{'status'} = $5;
+               $res{'similarity'} = $6;
+               if ($res{'status'} eq 'R' || $res{'status'} eq 'C') { # renamed or copied
+                       ($res{'from_file'}, $res{'to_file'}) = map { unquote($_) } split("\t", $7);
+               } else {
+                       $res{'from_file'} = $res{'to_file'} = $res{'file'} = unquote($7);
+               }
+       }
+       # '::100755 100755 100755 60e79ca1b01bc8b057abe17ddab484699a7f5fdb 94067cc5f73388f33722d52ae02f44692bc07490 94067cc5f73388f33722d52ae02f44692bc07490 MR git-gui/git-gui.sh'
+       # combined diff (for merge commit)
+       elsif ($line =~ s/^(::+)((?:[0-7]{6} )+)((?:[0-9a-fA-F]{40} )+)([a-zA-Z]+)\t(.*)$//) {
+               $res{'nparents'}  = length($1);
+               $res{'from_mode'} = [ split(' ', $2) ];
+               $res{'to_mode'} = pop @{$res{'from_mode'}};
+               $res{'from_id'} = [ split(' ', $3) ];
+               $res{'to_id'} = pop @{$res{'from_id'}};
+               $res{'status'} = [ split('', $4) ];
+               $res{'to_file'} = unquote($5);
+       }
+       # 'c512b523472485aef4fff9e57b229d9d243c967f'
+       elsif ($line =~ m/^([0-9a-fA-F]{40})$/) {
+               $res{'commit'} = $1;
+       }
+
+       return wantarray ? %res : \%res;
+}
+
+# wrapper: return parsed line of git-diff-tree "raw" output
+# (the argument might be raw line, or parsed info)
+sub parsed_difftree_line {
+       my $line_or_ref = shift;
+
+       if (ref($line_or_ref) eq "HASH") {
+               # pre-parsed (or generated by hand)
+               return $line_or_ref;
+       } else {
+               return parse_difftree_raw_line($line_or_ref);
+       }
+}
+
+# parse line of git-ls-tree output
+sub parse_ls_tree_line {
+       my $line = shift;
+       my %opts = @_;
+       my %res;
+
+       if ($opts{'-l'}) {
+               #'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa   16717  panic.c'
+               $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40}) +(-|[0-9]+)\t(.+)$/s;
+
+               $res{'mode'} = $1;
+               $res{'type'} = $2;
+               $res{'hash'} = $3;
+               $res{'size'} = $4;
+               if ($opts{'-z'}) {
+                       $res{'name'} = $5;
+               } else {
+                       $res{'name'} = unquote($5);
+               }
+       } else {
+               #'100644 blob 0fa3f3a66fb6a137f6ec2c19351ed4d807070ffa  panic.c'
+               $line =~ m/^([0-9]+) (.+) ([0-9a-fA-F]{40})\t(.+)$/s;
+
+               $res{'mode'} = $1;
+               $res{'type'} = $2;
+               $res{'hash'} = $3;
+               if ($opts{'-z'}) {
+                       $res{'name'} = $4;
+               } else {
+                       $res{'name'} = unquote($4);
+               }
+       }
+
+       return wantarray ? %res : \%res;
+}
+
+# generates _two_ hashes, references to which are passed as 2 and 3 argument
+sub parse_from_to_diffinfo {
+       my ($diffinfo, $from, $to, @parents) = @_;
+
+       if ($diffinfo->{'nparents'}) {
+               # combined diff
+               $from->{'file'} = [];
+               $from->{'href'} = [];
+               fill_from_file_info($diffinfo, @parents)
+                       unless exists $diffinfo->{'from_file'};
+               for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
+                       $from->{'file'}[$i] =
+                               defined $diffinfo->{'from_file'}[$i] ?
+                                       $diffinfo->{'from_file'}[$i] :
+                                       $diffinfo->{'to_file'};
+                       if ($diffinfo->{'status'}[$i] ne "A") { # not new (added) file
+                               $from->{'href'}[$i] = href(action=>"blob",
+                                                          hash_base=>$parents[$i],
+                                                          hash=>$diffinfo->{'from_id'}[$i],
+                                                          file_name=>$from->{'file'}[$i]);
+                       } else {
+                               $from->{'href'}[$i] = undef;
+                       }
+               }
+       } else {
+               # ordinary (not combined) diff
+               $from->{'file'} = $diffinfo->{'from_file'};
+               if ($diffinfo->{'status'} ne "A") { # not new (added) file
+                       $from->{'href'} = href(action=>"blob", hash_base=>$hash_parent,
+                                              hash=>$diffinfo->{'from_id'},
+                                              file_name=>$from->{'file'});
+               } else {
+                       delete $from->{'href'};
+               }
+       }
+
+       $to->{'file'} = $diffinfo->{'to_file'};
+       if (!is_deleted($diffinfo)) { # file exists in result
+               $to->{'href'} = href(action=>"blob", hash_base=>$hash,
+                                    hash=>$diffinfo->{'to_id'},
+                                    file_name=>$to->{'file'});
+       } else {
+               delete $to->{'href'};
+       }
+}
+
+## ......................................................................
+## parse to array of hashes functions
+
+sub git_get_heads_list {
+       my ($limit, @classes) = @_;
+       @classes = get_branch_refs() unless @classes;
+       my @patterns = map { "refs/$_" } @classes;
+       my @headslist;
+
+       open my $fd, '-|', git_cmd(), 'for-each-ref',
+               ($limit ? '--count='.($limit+1) : ()), '--sort=-committerdate',
+               '--format=%(objectname) %(refname) %(subject)%00%(committer)',
+               @patterns
+               or return;
+       while (my $line = <$fd>) {
+               my %ref_item;
+
+               chomp $line;
+               my ($refinfo, $committerinfo) = split(/\0/, $line);
+               my ($hash, $name, $title) = split(' ', $refinfo, 3);
+               my ($committer, $epoch, $tz) =
+                       ($committerinfo =~ /^(.*) ([0-9]+) (.*)$/);
+               $ref_item{'fullname'}  = $name;
+               my $strip_refs = join '|', map { quotemeta } get_branch_refs();
+               $name =~ s!^refs/($strip_refs|remotes)/!!;
+               $ref_item{'name'} = $name;
+               # for refs neither in 'heads' nor 'remotes' we want to
+               # show their ref dir
+               my $ref_dir = (defined $1) ? $1 : '';
+               if ($ref_dir ne '' and $ref_dir ne 'heads' and $ref_dir ne 'remotes') {
+                   $ref_item{'name'} .= ' (' . $ref_dir . ')';
+               }
+
+               $ref_item{'id'}    = $hash;
+               $ref_item{'title'} = $title || '(no commit message)';
+               $ref_item{'epoch'} = $epoch;
+               if ($epoch) {
+                       $ref_item{'age'} = age_string(time - $ref_item{'epoch'});
+               } else {
+                       $ref_item{'age'} = "unknown";
+               }
+
+               push @headslist, \%ref_item;
+       }
+       close $fd;
+
+       return wantarray ? @headslist : \@headslist;
+}
+
+sub git_get_tags_list {
+       my $limit = shift;
+       my @tagslist;
+
+       open my $fd, '-|', git_cmd(), 'for-each-ref',
+               ($limit ? '--count='.($limit+1) : ()), '--sort=-creatordate',
+               '--format=%(objectname) %(objecttype) %(refname) '.
+               '%(*objectname) %(*objecttype) %(subject)%00%(creator)',
+               'refs/tags'
+               or return;
+       while (my $line = <$fd>) {
+               my %ref_item;
+
+               chomp $line;
+               my ($refinfo, $creatorinfo) = split(/\0/, $line);
+               my ($id, $type, $name, $refid, $reftype, $title) = split(' ', $refinfo, 6);
+               my ($creator, $epoch, $tz) =
+                       ($creatorinfo =~ /^(.*) ([0-9]+) (.*)$/);
+               $ref_item{'fullname'} = $name;
+               $name =~ s!^refs/tags/!!;
+
+               $ref_item{'type'} = $type;
+               $ref_item{'id'} = $id;
+               $ref_item{'name'} = $name;
+               if ($type eq "tag") {
+                       $ref_item{'subject'} = $title;
+                       $ref_item{'reftype'} = $reftype;
+                       $ref_item{'refid'}   = $refid;
+               } else {
+                       $ref_item{'reftype'} = $type;
+                       $ref_item{'refid'}   = $id;
+               }
+
+               if ($type eq "tag" || $type eq "commit") {
+                       $ref_item{'epoch'} = $epoch;
+                       if ($epoch) {
+                               $ref_item{'age'} = age_string(time - $ref_item{'epoch'});
+                       } else {
+                               $ref_item{'age'} = "unknown";
+                       }
+               }
+
+               push @tagslist, \%ref_item;
+       }
+       close $fd;
+
+       return wantarray ? @tagslist : \@tagslist;
+}
+
+## ----------------------------------------------------------------------
+## filesystem-related functions
+
+sub get_file_owner {
+       my $path = shift;
+
+       my ($dev, $ino, $mode, $nlink, $st_uid, $st_gid, $rdev, $size) = stat($path);
+       my ($name, $passwd, $uid, $gid, $quota, $comment, $gcos, $dir, $shell) = getpwuid($st_uid);
+       if (!defined $gcos) {
+               return undef;
+       }
+       my $owner = $gcos;
+       $owner =~ s/[,;].*$//;
+       return to_utf8($owner);
+}
+
+# assume that file exists
+sub insert_file {
+       my $filename = shift;
+
+       open my $fd, '<', $filename;
+       print map { to_utf8($_) } <$fd>;
+       close $fd;
+}
+
+## ......................................................................
+## mimetype related functions
+
+sub mimetype_guess_file {
+       my $filename = shift;
+       my $mimemap = shift;
+       -r $mimemap or return undef;
+
+       my %mimemap;
+       open(my $mh, '<', $mimemap) or return undef;
+       while (<$mh>) {
+               next if m/^#/; # skip comments
+               my ($mimetype, @exts) = split(/\s+/);
+               foreach my $ext (@exts) {
+                       $mimemap{$ext} = $mimetype;
+               }
+       }
+       close($mh);
+
+       $filename =~ /\.([^.]*)$/;
+       return $mimemap{$1};
+}
+
+sub mimetype_guess {
+       my $filename = shift;
+       my $mime;
+       $filename =~ /\./ or return undef;
+
+       if ($mimetypes_file) {
+               my $file = $mimetypes_file;
+               if ($file !~ m!^/!) { # if it is relative path
+                       # it is relative to project
+                       $file = "$projectroot/$project/$file";
+               }
+               $mime = mimetype_guess_file($filename, $file);
+       }
+       $mime ||= mimetype_guess_file($filename, '/etc/mime.types');
+       return $mime;
+}
+
+sub blob_mimetype {
+       my $fd = shift;
+       my $filename = shift;
+
+       if ($filename) {
+               my $mime = mimetype_guess($filename);
+               $mime and return $mime;
+       }
+
+       # just in case
+       return $default_blob_plain_mimetype unless $fd;
+
+       if (-T $fd) {
+               return 'text/plain';
+       } 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$/i) {
+               return 'image/jpeg';
+       } else {
+               return 'application/octet-stream';
+       }
+}
+
+sub blob_contenttype {
+       my ($fd, $file_name, $type) = @_;
+
+       $type ||= blob_mimetype($fd, $file_name);
+       if ($type eq 'text/plain' && defined $default_text_plain_charset) {
+               $type .= "; charset=$default_text_plain_charset";
+       }
+
+       return $type;
+}
+
+# guess file syntax for syntax highlighting; return undef if no highlighting
+# the name of syntax can (in the future) depend on syntax highlighter used
+sub guess_file_syntax {
+       my ($highlight, $mimetype, $file_name) = @_;
+       return undef unless ($highlight && defined $file_name);
+       my $basename = basename($file_name, '.in');
+       return $highlight_basename{$basename}
+               if exists $highlight_basename{$basename};
+
+       $basename =~ /\.([^.]*)$/;
+       my $ext = $1 or return undef;
+       return $highlight_ext{$ext}
+               if exists $highlight_ext{$ext};
+
+       return undef;
+}
+
+# run highlighter and return FD of its output,
+# or return original FD if no highlighting
+sub run_highlighter {
+       my ($fd, $highlight, $syntax) = @_;
+       return $fd unless ($highlight);
+
+       close $fd;
+       my $syntax_arg = (defined $syntax) ? "--syntax $syntax" : "--force";
+       open $fd, quote_command(git_cmd(), "cat-file", "blob", $hash)." | ".
+                         quote_command($highlight_bin).
+                         #        " pygmentize -f html |"
+                         " --replace-tabs=8 --fragment $syntax_arg |"
+               or die_error(500, "Couldn't open file or run syntax highlighter");
+       return $fd;
+}
+
+## ======================================================================
+## functions printing HTML: header, footer, error page
+
+sub get_page_title {
+       my $title = to_utf8($site_name);
+
+       unless (defined $project) {
+               if (defined $project_filter) {
+                       $title .= " - projects in '" . esc_path($project_filter) . "'";
+               }
+               return $title;
+       }
+       $title .= " - " . to_utf8($project);
+
+       return $title unless (defined $action);
+       $title .= "/$action"; # $action is US-ASCII (7bit ASCII)
+
+       return $title unless (defined $file_name);
+       $title .= " - " . esc_path($file_name);
+       if ($action eq "tree" && $file_name !~ m|/$|) {
+               $title .= "/";
+       }
+
+       return $title;
+}
+
+sub get_content_type_html {
+       # require explicit support from the UA if we are to send the page as
+       # 'application/xhtml+xml', otherwise send it as plain old 'text/html'.
+       # we have to do this because MSIE sometimes globs '*/*', pretending to
+       # support xhtml+xml but choking when it gets what it asked for.
+       # if (defined $cgi->http('HTTP_ACCEPT') &&
+       #     $cgi->http('HTTP_ACCEPT') =~ m/(,|;|\s|^)application\/xhtml\+xml(,|;|\s|$)/ &&
+       #     $cgi->Accept('application/xhtml+xml') != 0) {
+       #       return 'application/xhtml+xml';
+       # } else {
+  return 'text/html';
+  # }
+}
+
+sub print_feed_meta {
+       if (defined $project) {
+               my %href_params = get_feed_info();
+               if (!exists $href_params{'-title'}) {
+                       $href_params{'-title'} = 'log';
+               }
+
+               foreach my $format (qw(RSS Atom)) {
+                       my $type = lc($format);
+                       my %link_attr = (
+                               '-rel' => 'alternate',
+                               '-title' => esc_attr("$project - $href_params{'-title'} - $format feed"),
+                               '-type' => "application/$type+xml"
+                       );
+
+                       $href_params{'extra_options'} = undef;
+                       $href_params{'action'} = $type;
+                       $link_attr{'-href'} = href(%href_params);
+                       print "<link ".
+                             "rel=\"$link_attr{'-rel'}\" ".
+                             "title=\"$link_attr{'-title'}\" ".
+                             "href=\"$link_attr{'-href'}\" ".
+                             "type=\"$link_attr{'-type'}\" ".
+                             "/>\n";
+
+                       $href_params{'extra_options'} = '--no-merges';
+                       $link_attr{'-href'} = href(%href_params);
+                       $link_attr{'-title'} .= ' (no merges)';
+                       print "<link ".
+                             "rel=\"$link_attr{'-rel'}\" ".
+                             "title=\"$link_attr{'-title'}\" ".
+                             "href=\"$link_attr{'-href'}\" ".
+                             "type=\"$link_attr{'-type'}\" ".
+                             "/>\n";
+               }
+
+       } else {
+               printf('<link rel="alternate" title="%s projects list" '.
+                      'href="%s" type="text/plain; charset=utf-8" />'."\n",
+                      esc_attr($site_name), href(project=>undef, action=>"project_index"));
+               printf('<link rel="alternate" title="%s projects feeds" '.
+                      'href="%s" type="text/x-opml" />'."\n",
+                      esc_attr($site_name), href(project=>undef, action=>"opml"));
+       }
+}
+
+sub print_header_links {
+       my $status = shift;
+
+       # print out each stylesheet that exist, providing backwards capability
+       # for those people who defined $stylesheet in a config file
+       if (defined $stylesheet) {
+               print '<link rel="stylesheet" type="text/css" href="'.esc_url($stylesheet).'"/>'."\n";
+       } else {
+               foreach my $stylesheet (@stylesheets) {
+                       next unless $stylesheet;
+                       print '<link rel="stylesheet" type="text/css" href="'.esc_url($stylesheet).'"/>'."\n";
+               }
+       }
+       print_feed_meta()
+               if ($status eq '200 OK');
+       if (defined $favicon) {
+               print qq(<link rel="shortcut icon" href=").esc_url($favicon).qq(" type="image/png" />\n);
+       }
+}
+
+sub print_nav_breadcrumbs_path {
+       my $dirprefix = undef;
+       while (my $part = shift) {
+               $dirprefix .= "/" if defined $dirprefix;
+               $dirprefix .= $part;
+               print $cgi->a({-href => href(project => undef,
+                                            project_filter => $dirprefix,
+                                            action => "project_list")},
+                             esc_html($part)) . " / ";
+       }
+}
+
+sub print_nav_breadcrumbs {
+       my %opts = @_;
+
+       for my $crumb (@extra_breadcrumbs, [ $home_link_str => $home_link ]) {
+               print $cgi->a({-href => esc_url($crumb->[1])}, $crumb->[0]) . " / ";
+       }
+       if (defined $project) {
+               my @dirname = split '/', $project;
+               my $projectbasename = pop @dirname;
+               print_nav_breadcrumbs_path(@dirname);
+               print $cgi->a({-href => href(action=>"summary")}, esc_html($projectbasename));
+               if (defined $action) {
+                       my $action_print = $action ;
+                       if (defined $opts{-action_extra}) {
+                               $action_print = $cgi->a({-href => href(action=>$action)},
+                                       $action);
+                       }
+                       print " / $action_print";
+               }
+               if (defined $opts{-action_extra}) {
+                       print " / $opts{-action_extra}";
+               }
+               print "\n";
+       } elsif (defined $project_filter) {
+               print_nav_breadcrumbs_path(split '/', $project_filter);
+       }
+}
+
+sub print_search_form {
+       if (!defined $searchtext) {
+               $searchtext = "";
+       }
+       my $search_hash;
+       if (defined $hash_base) {
+               $search_hash = $hash_base;
+       } elsif (defined $hash) {
+               $search_hash = $hash;
+       } else {
+               $search_hash = "HEAD";
+       }
+       my $action = $my_uri;
+       my $use_pathinfo = gitweb_check_feature('pathinfo');
+       if ($use_pathinfo) {
+               $action .= "/".esc_url($project);
+       }
+       print $cgi->start_form(-method => "get", -action => $action) .
+             "<div class=\"search\">\n" .
+             (!$use_pathinfo &&
+             $cgi->input({-name=>"p", -value=>$project, -type=>"hidden"}) . "\n") .
+             $cgi->input({-name=>"a", -value=>"search", -type=>"hidden"}) . "\n" .
+             $cgi->input({-name=>"h", -value=>$search_hash, -type=>"hidden"}) . "\n" .
+             $cgi->popup_menu(-name => 'st', -default => 'commit',
+                              -values => ['commit', 'grep', 'author', 'committer', 'pickaxe']) .
+             " " . $cgi->a({-href => href(action=>"search_help"),
+                            -title => "search help" }, "?") . " search:\n",
+             $cgi->textfield(-name => "s", -value => $searchtext, -override => 1) . "\n" .
+             "<span title=\"Extended regular expression\">" .
+             $cgi->checkbox(-name => 'sr', -value => 1, -label => 're',
+                            -checked => $search_use_regexp) .
+             "</span>" .
+             "</div>" .
+             $cgi->end_form() . "\n";
+}
+
+sub git_header_html {
+       my $status = shift || "200 OK";
+       my $expires = shift;
+       my %opts = @_;
+
+       my $title = get_page_title();
+       my $content_type = get_content_type_html();
+       print $cgi->header(-type=>$content_type, -charset => 'utf-8',
+                          -status=> $status, -expires => $expires)
+               unless ($opts{'-no_http_header'});
+       my $mod_perl_version = $ENV{'MOD_PERL'} ? " $ENV{'MOD_PERL'}" : '';
+       print <<EOF;
+<!DOCTYPE html>
+<html lang="en-US">
+<!-- git web interface version $version, (C) 2005-2006, Kay Sievers <kay.sievers\@vrfy.org>, Christian Gierke -->
+<!-- git core binaries version $git_version -->
+<head>
+<meta http-equiv="content-type" content="$content_type; charset=utf-8"/>
+<meta name="generator" content="gitweb/$version git/$git_version$mod_perl_version"/>
+<meta name="robots" content="index, nofollow"/>
+<title>$title</title>
+EOF
+       # the stylesheet, favicon etc urls won't work correctly with path_info
+       # unless we set the appropriate base URL
+       if ($ENV{'PATH_INFO'}) {
+               print "<base href=\"".esc_url($base_url)."\" />\n";
+       }
+       print_header_links($status);
+
+       if (defined $site_html_head_string) {
+               print to_utf8($site_html_head_string);
+       }
+
+       print "</head>\n" .
+             "<body>\n";
+
+       if (defined $site_header && -f $site_header) {
+               insert_file($site_header);
+       }
+
+       print "<div class=\"page_header\">\n";
+       if (defined $logo) {
+               print $cgi->a({-href => esc_url($logo_url),
+                              -title => $logo_label},
+                             $cgi->img({-src => esc_url($logo),
+                                        -width => 72, -height => 27,
+                                        -alt => "git",
+                                        -class => "logo"}));
+       }
+       print_nav_breadcrumbs(%opts);
+       print "</div>\n";
+
+       my $have_search = gitweb_check_feature('search');
+       if (defined $project && $have_search) {
+               print_search_form();
+       }
+}
+
+sub git_footer_html {
+       my $feed_class = 'rss_logo';
+
+       print "<div class=\"page_footer\">\n";
+       if (defined $project) {
+               my $descr = git_get_project_description($project);
+               if (defined $descr) {
+                       print "<div class=\"page_footer_text\">" . esc_html($descr) . "</div>\n";
+               }
+
+               my %href_params = get_feed_info();
+               if (!%href_params) {
+                       $feed_class .= ' generic';
+               }
+               $href_params{'-title'} ||= 'log';
+
+               foreach my $format (qw(RSS Atom)) {
+                       $href_params{'action'} = lc($format);
+                       print $cgi->a({-href => href(%href_params),
+                                     -title => "$href_params{'-title'} $format feed",
+                                     -class => $feed_class}, $format)."\n";
+               }
+
+       } else {
+               print $cgi->a({-href => href(project=>undef, action=>"opml",
+                                            project_filter => $project_filter),
+                             -class => $feed_class}, "OPML") . " ";
+               print $cgi->a({-href => href(project=>undef, action=>"project_index",
+                                            project_filter => $project_filter),
+                             -class => $feed_class}, "TXT") . "\n";
+       }
+       print "</div>\n"; # class="page_footer"
+
+       if (defined $t0 && gitweb_check_feature('timed')) {
+               print "<div id=\"generating_info\">\n";
+               print 'This page took '.
+                     '<span id="generating_time" class="time_span">'.
+                     tv_interval($t0, [ gettimeofday() ]).
+                     ' seconds </span>'.
+                     ' and '.
+                     '<span id="generating_cmd">'.
+                     $number_of_git_cmds.
+                     '</span> git commands '.
+                     " to generate.\n";
+               print "</div>\n"; # class="page_footer"
+       }
+
+       if (defined $site_footer && -f $site_footer) {
+               insert_file($site_footer);
+       }
+
+       print qq!<script type="text/javascript" src="!.esc_url($javascript).qq!"></script>\n!;
+       if (defined $action &&
+           $action eq 'blame_incremental') {
+               print qq!<script type="text/javascript">\n!.
+                     qq!startBlame("!. href(action=>"blame_data", -replay=>1) .qq!",\n!.
+                     qq!           "!. href() .qq!");\n!.
+                     qq!</script>\n!;
+       } else {
+               my ($jstimezone, $tz_cookie, $datetime_class) =
+                       gitweb_get_feature('javascript-timezone');
+
+               print qq!<script type="text/javascript">\n!.
+                     qq!window.onload = function () {\n!;
+               if (gitweb_check_feature('javascript-actions')) {
+                       print qq!       fixLinks();\n!;
+               }
+               if ($jstimezone && $tz_cookie && $datetime_class) {
+                       print qq!       var tz_cookie = { name: '$tz_cookie', expires: 14, path: '/' };\n!. # in days
+                             qq!       onloadTZSetup('$jstimezone', tz_cookie, '$datetime_class');\n!;
+               }
+               print qq!};\n!.
+                     qq!</script>\n!;
+       }
+
+       print "</body>\n" .
+             "</html>";
+}
+
+# die_error(<http_status_code>, <error_message>[, <detailed_html_description>])
+# Example: die_error(404, 'Hash not found')
+# By convention, use the following status codes (as defined in RFC 2616):
+# 400: Invalid or missing CGI parameters, or
+#      requested object exists but has wrong type.
+# 403: Requested feature (like "pickaxe" or "snapshot") not enabled on
+#      this server or project.
+# 404: Requested object/revision/project doesn't exist.
+# 500: The server isn't configured properly, or
+#      an internal error occurred (e.g. failed assertions caused by bugs), or
+#      an unknown error occurred (e.g. the git binary died unexpectedly).
+# 503: The server is currently unavailable (because it is overloaded,
+#      or down for maintenance).  Generally, this is a temporary state.
+sub die_error {
+       my $status = shift || 500;
+       my $error = esc_html(shift) || "Internal Server Error";
+       my $extra = shift;
+       my %opts = @_;
+
+       my %http_responses = (
+               400 => '400 Bad Request',
+               403 => '403 Forbidden',
+               404 => '404 Not Found',
+               500 => '500 Internal Server Error',
+               503 => '503 Service Unavailable',
+       );
+       git_header_html($http_responses{$status}, undef, %opts);
+       print <<EOF;
+<div class="page_body">
+<br /><br />
+$status - $error
+<br />
+EOF
+       if (defined $extra) {
+               print "<hr />\n" .
+                     "$extra\n";
+       }
+       print "</div>\n";
+
+       git_footer_html();
+       goto DONE_GITWEB
+               unless ($opts{'-error_handler'});
+}
+
+## ----------------------------------------------------------------------
+## functions printing or outputting HTML: navigation
+
+sub git_print_page_nav {
+       my ($current, $suppress, $head, $treehead, $treebase, $extra) = @_;
+       $extra = '' if !defined $extra; # pager or formats
+
+       my @navs = qw(summary shortlog log commit commitdiff tree);
+       if ($suppress) {
+               @navs = grep { $_ ne $suppress } @navs;
+       }
+
+       my %arg = map { $_ => {action=>$_} } @navs;
+       if (defined $head) {
+               for (qw(commit commitdiff)) {
+                       $arg{$_}{'hash'} = $head;
+               }
+               if ($current =~ m/^(tree | log | shortlog | commit | commitdiff | search)$/x) {
+                       for (qw(shortlog log)) {
+                               $arg{$_}{'hash'} = $head;
+                       }
+               }
+       }
+
+       $arg{'tree'}{'hash'} = $treehead if defined $treehead;
+       $arg{'tree'}{'hash_base'} = $treebase if defined $treebase;
+
+       my @actions = gitweb_get_feature('actions');
+       my %repl = (
+               '%' => '%',
+               'n' => $project,         # project name
+               'f' => $git_dir,         # project path within filesystem
+               'h' => $treehead || '',  # current hash ('h' parameter)
+               'b' => $treebase || '',  # hash base ('hb' parameter)
+       );
+       while (@actions) {
+               my ($label, $link, $pos) = splice(@actions,0,3);
+               # insert
+               @navs = map { $_ eq $pos ? ($_, $label) : $_ } @navs;
+               # munch munch
+               $link =~ s/%([%nfhb])/$repl{$1}/g;
+               $arg{$label}{'_href'} = $link;
+       }
+
+       print "<div class=\"page_nav\">\n" .
+               (join "",
+                map { $_ eq $current ?
+                      "<div class=\"current\">$_</div>" : $cgi->a({-href => ($arg{$_}{_href} ? $arg{$_}{_href} : href(%{$arg{$_}}))}, "$_")
+                } @navs);
+       print "</div><div class=\"page_nav_extra\">\n$extra\n" .
+             "</div>\n";
+}
+
+# returns a submenu for the nagivation of the refs views (tags, heads,
+# remotes) with the current view disabled and the remotes view only
+# available if the feature is enabled
+sub format_ref_views {
+       my ($current) = @_;
+       my @ref_views = qw{tags heads};
+       push @ref_views, 'remotes' if gitweb_check_feature('remote_heads');
+       return join " | ", map {
+               $_ eq $current ? $_ :
+               $cgi->a({-href => href(action=>$_)}, $_)
+       } @ref_views
+}
+
+sub format_paging_nav {
+       my ($action, $page, $has_next_link) = @_;
+       my $paging_nav;
+
+
+       if ($page > 0) {
+               $paging_nav .=
+                       $cgi->a({-href => href(-replay=>1, page=>undef)}, "first") .
+                       " &sdot; " .
+                       $cgi->a({-href => href(-replay=>1, page=>$page-1),
+                                -accesskey => "p", -title => "Alt-p"}, "prev");
+       } else {
+               $paging_nav .= "first &sdot; prev";
+       }
+
+       if ($has_next_link) {
+               $paging_nav .= " &sdot; " .
+                       $cgi->a({-href => href(-replay=>1, page=>$page+1),
+                                -accesskey => "n", -title => "Alt-n"}, "next");
+       } else {
+               $paging_nav .= " &sdot; next";
+       }
+
+       return $paging_nav;
+}
+
+## ......................................................................
+## functions printing or outputting HTML: div
+
+sub git_print_header_div {
+       my ($action, $title, $hash, $hash_base, $class) = @_;
+       my %args = ();
+
+       $args{'action'} = $action;
+       $args{'hash'} = $hash if $hash;
+       $args{'hash_base'} = $hash_base if $hash_base;
+       $class = "" if ( not $class );
+
+       print "<div class=\"header $class\">\n" .
+             $cgi->a({-href => href(%args), -class => "title"},
+             $title ? $title : $action) .
+             "\n</div>\n";
+}
+
+sub format_repo_url {
+       my ($name, $url) = @_;
+       return "<tr class=\"metadata_url\"><td>$name</td><td>$url</td></tr>\n";
+}
+
+# Group output by placing it in a DIV element and adding a header.
+# Options for start_div() can be provided by passing a hash reference as the
+# first parameter to the function.
+# Options to git_print_header_div() can be provided by passing an array
+# reference. This must follow the options to start_div if they are present.
+# The content can be a scalar, which is output as-is, a scalar reference, which
+# is output after html escaping, an IO handle passed either as *handle or
+# *handle{IO}, or a function reference. In the latter case all following
+# parameters will be taken as argument to the content function call.
+sub git_print_section {
+       my ($div_args, $header_args, $content);
+       my $arg = shift;
+       if (ref($arg) eq 'HASH') {
+               $div_args = $arg;
+               $arg = shift;
+       }
+       if (ref($arg) eq 'ARRAY') {
+               $header_args = $arg;
+               $arg = shift;
+       }
+       $content = $arg;
+
+       print $cgi->start_div($div_args);
+       git_print_header_div(@$header_args);
+
+       if (ref($content) eq 'CODE') {
+               $content->(@_);
+       } elsif (ref($content) eq 'SCALAR') {
+               print esc_html($$content);
+       } elsif (ref($content) eq 'GLOB' or ref($content) eq 'IO::Handle') {
+               print <$content>;
+       } elsif (!ref($content) && defined($content)) {
+               print $content;
+       }
+
+       print $cgi->end_div;
+}
+
+sub format_timestamp_html {
+       my $date = shift;
+       my $strtime = $date->{'rfc2822'};
+
+       my (undef, undef, $datetime_class) =
+               gitweb_get_feature('javascript-timezone');
+       if ($datetime_class) {
+               $strtime = qq!<span class="$datetime_class">$strtime</span>!;
+       }
+
+       my $localtime_format = '(%02d:%02d %s)';
+       if ($date->{'hour_local'} < 6) {
+               $localtime_format = '(<span class="atnight">%02d:%02d</span> %s)';
+       }
+       $strtime .= ' ' .
+                   sprintf($localtime_format,
+                           $date->{'hour_local'}, $date->{'minute_local'}, $date->{'tz_local'});
+
+       return $strtime;
+}
+
+# Outputs the author name and date in long form
+sub git_print_authorship {
+       my $co = shift;
+       my %opts = @_;
+       my $tag = $opts{-tag} || 'div';
+       my $author = $co->{'author_name'};
+
+       my %ad = parse_date($co->{'author_epoch'}, $co->{'author_tz'});
+       print "<$tag class=\"author_date\">" .
+             format_search_author($author, "author", esc_html($author)) .
+             " [".format_timestamp_html(\%ad)."]".
+             git_get_avatar($co->{'author_email'}, -pad_before => 1) .
+             "</$tag>\n";
+}
+
+# Outputs table rows containing the full author or committer information,
+# in the format expected for 'commit' view (& similar).
+# Parameters are a commit hash reference, followed by the list of people
+# to output information for. If the list is empty it defaults to both
+# author and committer.
+sub git_print_authorship_rows {
+       my $co = shift;
+       # too bad we can't use @people = @_ || ('author', 'committer')
+       my @people = @_;
+       @people = ('author', 'committer') unless @people;
+       foreach my $who (@people) {
+               my %wd = parse_date($co->{"${who}_epoch"}, $co->{"${who}_tz"});
+               print "<tr><td>$who</td><td>" .
+                     format_search_author($co->{"${who}_name"}, $who,
+                                          esc_html($co->{"${who}_name"})) . " " .
+                     format_search_author($co->{"${who}_email"}, $who,
+                                          esc_html("<" . $co->{"${who}_email"} . ">")) .
+                     "</td><td rowspan=\"2\">" .
+                     git_get_avatar($co->{"${who}_email"}, -size => 'double') .
+                     "</td></tr>\n" .
+                     "<tr>" .
+                     "<td></td><td>" .
+                     format_timestamp_html(\%wd) .
+                     "</td>" .
+                     "</tr>\n";
+       }
+}
+
+sub git_print_page_path {
+       my $name = shift;
+       my $type = shift;
+       my $hb = shift;
+
+
+       print "<div class=\"page_path\">";
+       print $cgi->a({-href => href(action=>"tree", hash_base=>$hb),
+                     -title => 'tree root'}, to_utf8("[$project]"));
+       print " / ";
+       if (defined $name) {
+               my @dirname = split '/', $name;
+               my $basename = pop @dirname;
+               my $fullname = '';
+
+               foreach my $dir (@dirname) {
+                       $fullname .= ($fullname ? '/' : '') . $dir;
+                       print $cgi->a({-href => href(action=>"tree", file_name=>$fullname,
+                                                    hash_base=>$hb),
+                                     -title => $fullname}, esc_path($dir));
+                       print " / ";
+               }
+               if (defined $type && $type eq 'blob') {
+                       print $cgi->a({-href => href(action=>"blob_plain", file_name=>$file_name,
+                                                    hash_base=>$hb),
+                                     -title => $name}, esc_path($basename));
+               } elsif (defined $type && $type eq 'tree') {
+                       print $cgi->a({-href => href(action=>"tree", file_name=>$file_name,
+                                                    hash_base=>$hb),
+                                     -title => $name}, esc_path($basename));
+                       print " / ";
+               } else {
+                       print esc_path($basename);
+               }
+       }
+       print "<br/></div>\n";
+}
+
+sub git_print_log {
+       my $log = shift;
+       my %opts = @_;
+
+       if ($opts{'-remove_title'}) {
+               # remove title, i.e. first line of log
+               shift @$log;
+       }
+       # remove leading empty lines
+       while (defined $log->[0] && $log->[0] eq "") {
+               shift @$log;
+       }
+
+       # print log
+       my $skip_blank_line = 0;
+       foreach my $line (@$log) {
+               if ($line =~ m/^\s*([A-Z][-A-Za-z]*-[Bb]y|C[Cc]): /) {
+                       if (! $opts{'-remove_signoff'}) {
+                               print "<span class=\"signoff\">" . esc_html($line) . "</span><br/>\n";
+                               $skip_blank_line = 1;
+                       }
+                       next;
+               }
+
+               if ($line =~ m,\s*([a-z]*link): (https?://\S+),i) {
+                       if (! $opts{'-remove_signoff'}) {
+                               print "<span class=\"signoff\">" . esc_html($1) . ": " .
+                                       "<a href=\"" . esc_html($2) . "\">" . esc_html($2) . "</a>" .
+                                       "</span><br/>\n";
+                               $skip_blank_line = 1;
+                       }
+                       next;
+               }
+
+               # print only one empty line
+               # do not print empty line after signoff
+               if ($line eq "") {
+                       next if ($skip_blank_line);
+                       $skip_blank_line = 1;
+               } else {
+                       $skip_blank_line = 0;
+               }
+
+               print format_log_line_html($line) . "<br/>\n";
+       }
+
+       if ($opts{'-final_empty_line'}) {
+               # end with single empty line
+               print "<br/>\n" unless $skip_blank_line;
+       }
+}
+
+# return link target (what link points to)
+sub git_get_link_target {
+       my $hash = shift;
+       my $link_target;
+
+       # read link
+       open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
+               or return;
+       {
+               local $/ = undef;
+               $link_target = <$fd>;
+       }
+       close $fd
+               or return;
+
+       return $link_target;
+}
+
+# given link target, and the directory (basedir) the link is in,
+# return target of link relative to top directory (top tree);
+# return undef if it is not possible (including absolute links).
+sub normalize_link_target {
+       my ($link_target, $basedir) = @_;
+
+       # absolute symlinks (beginning with '/') cannot be normalized
+       return if (substr($link_target, 0, 1) eq '/');
+
+       # normalize link target to path from top (root) tree (dir)
+       my $path;
+       if ($basedir) {
+               $path = $basedir . '/' . $link_target;
+       } else {
+               # we are in top (root) tree (dir)
+               $path = $link_target;
+       }
+
+       # remove //, /./, and /../
+       my @path_parts;
+       foreach my $part (split('/', $path)) {
+               # discard '.' and ''
+               next if (!$part || $part eq '.');
+               # handle '..'
+               if ($part eq '..') {
+                       if (@path_parts) {
+                               pop @path_parts;
+                       } else {
+                               # link leads outside repository (outside top dir)
+                               return;
+                       }
+               } else {
+                       push @path_parts, $part;
+               }
+       }
+       $path = join('/', @path_parts);
+
+       return $path;
+}
+
+# print tree entry (row of git_tree), but without encompassing <tr> element
+sub git_print_tree_entry {
+       my ($t, $basedir, $hash_base, $have_blame) = @_;
+
+       my %base_key = ();
+       $base_key{'hash_base'} = $hash_base if defined $hash_base;
+
+       # The format of a table row is: mode list link.  Where mode is
+       # the mode of the entry, list is the name of the entry, an href,
+       # and link is the action links of the entry.
+
+       print "<td class=\"mode\">" . mode_str($t->{'mode'}) . "</td>\n";
+       if (exists $t->{'size'}) {
+               print "<td class=\"size\">$t->{'size'}</td>\n";
+       }
+       if ($t->{'type'} eq "blob") {
+               print "<td class=\"list\">" .
+                       $cgi->a({-href => href(action=>"blob", hash=>$t->{'hash'},
+                                              file_name=>"$basedir$t->{'name'}", %base_key),
+                               -class => "list"}, esc_path($t->{'name'}));
+               if (S_ISLNK(oct $t->{'mode'})) {
+                       my $link_target = git_get_link_target($t->{'hash'});
+                       if ($link_target) {
+                               my $norm_target = normalize_link_target($link_target, $basedir);
+                               if (defined $norm_target) {
+                                       print " -> " .
+                                             $cgi->a({-href => href(action=>"object", hash_base=>$hash_base,
+                                                                    file_name=>$norm_target),
+                                                      -title => $norm_target}, esc_path($link_target));
+                               } else {
+                                       print " -> " . esc_path($link_target);
+                               }
+                       }
+               }
+               print "</td>\n";
+               print "<td class=\"link\">";
+               print $cgi->a({-href => href(action=>"blob", hash=>$t->{'hash'},
+                                            file_name=>"$basedir$t->{'name'}", %base_key)},
+                             "blob");
+               if ($have_blame) {
+                       print " | " .
+                             $cgi->a({-href => href(action=>"blame", hash=>$t->{'hash'},
+                                                    file_name=>"$basedir$t->{'name'}", %base_key)},
+                                     "blame");
+               }
+               if (defined $hash_base) {
+                       print " | " .
+                             $cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
+                                                    hash=>$t->{'hash'}, file_name=>"$basedir$t->{'name'}")},
+                                     "history");
+               }
+               print " | " .
+                       $cgi->a({-href => href(action=>"blob_plain", hash_base=>$hash_base,
+                                              file_name=>"$basedir$t->{'name'}")},
+                               "raw");
+               print "</td>\n";
+
+       } elsif ($t->{'type'} eq "tree") {
+               print "<td class=\"list\">";
+               print $cgi->a({-href => href(action=>"tree", hash=>$t->{'hash'},
+                                            file_name=>"$basedir$t->{'name'}",
+                                            %base_key)},
+                             esc_path($t->{'name'}));
+               print "</td>\n";
+               print "<td class=\"link\">";
+               print $cgi->a({-href => href(action=>"tree", hash=>$t->{'hash'},
+                                            file_name=>"$basedir$t->{'name'}",
+                                            %base_key)},
+                             "tree");
+               if (defined $hash_base) {
+                       print " | " .
+                             $cgi->a({-href => href(action=>"history", hash_base=>$hash_base,
+                                                    file_name=>"$basedir$t->{'name'}")},
+                                     "history");
+               }
+               print "</td>\n";
+       } else {
+               # unknown object: we can only present history for it
+               # (this includes 'commit' object, i.e. submodule support)
+               print "<td class=\"list\">" .
+                     esc_path($t->{'name'}) .
+                     "</td>\n";
+               print "<td class=\"link\">";
+               if (defined $hash_base) {
+                       print $cgi->a({-href => href(action=>"history",
+                                                    hash_base=>$hash_base,
+                                                    file_name=>"$basedir$t->{'name'}")},
+                                     "history");
+               }
+               print "</td>\n";
+       }
+}
+
+## ......................................................................
+## functions printing large fragments of HTML
+
+# get pre-image filenames for merge (combined) diff
+sub fill_from_file_info {
+       my ($diff, @parents) = @_;
+
+       $diff->{'from_file'} = [ ];
+       $diff->{'from_file'}[$diff->{'nparents'} - 1] = undef;
+       for (my $i = 0; $i < $diff->{'nparents'}; $i++) {
+               if ($diff->{'status'}[$i] eq 'R' ||
+                   $diff->{'status'}[$i] eq 'C') {
+                       $diff->{'from_file'}[$i] =
+                               git_get_path_by_hash($parents[$i], $diff->{'from_id'}[$i]);
+               }
+       }
+
+       return $diff;
+}
+
+# is current raw difftree line of file deletion
+sub is_deleted {
+       my $diffinfo = shift;
+
+       return $diffinfo->{'to_id'} eq ('0' x 40);
+}
+
+# does patch correspond to [previous] difftree raw line
+# $diffinfo  - hashref of parsed raw diff format
+# $patchinfo - hashref of parsed patch diff format
+#              (the same keys as in $diffinfo)
+sub is_patch_split {
+       my ($diffinfo, $patchinfo) = @_;
+
+       return defined $diffinfo && defined $patchinfo
+               && $diffinfo->{'to_file'} eq $patchinfo->{'to_file'};
+}
+
+
+sub git_difftree_body {
+       my ($difftree, $hash, @parents) = @_;
+       my ($parent) = $parents[0];
+       my $have_blame = gitweb_check_feature('blame');
+       print "<div class=\"list_head\">\n";
+       if ($#{$difftree} > 10) {
+               print(($#{$difftree} + 1) . " files changed:\n");
+       }
+       print "</div>\n";
+
+       print "<table class=\"" .
+             (@parents > 1 ? "combined " : "") .
+             "diff_tree\">\n";
+
+       # header only for combined diff in 'commitdiff' view
+       my $has_header = @$difftree && @parents > 1 && $action eq 'commitdiff';
+       if ($has_header) {
+               # table header
+               print "<thead><tr>\n" .
+                      "<th></th><th></th>\n"; # filename, patchN link
+               for (my $i = 0; $i < @parents; $i++) {
+                       my $par = $parents[$i];
+                       print "<th>" .
+                             $cgi->a({-href => href(action=>"commitdiff",
+                                                    hash=>$hash, hash_parent=>$par),
+                                      -title => 'commitdiff to parent number ' .
+                                                 ($i+1) . ': ' . substr($par,0,7)},
+                                     $i+1) .
+                             "&nbsp;</th>\n";
+               }
+               print "</tr></thead>\n<tbody>\n";
+       }
+
+       my $alternate = 1;
+       my $patchno = 0;
+       foreach my $line (@{$difftree}) {
+               my $diff = parsed_difftree_line($line);
+
+               if ($alternate) {
+                       print "<tr class=\"dark\">\n";
+               } else {
+                       print "<tr class=\"light\">\n";
+               }
+               $alternate ^= 1;
+
+               if (exists $diff->{'nparents'}) { # combined diff
+
+                       fill_from_file_info($diff, @parents)
+                               unless exists $diff->{'from_file'};
+
+                       if (!is_deleted($diff)) {
+                               # file exists in the result (child) commit
+                               print "<td>" .
+                                     $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                            file_name=>$diff->{'to_file'},
+                                                            hash_base=>$hash),
+                                             -class => "list"}, esc_path($diff->{'to_file'})) .
+                                     "</td>\n";
+                       } else {
+                               print "<td>" .
+                                     esc_path($diff->{'to_file'}) .
+                                     "</td>\n";
+                       }
+
+                       if ($action eq 'commitdiff') {
+                               # link to patch
+                               $patchno++;
+                               print "<td class=\"link\">" .
+                                     $cgi->a({-href => href(-anchor=>"patch$patchno")},
+                                             "patch") .
+                                     " | " .
+                                     "</td>\n";
+                       }
+
+                       my $has_history = 0;
+                       my $not_deleted = 0;
+                       for (my $i = 0; $i < $diff->{'nparents'}; $i++) {
+                               my $hash_parent = $parents[$i];
+                               my $from_hash = $diff->{'from_id'}[$i];
+                               my $from_path = $diff->{'from_file'}[$i];
+                               my $status = $diff->{'status'}[$i];
+
+                               $has_history ||= ($status ne 'A');
+                               $not_deleted ||= ($status ne 'D');
+
+                               if ($status eq 'A') {
+                                       print "<td  class=\"link\" align=\"right\"> | </td>\n";
+                               } elsif ($status eq 'D') {
+                                       print "<td class=\"link\">" .
+                                             $cgi->a({-href => href(action=>"blob",
+                                                                    hash_base=>$hash,
+                                                                    hash=>$from_hash,
+                                                                    file_name=>$from_path)},
+                                                     "blob" . ($i+1)) .
+                                             " | </td>\n";
+                               } else {
+                                       if ($diff->{'to_id'} eq $from_hash) {
+                                               print "<td class=\"link nochange\">";
+                                       } else {
+                                               print "<td class=\"link\">";
+                                       }
+                                       print $cgi->a({-href => href(action=>"blobdiff",
+                                                                    hash=>$diff->{'to_id'},
+                                                                    hash_parent=>$from_hash,
+                                                                    hash_base=>$hash,
+                                                                    hash_parent_base=>$hash_parent,
+                                                                    file_name=>$diff->{'to_file'},
+                                                                    file_parent=>$from_path)},
+                                                     "diff" . ($i+1)) .
+                                             " | </td>\n";
+                               }
+                       }
+
+                       print "<td class=\"link\">";
+                       if ($not_deleted) {
+                               print $cgi->a({-href => href(action=>"blob",
+                                                            hash=>$diff->{'to_id'},
+                                                            file_name=>$diff->{'to_file'},
+                                                            hash_base=>$hash)},
+                                             "blob");
+                               print " | " if ($has_history);
+                       }
+                       if ($has_history) {
+                               print $cgi->a({-href => href(action=>"history",
+                                                            file_name=>$diff->{'to_file'},
+                                                            hash_base=>$hash)},
+                                             "history");
+                       }
+                       print "</td>\n";
+
+                       print "</tr>\n";
+                       next; # instead of 'else' clause, to avoid extra indent
+               }
+               # else ordinary diff
+
+               my ($to_mode_oct, $to_mode_str, $to_file_type);
+               my ($from_mode_oct, $from_mode_str, $from_file_type);
+               if ($diff->{'to_mode'} ne ('0' x 6)) {
+                       $to_mode_oct = oct $diff->{'to_mode'};
+                       if (S_ISREG($to_mode_oct)) { # only for regular file
+                               $to_mode_str = sprintf("%04o", $to_mode_oct & 0777); # permission bits
+                       }
+                       $to_file_type = file_type($diff->{'to_mode'});
+               }
+               if ($diff->{'from_mode'} ne ('0' x 6)) {
+                       $from_mode_oct = oct $diff->{'from_mode'};
+                       if (S_ISREG($from_mode_oct)) { # only for regular file
+                               $from_mode_str = sprintf("%04o", $from_mode_oct & 0777); # permission bits
+                       }
+                       $from_file_type = file_type($diff->{'from_mode'});
+               }
+
+               if ($diff->{'status'} eq "A") { # created
+                       my $mode_chng = "<span class=\"file_status new\">[new $to_file_type";
+                       $mode_chng   .= " with mode: $to_mode_str" if $to_mode_str;
+                       $mode_chng   .= "]</span>";
+                       print "<td>";
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$hash, file_name=>$diff->{'file'}),
+                                     -class => "list"}, esc_path($diff->{'file'}));
+                       print "</td>\n";
+                       print "<td>$mode_chng</td>\n";
+                       print "<td class=\"link\">";
+                       if ($action eq 'commitdiff') {
+                               # link to patch
+                               $patchno++;
+                               print $cgi->a({-href => href(-anchor=>"patch$patchno")},
+                                             "patch") .
+                                     " | ";
+                       }
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$hash, file_name=>$diff->{'file'})},
+                                     "blob");
+                       print "</td>\n";
+
+               } elsif ($diff->{'status'} eq "D") { # deleted
+                       my $mode_chng = "<span class=\"file_status deleted\">[deleted $from_file_type]</span>";
+                       print "<td>";
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'from_id'},
+                                                    hash_base=>$parent, file_name=>$diff->{'file'}),
+                                      -class => "list"}, esc_path($diff->{'file'}));
+                       print "</td>\n";
+                       print "<td>$mode_chng</td>\n";
+                       print "<td class=\"link\">";
+                       if ($action eq 'commitdiff') {
+                               # link to patch
+                               $patchno++;
+                               print $cgi->a({-href => href(-anchor=>"patch$patchno")},
+                                             "patch") .
+                                     " | ";
+                       }
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'from_id'},
+                                                    hash_base=>$parent, file_name=>$diff->{'file'})},
+                                     "blob") . " | ";
+                       if ($have_blame) {
+                               print $cgi->a({-href => href(action=>"blame", hash_base=>$parent,
+                                                            file_name=>$diff->{'file'})},
+                                             "blame") . " | ";
+                       }
+                       print $cgi->a({-href => href(action=>"history", hash_base=>$parent,
+                                                    file_name=>$diff->{'file'})},
+                                     "history");
+                       print "</td>\n";
+
+               } elsif ($diff->{'status'} eq "M" || $diff->{'status'} eq "T") { # modified, or type changed
+                       my $mode_chnge = "";
+                       if ($diff->{'from_mode'} != $diff->{'to_mode'}) {
+                               $mode_chnge = "<span class=\"file_status mode_chnge\">[changed";
+                               if ($from_file_type ne $to_file_type) {
+                                       $mode_chnge .= " from $from_file_type to $to_file_type";
+                               }
+                               if (($from_mode_oct & 0777) != ($to_mode_oct & 0777)) {
+                                       if ($from_mode_str && $to_mode_str) {
+                                               $mode_chnge .= " mode: $from_mode_str->$to_mode_str";
+                                       } elsif ($to_mode_str) {
+                                               $mode_chnge .= " mode: $to_mode_str";
+                                       }
+                               }
+                               $mode_chnge .= "]</span>\n";
+                       }
+                       print "<td>";
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$hash, file_name=>$diff->{'file'}),
+                                     -class => "list"}, esc_path($diff->{'file'}));
+                       print "</td>\n";
+                       print "<td>$mode_chnge</td>\n";
+                       print "<td class=\"link\">";
+                       if ($action eq 'commitdiff') {
+                               # link to patch
+                               $patchno++;
+                               print $cgi->a({-href => href(-anchor=>"patch$patchno")},
+                                             "patch") .
+                                     " | ";
+                       } elsif ($diff->{'to_id'} ne $diff->{'from_id'}) {
+                               # "commit" view and modified file (not onlu mode changed)
+                               print $cgi->a({-href => href(action=>"blobdiff",
+                                                            hash=>$diff->{'to_id'}, hash_parent=>$diff->{'from_id'},
+                                                            hash_base=>$hash, hash_parent_base=>$parent,
+                                                            file_name=>$diff->{'file'})},
+                                             "diff") .
+                                     " | ";
+                       }
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$hash, file_name=>$diff->{'file'})},
+                                      "blob") . " | ";
+                       if ($have_blame) {
+                               print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
+                                                            file_name=>$diff->{'file'})},
+                                             "blame") . " | ";
+                       }
+                       print $cgi->a({-href => href(action=>"history", hash_base=>$hash,
+                                                    file_name=>$diff->{'file'})},
+                                     "history");
+                       print "</td>\n";
+
+               } elsif ($diff->{'status'} eq "R" || $diff->{'status'} eq "C") { # renamed or copied
+                       my %status_name = ('R' => 'moved', 'C' => 'copied');
+                       my $nstatus = $status_name{$diff->{'status'}};
+                       my $mode_chng = "";
+                       if ($diff->{'from_mode'} != $diff->{'to_mode'}) {
+                               # mode also for directories, so we cannot use $to_mode_str
+                               $mode_chng = sprintf(", mode: %04o", $to_mode_oct & 0777);
+                       }
+                       print "<td>" .
+                             $cgi->a({-href => href(action=>"blob", hash_base=>$hash,
+                                                    hash=>$diff->{'to_id'}, file_name=>$diff->{'to_file'}),
+                                     -class => "list"}, esc_path($diff->{'to_file'})) . "</td>\n" .
+                             "<td><span class=\"file_status $nstatus\">[$nstatus from " .
+                             $cgi->a({-href => href(action=>"blob", hash_base=>$parent,
+                                                    hash=>$diff->{'from_id'}, file_name=>$diff->{'from_file'}),
+                                     -class => "list"}, esc_path($diff->{'from_file'})) .
+                             " with " . (int $diff->{'similarity'}) . "% similarity$mode_chng]</span></td>\n" .
+                             "<td class=\"link\">";
+                       if ($action eq 'commitdiff') {
+                               # link to patch
+                               $patchno++;
+                               print $cgi->a({-href => href(-anchor=>"patch$patchno")},
+                                             "patch") .
+                                     " | ";
+                       } elsif ($diff->{'to_id'} ne $diff->{'from_id'}) {
+                               # "commit" view and modified file (not only pure rename or copy)
+                               print $cgi->a({-href => href(action=>"blobdiff",
+                                                            hash=>$diff->{'to_id'}, hash_parent=>$diff->{'from_id'},
+                                                            hash_base=>$hash, hash_parent_base=>$parent,
+                                                            file_name=>$diff->{'to_file'}, file_parent=>$diff->{'from_file'})},
+                                             "diff") .
+                                     " | ";
+                       }
+                       print $cgi->a({-href => href(action=>"blob", hash=>$diff->{'to_id'},
+                                                    hash_base=>$parent, file_name=>$diff->{'to_file'})},
+                                     "blob") . " | ";
+                       if ($have_blame) {
+                               print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
+                                                            file_name=>$diff->{'to_file'})},
+                                             "blame") . " | ";
+                       }
+                       print $cgi->a({-href => href(action=>"history", hash_base=>$hash,
+                                                   file_name=>$diff->{'to_file'})},
+                                     "history");
+                       print "</td>\n";
+
+               } # we should not encounter Unmerged (U) or Unknown (X) status
+               print "</tr>\n";
+       }
+       print "</tbody>" if $has_header;
+       print "</table>\n";
+}
+
+# Print context lines and then rem/add lines in a side-by-side manner.
+sub print_sidebyside_diff_lines {
+       my ($ctx, $rem, $add) = @_;
+
+       # print context block before add/rem block
+       if (@$ctx) {
+               print join '',
+                       '<div class="chunk_block ctx">',
+                               '<div class="old">',
+                               @$ctx,
+                               '</div>',
+                               '<div class="new">',
+                               @$ctx,
+                               '</div>',
+                       '</div>';
+       }
+
+       if (!@$add) {
+               # pure removal
+               print join '',
+                       '<div class="chunk_block rem">',
+                               '<div class="old">',
+                               @$rem,
+                               '</div>',
+                       '</div>';
+       } elsif (!@$rem) {
+               # pure addition
+               print join '',
+                       '<div class="chunk_block add">',
+                               '<div class="new">',
+                               @$add,
+                               '</div>',
+                       '</div>';
+       } else {
+               print join '',
+                       '<div class="chunk_block chg">',
+                               '<div class="old">',
+                               @$rem,
+                               '</div>',
+                               '<div class="new">',
+                               @$add,
+                               '</div>',
+                       '</div>';
+       }
+}
+
+# Print context lines and then rem/add lines in inline manner.
+sub print_inline_diff_lines {
+       my ($ctx, $rem, $add) = @_;
+
+       print @$ctx, @$rem, @$add;
+}
+
+# Format removed and added line, mark changed part and HTML-format them.
+# Implementation is based on contrib/diff-highlight
+sub format_rem_add_lines_pair {
+       my ($rem, $add, $num_parents) = @_;
+
+       # We need to untabify lines before split()'ing them;
+       # otherwise offsets would be invalid.
+       chomp $rem;
+       chomp $add;
+       $rem = untabify($rem);
+       $add = untabify($add);
+
+       my @rem = split(//, $rem);
+       my @add = split(//, $add);
+       my ($esc_rem, $esc_add);
+       # Ignore leading +/- characters for each parent.
+       my ($prefix_len, $suffix_len) = ($num_parents, 0);
+       my ($prefix_has_nonspace, $suffix_has_nonspace);
+
+       my $shorter = (@rem < @add) ? @rem : @add;
+       while ($prefix_len < $shorter) {
+               last if ($rem[$prefix_len] ne $add[$prefix_len]);
+
+               $prefix_has_nonspace = 1 if ($rem[$prefix_len] !~ /\s/);
+               $prefix_len++;
+       }
+
+       while ($prefix_len + $suffix_len < $shorter) {
+               last if ($rem[-1 - $suffix_len] ne $add[-1 - $suffix_len]);
+
+               $suffix_has_nonspace = 1 if ($rem[-1 - $suffix_len] !~ /\s/);
+               $suffix_len++;
+       }
+
+       # Mark lines that are different from each other, but have some common
+       # part that isn't whitespace.  If lines are completely different, don't
+       # mark them because that would make output unreadable, especially if
+       # diff consists of multiple lines.
+       if ($prefix_has_nonspace || $suffix_has_nonspace) {
+               $esc_rem = esc_html_hl_regions($rem, 'marked',
+                       [$prefix_len, @rem - $suffix_len], -nbsp=>1);
+               $esc_add = esc_html_hl_regions($add, 'marked',
+                       [$prefix_len, @add - $suffix_len], -nbsp=>1);
+       } else {
+               $esc_rem = esc_html($rem, -nbsp=>1);
+               $esc_add = esc_html($add, -nbsp=>1);
+       }
+
+       return format_diff_line(\$esc_rem, 'rem'),
+              format_diff_line(\$esc_add, 'add');
+}
+
+# HTML-format diff context, removed and added lines.
+sub format_ctx_rem_add_lines {
+       my ($ctx, $rem, $add, $num_parents) = @_;
+       my (@new_ctx, @new_rem, @new_add);
+       my $can_highlight = 0;
+       my $is_combined = ($num_parents > 1);
+
+       # Highlight if every removed line has a corresponding added line.
+       if (@$add > 0 && @$add == @$rem) {
+               $can_highlight = 1;
+
+               # Highlight lines in combined diff only if the chunk contains
+               # diff between the same version, e.g.
+               #
+               #    - a
+               #   -  b
+               #    + c
+               #   +  d
+               #
+               # Otherwise the highlightling would be confusing.
+               if ($is_combined) {
+                       for (my $i = 0; $i < @$add; $i++) {
+                               my $prefix_rem = substr($rem->[$i], 0, $num_parents);
+                               my $prefix_add = substr($add->[$i], 0, $num_parents);
+
+                               $prefix_rem =~ s/-/+/g;
+
+                               if ($prefix_rem ne $prefix_add) {
+                                       $can_highlight = 0;
+                                       last;
+                               }
+                       }
+               }
+       }
+
+       if ($can_highlight) {
+               for (my $i = 0; $i < @$add; $i++) {
+                       my ($line_rem, $line_add) = format_rem_add_lines_pair(
+                               $rem->[$i], $add->[$i], $num_parents);
+                       push @new_rem, $line_rem;
+                       push @new_add, $line_add;
+               }
+       } else {
+               @new_rem = map { format_diff_line($_, 'rem') } @$rem;
+               @new_add = map { format_diff_line($_, 'add') } @$add;
+       }
+
+       @new_ctx = map { format_diff_line($_, 'ctx') } @$ctx;
+
+       return (\@new_ctx, \@new_rem, \@new_add);
+}
+
+# Print context lines and then rem/add lines.
+sub print_diff_lines {
+       my ($ctx, $rem, $add, $diff_style, $num_parents) = @_;
+       my $is_combined = $num_parents > 1;
+
+       ($ctx, $rem, $add) = format_ctx_rem_add_lines($ctx, $rem, $add,
+               $num_parents);
+
+       if ($diff_style eq 'sidebyside' && !$is_combined) {
+               print_sidebyside_diff_lines($ctx, $rem, $add);
+       } else {
+               # default 'inline' style and unknown styles
+               print_inline_diff_lines($ctx, $rem, $add);
+       }
+}
+
+sub print_diff_chunk {
+       my ($diff_style, $num_parents, $from, $to, @chunk) = @_;
+       my (@ctx, @rem, @add);
+
+       # The class of the previous line.
+       my $prev_class = '';
+
+       return unless @chunk;
+
+       # incomplete last line might be among removed or added lines,
+       # or both, or among context lines: find which
+       for (my $i = 1; $i < @chunk; $i++) {
+               if ($chunk[$i][0] eq 'incomplete') {
+                       $chunk[$i][0] = $chunk[$i-1][0];
+               }
+       }
+
+       # guardian
+       push @chunk, ["", ""];
+
+       foreach my $line_info (@chunk) {
+               my ($class, $line) = @$line_info;
+
+               # print chunk headers
+               if ($class && $class eq 'chunk_header') {
+                       print format_diff_line($line, $class, $from, $to);
+                       next;
+               }
+
+               ## print from accumulator when have some add/rem lines or end
+               # of chunk (flush context lines), or when have add and rem
+               # lines and new block is reached (otherwise add/rem lines could
+               # be reordered)
+               if (!$class || ((@rem || @add) && $class eq 'ctx') ||
+                   (@rem && @add && $class ne $prev_class)) {
+                       print_diff_lines(\@ctx, \@rem, \@add,
+                                        $diff_style, $num_parents);
+                       @ctx = @rem = @add = ();
+               }
+
+               ## adding lines to accumulator
+               # guardian value
+               last unless $line;
+               # rem, add or change
+               if ($class eq 'rem') {
+                       push @rem, $line;
+               } elsif ($class eq 'add') {
+                       push @add, $line;
+               }
+               # context line
+               if ($class eq 'ctx') {
+                       push @ctx, $line;
+               }
+
+               $prev_class = $class;
+       }
+}
+
+sub git_patchset_body {
+       my ($fd, $diff_style, $difftree, $hash, @hash_parents) = @_;
+       my ($hash_parent) = $hash_parents[0];
+
+       my $is_combined = (@hash_parents > 1);
+       my $patch_idx = 0;
+       my $patch_number = 0;
+       my $patch_line;
+       my $diffinfo;
+       my $to_name;
+       my (%from, %to);
+       my @chunk; # for side-by-side diff
+
+       print "<div class=\"patchset\">\n";
+
+       # skip to first patch
+       while ($patch_line = <$fd>) {
+               chomp $patch_line;
+
+               last if ($patch_line =~ m/^diff /);
+       }
+
+ PATCH:
+       while ($patch_line) {
+
+               # parse "git diff" header line
+               if ($patch_line =~ m/^diff --git (\"(?:[^\\\"]*(?:\\.[^\\\"]*)*)\"|[^ "]*) (.*)$/) {
+                       # $1 is from_name, which we do not use
+                       $to_name = unquote($2);
+                       $to_name =~ s!^b/!!;
+               } elsif ($patch_line =~ m/^diff --(cc|combined) ("?.*"?)$/) {
+                       # $1 is 'cc' or 'combined', which we do not use
+                       $to_name = unquote($2);
+               } else {
+                       $to_name = undef;
+               }
+
+               # check if current patch belong to current raw line
+               # and parse raw git-diff line if needed
+               if (is_patch_split($diffinfo, { 'to_file' => $to_name })) {
+                       # this is continuation of a split patch
+                       print "<div class=\"patch cont\">\n";
+               } else {
+                       # advance raw git-diff output if needed
+                       $patch_idx++ if defined $diffinfo;
+
+                       # read and prepare patch information
+                       $diffinfo = parsed_difftree_line($difftree->[$patch_idx]);
+
+                       # compact combined diff output can have some patches skipped
+                       # find which patch (using pathname of result) we are at now;
+                       if ($is_combined) {
+                               while ($to_name ne $diffinfo->{'to_file'}) {
+                                       print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n" .
+                                             format_diff_cc_simplified($diffinfo, @hash_parents) .
+                                             "</div>\n";  # class="patch"
+
+                                       $patch_idx++;
+                                       $patch_number++;
+
+                                       last if $patch_idx > $#$difftree;
+                                       $diffinfo = parsed_difftree_line($difftree->[$patch_idx]);
+                               }
+                       }
+
+                       # modifies %from, %to hashes
+                       parse_from_to_diffinfo($diffinfo, \%from, \%to, @hash_parents);
+
+                       # this is first patch for raw difftree line with $patch_idx index
+                       # we index @$difftree array from 0, but number patches from 1
+                       print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n";
+               }
+
+               # git diff header
+               #assert($patch_line =~ m/^diff /) if DEBUG;
+               #assert($patch_line !~ m!$/$!) if DEBUG; # is chomp-ed
+               $patch_number++;
+               # print "git diff" header
+               print format_git_diff_header_line($patch_line, $diffinfo,
+                                                 \%from, \%to);
+
+               # print extended diff header
+               print "<div class=\"diff extended_header\">\n";
+       EXTENDED_HEADER:
+               while ($patch_line = <$fd>) {
+                       chomp $patch_line;
+
+                       last EXTENDED_HEADER if ($patch_line =~ m/^--- |^diff /);
+
+                       print format_extended_diff_header_line($patch_line, $diffinfo,
+                                                              \%from, \%to);
+               }
+               print "</div>\n"; # class="diff extended_header"
+
+               # from-file/to-file diff header
+               if (! $patch_line) {
+                       print "</div>\n"; # class="patch"
+                       last PATCH;
+               }
+               next PATCH if ($patch_line =~ m/^diff /);
+               #assert($patch_line =~ m/^---/) if DEBUG;
+
+               my $last_patch_line = $patch_line;
+               $patch_line = <$fd>;
+               chomp $patch_line;
+               #assert($patch_line =~ m/^\+\+\+/) if DEBUG;
+
+               print format_diff_from_to_header($last_patch_line, $patch_line,
+                                                $diffinfo, \%from, \%to,
+                                                @hash_parents);
+
+               # the patch itself
+       LINE:
+               while ($patch_line = <$fd>) {
+                       chomp $patch_line;
+
+                       next PATCH if ($patch_line =~ m/^diff /);
+
+                       my $class = diff_line_class($patch_line, \%from, \%to);
+
+                       if ($class eq 'chunk_header') {
+                               print_diff_chunk($diff_style, scalar @hash_parents, \%from, \%to, @chunk);
+                               @chunk = ();
+                       }
+
+                       push @chunk, [ $class, $patch_line ];
+               }
+
+       } continue {
+               if (@chunk) {
+                       print_diff_chunk($diff_style, scalar @hash_parents, \%from, \%to, @chunk);
+                       @chunk = ();
+               }
+               print "</div>\n"; # class="patch"
+       }
+
+       # for compact combined (--cc) format, with chunk and patch simplification
+       # the patchset might be empty, but there might be unprocessed raw lines
+       for (++$patch_idx if $patch_number > 0;
+            $patch_idx < @$difftree;
+            ++$patch_idx) {
+               # read and prepare patch information
+               $diffinfo = parsed_difftree_line($difftree->[$patch_idx]);
+
+               # generate anchor for "patch" links in difftree / whatchanged part
+               print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n" .
+                     format_diff_cc_simplified($diffinfo, @hash_parents) .
+                     "</div>\n";  # class="patch"
+
+               $patch_number++;
+       }
+
+       if ($patch_number == 0) {
+               if (@hash_parents > 1) {
+                       print "<div class=\"diff nodifferences\">Trivial merge</div>\n";
+               } else {
+                       print "<div class=\"diff nodifferences\">No differences found</div>\n";
+               }
+       }
+
+       print "</div>\n"; # class="patchset"
+}
+
+# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+
+sub git_project_search_form {
+       my ($searchtext, $search_use_regexp) = @_;
+
+       my $limit = '';
+       if ($project_filter) {
+               $limit = " in '$project_filter/'";
+       }
+
+       print "<div class=\"projsearch\">\n";
+       print $cgi->start_form(-method => 'get', -action => $my_uri) .
+             $cgi->hidden(-name => 'a', -value => 'project_list')  . "\n";
+       print $cgi->hidden(-name => 'pf', -value => $project_filter). "\n"
+               if (defined $project_filter);
+       print $cgi->textfield(-name => 's', -value => $searchtext,
+                             -title => "Search project by name and description$limit",
+                             -size => 60) . "\n" .
+             "<span title=\"Extended regular expression\">" .
+             $cgi->checkbox(-name => 'sr', -value => 1, -label => 're',
+                            -checked => $search_use_regexp) .
+             "</span>\n" .
+             $cgi->submit(-name => 'btnS', -value => 'Search') .
+             $cgi->end_form() . "\n" .
+             $cgi->a({-href => href(project => undef, searchtext => undef,
+                                    project_filter => $project_filter)},
+                     esc_html("List all projects$limit")) . "<br />\n";
+       print "</div>\n";
+}
+
+# entry for given @keys needs filling if at least one of keys in list
+# is not present in %$project_info
+sub project_info_needs_filling {
+       my ($project_info, @keys) = @_;
+
+       # return List::MoreUtils::any { !exists $project_info->{$_} } @keys;
+       foreach my $key (@keys) {
+               if (!exists $project_info->{$key}) {
+                       return 1;
+               }
+       }
+       return;
+}
+
+# fills project list info (age, description, owner, category, forks, etc.)
+# for each project in the list, removing invalid projects from
+# returned list, or fill only specified info.
+#
+# Invalid projects are removed from the returned list if and only if you
+# ask 'age' or 'age_string' to be filled, because they are the only fields
+# that run unconditionally git command that requires repository, and
+# therefore do always check if project repository is invalid.
+#
+# USAGE:
+# * fill_project_list_info(\@project_list, 'descr_long', 'ctags')
+#   ensures that 'descr_long' and 'ctags' fields are filled
+# * @project_list = fill_project_list_info(\@project_list)
+#   ensures that all fields are filled (and invalid projects removed)
+#
+# NOTE: modifies $projlist, but does not remove entries from it
+sub fill_project_list_info {
+       my ($projlist, @wanted_keys) = @_;
+       my @projects;
+       my $filter_set = sub { return @_; };
+       if (@wanted_keys) {
+               my %wanted_keys = map { $_ => 1 } @wanted_keys;
+               $filter_set = sub { return grep { $wanted_keys{$_} } @_; };
+       }
+
+       my $show_ctags = gitweb_check_feature('ctags');
+ PROJECT:
+       foreach my $pr (@$projlist) {
+               if (project_info_needs_filling($pr, $filter_set->('age', 'age_string'))) {
+                       my (@activity) = git_get_last_activity($pr->{'path'});
+                       unless (@activity) {
+                               next PROJECT;
+                       }
+                       ($pr->{'age'}, $pr->{'age_string'}) = @activity;
+               }
+               if (project_info_needs_filling($pr, $filter_set->('descr', 'descr_long'))) {
+                       my $descr = git_get_project_description($pr->{'path'}) || "";
+                       $descr = to_utf8($descr);
+                       $pr->{'descr_long'} = $descr;
+                       $pr->{'descr'} = chop_str($descr, $projects_list_description_width, 5);
+               }
+               if (project_info_needs_filling($pr, $filter_set->('owner'))) {
+                       $pr->{'owner'} = git_get_project_owner("$pr->{'path'}") || "";
+               }
+               if ($show_ctags &&
+                   project_info_needs_filling($pr, $filter_set->('ctags'))) {
+                       $pr->{'ctags'} = git_get_project_ctags($pr->{'path'});
+               }
+               if ($projects_list_group_categories &&
+                   project_info_needs_filling($pr, $filter_set->('category'))) {
+                       my $cat = git_get_project_category($pr->{'path'}) ||
+                                                          $project_list_default_category;
+                       $pr->{'category'} = to_utf8($cat);
+               }
+
+               push @projects, $pr;
+       }
+
+       return @projects;
+}
+
+sub sort_projects_list {
+       my ($projlist, $order) = @_;
+
+       sub order_str {
+               my $key = shift;
+               return sub { $a->{$key} cmp $b->{$key} };
+       }
+
+       sub order_num_then_undef {
+               my $key = shift;
+               return sub {
+                       defined $a->{$key} ?
+                               (defined $b->{$key} ? $a->{$key} <=> $b->{$key} : -1) :
+                               (defined $b->{$key} ? 1 : 0)
+               };
+       }
+
+       my %orderings = (
+               project => order_str('path'),
+               descr => order_str('descr_long'),
+               owner => order_str('owner'),
+               age => order_num_then_undef('age'),
+       );
+
+       my $ordering = $orderings{$order};
+       return defined $ordering ? sort $ordering @$projlist : @$projlist;
+}
+
+# returns a hash of categories, containing the list of project
+# belonging to each category
+sub build_projlist_by_category {
+       my ($projlist, $from, $to) = @_;
+       my %categories;
+
+       $from = 0 unless defined $from;
+       $to = $#$projlist if (!defined $to || $#$projlist < $to);
+
+       for (my $i = $from; $i <= $to; $i++) {
+               my $pr = $projlist->[$i];
+               push @{$categories{ $pr->{'category'} }}, $pr;
+       }
+
+       return wantarray ? %categories : \%categories;
+}
+
+# print 'sort by' <th> element, generating 'sort by $name' replay link
+# if that order is not selected
+sub print_sort_th {
+       print format_sort_th(@_);
+}
+
+sub format_sort_th {
+       my ($name, $order, $header) = @_;
+       my $sort_th = "";
+       $header ||= ucfirst($name);
+
+       if ($order eq $name) {
+               $sort_th .= "<th>$header</th>\n";
+       } else {
+               $sort_th .= "<th>" .
+                           $cgi->a({-href => href(-replay=>1, order=>$name),
+                                    -class => "header"}, $header) .
+                           "</th>\n";
+       }
+
+       return $sort_th;
+}
+
+sub git_project_list_rows {
+       my ($projlist, $from, $to, $check_forks) = @_;
+
+       $from = 0 unless defined $from;
+       $to = $#$projlist if (!defined $to || $#$projlist < $to);
+
+       my $alternate = 1;
+       for (my $i = $from; $i <= $to; $i++) {
+               my $pr = $projlist->[$i];
+
+               if ($alternate) {
+                       print "<tr class=\"dark\">\n";
+               } else {
+                       print "<tr class=\"light\">\n";
+               }
+               $alternate ^= 1;
+
+               if ($check_forks) {
+                       print "<td>";
+                       if ($pr->{'forks'}) {
+                               my $nforks = scalar @{$pr->{'forks'}};
+                               if ($nforks > 0) {
+                                       print $cgi->a({-href => href(project=>$pr->{'path'}, action=>"forks"),
+                                                      -title => "$nforks forks"}, "+");
+                               } else {
+                                       print $cgi->span({-title => "$nforks forks"}, "+");
+                               }
+                       }
+                       print "</td>\n";
+               }
+               print "<td>" . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary"),
+                                       -class => "list"},
+                                      esc_html_match_hl($pr->{'path'}, $search_regexp)) .
+                     "</td>\n" .
+                     "<td>" . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary"),
+                                       -class => "list",
+                                       -title => $pr->{'descr_long'}},
+                                       $search_regexp
+                                       ? esc_html_match_hl_chopped($pr->{'descr_long'},
+                                                                   $pr->{'descr'}, $search_regexp)
+                                       : esc_html($pr->{'descr'})) .
+                     "</td>\n";
+               unless ($omit_owner) {
+                       print "<td><i>" . chop_and_escape_str($pr->{'owner'}, 15) . "</i></td>\n";
+               }
+               unless ($omit_age_column) {
+                       print "<td class=\"". age_class($pr->{'age'}) . "\">" .
+                           (defined $pr->{'age_string'} ? $pr->{'age_string'} : "No commits") . "</td>\n";
+               }
+               print"<td class=\"link\">" .
+                     $cgi->a({-href => href(project=>$pr->{'path'}, action=>"summary")}, "summary")   . " | " .
+                     $cgi->a({-href => href(project=>$pr->{'path'}, action=>"shortlog")}, "shortlog") . " | " .
+                     $cgi->a({-href => href(project=>$pr->{'path'}, action=>"log")}, "log") . " | " .
+                     $cgi->a({-href => href(project=>$pr->{'path'}, action=>"tree")}, "tree") .
+                     ($pr->{'forks'} ? " | " . $cgi->a({-href => href(project=>$pr->{'path'}, action=>"forks")}, "forks") : '') .
+                     "</td>\n" .
+                     "</tr>\n";
+       }
+}
+
+sub git_project_list_body {
+       # actually uses global variable $project
+       my ($projlist, $order, $from, $to, $extra, $no_header) = @_;
+       my @projects = @$projlist;
+
+       my $check_forks = gitweb_check_feature('forks');
+       my $show_ctags  = gitweb_check_feature('ctags');
+       my $tagfilter = $show_ctags ? $input_params{'ctag'} : undef;
+       $check_forks = undef
+               if ($tagfilter || $search_regexp);
+
+       # filtering out forks before filling info allows to do less work
+       @projects = filter_forks_from_projects_list(\@projects)
+               if ($check_forks);
+       # search_projects_list pre-fills required info
+       @projects = search_projects_list(\@projects,
+                                        'search_regexp' => $search_regexp,
+                                        'tagfilter'  => $tagfilter)
+               if ($tagfilter || $search_regexp);
+       # fill the rest
+       my @all_fields = ('descr', 'descr_long', 'ctags', 'category');
+       push @all_fields, ('age', 'age_string') unless($omit_age_column);
+       push @all_fields, 'owner' unless($omit_owner);
+       @projects = fill_project_list_info(\@projects, @all_fields);
+
+       $order ||= $default_projects_order;
+       $from = 0 unless defined $from;
+       $to = $#projects if (!defined $to || $#projects < $to);
+
+       # short circuit
+       if ($from > $to) {
+               print "<center>\n".
+                     "<b>No such projects found</b><br />\n".
+                     "Click ".$cgi->a({-href=>href(project=>undef)},"here")." to view all projects<br />\n".
+                     "</center>\n<br />\n";
+               return;
+       }
+
+       @projects = sort_projects_list(\@projects, $order);
+
+       if ($show_ctags) {
+               my $ctags = git_gather_all_ctags(\@projects);
+               my $cloud = git_populate_project_tagcloud($ctags);
+               print git_show_project_tagcloud($cloud, 64);
+       }
+
+       print "<table class=\"project_list\">\n";
+       unless ($no_header) {
+               print "<tr>\n";
+               if ($check_forks) {
+                       print "<th></th>\n";
+               }
+               print_sort_th('project', $order, 'Project');
+               print_sort_th('descr', $order, 'Description');
+               print_sort_th('owner', $order, 'Owner') unless $omit_owner;
+               print_sort_th('age', $order, 'Last Change') unless $omit_age_column;
+               print "<th></th>\n" . # for links
+                     "</tr>\n";
+       }
+
+       if ($projects_list_group_categories) {
+               # only display categories with projects in the $from-$to window
+               @projects = sort {$a->{'category'} cmp $b->{'category'}} @projects[$from..$to];
+               my %categories = build_projlist_by_category(\@projects, $from, $to);
+               foreach my $cat (sort keys %categories) {
+                       unless ($cat eq "") {
+                               print "<tr>\n";
+                               if ($check_forks) {
+                                       print "<td></td>\n";
+                               }
+                               print "<td class=\"category\" colspan=\"5\">".esc_html($cat)."</td>\n";
+                               print "</tr>\n";
+                       }
+
+                       git_project_list_rows($categories{$cat}, undef, undef, $check_forks);
+               }
+       } else {
+               git_project_list_rows(\@projects, $from, $to, $check_forks);
+       }
+
+       if (defined $extra) {
+               print "<tr>\n";
+               if ($check_forks) {
+                       print "<td></td>\n";
+               }
+               print "<td colspan=\"5\">$extra</td>\n" .
+                     "</tr>\n";
+       }
+       print "</table>\n";
+}
+
+sub git_log_body {
+       # uses global variable $project
+       my ($commitlist, $from, $to, $refs, $extra) = @_;
+
+       $from = 0 unless defined $from;
+       $to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);
+
+       for (my $i = 0; $i <= $to; $i++) {
+               my %co = %{$commitlist->[$i]};
+               next if !%co;
+               my $commit = $co{'id'};
+               my $ref = format_ref_marker($refs, $commit);
+               git_print_header_div('commit',
+                              "<span class=\"age\">$co{'age_string'}</span>" .
+                              esc_html($co{'title'}) . $ref,
+                              $commit);
+               print "<div class=\"title_text\">\n" .
+                     "<div class=\"log_link\">\n" .
+                     $cgi->a({-href => href(action=>"commit", hash=>$commit)}, "commit") .
+                     " | " .
+                     $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff") .
+                     " | " .
+                     $cgi->a({-href => href(action=>"tree", hash=>$commit, hash_base=>$commit)}, "tree") .
+                     "<br/>\n" .
+                     "</div>\n";
+                     git_print_authorship(\%co, -tag => 'span');
+                     print "<br/>\n</div>\n";
+
+               print "<div class=\"log_body\">\n";
+               git_print_log($co{'comment'}, -final_empty_line=> 1);
+               print "</div>\n";
+       }
+       if ($extra) {
+               print "<div class=\"page_nav\">\n";
+               print "$extra\n";
+               print "</div>\n";
+       }
+}
+
+sub git_shortlog_body {
+       # uses global variable $project
+       my ($commitlist, $from, $to, $refs, $extra) = @_;
+
+       $from = 0 unless defined $from;
+       $to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);
+
+       print "<table class=\"shortlog\">\n";
+       my $alternate = 1;
+       for (my $i = $from; $i <= $to; $i++) {
+               my %co = %{$commitlist->[$i]};
+               my $commit = $co{'id'};
+               my $ref = format_ref_marker($refs, $commit);
+               if ($alternate) {
+                       print "<tr class=\"dark\">\n";
+               } else {
+                       print "<tr class=\"light\">\n";
+               }
+               $alternate ^= 1;
+               # git_summary() used print "<td><i>$co{'age_string'}</i></td>\n" .
+               print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
+                     format_author_html('td', \%co, 10) . "<td>";
+               print format_subject_html($co{'title'}, $co{'title_short'},
+                                         href(action=>"commit", hash=>$commit), $ref);
+               print "</td>\n" .
+                     "<td class=\"link\">" .
+                     $cgi->a({-href => href(action=>"commit", hash=>$commit)}, "commit") . " | " .
+                     $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff") . " | " .
+                     $cgi->a({-href => href(action=>"tree", hash=>$commit, hash_base=>$commit)}, "tree");
+               my $snapshot_links = format_snapshot_links($commit);
+               if (defined $snapshot_links) {
+                       print " | " . $snapshot_links;
+               }
+               print "</td>\n" .
+                     "</tr>\n";
+       }
+       if (defined $extra) {
+               print "<tr>\n" .
+                     "<td colspan=\"4\">$extra</td>\n" .
+                     "</tr>\n";
+       }
+       print "</table>\n";
+}
+
+sub git_history_body {
+       # Warning: assumes constant type (blob or tree) during history
+       my ($commitlist, $from, $to, $refs, $extra,
+           $file_name, $file_hash, $ftype) = @_;
+
+       $from = 0 unless defined $from;
+       $to = $#{$commitlist} unless (defined $to && $to <= $#{$commitlist});
+
+       print "<table class=\"history\">\n";
+       my $alternate = 1;
+       for (my $i = $from; $i <= $to; $i++) {
+               my %co = %{$commitlist->[$i]};
+               if (!%co) {
+                       next;
+               }
+               my $commit = $co{'id'};
+
+               my $ref = format_ref_marker($refs, $commit);
+
+               if ($alternate) {
+                       print "<tr class=\"dark\">\n";
+               } else {
+                       print "<tr class=\"light\">\n";
+               }
+               $alternate ^= 1;
+               print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
+       # shortlog:   format_author_html('td', \%co, 10)
+                     format_author_html('td', \%co, 15, 3) . "<td>";
+               # originally git_history used chop_str($co{'title'}, 50)
+               print format_subject_html($co{'title'}, $co{'title_short'},
+                                         href(action=>"commit", hash=>$commit), $ref);
+               print "</td>\n" .
+                     "<td class=\"link\">" .
+                     $cgi->a({-href => href(action=>$ftype, hash_base=>$commit, file_name=>$file_name)}, $ftype) . " | " .
+                     $cgi->a({-href => href(action=>"commitdiff", hash=>$commit)}, "commitdiff");
+
+               if ($ftype eq 'blob') {
+                       my $blob_current = $file_hash;
+                       my $blob_parent  = git_get_hash_by_path($commit, $file_name);
+                       if (defined $blob_current && defined $blob_parent &&
+                                       $blob_current ne $blob_parent) {
+                               print " | " .
+                                       $cgi->a({-href => href(action=>"blobdiff",
+                                                              hash=>$blob_current, hash_parent=>$blob_parent,
+                                                              hash_base=>$hash_base, hash_parent_base=>$commit,
+                                                              file_name=>$file_name)},
+                                               "diff to current");
+                       }
+               }
+               print "</td>\n" .
+                     "</tr>\n";
+       }
+       if (defined $extra) {
+               print "<tr>\n" .
+                     "<td colspan=\"4\">$extra</td>\n" .
+                     "</tr>\n";
+       }
+       print "</table>\n";
+}
+
+sub git_tags_body {
+       # uses global variable $project
+       my ($taglist, $from, $to, $extra) = @_;
+       $from = 0 unless defined $from;
+       $to = $#{$taglist} if (!defined $to || $#{$taglist} < $to);
+
+       print "<table class=\"tags\">\n";
+       my $alternate = 1;
+       for (my $i = $from; $i <= $to; $i++) {
+               my $entry = $taglist->[$i];
+               my %tag = %$entry;
+               my $comment = $tag{'subject'};
+               my $comment_short;
+               if (defined $comment) {
+                       $comment_short = chop_str($comment, 30, 5);
+               }
+               if ($alternate) {
+                       print "<tr class=\"dark\">\n";
+               } else {
+                       print "<tr class=\"light\">\n";
+               }
+               $alternate ^= 1;
+               if (defined $tag{'age'}) {
+                       print "<td><i>$tag{'age'}</i></td>\n";
+               } else {
+                       print "<td></td>\n";
+               }
+               print "<td>" .
+                     $cgi->a({-href => href(action=>$tag{'reftype'}, hash=>$tag{'refid'}),
+                              -class => "list name"}, esc_html($tag{'name'})) .
+                     "</td>\n" .
+                     "<td>";
+               if (defined $comment) {
+                       print format_subject_html($comment, $comment_short,
+                                                 href(action=>"tag", hash=>$tag{'id'}));
+               }
+               print "</td>\n" .
+                     "<td class=\"selflink\">";
+               if ($tag{'type'} eq "tag") {
+                       print $cgi->a({-href => href(action=>"tag", hash=>$tag{'id'})}, "tag");
+               } else {
+                       print "&nbsp;";
+               }
+               print "</td>\n" .
+                     "<td class=\"link\">" . " | " .
+                     $cgi->a({-href => href(action=>$tag{'reftype'}, hash=>$tag{'refid'})}, $tag{'reftype'});
+               if ($tag{'reftype'} eq "commit") {
+                       print " | " . $cgi->a({-href => href(action=>"shortlog", hash=>$tag{'fullname'})}, "shortlog") .
+                             " | " . $cgi->a({-href => href(action=>"log", hash=>$tag{'fullname'})}, "log");
+               } elsif ($tag{'reftype'} eq "blob") {
+                       print " | " . $cgi->a({-href => href(action=>"blob_plain", hash=>$tag{'refid'})}, "raw");
+               }
+               print "</td>\n" .
+                     "</tr>";
+       }
+       if (defined $extra) {
+               print "<tr>\n" .
+                     "<td colspan=\"5\">$extra</td>\n" .
+                     "</tr>\n";
+       }
+       print "</table>\n";
+}
+
+sub git_heads_body {
+       # uses global variable $project
+       my ($headlist, $head_at, $from, $to, $extra, $default_action) = @_;
+       $from = 0 unless defined $from;
+       $to = $#{$headlist} if (!defined $to || $#{$headlist} < $to);
+       $default_action = "shortlog" unless defined $default_action;
+       print "<table class=\"heads\">\n";
+       my $alternate = 1;
+       for (my $i = $from; $i <= $to; $i++) {
+               my $entry = $headlist->[$i];
+               my %ref = %$entry;
+               my $curr = defined $head_at && $ref{'id'} eq $head_at;
+               if ($alternate) {
+                       print "<tr class=\"dark\">\n";
+               } else {
+                       print "<tr class=\"light\">\n";
+               }
+               $alternate ^= 1;
+               print "<td><i>$ref{'age'}</i></td>\n" .
+                     ($curr ? "<td class=\"current_head\">" : "<td>") .
+                     $cgi->a({-href => href(action=>$default_action, hash=>$ref{'fullname'}),
+                              -class => "list name"},esc_html($ref{'name'})) .
+                     "</td>\n" .
+                     "<td class=\"link\">" .
+                     $cgi->a({-href => href(action=>"shortlog", hash=>$ref{'fullname'})}, "shortlog") . " | " .
+                     $cgi->a({-href => href(action=>"log", hash=>$ref{'fullname'})}, "log") . " | " .
+                     $cgi->a({-href => href(action=>"tree", hash=>$ref{'fullname'}, hash_base=>$ref{'fullname'})}, "tree") .
+                     "</td>\n" .
+                     "</tr>";
+       }
+       if (defined $extra) {
+               print "<tr>\n" .
+                     "<td colspan=\"3\">$extra</td>\n" .
+                     "</tr>\n";
+       }
+       print "</table>\n";
+}
+
+# Display a single remote block
+sub git_remote_block {
+       my ($remote, $rdata, $limit, $head) = @_;
+
+       my $heads = $rdata->{'heads'};
+       my $fetch = $rdata->{'fetch'};
+       my $push = $rdata->{'push'};
+
+       my $urls_table = "<table class=\"projects_list\">\n" ;
+
+       if (defined $fetch) {
+               if ($fetch eq $push) {
+                       $urls_table .= format_repo_url("URL", $fetch);
+               } else {
+                       $urls_table .= format_repo_url("Fetch URL", $fetch);
+                       $urls_table .= format_repo_url("Push URL", $push) if defined $push;
+               }
+       } elsif (defined $push) {
+               $urls_table .= format_repo_url("Push URL", $push);
+       } else {
+               $urls_table .= format_repo_url("", "No remote URL");
+       }
+
+       $urls_table .= "</table>\n";
+
+       my $dots;
+       if (defined $limit && $limit < @$heads) {
+               $dots = $cgi->a({-href => href(action=>"remotes", hash=>$remote)}, "...");
+       }
+
+       print $urls_table;
+       git_heads_body($heads, $head, 0, $limit, $dots);
+}
+
+# Display a list of remote names with the respective fetch and push URLs
+sub git_remotes_list {
+       my ($remotedata, $limit) = @_;
+       print "<table class=\"heads\">\n";
+       my $alternate = 1;
+       my @remotes = sort keys %$remotedata;
+
+       my $limited = $limit && $limit < @remotes;
+
+       $#remotes = $limit - 1 if $limited;
+
+       while (my $remote = shift @remotes) {
+               my $rdata = $remotedata->{$remote};
+               my $fetch = $rdata->{'fetch'};
+               my $push = $rdata->{'push'};
+               if ($alternate) {
+                       print "<tr class=\"dark\">\n";
+               } else {
+                       print "<tr class=\"light\">\n";
+               }
+               $alternate ^= 1;
+               print "<td>" .
+                     $cgi->a({-href=> href(action=>'remotes', hash=>$remote),
+                              -class=> "list name"},esc_html($remote)) .
+                     "</td>";
+               print "<td class=\"link\">" .
+                     (defined $fetch ? $cgi->a({-href=> $fetch}, "fetch") : "fetch") .
+                     " | " .
+                     (defined $push ? $cgi->a({-href=> $push}, "push") : "push") .
+                     "</td>";
+
+               print "</tr>\n";
+       }
+
+       if ($limited) {
+               print "<tr>\n" .
+                     "<td colspan=\"3\">" .
+                     $cgi->a({-href => href(action=>"remotes")}, "...") .
+                     "</td>\n" . "</tr>\n";
+       }
+
+       print "</table>";
+}
+
+# Display remote heads grouped by remote, unless there are too many
+# remotes, in which case we only display the remote names
+sub git_remotes_body {
+       my ($remotedata, $limit, $head) = @_;
+       if ($limit and $limit < keys %$remotedata) {
+               git_remotes_list($remotedata, $limit);
+       } else {
+               fill_remote_heads($remotedata);
+               while (my ($remote, $rdata) = each %$remotedata) {
+                       git_print_section({-class=>"remote", -id=>$remote},
+                               ["remotes", $remote, $remote], sub {
+                                       git_remote_block($remote, $rdata, $limit, $head);
+                               });
+               }
+       }
+}
+
+sub git_search_message {
+       my %co = @_;
+
+       my $greptype;
+       if ($searchtype eq 'commit') {
+               $greptype = "--grep=";
+       } elsif ($searchtype eq 'author') {
+               $greptype = "--author=";
+       } elsif ($searchtype eq 'committer') {
+               $greptype = "--committer=";
+       }
+       $greptype .= $searchtext;
+       my @commitlist = parse_commits($hash, 101, (100 * $page), undef,
+                                      $greptype, '--regexp-ignore-case',
+                                      $search_use_regexp ? '--extended-regexp' : '--fixed-strings');
+
+       my $paging_nav = '';
+       if ($page > 0) {
+               $paging_nav .=
+                       $cgi->a({-href => href(-replay=>1, page=>undef)},
+                               "first") .
+                       " &sdot; " .
+                       $cgi->a({-href => href(-replay=>1, page=>$page-1),
+                                -accesskey => "p", -title => "Alt-p"}, "prev");
+       } else {
+               $paging_nav .= "first &sdot; prev";
+       }
+       my $next_link = '';
+       if ($#commitlist >= 100) {
+               $next_link =
+                       $cgi->a({-href => href(-replay=>1, page=>$page+1),
+                                -accesskey => "n", -title => "Alt-n"}, "next");
+               $paging_nav .= " &sdot; $next_link";
+       } else {
+               $paging_nav .= " &sdot; next";
+       }
+
+       git_header_html();
+
+       git_print_page_nav('','', $hash,$co{'tree'},$hash, $paging_nav);
+       git_print_header_div('commit', esc_html($co{'title'}), $hash);
+       if ($page == 0 && !@commitlist) {
+               print "<p>No match.</p>\n";
+       } else {
+               git_search_grep_body(\@commitlist, 0, 99, $next_link);
+       }
+
+       git_footer_html();
+}
+
+sub git_search_changes {
+       my %co = @_;
+
+       local $/ = "\n";
+       open my $fd, '-|', git_cmd(), '--no-pager', 'log', @diff_opts,
+               '--pretty=format:%H', '--no-abbrev', '--raw', "-S$searchtext",
+               ($search_use_regexp ? '--pickaxe-regex' : ())
+                       or die_error(500, "Open git-log failed");
+
+       git_header_html();
+
+       git_print_page_nav('','', $hash,$co{'tree'},$hash);
+       git_print_header_div('commit', esc_html($co{'title'}), $hash);
+
+       print "<table class=\"pickaxe search\">\n";
+       my $alternate = 1;
+       undef %co;
+       my @files;
+       while (my $line = <$fd>) {
+               chomp $line;
+               next unless $line;
+
+               my %set = parse_difftree_raw_line($line);
+               if (defined $set{'commit'}) {
+                       # finish previous commit
+                       if (%co) {
+                               print "</td>\n" .
+                                     "<td class=\"link\">" .
+                                     $cgi->a({-href => href(action=>"commit", hash=>$co{'id'})},
+                                             "commit") .
+                                     " | " .
+                                     $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'},
+                                                            hash_base=>$co{'id'})},
+                                             "tree") .
+                                     "</td>\n" .
+                                     "</tr>\n";
+                       }
+
+                       if ($alternate) {
+                               print "<tr class=\"dark\">\n";
+                       } else {
+                               print "<tr class=\"light\">\n";
+                       }
+                       $alternate ^= 1;
+                       %co = parse_commit($set{'commit'});
+                       my $author = chop_and_escape_str($co{'author_name'}, 15, 5);
+                       print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
+                             "<td><i>$author</i></td>\n" .
+                             "<td>" .
+                             $cgi->a({-href => href(action=>"commit", hash=>$co{'id'}),
+                                     -class => "list subject"},
+                                     chop_and_escape_str($co{'title'}, 50) . "<br/>");
+               } elsif (defined $set{'to_id'}) {
+                       next if ($set{'to_id'} =~ m/^0{40}$/);
+
+                       print $cgi->a({-href => href(action=>"blob", hash_base=>$co{'id'},
+                                                    hash=>$set{'to_id'}, file_name=>$set{'to_file'}),
+                                     -class => "list"},
+                                     "<span class=\"match\">" . esc_path($set{'file'}) . "</span>") .
+                             "<br/>\n";
+               }
+       }
+       close $fd;
+
+       # finish last commit (warning: repetition!)
+       if (%co) {
+               print "</td>\n" .
+                     "<td class=\"link\">" .
+                     $cgi->a({-href => href(action=>"commit", hash=>$co{'id'})},
+                             "commit") .
+                     " | " .
+                     $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'},
+                                            hash_base=>$co{'id'})},
+                             "tree") .
+                     "</td>\n" .
+                     "</tr>\n";
+       }
+
+       print "</table>\n";
+
+       git_footer_html();
+}
+
+sub git_search_files {
+       my %co = @_;
+
+       local $/ = "\n";
+       open my $fd, "-|", git_cmd(), 'grep', '-n', '-z',
+               $search_use_regexp ? ('-E', '-i') : '-F',
+               $searchtext, $co{'tree'}
+                       or die_error(500, "Open git-grep failed");
+
+       git_header_html();
+
+       git_print_page_nav('','', $hash,$co{'tree'},$hash);
+       git_print_header_div('commit', esc_html($co{'title'}), $hash);
+
+       print "<table class=\"grep_search\">\n";
+       my $alternate = 1;
+       my $matches = 0;
+       my $lastfile = '';
+       my $file_href;
+       while (my $line = <$fd>) {
+               chomp $line;
+               my ($file, $lno, $ltext, $binary);
+               last if ($matches++ > 1000);
+               if ($line =~ /^Binary file (.+) matches$/) {
+                       $file = $1;
+                       $binary = 1;
+               } else {
+                       ($file, $lno, $ltext) = split(/\0/, $line, 3);
+                       $file =~ s/^$co{'tree'}://;
+               }
+               if ($file ne $lastfile) {
+                       $lastfile and print "</td></tr>\n";
+                       if ($alternate++) {
+                               print "<tr class=\"dark\">\n";
+                       } else {
+                               print "<tr class=\"light\">\n";
+                       }
+                       $file_href = href(action=>"blob", hash_base=>$co{'id'},
+                                         file_name=>$file);
+                       print "<td class=\"list\">".
+                               $cgi->a({-href => $file_href, -class => "list"}, esc_path($file));
+                       print "</td><td>\n";
+                       $lastfile = $file;
+               }
+               if ($binary) {
+                       print "<div class=\"binary\">Binary file</div>\n";
+               } else {
+                       $ltext = untabify($ltext);
+                       if ($ltext =~ m/^(.*)($search_regexp)(.*)$/i) {
+                               $ltext = esc_html($1, -nbsp=>1);
+                               $ltext .= '<span class="match">';
+                               $ltext .= esc_html($2, -nbsp=>1);
+                               $ltext .= '</span>';
+                               $ltext .= esc_html($3, -nbsp=>1);
+                       } else {
+                               $ltext = esc_html($ltext, -nbsp=>1);
+                       }
+                       print "<div class=\"pre\">" .
+                               $cgi->a({-href => $file_href.'#l'.$lno,
+                                       -class => "linenr"}, sprintf('%4i', $lno)) .
+                               ' ' .  $ltext . "</div>\n";
+               }
+       }
+       if ($lastfile) {
+               print "</td></tr>\n";
+               if ($matches > 1000) {
+                       print "<div class=\"diff nodifferences\">Too many matches, listing trimmed</div>\n";
+               }
+       } else {
+               print "<div class=\"diff nodifferences\">No matches found</div>\n";
+       }
+       close $fd;
+
+       print "</table>\n";
+
+       git_footer_html();
+}
+
+sub git_search_grep_body {
+       my ($commitlist, $from, $to, $extra) = @_;
+       $from = 0 unless defined $from;
+       $to = $#{$commitlist} if (!defined $to || $#{$commitlist} < $to);
+
+       print "<table class=\"commit_search\">\n";
+       my $alternate = 1;
+       for (my $i = $from; $i <= $to; $i++) {
+               my %co = %{$commitlist->[$i]};
+               if (!%co) {
+                       next;
+               }
+               my $commit = $co{'id'};
+               if ($alternate) {
+                       print "<tr class=\"dark\">\n";
+               } else {
+                       print "<tr class=\"light\">\n";
+               }
+               $alternate ^= 1;
+               print "<td title=\"$co{'age_string_age'}\"><i>$co{'age_string_date'}</i></td>\n" .
+                     format_author_html('td', \%co, 15, 5) .
+                     "<td>" .
+                     $cgi->a({-href => href(action=>"commit", hash=>$co{'id'}),
+                              -class => "list subject"},
+                             chop_and_escape_str($co{'title'}, 50) . "<br/>");
+               my $comment = $co{'comment'};
+               foreach my $line (@$comment) {
+                       if ($line =~ m/^(.*?)($search_regexp)(.*)$/i) {
+                               my ($lead, $match, $trail) = ($1, $2, $3);
+                               $match = chop_str($match, 70, 5, 'center');
+                               my $contextlen = int((80 - length($match))/2);
+                               $contextlen = 30 if ($contextlen > 30);
+                               $lead  = chop_str($lead,  $contextlen, 10, 'left');
+                               $trail = chop_str($trail, $contextlen, 10, 'right');
+
+                               $lead  = esc_html($lead);
+                               $match = esc_html($match);
+                               $trail = esc_html($trail);
+
+                               print "$lead<span class=\"match\">$match</span>$trail<br />";
+                       }
+               }
+               print "</td>\n" .
+                     "<td class=\"link\">" .
+                     $cgi->a({-href => href(action=>"commit", hash=>$co{'id'})}, "commit") .
+                     " | " .
+                     $cgi->a({-href => href(action=>"commitdiff", hash=>$co{'id'})}, "commitdiff") .
+                     " | " .
+                     $cgi->a({-href => href(action=>"tree", hash=>$co{'tree'}, hash_base=>$co{'id'})}, "tree");
+               print "</td>\n" .
+                     "</tr>\n";
+       }
+       if (defined $extra) {
+               print "<tr>\n" .
+                     "<td colspan=\"3\">$extra</td>\n" .
+                     "</tr>\n";
+       }
+       print "</table>\n";
+}
+
+## ======================================================================
+## ======================================================================
+## actions
+
+sub git_project_list {
+       my $order = $input_params{'order'};
+       if (defined $order && $order !~ m/none|project|descr|owner|age/) {
+               die_error(400, "Unknown order parameter");
+       }
+
+       my @list = git_get_projects_list($project_filter, $strict_export);
+       if (!@list) {
+               die_error(404, "No projects found");
+       }
+
+       git_header_html();
+       if (defined $home_text && -f $home_text) {
+               print "<div class=\"index_include\">\n";
+               insert_file($home_text);
+               print "</div>\n";
+       }
+
+       git_project_search_form($searchtext, $search_use_regexp);
+       git_project_list_body(\@list, $order);
+       git_footer_html();
+}
+
+sub git_forks {
+       my $order = $input_params{'order'};
+       if (defined $order && $order !~ m/none|project|descr|owner|age/) {
+               die_error(400, "Unknown order parameter");
+       }
+
+       my $filter = $project;
+       $filter =~ s/\.git$//;
+       my @list = git_get_projects_list($filter);
+       if (!@list) {
+               die_error(404, "No forks found");
+       }
+
+       git_header_html();
+       git_print_page_nav('','');
+       git_print_header_div('summary', "$project forks");
+       git_project_list_body(\@list, $order);
+       git_footer_html();
+}
+
+sub git_project_index {
+       my @projects = git_get_projects_list($project_filter, $strict_export);
+       if (!@projects) {
+               die_error(404, "No projects found");
+       }
+
+       print $cgi->header(
+               -type => 'text/plain',
+               -charset => 'utf-8',
+               -content_disposition => 'inline; filename="index.aux"');
+
+       foreach my $pr (@projects) {
+               if (!exists $pr->{'owner'}) {
+                       $pr->{'owner'} = git_get_project_owner("$pr->{'path'}");
+               }
+
+               my ($path, $owner) = ($pr->{'path'}, $pr->{'owner'});
+               # quote as in CGI::Util::encode, but keep the slash, and use '+' for ' '
+               $path  =~ s/([^a-zA-Z0-9_.\-\/ ])/sprintf("%%%02X", ord($1))/eg;
+               $owner =~ s/([^a-zA-Z0-9_.\-\/ ])/sprintf("%%%02X", ord($1))/eg;
+               $path  =~ s/ /\+/g;
+               $owner =~ s/ /\+/g;
+
+               print "$path $owner\n";
+       }
+}
+
+sub git_summary {
+       my $descr = git_get_project_description($project) || "none";
+       my %co = parse_commit("HEAD");
+       my %cd = %co ? parse_date($co{'committer_epoch'}, $co{'committer_tz'}) : ();
+       my $head = $co{'id'};
+       my $remote_heads = gitweb_check_feature('remote_heads');
+
+       my $owner = git_get_project_owner($project);
+
+       my $refs = git_get_references();
+       # These get_*_list functions return one more to allow us to see if
+       # there are more ...
+       my @taglist  = git_get_tags_list(16);
+       my @headlist = git_get_heads_list(16);
+       my %remotedata = $remote_heads ? git_get_remotes_list() : ();
+       my @forklist;
+       my $check_forks = gitweb_check_feature('forks');
+
+       if ($check_forks) {
+               # find forks of a project
+               my $filter = $project;
+               $filter =~ s/\.git$//;
+               @forklist = git_get_projects_list($filter);
+               # filter out forks of forks
+               @forklist = filter_forks_from_projects_list(\@forklist)
+                       if (@forklist);
+       }
+
+       git_header_html();
+       git_print_page_nav('summary','', $head);
+
+       print "<div class=\"title\">&nbsp;</div>\n";
+       print "<table class=\"projects_list\">\n" .
+             "<tr id=\"metadata_desc\"><td>description</td><td>" . esc_html($descr) . "</td></tr>\n";
+        if ($owner and not $omit_owner) {
+               print  "<tr id=\"metadata_owner\"><td>owner</td><td>" . esc_html($owner) . "</td></tr>\n";
+        }
+       if (defined $cd{'rfc2822'}) {
+               print "<tr id=\"metadata_lchange\"><td>last change</td>" .
+                     "<td>".format_timestamp_html(\%cd)."</td></tr>\n";
+       }
+
+       # use per project git URL list in $projectroot/$project/cloneurl
+       # or make project git URL from git base URL and project name
+       my $url_tag = "URL";
+       my @url_list = git_get_project_url_list($project);
+       @url_list = map { "$_/$project" } @git_base_url_list unless @url_list;
+       foreach my $git_url (@url_list) {
+               next unless $git_url;
+               print format_repo_url($url_tag, $git_url);
+               $url_tag = "";
+       }
+
+       # Tag cloud
+       my $show_ctags = gitweb_check_feature('ctags');
+       if ($show_ctags) {
+               my $ctags = git_get_project_ctags($project);
+               if (%$ctags) {
+                       # without ability to add tags, don't show if there are none
+                       my $cloud = git_populate_project_tagcloud($ctags);
+                       print "<tr id=\"metadata_ctags\">" .
+                             "<td>content tags</td>" .
+                             "<td>".git_show_project_tagcloud($cloud, 48)."</td>" .
+                             "</tr>\n";
+               }
+       }
+
+       print "</table>\n";
+
+       # If XSS prevention is on, we don't include README.html.
+       # TODO: Allow a readme in some safe format.
+       if (!$prevent_xss && -s "$projectroot/$project/README.html") {
+               print "<div class=\"title\">readme</div>\n" .
+                     "<div class=\"readme\">\n";
+               insert_file("$projectroot/$project/README.html");
+               print "\n</div>\n"; # class="readme"
+       }
+
+       # we need to request one more than 16 (0..15) to check if
+       # those 16 are all
+       my @commitlist = $head ? parse_commits($head, 17) : ();
+       if (@commitlist) {
+               git_print_header_div('shortlog');
+               git_shortlog_body(\@commitlist, 0, 15, $refs,
+                                 $#commitlist <=  15 ? undef :
+                                 $cgi->a({-href => href(action=>"shortlog")}, "..."));
+       }
+
+       if (@taglist) {
+               git_print_header_div('tags');
+               git_tags_body(\@taglist, 0, 15,
+                             $#taglist <=  15 ? undef :
+                             $cgi->a({-href => href(action=>"tags")}, "..."));
+       }
+
+       if (@headlist) {
+               git_print_header_div('heads');
+               git_heads_body(\@headlist, $head, 0, 15,
+                              $#headlist <= 15 ? undef :
+                              $cgi->a({-href => href(action=>"heads")}, "..."));
+       }
+
+       if (%remotedata) {
+               git_print_header_div('remotes');
+               git_remotes_body(\%remotedata, 15, $head);
+       }
+
+       if (@forklist) {
+               git_print_header_div('forks');
+               git_project_list_body(\@forklist, 'age', 0, 15,
+                                     $#forklist <= 15 ? undef :
+                                     $cgi->a({-href => href(action=>"forks")}, "..."),
+                                     'no_header');
+       }
+
+       git_footer_html();
+}
+
+sub git_tag {
+       my %tag = parse_tag($hash);
+
+       if (! %tag) {
+               die_error(404, "Unknown tag object");
+       }
+
+       my $head = git_get_head_hash($project);
+       git_header_html();
+       git_print_page_nav('','', $head,undef,$head);
+       git_print_header_div('commit', esc_html($tag{'name'}), $hash);
+       print "<div class=\"title_text\">\n" .
+             "<table class=\"object_header\">\n" .
+             "<tr>\n" .
+             "<td>object</td>\n" .
+             "<td>" . $cgi->a({-class => "list", -href => href(action=>$tag{'type'}, hash=>$tag{'object'})},
+                              $tag{'object'}) . "</td>\n" .
+             "<td class=\"link\">" . $cgi->a({-href => href(action=>$tag{'type'}, hash=>$tag{'object'})},
+                                             $tag{'type'}) . "</td>\n" .
+             "</tr>\n";
+       if (defined($tag{'author'})) {
+               git_print_authorship_rows(\%tag, 'author');
+       }
+       print "</table>\n\n" .
+             "</div>\n";
+       print "<div class=\"page_body\">";
+       my $comment = $tag{'comment'};
+       foreach my $line (@$comment) {
+               chomp $line;
+               print esc_html($line, -nbsp=>1) . "<br/>\n";
+       }
+       print "</div>\n";
+       git_footer_html();
+}
+
+sub git_blame_common {
+       my $format = shift || 'porcelain';
+       if ($format eq 'porcelain' && $input_params{'javascript'}) {
+               $format = 'incremental';
+               $action = 'blame_incremental'; # for page title etc
+       }
+
+       # permissions
+       gitweb_check_feature('blame')
+               or die_error(403, "Blame view not allowed");
+
+       # error checking
+       die_error(400, "No file name given") unless $file_name;
+       $hash_base ||= git_get_head_hash($project);
+       die_error(404, "Couldn't find base commit") unless $hash_base;
+       my %co = parse_commit($hash_base)
+               or die_error(404, "Commit not found");
+       my $ftype = "blob";
+       if (!defined $hash) {
+               $hash = git_get_hash_by_path($hash_base, $file_name, "blob")
+                       or die_error(404, "Error looking up file");
+       } else {
+               $ftype = git_get_type($hash);
+               if ($ftype !~ "blob") {
+                       die_error(400, "Object is not a blob");
+               }
+       }
+
+       my $fd;
+       if ($format eq 'incremental') {
+               # get file contents (as base)
+               open $fd, "-|", git_cmd(), 'cat-file', 'blob', $hash
+                       or die_error(500, "Open git-cat-file failed");
+       } elsif ($format eq 'data') {
+               # run git-blame --incremental
+               open $fd, "-|", git_cmd(), "blame", "--incremental",
+                       $hash_base, "--", $file_name
+                       or die_error(500, "Open git-blame --incremental failed");
+       } else {
+               # run git-blame --porcelain
+               open $fd, "-|", git_cmd(), "blame", '-p',
+                       $hash_base, '--', $file_name
+                       or die_error(500, "Open git-blame --porcelain failed");
+       }
+       binmode $fd, ':utf8';
+
+       # incremental blame data returns early
+       if ($format eq 'data') {
+               print $cgi->header(
+                       -type=>"text/plain", -charset => "utf-8",
+                       -status=> "200 OK");
+               local $| = 1; # output autoflush
+               while (my $line = <$fd>) {
+                       print to_utf8($line);
+               }
+               close $fd
+                       or print "ERROR $!\n";
+
+               print 'END';
+               if (defined $t0 && gitweb_check_feature('timed')) {
+                       print ' '.
+                             tv_interval($t0, [ gettimeofday() ]).
+                             ' '.$number_of_git_cmds;
+               }
+               print "\n";
+
+               return;
+       }
+
+       # page header
+       git_header_html();
+       my $formats_nav =
+               $cgi->a({-href => href(action=>"blob", -replay=>1)},
+                       "blob") .
+               " | ";
+       if ($format eq 'incremental') {
+               $formats_nav .=
+                       $cgi->a({-href => href(action=>"blame", javascript=>0, -replay=>1)},
+                               "blame") . " (non-incremental)";
+       } else {
+               $formats_nav .=
+                       $cgi->a({-href => href(action=>"blame_incremental", -replay=>1)},
+                               "blame") . " (incremental)";
+       }
+       $formats_nav .=
+               " | " .
+               $cgi->a({-href => href(action=>"history", -replay=>1)},
+                       "history") .
+               " | " .
+               $cgi->a({-href => href(action=>$action, file_name=>$file_name)},
+                       "HEAD");
+       git_print_page_nav('','', $hash_base,$co{'tree'},$hash_base, $formats_nav);
+       git_print_header_div('commit', esc_html($co{'title'}), $hash_base);
+       git_print_page_path($file_name, $ftype, $hash_base);
+
+       # page body
+       if ($format eq 'incremental') {
+               print "<noscript>\n<div class=\"error\"><center><b>\n".
+                     "This page requires JavaScript to run.\n Use ".
+                     $cgi->a({-href => href(action=>'blame',javascript=>0,-replay=>1)},
+                             'this page').
+                     " instead.\n".
+                     "</b></center></div>\n</noscript>\n";
+
+               print qq!<div id="progress_bar" style="width: 100%; background-color: yellow"></div>\n!;
+       }
+
+       print qq!<div class="page_body">\n!;
+       print qq!<div id="progress_info">... / ...</div>\n!
+               if ($format eq 'incremental');
+       print qq!<table id="blame_table" class="blame" width="100%">\n!.
+             #qq!<col width="5.5em" /><col width="2.5em" /><col width="*" />\n!.
+             qq!<thead>\n!.
+             qq!<tr><th>Commit</th><th>Line</th><th>Data</th></tr>\n!.
+             qq!</thead>\n!.
+             qq!<tbody>\n!;
+
+       my @rev_color = qw(light dark);
+       my $num_colors = scalar(@rev_color);
+       my $current_color = 0;
+
+       if ($format eq 'incremental') {
+               my $color_class = $rev_color[$current_color];
+
+               #contents of a file
+               my $linenr = 0;
+       LINE:
+               while (my $line = <$fd>) {
+                       chomp $line;
+                       $linenr++;
+
+                       print qq!<tr id="l$linenr" class="$color_class">!.
+                             qq!<td class="sha1"><a href=""> </a></td>!.
+                             qq!<td class="linenr">!.
+                             qq!<a class="linenr" href="">$linenr</a></td>!;
+                       print qq!<td class="pre">! . esc_html($line) . "</td>\n";
+                       print qq!</tr>\n!;
+               }
+
+       } else { # porcelain, i.e. ordinary blame
+               my %metainfo = (); # saves information about commits
+
+               # blame data
+       LINE:
+               while (my $line = <$fd>) {
+                       chomp $line;
+                       # the header: <SHA-1> <src lineno> <dst lineno> [<lines in group>]
+                       # no <lines in group> for subsequent lines in group of lines
+                       my ($full_rev, $orig_lineno, $lineno, $group_size) =
+                          ($line =~ /^([0-9a-f]{40}) (\d+) (\d+)(?: (\d+))?$/);
+                       if (!exists $metainfo{$full_rev}) {
+                               $metainfo{$full_rev} = { 'nprevious' => 0 };
+                       }
+                       my $meta = $metainfo{$full_rev};
+                       my $data;
+                       while ($data = <$fd>) {
+                               chomp $data;
+                               last if ($data =~ s/^\t//); # contents of line
+                               if ($data =~ /^(\S+)(?: (.*))?$/) {
+                                       $meta->{$1} = $2 unless exists $meta->{$1};
+                               }
+                               if ($data =~ /^previous /) {
+                                       $meta->{'nprevious'}++;
+                               }
+                       }
+                       my $short_rev = substr($full_rev, 0, 8);
+                       my $author = $meta->{'author'};
+                       my %date =
+                               parse_date($meta->{'author-time'}, $meta->{'author-tz'});
+                       my $date = $date{'iso-tz'};
+                       if ($group_size) {
+                               $current_color = ($current_color + 1) % $num_colors;
+                       }
+                       my $tr_class = $rev_color[$current_color];
+                       $tr_class .= ' boundary' if (exists $meta->{'boundary'});
+                       $tr_class .= ' no-previous' if ($meta->{'nprevious'} == 0);
+                       $tr_class .= ' multiple-previous' if ($meta->{'nprevious'} > 1);
+                       print "<tr id=\"l$lineno\" class=\"$tr_class\">\n";
+                       if ($group_size) {
+                               print "<td class=\"sha1\"";
+                               print " title=\"". esc_html($author) . ", $date\"";
+                               print " rowspan=\"$group_size\"" if ($group_size > 1);
+                               print ">";
+                               print $cgi->a({-href => href(action=>"commit",
+                                                            hash=>$full_rev,
+                                                            file_name=>$file_name)},
+                                             esc_html($short_rev));
+                               if ($group_size >= 2) {
+                                       my @author_initials = ($author =~ /\b([[:upper:]])\B/g);
+                                       if (@author_initials) {
+                                               print "<br />" .
+                                                     esc_html(join('', @author_initials));
+                                               #           or join('.', ...)
+                                       }
+                               }
+                               print "</td>\n";
+                       }
+                       # 'previous' <sha1 of parent commit> <filename at commit>
+                       if (exists $meta->{'previous'} &&
+                           $meta->{'previous'} =~ /^([a-fA-F0-9]{40}) (.*)$/) {
+                               $meta->{'parent'} = $1;
+                               $meta->{'file_parent'} = unquote($2);
+                       }
+                       my $linenr_commit =
+                               exists($meta->{'parent'}) ?
+                               $meta->{'parent'} : $full_rev;
+                       my $linenr_filename =
+                               exists($meta->{'file_parent'}) ?
+                               $meta->{'file_parent'} : unquote($meta->{'filename'});
+                       my $blamed = href(action => 'blame',
+                                         file_name => $linenr_filename,
+                                         hash_base => $linenr_commit);
+                       print "<td class=\"linenr\">";
+                       print $cgi->a({ -href => "$blamed#l$orig_lineno",
+                                       -class => "linenr" },
+                                     esc_html($lineno));
+                       print "</td>";
+                       print "<td class=\"pre\">" . esc_html($data) . "</td>\n";
+                       print "</tr>\n";
+               } # end while
+
+       }
+
+       # footer
+       print "</tbody>\n".
+             "</table>\n"; # class="blame"
+       print "</div>\n";   # class="blame_body"
+       close $fd
+               or print "Reading blob failed\n";
+
+       git_footer_html();
+}
+
+sub git_blame {
+       git_blame_common();
+}
+
+sub git_blame_incremental {
+       git_blame_common('incremental');
+}
+
+sub git_blame_data {
+       git_blame_common('data');
+}
+
+sub git_tags {
+       my $head = git_get_head_hash($project);
+       git_header_html();
+       git_print_page_nav('','', $head,undef,$head,format_ref_views('tags'));
+       git_print_header_div('summary', $project);
+
+       my @tagslist = git_get_tags_list();
+       if (@tagslist) {
+               git_tags_body(\@tagslist);
+       }
+       git_footer_html();
+}
+
+sub git_heads {
+       my $head = git_get_head_hash($project);
+       git_header_html();
+       git_print_page_nav('','', $head,undef,$head,format_ref_views('heads'));
+       git_print_header_div('summary', $project);
+
+       my @headslist = git_get_heads_list();
+       if (@headslist) {
+               git_heads_body(\@headslist, $head);
+       }
+       git_footer_html();
+}
+
+# used both for single remote view and for list of all the remotes
+sub git_remotes {
+       gitweb_check_feature('remote_heads')
+               or die_error(403, "Remote heads view is disabled");
+
+       my $head = git_get_head_hash($project);
+       my $remote = $input_params{'hash'};
+
+       my $remotedata = git_get_remotes_list($remote);
+       die_error(500, "Unable to get remote information") unless defined $remotedata;
+
+       unless (%$remotedata) {
+               die_error(404, defined $remote ?
+                       "Remote $remote not found" :
+                       "No remotes found");
+       }
+
+       git_header_html(undef, undef, -action_extra => $remote);
+       git_print_page_nav('', '',  $head, undef, $head,
+               format_ref_views($remote ? '' : 'remotes'));
+
+       fill_remote_heads($remotedata);
+       if (defined $remote) {
+               git_print_header_div('remotes', "$remote remote for $project");
+               git_remote_block($remote, $remotedata->{$remote}, undef, $head);
+       } else {
+               git_print_header_div('summary', "$project remotes");
+               git_remotes_body($remotedata, undef, $head);
+       }
+
+       git_footer_html();
+}
+
+sub git_blob_plain {
+       my $type = shift;
+       my $expires;
+
+       if (!defined $hash) {
+               if (defined $file_name) {
+                       my $base = $hash_base || git_get_head_hash($project);
+                       $hash = git_get_hash_by_path($base, $file_name, "blob")
+                               or die_error(404, "Cannot find file");
+               } else {
+                       die_error(400, "No file name defined");
+               }
+       } elsif ($hash =~ m/^[0-9a-fA-F]{40}$/) {
+               # blobs defined by non-textual hash id's can be cached
+               $expires = "+1d";
+       }
+
+       open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
+               or die_error(500, "Open git-cat-file blob '$hash' failed");
+
+       # content-type (can include charset)
+       $type = blob_contenttype($fd, $file_name, $type);
+
+       # "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';
+       }
+
+       # With XSS prevention on, blobs of all types except a few known safe
+       # ones are served with "Content-Disposition: attachment" to make sure
+       # they don't run in our security domain.  For certain image types,
+       # blob view writes an <img> tag referring to blob_plain view, and we
+       # want to be sure not to break that by serving the image as an
+       # attachment (though Firefox 3 doesn't seem to care).
+       my $sandbox = $prevent_xss &&
+               $type !~ m!^(?:text/[a-z]+|image/(?:gif|png|jpeg))(?:[ ;]|$)!;
+
+       # serve text/* as text/plain
+       if ($prevent_xss &&
+           ($type =~ m!^text/[a-z]+\b(.*)$! ||
+            ($type =~ m!^[a-z]+/[a-z]\+xml\b(.*)$! && -T $fd))) {
+               my $rest = $1;
+               $rest = defined $rest ? $rest : '';
+               $type = "text/plain$rest";
+       }
+
+       print $cgi->header(
+               -type => $type,
+               -expires => $expires,
+               -content_disposition =>
+                       ($sandbox ? 'attachment' : 'inline')
+                       . '; filename="' . $save_as . '"');
+       local $/ = undef;
+       binmode STDOUT, ':raw';
+       print <$fd>;
+       binmode STDOUT, ':utf8'; # as set at the beginning of gitweb.cgi
+       close $fd;
+}
+
+sub git_blob {
+       my $expires;
+
+       if (!defined $hash) {
+               if (defined $file_name) {
+                       my $base = $hash_base || git_get_head_hash($project);
+                       $hash = git_get_hash_by_path($base, $file_name, "blob")
+                               or die_error(404, "Cannot find file");
+               } else {
+                       die_error(400, "No file name defined");
+               }
+       } elsif ($hash =~ m/^[0-9a-fA-F]{40}$/) {
+               # blobs defined by non-textual hash id's can be cached
+               $expires = "+1d";
+       }
+
+       my $have_blame = gitweb_check_feature('blame');
+       open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash
+               or die_error(500, "Couldn't cat $file_name, $hash");
+       my $mimetype = blob_mimetype($fd, $file_name);
+       # use 'blob_plain' (aka 'raw') view for files that cannot be displayed
+       if ($mimetype !~ m!^(?:text/|image/(?:gif|png|jpeg)$)! && -B $fd) {
+               close $fd;
+               return git_blob_plain($mimetype);
+       }
+       # we can have blame only for text/* mimetype
+       $have_blame &&= ($mimetype =~ m!^text/!);
+
+       my $highlight = gitweb_check_feature('highlight');
+       my $syntax = guess_file_syntax($highlight, $mimetype, $file_name);
+       $fd = run_highlighter($fd, $highlight, $syntax);
+
+       git_header_html(undef, $expires);
+       my $formats_nav = '';
+       if (defined $hash_base && (my %co = parse_commit($hash_base))) {
+               if (defined $file_name) {
+                       if ($have_blame) {
+                               $formats_nav .=
+                                       $cgi->a({-href => href(action=>"blame", -replay=>1)},
+                                               "blame") .
+                                       " | ";
+                       }
+                       $formats_nav .=
+                               $cgi->a({-href => href(action=>"history", -replay=>1)},
+                                       "history") .
+                               " | " .
+                               $cgi->a({-href => href(action=>"blob_plain", -replay=>1)},
+        &nbs